CN112282938B

CN112282938B - Centerbody assembly for a gas turbine engine

Info

Publication number: CN112282938B
Application number: CN202011172777.8A
Authority: CN
Inventors: 黄啸; 高华; 张飞; 王石柱
Original assignee: Shanghai Shangshi Energy Technology Co ltd
Current assignee: Shanghai Shangshi Aeroengine Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-05-28
Anticipated expiration: 2040-10-28
Also published as: CN112282938A

Abstract

The invention belongs to the technical field of aeroengine manufacturing, and particularly relates to a central body assembly of a gas turbine engine, which comprises a central body and a mechanical connector, wherein the central body is provided with a plurality of grooves; the central body is made by the following method: step 1: coating a layer of ceramic substrate in the conical cylindrical mold; step 2: laying a ceramic fiber net on a ceramic substrate; and step 3: coating a layer of ceramic substrate on the ceramic fiber net again; step 4; heating and curing; and 5: demoulding to obtain a central body blank; step 6: polishing and finishing, and processing a connecting hole; and 7: sintering to obtain the central body; the mechanical connector includes a ring assembly formed by splicing a plurality of connecting members. Firstly, a plurality of connecting components are arranged into a ring by adopting splicing equipment and are pressed on a transition structure, namely an inner supporting ring and an outer supporting ring, then the connecting components are pressed on a central body by utilizing pressing equipment, and the mutual positioning of the connecting components is realized before the connecting components are arranged on the central body, so that the assembly precision is improved.

Description

Centerbody assembly for a gas turbine engine

Technical Field

The invention belongs to the technical field of aeroengine manufacturing, and particularly relates to a center body assembly of a gas turbine engine.

Background

The gas turbine engine is mainly used in the field of aerospace, and the working principle of the gas turbine engine is that air is pressurized by a gas compressor, and high-pressure air and fuel are mixed and ignited and then are ejected backwards to provide thrust; the tail of a gas turbine engine is generally provided with a tail cone (also called a centerbody) which is used for guiding the air flow at the tail of the engine; in order to reduce the weight of the engine, the prior art sometimes adopts a lightweight ceramic material to manufacture the tail cone, which presents a new technical problem, namely how to ensure the reliable connection between the central body and the front end structure, and in order to solve the technical problem, the inventor of the present application sets a metal connecting piece at the front end of the ceramic central body, when in installation, the metal connecting piece is firstly connected with the central body, and then the metal connecting piece is connected with the front end structure, however, there are many problems in the assembling process of the metal connecting piece and the central body, for example: in order to avoid the influence of the internal stress generated when the metal connecting piece is heated and expanded on the strength of the ceramic structure, the connecting piece is required to be set into a multi-section structure, and expansion joints are arranged between the adjacent connecting pieces, the assembly precision of the multi-section connecting piece is difficult to guarantee when the multi-section connecting piece is assembled in the ceramic central body, the ceramic central body is easy to damage in the assembly process, in addition, the smooth connection between the ceramic central body and the front end structure is required to be ensured so as to reduce the air resistance, and the assembly tool in the prior art is difficult to.

Disclosure of Invention

It is an object of the present invention to provide a centerbody assembly for a gas turbine engine that facilitates assembly between ceramic and metallic materials and ensures assembly accuracy.

The technical scheme adopted by the invention is as follows:

a centerbody assembly for a gas turbine engine includes a conically shaped centerbody made of a ceramic material and a mechanical connector disposed at a forward end of the centerbody; the central body is made by the following method:

step 1: coating a layer of ceramic substrate in the conical cylindrical mold;

step 2: laying a ceramic fiber net on the ceramic substrate coated in the step 1;

and step 3: coating a layer of ceramic substrate on the ceramic fiber net laid in the step 2 again to wrap the ceramic fiber net in the ceramic substrate;

step 4; heating the conical barrel-shaped mould, and drying and curing the ceramic substrate;

and 5: separating the cured ceramic substrate from the conical cylindrical mold to obtain a central body blank;

step 6: polishing and finishing the inner and outer surfaces of the central body blank; and a connecting hole is processed at the front end edge of the central body blank;

and 7: feeding the central body blank into a heating furnace for sintering to obtain the central body;

the mechanical connector comprises an annular assembly formed by splicing a plurality of connecting members along the circumferential direction of the central body, and overlapping parts are arranged between the adjacent connecting members; the connecting member comprises a first arc-shaped wall and a second arc-shaped wall, the first arc-shaped wall and the second arc-shaped wall are connected into a saddle-shaped integrated structure through an elastic body, a connecting hole is formed in the first arc-shaped wall, the first arc-shaped wall is attached to the inner wall of the central body, the second arc-shaped wall is attached to the outer wall of the central body, the elastic body is arranged opposite to the end face of the central body, and a gap is formed between the elastic body and the end face of;

the connecting members are spliced into the annular assembly by splicing equipment and attached to the inner support ring and the outer support ring, the inner support ring is used for supporting the first arc-shaped wall of each connecting member, and the outer support ring is used for supporting the second arc-shaped wall of each connecting member; the hoisting equipment hoists the inner support ring and the outer support ring from the splicing equipment to the press-fitting equipment, and the press-fitting equipment presses the annular assembly at the front end of the central body and separates the annular assembly from the inner support ring and the outer support ring.

The splicing equipment comprises a base, wherein a guide ring is arranged on the base, the guide ring is movably arranged along the axis direction of the base, a first arc-shaped wall and a second arc-shaped wall of each connecting member are respectively attached to the inner ring surface and the outer ring surface of the guide ring, an elastic body of each connecting member spans the end part of the guide ring, and a plurality of connecting members are distributed along the circumferential direction of the guide ring; the adjusting mechanism comprises movable pins, the axis direction of the movable pins is arranged along the radial direction of the guide ring, the movable pins are arranged along the circumferential direction of the guide ring in a sliding manner, the movable pins and the connecting holes in the first arc-shaped wall form detachable insertion fit, and the adjusting mechanism further comprises distance adjusting units for driving the movable pins to be arranged at equal intervals; the distance adjusting unit comprises a compression ring, the compression ring is movably arranged along the axial direction of the guide ring, a plurality of insert blocks are arranged at intervals at one end of the compression ring at equal intervals along the circumferential direction, the insert blocks are arranged in a protruding mode towards one end of the compression ring along the axial direction of the compression ring, a positioning groove for positioning the circumferential position of each movable pin is formed by a gap between every two adjacent insert blocks, chamfers are arranged on two sides of a groove opening of each positioning groove, and the end faces of the insert blocks are distributed in a step-shaped mode along the; during positioning, one of the movable pins is taken as a reference to draw the rest movable pins close to the reference movable pin, then the insert block with the longest protruding distance is aligned with the reference movable pin and the gap between the adjacent movable pins, then the compression ring is driven to gradually draw close to each movable pin along the axial direction, and at the moment, each insert block can gradually and equidistantly space each movable pin from the reference movable pin under the guidance of the chamfer; the inner support ring is detachably arranged on the inner annular surface of the first expansion part, the outer support ring is detachably arranged on the outer annular surface of the second expansion part, inner slope guide surfaces which are mutually butted are arranged at the end parts of the first expansion part and the inner support ring, and outer slope guide surfaces which are mutually butted are arranged at the end parts of the second expansion part and the outer support ring; the connecting component is characterized by further comprising a pressing ring which is arranged in an opening and closing mode along the axial direction of the guide ring and forms an opening and closing mode with the guide ring, when the pressing ring approaches the guide ring, the elastic body of the connecting component can be clamped, when the pressing ring continuously presses the guide ring towards the direction of the guide ring, the guide ring and the connecting component can be driven to move towards the first expansion part and the second expansion part, at the moment, the first arc-shaped wall of the connecting component slides to the inner ring surface of the inner support ring under the guide of the inner slope guide surface, and the second arc-shaped wall slides to the outer ring surface of the outer support ring under the guide of the outer slope; when splicing, firstly, a plurality of connecting components are sequentially placed on the guide ring, and the movable pins are correspondingly spliced in the connecting holes of the connecting components one by one; and then, taking one movable pin as a reference to draw other movable pins close to the movable pin so as to ensure that adjacent connecting members are overlapped in sequence, driving a pressing ring to draw close to each movable pin, gradually and equidistantly spacing each movable pin from the reference movable pin, moving out the movable pins from the connecting holes after all the movable pins are distributed at equal intervals, driving a pressing ring to press downwards, firstly clamping the connecting members by the pressing ring, then driving a guide ring and the connecting members to move downwards, so that a first arc-shaped wall of the connecting member slides to the inner annular surface of the inner supporting ring, and a second arc-shaped wall slides to the outer annular surface of the outer supporting ring.

Ribbed plates are arranged on the inner ring surface of the inner support ring and the outer ring surface of the outer support ring, the plate surfaces of the ribbed plates are vertical to the axes of the inner support ring and the outer support ring, a discharging rod for driving the inner support ring and the outer support ring to be separated from the base is arranged on the base, one end of the discharging rod is blocked and connected with the ribbed plates of the inner support ring and the outer support ring, the other end of the discharging rod is fixedly connected with a discharging plate, and the discharging plate is fixedly connected with a piston rod of a first piston cylinder; a reset ejector rod is further arranged on the discharging plate and is in blocking connection with one end face, far away from the pressing ring, of the guide ring; after the connecting component is pressed on the inner supporting ring and the outer supporting ring, the first piston cylinder drives the discharging rod to move, and the discharging rod jacks up the inner supporting ring and the outer supporting ring so as to facilitate the hoisting mechanism to hoist.

The movable pin is arranged on the sliding block in a sliding mode along the axial direction of the movable pin, the sliding block is arranged on a circular ring-shaped track in a sliding mode, and the track is fixed on the base; the movable pin is provided with a first station and a second station relative to the sliding block, can protrude into the connecting hole of the connecting component when positioned at the first station, and can be drawn out from the connecting hole when positioned at the second station; a first elastic unit is arranged between the movable pin and the sliding block, the first elastic unit is assembled to enable the elastic force of the first elastic unit to drive the movable pin to move from the first station to the second station, the movable pin can be assembled to move from the second station to the first station in a manual pressing mode, a locking mechanism is further arranged between the movable pin and the sliding block, and the locking mechanism is assembled to enable the movable pin at the first station to be kept at the first station and to enable the movable pin to be released from the first station; the locking mechanism comprises a clamping groove arranged on the movable pin and a clamping plate which is connected with the sliding block in a sliding mode along the radial direction of the movable pin, a convex hole is formed in the clamping plate and comprises a first hole area and a second hole area, the width of one hole area is larger than that of the second hole area, the width of the first hole area is larger than that of the section of the movable pin, and the width of the second hole area is smaller than that of the section of the movable pin and larger than that of the clamping groove area on the movable pin; a second elastic unit is arranged between the clamping plate and the sliding block, when the movable pin is positioned at the first station, the clamping plate is flush with the clamping groove, and the clamping plate can enable the second hole area to be clamped in the clamping groove under the action of the second elastic unit; the movable pin can be maintained at the first station by aligning the movable pin with the connection hole when the connection member is placed and then pressing the movable pin to the first station.

The unlocking unit comprises a pressing plate which is movably arranged along the axial direction of the guide ring, and the pressing plate is in blocking connection with the clamping plate on the sliding block along the axial direction of the guide ring, so that all the movable pins can be simultaneously pulled out from the connecting holes by driving the pressing plate to press down after the movable pins are distributed at equal intervals.

The pressing plate is fixedly connected with the pressing ring, and the pressing plate is contacted with the clamping plate only after all the movable pins are positioned by the insert blocks on the pressing ring; the pressing plate is movably connected with the pressing ring along the circumferential direction, a third elastic unit is arranged between the pressing plate and the pressing ring, the third elastic unit is assembled to enable the elastic force of the third elastic unit to drive the pressing plate to move downwards relative to the pressing ring, and the pressing ring is fixedly connected with a piston rod of the second piston cylinder; the base is provided with a limiting table in blocking connection with the pressing plate; an inner ring groove for avoiding the movable pin is arranged on the inner ring surface of the guide ring; the two ends of the connecting member are respectively provided with an extending part for overlapping with the adjacent connecting member, the thickness of the extending part is smaller than that of the connecting member, the extending part at one end is flush with the outer wall of the connecting member, and the extending part at the other end is flush with the inner wall of the connecting member.

An inner retainer ring in sliding fit with the inner support ring along the axial direction of the inner support ring is arranged on the inner ring surface of the inner support ring, an outer retainer ring in sliding fit with the outer support ring along the axial direction of the outer support ring is arranged on the outer ring surface of the outer support ring, the inner retainer ring is in blocking connection with the end surface of the first arc-shaped wall, and the outer retainer ring is in blocking connection with the end surface of the second arc-shaped wall.

The press mounting equipment comprises a supporting seat for supporting the central body, wherein a tapered hole which is consistent with the outline of the outer wall of the central body is arranged on the supporting seat, the front end of the central body is upwards arranged on the supporting seat, the supporting seat is arranged on a base through a hydraulic prop, an outer limiting seat which is in blocking connection with the edge of an outer retainer ring is arranged above the supporting seat, the outer limiting seat is fixedly connected with the supporting seat, a vertical upright post is arranged on the base, a detachable inner limiting seat is arranged at the upper end of the vertical upright post, and the edge of the inner limiting seat is in blocking; a first annular pressing block and a second annular pressing block are arranged above the central body, an inner guide pillar is arranged on a rib plate of the inner support ring, the inner guide pillar penetrates through the inner check ring, an outer guide pillar is arranged on a rib plate of the outer support ring, the outer guide pillar penetrates through the outer check ring, the first annular pressing block is connected with the upper end of the inner guide pillar in a blocking mode, the second annular pressing block is connected with the upper end of the outer guide pillar in a blocking mode, the first annular pressing block and the second annular pressing block are installed on a lifting plate, and the lifting plate is fixedly connected with a piston rod of; during press mounting, firstly, the central body is hung on the supporting seat, the vertical upright post penetrates through the central body, then the inner limiting seat is installed on the vertical upright post, the inner supporting ring and the outer supporting ring are hung above the central body, the inner retainer ring is connected with the inner limiting seat in a blocking manner, and the outer retainer ring is connected with the outer limiting seat in a blocking manner; then the lifting plate is driven to move downwards, at the moment, the first annular pressing block and the second annular pressing block respectively press the inner supporting ring and the outer supporting ring downwards, the first arc-shaped wall and the second arc-shaped wall of the connecting component are blocked by the inner retaining ring and the outer retaining ring, so that the original height can be kept, the inner supporting ring is separated from the first arc-shaped wall, the outer supporting ring is separated from the second arc-shaped wall, and the first arc-shaped wall and the second arc-shaped wall are respectively and elastically clamped on two sides of the central body.

The inner retainer ring is provided with at least two first positioning grooves, the inner limiting seat is provided with at least two first positioning pins, and the first positioning pins are matched with the first positioning grooves to realize circumferential positioning between the inner retainer ring and the inner limiting seat; the outer retaining ring is provided with at least two second positioning grooves, the outer limiting seat is provided with at least two second positioning pins, and the second positioning pins are matched with the second positioning grooves to realize circumferential positioning between the outer retaining ring and the outer limiting seat.

A third positioning pin and a fourth positioning pin which are respectively matched with the first positioning groove and the second positioning groove are arranged on the base; the inner support ring and the inner retainer ring are formed by splicing at least two arc-shaped sections which are detachably connected.

The invention has the technical effects that: according to the invention, the splicing equipment is adopted to arrange the connecting members into a ring and press the ring on the transition structure, namely the inner support ring and the outer support ring, then the press-fitting equipment is utilized to press the connecting members on the central body, and the positioning between the connecting members is realized before the connecting members are arranged on the central body.

Drawings

FIG. 1 is a perspective view of a centerbody assembly provided by an embodiment of the present invention;

FIG. 2 is a perspective view of a connecting member provided by an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a centerbody assembly provided by an embodiment of the present invention;

FIG. 4 is a perspective view of a splice state of the connection members provided by an embodiment of the present invention;

FIG. 5 is an exploded view of FIG. 4;

FIG. 6 is a perspective view of a splicing apparatus provided by an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a splicing apparatus provided by an embodiment of the present invention;

FIG. 8 is an enlarged partial view of I of FIG. 7;

FIG. 9 is a perspective view of an adjustment mechanism provided by an embodiment of the present invention;

FIG. 10 is an assembly view of the pressure ring, clamp plate and clamping ring provided by an embodiment of the present invention;

FIG. 11 is an assembly view of a movable pin provided in accordance with an embodiment of the present invention, with the slide block shown in cutaway;

FIG. 12 is a cross-sectional view of a locking mechanism provided by an embodiment of the present invention;

fig. 13 is a perspective view of a press-fitting apparatus provided by an embodiment of the present invention;

fig. 14 is a cross-sectional view of a press-fitting apparatus provided by an embodiment of the present invention;

fig. 15 is a partial enlarged view II of fig. 14.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.

Example 1

A gas turbine engine central body assembly system, as shown in fig. 1-3, the central body 10 is a cone-shaped cylindrical structure made of ceramic material, the front end of the central body 10 is provided with a metal connector, the metal connector comprises an annular assembly formed by splicing a plurality of connecting members 11 along the circumference of the central body 10; the connecting member 11 comprises a first arc-shaped wall 111 and a second arc-shaped wall 112, the first arc-shaped wall 111 and the second arc-shaped wall 112 are connected into a saddle-shaped integrated structure through an elastic body 113, a connecting hole is formed in the first arc-shaped wall 111, the first arc-shaped wall 111 is attached to the inner wall of the central body 10, the second arc-shaped wall 112 is attached to the outer wall of the central body 10, the elastic body 113 is arranged opposite to the end face of the central body 10, and a gap is formed between the elastic body 113 and the end face; the assembly system comprises an inner support ring 12 and an outer support ring 13, the inner support ring 12 being adapted to support a first arcuate wall 111 of each connecting member 11, the outer support ring 13 being adapted to support a second arcuate wall 112 of each connecting member 11; further comprising a splicing means for arranging a plurality of the connecting members 11 in an annular assembly at equal intervals and press-fitting the annular assembly on the inner support ring 12 and the outer support ring 13, and a press-fitting means for press-fitting the annular assembly on the inner support ring 12 and the outer support ring 13 on the front end of the central body 10. The distance between the first arc wall 111 and the second arc wall 112 is smaller than the thickness of the central body 10 when the connection member 11 is in a free state, so that the first arc wall 111 and the second arc wall 112 can clamp the wall surface of the central body 10 after the connection member 11 is mounted on the central body 10, and the adjacent connection members 11 have an overlapping portion, if the connection members 11 are mounted one by one, the position of the other connection member 11 needs to be adjusted when the last connection member 11 is mounted, and the first arc wall 111 and the second arc wall 112 need to be opened at a larger angle to avoid the arched portion of the elastic body 113 during mounting, so that the elastic force of the elastic body 113 can be easily lost; according to the invention, the plurality of connecting members 11 are arranged into a ring by adopting splicing equipment and are pressed on a transition structure, namely the inner supporting ring 12 and the outer supporting ring 13, then the connecting members 11 are pressed on the central body 10 by utilizing the pressing equipment, and the mutual positioning of the connecting members 11 is realized before the connecting members 11 are arranged on the central body 10, because the orientation of the connecting members 11 and the central body 10 does not need to be adjusted on the central body 10 when the connecting members 11 and the central body 10 are assembled, the phenomenon that the surfaces of the central body 10 are scratched due to relative sliding between the connecting members 11 and the central body 10 in the installation process is avoided, and meanwhile, the difficulty in the assembly operation is greatly.

Further, as shown in fig. 4 and 5, an inner retainer ring 14 which is in sliding fit with the inner support ring 12 along the axial direction of the inner support ring 12 is arranged on the inner circumferential surface of the inner support ring 12, an outer retainer ring 15 which is in sliding fit with the outer support ring 13 along the axial direction of the outer support ring 13 is arranged on the outer circumferential surface of the outer support ring 13, the inner retainer ring 14 is in blocking connection with the end surface of the first arc-shaped wall 111, and the outer retainer ring 15 is in blocking connection with the end surface of the second arc-shaped wall 112. The elastic body 113 is to realize seamless connection between the central body 10 and the front end structure when the central body 10 and the front end structure are assembled, and the elastic body 113 needs a certain shrinkage allowance during assembly, so the elastic body 113 cannot be abutted against the end surface of the central body 10; for this purpose, the invention provides an inner collar 14 and an outer collar 15, both of which provide a reference for the connecting element 11 during the assembly of the connecting element 11 with the central body 10, the positions of the inner collar 14 and the outer collar 15 with respect to the central body 10 being fixed in order to determine the mounting position of the connecting element 11.

Preferably, as shown in fig. 13, 14, and 15, the press-fitting device includes a supporting seat 62 for supporting the central body 10, the supporting seat 62 is provided with a tapered hole having a contour identical to that of the outer wall of the central body 10, the front end of the central body 10 is upward mounted on the supporting seat 62, the supporting seat 62 is mounted on a base 60 through a hydraulic prop 61, an outer limit seat 65 blocked with the edge of the outer retainer ring 15 is provided above the supporting seat 62, the outer limit seat 65 is fixedly connected with the supporting seat 62, the base 60 is provided with a vertical upright post 63, the upper end of the vertical upright post 63 is provided with a detachable inner limit seat 64, and the edge of the inner limit seat 64 is blocked with the edge; a first annular pressing block 71 and a second annular pressing block 72 are arranged above the central body 10, rib plates are arranged on the inner annular surface of the inner support ring 12 and the outer annular surface of the outer support ring 13, the plate surfaces of the rib plates are perpendicular to the axial lines of the inner support ring 12 and the outer support ring 13, an inner guide post 121 is arranged on the rib plate of the inner support ring 12, the inner guide post 121 penetrates through the inner retainer ring 14, an outer guide post 131 is arranged on the rib plate of the outer support ring 13, the outer guide post 131 penetrates through the outer retainer ring 15, the first annular pressing block 71 is connected with the upper end of the inner guide post 121 in a blocking manner, the second annular pressing block 72 is connected with the upper end of the outer guide post 131 in a blocking manner, the first annular pressing block 71 and the second annular pressing block 72 are arranged on. During press mounting, firstly, the inner limiting seat 64 is removed so that the central body 10 can be sleeved on the vertical upright posts 63, the supporting seat 62 positions and supports the central body 10 from the outside, the inner limiting seat 64 is installed on the vertical upright posts 63 after the central body 10 is installed in place, then an assembly formed by the connecting member 11, the inner supporting ring 12, the outer supporting ring 13, the inner retainer ring 14 and the outer retainer ring 15 is placed on the inner limiting seat 64 and the outer limiting seat 65, the inner retainer ring 14 is in blocking connection with the inner limiting seat 64, the outer retainer ring 15 is in blocking connection with the outer limiting seat 65, the relative positions of the connecting member 11 and the central body 10 are determined, then the first annular pressing block 71 and the second annular pressing block 72 are driven to press downwards, the inner supporting ring 12 and the outer supporting ring 13 are pulled out of the connecting member 11, and after the inner supporting ring 12 and the outer supporting ring 13 are separated from the connecting member 11, the first arc-shaped wall 111 and the second arc-shaped wall 112 can clamp the wall of the central body 10 under the action of the elastic body 113, the attachment between the connecting member 11 and the central body 10 is then obtained by applying rivets at the location of the attachment holes.

Further, as shown in fig. 4, 13, 15. The inner retainer ring 14 is provided with at least two first positioning grooves 141, the inner limit seat 64 is provided with at least two first positioning pins 641, and the first positioning pins 641 and the first positioning grooves 141 are matched to realize circumferential positioning between the inner retainer ring 14 and the inner limit seat 64; the outer retainer ring 15 is provided with at least two second positioning grooves 151, the outer limiting seat 65 is provided with at least two second positioning pins 651, and the second positioning pins 651 are matched with the second positioning grooves 151 to realize circumferential positioning between the outer retainer ring 15 and the outer limiting seat 65.

Preferably, as shown in fig. 6, 7 and 8, the splicing apparatus includes a base 40, a guide ring 20 is disposed on the base 40, the guide ring 20 is movably disposed along an axial direction thereof, a first arc-shaped wall 111 and a second arc-shaped wall 112 of the connecting member 11 are respectively attached to inner and outer circumferential surfaces of the guide ring 20, an elastic body 113 of the connecting member 11 is disposed across an end portion of the guide ring 20, and the plurality of connecting members 11 are arranged along a circumferential direction of the guide ring 20; the adjusting mechanism comprises movable pins 30, the axis direction of the movable pins 30 is arranged along the radial direction of the guide ring 20, the movable pins 30 are arranged along the circumferential direction of the guide ring 20 in a sliding manner, the movable pins 30 and the connecting holes in the first arc-shaped wall 111 form a detachable plug-in fit, and the adjusting mechanism further comprises distance adjusting units for driving the movable pins 30 to be arranged at equal intervals; the distance adjusting unit comprises a pressing ring 31, the pressing ring 31 is axially and movably arranged along the guide ring 20, a plurality of inserting blocks 311 are arranged at one end of the pressing ring 31 at equal intervals along the circumferential direction, the inserting blocks 311 protrude towards one end of the pressing ring 31 along the axial direction of the pressing ring 31, a positioning groove for positioning the circumferential position of each movable pin 30 is formed by a gap between every two adjacent inserting blocks 311, chamfers are arranged on two sides of a groove opening of each positioning groove, and the end faces of the inserting blocks 311 are distributed in a step shape along the circumferential direction of the pressing ring 31; during positioning, one of the movable pins 30 is taken as a reference to draw the rest of the movable pins 30 close to the reference movable pin 30, then the insert block 311 with the longest protruding distance is aligned with the reference movable pin 30 and the gap between the adjacent movable pins 30, and then the pressing ring 31 is driven to gradually draw close to each movable pin 30 along the axial direction, and at the moment, each insert block 311 can gradually and equidistantly separate each movable pin 30 from the reference movable pin 30 under the guidance of the chamfer; the inner support ring further comprises a first expansion part 41 attached to the inner annular surface of the guide ring 20 and a second expansion part 42 attached to the outer annular surface of the guide ring 20, the first expansion part 41 and the second expansion part 42 are both cylindrical and fixedly connected with the base 40, the inner support ring 12 is detachably mounted on the inner annular surface of the first expansion part 41, the outer support ring 13 is detachably mounted on the outer annular surface of the second expansion part 42, inner slope guide surfaces which are mutually butted are arranged at the end parts of the first expansion part 41 and the inner support ring 12, and outer slope guide surfaces which are mutually butted are arranged at the end parts of the second expansion part 42 and the outer support ring 13; the connecting device also comprises a pressing ring 21 which forms an opening and closing arrangement with the guide ring 20 along the axial direction of the guide ring 20, an elastic body 113 which can clamp the connecting member 11 when the pressing ring 21 approaches the guide ring 20, and the pressing ring 21 can drive the guide ring 20 and the connecting member 11 to move towards the first expansion part 41 and the second expansion part 42 when continuously pressing the guide ring 20 towards the direction of the guide ring 20, wherein the first arc-shaped wall 111 of the connecting member 11 slides to the inner annular surface of the inner support ring 12 under the guidance of the inner slope guide surface, and the second arc-shaped wall 112 slides to the outer annular surface of the outer support ring 13 under the guidance of the outer slope guide surface; the device further comprises a hoisting mechanism for hoisting the inner support ring 12 and the outer support ring 13 from the splicing equipment to the press-fitting equipment.

Specifically, in the splicing process, the connecting members 11 are placed on the guide ring 20 one by one, the movable pins 30 are inserted into the connecting members 11 one by one, and the distance between the connecting members 11 is adjusted by adjusting the distance between the movable pins 30; the connecting hole on the connecting component 11 is a flat hole, and the movable pin 30 is a flat shaft corresponding to the flat hole, so that the connecting component 11 and the movable pin 30 cannot rotate relatively; the principle of distance adjustment is as follows: firstly, the movable pins 30 are mutually closed, wherein the closing does not mean that the movable pins 30 are completely closed without intervals, but means that expansion joints between the connecting members 11 are completely closed, and because the width of the expansion joints is smaller, the movable pins 30 are distributed in a circular shape even if being mutually closed, and only the intervals between two movable pins 30 are gathered to the width of all the expansion joints, so that the distance is far, and the installation of the last connecting member 11 is convenient; in the actual operation process, one of the movable pins 30 can be directly fixed in the circumferential direction relative to the guide ring 20, the other movable pins 30 are all closed towards the movable pin 30, after the movable pins 30 are closed, the pressing ring 31 moves downwards, in the process, the insert block 311 with the longest protruding distance firstly positions the movable pin 30 adjacent to the fixed movable pin 30, and then positions the movable pins 30 adjacent to the fixed movable pin 30 by taking the positioned movable pin 30 as a reference in sequence to finally realize the positioning of all the movable pins 30. After the movable pin 30 is positioned, the pressing ring 21 presses each connecting member 11, then the movable pin 30 is pulled out from the connecting hole of the connecting member 11, and the pressing ring 21 is pressed downwards continuously, so that the first arc-shaped wall 111 and the second arc-shaped wall 112 of the connecting member 11 slide onto the inner supporting ring 12 and the outer supporting ring 13 respectively. In the subsequent press-fitting equipment, in order to facilitate the separation of the inner support ring 12 and the outer support ring 13 from the central body 10, the outer diameter of the inner support ring 12 is smaller than the inner diameter of the central body 10, the inner diameter of the outer support ring 13 is larger than the outer diameter of the central body 10, and the inner diameter and the outer diameter of the guide ring 20 of the splicing equipment are matched with the size of the connecting member 11 in a free state, so the thickness of the guide ring is obviously smaller than the thickness of the central body 10, therefore, the invention needs to arrange a first expansion part 41 between the inner support ring 12 and the guide ring 20, and arrange a second expansion part 42 between the outer support ring 13 and the guide ring 20, so as to realize the sliding of the first arc-shaped wall 111 and the second arc-shaped wall 112 from the guide ring 20 to.

Further, as shown in fig. 7 and 8, a discharging rod 51 for driving the inner support ring 12 and the outer support ring 13 to separate from the base 40 is arranged on the base 40, one end of the discharging rod 51 is blocked and connected with the rib plate of the inner support ring 12 and the outer support ring 13, the other end of the discharging rod 51 is fixedly connected with a discharging plate 50, and the discharging plate 50 is fixedly connected with a piston rod of a first piston cylinder; the discharging plate 50 is also provided with a reset mandril 52, the reset mandril 52 is blocked and connected with one end surface of the guide ring 20 far away from the pressing ring 21, and a spring or a damper can be arranged between the guide ring 20 and the base 40 so as to clamp the guide ring 20 and the pressing ring 21 and simultaneously prevent the guide ring 20 from descending due to gravity.

Specifically, as shown in fig. 9, 11 and 12, the movable pin 30 is slidably disposed on a sliding block 33 along its own axial direction, the sliding block 33 is slidably disposed on a circular track 34, and the track 34 is fixed on a base 40; the movable pin 30 has a first position and a second position relative to the slider 33, and can be protruded into the connecting hole of the connecting member 11 when the movable pin 30 is located at the first position, and can be extracted from the connecting hole when the movable pin 30 is located at the second position; a first elastic unit 35 is arranged between the movable pin 30 and the sliding block 33, the first elastic unit 35 is assembled to enable the elastic force of the first elastic unit to drive the movable pin 30 to move from the first station to the second station, the movable pin 30 is assembled to be capable of moving from the second station to the first station in a manual pressing mode, a locking mechanism is further arranged between the movable pin 30 and the sliding block 33, and the locking mechanism is assembled to enable the movable pin 30 at the first station to be kept at the first station and the movable pin 30 to be released from the first station; the locking mechanism comprises a clamping groove 301 arranged on the movable pin 30 and a clamping plate 36 connected with the sliding block 33 in a sliding manner along the radial direction of the movable pin 30, wherein a convex hole is formed in the clamping plate 36, the convex hole comprises a first hole area and a second hole area, the width of one hole area is larger than that of the second hole area, the width of the first hole area is larger than that of the section of the movable pin 30, and the width of the second hole area is smaller than that of the section of the movable pin 30 and larger than that of the clamping groove 301 area on the movable pin 30; be equipped with second elastic element 37 between cardboard 36 and the slider 33, cardboard 36 and draw-in groove 301 parallel and level when activity round pin 30 is in first station, cardboard 36 can make the second hole region card establish with draw-in groove 301 under the effect of second elastic element 37 this moment.

Further, the unlocking unit is used for driving the locking mechanism to release the movable pin 30 at the first station, and comprises a pressing plate 32 movably arranged along the axial direction of the guide ring 20, and the pressing plate 32 is in blocking contact with a clamping plate 36 on the sliding block 33 along the axial direction of the guide ring 20. The invention realizes the synchronous drawing-off of all the movable pins 30 by the pressing of the pressing plate 32, thereby improving the working efficiency.

Preferably, as shown in fig. 6, 7 and 10, the pressing plate 32 is fixedly connected to the pressing ring 31, and the pressing plate 32 is contacted with the clamping plate 36 only after the insertion blocks 311 on the pressing ring 31 position all the movable pins 30; the pressing plate 32 is movably connected with the pressing ring 21 along the circumferential direction, a third elastic unit 211 is arranged between the pressing plate 32 and the pressing ring 21, the third elastic unit 211 is assembled to enable the elastic force of the third elastic unit 211 to drive the pressing plate 32 to move downwards relative to the pressing ring 21, and the pressing ring 21 is fixedly connected with a piston rod of a second piston cylinder; a limiting table 45 in blocking connection with the pressing plate 32 is arranged on the base 40; an inner ring groove for avoiding the movable pin 30 is arranged on the inner ring surface of the guide ring 20; the two ends of the connecting member 11 are respectively provided with an extending part 114 for overlapping with the adjacent connecting member 11, the thickness of the extending part 114 is smaller than that of the connecting member 11, and the extending part 114 at one end is flush with the outer wall of the connecting member 11, and the extending part 114 at the other end is flush with the inner wall of the connecting member 11.

Further, a third positioning pin 43 and a fourth positioning pin 44 which are respectively matched with the first positioning groove 141 and the second positioning groove 151 are arranged on the base 40; the inner support ring 12 and the inner retainer ring 14 are formed by splicing at least two arc-shaped sections which are detachably connected, and after the connecting member 11 is pressed on the central body 10, the inner support ring 12 and the inner retainer ring 14 are split into a plurality of arc-shaped sections so as to be taken out from the central body 10.

Example 2

1-3, a centerbody assembly for a gas turbine engine includes a conically shaped centerbody 10 made of a ceramic material and a mechanical connection provided at a forward end of the centerbody 10; the central body 10 is made by the following method:

step 1: coating a layer of ceramic substrate in the conical cylindrical mold;

and 5: separating the cured ceramic substrate from the conical cylindrical mold to obtain a central body 10 blank;

step 6: the inner and outer surfaces of the blank of the central body 10 are finished by grinding; and a connecting hole is processed at the front end edge of the central body 10 blank;

and 7: feeding the blank of the central body 10 into a heating furnace for sintering to obtain the central body 10;

the mechanical connector comprises an annular assembly formed by splicing a plurality of connecting members 11 along the circumference of the central body 10, and the adjacent connecting members 11 have overlapping parts; the connecting member 11 comprises a first arc-shaped wall 111 and a second arc-shaped wall 112, the first arc-shaped wall 111 and the second arc-shaped wall 112 are connected into a saddle-shaped integrated structure through an elastic body 113, a connecting hole is formed in the first arc-shaped wall 111, the first arc-shaped wall 111 is attached to the inner wall of the central body 10, the second arc-shaped wall 112 is attached to the outer wall of the central body 10, the elastic body 113 is arranged opposite to the end face of the central body 10, and a gap is formed between the elastic body 113 and the end face;

the connecting members 11 are spliced into the annular assembly by the splicing equipment described in embodiment 1 and attached to the inner support ring 12 and the outer support ring 13, the inner support ring 12 is used for supporting the first arc-shaped wall 111 of each connecting member 11, and the outer support ring 13 is used for supporting the second arc-shaped wall 112 of each connecting member 11; the hoisting device hoists the inner support ring 12 and the outer support ring 13 from the splicing device to the press-fitting device, and the press-fitting device described in embodiment 1 press-fits the annular assembly at the front end of the central body 10 and separates the annular assembly from the inner support ring 12 and the outer support ring 13.

When splicing, firstly, a plurality of connecting components 11 are sequentially placed on the guide ring 20, and the movable pins 30 are correspondingly inserted into the connecting holes of the connecting components 11 one by one; then, the other movable pins 30 are drawn close to the movable pin 30 by taking one movable pin 30 as a reference to ensure that the adjacent connecting components 11 are overlapped in sequence, then the pressing ring 31 is driven to draw close to each movable pin 30, each movable pin 30 is gradually spaced at equal intervals from the reference movable pin 30, after all the movable pins 30 are distributed at equal intervals, the movable pins 30 are moved out of the connecting holes, then the pressing ring 21 is driven to press downwards, the pressing ring 21 firstly clamps the connecting components 11, then the guide ring 20 and the connecting components 11 are driven to move downwards, so that the first arc-shaped wall 111 of the connecting component 11 slides to the inner annular surface of the inner supporting ring, and the second arc-shaped wall 112 slides to the outer annular surface of the outer supporting ring. After the connecting member 11 is pressed on the inner supporting ring 12 and the outer supporting ring 13, the first piston cylinder drives the discharging rod 51 to move, and the discharging rod 51 jacks up the inner supporting ring 12 and the outer supporting ring 13 so as to facilitate hoisting of a hoisting mechanism. The movable pin 30 can be maintained at the first station by aligning the movable pin 30 with the connection hole while placing the connection member 11 and then pressing the movable pin 30 to the first station. The depression of the actuation platen 32 after the equidistant distribution of the movable pins 30 enables all of the movable pins 30 to be simultaneously withdrawn from the respective connecting holes.

During press mounting, firstly, the central body 10 is hung on the supporting seat 62, the vertical upright post 63 penetrates through the central body 10, then the inner limiting seat 64 is installed on the vertical upright post 63, and then the inner supporting ring 12 and the outer supporting ring 13 are hung above the central body 10, so that the inner retainer ring 14 is in blocking connection with the inner limiting seat 64, and the outer retainer ring 15 is in blocking connection with the outer limiting seat 65; then the lifting plate 70 is driven to move downwards, at this time, the first annular pressing block 71 and the second annular pressing block 72 respectively press the inner support ring 12 and the outer support ring 13 downwards, the first arc-shaped wall 111 and the second arc-shaped wall 112 of the connecting member 11 are blocked by the inner retaining ring 14 and the outer retaining ring 15, so that the inner support ring 12 is kept at the original height, the first arc-shaped wall 111 is separated from the inner support ring 12, the outer support ring 13 is separated from the second arc-shaped wall 112, and the first arc-shaped wall 111 and the second arc-shaped wall 112 are respectively and elastically clamped on two sides of the central body 10.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims

1. A centerbody assembly for a gas turbine engine, comprising: comprises a cone-shaped central body (10) made of ceramic material and a mechanical connecting piece arranged at the front end of the central body (10); the central body (10) is obtained by the following method:

step 1: coating a layer of ceramic substrate in the conical cylindrical mold;

and 5: separating the solidified ceramic substrate from the conical cylindrical mold to obtain a central body (10) blank;

step 6: polishing and finishing the inner and outer surfaces of the central body (10) blank; and a connecting hole is processed at the front end edge of the blank of the central body (10);

and 7: feeding the central body (10) blank into a heating furnace to be sintered to obtain the central body (10);

the mechanical connector comprises an annular assembly formed by splicing a plurality of connecting members (11) along the circumferential direction of the central body (10), and overlapping parts are arranged between the adjacent connecting members (11); the connecting member (11) comprises a first arc-shaped wall (111) and a second arc-shaped wall (112), the first arc-shaped wall (111) and the second arc-shaped wall (112) are connected into a saddle-shaped integrated structure through an elastic body (113), a connecting hole is formed in the first arc-shaped wall (111), the first arc-shaped wall (111) is attached to the inner wall of the central body (10), the second arc-shaped wall (112) is attached to the outer wall of the central body (10), the end faces of the elastic body (113) and the central body (10) are oppositely arranged, and a gap is formed between the elastic body (113) and the central body (10;

the connecting members (11) are spliced into the annular assembly by splicing equipment and attached to the inner support ring (12) and the outer support ring (13), the inner support ring (12) is used for supporting a first arc-shaped wall (111) of each connecting member (11), and the outer support ring (13) is used for supporting a second arc-shaped wall (112) of each connecting member (11); the hoisting equipment hoists the inner support ring (12) and the outer support ring (13) from the splicing equipment to the press-fitting equipment, and the press-fitting equipment presses the annular assembly at the front end of the central body (10) and separates the annular assembly from the inner support ring (12) and the outer support ring (13).

2. The gas turbine engine centerbody assembly of claim 1, wherein: the splicing equipment comprises a base (40), wherein a guide ring (20) is arranged on the base (40), the guide ring (20) is movably arranged along the axis direction of the guide ring, a first arc-shaped wall (111) and a second arc-shaped wall (112) of each connecting member (11) are respectively attached to the inner ring surface and the outer ring surface of the guide ring (20), an elastic body (113) of each connecting member (11) is arranged at the end part of the guide ring (20) in a spanning mode, and the connecting members (11) are circumferentially arranged along the guide ring (20); the adjusting mechanism comprises movable pins (30), the axis direction of the movable pins (30) is arranged along the radial direction of the guide ring (20), the movable pins (30) are arranged in a sliding mode along the circumferential direction of the guide ring (20), the movable pins (30) and connecting holes in the first arc-shaped wall (111) form detachable plug-in fit, and the adjusting mechanism further comprises distance adjusting units for driving the movable pins (30) to be arranged at equal intervals; the distance adjusting unit comprises a pressing ring (31), the pressing ring (31) is axially movably arranged along the guide ring (20), a plurality of inserting blocks (311) are arranged at intervals at equal intervals along the circumferential direction at one end of the pressing ring (31), the inserting blocks (311) axially extend towards one end of the pressing ring (31) in a protruding mode along the pressing ring (31), a positioning groove used for positioning the circumferential position of each movable pin (30) is formed by a gap between every two adjacent inserting blocks (311), chamfers are arranged on two sides of a groove opening of each positioning groove, and the end face of each inserting block (311) is distributed in a stepped mode along the circumferential direction of the pressing ring (31); when in positioning, one of the movable pins (30) is taken as a reference to draw the rest movable pins (30) close to the reference movable pin (30), then the insert block (311) with the longest protruding distance is aligned with the reference movable pin (30) and the gap between the adjacent movable pins (30), then the press ring (31) is driven to gradually draw close to each movable pin (30) along the axial direction, and at the moment, the insert blocks (311) can gradually and equidistantly space each movable pin (30) from the reference movable pin (30) one by one under the guidance of the chamfer; the outer ring-shaped guide ring is characterized by further comprising a first expansion part (41) attached to the inner ring surface of the guide ring (20) and a second expansion part (42) attached to the outer ring surface of the guide ring (20), wherein the first expansion part (41) and the second expansion part (42) are both cylindrical and fixedly connected with the base (40), the inner support ring (12) is detachably mounted on the inner ring surface of the first expansion part (41), the outer support ring (13) is detachably mounted on the outer ring surface of the second expansion part (42), inner slope guide surfaces which are mutually butted are arranged at the end parts of the first expansion part (41) and the inner support ring (12), and outer slope guide surfaces which are mutually butted are arranged at the end parts of the second expansion part (42) and the outer support ring (13); the connecting device also comprises a pressing ring (21) which is arranged in an opening and closing mode along the axial direction of the guide ring (20) and forms with the guide ring (20), an elastic body (113) which can clamp the connecting member (11) when the pressing ring (21) approaches the guide ring (20), and when the pressing ring (21) continuously presses the guide ring (20) towards the direction of the guide ring (20), the elastic body can drive the guide ring (20) and the connecting member (11) to move towards the first expansion part (41) and the second expansion part (42), at the moment, the first arc-shaped wall (111) of the connecting member (11) slides to the inner ring surface of the inner support ring (12) under the guidance of the inner slope guide surface, and the second arc-shaped wall (112) slides to the outer ring surface of the outer support ring (13) under the guidance of the outer slope guide surface; when splicing, firstly, a plurality of connecting components (11) are sequentially placed on the guide ring (20) and the movable pins (30) are correspondingly inserted into the connecting holes of the connecting components (11); then, other movable pins (30) are drawn close to the movable pins (30) by taking one movable pin (30) as a reference to ensure that adjacent connecting members (11) are overlapped in sequence, then the pressing ring (31) is driven to draw close to each movable pin (30), each movable pin (30) is gradually spaced at equal intervals from the reference movable pin (30), after all the movable pins (30) are distributed at equal intervals, the movable pins (30) are moved out of the connecting holes, then the pressing ring (21) is driven to press downwards, the pressing ring (21) firstly clamps the connecting members (11), then the guide ring (20) and the connecting members (11) are driven to move downwards, so that the first arc-shaped wall (111) of the connecting member (11) slides to the inner annular surface of the inner supporting ring, and the second arc-shaped wall (112) slides to the outer annular surface of the outer supporting ring.

3. The gas turbine engine centerbody assembly of claim 2, wherein: ribbed plates are arranged on the inner ring surface of the inner support ring (12) and the outer ring surface of the outer support ring (13), the plate surfaces of the ribbed plates are vertical to the axes of the inner support ring (12) and the outer support ring (13), a discharging rod (51) for driving the inner support ring (12) and the outer support ring (13) to be separated from the base (40) is arranged on the base (40), one end of the discharging rod (51) is blocked with the ribbed plates of the inner support ring (12) and the outer support ring (13), the other end of the discharging rod (51) is fixedly connected with a discharging plate (50), and the discharging plate (50) is fixedly connected with a piston rod of a first piston cylinder; a reset ejector rod (52) is further arranged on the discharging plate (50), and the reset ejector rod (52) is in blocking connection with one end face, far away from the pressing ring (21), of the guide ring (20); after the connecting component (11) is pressed on the inner supporting ring (12) and the outer supporting ring (13), the first piston cylinder drives the discharging rod (51) to move, and the discharging rod (51) jacks up the inner supporting ring (12) and the outer supporting ring (13) so as to facilitate hoisting of a hoisting mechanism.

4. The gas turbine engine centerbody assembly of claim 3, wherein: the movable pin (30) is arranged on the sliding block (33) in a sliding mode along the axial direction of the movable pin, the sliding block (33) is arranged on a circular track (34) in a sliding mode, and the track (34) is fixed on the base (40); the movable pin (30) has a first position and a second position relative to the sliding block (33), and can be protruded into the connecting hole of the connecting component (11) when the movable pin (30) is positioned at the first position and can be pulled out of the connecting hole when the movable pin (30) is positioned at the second position; a first elastic unit (35) is arranged between the movable pin (30) and the sliding block (33), the first elastic unit (35) is assembled to enable the elastic force of the first elastic unit to drive the movable pin (30) to move from the first station to the second station, the movable pin (30) can be assembled to move from the second station to the first station in a manual pressing mode, a locking mechanism is further arranged between the movable pin (30) and the sliding block (33), and the locking mechanism is assembled to enable the movable pin (30) located at the first station to be kept at the first station and the movable pin (30) to be released from the first station; the locking mechanism comprises a clamping groove (301) arranged on the movable pin (30) and a clamping plate (36) which is connected with the sliding block (33) in a sliding mode along the radial direction of the movable pin (30), a convex hole is formed in the clamping plate (36), the convex hole comprises a first hole area and a second hole area, the width of one hole area is larger than that of the second hole area, the width of the first hole area is larger than that of the section of the movable pin (30), and the width of the second hole area is smaller than that of the section of the movable pin (30) and larger than that of the clamping groove (301) on the movable pin (30); a second elastic unit (37) is arranged between the clamping plate (36) and the sliding block (33), when the movable pin (30) is positioned at the first station, the clamping plate (36) is flush with the clamping groove (301), and at the moment, the clamping plate (36) can clamp the second hole area in the clamping groove (301) under the action of the second elastic unit (37); the movable pin (30) can be held at the first station by aligning the movable pin (30) with the connection hole when the connection member (11) is placed and then pressing the movable pin (30) to the first station.

5. The gas turbine engine centerbody assembly of claim 4, wherein: the locking mechanism is used for driving the locking mechanism to release the movable pins (30) located at the first station, the unlocking unit comprises a pressing plate (32) which is movably arranged along the axial direction of the guide ring (20), and the pressing plate (32) is axially blocked and connected with a clamping plate (36) on the sliding block (33) along the guide ring (20), so that the movable pins (30) are equidistantly distributed, and then the pressing plate (32) is driven to be pressed downwards to enable all the movable pins (30) to be simultaneously drawn out of the connecting holes.

6. The gas turbine engine centerbody assembly of claim 5, wherein: the pressing plate (32) is fixedly connected with the pressing ring (31), and the pressing plate (32) is contacted with the clamping plate (36) only after all the movable pins (30) are positioned by the inserting blocks (311) on the pressing ring (31); the pressing plate (32) is movably connected with the pressing ring (21) along the circumferential direction, a third elastic unit (211) is arranged between the pressing plate (32) and the pressing ring (21), the third elastic unit (211) is assembled to enable the elastic force of the third elastic unit to drive the pressing plate (32) to move downwards relative to the pressing ring (21), and the pressing ring (21) is fixedly connected with a piston rod of a second piston cylinder; a limiting table (45) in blocking connection with the pressing plate (32) is arranged on the base (40); an inner ring groove for avoiding the movable pin (30) is formed in the inner ring surface of the guide ring (20); the two ends of the connecting member (11) are respectively provided with an extending part (114) which is used for being overlapped with the adjacent connecting member (11), the thickness of the extending part (114) is smaller than that of the connecting member (11), the extending part (114) at one end is flush with the outer wall of the connecting member (11), and the extending part (114) at the other end is flush with the inner wall of the connecting member (11).

7. The gas turbine engine centerbody assembly of claim 6, wherein: the inner supporting ring is characterized in that an inner retaining ring (14) which is matched with the inner supporting ring (12) in a sliding mode along the axial direction of the inner supporting ring (12) is arranged on the inner ring surface of the inner supporting ring (12), an outer retaining ring (15) which is matched with the outer supporting ring (13) in a sliding mode along the axial direction of the outer supporting ring (13) is arranged on the outer ring surface of the outer supporting ring (13), the inner retaining ring (14) is connected with the end face of the first arc-shaped wall (111) in a blocking mode, and the outer retaining ring (15) is connected with the end face of the second arc-shaped wall (112).

8. The gas turbine engine centerbody assembly of claim 7, wherein: the press fitting equipment comprises a supporting seat (62) used for supporting a central body (10), wherein a tapered hole which is consistent with the outline of the outer wall of the central body (10) is formed in the supporting seat (62), the front end of the central body (10) faces upwards and is installed on the supporting seat (62), the supporting seat (62) is installed on a base (60) through a hydraulic support column (61), an outer limiting seat (65) which is in blocking connection with the edge of an outer retainer ring (15) is arranged above the supporting seat (62), the outer limiting seat (65) is fixedly connected with the supporting seat (62), a vertical upright column (63) is arranged on the base (60), a detachable inner limiting seat (64) is arranged at the upper end of the vertical upright column (63), and the edge of the inner limiting seat (64) is in blocking connection; a first annular pressing block (71) and a second annular pressing block (72) are arranged above the central body (10), an inner guide post (121) is arranged on a ribbed plate of the inner support ring (12), the inner guide post (121) penetrates through the inner check ring (14) to be arranged, an outer guide post (131) is arranged on a ribbed plate of the outer support ring (13), the outer guide post (131) penetrates through the outer check ring (15) to be arranged, the first annular pressing block (71) is connected with the upper end of the inner guide post (121) in a blocking mode, the second annular pressing block (72) is connected with the upper end of the outer guide post (131) in a blocking mode, the first annular pressing block (71) and the second annular pressing block (72) are installed on the lifting plate (70), and the lifting plate (70) is fixedly; during press mounting, firstly, a central body (10) is hung on a supporting seat (62), a vertical upright post (63) penetrates through the central body (10), then an inner limiting seat (64) is installed on the vertical upright post (63), and an inner supporting ring (12) and an outer supporting ring (13) are hung above the central body (10), so that an inner retainer ring (14) is in blocking connection with the inner limiting seat (64), and an outer retainer ring (15) is in blocking connection with an outer limiting seat (65); then the lifting plate (70) is driven to move downwards, at the moment, the first annular pressing block (71) and the second annular pressing block (72) respectively press the inner support ring (12) and the outer support ring (13) downwards, the first arc-shaped wall (111) and the second arc-shaped wall (112) of the connecting member (11) are blocked by the inner retaining ring (14) and the outer retaining ring (15) and accordingly can be kept at the original height, the inner support ring (12) is separated from the first arc-shaped wall (111), the outer support ring (13) is separated from the second arc-shaped wall (112), and the first arc-shaped wall (111) and the second arc-shaped wall (112) are respectively and elastically clamped on two sides of the central body (10).

9. The gas turbine engine centerbody assembly of claim 8, wherein: the inner retainer ring (14) is provided with at least two first positioning grooves (141), the inner limiting seat (64) is provided with at least two first positioning pins (641), and the first positioning pins (641) are matched with the first positioning grooves (141) to realize circumferential positioning between the inner retainer ring (14) and the inner limiting seat (64); the outer retainer ring (15) is provided with at least two second positioning grooves (151), the outer limiting seat (65) is provided with at least two second positioning pins (651), and the second positioning pins (651) are matched with the second positioning grooves (151) to realize circumferential positioning between the outer retainer ring (15) and the outer limiting seat (65).

10. The gas turbine engine centerbody assembly of claim 9, wherein: a third positioning pin (43) and a fourth positioning pin (44) which are respectively matched with the first positioning groove (141) and the second positioning groove (151) are arranged on the base (40); the inner support ring (12) and the inner retainer ring (14) are formed by splicing at least two arc-shaped sections which are detachably connected.