CN201858082U - Wind power generation hydraulic system - Google Patents

Abstract

The utility model discloses a hydraulic system for wind power generation, which comprises an oil pump, an external oil tank, a main shaft braking unit, a yaw braking unit and a safety pressure maintaining unit. The oil cylinder group pipeline is connected to the yaw brake cylinder group pipeline through the first adjustable throttle valve, and the accumulator pipeline is connected to the accumulator pipeline through the second adjustable throttle valve, and the main shaft brake cylinder group is connected to the external oil tank through the second solenoid valve Pipeline connection, the yaw brake cylinder group is connected to the pipeline of the external fuel tank through the third solenoid valve and the first overflow valve, the accumulator is connected to the pipeline of the external fuel tank through the third overflow valve, and the external fuel tank is overflowed through the second overflow valve. The valves are respectively connected with the yaw brake oil cylinder pipelines through the first adjustable throttle valve. The wind power generation hydraulic system of the utility model can not only perform main shaft braking and yaw braking, but also has a system pressure maintaining device.

Description

Wind power hydraulic system

technical field

The utility model belongs to the technical field of wind power generation, in particular to a hydraulic system for wind power generation.

Background technique

The hydraulic brake of the wind turbine mainly includes the main shaft brake unit and the yaw brake unit.

When the main shaft brake unit and yaw brake unit are braking, the hydraulic system failure is often caused by the hydraulic oil pressure in the hydraulic system pipeline is too high, or the hydraulic oil flow rate of the hydraulic oil to the main shaft brake cylinder is uneven. This results in excessive or insufficient braking force.

When the oil pump fails, the motor needs to be shut down intermittently, or the oil pipeline is cut off, the hydraulic system failure will often be caused by the hydraulic oil pressure in the hydraulic system pipeline being too high, insufficient or unstable, affecting the main shaft brake device and yaw brake device In addition, during the maintenance process, the pressure in the pipeline is often reduced due to the loss of hydraulic oil in the hydraulic system, which makes the main shaft brake device and yaw brake device unable to work normally.

Utility model content

The technical problem to be solved by the utility model is to provide a hydraulic system for wind power generation, which not only realizes main shaft braking and yaw braking, but also has a pressure maintaining function to ensure the normal operation of the hydraulic system.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A hydraulic system for wind power generation, including an oil pump, an external oil tank, a main shaft braking unit controlling a main shaft braking oil cylinder group, a yaw braking unit controlling a yaw braking oil cylinder group, and a safety pressure maintaining unit with an accumulator. The oil pump is connected by the same pipeline Respectively through the pressure reducing valve and the first electromagnetic valve to connect with the pipeline of the main shaft brake cylinder group, through the first adjustable throttle valve to connect with the pipeline of the yaw brake cylinder group, through the second adjustable throttle valve to connect with the pipeline of the accumulator , the pressure relief end of the pressure reducing valve is connected to the external fuel tank pipeline, the spindle brake cylinder group is connected to the external fuel tank pipeline through the second solenoid valve, and the yaw brake cylinder group is connected to the external fuel tank pipeline through the third solenoid valve and the first overflow valve. The accumulator is connected to the pipeline of the external fuel tank through the third relief valve, the external fuel tank is connected to the pipeline of the yaw brake cylinder group through the first adjustable throttle valve through the second relief valve, and the pipeline of the yaw brake cylinder group is connected through the second adjustable relief valve. The throttling valve is connected with the pipeline of the accumulator, and the external oil tank is also connected with the pipeline of the accumulator through the second adjustable throttling valve through the manual pump and the first one-way valve.

The oil pump of the utility model is respectively connected to the pressure reducing valve, the first adjustable flow valve and the second adjustable flow valve pipeline through the first filter and the first one-way valve in sequence.

A third one-way valve and a throttling plug are sequentially arranged on the pipeline between the pressure reducing valve of the utility model and the first electromagnetic valve.

In the utility model, a third adjustable flow valve is arranged between the first electromagnetic valve and the pipeline of the main shaft brake oil cylinder group, and the main shaft brake oil cylinder group is connected with the pipeline of the second electromagnetic valve through the third adjustable flow valve.

The first adjustable flow valve of the utility model is connected with the pipeline of the yaw brake oil cylinder group through the fourth check valve and the throttle valve sequentially.

The yaw brake oil cylinder group of the utility model is also connected with the pipeline of the external oil tank through the fourth electromagnetic valve, and the yaw brake oil cylinder group is respectively connected with the pipelines of the third electromagnetic valve and the fourth electromagnetic valve through the second filter.

The accumulator of the utility model is also connected with the pipeline of the external fuel tank through the fourth throttle valve.

In the utility model, the main shaft brake oil cylinder group, the yaw brake oil cylinder group and the pipelines at the accumulator end are respectively provided with pressure measuring joints.

The beneficial effect of adopting the above-mentioned technical scheme:

The pressure reducing valve used in the utility model is automatically turned on when the hydraulic oil in the pipeline exceeds the set pressure, and the hydraulic oil is discharged to the external oil tank to prevent the hydraulic system from operating failure due to excessive pipeline pressure;

The adjustable throttling valve is used to balance the flow speed of the hydraulic oil in the pipeline, and the oil cylinder moves smoothly when pushing the piston rod out, so as to ensure the stability of the main shaft of the hydraulic system when braking;

The first relief valve adopted enables the hydraulic system to realize the yaw of the wind turbine under the condition of back pressure, thereby reducing energy consumption and improving work efficiency;

The accumulator used, when the oil pump fails, the motor needs to be stopped intermittently or the pipeline is cut off, the hydraulic oil stored in the accumulator is released and flows into the main shaft brake unit and yaw brake unit to ensure that the two normal operation of the unit;

With the manual pump used, when the fan is shut down for maintenance, the motor does not start, and the solenoids are not powered. Start the manual pump to supply oil to the main shaft brake and yaw brake device, so that the main shaft and yaw ring gear brake and brake, and at the same time The accumulator will be filled with oil to store pressure. During the whole maintenance process, the pressure of the accumulator can supplement the pressure loss in the system and play a role in maintaining pressure. the

Description of drawings

Fig. 1 is the system schematic diagram of the present utility model.

in:

010—Oil pump 011—First filter 012—Second check valve 020—Spindle brake unit 021—Decompression valve 022—Third check valve 023—Throttle plug 024—First solenoid valve 025—Second solenoid valve 026—Third adjustable throttle valve 027—Spindle cylinder group 030—Yaw brake unit 031—First adjustable throttle valve 032—Fourth one-way valve 033—Yaw cylinder group 034—Second filter 035—Third Solenoid valve 036—fourth solenoid valve 037—first relief valve 038—second relief valve 039—throttle valve 040—safety pressure holding unit 041—second adjustable flow valve 042—third relief valve 043— Fourth adjustable throttle valve 044—accumulator 045—hand pump 046—first one-way valve 050—external oil tank 061—pressure test connector 062—pressure test connector 063—pressure test connector. the

Detailed ways

Below in conjunction with specific embodiment the utility model is further described:

Please refer to FIG. 1 , which is a schematic diagram of the system of the present invention, including an oil pump 010 , a main shaft braking unit, a yaw braking unit, a safety pressure maintaining unit and an external fuel tank 050 .

The oil pump 010 is connected to the main shaft brake unit, the yaw brake unit and the safety pressure maintaining unit through the pipelines of the first filter 011 and the second one-way valve 012 through the same pipeline.

The spindle brake unit is composed of the oil pump 010 through the first filter 011, the second one-way valve 012, the pressure reducing valve 021, the third one-way valve 022, the throttle plug 023, the first electromagnetic valve 024, and the third adjustable flow valve. The valve 026 is connected with the pipeline of the spindle brake oil cylinder group 027.

Main shaft brake oil cylinder group 027 is made up of two main shaft brake oil cylinders arranged side by side.

The first filter 011 filters out the impurities in the hydraulic oil in the pipeline, thereby preventing the impurities from depositing and scaling in the pipeline.

The second one-way valve 012 and the third one-way valve 022 prevent backflow of hydraulic oil in the pipeline.

The pressure switch pipeline is connected to the pipeline of the third adjustable throttle valve 026 and the spindle brake cylinder group 027; meanwhile, the pressure measuring joint 061 is also connected to the pipeline of the third adjustable throttle valve 026 and the spindle brake cylinder group 027.

The pressure switch and the pressure measuring joint 061 show whether the main shaft brake unit 020 is in a normal working state.

The third adjustable throttle valve 026 can ensure that the flow speed of the hydraulic oil in the hydraulic pipeline is balanced, which makes the piston rod of the oil cylinder in the main shaft brake cylinder group 027 move smoothly when it is released, thereby ensuring the stability of the hydraulic system when the main shaft brakes.

The main shaft brake oil cylinder group 027 is connected to the external oil tank 050 through the second solenoid valve 025 , and the second solenoid valve 025 is connected to the pipeline between the first solenoid valve 024 and the third adjustable throttle valve 026 .

The pressure relief end of the pressure reducing valve 021 is connected with the external oil tank 050 through the pipeline between the second electromagnetic valve 025 and the external oil tank 050 .

The pressure reducing valve 021 is automatically turned on when the hydraulic oil in the pipeline exceeds the set pressure, and the hydraulic oil is discharged to the external oil tank 050 to prevent the hydraulic system from malfunctioning due to excessive pipeline pressure.

Both the first solenoid valve 024 and the second solenoid valve 025 are two-position two-way solenoid valves.

When the wind power generator needs the spindle to stop and brake, both the first solenoid valve 024 and the second solenoid valve 025 are in a power-off state, at this time, the first solenoid valve 024 is turned on to the left, and the second solenoid valve 025 is closed. After the hydraulic oil provided by the oil pump 010 passes through the pressure reducing valve 021, the pressure drops to the set value, and then passes through the third check valve 022, the throttle plug 023 and the left passage of the first solenoid valve 024 to reach the second solenoid valve on the pipeline. At the connection point of the valve 025, since the second electromagnetic valve 025 is in the closed state, all the hydraulic oil enters the rodless chamber of the main shaft oil cylinder through the third adjustable throttle valve 026, so that the piston rod is stretched out, thereby braking the main shaft of the wind turbine.

When the wind power generator starts running again, both the first solenoid valve 024 and the second solenoid valve 025 are in the energized state, at this moment, the first solenoid valve 024 is closed, and the second solenoid valve 025 is turned on. The first electromagnetic valve 024 is in the closed state, at this time no hydraulic oil enters the spindle brake cylinder group 027, and at the same time the second solenoid valve 025 is in the conduction state, the hydraulic oil in the spindle brake cylinder group 027 passes through the second solenoid valve 025, and The pressure relief port flows to the external oil tank 050, and the oil cylinder piston rod of the main shaft brake oil cylinder group 027 retracts under the action of the spring force, so that the main shaft brake of the wind power generator is released.

When the push rod of the main shaft brake oil cylinder is retracted to a stable position, the second electromagnetic valve 025 is de-energized, and during the normal operation of the wind turbine, the first electromagnetic valve 024 is always in an energized state.

The yaw brake unit is composed of the oil pump 010 through the first filter 011, the second one-way valve 012, the first adjustable throttle valve 031, the fourth one-way valve 032, the throttle valve 039 and one end of the yaw brake cylinder group 033. Pipeline connection, the other end of the yaw brake cylinder group 033 is connected to the pipeline of the external fuel tank 050 through the second filter 034, the third solenoid valve 035, and the first overflow valve 037 in sequence, and the other end of the yaw brake cylinder group 033 is also sequentially It is connected to the external oil tank 050 through the second filter 034 and the fourth electromagnetic valve 036. The pipelines of the fourth electromagnetic valve 036, the third electromagnetic valve 035 and the first overflow valve 037 are arranged in parallel.

The yaw brake cylinder group 033 is composed of six yaw cylinders arranged in series.

A branch leading to the external oil tank 050 is provided on the pipeline between the second check valve 012 and the first adjustable throttle valve 031 , and a second relief valve 038 is provided on the branch.

The second overflow valve 038 is automatically turned on when the hydraulic oil pressure in the pipeline exceeds the set value, and the hydraulic oil is discharged to the external oil tank 050 to prevent the hydraulic system from malfunctioning due to excessive pipeline pressure.

The first adjustable throttle valve 031 ensures that the flow speed of the hydraulic oil in the hydraulic pipeline is balanced, which makes the yaw brake cylinder move smoothly when pushing the piston rod out, thereby ensuring the stability of the hydraulic system when yaw braking.

The second one-way valve 012 and the fourth one-way valve 032 prevent backflow of hydraulic oil in the pipeline.

The first filter 011 and the second filter 034 filter out impurities in the hydraulic oil in the pipeline, thereby preventing impurities from depositing and scaling in the pipeline.

The pipeline of the pressure measuring joint 062 is connected to the pipeline of the throttle valve 039 and the yaw brake oil cylinder group 033, and the pressure measuring joint 062 detects whether the yaw braking unit 030 is in a normal working state.

During the normal operation of the wind turbine, the third solenoid valve 035 and the fourth solenoid valve 036 are de-energized and in the closed state, and the hydraulic oil provided by the oil pump 010 passes through the first filter 011, the second one-way valve 012, the second An adjustable throttle valve 031, a fourth one-way valve 032, and a throttle valve 039 enter the rodless cavity at one end of the yaw brake cylinder group 033, then flow out from the other end, pass through the second filter 034, and reach the third solenoid valve 035 At the interface with the fourth solenoid valve 036, since the third solenoid valve 035 and the fourth solenoid valve 036 are both in the closed state, the hydraulic oil cannot pass through, and the piston rod of the yaw brake cylinder is stretched out under the action of the pressure hydraulic oil, so that the fan Yaw ring gear brake.

When the wind turbine needs to yaw, the third solenoid valve 035 is powered on and is in the open state, and the hydraulic oil in the yaw brake cylinder passes through the second filter 034, the right channel of the third solenoid valve 035, and the first overflow valve 037 Flow to the external oil tank 050, so the piston rod of the yaw brake oil cylinder retracts, so that the brake of the yaw ring gear is released, and the wind turbine yaws. At this time, since the set pressure of the third solenoid valve 035 is 55 bar, the rodless cavity of the yaw brake cylinder will always maintain a back pressure of 55 bar, and the retraction distance of the piston rod of the oil cylinder is relatively small.

When the wind turbine needs to be disconnected, the third solenoid valve 035 remains de-energized, the fourth solenoid valve 036 is powered on, and the hydraulic oil in the yaw brake cylinder passes through the second filter 034 and the fourth solenoid valve 036 The right channel flows to the external oil tank 050. Since the back pressure is not set in this oil channel, the piston rod of the yaw brake cylinder retracts a lot, the yaw brake ring gear loosens a lot, and the fan is uncabled.

The safety pressure maintaining unit is connected to the accumulator 044 by the oil pump 010 through the first filter 011, the second one-way valve 012 and the second adjustable throttle valve 041 in sequence, and the external oil tank 050 through the second overflow valve 038, The pipeline of the second adjustable throttle valve 041 is connected to the accumulator 044, and the external oil tank is also connected to the accumulator 044 through the pipeline of the manual pump 045, the first one-way valve 046, and the pipeline of the second adjustable throttle valve 041. Between the accumulator 044 and the second adjustable throttle valve 041, there are also two side-by-side branches leading to the external oil tank 050. One branch leads to the external oil tank 050 through the third relief valve 042, and the other leads to the external oil tank 050. One is to lead to the external oil tank 050 through the fourth adjustable throttle valve 043 .

The pipeline of the pressure measuring joint 063 is connected to the pipeline of the third overflow valve 042 and the accumulator 044, and the pressure measuring joint 063 detects whether the safety pressure holding unit 040 is in a normal working state.

During the operation of the fan, the fourth adjustable flow valve 043 is completely closed, and the set pressure of the third relief valve 042 is greater than the set pressure of the second relief valve 038, so the third relief valve 042 will not Open, the hydraulic oil provided by the oil pump 010 reaches the accumulator 044 through the second adjustable throttle valve 041, and enters the accumulator 044 for storage.

When the motor pump unit 010 breaks down, or the motor needs to be stopped intermittently, or the oil pipeline is cut off, the hydraulic oil stored in the accumulator 044 will be released and flow into the main shaft brake unit 020 and yaw brake unit 030 to ensure Both units work fine.

In addition, when the fan is shut down for maintenance, the motor does not start, and the manual pump 045 is started to suck the oil in the external oil tank 050 and supply it to the oil inlet pipes of the main shaft brake unit 020 and the yaw brake unit 030 through the first check valve 046 Road, supply oil to the main shaft brake unit 020 and yaw brake unit 030, so that the main shaft and yaw brake brake, and at the same time mainly fill the accumulator 044 with oil and accumulate pressure.

During the entire maintenance process, the pressure of the accumulator 044 can supplement the pressure loss in the system and play a role in maintaining pressure. It cooperates with the third check valve 022 of the main shaft brake oil inlet pipeline and the fourth check valve of the yaw brake oil inlet pipeline. The one-way valve 032 ensures that the pressure of the main shaft oil cylinder and the yaw oil cylinder will not decrease, and provides double insurance for the reliability of the main shaft brake and yaw brake.

The specific implementation above is just an example, and it is for those skilled in the art to better understand this patent, and it cannot be understood as a limitation on the scope of this patent, as long as it is any equivalent change made according to the spirit disclosed by this patent or modifications, all fall within the scope of this patent.

Claims (9)

1. wind power generation hydraulic system, it is characterized in that: comprise oil pump, external fuel tank, the main shaft brake units of control main shaft brake oil cylinder group, the driftage brake units of control driftage brake oil cylinder group and the safe pressurize unit of band accumulator, oil pump is connected with main shaft brake oil cylinder group pipeline with first solenoid valve through reduction valve respectively by same pipeline, be connected with driftage brake oil cylinder group pipeline through first adjustable restrictive valve, be connected with the accumulator pipeline through second adjustable restrictive valve, the reduction valve pressure relieving end is connected with the external fuel tank pipeline, main shaft brake oil cylinder group is connected with the external fuel tank pipeline through second solenoid valve, driftage brake oil cylinder group is connected with the external fuel tank pipeline with first relief valve through the 3rd solenoid valve, accumulator is connected with the external fuel tank pipeline through the 3rd relief valve, external fuel tank is connected with driftage brake oil cylinder group pipeline through first adjustable restrictive valve respectively by second relief valve, be connected with the accumulator pipeline through second adjustable restrictive valve, external fuel tank also is connected with the accumulator pipeline through second adjustable restrictive valve with first one-way valve by hand pump.

2. wind power generation hydraulic according to claim 1 system, it is characterized in that: described oil pump is connected with reduction valve, first adjustable restrictive valve and the second adjustable restrictive valve pipeline respectively with first one-way valve through first filter successively.

3. wind power generation hydraulic according to claim 1 system is characterized in that: be disposed with the 3rd one-way valve and orifice plug on the pipeline between the described reduction valve and first solenoid valve.

4. wind power generation hydraulic according to claim 1 system, it is characterized in that: be provided with the 3rd adjustable restrictive valve between described first solenoid valve and the described main shaft brake oil cylinder group pipeline, described main shaft brake oil cylinder group is connected with the second solenoid valve pipeline through the 3rd adjustable restrictive valve.

5. wind power generation hydraulic according to claim 1 system, it is characterized in that: described first adjustable restrictive valve is connected with described driftage brake oil cylinder group pipeline with throttle valve through the 4th one-way valve successively.

6. wind power generation hydraulic according to claim 1 system, it is characterized in that: described driftage brake oil cylinder group also is connected with the external fuel tank pipeline through the 4th solenoid valve.

7. wind power generation hydraulic according to claim 6 system, it is characterized in that: described driftage brake oil cylinder group is connected with the 4th solenoid valve pipeline with the 3rd solenoid valve through second filter respectively.

8. wind power generation hydraulic according to claim 1 system, it is characterized in that: described accumulator also is connected with described external fuel tank pipeline through the 4th throttle valve.

9. wind power generation hydraulic according to claim 1 system is characterized in that: be respectively arranged with pressure measuring tie-in on the pipeline of described main shaft brake oil cylinder group, driftage brake oil cylinder group and accumulator end.