Hydraulic system suitable for wind driven generator

Abstract

The utility model provides a hydraulic system suitable for a wind driven generator. The hydraulic system comprises a main shaft brake executing mechanism, a yaw brake executing mechanism, an oil tank assembly, an oil supply motor pump set and a control valve block assembly. The control valve block assembly comprises a valve block body, a first electromagnetic reversing valve, a second electromagnetic reversing valve and a third electromagnetic valve. One end of the second electromagnetic directional valve is connected with the main shaft brake actuating mechanism, and the other end of the second electromagnetic directional valve is connected with a first oil port in one side of the third electromagnetic valve and the oil supply motor pump set; one end of the first electromagnetic directional valve is connected with the main shaft brake actuating mechanism, and the other end of the first electromagnetic directional valve is connected with a second oil port in one side of the third electromagnetic valve and the oil tank assembly; and the other oil port of the third electromagnetic valve is connected with a yaw brake actuating mechanism. According to the utility model, each group of sandwich valve blocks are integrated, so that leakage among the sandwich valve blocks and leakage of connecting oil pipes among the sandwich valve blocks are avoided, the structure is more compact, leakage is not easy to occur, meanwhile, system oil ways of a main shaft brake, a yaw brake and a variable pitch are optimized, and leakage points of the oil ways are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation technical field, specifically, relate to a kind of hydraulic system suitable for wind driven generator, more particularly, a kind of hydraulic system suitable for wind driven generator. BACKGROUND

[0002] With the running of wind turbine, it will inevitably lead to wear and tear of some mechanical parts, reliability decline, oil contamination, corrosion of sealing surface or aging of consumables, especially the hydraulic system in recent years has shown many problems:

[0003] Specifically, the hydraulic station control valve block structure is complex, there are multiple fitting surfaces and complex pipeline in the superposed valve block, resulting in a lot of leakage points, and the hydraulic station has a long service life, and there are valve block, valve sealing aging and other conditions, so the hydraulic station often has valve block oil leakage and valve oil leakage, which can be restored to normal operation for a short time by replacing valve or sealing temporarily on site, but cannot fundamentally solve the actual problem. SUMMARY

[0004] In view of the defects in the prior art, the utility model aims to provide a hydraulic system suitable for wind driven generator.

[0005] The hydraulic system suitable for wind driven generator according to the utility model comprises a main shaft brake actuating mechanism, a yaw brake actuating mechanism, a variable pitch actuating structure, an oil tank assembly, an oil supply motor pump set and a control valve block assembly connected in sequence.

[0006] The oil supply motor pump set and the control valve block assembly are both installed on the oil tank assembly, and the control valve block assembly comprises a valve block body and a first electromagnetic directional valve, a second electromagnetic directional valve and a third electromagnetic valve integrated in the valve block body.

[0007] The oil port on one side of the second electromagnetic directional valve is connected to the main shaft brake actuating mechanism, and the oil port on the other side of the second electromagnetic directional valve and the first oil port on one side of the third electromagnetic valve are connected to a working oil path bifurcation node, and then jointly connected to the oil supply motor pump set, the working oil path bifurcation node is connected to the oil inlet of the variable pitch actuating structure, forming a working oil path.

[0008] The oil port on one side of the first electromagnetic directional valve is connected to the main shaft brake actuating mechanism, and the oil port on the other side of the first electromagnetic directional valve and the second oil port on one side of the third electromagnetic valve are connected to an oil return path bifurcation node, and then jointly connected to the oil tank assembly, forming a brake oil return path, and the oil return path bifurcation node is connected to the leakage port of the variable pitch actuating structure.

[0009] The oil port on the other side of the third electromagnetic valve is connected to the yaw brake actuating mechanism, and the oil return port of the variable pitch actuating structure is connected to the oil tank assembly, forming a variable pitch oil return path.

[0010] Preferably, the control valve block assembly further comprises a fifth electromagnetic reversing valve, a first overflow valve and a second overflow valve integrated inside the valve block body;

[0011] The fifth electromagnetic reversing valve, the second overflow valve and the first overflow valve are sequentially connected between the working oil circuit and the brake oil return circuit;

[0012] The oil port of the fifth electromagnetic reversing valve, the oil inlet of the second overflow valve and the oil inlet of the first overflow valve are sequentially connected between the oil supply motor pump group and the working oil circuit branching node from upstream to downstream;

[0013] The oil outlet of the first overflow valve, the oil outlet of the second overflow valve and the oil port of the other side of the fifth electromagnetic reversing valve are sequentially connected between the oil return circuit branching node and the oil tank assembly from upstream to downstream, and the set pressure of the first overflow valve is less than that of the second overflow valve.

[0014] Preferably, the control valve block assembly further comprises a first pressure reducing valve, a second pressure reducing valve, a first check valve, a second check valve, a third check valve and a fourth check valve integrated inside the valve block body;

[0015] The third check valve, the second pressure reducing valve and the fourth check valve are sequentially connected between the oil supply motor pump group and the working oil circuit branching node from upstream to downstream, and the first pressure reducing valve is connected between the oil port of one side of the second electromagnetic reversing valve and the main shaft brake actuator;

[0016] The first check valve is connected between the oil port of the other side of the second electromagnetic reversing valve and the working oil circuit branching node, and the second check valve is connected between the first oil port of one side of the third electromagnetic valve and the working oil circuit branching node.

[0017] Preferably, the control valve block assembly further comprises a first pressure switch, a second pressure switch, a third pressure switch, a fourth pressure switch and a pressure gauge;

[0018] The oil port of one side of the second electromagnetic reversing valve and the oil port of one side of the first electromagnetic reversing valve are connected to the oil circuit convergence node, and then connected to the main shaft brake actuator, and the first pressure switch is connected between the oil circuit convergence point and the main shaft brake actuator;

[0019] The second pressure switch is connected between the oil port of one side of the second electromagnetic reversing valve and the oil circuit convergence node, and the third pressure switch is connected between the oil port of the other side of the third electromagnetic valve and the yaw brake actuator;

[0020] The fourth pressure switch is connected between the working oil circuit branching node and the oil supply motor pump group, and the first pressure switch, the second pressure switch, the third pressure switch and the fourth pressure switch are all connected to the pressure gauge.

[0021] Preferably, it further comprises a high-pressure filter installed at the oil outlet of the oil supply motor pump set and an oil return filter installed at the end of the variable pitch oil return path.

[0022] The oil tank assembly comprises an oil tank body, a liquid level switch, a liquid level gauge, an air filter, a drain ball valve and an oil temperature switch.

[0023] The liquid level gauge is arranged on the side wall of the oil tank body and communicates with the inside of the oil tank body, the air filter, the liquid level switch and the oil temperature switch are arranged on the top of the oil tank body and communicate with the inside of the oil tank body, and the drain ball valve is arranged on the bottom of the oil tank body.

[0024] Preferably, the control valve block assembly further comprises a first pressure measuring connector, a second pressure measuring connector, a third pressure measuring connector, a fourth pressure measuring connector and a fifth pressure measuring connector.

[0025] The oil port on one side of the second electromagnetic directional valve is connected to the oil path convergence node, and then connected to the main shaft brake actuator, the first pressure measuring connector is arranged on the oil path convergence node, and the second pressure measuring connector is arranged between the oil port on one side of the second electromagnetic directional valve and the oil path convergence node.

[0026] The third pressure measuring connector is arranged on the working oil path branch node, the fourth pressure measuring connector is arranged between the oil port on the other side of the third electromagnetic valve and the yaw brake actuator, and the fifth pressure measuring connector is arranged at the oil outlet of the oil supply motor pump set.

[0027] Preferably, it further comprises a first accumulator, a second accumulator, and a first pressure sensor, a second pressure sensor and a third pressure sensor integrated in the valve block body.

[0028] The first accumulator and the second accumulator are located on the side of the oil tank assembly, and the first accumulator is connected by pipeline between the working oil path branch node and the second pressure reducing valve, and the second accumulator is connected by pipeline between the second pressure reducing valve and the oil supply motor pump set.

[0029] The first pressure sensor is arranged on the first accumulator, the third pressure sensor is arranged on the second accumulator, and the second pressure sensor is arranged between the connection point of the first accumulator and the working oil path and the working oil path branch node.

[0030] Preferably, the control valve block assembly further comprises a first stop valve and a second stop valve integrated in the inside of the valve block body.

[0031] The first stop valve is connected between an oil road convergence node and a main shaft brake actuator, and the second stop valve is connected between an oil port on the other side of the third electromagnetic valve and a yaw brake actuator.

[0032] Preferably, the control valve block assembly further comprises a fourth electromagnetic valve, a third stop valve and a fourth stop valve integrated inside the valve block body.

[0033] The fourth electromagnetic valve and the fourth stop valve are both connected in parallel with the first overflow valve, and an oil port on one side of the fourth electromagnetic valve, an oil port on one side of the fourth stop valve and an oil inlet of the first overflow valve are connected and then connected to a working oil road.

[0034] The third stop valve is connected between a working oil road and a brake return oil road, and is arranged in parallel between a fifth electromagnetic reversing valve and a second overflow valve.

[0035] Preferably, the control valve block assembly further comprises a proportional servo valve, a sixth pressure measuring connector, a seventh pressure measuring connector and a fifth stop valve integrated inside the valve block body.

[0036] The proportional servo valve, the seventh pressure measuring connector and the fifth stop valve are arranged in sequence from upstream to downstream between the working oil road bifurcation node and the oil inlet of the variable pitch actuator, and the sixth pressure measuring connector is installed in the variable pitch return oil road.

[0037] Compared with the prior art, the utility model has the beneficial effects that:

[0038] The utility model integrates each group of stacked valve blocks, integrates each valve piece on a valve group, thereby avoiding leakage between stacked valve blocks, leakage of connecting oil pipes between stacked blocks, making the structure more compact and not easy to leak, and simultaneously optimizing the system oil road of the main shaft brake, the yaw brake and the variable pitch, thereby reducing the leakage points of the oil road. BRIEF DESCRIPTION OF DRAWINGS

[0039] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0040] Fig. 1 It is a whole structure schematic view of the hydraulic system in the utility model;

[0041] Fig. 2 It is a top view structure schematic view of the hydraulic system in the utility model;

[0042] Fig. 3 It is a hydraulic principle schematic view of the utility model.

[0043] In the drawing, it is shown that:

[0044] Oil tank assembly 1 Liquid level switch 25

[0045] Oil feed motor pump unit 2 liquid level meter 26

[0046] Control valve unit 3 air cleaner 27

[0047] Pressure gauge 4 oil pump 28

[0048] First pressure switch 5 oil drain ball valve 29

[0049] First stop valve 6 fifth pressure tapping 30

[0050] First pressure tapping 7 oil temperature switch 31

[0051] First pressure reducing valve 8 high pressure filter 32

[0052] Second pressure switch 9 oil return filter 33

[0053] First electromagnetic directional control valve 10 third check valve 34

[0054] Second pressure tapping 11 fifth electromagnetic directional control valve 35

[0055] Second electromagnetic directional control valve 12 sixth pressure tapping 36

[0056] First pressure sensor 13 third stop valve 37

[0057] Second pressure sensor 14 second overflow valve 38

[0058] Third pressure tapping 15 fourth stop valve 39

[0059] First check valve 16 fourth check valve 40

[0060] Second check valve 17 second pressure reducing valve 41

[0061] Second stop valve 18 fourth pressure switch 42

[0062] Third pressure switch 19 first accumulator 43

[0063] Fourth pressure tapping 20 second accumulator 44

[0064] Third electromagnetic valve 21 seventh pressure tapping 45

[0065] First overflow valve 22 fifth stop valve 46

[0066] Fourth electromagnetic valve 23 third pressure sensor 47

[0067] Motor 24 DETAILED DESCRIPTION

[0068] The utility model discloses a hydraulic system suitable for wind driven generator, each group of superposition valve block is integrated design, and each valve piece is integrated to a valve group, thereby avoiding the leakage between superposition valve block, the leakage of connecting oil pipe between superposition block, make the structure more compact, not easy to leak, and simultaneously optimize the main shaft brake, yaw brake and the system oil circuit of variable pitch mechanism, reduce the leakage point of oil circuit.

[0069] The utility model discloses a hydraulic system suitable for wind driven generator, each group of superposition valve block is integrated design, and each valve piece is integrated to a valve group, thereby avoiding the leakage between superposition valve block, the leakage of connecting oil pipe between superposition block, make the structure more compact, not easy to leak, and simultaneously optimize the main shaft brake, yaw brake and the system oil circuit of variable pitch mechanism, reduce the leakage point of oil circuit.

[0070] According to the utility model provides a hydraulic system suitable for wind driven generator, as Figs. 1-3 The utility model discloses a hydraulic system suitable for wind driven generator, each group of superposition valve block is integrated design, and each valve piece is integrated to a valve group, thereby avoiding the leakage between superposition valve block, the leakage of connecting oil pipe between superposition block, make the structure more compact, not easy to leak, and simultaneously optimize the main shaft brake, yaw brake and the system oil circuit of variable pitch mechanism, reduce the leakage point of oil circuit.

[0071] The oil port of one side of second electromagnetic reversing valve 12 is connected with main shaft brake actuating mechanism, and the oil port of the other side of second electromagnetic reversing valve 12 and the first oil port of one side of third electromagnetic valve 21 are connected to working oil circuit bifurcation node, and then are jointly connected with oil supply motor pump group 2, the working oil circuit bifurcation node is connected with the oil inlet of variable pitch actuating structure, and forms working oil circuit, the oil port of one side of first electromagnetic reversing valve 10 is connected with main shaft brake actuating mechanism, and the oil port of the other side of first electromagnetic reversing valve 10 and the second oil port of one side of third electromagnetic valve 21 are connected to oil return circuit bifurcation node, and then are jointly connected with oil tank assembly 1, and form brake oil return circuit, the oil return circuit bifurcation node is connected with the leakage port of variable pitch actuating structure, the oil port of the other side of third electromagnetic valve 21 is connected with yaw brake actuating mechanism, and the oil return port of variable pitch actuating structure is connected with oil tank assembly 1, and forms variable pitch oil return circuit.

[0072] The utility model discloses a control oil circuit switching solenoid valve is integrated in the valve block inside, can avoid the leakage between the superposition valve block, the leakage of connecting oil pipe between the superposition block, make the structure more compact, further, through a oil circuit, hydraulic oil is led out from oil tank assembly 1, and is connected respectively main shaft brake actuating mechanism, yaw brake actuating mechanism and the variable pitch execution structure at the working oil circuit bifurcation node, has optimized the design of system oil circuit, has reduced the leakage point of oil circuit.

[0073] The control valve block assembly 3 further includes a fifth electromagnetic reversing valve 35, a first overflow valve 22 and a second overflow valve 38 integrated in the valve block body; the fifth electromagnetic reversing valve 35, the second overflow valve 38 and the first overflow valve 22 are sequentially connected between the working oil circuit and the brake return oil circuit; the oil port on one side of the fifth electromagnetic reversing valve 35, the oil inlet of the second overflow valve 38 and the oil inlet of the first overflow valve 22 are sequentially connected between the oil supply motor pump set 2 and the working oil circuit bifurcation node from upstream to downstream; the oil outlet of the first overflow valve 22, the oil outlet of the second overflow valve 38 and the oil port on the other side of the fifth electromagnetic reversing valve 35 are sequentially connected between the return oil circuit bifurcation node and the oil tank assembly 1 from upstream to downstream, and the set pressure of the first overflow valve 22 is less than the set pressure of the second overflow valve 38.

[0074] The control valve block assembly 3 further includes a first pressure reducing valve 8, a second pressure reducing valve 41, a first check valve 16, a second check valve 17, a third check valve 34 and a fourth check valve 40 integrated in the valve block body; the third check valve 34, the second pressure reducing valve 41 and the fourth check valve 40 are sequentially connected between the oil supply motor pump set 2 and the working oil circuit bifurcation node from upstream to downstream, the first pressure reducing valve 8 is connected between the oil port on one side of the second electromagnetic reversing valve 12 and the main shaft brake actuating mechanism; the first check valve 16 is connected between the oil port on the other side of the second electromagnetic reversing valve 12 and the working oil circuit bifurcation node, and the second check valve 17 is connected between the first oil port on one side of the third electromagnetic valve 21 and the working oil circuit bifurcation node.

[0075] The control valve block assembly 3 further comprises a first pressure switch 5, a second pressure switch 9, a third pressure switch 19, a fourth pressure switch 42 and a pressure gauge 4 integrated inside the valve block body; the oil port on one side of the second electromagnetic reversing valve 12 is connected to the oil port on one side of the first electromagnetic reversing valve 10 to an oil road convergence node, and then connected to the main shaft brake actuator; the first pressure switch 5 is connected between the oil road convergence node and the main shaft brake actuator; the second pressure switch 9 is connected between the oil port on one side of the second electromagnetic reversing valve 12 and the oil road convergence node; the third pressure switch 19 is connected between the oil port on the other side of the third electromagnetic valve 21 and the yaw brake actuator; the fourth pressure switch 42 is connected between the working oil road branch node and the oil supply motor pump set 2; and the first pressure switch 5, the second pressure switch 9, the third pressure switch 19 and the fourth pressure switch 42 are all connected to the pressure gauge 4.

[0076] The hydraulic system further comprises a high-pressure filter 32 and an oil return filter 33; the high-pressure filter 32 is installed at the oil outlet of the oil supply motor pump set 2, and the oil return filter 33 is installed at the end of the variable pitch oil return road; the oil tank assembly 1 comprises an oil tank body, a liquid level switch 25, a liquid level gauge 26, an air filter 27, a drain ball valve 29 and an oil temperature switch 31; the liquid level gauge 26 is arranged on the side wall of the oil tank body and communicates with the inside of the oil tank body; the air filter 27, the liquid level switch 25 and the oil temperature switch 31 are all arranged on the top of the oil tank body and communicate with the inside of the oil tank body; and the drain ball valve 29 is arranged at the bottom of the oil tank body.

[0077] The control valve block assembly 3 further comprises a first pressure measuring connector 7, a second pressure measuring connector 11, a third pressure measuring connector 15, a fourth pressure measuring connector 20 and a fifth pressure measuring connector 30 integrated inside the valve block body; the oil port on one side of the second electromagnetic reversing valve 12 is connected to the oil port on one side of the first electromagnetic reversing valve 10 to an oil road convergence node, and then connected to the main shaft brake actuator; the first pressure measuring connector 7 is arranged on the oil road convergence node, and the second pressure measuring connector 11 is arranged between the oil port on one side of the second electromagnetic reversing valve 12 and the oil road convergence node; the third pressure measuring connector 15 is arranged on the working oil road branch node, the fourth pressure measuring connector 20 is arranged between the oil port on the other side of the third electromagnetic valve 21 and the yaw brake actuator, and the fifth pressure measuring connector 30 is arranged at the oil outlet of the oil supply motor pump set 2.

[0078] The hydraulic system further comprises a first accumulator 43, a second accumulator 44, and a first pressure sensor 13, a second pressure sensor 14 and a third pressure sensor 47 integrated in the valve block body; the first accumulator 43 and the second accumulator 44 are located on the side of the oil tank assembly 1, and the first accumulator 43 is connected by a pipeline between the working oil path branch node and the second pressure reducing valve 41, and the second accumulator 44 is connected by a pipeline between the second pressure reducing valve 41 and the oil supply motor pump set 2; the first pressure sensor 13 is arranged on the first accumulator 43, the third pressure sensor 47 is arranged on the second accumulator 44, and the second pressure sensor 14 is arranged between the connection point of the first accumulator 43 and the working oil path and the working oil path branch node.

[0079] The control valve block assembly 3 further comprises a first stop valve 6 and a second stop valve 18 integrated in the valve block body; the first stop valve 6 is connected between the oil path convergence node and the main shaft brake actuator, and the second stop valve 18 is connected between the oil port on the other side of the third electromagnetic valve 21 and the yaw brake actuator.

[0080] The control valve block assembly 3 further comprises a fourth electromagnetic valve 23, a third stop valve 37 and a fourth stop valve 39 integrated in the valve block body; the fourth electromagnetic valve 23 and the fourth stop valve 39 are connected in parallel with the first overflow valve 22, and the oil port on one side of the fourth electromagnetic valve 23, the oil port on one side of the fourth stop valve 39 and the oil inlet of the first overflow valve 22 are connected and then connected to the working oil path; the third stop valve 37 is connected between the working oil path and the brake return oil path, and the third stop valve 37 is arranged in parallel between the fifth electromagnetic reversing valve 35 and the second overflow valve 38.

[0081] The control valve block assembly 3 further comprises a proportional servo valve, a sixth pressure measuring connector 36, a seventh pressure measuring connector 45 and a fifth stop valve 46 integrated in the valve block body; the proportional servo valve, the seventh pressure measuring connector 45 and the fifth stop valve 46 are arranged in sequence from upstream to downstream between the working oil path branch node and the oil inlet of the variable pitch actuator, and the sixth pressure measuring connector 36 is installed in the variable pitch return oil path.

[0082] Embodiment 1

[0083] The embodiment discloses a new type of hydraulic system of a wind driven generator, which comprises an oil tank assembly 1, an oil supply motor pump set 2 and a control valve block assembly 3, wherein the oil tank assembly 1 provides storage of hydraulic oil for the system, the oil supply motor pump set 2 provides power for the system, and the control valve block assembly 3 controls the on-off of the oil path of the system.

[0084] The control valve block assembly 3 comprises a first electromagnetic reversing valve 10, a second electromagnetic reversing valve 12, a third electromagnetic valve 21, a fourth electromagnetic valve 23, a fifth electromagnetic reversing valve 35, a first check valve 16, a second check valve 17, a third check valve 34, a fourth check valve 40, a first overflow valve 22, a second overflow valve 38, a first shut-off valve 6, a second shut-off valve 18, a third shut-off valve 37, a fourth shut-off valve 39, a fifth shut-off valve 46, a first pressure reducing valve 8, a second pressure reducing valve 41, a high-pressure filter 32, an oil return filter 33, a pressure switch, and a pressure tapping.

[0085] The control valve block assembly 3 can switch to open or close the working oil circuit, the control oil circuit and the oil return circuit, wherein the working oil circuit comprises the oil pump 28, the high-pressure filter 32, the third check valve 34, the second pressure reducing valve 41, the fourth check valve 40, the first check valve 16, the second electromagnetic reversing valve 12, the first pressure reducing valve 8 and the first shut-off valve 6 in sequence.

[0086] When the main shaft brake is applied, the second electromagnetic reversing valve 12 is opened, the main shaft brake is applied, and after the brake is released, the first electromagnetic reversing valve 10 is opened, the oil return circuit is opened, the second electromagnetic reversing valve 12 is closed, and the main shaft brake is released. When the yaw brake is applied, the third electromagnetic valve 21 is opened, the yaw brake is applied, and after the brake is released, the third electromagnetic valve 21 is closed, and the yaw brake is released. By switching the power-on and power-off of the first electromagnetic reversing valve 10 and the second electromagnetic reversing valve 12 in the control valve block assembly 3, the on-off of the control working oil circuit, the oil return circuit and the control oil circuit can be opened, which is simple and convenient to operate and easy to maintain. In addition, the fifth electromagnetic reversing valve 35 can cut off the system power, which can provide emergency protection and ensure the stability and safety of the power device.

[0087] The control valve block assembly 3 comprises a first overflow valve 22 and a second overflow valve 38, the two ends of the first overflow valve 22 are respectively connected to the fourth check valve 40 outlet and the oil tank assembly 1, and the two ends of the second overflow valve 38 are respectively connected to the oil tank assembly 1 and the third check valve 34 outlet. The pressure of the first overflow valve 22 is set to 170 bar, and the pressure of the second overflow valve 38 is set to 280 bar. When the wind turbine hydraulic control system is working, the first overflow valve 22 and the second overflow valve 38 mainly control the pressure of the system oil circuit and the main shaft brake oil circuit, which can effectively prevent the system pressure from being continuously pressed after the oil pump set is started, causing destructive damage to the system and endangering personal and property safety, preventing the system pressure from being too high, and greatly increasing the safety of the wind turbine hydraulic control system.

[0088] The control valve block assembly 3 comprises a high-pressure filter 32 and an oil return filter 33. The two ends of the high-pressure filter 32 are respectively connected to the outlet of the oil pump 28 and the working oil circuit. The two ends of the oil return filter 33 are respectively connected to the variable pitch circuit and the oil tank assembly 1. The filters can effectively prevent larger diameter solid particles from entering the system to cause oil circuit blockage or valve sticking failure, ensuring the safety of the system and prolonging the service life.

[0089] The control valve block assembly 3 comprises a first one-way valve 16, a second one-way valve 17, a third one-way valve 34 and a fourth one-way valve 40. The two ends of the first one-way valve are respectively connected to the outlet of the fourth one-way valve 40 and the inlet of the second electromagnetic reversing valve 12. The two ends of the second one-way valve 17 are respectively connected to the outlet of the fourth one-way valve 40 and the inlet of the third electromagnetic valve 21. The two ends of the third one-way valve 34 are respectively connected to the high-pressure filter 32 and the inlet of the second pressure reducing valve 41. The two ends of the fourth one-way valve 40 are respectively connected to the inlet of the first one-way valve 16 and the outlet of the second pressure reducing valve 41. The first one-way valve 16, the second one-way valve 17, the third one-way valve 34 and the fourth one-way valve 40 can prevent the reverse flow of oil in the power device from damaging the system, improving the reliability and safety of the power device.

[0090] In order to facilitate pressure detection of the working oil circuit, the control valve block assembly 3 comprises a pressure switch 42 and a pressure gauge 4 connected to the working oil circuit. The pressure gauge 4 is used to display the pressure of the working oil circuit on site, so that the staff can control according to the pressure condition, ensuring the safety and stability of the hydraulic system. When the pressure value of the working oil circuit is greater than the set value of the pressure switch 42, the pressure switch 42 is opened. When the pressure value of the working oil circuit is less than the set value of the pressure switch 42, the pressure switch 42 is disconnected. The first pressure switch 42 can realize full-range and remote monitoring of the pressure of the working oil circuit.

[0091] In order to facilitate on-site measurement of the pressure of the working oil circuit, the control valve block assembly 3 further comprises a third pressure measuring connector 15 and a sixth pressure measuring connector 36. The third pressure measuring connector 15 is connected to the working oil circuit, and the sixth pressure measuring connector 36 is connected to the oil return circuit. The third pressure measuring connector 15 and the sixth pressure measuring connector 36 can realize on-site pressure measurement, ensuring the safety of the system. The side wall of the oil tank assembly 1 can be provided with a liquid level gauge 26 connected to the inside of the oil tank assembly 1. The liquid level gauge 26 can detect the liquid level of the oil tank assembly 1, and the staff can directly observe the height of the oil, improving the safety and stability of the system. The top of the oil tank assembly 1 is provided with an air filter 27 connected to the inside of the oil tank assembly 1. The air filter 27 realizes the entry of gas into the oil tank assembly 1, effectively preventing larger particles from entering the oil, ensuring the safety of the hydraulic system of the wind turbine.

[0092] In the description of the present application, it needs to be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0093] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A hydraulic system suitable for a wind power generator, characterized in that, The main shaft brake actuator, the yaw brake actuator, the variable pitch actuator, the oil tank assembly (1), the oil supply motor pump group (2) and the control valve block assembly (3) are sequentially connected; The oil supply motor pump group (2) and the control valve block assembly (3) are both installed on the oil tank assembly (1), and the control valve block assembly (3) comprises a valve block body and a first electromagnetic reversing valve (10), a second electromagnetic reversing valve (12) and a third electromagnetic valve (21) integrated in the valve block body; The oil port on one side of the second electromagnetic reversing valve (12) is connected with the main shaft brake actuator, and the oil port on the other side of the second electromagnetic reversing valve (12) and the first oil port on one side of the third electromagnetic valve (21) are connected to a working oil path branch node, and then are jointly connected with the oil supply motor pump group (2), the working oil path branch node is connected with an oil inlet of the variable pitch actuator, and a working oil path is formed; The oil port on one side of the first electromagnetic reversing valve (10) is connected with the main shaft brake actuator, and the oil port on the other side of the first electromagnetic reversing valve (10) and the second oil port on one side of the third electromagnetic valve (21) are connected to a return oil path branch node, and then are jointly connected with the oil tank assembly (1), a brake return oil path is formed, and the return oil path branch node is connected with a leakage port of the variable pitch actuator; The oil port on the other side of the third electromagnetic valve (21) is connected with the yaw brake actuator, and a variable pitch return oil path is formed by connecting the oil return port of the variable pitch actuator with the oil tank assembly (1).

2. Hydraulic system suitable for wind generators according to claim 1, characterized in that, The control valve block assembly (3) further comprises a fifth electromagnetic reversing valve (35), a first overflow valve (22) and a second overflow valve (38) integrated in the valve block body; The fifth electromagnetic reversing valve (35), the second overflow valve (38) and the first overflow valve (22) are sequentially connected between the working oil path and the brake return oil path; The oil port on one side of the fifth electromagnetic reversing valve (35), the oil inlet of the second overflow valve (38) and the oil inlet of the first overflow valve (22) are sequentially connected between the oil supply motor pump group (2) and the working oil path branch node from upstream to downstream; The oil outlet of the first overflow valve (22), the oil outlet of the second overflow valve (38) and the oil port on the other side of the fifth electromagnetic reversing valve (35) are sequentially connected between the return oil path branch node and the oil tank assembly (1) from upstream to downstream, and the set pressure of the first overflow valve (22) is less than the set pressure of the second overflow valve (38).

3. Hydraulic system suitable for wind generators according to claim 1, characterized in that, The control valve block assembly (3) further comprises a first pressure reducing valve (8), a second pressure reducing valve (41), a first check valve (16), a second check valve (17), a third check valve (34) and a fourth check valve (40) integrated in the valve block body; The third check valve (34), the second pressure reducing valve (41) and the fourth check valve (40) are sequentially connected between the oil supply motor pump group (2) and the working oil path branch node from upstream to downstream, and the first pressure reducing valve (8) is connected between the oil port on one side of the second electromagnetic reversing valve (12) and the main shaft brake actuator; The first one-way valve (16) is connected between the oil port on the other side of the second electromagnetic reversing valve (12) and the working oil path branch node, and the second one-way valve (17) is connected between the first oil port on one side of the third electromagnetic valve (21) and the working oil path branch node.

4. The hydraulic system suitable for use in a wind power generator according to claim 1, characterized in that, The control valve block assembly (3) further comprises a first pressure switch (5), a second pressure switch (9), a third pressure switch (19), a fourth pressure switch (42), and a pressure gauge (4); The oil port on one side of the second electromagnetic reversing valve (12) and the oil port on one side of the first electromagnetic reversing valve (10) are connected to an oil path convergence node, and then connected to the main shaft brake actuator, and the first pressure switch (5) is connected between the oil path convergence node and the main shaft brake actuator; The second pressure switch (9) is connected between the oil port on one side of the second electromagnetic reversing valve (12) and the oil path convergence node, and the third pressure switch (19) is connected between the oil port on the other side of the third electromagnetic valve (21) and the yaw brake actuator; The fourth pressure switch (42) is connected between the working oil path branch node and the oil supply motor pump set (2), and the first pressure switch (5), the second pressure switch (9), the third pressure switch (19), and the fourth pressure switch (42) are all connected with the pressure gauge (4).

5. The hydraulic system suitable for use in a wind power generator according to claim 1, characterized in that, Further comprising a high-pressure filter (32) and an oil return filter (33), the high-pressure filter (32) is installed at the oil outlet of the oil supply motor pump set (2), and the oil return filter (33) is installed at the end of the variable pitch oil return path; The oil tank assembly (1) comprises an oil tank body, a liquid level switch (25), a liquid level gauge (26), an air filter (27), a drain ball valve (29), and an oil temperature switch (31); The liquid level gauge (26) is arranged on the side wall of the oil tank body and communicates with the inside of the oil tank body, the air filter (27), the liquid level switch (25), and the oil temperature switch (31) are all arranged on the top of the oil tank body and communicate with the inside of the oil tank body, and the drain ball valve (29) is arranged on the bottom of the oil tank body.

6. The hydraulic system suitable for use in a wind power generator according to claim 1, characterized in that, The control valve block assembly (3) further comprises a first pressure measuring connector (7), a second pressure measuring connector (11), a third pressure measuring connector (15), a fourth pressure measuring connector (20), and a fifth pressure measuring connector (30); The oil port on one side of the second electromagnetic reversing valve (12) and the oil port on one side of the first electromagnetic reversing valve (10) are connected to an oil path convergence node, and then connected to the main shaft brake actuator, and the first pressure switch (5) is connected between the oil path convergence node and the main shaft brake actuator; The third pressure measuring connector (15) is arranged on the working oil path branch node, the fourth pressure measuring connector (20) is arranged between the oil port on the other side of the third electromagnetic valve (21) and the yaw brake actuator, and the fifth pressure measuring connector (30) is arranged at the oil outlet of the oil supply motor pump set (2).

7. The hydraulic system suitable for use in a wind power generator according to claim 1, characterized in that, The first accumulator (43) and the second accumulator (44) are arranged on the side of the oil tank assembly (1), the first accumulator (43) is connected by a pipeline between the working oil path branch node and the second pressure reducing valve (41), and the second accumulator (44) is connected by a pipeline between the second pressure reducing valve (41) and the oil supply motor pump group (2); The first pressure sensor (13) is arranged on the first accumulator (43), the third pressure sensor (47) is arranged on the second accumulator (44), and the second pressure sensor (14) is arranged between the connection point of the first accumulator (43) and the working oil path and the working oil path branch node. The control valve block assembly (3) further comprises a first stop valve (6) and a second stop valve (18) integrated in the valve block body; 8. The hydraulic system suitable for use in a wind power generator according to claim 1, characterized in that, The first stop valve (6) is connected between the oil path convergence node and the main shaft brake actuator, and the second stop valve (18) is connected between the oil port on the other side of the third electromagnetic valve (21) and the yaw brake actuator. The control valve block assembly (3) further comprises a fourth electromagnetic valve (23), a third stop valve (37) and a fourth stop valve (39) integrated in the valve block body; 9. The hydraulic system suitable for use in a wind power generator according to claim 2, characterized in that, The fourth electromagnetic valve (23) and the fourth stop valve (39) are connected in parallel with the first overflow valve (22), the oil port on one side of the fourth electromagnetic valve (23), the oil port on one side of the fourth stop valve (39) and the oil inlet of the first overflow valve (22) are connected and then connected to the working oil path; The third stop valve (37) is connected between the working oil path and the brake return oil path, and the third stop valve (37) is arranged in parallel between the fifth electromagnetic reversing valve (35) and the second overflow valve (38). The control valve block assembly (3) further comprises a proportional servo valve, a sixth pressure measuring connector (36), a seventh pressure measuring connector (45) and a fifth stop valve (46) integrated in the valve block body; 10. The hydraulic system suitable for use in a wind power generator according to claim 1, characterized in that, The proportional servo valve, the seventh pressure measuring connector (45) and the fifth stop valve (46) are arranged in sequence from upstream to downstream between the working oil path branch node and the oil inlet of the variable pitch actuator, and the sixth pressure measuring connector (36) is installed in the variable pitch return oil path. ​

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