Wind turbine high speed shaft fluid coupling
Patent Information
- Application Number
- CN202522467052.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-11-20
AI Technical Summary
[0008]本实用新型提供一种风电机组高速轴液力联轴器，用以解决现有技术中联轴器扭矩波动缓冲不足、过载保护有限，适配风电工况差的缺陷
[0019] This utility model provides a high-speed shaft hydraulic coupling for wind turbines, comprising: an input shaft assembly, an output shaft assembly, a hydraulic mechanism, and a pressure regulating energy storage device. The input shaft assembly is used to connect to the output shaft of a gearbox; the output shaft assembly is used to connect to the input shaft of a generator; the hydraulic mechanism includes a pump impeller, a turbine, and a housing, with the turbine rotatably mounted in the housing, the pump impeller and the housing forming a working chamber, the pump impeller being linked to the input shaft assembly, and the turbine being linked to the output shaft assembly; the pressure regulating energy storage device is disposed in the housing and communicates with the working chamber, used to regulate the pressure in the working chamber; the hydraulic mechanism of this utility model achieves flexible transmission through the liquid medium in the working chamber, the pump... With no rigid mechanical contact between the wheel and the turbine, it can effectively absorb torque fluctuations and high-frequency vibrations during wind turbine start-up, pitch changes, and wind speed variations. Compared to traditional rigid/flexible couplings, it can significantly reduce impact loads during transmission and structurally eliminate the generation of axial forces. This avoids wear on the gearbox output shaft, generator input shaft, and bearings caused by axial forces, extending the service life of shaft components. It also prevents damage to generator components due to sudden torque changes, reduces output power fluctuations, and improves power generation stability. Through the connection between the voltage regulation energy storage device and the working chamber, the pressure within the working chamber can be adjusted in real time, effectively protecting components such as the gearbox and generator.
Smart Images
Figure CN224665105U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coupling technology, and in particular to a high-speed shaft hydraulic coupling for wind turbine units. Background Technology
[0002] During the operation of a wind turbine, the high-speed shaft, as a key transmission component connecting the gearbox and the generator, must withstand frequent load fluctuations, impact torque, and speed changes.
[0003] Currently, the commonly used transmission devices for high-speed shafts of wind turbines are conventional rigid and flexible couplings, which are connected to elastic pins or elastic connectors through two flanges. This allows for a certain degree of misalignment and load reduction between the two elastic flanges, but it has the following drawbacks: Insufficient torque fluctuation buffering: Although the wind turbine's speed control through pitch adjustment keeps the speed of the gearbox output shaft from changing much, conventional rigid and flexible coupling designs still result in significant torque fluctuations during start-up, shutdown, and pitch adjustment, which can easily lead to damage to generator components and fluctuations in output power.
[0004] Limited overload protection: The load-bearing limit of the elastic element is fixed. During the start-up and shutdown of the wind turbine, the high-speed shaft is prone to sudden load changes. At this time, the elastic element is prone to permanent deformation or breakage, and cannot quickly cut off the power transmission, which may lead to damage to core components such as the gearbox and generator.
[0005] Insufficient buffering performance: High-speed shaft speeds are typically as high as 1500-3000 rpm, and there are impact vibrations during the start-up and shutdown phases. The elastic elements of conventional flexible couplings are prone to fatigue failure under the superposition of high-frequency vibration and impact loads, resulting in a short service life and requiring frequent shutdowns for replacement.
[0006] While existing hydraulic couplings have differential motion and overload protection functions, they are mostly used in thermal power, chemical and automotive industries. Their structural design does not take into account the load changes during the start-up and shutdown of high-speed wind turbine shafts, the need for alignment compensation, and the need for adaptability to harsh outdoor environments. Direct application of these couplings can easily lead to problems such as seal failure, excessively high oil temperature, excessive size, and difficulty in alignment.
[0007] Therefore, there is an urgent need to provide a special coupling for the high-speed shaft of wind turbine units that combines start-up and shutdown load buffering, reliable overload protection, and adaptability to wind power operating conditions. Utility Model Content
[0008] This utility model provides a high-speed shaft hydraulic coupling for wind turbines, which solves the defects of existing couplings such as insufficient torque fluctuation buffering, limited overload protection, and poor adaptability to wind power operating conditions.
[0009] This utility model provides a high-speed shaft hydraulic coupling for wind turbine generators, comprising: Input shaft assembly for connection to the output shaft of the gearbox; Output shaft assembly for connection to the input shaft of the generator; A hydraulic mechanism includes a pump impeller, a turbine, and a housing. The turbine is rotatably disposed in the housing. The pump impeller and the housing enclose a working chamber. The pump impeller is linked to an input shaft assembly, and the turbine is linked to an output shaft assembly. A pressure regulating energy storage device is installed in the housing and communicates with the working chamber, and is used to regulate the pressure of the working chamber.
[0010] According to the high-speed shaft hydraulic coupling of the wind turbine provided by this utility model, the pressure regulating energy storage device includes: An accumulator container has a liquid injection port at its first end, and the accumulator container is connected to the working chamber through the liquid injection port; A piston is movably disposed in the accumulator container for dynamically adjusting the pressure in the working chamber, and one end of the piston is connected to the working chamber; A spring is disposed inside the accumulator container, and the spring abuts against the end of the piston away from the working chamber, for dynamically buffering pressure fluctuations in the working chamber through elastic deformation.
[0011] The high-speed shaft hydraulic coupling for wind turbines provided by this utility model further includes: An overflow port is provided on the accumulator container, which is used to release pressure when the pressure in the working chamber exceeds a preset value by moving the piston to the overflow port position. A pressure adjusting bolt is located at the second end of the accumulator container, and the pressure adjusting bolt abuts against the other end of the spring.
[0012] According to the high-speed shaft hydraulic coupling of the wind turbine provided by this utility model, both the pump wheel and the turbine are provided with radially distributed blades, and the forward tilt angle of the blades is between 15° and 25°.
[0013] According to the high-speed shaft hydraulic coupling for wind turbines provided by this utility model, the input shaft assembly includes: An input shaft flange, one end of which is connected to the high-speed shaft of the gearbox, and the other end of which is connected to the housing of the pump wheel.
[0014] According to the high-speed shaft hydraulic coupling of the wind turbine provided by this utility model, the pump wheel and the housing are connected by bolts, and a sealing ring is provided at the connection between the pump wheel and the housing.
[0015] According to the high-speed shaft hydraulic coupling for wind turbines provided by this utility model, the output shaft assembly includes: The turbine is connected to the output shaft, and one end of the output shaft is connected to the input shaft of the generator. The other end passes through the housing and is rotatably connected to the pump wheel through a first bearing. The output shaft is rotatably connected to the housing through a second bearing.
[0016] According to the high-speed shaft hydraulic coupling of the wind turbine provided by this utility model, a shaft end sealing ring is provided at the shaft end where the output shaft meets the housing.
[0017] The high-speed shaft hydraulic coupling for wind turbine provided by this utility model also includes an output shaft flange, one end of which is connected to the output shaft and the other end of which is connected to the input shaft of the generator.
[0018] The high-speed shaft hydraulic coupling of the wind turbine provided by this utility model also includes a braking device, which is disposed on the high-speed shaft of the gearbox and includes a brake disc and a brake caliper. The brake disc is used to reduce the speed by means of the brake caliper when overloaded or overspeeding.
[0019] This utility model provides a high-speed shaft hydraulic coupling for wind turbines, comprising: an input shaft assembly, an output shaft assembly, a hydraulic mechanism, and a pressure regulating energy storage device. The input shaft assembly is used to connect to the output shaft of a gearbox; the output shaft assembly is used to connect to the input shaft of a generator; the hydraulic mechanism includes a pump impeller, a turbine, and a housing, with the turbine rotatably mounted in the housing, the pump impeller and the housing forming a working chamber, the pump impeller being linked to the input shaft assembly, and the turbine being linked to the output shaft assembly; the pressure regulating energy storage device is disposed in the housing and communicates with the working chamber, used to regulate the pressure in the working chamber; the hydraulic mechanism of this utility model achieves flexible transmission through the liquid medium in the working chamber, the pump... With no rigid mechanical contact between the wheel and the turbine, it can effectively absorb torque fluctuations and high-frequency vibrations during wind turbine start-up, pitch changes, and wind speed variations. Compared to traditional rigid / flexible couplings, it can significantly reduce impact loads during transmission and structurally eliminate the generation of axial forces. This avoids wear on the gearbox output shaft, generator input shaft, and bearings caused by axial forces, extending the service life of shaft components. It also prevents damage to generator components due to sudden torque changes, reduces output power fluctuations, and improves power generation stability. Through the connection between the voltage regulation energy storage device and the working chamber, the pressure within the working chamber can be adjusted in real time, effectively protecting components such as the gearbox and generator. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the connection structure between the gearbox and the generator via a coupling provided in this embodiment of the utility model.
[0022] Figure 2 This is a schematic diagram of the structure of a high-speed shaft hydraulic coupling for a wind turbine provided in an embodiment of this utility model.
[0023] Figure label: 1. Pump impeller; 2. Turbine; 3. Housing; 4. Pressure regulating energy storage device; 41. Energy storage container; 42. Injection port; 43. Piston; 44. Spring; 45. Pressure adjusting bolt; 5. Gearbox; 6. Generator; 7. Input shaft flange; 8. Sealing ring; 9. Output shaft; 10. First bearing; 11. Second bearing; 12. Shaft end sealing ring; 13. Output shaft flange; 14. Brake disc. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0025] The following is combined Figures 1-2 This utility model describes a high-speed shaft hydraulic coupling for wind turbine units.
[0026] like Figures 1-2 As shown, this utility model embodiment provides a high-speed shaft hydraulic coupling for a wind turbine, including: an input shaft assembly, an output shaft assembly, a hydraulic mechanism, and a pressure regulating energy storage device 4. The input shaft assembly is used to connect to the output shaft 9 of the gearbox 5; the output shaft assembly is used to connect to the input shaft of the generator 6; the hydraulic mechanism includes a pump wheel 1, a turbine 2, and a housing 3. The turbine 2 is rotatably disposed in the housing 3, and the pump wheel 1 and the housing 3 enclose a working chamber. The pump wheel 1 is linked to the input shaft assembly, and the turbine 2 is linked to the output shaft assembly; the pressure regulating energy storage device 4 is disposed in the housing 3 and communicates with the working chamber for regulating the pressure in the working chamber.
[0027] In operation, the output shaft 9 of the gearbox 5 of the wind turbine drives the input shaft assembly to rotate. The input shaft assembly drives the pump wheel 1 and the housing 3 to rotate together. When the pump wheel 1 rotates, the blades of the pump wheel 1 drive the liquid in the working chamber to rotate. The rotating liquid drives the turbine 2 to rotate through the blades of the turbine 2. The turbine 2 drives the output shaft 9 assembly to rotate. There is no axial force transmission in the whole process, which ultimately drives the generator 6 to work. When the wind turbine starts or stops or the wind speed increases, the liquid pressure in the working chamber also increases. By setting up a pressure regulating energy storage device 4, the liquid in the working chamber flows into the pressure regulating energy storage device 4 to dynamically adjust the pressure in the working chamber, thereby reducing the pressure in the working chamber and ensuring that the turbine 2 rotates smoothly, so that the output speed of the generator 6 is stable at the rated value.
[0028] As can be seen from the above scheme, the hydraulic mechanism of this utility model achieves flexible transmission through the liquid medium in the working chamber. The pump wheel 1 and the turbine 2 have no mechanical rigid contact, which can effectively absorb torque fluctuations and high-frequency vibrations during the start-up, pitching, and wind speed changes of the wind turbine. Compared with the traditional rigid / flexible coupling, it can significantly reduce the impact load during the transmission process and eliminate the generation of axial force from the structure. This can avoid the wear of the output shaft 9 of the gearbox 5, the input shaft of the generator 6, and the bearings caused by the axial force, extend the service life of the shaft components, and prevent the generator 6 components from being damaged due to sudden torque changes. At the same time, it reduces the fluctuation of output power and improves the stability of power generation. Through the connection between the pressure regulating energy storage device 4 and the working chamber, the pressure in the working chamber can be adjusted in real time, effectively protecting the gearbox 5, generator 6, and other components.
[0029] In this embodiment, the pressure regulating energy storage device 4 includes: an energy storage container 41, a piston 43, and a spring 44. The first end of the energy storage container 41 is provided with an injection port 42, and the energy storage container 41 is connected to the working chamber through the injection port 42. The piston 43 is movably disposed in the energy storage container 41 for dynamically adjusting the pressure in the working chamber, and one end of the piston 43 is connected to the working chamber. The spring 44 is disposed inside the energy storage container 41, and the spring 44 abuts against the end of the piston 43 away from the working chamber, for dynamically buffering pressure fluctuations in the working chamber through elastic deformation. During operation, the spring 44 acts directly on the piston 43 through elastic deformation. When pressure fluctuations occur in the working chamber due to changes in wind speed or start-stop operations, the piston 43 can move in real time with the pressure changes. The elastic force of the spring 44 is dynamically balanced with the pressure in the working chamber, achieving continuous pressure regulation and avoiding the impact of sudden torque changes on the generator 6 and gearbox 5.
[0030] With this configuration, the pressure fluctuations in the working chamber can be adjusted through the voltage regulating energy storage device 4, avoiding the impact of sudden torque changes on the generator 6 and gearbox 5. The elastic buffering effect of the spring 44 can absorb the instantaneous pressure in the working chamber, reducing the impact of sudden pressure changes on the sealing structure, bearings and other components of the working chamber, ensuring a smooth pressure drop in the working chamber. The entire voltage regulating energy storage device 4 is a purely mechanical structure without electrical components, sensors or complex hydraulic control circuits. Moreover, the energy storage container 41 is a sealed structure, which can effectively isolate the wind turbine from outdoor sand and water vapor, extend the service life of the voltage regulating energy storage device 4 and reduce maintenance costs. By replacing the springs 44 with different stiffnesses, the preset pressure value of the working chamber can be flexibly adjusted. It can be adapted to wind turbines with different rated power without modifying the overall structure, improving the versatility and adaptability of the device.
[0031] Optionally, the accumulator container 41 is mounted on the housing 3 by means of bolts.
[0032] Furthermore, it also includes: an overflow port and a pressure regulating bolt 45. The overflow port is provided on the accumulator container 41 and is used to release pressure when the pressure in the working chamber exceeds a preset value by moving the piston 43 to the overflow port position. The pressure regulating bolt 45 is provided at the second end of the accumulator container 41 and abuts against the other end of the spring 44.
[0033] Optionally, the pressure adjusting bolt 45 can be used to adjust the pressure parameters on-site with a conventional wrench, and the overflow port is equipped with a removable sealing cap for easy periodic cleaning of impurities and prevention of blockage.
[0034] During operation, the axial position of the pressure adjusting bolt 45 at the second end of the accumulator container 41 is adjusted by rotating the bolt, thereby compressing or releasing the spring 44 and adjusting the initial elastic force of the spring 44 to the safe pressure threshold of the working chamber. At this time, under the action of the spring force of the spring 44, the piston 43 is in the initial position of the accumulator container 41 near the liquid injection port 42, and the overflow port is closed. When the wind turbine is running smoothly, the pressure of the liquid medium in the working chamber is stable, the piston 43 is balanced by forces, and remains stationary. When the pressure in the working chamber fluctuates slightly, the pressure is transmitted to the end face of the piston 43 through the liquid injection port 42, pushing the piston 43 to move slightly. The spring 44 undergoes elastic deformation simultaneously, dynamically offsetting the pressure fluctuation. To maintain stable working chamber pressure; when encountering gusts of wind or sudden load changes that cause a rapid increase in working chamber pressure, the pressure exceeds the initial elastic force of spring 44, pushing piston 43 to move away from injection port 42, and spring 44 is further compressed to avoid pressure changes causing impact on working chamber seals, bearings and other components; when working chamber pressure exceeds a preset safety threshold, piston 43 continues to move with the pressure until its end face passes the overflow port position, and the working chamber is connected to the outside through the overflow port, and the high-pressure liquid medium is quickly discharged to achieve pressure relief. During the pressure relief process, spring 44 gradually rebounds, assisting piston 43 to reset, until the working chamber pressure drops to a safe range, and the overflow port is closed by piston 43 again.
[0035] In this embodiment, a braking device is also included, which is disposed on the high-speed shaft of the gearbox 5. The device includes a brake disc 14 and a brake caliper. The brake disc 14 is connected to the high-speed shaft of the gearbox 5 via a spline. The brake disc 14 is used to reduce the speed by braking the brake caliper when overloaded or overspeeding. The brake caliper clamps the brake disc 14 by hydraulically driving the brake pads, and forcibly reduces the speed of the high-speed shaft of the gearbox 5 by using friction. When the fan is overloaded or overspeeding, the braking device will be activated to reduce the speed by braking the output shaft 9 of the gearbox 5.
[0036] In this embodiment, both the pump impeller 1 and the turbine 2 are provided with radially distributed blades, and the forward tilt angle of the blades is between 15° and 25°. The radially distributed blades can form a uniform annular liquid flow in the working chamber. When the pressure fluctuates, the force of the liquid flow on the piston 43 is more stable. Combined with the forward tilt angle of 15°-25°, the pump impeller 1 can more efficiently convert mechanical energy into liquid kinetic energy when rotating, reducing the energy loss when the liquid flow impacts the blades of the turbine 2. Compared with straight blades or backward tilted blades, the forward tilted structure can reduce the separation phenomenon of liquid flow on the blade surface, avoid the generation of eddies, and ensure the continuity of power transmission.
[0037] In some embodiments, the pump wheel 1 and turbine 2 are made of ZG35CrMo material, with 26 blades, a forward tilt angle of 20°, and the working chamber uses L-TSA46D oily liquid. The accumulator volume is 0.5L, and the overflow valve opening pressure is 1.8MPa.
[0038] In this embodiment, the input shaft assembly includes an input shaft flange 7. One end of the input shaft flange 7 is connected to the high-speed shaft of the gearbox 5 via a key, and the other end is connected to the housing of the pump wheel 1 via a key.
[0039] like Figure 2 As shown, the pump wheel 1 is connected to the housing 3 by bolts, and a sealing ring 8 is provided at the connection between the pump wheel 1 and the housing 3 to prevent liquid leakage in the working chamber.
[0040] In some embodiments, the output shaft 9 assembly includes an output shaft 9, the turbine 2 is connected to the output shaft 9, for example, by shoulder positioning and key connection; and one end of the output shaft 9 is connected to the input shaft of the generator 6, the other end passes through the housing 3 and is rotatably connected to the pump wheel 1 by the first bearing 10, and the output shaft 9 is rotatably connected to the housing 3 by the second bearing 11.
[0041] Furthermore, it also includes an output shaft flange 13, one end of which is connected to the output shaft 9, and the other end is connected to the input shaft of the generator 6. For example, one end of the output shaft flange 13 is circumferentially fixed to the output shaft 9 by a flat key, and the other end is detachably connected to the flange of the input shaft of the generator 6 by circumferentially distributed bolts.
[0042] Furthermore, a shaft end sealing ring 12 is provided at the shaft end where the output shaft 9 mates with the housing 3.
[0043] The high-speed shaft hydraulic coupling for wind turbines provided by this utility model has the following advantages compared with the prior art: 1. The hydraulic mechanism can automatically adjust the pressure in the working chamber by preset pressure threshold through the pressure regulating energy storage device 4, so that the load peak during the start-up and shutdown of the wind turbine is reduced by more than 40%, which significantly alleviates the start-up and shutdown impact; using oily liquid as the power transmission medium, the pump wheel 1 and the turbine 2 have no direct mechanical contact, which completely eliminates shear force and friction loss in the transmission process, and extends the service life of core components by more than 30%.
[0044] 2. It integrates a triple-protection mechanism of hydraulic overload pressure regulation, overspeed pressure relief, and high-speed shaft braking, with an overall response time of ≤0.3s. It can quickly respond to risk scenarios such as extreme wind conditions, sudden load changes, and mechanical failures, effectively avoiding damage to components such as gearbox 5 and generator 6, and significantly improving the safety and stability of wind turbine operation.
[0045] 3. Adaptable to complex working conditions such as wind turbine tower swaying and load fluctuations, the liquid medium in the working chamber not only undertakes the power transmission function, but also carries away the heat generated by the operation of the hydraulic mechanism during the circulation process, achieving a self-cooling effect. No additional cooling device is required, which simplifies the structure and avoids the failure of the hydraulic mechanism due to high temperature, ensuring the long-term stable operation of the equipment in harsh outdoor environments.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A high-speed shaft hydraulic coupling for wind turbine generators, characterized in that, include: An input shaft assembly for connecting to the output shaft (9) of the gearbox (5); Output shaft (9) assembly for connection to the input shaft of generator (6); The hydraulic mechanism includes a pump wheel (1), a turbine (2) and a housing (3). The turbine (2) is rotatably disposed in the housing (3). The pump wheel (1) and the housing (3) enclose a working chamber. The pump wheel (1) is linked to the input shaft assembly, and the turbine (2) is linked to the output shaft (9) assembly. A pressure regulating energy storage device (4) is installed in the housing (3) and communicates with the working chamber to regulate the pressure of the working chamber.
2. The high-speed shaft hydraulic coupling for wind turbines according to claim 1, characterized in that, The voltage regulation energy storage device (4) includes: An accumulator container (41) is provided with a liquid injection port (42) at its first end, and the accumulator container (41) is connected to the working chamber through the liquid injection port (42); A piston (43) is movably disposed in the accumulator container (41) for dynamically adjusting the pressure in the working chamber, and one end of the piston (43) is connected to the working chamber; A spring (44) is disposed inside the energy storage container (41). The spring (44) abuts against the end of the piston (43) away from the working chamber and is used to dynamically buffer the pressure fluctuations of the working chamber through elastic deformation.
3. The high-speed shaft hydraulic coupling for wind turbines according to claim 2, characterized in that, Also includes: An overflow port is provided on the accumulator container (41) for the piston (43) to move to the overflow port position to release pressure when the pressure in the working chamber exceeds a preset value; A pressure adjusting bolt (45) is provided at the second end of the accumulator container (41), and the pressure adjusting bolt (45) abuts against the other end of the spring (44).
4. The high-speed shaft hydraulic coupling for wind turbines according to any one of claims 1-3, characterized in that, Both the pump wheel (1) and the turbine (2) are provided with radially distributed blades, and the forward tilt angle of the blades is between 15° and 25°.
5. The high-speed shaft hydraulic coupling for wind turbines according to claim 4, characterized in that, The input shaft assembly includes: Input shaft flange (7), one end of which is connected to the high-speed shaft of the gearbox (5), and the other end is connected to the housing of the pump wheel (1).
6. The high-speed shaft hydraulic coupling for wind turbines according to claim 5, characterized in that, The pump wheel (1) is bolted to the housing (3), and a sealing ring (8) is provided at the connection between the pump wheel (1) and the housing (3).
7. The high-speed shaft hydraulic coupling for wind turbines according to claim 4, characterized in that, The output shaft (9) assembly includes: The output shaft (9) is connected to the turbine (2), and one end of the output shaft (9) is connected to the input shaft of the generator (6), and the other end passes through the housing (3) and is rotatably connected to the pump wheel (1) through the first bearing (10). The output shaft (9) is rotatably connected to the housing (3) through the second bearing (11).
8. The high-speed shaft hydraulic coupling for wind turbines according to claim 7, characterized in that, The output shaft (9) is provided with a shaft end seal ring (12) at the shaft end of the housing (3).
9. The high-speed shaft hydraulic coupling for wind turbines according to claim 7, characterized in that, It also includes an output shaft flange (13), one end of which is connected to the output shaft (9), and the other end is connected to the input shaft of the generator (6).
10. The high-speed shaft hydraulic coupling for wind turbines according to claim 4, characterized in that, It also includes a braking device, which is installed on the high-speed shaft of the gearbox (5), including a brake disc (14) and a brake caliper. The brake disc (14) is used to reduce the speed by means of the brake caliper when overloaded or overspeeding.