Hydraulic slip rings and wind turbine units

Abstract

This utility model provides a hydraulic slip ring and a wind turbine generator set. The hydraulic slip ring includes a slip ring body, a transition plate, and a connector. The slip ring body has a flow path, the transition plate is disposed on the slip ring body, and the connector is disposed on the transition plate, communicating with the flow path. By placing the transition plate on the slip ring body and the connector on the transition plate, the transition plate connected to the end of the slip ring body can be considered an extension of the slip ring body. Placing the connector on the transition plate effectively increases the contact area between the connector and the slip ring body, reduces the local stress peak at the connection point, decreases the possibility of fatigue fracture due to hydraulic oil pulsation, and improves the reliability of the connection between the hydraulic slip ring and the hydraulic pump station.

Description

Technical Field

[0001] This utility model relates to the field of wind power technology, and in particular to a hydraulic slip ring and a wind turbine generator set. Background Technology

[0002] Wind turbines, as an important component of renewable energy, are widely used in power generation around the world. Hydraulic slip rings, as a core component of wind turbines, primarily function to establish a continuous oil channel between the wind turbine's hydraulic pump station and the wind turbine's pitch system. This allows hydraulic oil from the pump station to be continuously transferred to the pitch system, which rotates with the wind turbine, thereby driving the turbine to adjust the pitch angle.

[0003] To connect hydraulic slip rings to the hydraulic pump station of wind turbines, related technologies typically incorporate threaded structures on the slip rings to connect them to hydraulic pipelines. However, as the slip rings rotate and the wind turbine pitches, the hydraulic oil within the pipelines exhibits periodic rotation and pulsating motion. This pulsating motion creates rotational and high-frequency pulse fatigue loads at the connection between the slip ring and the pipeline, ultimately leading to fatigue fracture at this connection and causing oil leakage in the wind turbine. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic slip ring and a wind turbine, aiming to solve the problem that the connection between the hydraulic slip ring and the hydraulic pipeline is prone to breakage in related technologies.

[0005] To solve the above-mentioned technical problems, in a first aspect, embodiments of the present invention provide a hydraulic slip ring, the hydraulic slip ring comprising: A slip ring body having a flow path; A transition plate is disposed on the slip ring body; A connector is provided on the transition plate and is connected to the flow path.

[0006] Optionally, the slip ring body is provided with a limiting part, which is used to restrict the transition plate from moving radially along the slip ring body.

[0007] Optionally, the slip ring body includes a body portion, and the limiting portion includes an annular protrusion, which is disposed on the body portion; The transition plate is connected to the main body, and the annular protrusion surrounds the outside of the transition plate.

[0008] Optionally, the transition plate is detachably connected to the slip ring body.

[0009] Optionally, the transition plate is provided with mounting holes, and the mounting holes are provided with mating parts; The connector is disposed in the mounting hole, and the connector is provided with a fixing part, which is used to cooperate with the mating part to fix the connector in the mounting hole.

[0010] Optionally, the mating part includes an annular groove, which is located on the side of the mounting hole near the slip ring body; the limiting part includes a protrusion, which is located in the annular groove and contacts the end face of the slip ring body.

[0011] Optionally, the transition plate is provided with mounting holes, and the connector is disposed in the mounting holes; The inner wall of the mounting hole is provided with an anti-rotation structure, which is used to cooperate with the outer peripheral surface of the connector to restrict the circumferential rotation of the connector.

[0012] Optionally, the slip ring body has a receiving groove on the side facing the transition plate, the receiving groove is connected to the flow path, and the connector is at least partially located in the receiving groove.

[0013] Optionally, the wall of the receiving groove is provided with a sealing groove, and the hydraulic slip ring further includes a sealing element; The outer ring of the seal is located inside the sealing groove, and the inner ring of the seal is fitted outside the joint.

[0014] Secondly, embodiments of this utility model also provide a wind turbine generator set, which includes a hydraulic slip ring, the hydraulic slip ring comprising: A slip ring body having a flow path; A transition plate is disposed on the slip ring body; A connector is provided on the transition plate and is connected to the flow path.

[0015] This application addresses this issue by placing a transition plate on the slip ring body and a connector on the transition plate. This arrangement offers several advantages. First, the transition plate, connected to the end of the slip ring body, can be considered an extension of the slip ring body. Placing the connector on the transition plate effectively increases the contact area between the connector and the slip ring body, reducing the local stress peak at the connection point and decreasing the likelihood of fatigue fracture due to hydraulic oil pulsation. This improves the reliability of the connection between the hydraulic slip ring and the hydraulic pump station. Second, compared to the slip ring body, the transition plate has a lower manufacturing cost. When the transition plate experiences sealing surface wear or local cracks under long-term fatigue loads, maintenance personnel only need to replace the transition plate to repair the hydraulic slip ring, avoiding the need to scrap the entire slip ring body and reducing maintenance costs. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is a schematic diagram of an embodiment of the hydraulic slip ring provided in this application; Figure 2 for Figure 1 Assembly diagram of the hydraulic slip ring and transition plate; Figure 3 for Figure 1 Side view of the connector; Figure 4 for Figure 1 Side view of the intermediate transition plate.

[0018] Explanation of reference numerals in the accompanying drawings of this utility model: 1000-Hydraulic slip ring; 1-Slip ring body, 1a-Stator part, 11-Flow path, 11a-First flow path, 11b-Second flow path, 12-Limiting part, 12a-Annular protrusion, 13-Accommodation groove, 131-Sealing groove; 2-Transition plate, 21-Mounting hole, 211-Matching part, 211a-Annular groove, 212-Anti-rotation structure, 212a-First plane; 3-Connector, 31-Connector body, 311-Second plane, 32-Fixing part, 32a-Protrusion, 33-Connecting flow channel, 331-First mating slope; 4-Fasteners, 5-Hydraulic lines, 51-Second mating bevel, 6-Seals, 7-Sealing sleeves.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This application proposes a wind turbine generator, which includes a tower and a nacelle. The tower serves as the support structure for the wind turbine generator, supporting and connecting the nacelle and various wind power platforms. In some embodiments, the tower includes multiple tower units stacked on top of each other and connected by anchor bolts to form the tower. The lengths of the tower units can be the same or different, and this application does not impose any limitation on this.

[0024] The nacelle is located at the top of the tower and is used to convert wind energy into electrical energy. In some embodiments, the nacelle includes: the nacelle body, a hydraulic pump station, a generator, and a wind turbine; the nacelle body is connected to the tower and serves as the main structural component of the nacelle, accommodating and connecting the various system assemblies of the nacelle.

[0025] The hydraulic pump station is located inside the nacelle and is connected to the hydraulic actuator of the wind turbine. The hydraulic pump station is used to provide hydraulic pressure to the hydraulic actuator inside the wind turbine to drive the movement of the hydraulic actuator.

[0026] The hydraulic actuator can be a pitch cylinder that drives the pitch angle to change, a brake caliper that realizes main shaft braking or rotor braking, or a braking device that controls yaw braking. This application does not limit the scope of the application.

[0027] The wind turbine is connected to a generator. The wind turbine captures wind energy and converts it into mechanical energy to drive the generator to produce electrical energy. In some embodiments, the wind turbine includes a hub, blades, and a pitch system, wherein the hub is used to mount the blades and is connected to the power input shaft of the generator; the blades are used to receive wind energy and generate lift to drive the hub to rotate.

[0028] The pitch system is connected to a hydraulic pump station and, driven by hydraulic oil supplied by the pump station, rotates the blades, thereby adjusting the blade pitch angle and thus regulating the rotor speed and power output. In some embodiments, the pitch system includes a hydraulic cylinder, a linkage mechanism, and a pitch bearing. The hydraulic cylinder is connected to the hydraulic pump station and can perform linear telescopic motion under the drive of the hydraulic pump. The linkage mechanism connects the hydraulic cylinder and the blades to convert the linear motion of the hydraulic cylinder into the rotational motion of the blades. The pitch bearing is located between the rotor hub and the rotor blades. In practical applications, the hydraulic pump station supplies hydraulic oil to the hydraulic cylinder to drive it in linear telescopic motion. The linkage mechanism converts the linear motion of the hydraulic cylinder into rotational motion and drives the blades to rotate around the pitch bearing, thereby changing the blade pitch angle and regulating the rotor speed and power output.

[0029] To connect the hydraulic pump station and the pitch system, the nacelle also includes a hydraulic slip ring. The hydraulic pump station is connected to the hydraulic slip ring through hydraulic pipelines. The hydraulic slip ring is used to establish a continuous oil channel between the hydraulic pump station and the pitch system, so that the hydraulic oil from the hydraulic pump station can be continuously transmitted to the pitch system that rotates with the wind turbine, thereby driving the wind turbine to adjust the pitch angle.

[0030] For details, please refer to Figure 1 and Figure 2 The hydraulic slip ring 1000 includes a slip ring body 1, which includes a stator part 1a and a rotor part (not shown in the figure). The stator part 1a is connected to the nacelle body, and the rotor part is connected to the hub of the wind turbine and can rotate relative to the stator part 1a under the drive of the wind turbine hub.

[0031] In some embodiments, a bearing is also provided between the stator section 1a and the rotor section. The bearing can be a deep groove ball bearing, a cylindrical roller bearing, an angular contact ball bearing, or a crossed roller bearing, etc., and this application is not limited to these. The outer ring of the bearing is connected to the stator section 1a, and the inner ring of the bearing is connected to the rotor section. In this way, while keeping the stator section 1a stationary, the rotor section is allowed to rotate with the hub and withstand radial, axial, and overturning moment loads, ensuring the coaxiality and sealing reliability of the hydraulic slip ring 1000 during rotation.

[0032] The slip ring body 1 is also provided with a flow path 11. In some embodiments, the flow path 11 includes an oil inlet channel provided in the stator section 1a, an oil outlet channel provided in the rotor section, and a rotary seal interface located between the stator section 1a and the rotor section. The inlet channel is connected to the hydraulic pump station, and the outlet channel is connected to the hydraulic cylinder of the pitch system. The hydraulic oil can reach the inlet channel through the hydraulic pump station, and then reach the hydraulic cylinder through the inlet channel, the rotary seal interface, and the outlet channel, thereby driving the hydraulic cylinder to move.

[0033] The flow path 11 can be provided as one or more, and this application does not limit this. Exemplarily, the slip ring body 1 includes a first flow path 11a and a second flow path 11b. The first flow path 11a is a high-pressure flow path, used to connect the high-pressure outlet of the hydraulic pump station to the hydraulic cylinder inlet chamber of the pitch system, so as to continuously deliver the high-pressure oil generated by the engine room hydraulic pump station to the pitch system through the rotor of the hydraulic slip ring 1000 to drive the hydraulic cylinder. The second flow path 11b is a low-pressure flow path, connecting the hydraulic cylinder return chamber of the pitch system to the hydraulic oil tank, so as to return the completed return oil to the engine room oil tank to maintain the pressure balance of the hydraulic pump station.

[0034] To enable the hydraulic slip ring 1000 to connect to the hydraulic pump station, the hydraulic slip ring 1000 also includes a connector 3 and a hydraulic pipeline 5. The connector 3 is connected to the hydraulic slip ring 1000, and the connector 3 has a connecting flow channel 33. The connecting flow channel 33 of the connector 3 is connected to the flow path 11 of the slip ring body 1. The outer diameter of the connector is referenced to the outer diameter of the standard SAE connector, and the outer diameter of the customized connector is calculated according to the load to ensure that the clamping area of ​​the connector is larger than that of the standard SAE connector. One end of the hydraulic pipeline 5 is connected to the hydraulic pump station, and the other end is inserted into the connecting flow channel 33 of the connector 3 to connect to the hydraulic slip ring 1000.

[0035] To improve the sealing performance between the connector 3 and the hydraulic pipeline 5, in some embodiments, a first mating inclined surface 331 is provided in the connecting flow channel 33 of the connector 3, and a second mating inclined surface 51 is provided on the outer circumferential surface of the pipeline. The first mating inclined surface 331 and the second mating inclined surface 51 fit together and form a seal, thereby reducing the connection gap between the pipeline and the connector 3, improving the sealing performance between the connector 3 and the pipeline, and reducing the possibility of hydraulic oil leakage between the connector 3 and the pipeline.

[0036] In some embodiments, the hydraulic slip ring 1000 further includes a sealing sleeve 7. The sealing strip is sleeved outside the connection between the connector 3 and the pipeline. The sealing sleeve 7 is used to form an additional radial covering seal on the outer periphery of the connector and the hydraulic pipeline 5. It can compensate for the micro-unevenness that may exist on the first mating slope 331 and the second mating slope 51, prevent hydraulic oil from seeping out along the outer wall, and limit the relative vibration between the connector 3 and the hydraulic pipeline 5. This further reduces the leakage risk of the connector 3 and the hydraulic pipeline 5 and improves the sealing reliability of the connection between the connector 3 and the hydraulic pipeline 5 under rotating conditions.

[0037] Related technologies typically incorporate threaded structures on hydraulic slip rings to connect them to hydraulic pipelines. However, as the hydraulic slip ring rotates and the wind turbine pitches, the hydraulic oil within the pipelines exhibits periodic rotation and pulsating motion. This pulsating motion creates rotational and high-frequency pulsating fatigue loads at the connection between the hydraulic slip ring and the hydraulic pipeline, ultimately leading to fatigue fracture at this connection and causing oil leakage in the wind turbine.

[0038] To address the aforementioned issues, this application further includes a transition plate 2 in the hydraulic slip ring 1000. The transition plate 2 is located on the slip ring body 1, and the connector 3 is located on the transition plate 2. This arrangement serves two purposes: First, the transition plate 2, connected to the end of the slip ring body 1, can be considered an extension of the slip ring body 1. By placing the connector 3 on the transition plate 2, the contact area between the connector 3 and the slip ring body 1 is effectively increased, reducing the local stress peak at the connection point and decreasing the likelihood of fatigue fracture due to hydraulic oil pulsation. This improves the reliability of the connection between the hydraulic slip ring 1000 and the hydraulic pump station. Second, compared to the slip ring body 1, the transition plate 2 has a lower manufacturing cost. When the transition plate 2 experiences sealing surface wear or local cracks under long-term fatigue loads, maintenance personnel only need to replace the transition plate 2 to complete the maintenance of the hydraulic slip ring 1000, thus avoiding the scrapping of the entire slip ring body 1 and reducing the maintenance cost of the hydraulic slip ring 1000.

[0039] The transition plate 2 can be fixed to the slip ring body 1 or snapped onto the slip ring body 1. This application does not limit this. For example, the stator portion 1a of the slip ring body 1 is provided with a through hole, and the transition plate 2 is provided with a threaded hole. The hydraulic slip ring 1000 also includes a fastener 4, which can be a screw or a bolt. This application does not limit this. The fastener 4 passes through the through hole of the stator portion 1a and extends into the threaded hole of the connecting plate to achieve a detachable connection between the transition plate 2 and the slip ring body 1. In this way, when the transition plate 2 experiences wear on the sealing surface or local cracks under long-term fatigue load, the maintenance personnel only need to loosen the threads to remove the transition plate 2 from the slip ring body 1 and replace it. Thus, the maintenance of the hydraulic slip ring 1000 can be completed without replacing the slip ring body 1, reducing the maintenance cost of the hydraulic slip ring 1000.

[0040] Understandably, in some other possible implementations, the transition plate 2 can also be connected to the slip ring body 1 by snap-fit ​​or magnetic connection, and this application does not limit this.

[0041] In some embodiments, the slip ring body 1 is provided with a limiting part 12, which is used to restrict the transition plate 2 from moving radially along the slip ring body 1. This ensures the coaxiality of the transition plate 2 and the slip ring body 1 after assembly, improves the coaxiality of the connecting flow channel of the connector 3 and the flow path 11 inside the slip ring body 1, reduces the installation difficulty of the connector 3 between the transition plate 2 and the slip ring body 1, and improves the assembly efficiency of the hydraulic slip ring 1000.

[0042] The structure of the limiting part 12 can be varied. In some embodiments, the stator part 1a of the slip ring body 1 includes the body part, and the limiting part 12 includes an annular protrusion 12a. The annular protrusion 12a is provided on the body part, and the transition plate 2 is connected to the body part. The annular protrusion 12a surrounds the outside of the transition plate 2. In this way, radial constraint is provided for the assembly of the transition plate 2 on the slip ring body 1, thereby ensuring the coaxiality of the transition plate 2 and the slip ring body 1 after assembly and reducing the assembly difficulty of the transition plate 2 and the slip ring body 1.

[0043] The limiting part 12 can also be a radially distributed pin along the circumference, a positioning key embedded in the end face of the main body, or a notch opened on the outer edge of the transition plate 2 and a corresponding boss of the main body. Compared with these positioning methods that require additional machining of holes, slots or additional parts, setting the limiting part 12 as an annular protrusion 12a can be formed in one turning, without the need for additional fasteners 4. This reduces machining time and assembly steps, and avoids the risk of loosening that may be caused by separate positioning parts, thereby reducing the manufacturing cost of the hydraulic slip ring 1000.

[0044] To enable the installation of the connector 3 and the transition plate 2, in some embodiments, the transition plate 2 is provided with a mounting hole 21, the mounting hole 21 is provided with a mating part 211, the connector 3 is provided in the mounting hole 21, and the connector 3 is provided with a fixing part 32, which is used to cooperate with the mating part 211 to fix the connector 3 in the mounting hole 21.

[0045] The structure of the fixing part 32 and the mating part 211 can be varied. The fixing part 32 and the mating part 211 can be internal or external threads, or they can be snap-fit ​​or slotted. They can also be magnetic structures; this application does not impose any limitations on these aspects. In some embodiments, the mating part 211 includes an annular groove 211a, which is located near the slip ring body 1 in the mounting hole 21. The connector 3 includes a connector body 31 with a mounting hole 21. The fixing part 32 includes a protrusion 32a located in the connector body 31. An annular protrusion 12a is located within the annular groove 211a and contacts the end face of the slip ring body 1. Thus, the axial positioning and radial limiting of the connector 3 are achieved through the engagement of the annular protrusion 12a with the annular groove 211a, preventing axial movement or radial displacement of the connector 3 under hydraulic pulsation or impeller rotation, and improving the stability of the connection between the connector 3 and the transition plate 2.

[0046] Please refer to Figure 3 and Figure 4 In some embodiments, the inner wall surface of the mounting hole 21 is provided with an anti-rotation structure 212. The anti-rotation structure 212 is used to cooperate with the outer peripheral surface of the joint 3 to restrict the circumferential rotation of the joint 3. In this way, it is ensured that when the slip ring body 1 rotates, the joint 3 can only rotate with the slip ring body 1 and will not rotate on its own, thereby improving the stability of the connection between the joint 3 and the transition plate 2, reducing the peak fatigue stress of the joint 3, and reducing the possibility of the joint 3 breaking due to fatigue.

[0047] The anti-rotation structure 212 inside the mounting hole 21 can be of various types. In some embodiments, the inner wall surface of the mounting hole 21 is provided with a first plane 212a. Correspondingly, the connector body 31 of the connector 3 is provided with a second plane 311. The second plane 311 fits against the first plane to prevent the connector 3 from rotating circumferentially relative to the transition plate 2.

[0048] Understandably, in other possible embodiments of this application, the anti-rotation structure may also include multiple anti-rotation grooves, which are spaced apart circumferentially on the inner wall of the mounting hole. Correspondingly, the connector body of the connector is provided with multiple anti-rotation protrusions, which are arranged one-to-one with the anti-rotation grooves, thereby preventing the connector from rotating circumferentially relative to the transition plate. Alternatively, the outer contour surfaces of the mounting hole and the connector body of the connector may be made into non-circular shapes, which can also prevent the connector from rotating circumferentially relative to the transition plate and improve the stability of the connection between the connector and the transition plate. This application does not impose any limitations on this.

[0049] Please refer to Figure 2 In some embodiments, the slip ring body 1 has a receiving groove 13 on the side facing the transition plate 2. The receiving groove 13 communicates with the flow path 11, and the connector 3, which is connected to the flow path 11, is at least partially located within the receiving groove 13. The connector 3 extends into the slip ring body 1 through the receiving groove 13 and communicates with the flow channel within the slip ring body 1. The arrangement of the receiving groove 13, on the one hand, can increase the contact area between the connector 3 and the slip ring body 1, reduce the local stress peak at the connection between the connector 3 and the slip ring body 1, reduce the possibility of fatigue fracture of the connector 3 due to hydraulic oil pulsation impact, and improve the reliability of the connection between the hydraulic slip ring 1000 and the hydraulic pump station. On the other hand, the receiving groove 13 can form a radial constraint on the hydraulic oil flowing along the connector 3 towards the flow channel, thereby reducing the risk of hydraulic oil leakage at the connection between the connector 3 and the flow channel.

[0050] In some embodiments, the wall of the receiving groove 13 is provided with a sealing groove 131, and the hydraulic slip ring 1000 also includes a sealing element 6. The sealing element 6 can be an O-ring, a rectangular ring, a star ring, or a combination of retaining rings, or other high-pressure resistant sealing elements commonly used in the art. This application does not limit this. The outer ring of the sealing element 6 is disposed within the sealing groove 131, and the inner ring of the sealing ring is sleeved outside the connector 3. The sealing element 6 is used to form a radial and axial double sealing barrier between the outer wall of the connector 3 and the wall of the receiving groove 13, reducing the gap between the connector 3 and the groove wall of the receiving groove 13, and reducing hydraulic oil leakage.

[0051] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A hydraulic slip ring, characterized in that, include: A slip ring body having a flow path; A transition plate is disposed on the slip ring body; A connector is provided on the transition plate and is connected to the flow path.

2. The hydraulic slip ring according to claim 1, characterized in that, The slip ring body is provided with a limiting part, which is used to restrict the transition plate from moving radially along the slip ring body.

3. The hydraulic slip ring according to claim 2, characterized in that, The slip ring body includes a body portion, and the limiting portion includes an annular protrusion, which is disposed on the body portion. The transition plate is connected to the main body, and the annular protrusion surrounds the outside of the transition plate.

4. The hydraulic slip ring according to claim 1, characterized in that, The transition plate is detachably connected to the slip ring body.

5. The hydraulic slip ring according to claim 1, characterized in that, The transition plate is provided with mounting holes, and the mounting holes are provided with mating parts; The connector is disposed in the mounting hole, and the connector is provided with a fixing part, which is used to cooperate with the mating part to fix the connector in the mounting hole.

6. The hydraulic slip ring according to claim 5, characterized in that, The mating part includes an annular groove, which is located on the side of the mounting hole near the slip ring body; the fixing part includes a protrusion, which is located in the annular groove and contacts the end face of the slip ring body.

7. The hydraulic slip ring according to claim 1, characterized in that, The transition plate is provided with mounting holes, and the connector is disposed in the mounting holes; The inner wall of the mounting hole is provided with an anti-rotation structure, which is used to cooperate with the outer peripheral surface of the connector to restrict the circumferential rotation of the connector.

8. The hydraulic slip ring according to claim 1, characterized in that, The slip ring body has a receiving groove on the side facing the transition plate, the receiving groove is connected to the flow path, and the connector is at least partially located in the receiving groove.

9. The hydraulic slip ring according to claim 8, characterized in that, The wall of the receiving groove is provided with a sealing groove, and the hydraulic slip ring also includes a sealing element; The outer ring of the seal is disposed within the sealing groove, and the inner ring of the seal is sleeved outside the joint.

10. A wind turbine generator set, characterized in that, Includes the hydraulic slip ring as described in any one of claims 1-9.

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