Slip ring system and wind driven generator

Abstract

The invention provides a slip ring system and a wind driven generator, and the slip ring system comprises a slip ring chamber which is arranged at the end part, far away from a fan blade, of a rotating shaft of the wind driven generator; the cooling system is located on the side, away from the fan blades, of the sliding ring chamber in the axial direction of the rotating shaft. The cooling system is provided with a circulation cavity for airflow circulation, and the inner space of the circulation cavity is communicated with the inner space of the slip ring chamber to form a circulation closed air path not communicated with the outside. And the cooling system can cool the airflow before entering the first inlet of the slip ring chamber, and enables the airflow to circulate in the circulating closed air path. Structures such as a slip ring in the slip ring chamber are positioned in a circulating closed air path which is not communicated with the outside and are isolated from the outside air, so that adverse effects caused by moist air containing salt mist are eliminated; the cooling system does not shield the left and right side surfaces, parallel to the rotating shaft, of the slip ring chamber any more, a wiring space is reserved for leading out wires connected with carbon brush cables from the left and right sides of the slip ring chamber, and the device is suitable for large-megawatt, large-current and multi-carbon-brush schemes.

Description

Technical Field

[0001] The present application relates to the technical field of motor slip ring systems, and particularly to a slip ring system and a wind turbine including the above slip ring system. Background Art

[0002] A doubly-fed wind turbine adopts a wound-rotor structure. During operation, friction between the slip ring and the carbon brush in the slip ring chamber will generate frictional losses, and the contact voltage drop between the carbon brush and the slip ring will generate electrical losses. The heat generated by the losses will cause the temperature of the slip ring and the carbon brush to rise. The excessive temperature will cause premature aging and damage of the surrounding components. When the temperature trip limit is reached, it will cause shutdown. Therefore, it is necessary to find a way to cool the slip ring and the carbon brush and take away the generated heat in time.

[0003] The prior art generally uses air cooling. An air inlet and an air outlet communicating with the outside are provided in the slip ring chamber. The cold air from the outside enters the slip ring chamber through the air inlet, flows through the slip ring and the carbon brush, and then is discharged through the air outlet. However, in a marine or similar environment, the service life of the slip ring and the like is easily affected by the humid salt spray environment and is significantly reduced. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a slip ring system and a wind turbine including the above slip ring system, which solve the problem that the service life of the slip ring and the like is easily affected by the humid salt spray environment.

[0005] In order to achieve the above purpose, the present application provides the following technical solutions:

[0006] A slip ring system includes:

[0007] A slip ring chamber is provided at the end of the rotating shaft of the wind turbine away from the wind blade, and includes a first inlet through which air flow can enter and a first outlet through which air flow can exit;

[0008] A cooling system is located on the side of the slip ring chamber away from the wind blade along the axial direction of the rotating shaft; the cooling system forms a flow cavity for air flow to circulate, and the flow cavity includes a second inlet through which air flow can enter and a second outlet through which air flow can exit; the second outlet is communicated with the first inlet, and the first outlet is communicated with the second inlet, so that the internal space of the flow cavity is communicated with the internal space of the slip ring chamber to form a circulating closed air path not communicated with the outside; the cooling system can cool the air flow before it enters the first inlet and make the air flow circulate in the circulating closed air path.

[0009] Optionally, in the above slip ring system, there is a spacing distance between the cooling system and the slip ring chamber along the axial direction of the rotating shaft;

[0010] The first inlet and the first outlet are respectively formed on two opposite sides of the slip ring chamber in the height direction, and the second outlet and the second inlet are respectively formed on two opposite sides of the circulation chamber in the height direction;

[0011] The second outlet is connected to the first inlet through a first pipe, and the first outlet and the second inlet are connected through a second pipe; the cooling system, the first pipe, the slip ring chamber, and the second pipe are connected in a cycle to form a "mouth"-shaped closed circulation air path.

[0012] Optionally, in the above slip ring system, along the axial direction of the rotating shaft, the slip ring chamber has a first width, and the spacing distance is greater than or equal to the first width.

[0013] Optionally, in the above slip ring system, the cooling system includes a fan unit, a heat dissipation unit, and a filtering unit;

[0014] The fan unit includes a fan housing, the heat dissipation unit includes a heat dissipation housing, and the filtering unit includes a filtering housing; the fan housing, the heat dissipation housing, and the filtering housing are connected in sequence to form the circulation chamber; the outlet of the filtering housing is the second outlet, and the inlet of the fan housing is the second inlet.

[0015] Optionally, in the above slip ring system, the filtering unit is a single-stage filtering structure.

[0016] Optionally, in the above slip ring system, the filtering unit includes a filtering component arranged in the filtering housing, and the filtering component includes filter cotton and a protective net, and the protective net covers the outer surface of the filter cotton.

[0017] Optionally, in the above slip ring system, sliding grooves are arranged on two opposite inner surfaces of the filtering housing, and two opposite sides of the filtering component can be detachably slidably connected in the sliding grooves.

[0018] Optionally, in the above slip ring system, the outlet of the fan housing is connected to the inlet of the heat dissipation housing through a third pipe.

[0019] Optionally, in the above slip ring system, the heat dissipation unit includes a fin heat sink arranged in the heat dissipation housing, and the fin heat sink is a plate fin heat sink or a copper tube fin heat sink.

[0020] A wind turbine includes the slip ring system as described above.

[0021] In the slip ring system and the wind turbine of the present application, the cooling system forms a circulation chamber. The internal space of the circulation chamber is communicated with the internal space of the slip ring chamber, and a circulating closed air path that is not communicated with the outside world is formed. The cooling system can cool the air flow before the first inlet of the slip ring chamber and make the air flow circulate in the circulating closed air path. The circulating path is as follows: The air flow circulates in the circulation chamber, and the cooling system cools the air flow to obtain a cooled air flow → The cooled air flow passes through the second outlet of the circulation chamber to the first inlet of the slip ring chamber to enter the slip ring chamber → The cooled air flow cools the components such as the slip ring, carbon brush, and brush holder in the slip ring chamber. After heat exchange, the cooled air flow becomes a high-temperature air flow → The high-temperature air flow passes through the first outlet of the slip ring chamber to the second inlet of the circulation chamber to return to the circulation chamber → The high-temperature air flow circulates in the circulation chamber, and the cooling system cools the high-temperature air flow to obtain a cooled air flow, and so on in a cycle, continuously providing a cooled air flow for the slip ring chamber; As above, the structures such as the slip ring, carbon brush, and brush holder in the slip ring chamber are in a circulating closed air path that is not communicated with the outside world. During the process of the air flow circulating in the circulating closed air path, it is isolated from the outside air, eliminating the influence of humid and salt-laden air on the structures such as the slip ring, carbon brush, and brush holder in the slip ring chamber and ensuring the service life; Moreover, when the air flow circulates in the circulating closed air path, zero emission of carbon powder outside the slip ring system is achieved, eliminating the influence of carbon powder on other electrical components in the nacelle of the wind turbine and environmental pollution.

[0022] Further, the slip ring chamber of the present application is located at the end of the rotating shaft of the wind turbine away from the wind blade, and along the axial direction of the rotating shaft, the cooling system is located on the side of the slip ring chamber away from the wind blade; As above, the cooling system no longer blocks the left and right side surfaces of the slip ring chamber parallel to the rotating shaft, reserving a wiring space for leading out and connecting the carbon brush cables on both the left and right sides of the slip ring chamber, which is suitable for the solutions of large megawatt, large current, and multiple carbon brushes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0024] Figure 1 It is a schematic structural diagram of the slip ring system according to the embodiment of the present application;

[0025] Figure 2 It is a schematic structural diagram of the cooling system according to the embodiment of the present application.

[0026] Above Figure 1-2 Among them:

[0027] 1. Slip ring chamber; 2. Cooling system; 3. First pipe; 4. Second pipe; 5. Third pipe;

[0028] 21. Fan unit; 22. Heat dissipation unit; 23. Filter unit;

[0029] 231. Filter cotton; 232. Protection net. Detailed implementation manners

[0030] This application provides a slip ring system and a wind turbine.

[0031] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0032] As Figure 1 - Figure 2 shown, the embodiment of this application provides a slip ring system, and this slip ring system is arranged in the nacelle of a wind turbine generator set. The wind turbine generator set includes a wind turbine, a gearbox, and a wind turbine; the wind turbine includes wind blades and a hub, and the rotation of the wind blades drives the rotation of the hub; the hub is drivingly connected to the rotating shaft of the wind turbine through the gearbox, and the gearbox converts the low-speed rotation of the hub driven by the wind turbine into the high-speed rotation required by the rotating shaft of the wind turbine. Optionally, the above-mentioned wind turbine is an offshore wind turbine. The axial direction of the rotating shaft of the wind turbine is defined as the front-back direction, and the direction perpendicular to the front-back direction and the height direction is defined as the left-right direction.

[0033] The slip ring system includes a slip ring chamber 1 and a cooling system 2. The slip ring chamber 1 is used to provide safety protection for structures such as slip rings, carbon brushes, and brush holders installed in the slip ring chamber 1. Through the cooperation of the slip ring and the carbon brush, when the rotating shaft of the wind turbine drives the rotor to rotate, an exciting current is provided for the rotor coil. The slip ring chamber 1 is arranged at the end of the rotating shaft far from the wind blades. The slip ring chamber includes a first inlet through which air can flow in and a first outlet through which air can flow out. Along the axial direction of the rotating shaft, the cooling system 2 is located on the side of the slip ring chamber 1 far from the wind blades. The cooling system 2 forms a flow cavity for air flow. The flow cavity includes a second inlet through which air can flow in and a second outlet through which air can flow out. The second outlet is communicated with the first inlet, and the first outlet is communicated with the second inlet, so that the internal space of the flow cavity is communicated with the internal space of the slip ring chamber, forming a closed circulating air path that is not communicated with the outside. The cooling system 2 can cool the air flow before it enters the first inlet and make the air flow circulate in the closed circulating air path.

[0034] It should be noted that the internal space of the slip ring chamber 1, i.e., inside the slip ring chamber 1, and the internal space of the circulation chamber, i.e., inside the circulation chamber.

[0035] In summary, the path of the air flow circulating in the circulating closed air duct is as follows: The air flow circulates in the circulation chamber, and the cooling system 2 cools the air flow to obtain a cooled air flow → The cooled air flow passes through the second outlet of the circulation chamber to the first inlet of the slip ring chamber 1 to enter the slip ring chamber 1 → The cooled air flow cools the components such as the slip ring, brush holder, and carbon brush inside the slip ring chamber 1, and the cooled air flow becomes a high-temperature air flow after heat exchange → The high-temperature air flow passes through the first outlet of the slip ring chamber 1 to the second inlet of the circulation chamber to flow back into the circulation chamber → The high-temperature air flow circulates in the circulation chamber, and the cooling system 2 cools the high-temperature air flow to obtain a cooled air flow, and so on in a cycle to continuously provide a cooled air flow for the inside of the slip ring chamber 1; as above, the structures such as the slip ring, carbon brush, and brush holder inside the slip ring chamber 1 are in a circulating closed air duct that is not connected to the outside. During the process of the air flow circulating in the circulating closed air duct, it is isolated from the outside air, eliminating the influence of humid and salt spray-containing air on the structures such as the slip ring, carbon brush, and brush holder inside the slip ring chamber 1 and ensuring the service life; moreover, when the air flow circulates in the circulating closed air duct, zero emission of carbon powder outside the slip ring system is achieved, eliminating the influence of carbon powder on other electrical components in the nacelle of the wind turbine and environmental pollution.

[0036] Furthermore, the slip ring chamber 1 of the present application is located at the end of the rotating shaft away from the wind blade, and along the axial direction of the rotating shaft, the cooling system 2 is located on the side of the slip ring chamber 1 away from the wind blade; as above, the cooling system 2 is located at the rear of the slip ring chamber 1, and it no longer blocks the left and right side surfaces of the slip ring chamber 1 parallel to the rotating shaft, reserving a wiring space for leading out the connecting carbon brush cables on both the left and right sides of the slip ring chamber 1, which is suitable for the scheme of large megawatt, large current, and multiple carbon brushes.

[0037] In some embodiments of the present application, there is a spacing distance between the cooling system 2 and the slip ring chamber 1 along the axial direction of the rotating shaft. The slip ring chamber 1 is respectively provided with a first inlet and a first outlet on the two opposite sides in the height direction, and the circulation chamber is respectively formed with a second outlet and a second inlet on the two opposite sides in the height direction. The second outlet and the first inlet are connected through the first pipe 3, and the first outlet and the second inlet are connected through the second pipe 4. The cooling system 2, the first pipe 3, the slip ring chamber 1, and the second pipe 4 are connected in a cycle to form a "mouth"-shaped circulating closed air duct.

[0038] It should be noted that the ""mouth"-shaped circulating closed air duct" means that the path of the air flow circulating in the circulating closed air duct is in the shape of a "mouth", which can be a standard "mouth" shape or a quasi-"mouth" shape with a certain deformation, as long as it can ensure the formation of an annular circulating path and ensure that there is a spacing distance between the cooling system 2 and the slip ring chamber 1 that allows maintenance personnel to pass through.

[0039] Instead of being arranged closely against the rear side of the slip ring chamber 1, the cooling system 2 of the present application has a certain spacing distance from the rear side of the slip ring chamber 1, leaving enough maintenance space. Maintenance personnel can stay within the maintenance space, facing the rear side of the slip ring chamber 1, or can move flexibly through the above-mentioned maintenance space to face the left side or the right side of the slip ring chamber 1, so as to facilitate the disassembly, replacement and maintenance of the slip ring chamber 1 and the components inside the slip ring chamber 1.

[0040] Optionally, the first inlet is located below the first outlet, the second outlet is located below the second inlet, and it is ensured that the height of the second outlet is basically the same as that of the first inlet, or the height difference between the two is offset by the bending of the first pipe 3; and it is ensured that the height of the first outlet is basically the same as that of the second inlet, or the height difference between the two is eliminated by the second pipe 4. The first pipe 3 and the second pipe 4 can extend the flow path of the air flow, increase the heat dissipation time of the air flow and the air outside the pipe, and are beneficial to the heat dissipation and cooling of the air flow.

[0041] In some embodiments of the present application, along the axial direction of the rotating shaft, the slip ring chamber 1 has a first width, and the spacing distance between the cooling system 2 and the slip ring chamber 1 is greater than or equal to the first width. Preferably, the above-mentioned spacing distance is greater than the first width.

[0042] Since the above-mentioned spacing distance is greater than or equal to the first width of the slip ring chamber 1, a sufficiently large maintenance space is formed at the spacing distance, which can accommodate the entire slip ring chamber 1 and the components inside the slip ring chamber 1, and is more convenient for the disassembly, replacement and maintenance of the slip ring chamber 1 and the components inside the slip ring chamber 1.

[0043] In some embodiments of the present application, the cooling system 2 includes a fan unit 21, a heat dissipation unit 22 and a filtering unit 23. The fan unit 21 includes a fan housing, the heat dissipation unit 22 includes a heat dissipation housing, and the filtering unit 23 includes a filtering housing. The outlet of the fan housing is communicated with the inlet of the heat dissipation housing, and the outlet of the heat dissipation housing is communicated with the inlet of the filtering housing; as above, the fan housing, the heat dissipation housing and the filtering housing are sequentially communicated to form a flow chamber. The outlet of the filtering housing is the second outlet of the flow chamber, and the inlet of the fan housing is the second inlet of the flow chamber.

[0044] The fan unit 21, the heat dissipation unit 22, and the filter unit 23 all have a housing structure, making it possible to form a circulation chamber for air flow. The fan unit 21 provides the power for the cyclic circulation of the air flow, enabling the air flow to circulate stably and reliably in the cyclic closed air path, and continuously providing cooling air flow inside the slip ring chamber 1; the heat dissipation unit 22 can dissipate the heat of the air flow to the outside of the circulation chamber, so that the air flow reaches the effect of cooling; the filter unit 23 can filter impurities such as carbon powder in the air flow, preventing the air flow containing carbon powder from returning to the slip ring chamber 1 again, which may cause arcing and sparking between the slip ring and the carbon brush; and it can prevent carbon powder from adhering to the surface of the circulation chamber, reducing the cooling effect of the cooling system 2 on the air flow.

[0045] In some embodiments of the present application, the filter unit 23 is a single-stage filtering structure.

[0046] As described above, through single-stage filtering by the filter unit 23, it has the characteristic of a large dust capacity, avoiding the problems of a small dust capacity and frequent maintenance in the front-end filtering structure of the multi-stage filtering structure.

[0047] Please refer to the attached Figure 2 , in some embodiments of the present application, the filter unit 23 includes a filter assembly disposed inside the filter housing. The filter assembly includes filter cotton 231 and a protective net 232, and the protective net 232 covers the outer surface of the filter cotton 231.

[0048] The protective net 232 is a densely arranged grid-like structure; by providing the filter cotton 231, the risk of the filter cotton 231 being blown out by the air flow can be avoided, improving the reliability of the filter assembly.

[0049] In some embodiments of the present application, sliding grooves are provided on both inner surfaces of the filter housing that are opposite to each other, and both opposite sides of the filter assembly can be detachably slidably connected to the sliding grooves, so as to achieve a push-pull detachable connection of the filter assembly inside the filter housing.

[0050] Optionally, both opposite sides of the filter assembly are equivalent to forming slide rail bars that can be slidably connected in a push-pull manner in the sliding grooves; the slide rail bars of the filter assembly can be pushed into and snap-fixed in the sliding grooves, or pulled out and disengaged from being fixed in the sliding grooves. When the filter assembly is pushed into the interior of the filter housing and in place, the filter assembly just snaps and fixes in the sliding grooves, and seals the opening on the filter housing through which the filter assembly can be pushed in and out, making the filter housing in a closed state.

[0051] As described above, it is convenient for disassembly, replacement, and maintenance of the filter assembly, ensuring the cleanliness of the air flow circulating in the cyclic closed air path.

[0052] In certain embodiments of the present application, a third pipe 5 is connected between the fan housing and the heat dissipation housing; that is, the outlet of the fan housing is communicated with the inlet of the heat dissipation housing through the third pipe 5. As described above, the third pipe 5 extends the flow path of the air flow, increases the heat dissipation time of the air flow and the air outside the pipe, and is beneficial to the heat dissipation and cooling of the air flow.

[0053] In certain embodiments of the present application, the fan unit 21 includes a driving motor and a fan. The driving motor is arranged outside the fan housing, and the fan is arranged inside the fan housing. Optionally, the fan is a top-mounted motor centrifugal fan; or, the fan is a volute single-inlet centrifugal fan.

[0054] In certain embodiments of the present application, the heat dissipation unit 22 includes a fin radiator arranged inside the heat dissipation housing. The fin radiator is a plate fin radiator or a copper tube fin radiator.

[0055] Through the fin radiator, the heat in the air flow can be quickly diffused to the outside of the flow cavity, realizing the rapid cooling of the air flow. The plate fin radiator or the copper tube fin radiator can be selected according to actual needs, with strong flexibility and practicability.

[0056] In summary, the present application also discloses a wind turbine, which includes the slip ring system as described above.

[0057] Since the wind turbine of the present application includes the slip ring system as described above, the beneficial effects brought by the slip ring system to the wind turbine can be seen above and will not be elaborated here.

[0058] In summary, the present application also provides a wind turbine generator set, which includes a nacelle and the wind turbine as described above arranged inside the nacelle.

[0059] Since the wind turbine generator set of the present application includes the wind turbine as described above, the beneficial effects brought by the wind turbine to the wind turbine generator set can be seen above and will not be elaborated here.

[0060] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purposes of illustration and easy understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details to implement.

[0061] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the phrase "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0062] It should also be noted that in the devices, equipment, and methods of this application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of this application.

[0063] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be very apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0064] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth", and "sixth" used in the description of the embodiments of this application are only used to more clearly elaborate the technical solutions and cannot be used to limit the protection scope of this application.

[0065] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A slip ring system, characterized in that: Comprising: A slip ring chamber (1) is arranged at the end of the rotating shaft of the wind turbine away from the wind blades, and includes a first inlet through which air flow can enter and a first outlet through which air flow can exit; A cooling system (2) is located on the side of the slip ring chamber (1) away from the wind blades along the axial direction of the rotating shaft; the cooling system (2) forms a circulation chamber for air flow, and the circulation chamber includes a second inlet through which air flow can enter and a second outlet through which air flow can exit; the second outlet is communicated with the first inlet, and the first outlet is communicated with the second inlet, so that the internal space of the circulation chamber is communicated with the internal space of the slip ring chamber to form a closed circulating air path not communicated with the outside; the cooling system (2) can cool the air flow before entering the first inlet and make the air flow circulate in the closed circulating air path.

2. The slip ring system according to claim 1, characterized in that: Along the axial direction of the rotating shaft, there is a spacing distance between the cooling system (2) and the slip ring chamber (1); The first inlet and the first outlet are respectively provided on the two opposite sides of the slip ring chamber (1) in the height direction, and the second outlet and the second inlet are respectively formed on the two opposite sides of the circulation chamber in the height direction; The second outlet and the first inlet are communicated through a first pipe (3), and the first outlet and the second inlet are communicated through a second pipe (4); the cooling system (2), the first pipe (3), the slip ring chamber (1), and the second pipe (4) are circularly communicated to form the closed circulating air path in a "mouth" shape.

3. The slip ring system according to claim 2, characterized in that: Along the axial direction of the rotating shaft, the slip ring chamber (1) has a first width, and the spacing distance is greater than or equal to the first width.

4. The slip ring system according to claim 1, characterized in that: The cooling system (2) includes a fan unit (21), a heat dissipation unit (22), and a filtering unit (23); The fan unit (21) includes a fan housing, the heat dissipation unit (22) includes a heat dissipation housing, and the filtering unit (23) includes a filtering housing; the fan housing, the heat dissipation housing, and the filtering housing are sequentially communicated to form the circulation chamber; the outlet of the filtering housing is the second outlet, and the inlet of the fan housing is the second inlet.

5. The slip ring system according to claim 4, characterized in that: The filtering unit (23) is a single-stage filtering structure.

6. The slip ring system according to claim 5, characterized in that: The filtering unit (23) includes a filtering component arranged in the filtering housing, and the filtering component includes filter cotton (231) and a protective net (232), and the protective net (232) covers the outer surface of the filter cotton (231).

7. The slip ring system according to claim 6, characterized in that: Sliding grooves are provided on the two opposite inner surfaces of the filtering housing, and the two opposite sides of the filtering component can be slidably connected in the sliding grooves to realize the push-pull detachable connection of the filtering component in the filtering housing.

8. The slip ring system according to claim 4, characterized in that: The outlet of the fan housing is communicated with the inlet of the heat dissipation housing through a third pipe (5).

9. The slip ring system according to claim 4, characterized in that: The heat dissipation unit (22) includes a fin radiator arranged in the heat dissipation housing, and the fin radiator is a plate fin radiator or a copper tube fin radiator.

10. A wind turbine generator, characterized in that: Comprising the slip ring system according to any one of claims 1-9.

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