Slip ring system and wind driven generator

Abstract

The utility model 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 system, in particular to a slip ring system and a wind driven generator comprising the same. BACKGROUND

[0002] The double-fed wind driven generator adopts a wound rotor structure. When in operation, the friction between the slip ring in the slip ring chamber and the carbon brush generates friction loss, and the contact pressure drop between the carbon brush and the slip ring generates electrical loss. The heat generated by the loss causes the temperature of the slip ring and the carbon brush to rise. The excessively high temperature causes the surrounding components to age and damage prematurely. When the temperature trip limit is reached, the wind driven generator will be shut down. Therefore, measures must be taken to cool the slip ring and the carbon brush and remove the generated heat in time.

[0003] The prior art generally adopts air cooling. An air inlet and an air outlet are formed in the slip ring chamber to communicate with the outside. 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 is then discharged through the air outlet. However, in the sea or similar environment, the service life of the slip ring and the like is easily affected by the humid salt spray environment and significantly reduced. CONTENT OF THE INVENTION

[0004] Therefore, the present application aims to provide a slip ring system and a wind driven generator comprising the same, 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] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A slip ring system comprises:

[0007] A slip ring chamber is arranged at the end of the rotating shaft of the wind driven generator away from the blades and comprises a first inlet capable of allowing airflow to flow in and a first outlet capable of allowing airflow to flow out;

[0008] A cooling system is located at the side of the slip ring chamber away from the blades along the axial direction of the rotating shaft. The cooling system forms a circulation cavity for airflow to flow through. The circulation cavity comprises a second inlet capable of allowing airflow to flow in and a second outlet capable of allowing airflow to flow out. The second outlet communicates with the first inlet, and the first outlet communicates with the second inlet, so that the internal space of the circulation cavity and the internal space of the slip ring chamber communicate to form a circulating closed air path that does not communicate with the outside. The cooling system can cool the airflow before it enters the first inlet and make the airflow circulate in the circulating closed air path.

[0009] Optionally, in the above-mentioned slip ring system, the cooling system and the slip ring chamber have a spacing distance along the axial direction of the rotating shaft.

[0010] The first inlet and the first outlet are respectively arranged on opposite sides of the slip ring chamber along a height direction, and the second outlet and the second inlet are respectively formed on opposite sides of the flow-through chamber along the height direction.

[0011] The second outlet is connected with 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 in circulation connection, thereby forming the "mouth" type circulation closed air path.

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

[0013] Optionally, in the above-mentioned slip ring system, the cooling system comprises a fan unit, a heat dissipation unit, and a filtering unit.

[0014] The fan unit comprises a fan shell, the heat dissipation unit comprises a heat dissipation shell, and the filtering unit comprises a filtering shell; the fan shell, the heat dissipation shell, and the filtering shell are in sequence connection, thereby forming the flow-through chamber; an outlet of the filtering shell is the second outlet, and an inlet of the fan shell is the second inlet.

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

[0016] Optionally, in the above-mentioned slip ring system, the filtering unit comprises a filtering assembly arranged in the filtering shell, the filtering assembly comprises filter cotton and a protective net, and the protective net covers an outer surface of the filter cotton.

[0017] Optionally, in the above-mentioned slip ring system, opposite inner surfaces of the filtering shell are respectively provided with sliding grooves, and positionally opposite sides of the filtering assembly are detachably and slidably connected in the sliding grooves.

[0018] Optionally, in the above-mentioned slip ring system, an outlet of the fan shell is connected with an inlet of the heat dissipation shell through a third pipe.

[0019] Optionally, in the above-mentioned slip ring system, the heat dissipation unit comprises a fin heat radiator arranged in the heat dissipation shell, and the fin heat radiator is a plate-fin heat radiator or a copper-pipe fin heat radiator.

[0020] A wind power generator comprises the above-mentioned slip ring system.

[0021] The cooling system of the slip ring system and the wind driven generator forms a flow chamber, the internal space of the flow chamber is communicated with the internal space of the slip ring chamber, and a circulating closed air path which is not communicated with the outside is formed. The cooling system can cool the airflow before the first inlet of the slip ring chamber, and make the airflow circulate in the circulating closed air path. The circulation path is as follows: the airflow circulates in the flow chamber, the cooling system cools the airflow to obtain cooled airflow, the cooled airflow enters the slip ring chamber through the second outlet of the flow chamber and the first inlet of the slip ring chamber, the cooled airflow cools the slip ring, the carbon brush, the brush holder and other components in the slip ring chamber, the cooled airflow becomes high-temperature airflow after heat exchange, the high-temperature airflow returns to the flow chamber through the first outlet of the slip ring chamber and the second inlet of the flow chamber, the high-temperature airflow circulates in the flow chamber, the cooling system cools the high-temperature airflow to obtain cooled airflow, and the circulation is repeated. The slip ring, the carbon brush, the brush holder and other structures in the slip ring chamber are in the circulating closed air path which is not communicated with the outside, the airflow is isolated from the outside air during the circulation in the circulating closed air path, the influence of the humid and salt-containing air on the slip ring, the carbon brush, the brush holder and other structures in the slip ring chamber is eliminated, and the service life is guaranteed. Moreover, the carbon powder is zero-emission outside the slip ring system during the circulation of the airflow in the circulating closed air path, and the influence of the carbon powder on other electrical elements in the nacelle of the wind driven generator and environmental pollution are eliminated.

[0022] Further, the slip ring chamber of the present application is located at the end of the rotating shaft of the wind driven generator which is away from the wind blade, and the cooling system is located at the side of the slip ring chamber which is away from the wind blade along the axial direction of the rotating shaft. As described above, the cooling system no longer shields the left and right sides of the slip ring chamber which are parallel to the rotating shaft, and the wiring space for the carbon brush cable is reserved for the left and right sides of the slip ring chamber, which is suitable for large megawatt, large current and multiple carbon brush solutions. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0024] Fig. 1 The structure diagram of the slip ring system of the present application;

[0025] Fig. 2 The structure diagram of the cooling system of the present application.

[0026] The above Figs. 1-2 In the above

[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. Protective netting. Detailed Implementation

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

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] like Figs. 1-2 As shown, this application embodiment provides a slip ring system installed inside the nacelle of a wind turbine generator set. The wind turbine generator set includes a rotor, a gearbox, and a wind turbine; the rotor includes blades and a hub, with the blades rotating to drive the hub; the hub is connected to the rotating shaft of the wind turbine generator via the gearbox, which converts the low-speed rotation of the hub driven by the rotor into the high-speed rotation required by the wind turbine generator's rotating shaft. Optionally, the aforementioned wind turbine generator is an offshore wind turbine generator. The axial direction of the wind turbine generator's rotating shaft is defined as the forward / backward direction, and the directions perpendicular to the forward / backward direction and the height direction are defined as the left / right directions, respectively.

[0033] The slip ring system includes a slip ring chamber 1 and a cooling system 2. The slip ring chamber 1 provides safety protection for the slip rings, carbon brushes, brush holders, and other structures installed within it. Through the cooperation of the slip rings and carbon brushes, it provides excitation current to the rotor coils when the rotating shaft of the wind turbine drives the rotor to rotate. The slip ring chamber 1 is located at the end of the rotating shaft away from the wind blades. The slip ring chamber includes a first inlet for airflow and a first outlet for airflow. 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 blades. The cooling system 2 forms a flow chamber for airflow. The flow chamber includes a second inlet for airflow and a second outlet for airflow. The second outlet communicates with the first inlet, and the first outlet communicates with the second inlet, so that the internal space of the flow chamber is connected to the internal space of the slip ring chamber, forming a closed-loop airflow path that is not connected to the outside. The cooling system 2 cools the airflow before it enters the first inlet and circulates the airflow within the closed-loop airflow path.

[0034] It should be noted that the internal space of the slip ring chamber 1, i.e. inside the slip ring chamber 1, is the internal space of the flow-through chamber, i.e. inside the flow-through chamber.

[0035] In summary, the path of the airflow circulating and flowing through the circulating closed air path is as follows: the airflow flows through the flow-through chamber, the cooling system 2 cools the airflow to obtain cooled airflow → the cooled airflow passes through the second outlet of the flow-through chamber to the first inlet of the slip ring chamber 1 to enter the slip ring chamber 1 → the cooled airflow cools the components such as the slip ring, brush holder, carbon brush, etc. in the slip ring chamber 1, and the cooled airflow becomes high-temperature airflow after heat exchange → the high-temperature airflow passes through the first outlet of the slip ring chamber 1 to the second inlet of the flow-through chamber to return to the flow-through chamber → the high-temperature airflow flows through the flow-through chamber, and the cooling system 2 cools the high-temperature airflow to obtain cooled airflow, and the process is repeated to continuously provide cooled airflow to the slip ring chamber 1; as described above, the slip ring, carbon brush, brush holder, etc. in the slip ring chamber 1 are in a circulating closed air path that is not connected to the outside, and the airflow is isolated from the outside air during the circulating and flowing process in the circulating closed air path, eliminating the influence of humid and salt-containing air on the slip ring, carbon brush, brush holder, etc. in the slip ring chamber 1, and ensuring the service life; moreover, when the airflow circulates and flows through 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 elements in the nacelle of the wind turbine and environmental pollution.

[0036] Further, 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 described above, the cooling system 2 is located on the rear side of the slip ring chamber 1, which no longer blocks the left and right sides of the slip ring chamber 1 parallel to the rotating shaft, leaving wiring space for the left and right sides of the slip ring chamber 1 to connect the carbon brush cable, which is suitable for large megawatt large current and multiple carbon brush solutions.

[0037] In some embodiments of the present application, along the axial direction of the rotating shaft, the cooling system 2 and the slip ring chamber 1 have a spacing distance. The first inlet and the first outlet are respectively formed on the opposite sides of the slip ring chamber 1 along the height direction, and the second outlet and the second inlet are respectively formed on the opposite sides of the flow-through chamber along the height direction. The second outlet and the first inlet are connected by the first pipe 3, and the first outlet and the second inlet are connected by 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 circulation to form a "mouth" type circulating closed air path.

[0038] It should be noted that the "mouth" type circulating closed air path refers to the path of the airflow circulating and flowing through the circulating closed air path, which is in the shape of a "mouth", which can be a standard "mouth" shape or a "mouth" shape with certain deformation, as long as it can ensure the formation of a circulating flow path and ensure that the cooling system 2 and the slip ring chamber 1 have a spacing distance for maintenance personnel to pass through.

[0039] The cooling system 2 of the present application is no longer arranged close to the rear side of the slip ring chamber 1, but has a certain interval distance between the cooling system 2 and the rear side of the slip ring chamber 1, leaving enough maintenance space, so that the maintenance personnel can stay in the maintenance space, opposite to the rear side of the slip ring chamber 1, or can move to opposite to the left side or right side of the slip ring chamber 1 by passing through the above-mentioned maintenance space, so as to facilitate the disassembly, replacement and maintenance of the slip ring chamber 1 and the components in 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 the height of the second outlet is substantially level with the first inlet, or the height difference between the two is offset by the bending of the first pipe 3; and the height of the first outlet is substantially level with 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 prolong the circulation path of the airflow, increase the heat dissipation time of the airflow and the air outside the pipe, and be beneficial to the heat dissipation and cooling of the airflow.

[0041] In some embodiments of the present application, along the axial direction of the rotation axis, the slip ring chamber 1 has a first width, and the interval 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 interval distance is greater than the first width.

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

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

[0044] The fan unit 21, the heat dissipation unit 22 and the filtering unit 23 all have a shell structure, which makes it possible to form a flow circulation chamber for the circulation of air flow. The fan unit 21 provides power for the circulation of air flow, so that the air flow can circulate stably and reliably in the circulating closed air path, and continuously provide cooling air flow in the slip ring chamber 1; the heat dissipation unit 22 can dissipate the heat of the air flow to the outside of the flow circulation chamber, so that the air flow can be cooled; the filtering unit 23 can filter the carbon powder and other impurities in the air flow, so as to avoid the arc and spark of the slip ring and carbon brush caused by the air flow containing carbon powder returning to the slip ring chamber 1, and avoid the carbon powder adhering to the surface of the flow circulation chamber, thereby reducing the cooling effect of the cooling system 2 on the air flow.

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

[0046] As described above, the single-stage filtering by the filtering unit 23 has the characteristics of large dust holding capacity, which avoids the problem of frequent maintenance of the front-end filtering structure with small dust holding capacity in the multi-stage filtering structure.

[0047] Please refer to the accompanying drawings Fig. 2 In some embodiments of the present application, the filtering unit 23 includes a filtering assembly arranged in the filtering shell, and the filtering 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 dense grid structure; by arranging the filter cotton 231, the risk of the filter cotton 231 being blown by the air flow can be avoided, and the reliability of the filtering assembly is improved.

[0049] In some embodiments of the present application, the two opposite inner surfaces of the filtering shell are provided with sliding grooves, and the two opposite sides of the filtering assembly are detachably connected to the sliding grooves in a sliding manner, so as to realize the push-pull detachable connection of the filtering assembly in the filtering shell.

[0050] Optionally, the two opposite sides of the filtering assembly correspond to sliding rail strips that can be connected in a push-pull sliding manner in the sliding grooves; the sliding rail strips of the filtering assembly can be pushed into the sliding grooves and fixed, or pulled out of the sliding grooves and separated. When the filtering assembly is pushed into the filtering shell and reaches the position, the filtering assembly is just fixed in the sliding grooves and seals the opening of the filtering shell through which the filtering assembly is pushed and pulled out, so that the filtering shell is in a closed state.

[0051] As described above, the disassembly, replacement and maintenance of the filtering assembly are facilitated, and the cleanliness of the air flow circulating in the circulating closed air path is ensured.

[0052] In some 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 mentioned above, the third pipe 5 prolongs the flow path of the airflow, increases the heat dissipation time of the airflow and the air outside the pipe, and is beneficial to the heat dissipation and cooling of the airflow.

[0053] In some embodiments of the present application, the fan unit 21 comprises 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 motor centrifugal fan; or, the fan is a volute single-inlet centrifugal fan.

[0054] In some embodiments of the present application, the heat dissipation unit 22 comprises a finned radiator arranged in the heat dissipation housing, the finned radiator is a plate-fin radiator or a copper pipe finned radiator.

[0055] The heat in the airflow can be quickly spread to the outside of the flow chamber through the finned radiator, so as to realize the rapid cooling of the airflow. The plate-fin radiator or the copper pipe finned radiator can be selected and used according to actual needs, and the finned radiator is flexible and practical.

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

[0057] Since the wind turbine of the present application comprises the slip ring system as described above, the beneficial effects of the wind turbine brought by the slip ring system are described above, and will not be repeated here.

[0058] In summary, the present application also provides a wind turbine generator unit, which comprises a nacelle and a wind turbine as described above arranged in the nacelle.

[0059] Since the wind turbine generator unit of the present application comprises the wind turbine as described above, the beneficial effects of the wind turbine generator unit brought by the wind turbine are described above, and will not be repeated here.

[0060] The above describes the basic principles of the present application in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects and the like mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the must-have of each embodiment of the present application. In addition, the above-mentioned specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the above-mentioned specific details. The above-mentioned details do not limit the present application to the above-mentioned specific details.

[0061] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have", and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably, unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

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

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

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

[0065] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of 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), disposed at the end of the rotating shaft of the wind turbine away from the wind blades, including a first inlet through which air flow can enter and a first outlet through which air flow can exit; A cooling system (2), axially along the rotating shaft, located on the side of the slip ring chamber (1) away from the wind blades; the cooling system (2) forms a flow chamber for air flow, and the flow 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 connected to the first inlet, and the first outlet is connected to the second inlet, so that the internal space of the flow chamber is connected to the internal space of the slip ring chamber to form a circulating closed air path that is not connected to 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 circulating closed air path.

2. The slip ring system according to claim 1, characterized in that, Axially along 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 opened 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 flow chamber in the height direction; The second outlet and the first inlet are connected by a first pipe (3), and the first outlet and the second inlet are connected by a second pipe (4); the cooling system (2), the first pipe (3), the slip ring chamber (1), and the second pipe (4) are circularly connected to form the circulating closed air path in the shape of a "mouth".

3. The slip ring system according to claim 2, characterized in that, Axially along 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 filter unit (23); The fan unit (21) includes a fan housing, the heat dissipation unit (22) includes a heat dissipation housing, and the filter unit (23) includes a filter housing; the fan housing, the heat dissipation housing, and the filter housing are sequentially connected to form the flow chamber; the outlet of the filter 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 filter unit (23) is a single-stage filtering structure.

6. The slip ring system according to claim 5, characterized in that, The filter unit (23) includes a filter component disposed in the filter housing, and the filter 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 inner surfaces of the filter housing opposite to each other, and the two opposite sides of the filter component can be slidably connected to the sliding grooves to realize the push-pull detachable connection of the filter component in the filter housing.

8. The slip ring system according to claim 4, characterized in that, The outlet of the fan housing is connected to 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 disposed 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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