Slip ring and wind turbine generator set

Abstract

The application relates to a slip ring and a wind turbine generator set, the slip ring comprising: a rotor assembly comprising a rotating shaft and rotor units arranged in pairs and spaced apart in the axial direction of the rotating shaft, each rotor unit comprising two or more slip rings spaced apart in the axial direction, wherein the slip rings of one rotor unit are connected in series with the corresponding slip rings of another rotor unit; and a stator assembly comprising stator units corresponding to the rotor units one by one, each stator unit comprising a stator support and a plurality of ring assemblies arranged on the stator support and spaced apart in the axial direction, each ring assembly comprising a ring plate, a brush assembly arranged on the ring plate and a busbar electrically connected with the brush assembly, and each brush assembly being in contact with and electrically connected with the corresponding slip ring. The application can meet the requirement of electric energy transmission, avoid the occurrence of cable twisting when the wind turbine generator set is in yawing motion, ensure the safety of the power transmission cable, simplify the rotor assembly and facilitate the forming of the slip ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power technology, in particular to a current collecting ring and a wind turbine generator. BACKGROUND

[0002] In the process of using cables to transmit electric energy, the relative position of the cable often needs to be changed in coordination with the connected components, and the impact of the operation of the coordination on the transmission function and service life of the cable is minimized.

[0003] For example, the power transmission cable applied to the wind turbine generator, one end of the power transmission cable is electrically connected with the functional devices such as the generator located in the nacelle, for transmitting the electric energy generated by the generator to other components. During the operation of the wind turbine generator, when the change of wind direction reaches a certain degree, the wind turbine generator performs corresponding yaw action, so that the nacelle rotates together with the end of the power transmission cable connected with the functional devices such as the generator by a certain angle. The phenomenon of cable twisting caused by the power transmission cable will continue to accumulate. In order to ensure the safety of the power transmission cable, a current collecting ring is often used to connect the power transmission cable located in the nacelle and the power transmission cable located in the tower, which can alleviate the problem of cable twisting. However, the existing current collecting ring adopts a single stator cooperating with a single rotor, which causes the rotor to be connected with one of the power transmission cable in the nacelle or the power transmission cable in the tower, and further requires multiple electric connection rods to be extended, so that the structure of the rotor is relatively complex, and it is not conducive to the molding of the current collecting ring.

[0004] Therefore, there is an urgent need for a new current collecting ring and a wind turbine generator SUMMARY

[0005] The present application provides a current collecting ring and a wind turbine generator, which can meet the requirement of electric energy transmission, avoid the phenomenon of cable twisting during the yaw motion of the wind turbine generator, and simplify the rotor assembly, which is conducive to the molding of the current collecting ring.

[0006] In one aspect, the present application provides a current collecting ring, comprising: a rotor assembly, comprising a rotating shaft and a plurality of rotor units arranged in pairs and spaced apart in the axial direction of the rotating shaft, each rotor unit comprising two or more slip rings insulatedly connected with the rotating shaft in the axial direction, and the slip rings of one of the rotor units arranged in pairs are connected in series with the corresponding slip rings of the other rotor unit; and a stator assembly coaxially arranged with the rotor assembly, the stator assembly comprising a plurality of stator units corresponding to the rotor units, the corresponding rotor units and stator units being coaxially arranged and rotationally connected, each stator unit comprising a stator support and a plurality of ring assemblies arranged on the stator support and spaced apart in the axial direction, each ring assembly comprising a ring plate, a brush assembly arranged on the ring plate, and a busbar electrically connected with the brush assembly, and each brush assembly being in contact with and electrically connected with the corresponding slip ring.

[0007] According to an aspect of the present application, the slip ring further comprises a driving component, which cooperates with the rotor assembly to drive the rotor assembly as a whole to rotate relative to each stator unit.

[0008] According to an aspect of the present application, the slip ring further comprises a transmission component, the driving component is connected to the rotating shaft through the transmission component to drive the rotating shaft to rotate each rotor unit relative to the corresponding stator unit.

[0009] According to an aspect of the present application, the transmission component comprises a first transmission wheel and a second transmission wheel in contact and transmission cooperation with each other, the first transmission wheel is connected to the rotating shaft, the second transmission wheel is connected to the driving component, and the first transmission wheel and the second transmission wheel are respectively a gear or a friction wheel.

[0010] According to an aspect of the present application, the transmission component comprises a first transmission wheel, a second transmission wheel and a traction component in transmission cooperation with the first transmission wheel and the second transmission wheel respectively, the first transmission wheel is connected to the rotating shaft, the second transmission wheel is connected to the driving component, and the traction component is a transmission belt or a transmission chain.

[0011] According to an aspect of the present application, the region where the rotating shaft is connected to the transmission component is located between the pair of rotor units.

[0012] According to an aspect of the present application, the slip ring further comprises a collector and a controller, the collector is configured to collect a relative static time value between the stator unit and the opposite rotor unit, and when the static time value exceeds a set threshold value, the controller controls the driving component to start to drive the rotor unit to rotate relative to the stator unit.

[0013] According to an aspect of the present application, the driving component drives the rotor assembly as a whole to rotate relative to each stator unit at a rotation frequency of 3-5 revolutions per minute.

[0014] According to an aspect of the present application, the slip ring further comprises a slewing bearing, and the stator support of each stator unit is connected to the rotating shaft through the slewing bearing.

[0015] According to an aspect of the present application, the stator support comprises a first top plate, a first bottom plate arranged in an axial direction opposite to the first top plate, and a first insulating rod connected between the first top plate and the first bottom plate, and the annular plate is mounted on the first insulating rod.

[0016] According to an aspect of the present application, the rotor unit further comprises a rotor support, the rotor support comprises a second top plate, a second bottom plate arranged in an axial direction opposite to the second top plate, and a second insulating rod connected between the second top plate and the second bottom plate, and each slip ring of the same rotor unit is mounted on the second insulating rod.

[0017] According to an aspect of the embodiment of the present application, the rotor assembly further comprises an insulating support, the insulating support being clamped between two adjacent slip rings of each rotor unit.

[0018] According to an aspect of the embodiment of the present application, the brush assembly comprises a plurality of brushes, the plurality of brushes being arranged on the annular plate in a spaced manner and in contact with and electrically connected to the same slip ring, and each brush is electrically connected to the same busbar.

[0019] According to an aspect of the embodiment of the present application, each annular plate is provided with at least two brush assemblies, each brush assembly comprising a plurality of brushes, the plurality of brushes being arranged on the annular plate in a spaced manner and in contact with and electrically connected to the same slip ring, and each brush of each brush assembly is connected to a corresponding busbar.

[0020] According to an aspect of the embodiment of the present application, the rotor assembly further comprises a connecting conductor, the slip ring of one of the pair of rotor units is connected in series with the corresponding slip ring of the other rotor unit through the connecting conductor.

[0021] According to another aspect of the embodiment of the present application, a wind turbine generator is provided, comprising: a tower; a nacelle arranged on the tower and rotatably connected to the tower; a cable comprising a first cable arranged on the nacelle and a second cable arranged on the tower, the current collector ring, the stator assembly comprising a first stator unit and a second stator unit corresponding to the rotor units, the first stator unit being insulatively connected to the nacelle and electrically connected to the first cable, and the second stator unit being insulatively connected to the tower and electrically connected to the second cable.

[0022] According to another aspect of the embodiment of the present application, the tower comprises a tower body and a support platform arranged in the tower body, the nacelle comprises a base and a cover, the nacelle is rotatably connected to the tower body through the base, the first stator unit is connected to the base, and the second stator unit is connected to the support platform.

[0023] The current collector ring and the wind turbine generator set provided by the embodiment of the present application comprise a rotor assembly and a stator assembly. The rotor assembly comprises a rotating shaft and rotor units arranged in pairs and spaced apart on the rotating shaft. The rotor units comprise two or more spaced-apart slip rings. The stator assembly comprises stator units corresponding to the rotor units. The stator units are coaxially arranged with the rotor units and rotationally coupled. The brush assemblies of the stator units can be in contact with and electrically connected to the slip rings of the corresponding rotor units. The current collector ring can be fixed to the nacelle through one of the stator units and electrically connected to the nacelle cable through the bus bar. The other stator unit is fixed to the tower and electrically connected to the tower cable through the bus bar. Since the slip rings of one of the rotor units arranged in pairs are connected in series with the slip rings of the other rotor unit, the first cable of the nacelle can be electrically connected to the bus bar of one of the stator units, and the second cable of the tower can be electrically connected to the bus bar of the other stator unit. The rotor assembly can meet the electrical connection requirements of the first cable in the nacelle and the second cable in the tower without extending multiple electrical connection rods, thereby simplifying the structure of the rotor assembly and facilitating the formation of the current collector ring. When the wind turbine generator set is yawed to rotate the nacelle relative to the tower, the stator unit fixed to the nacelle will rotate relative to the corresponding rotor unit to avoid cable twisting while ensuring electrical connection, thereby ensuring the safety of the power transmission cable on the basis of meeting the electrical energy transmission requirements.

[0024] Further, when the stator assembly and the rotor assembly are relatively static for a long time, the contact position of the brush assembly and the slip ring is prone to oxidation due to the external environment, which may cause the electrical contact to break, increase the contact resistance, and reduce the electrical energy transmission effect. The current collector ring provided by the embodiment of the present application comprises rotor units arranged in pairs and corresponding double stator units. When the stator assembly and the rotor assembly are relatively static for a long time, such as when the wind turbine generator set is not yawed for a long time, the rotor assembly can be manually or automatically controlled to rotate relative to the stator assembly as a whole, thereby driving the rotor units to rotate relative to the stator units, avoiding the risk of oxidation caused by long-term contact between the slip ring and the brush assembly, and improving the service life of the brush assembly and the slip ring. BRIEF DESCRIPTION OF DRAWINGS

[0025] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0026] Figure 1 is a structural schematic diagram of a wind turbine generator set according to an embodiment of the present application;

[0027] Figure 2 is a structural schematic diagram of a current collector ring according to an embodiment of the present application;

[0028] Figure 3 is a structural schematic diagram of a rotor assembly according to an embodiment of the present application;

[0029] Figure 4 Fig. 2 is a structural schematic diagram of a rotor unit according to another embodiment of the present application;

[0030] Figure 5 Fig. 3 is a structural schematic diagram of a stator unit according to an embodiment of the present application;

[0031] Figure 6 Fig. 4 is a structural schematic diagram of a ring assembly according to an embodiment of the present application;

[0032] Figure 7 Fig. 5 is a schematic diagram of the cooperation between a ring assembly and a slip ring according to an embodiment of the present application;

[0033] Figure 8 Fig. 6 is a structural schematic diagram of a collector ring according to another embodiment of the present application;

[0034] Figure 9 Fig. 7 is a schematic diagram of the cooperation between a driving component and a driven component according to another embodiment of the present application.

[0035] Wherein:

[0036] 100 - collector ring;

[0037] 10 - rotor assembly;

[0038] 11 - rotating shaft; 12 - rotor unit; 121 - slip ring; 122 - rotor support; 122a - second top plate; 122b - second bottom plate; 122c - second insulating rod; 123 - connecting conductor; 124 - insulating support;

[0039] 20 - stator assembly

[0040] 21 - stator unit; 21a - first stator unit; 21b - second stator unit; 211 - stator support; 211a - first top plate; 211b - first bottom plate; 211c - first insulating rod; 212 - ring assembly; 212a - ring plate; 212b - brush assembly; 212c - busbar; 212d - brush;

[0041] 30 - driving component; 40 - driven component; 41 - first driving wheel; 42 - second driving wheel; 43 - traction component;

[0042] 50 - slewing bearing; X - axial direction;

[0043] 200 - tower; 210 - tower body; 220 - support platform;

[0044] 300 - nacelle; 310 - base; 320 - cover;

[0045] 400 - generator;

[0046] 500 - impeller; 510 - hub; 520 - blade;

[0047] 600 - cable; 610 - first cable; 620 - second cable;

[0048] In the drawings, like reference numerals refer to like elements throughout. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. DETAILED DESCRIPTION

[0049] Features and exemplary embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring the present application. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present application. Particular embodiments described in this specification are included solely for their contribution to the understanding of the present application, and do not pose a substantial practical difficulty in practice. Features described herein can be combined in any suitable manner in one or more embodiments.

[0050] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the slip ring and the wind turbine generator set of the present application. In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] As Figure 1As shown, the embodiment of the present application provides a wind turbine, which comprises a tower 200, a nacelle 300, a rotor 500 and functional devices. The tower 200 is connected to a wind turbine foundation. The nacelle 300 is arranged on the tower 200. The rotor 500 is arranged on the nacelle 300 and can rotate relative to the nacelle 300 under the action of wind. The rotor 500 comprises a hub 510 and blades 520. The blades 520 are connected to the hub 510. In some optional embodiments, the functional devices can comprise at least one of a generator 400, a transformer and a converter. The generator 400 can be connected between the rotor 500 and a base of the nacelle 300. The rotor 500 can drive a rotor of the generator 400 to rotate relative to a stator under the action of wind, so as to convert wind energy into electric energy. The generator 400, the transformer and the converter need to transmit electric energy to a wind power network through a cable. Therefore, the wind turbine further comprises a cable 600. The cable 600 comprises a first cable 610 arranged on the nacelle 300 and a second cable 620 arranged on the tower 200. The first cable 610 can be electrically connected with the functional devices such as the generator 400, the transformer and the converter. The second cable 620 is used to be electrically connected with the first cable 610, so as to transmit electric energy converted by the functional devices to a predetermined wind power network.

[0052] During the operation of the wind turbine, when the change of wind direction reaches a certain degree, the wind turbine performs corresponding yawing action, so that the nacelle 300 drives the end of the first cable 610 connected with the functional devices such as the generator 400 to rotate by a certain angle. If the second cable 620 is directly electrically connected with the first cable 610, when the nacelle 300 drives the first cable 610 to rotate relative to the tower 200, the first cable 610 will drive the second cable 620 to twist, and the cable twisting phenomenon occurs. The cable twisting phenomenon caused by the cable 600 will continuously accumulate. Long-time cable twisting action will cause the first cable 610 and / or the second cable 620 to be broken, causing an accident.

[0053] Therefore, on the basis of ensuring that the first cable 610 is electrically connected with the second cable 620 to transmit electric energy, in order to avoid the first cable 610 and the second cable 620 electrically connected therewith from appearing the cable twisting phenomenon, the embodiment of the present application further provides a current collector ring 100. The current collector ring 100 is used to connect the first cable 610 and the second cable 620, which can meet the transmission requirement of electric energy, and can avoid the cable twisting phenomenon during the yawing movement of the wind turbine, so as to ensure the safety of the cable 600. The current collector ring 100 provided by the embodiment of the present application can be produced and sold as an independent component. Of course, it can also be used in the above-mentioned wind turbine and serve as a component of the wind turbine.

[0054] In order to better understand the present application, the following will be described in combination with Figures 2 to 9 The current collector ring 100 and the wind turbine according to the embodiment of the present application will be described in detail.

[0055] As shown in Figure 2 and Figure 3 The slip ring 100 provided by the embodiment of the present application comprises a rotor assembly 10 and a stator assembly 20. The rotor assembly 10 comprises a rotating shaft 11 and a plurality of rotor units 12 arranged in pairs and spaced apart along the axial direction X of the rotating shaft 11. Each rotor unit 12 comprises two or more slip rings 121 spaced apart along the axial direction X and insulatedly connected to the rotating shaft 11. The slip rings 121 of one of the rotor units 12 are connected in series with the slip rings 121 of the other rotor unit 12. The stator assembly 20 is coaxially arranged with the rotor assembly 10 and comprises a plurality of stator units 21 corresponding to the rotor units 12. The corresponding rotor unit 12 and stator unit 21 are coaxially arranged and rotationally connected. The stator unit 21 comprises a stator support 211 and a plurality of ring assemblies 212 arranged on the stator support 211 and spaced apart along the axial direction X. Each ring assembly 212 comprises a ring plate 212a, a brush assembly 212b arranged on the ring plate 212a, and a busbar 212c electrically connected to the brush assembly 212b. Each brush assembly 212b is in contact with and electrically connected to the corresponding slip ring 121.

[0056] When the slip ring 100 is used in a wind turbine generator system, one of the stator units 21 is insulatedly connected to the nacelle 300 and electrically connected to the first cable 610 through the busbar 212c, and the other stator unit 21 is insulatedly connected to the tower 200 and electrically connected to the second cable 620.

[0057] In order to more clearly illustrate the connection relationship between the current collector ring 100 and other components when the current collector ring 100 is used in the wind turbine generator set, the stator assembly 20 is in one-to-one correspondence with the rotor unit 12, and the stator unit 21 specifically includes a first stator unit 21a and a second stator unit 21b. The first stator unit 21a is insulatively connected to the nacelle 300 and electrically connected to the first cable 610. The second stator unit 21b is insulatively connected to the tower 200 and electrically connected to the second cable 620. Since the slip ring 121 of one of the pair of rotor units 12 is in series connection with the corresponding slip ring 121 of the other rotor unit 12, and the stator unit 21 is in rotational connection with the corresponding rotor unit 12 and is always in electrical connection between the corresponding slip ring 121 through the brush assembly 212b. When the wind turbine generator set is yawed so that the nacelle 300 rotates relative to the tower 200, the first stator unit 21a will rotate with the nacelle 300. Since the first stator unit 21a is always in electrical contact with the corresponding slip ring 121 of the rotor unit 12 through the brush assembly 212b, the electrical energy of the functional devices such as the generator 400 is transmitted to the first stator unit 21a through the first cable 610, then to the corresponding rotor unit 12 through the first stator unit 21a, to the other rotor unit 12 connected with the corresponding slip ring 121 through the slip ring 121 of the rotor unit 12, then to the second stator unit 21b through the other rotor unit 12, and then to the second cable 620 through the second stator unit 21b. The rotor assembly 10 can meet the electrical connection requirements of the first cable 610 in the nacelle 300 and the second cable 620 in the tower 200 without extending multiple electrical connection rods, simplifying the structure of the rotor assembly 10 and facilitating the molding of the current collector ring 100.

[0058] Since the first stator unit 21a and the second stator unit 21b are both in rotational cooperation with the corresponding rotor unit 12, when the nacelle 300 drives the generator 400 and the first cable 610 to rotate relative to the tower 200, the second cable 620 will not rotate with the first cable 610. On the basis of meeting the electrical energy transmission requirements, the first stator unit 21a fixed to the nacelle 300 will rotate with the nacelle 300 relative to the corresponding rotor unit 12, avoiding the phenomenon of cable twisting. On the basis of meeting the electrical energy transmission requirements, the safety of the power transmission cable is ensured.

[0059] In addition, since the pair of rotor units 12 are arranged on the rotating shaft 11, the rotating shaft 11 drives the rotor assembly 10 as a whole to rotate relative to the stator assembly 20 through manual or automatic control, so that when the wind turbine generator set is not yawed for a long time, the rotor unit 12 can be driven to rotate relative to the stator unit 21 in this way, avoiding the problem of high contact resistance caused by oxidation due to long-time contact between the slip ring 121 and the brush assembly 212b, and improving the service life of the brush assembly 212b and the slip ring 121.

[0060] Optionally, the rotor assembly 10 of the slip ring 100 provided in the embodiments of the invention can be a solid columnar structure or a hollow tubular structure.

[0061] As an optional implementation, the slip ring 100 provided in this embodiment of the invention can have its paired rotor units 12 positioned at a distance along the axial direction X, which can be set according to the positions of the first cable 610 and the second cable 620.

[0062] In some alternative embodiments, the two rotor units 12 arranged in pairs may have identical structures. The dimensions can be adjusted according to connection and fit requirements.

[0063] Optionally, in the slip ring 100 provided in this embodiment of the invention, the slip ring 121 of each rotor unit 12 can be a circular ring structure. An insulating layer can be provided on the surface of the slip ring 121 facing the rotating shaft 11, and the slip ring can be connected to the rotating shaft 11 through the insulating layer. For example, it can be connected by bonding the slip ring to the rotating shaft with an insulating adhesive layer, or it can be connected to each other by locking with an insulating pin.

[0064] like Figure 4 As shown, in some other embodiments, the rotor unit 12 may also include a rotor support 122. The rotor support 122 includes a second top plate 122a, a second bottom plate 122b, and a second insulating rod 122c connected between the second top plate 122a and the second bottom plate 122b, which are arranged opposite each other in the axial direction X. Each slip ring 100 of the same rotor support 122 is mounted on the second insulating rod 122c. By including the rotor support 122 in the rotor unit 12, each slip ring 121 can be first mounted on the rotor support 122, and then fixedly or detachably connected to the rotating shaft 11 through the rotor support 122. Specifically, the rotor support 122 can be fixedly or detachably connected to the rotating shaft 11 through the second top plate 122a and / or the second bottom plate 122b.

[0065] For example, the slip ring 121 may have the same number of mounting holes as the second insulating rods 122c of the rotor support 122, with each second insulating rod 122c passing through each slip ring 121 of the same rotor unit 12 to mount the slip ring 121.

[0066] In some optional embodiments, the slip ring 100 provided in this embodiment of the invention further includes an insulating support 124 in its rotor assembly 10. The insulating support 124 is sandwiched between two adjacent slip rings 121 of each rotor unit 12. By providing the insulating support 124, it can provide support and insulation separation between two adjacent slip rings 121, and avoid short circuit between two adjacent slip rings 121.

[0067] In some alternative embodiments, the insulating support 124 can be sleeved on the second insulating rod 122c, and the insulating support 124 can be provided with perforations corresponding to the insulating support rods 124, the insulating support rods 124 pass through the insulating supports 124 and make the insulating supports 124 clamped between two adjacent slip rings 121.

[0068] As shown in Figures 2 to 4 As an alternative embodiment, the rotor unit 12 provided by the embodiment of the application can include a number of slip rings 121 according to the requirement of power transmission. In order to better understand the current collector 100 provided by the embodiment of the application, the following will take an example of three slip rings 121 included in each rotor unit 12 for description.

[0069] Exemplarily, the three slip rings 121 included in the rotor unit 12 can be arranged at intervals in the axial direction X of the shaft 11, and the three slip rings 121 can correspond to U, V and W three-phase wirings in the winding of the generator. Each slip ring 121 is connected to the corresponding generator wiring through the brush assembly 212b and the busbar 212c of the corresponding stator unit 21.

[0070] In the pair of rotor units 12, the slip ring 121 corresponding to the U-phase wiring of one rotor unit 12 is electrically connected to the slip ring 121 corresponding to the U-phase wiring of the other rotor unit 12, the slip rings 121 corresponding to the V-phase wirings of the two rotor units 12 are electrically connected to each other, and the slip rings 121 corresponding to the W-phase wirings of the two rotor units 12 are electrically connected to each other.

[0071] In some alternative embodiments, in order to ensure the electrical connection requirement between the corresponding slip rings 121 of the rotor unit 12, the rotor assembly 10 further includes a connecting conductor 123. In the pair of rotor units 12, the slip ring 121 of one rotor unit 12 is connected in series with the slip ring 121 of the other rotor unit 12 through the connecting conductor 123, so as to ensure the electrical connection requirement between the corresponding slip rings 121.

[0072] As an alternative embodiment, the connecting conductor 123 electrically connected to the slip ring 121 can adopt the form of a guide rod or a wire extending along the axial direction X, and can be connected to the corresponding slip ring 121 in the form of welding or the like.

[0073] As shown in Figure 2 and Figure 5As shown, as an optional embodiment, the slip ring 100 provided by the above-mentioned embodiments of the present application can have the same number of annular assemblies 212 as the number of slip rings 121 of the corresponding rotor unit 12, and the stator unit 21 can be entirely sleeved on the outer periphery of the rotor assembly 10, and each annular assembly 212 is arranged around the corresponding slip ring 121 and is in contact and electrically connected with the corresponding slip ring 121 through the contact between the brush assembly 212b and the corresponding slip ring 121.

[0074] In some optional embodiments, the slip ring 100 provided by the embodiments of the present application can have the annular plate 212a coaxial with the corresponding slip ring 121, and the brush assembly 212b can be fixedly or detachably connected to the annular plate 212a, and the brush assembly 212b can be located between the annular plate 212a and the slip ring 121 on one side of the annular plate 212a in the radial direction of the annular plate 212a and in contact and electrically connected with the slip ring 121.

[0075] Optionally, the bus bar 212c is arranged on the annular plate 212a, which can be directly arranged on the annular plate 212a or indirectly connected to the annular plate 212a through a support or the like, as long as the connection requirement between the annular plate 212a and the bus bar 212c can be met. The brush assembly 212b is connected with the bus bar 212c on the other side of the annular plate 212a in the radial direction of the annular plate 212a, and the bus bar 212c can be used to connect with the cable 600, so that the electric energy can be transmitted between the cable 600 and the slip ring 100.

[0076] As an optional embodiment, in order to facilitate the rotational connection between the stator unit 21 and the rotating shaft 11, the slip ring 100 can further comprise a slewing bearing 50, and the stator support 211 of each stator unit 21 is connected with the rotating shaft 11 through the slewing bearing 50, for example, the inner ring of the slewing bearing 50 can be connected with the rotating shaft 11 and the outer ring can be connected with the stator support 211, when the nacelle 300 rotates relative to the tower 200, the stator unit 21 can be driven to rotate relative to the rotating shaft 11, and since the position of the rotor unit 12 relative to the rotating shaft 11 is unchanged, the stator unit 21 rotates relative to the rotor unit 12, which ensures the rotational connection requirement between the two, and at the same time, during the rotation of the stator unit 21 relative to the rotor unit 12, the brush assembly 212b is always in contact and electrically connected with the slip ring 121, which ensures the electric energy transmission requirement and avoids the cable twisting.

[0077] As an optional implementation, the slip ring 100 provided by the embodiment of the present application has the stator support 211 including the first top plate 211a, the first bottom plate 211b arranged opposite to each other in the axial direction X, and the first insulating rod 211c connected between the first top plate 211a and the first bottom plate 211b, and the annular plate 212a is installed on the first insulating rod 211c. The stator support 211 has the above structure, which is beneficial to the installation of each annular assembly of the stator unit 21 and the electrical connection between the stator unit 21 and the rotating shaft 11.

[0078] In some optional embodiments, the same number of mounting holes as the first insulating rod 211c can be arranged on the annular plate 212a, and the first insulating rod 211c passes through each annular plate 212a to install the annular assembly 212.

[0079] As an optional implementation, the stator unit 21 can also include the insulating support 124, and the insulating support 124 is clamped between the adjacent two annular plates 212a of each rotor unit 12. By arranging the insulating support 124, the adjacent two annular plates 212a can be supported and insulated, so as to avoid the short circuit between the adjacent two rotor plates.

[0080] As shown in Figure 6 and Figure 7 In some optional embodiments, the slip ring 100 provided by the embodiment of the present application has the brush assembly 212b included in the stator assembly 20, which can include a plurality of brushes 212d. The plurality of brushes 212d are arranged at intervals on the annular plate 212a and are in contact with and electrically connected to the same slip ring 121, and each brush 212d is electrically connected to the same busbar 212c. By arranging the brush assembly 212b to include a plurality of brushes 212d, and each brush 212d is electrically connected to the slip ring 121 and the busbar 212c, the reliability of the electrical contact between the brush assembly 212b and the corresponding slip ring 121 can be ensured.

[0081] In addition, by the above arrangement, the contact area between the brush assembly 212b and the slip ring 121 can be increased, the resistance at the contact position between the brush assembly 212b and the slip ring 121 can be reduced, the damage of the electrical energy during transmission in the slip ring 100 can be reduced, and the power generation benefit of the wind turbine generator system can be improved. At the same time, the above arrangement can also make that when one or more than two brushes 212d are damaged to cause defects in the electrical connection between the brush 212d and the slip ring 121 or the busbar 212c, only the corresponding damaged brush 212d needs to be replaced, without the need to replace the entire brush assembly 212b, thereby saving the maintenance cost of the brush assembly 212b.

[0082] As an optional implementation, the slip ring 100 provided by the embodiment of the present application can be provided with only one brush assembly 212b on each annular plate 212a, of course, more than two brush assemblies 212b can be provided, for example, in some examples, two brush assemblies 212b can be provided on each annular plate 212a 2 1 2 a 2 1 2 b 2 1 2 b 2 1 2 d 2 1 2 d

[0083] As Figure 8 shown, as an optional implementation, the slip ring 100 provided by the above-mentioned embodiments of the present application further comprises a driving component 30, the driving component 30 cooperates with the rotor assembly 10 to drive the rotor assembly 10 to rotate relative to each stator unit 21. Through the above-mentioned setting, the control of the rotor assembly 10 can be facilitated, so that the slip ring 121 of the rotor unit 12 can rotate relative to the brush assembly 212b of the stator unit 21, and the oxidation of the contact surface of the slip ring 121 and the brush assembly 212b caused by the long-time contact of the two can be avoided. When the wind turbine generator set is not yawed for a long time, the rotor unit 12 can be driven to rotate relative to the stator unit 21 in this way, so that the problem of large contact resistance caused by oxidation due to long-time contact of the slip ring 121 and the brush assembly 212b can be avoided, and the service life of the brush assembly 212b and the slip ring 121 can be improved.

[0084] In some optional embodiments, the slip ring 100 provided by the embodiment of the present application further comprises a transmission component 40, the driving component 30 is connected with the rotating shaft 11 through the transmission component 40 to drive the rotating shaft 11 to drive each rotor unit 12 to rotate relative to the corresponding stator unit 21. Through the setting of the transmission component 40, the transmission of the kinetic energy of the driving component 30 can be facilitated, and the rotation of the rotor unit 12 relative to the stator unit 21 driven by the rotating shaft 11 can be facilitated.

[0085] As an optional implementation, the transmission component 40 can include a first transmission wheel 41 and a second transmission wheel 42 in contact and transmission cooperation, the first transmission wheel 41 is connected to the rotating shaft 11, the second transmission wheel 42 is connected to the driving component 30, the first transmission wheel 41 and the second transmission wheel 42 are gears, and the first transmission wheel 41 and the second transmission wheel 42 are in meshing. The kinetic energy of the driving component 30 is transmitted to the first transmission wheel 41 through the second transmission wheel 42, and since the first transmission wheel 41 is connected to the rotating shaft 11, the rotating shaft 11 and the rotor unit 12 connected to the rotating shaft 11 are driven to rotate relative to the stator unit 21, thereby avoiding the problem of large contact resistance caused by oxidation due to long-time contact between the slip ring 121 and the brush assembly 212b.

[0086] It can be understood that when the first transmission wheel 41 and the second transmission wheel 42 are in contact and transmission cooperation, the first transmission wheel 41 and the second transmission wheel 42 are not limited to the form of gears, and in some other embodiments, the two can also adopt the form of friction wheels to realize the transmission of kinetic energy between the driving component 30 and the rotor assembly 10 by using friction.

[0087] It can be understood that the slip ring 100 provided by the embodiment of the application is not limited to the mode of contact and transmission cooperation of the first transmission wheel 41 and the second transmission wheel 42.

[0088] As shown in FIG. 1, Figure 9 In some embodiments, the transmission component 40 can also include the first transmission wheel 41, the second transmission wheel 42 and the traction component 43 in transmission cooperation with the first transmission wheel 41 and the second transmission wheel 42, respectively, which are distributed at intervals, the first transmission wheel 41 is connected to the rotating shaft 11, the second transmission wheel 42 is connected to the driving component 30, and the traction component 43 is a transmission belt. That is, the transmission component 40 can also include the traction component 43, which realizes the connection between the first transmission wheel 41 and the second transmission wheel 42 at an interval, and further realizes the transmission of kinetic energy between the driving component 30 and the rotating assembly.

[0089] When the traction component 43 adopts a transmission belt, it can be a toothed belt, and of course it can also be a flat belt or a V-belt, as long as it can be in transmission cooperation with the first transmission wheel 41 and the second transmission wheel 42 to realize the transmission requirement of kinetic energy.

[0090] It can be understood that the traction component 43 adopting a transmission belt is only an optional implementation, and in some other embodiments, the traction component 43 of the slip ring 100 provided by the embodiment of the application can also adopt the form of a transmission chain, at this time, the first transmission wheel 41 and the second transmission wheel 42 can adopt the form of a sprocket to realize transmission connection with the traction component 43.

[0091] As an optional implementation, the driving component 30 can be a servo motor, which is beneficial for control.

[0092] As an optional implementation, the slip ring 100 further comprises a collector and a controller. The collector is configured to collect a relative static time value between the stator unit 21 and the opposite rotor unit 12. When the relative static time value exceeds a set threshold value, the controller controls the driving component 30 to start and drive the rotor unit 12 to rotate relative to the stator unit 21, thereby avoiding the problem of large contact resistance caused by oxidation due to long-time contact between the slip ring 121 and the brush assembly 212b.

[0093] As an optional implementation, the threshold value can be 24 hours. When the relative static time value between the stator unit 21 and the opposite rotor unit 12 exceeds 24 hours, the driving component 30 is controlled to start and drive the rotor unit 12 to rotate relative to the stator unit 21, thereby avoiding the oxidation problem.

[0094] As an optional implementation, the driving component 30 drives the rotor assembly 10 to rotate relative to each stator unit 21 at a rotation frequency of 3-5 revolutions per minute. Any value between 3 revolutions per minute and 5 revolutions per minute can be used, including the two end values of 3 revolutions per minute and 5 revolutions per minute. This allows the rotor assembly 10 to rotate relative to the stator unit 21 at a low rotation speed, which can avoid oxidation and reduce wear on the contact surface between the slip ring 121 and the brush assembly 212b.

[0095] In some optional embodiments, the slip ring 100 has the transmission component 40 connected to the rotating shaft 11 located between the pair of rotor units 12. Through the above arrangement, the pair of rotor units 12 can be balanced to avoid the problem of rotation jamming or excessive wear between the rotating shaft 11 and the stator unit 21 caused by the unbalanced load of the driving component 30.

[0096] The slip ring 100 provided by the embodiment of the present application adopts the form of the double stator units 21 rotatingly matched with the rotor assembly 10, one of the stator units 21 is fixed to the nacelle 300 and electrically connected with the first cable 610 in the nacelle 300, the other stator unit 21 is fixed to the tower 200 and electrically connected with the second cable 620 in the tower 200, and each stator unit 21 is rotatingly matched with and electrically connected with the corresponding rotor unit 12, which can rotate relative to the rotor unit 12 while ensuring the electrical connection relationship when the nacelle 300 is yawed, effectively avoiding the cable twisting of the first cable 610 and the second cable 620. Moreover, the driving component 30 arranged correspondingly can drive the rotor assembly 10 to rotate relative to each stator unit 21, avoiding the problem of large contact resistance caused by oxidation due to long-time contact between the slip ring 121 and the brush assembly 212b, and optimizing the performance of the slip ring 100.

[0097] The wind turbine provided by the embodiment of the present application can meet the electrical connection requirements of the first cable 610 and the second cable 620, while avoiding the cable twisting phenomenon during the yawing movement, so that the first cable 610 and the second cable 620 do not need to be configured too high, thereby reducing the cost on the basis of ensuring the safety performance. Moreover, the driving component 30 arranged correspondingly in the slip ring 100 can drive the rotor assembly 10 to rotate relative to each stator unit 21, avoiding the problem of large contact resistance caused by oxidation due to long-time contact between the slip ring 121 and the brush assembly 212b, so that the wind turbine has higher power generation efficiency.

[0098] As an optional implementation, the wind turbine provided by the embodiment of the present application, the tower 200 includes a tower body 210 and a support platform 220 arranged in the tower body 210, the nacelle 300 includes a base 310 and a cover 320, the nacelle 300 is rotationally connected with the tower body 210 through the base 310, the first stator unit 21a is connected to the base 310, and the second stator unit 21 is connected to the support platform 220. Through the above arrangement, the installation of the stator unit 21 is facilitated, and when the driving component 30 is included, the driving component 30 can be connected to the support platform 220, thereby ensuring the stability of the installation of the driving component 30.

[0099] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application and equivalents thereof without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A collector ring (100), characterized in that, The collector ring (100) comprises: a rotor assembly (10) comprising a rotating shaft (11) and a plurality of rotor units (12) arranged in pairs and spaced apart along an axial direction (X) of the rotating shaft (11), each of the rotor units (12) comprising two or more slip rings (121) spaced apart along the axial direction (X) and respectively insulatedly connected to the rotating shaft (11), the slip rings (121) of one of the rotor units (12) in a pair are connected in series with the slip rings (121) of the other rotor unit (12) in the pair; a stator assembly (20) coaxially arranged with the rotor assembly (10), the stator assembly (20) comprising a plurality of stator units (21) corresponding to the rotor units (12) respectively, each of the stator units (21) being rotatably connected to a corresponding rotor unit (12), each of the stator units (21) comprising a stator support (211) and a plurality of ring assemblies (212) arranged on the stator support (211) and spaced apart along the axial direction (X), each of the ring assemblies (212) comprising a ring-shaped plate (212a), a brush assembly (212b) arranged on the ring-shaped plate (212a), and a busbar (212c) electrically connected to the brush assembly (212b), each of the brush assemblies (212b) being in contact with and electrically connected to a corresponding slip ring (121).

2. The collector ring (100) according to claim 1, characterized in that The collector ring (100) further comprises a driving component (30) configured to drive the rotor assembly (10) to rotate relative to each of the stator units (21).

3. The collector ring (100) of claim 2, characterized in that The collector ring (100) further comprises a transmission component (40), the driving component (30) is connected to the rotating shaft (11) through the transmission component (40) to drive the rotating shaft (11) to drive each of the rotor units (12) to rotate relative to a corresponding stator unit (21).

4. The collector ring (100) of claim 3, characterized in that The transmission component (40) comprises a first transmission wheel (41) and a second transmission wheel (42) in contact and transmission cooperation with each other, the first transmission wheel (41) is connected to the rotating shaft (11), the second transmission wheel (42) is connected to the driving component (30), the first transmission wheel (41) and the second transmission wheel (42) are gears or friction wheels respectively. Alternatively, the transmission component (40) comprises a first transmission wheel (41), a second transmission wheel (42) and a traction component (43) in transmission cooperation with the first transmission wheel (41) and the second transmission wheel (42) respectively, the first transmission wheel (41) is connected to the rotating shaft (11), the second transmission wheel (42) is connected to the driving component (30), the traction component (43) is a transmission belt or a transmission chain.

5. The collector ring (100) of claim 3, wherein, The area where the rotating shaft (11) is connected to the transmission component (40) is located between the rotor units (12) arranged in pairs.

6. The collector ring (100) of claim 2, wherein, The slip ring (100) further comprises a collector configured to collect a relative static time value between the stator unit (21) and the opposite rotor unit (12), and a controller configured to control a driving component (30) to start driving the rotor unit (12) to rotate relative to the stator unit (21) when the relative static time value exceeds a set threshold value.

7. The collector ring (100) of claim 2, wherein, The driving component (30) drives the rotor assembly (10) to rotate relative to each stator unit (21) at a rotation frequency of 3-5 rotations per minute.

8. The collector ring (100) according to any one of claims 1 to 7, characterized in that The slip ring (100) further comprises a slewing bearing (50) connected between the stator support (211) of each stator unit (21) and the shaft (11).

9. The collector ring (100) according to any one of claims 1 to 7, characterized in that The stator support (211) comprises a first top plate (211a), a first bottom plate (211b) arranged opposite in the axial direction (X), and a first insulating rod (211c) connected between the first top plate (211a) and the first bottom plate (211b), and the annular plate (212a) is mounted on the first insulating rod (211c).

10. The collector ring (100) according to any one of claims 1 to 7, characterized in that The rotor unit (12) further comprises a rotor support (122) comprising a second top plate (122a), a second bottom plate (122b) arranged opposite in the axial direction (X), and a second insulating rod (122c) connected between the second top plate (122a) and the second bottom plate (122b), and each slip ring (100) of the same rotor unit (12) is mounted on the second insulating rod (122c).

11. The collector ring (100) of claim 10, characterized in that The rotor assembly (10) further comprises an insulating support (124) clamped between adjacent two slip rings (121) of each rotor unit (12).

12. The collector ring (100) according to any one of claims 1 to 7, characterized in that The brush assembly (212b) comprises a plurality of brushes (212d) arranged at intervals on the annular plate (212a) and in contact with and electrically connected to the same slip ring (121), and each brush (212d) is electrically connected to the same busbar (212c). Alternatively, at least two brush assemblies (212b) are provided on each annular plate (212a), each brush assembly (212b) comprises a plurality of brushes (212d) arranged at intervals on the annular plate (212a) and in contact with and electrically connected to the same slip ring (121), and each brush (212d) of each brush assembly (212b) is connected to the corresponding busbar (212c).

13. The collector ring (100) according to any one of claims 1 to 7, characterized in that The rotor assembly (10) further comprises a connecting conductor (123), and the slip ring (121) of one of the pair of rotor units (12) is connected in series with the corresponding slip ring (121) of the other rotor unit (12) through the connecting conductor (123).

14. A wind power unit, characterized in that Comprise: a tower (200); A machine cabin (300) is arranged on the tower (200) and rotationally connected with the tower (200); A cable (600) includes a first cable (610) arranged on the machine cabin (300) and a second cable (620) arranged on the tower (200); The slip ring (100) according to any one of claims 1 to 13, wherein the stator assembly (20) includes first stator units (21a) and second stator units (21b) corresponding to the rotor units (12), the first stator units (21a) are insulatively connected to the machine cabin (300) and electrically connected with the first cable (610), and the second stator units (21b) are insulatively connected to the tower (200) and electrically connected with the second cable (620).

15. A wind power plant according to claim 14, characterised in that The tower (200) includes a tower body (210) and a support platform (220) arranged in the tower body (210), the machine cabin (300) includes a base (310) and a cover (320), the machine cabin (300) is rotationally connected with the tower body (210) through the base (310), the first stator units (21a) are connected to the base (310), and the second stator units (21b) are connected to the support platform (220).

Images