CN113285320B

CN113285320B - Rotary conductive device and wind generating set

Info

Publication number: CN113285320B
Application number: CN202010338970.8A
Authority: CN
Inventors: 褚建坤; 顾伟峰; 岑先富; 拜亮
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2023-05-16
Anticipated expiration: 2040-04-26
Also published as: CN113285320A

Abstract

The invention relates to a rotary conductive device and a wind generating set. The rotary conductive device includes: the fixing piece comprises a conductive ring and a conductive piece arranged on the conductive ring, and the conductive piece is used for being electrically connected with a second cable fixed outside; the rotating piece is coaxially arranged with the fixing piece and can rotate relative to the fixing piece, the rotating piece comprises a shell and an electric brush arranged on the shell, the electric brush is used for being electrically connected with a first cable which rotates synchronously with the outside, and the electric brush is in sliding contact with the conducting ring so as to form a conducting channel for electrically connecting the first cable with a second cable. The rotary conductive device can form a conductive channel capable of being movably connected between cables in relative motion, so that the problems of collision, abrasion, winding and the like between the cables or between the cables and surrounding platforms are avoided, and the reliability of power transmission is improved.

Description

Rotary conductive device and wind generating set

Technical Field

The invention relates to the technical field of wind power generation, in particular to a rotary conductive device and a wind generating set.

Background

The cables running loosely in large electrical equipment, such as the cables of a wind power plant, extend from the nacelle to the bottom of the tower, with a large number of cables, typically more than 20. When the cabin rotates relative to the tower, the cables are driven to twist, so that the problems of collision, abrasion, winding and the like between a plurality of cables or between the cables and surrounding platforms are easy to occur, and faults such as cable short circuit and the like can occur under serious conditions. Therefore, cable disassembly measures are usually needed, and the cable needs to be reserved with a length allowance, so that the use cost of the cable is increased, and the workload of later maintenance is increased.

Disclosure of Invention

The invention aims to provide a rotary conductive device and a wind generating set, wherein the rotary conductive device can form a conductive channel capable of being movably connected between cables which move relatively.

In one aspect, an embodiment of the present invention provides a rotary conductive device, including: the fixing piece comprises a conductive ring and a conductive piece arranged on the conductive ring, and the conductive piece is used for being electrically connected with a second cable fixed outside; the rotating piece is coaxially arranged with the fixing piece and can rotate relative to the fixing piece, the rotating piece comprises a shell and an electric brush arranged on the shell, the electric brush is used for being electrically connected with a first cable which rotates synchronously with the outside, and the electric brush is in sliding contact with the conducting ring so as to form a conducting channel for electrically connecting the first cable with a second cable.

According to one aspect of the invention, the brush is embedded in the wall of the housing and is connected with the housing in an insulating manner, a first connecting terminal electrically connected with the first cable is arranged on one side of the brush away from the conducting ring, and the brush is in sliding contact with the conducting ring on one side of the brush facing the conducting ring.

According to one aspect of the invention, the outer shell is sleeved on the outer peripheral side of the conductive ring, and the conductive member is disposed on the inner peripheral side of the conductive ring.

According to one aspect of the invention, the conductive ring is sleeved on the outer peripheral side of the housing, and the conductive member is disposed on the outer peripheral side of the conductive ring.

According to one aspect of the invention, the conductive ring is provided with a connecting ear, one end of the conductive member is connected with the connecting ear, and the other end is provided with a second connection terminal electrically connected with the second cable.

According to one aspect of the invention, the number of the electric brushes is a plurality, and the electric brushes are arranged in rows and columns in the circumferential direction and the axial direction of the shell; the number of the conductive rings is multiple, and the multiple conductive rings are arranged at intervals along the axial direction of the fixing piece; in the axial direction, a plurality of conducting rings are in one-to-one correspondence with the plurality of rows of brushes and are respectively in sliding contact with the brushes.

According to one aspect of the invention, each conductive ring is provided with at least two conductive members which are distributed at intervals along the circumferential direction of the conductive ring, and the conductive members of the plurality of conductive rings are arranged in a staggered manner along the circumferential direction of the fixing member.

According to one aspect of the invention, the fixing member further comprises a supporting seat, the supporting seat comprises a fixing shaft and a flange plate arranged at one end of the fixing shaft, the fixing shaft is coaxially arranged with the shell, and the conducting ring is connected with the flange plate through the conducting member to limit the conducting ring to move along the axial direction of the fixing member.

According to one aspect of the invention, the conductive member is in insulated connection with the flange.

According to one aspect of the present invention, a first bearing and a second bearing are respectively provided between both axial ends of the fixed shaft and the housing.

On the other hand, the invention also provides a wind generating set, which comprises a tower, wherein a second cable is fixedly laid in the tower; the engine room is arranged at the top end of the tower, and the engine room can rotate relative to the tower barrel; a generator provided on one side of the nacelle, the generator having a first cable led out from the nacelle; the rotary electric conduction device is characterized in that a rotating piece of the rotary electric conduction device is connected with the engine room, a fixing piece of the rotary electric conduction device is connected with the tower, and the first cable is movably and electrically connected with the second cable through the rotary electric conduction device.

According to one aspect of the invention, the generator comprises a 3 n-phase winding unit, the first cable comprises 3n×m cables, the rotary conductive device comprises 3n conductive rings and brushes, the 3n conductive rings are arranged at intervals along the axial direction of the fixed part, the brushes are distributed in 3n rows and m columns along the circumferential direction and the axial direction of the rotating part, each conductive ring is provided with p conductive parts at intervals along the circumferential direction of the conductive ring, each row of brushes, each conductive ring and the corresponding p conductive parts form a conductive channel, the second cable comprises 3n×p cables, and n, m and p are positive integers.

According to the rotary conductive device provided by the invention, the electric brush is arranged on the rotating part, the conductive ring in sliding contact with the electric brush and the conductive part connected with the conductive ring are arranged on the fixed part, the electric brush is connected with the first cable which rotates synchronously, and the conductive part is connected with the second cable which moves relatively, so that a conductive channel capable of being movably connected is formed between the cables, the problems of collision, abrasion, winding and the like between the cables or between the cables and surrounding platforms are avoided, and the reliability of power transmission is improved. In addition, the cable does not need to be disconnected, the length allowance is not needed to be reserved for the cable, the use cost of the cable is reduced, and the workload of later maintenance is also reduced.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

FIG. 1 is a schematic view of a wind turbine generator system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a rotary conductive device according to an embodiment of the present invention;

FIG. 3 is a schematic view of the rotor of the rotary electric conduction device shown in FIG. 2;

FIG. 4 is a schematic view of the structure of the fixture in the rotary electric conduction device shown in FIG. 2;

FIG. 5 is a schematic view of the structure of the support base in the fixture shown in FIG. 4;

FIG. 6 is a schematic diagram illustrating an assembly effect of the conductive member and the flange of the fixing member shown in FIG. 4;

FIG. 7 is a schematic diagram illustrating an assembly effect of the conductive ring and the conductive member of the fixing member shown in FIG. 4;

fig. 8 is a schematic electrical schematic diagram of a phase winding unit of the generator of the wind power plant shown in fig. 1.

Reference numerals illustrate:

1-rotating the conductive device; 2-a cabin; 3-tower; a 4-generator; l1-a first cable; l2-a second cable;

11-a rotating member; 111-a housing; 111 a-an annular carrier; 111 b-cover plate; 111 c-a clamping part; 111 d-a second flange; 112-brushes; 112 a-a first connection terminal;

12-fixing piece; 121-a conductive ring; 121 a-connecting ears;

122-conductive elements; 122 a-a second connection terminal; 123-insulating sleeve; 1231-a first shaft section; 1232-a second shaft section; 125-nut;

124-a support base; 124 a-a fixed shaft; 124 b-a flange; 124 c-a first flange; 124 d-annular flange; h-positioning holes;

13-a first bearing; 14-a second bearing.

Detailed Description

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order not to unnecessarily obscure the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the invention. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

In the process of generating electricity, the blades of the wind generating set need to be arranged facing the wind, and when the wind direction changes, the engine room needs to rotate along with the change of the wind direction. This causes that the cables arranged in the wind power plant for transmitting electrical energy or signals will also create a twisting problem with the rotation of the nacelle.

In order to increase the wind capturing capacity of the blades, the blades are always located on the windward side, and a yaw system is usually arranged in the nacelle to drive the nacelle to rotate relative to the tower. The nacelle is rotatably connected to the top end of the tower through a yaw bearing, and a cable on one side of the generator moving randomly is required to be connected with a cable fixedly laid in the tower so as to transmit electric energy to a power grid through an electric switching device such as a converter. When the cabin yaw rotates, the cables of the generator can be driven to rotate, so that the cable twisting problems such as collision, abrasion and winding among a plurality of cables or between the cables and surrounding platforms are easy to occur, the service life of the cables is influenced, and even the wind power generator set is caused to be faulty.

In order to solve the problem of cable twisting, the embodiment of the invention provides a rotary conductive device and a wind generating set.

Referring to fig. 1, an embodiment of the present invention provides a wind power plant comprising a nacelle 2, a tower 3, a generator 4 and a rotating electrical machine 1.

A second cable L2 is fixedly laid in the tower 3.

The nacelle 2 is arranged on top of the tower 3, the nacelle 2 being rotatable with respect to the tower 3.

The generator 4 is arranged on the side of the nacelle 2, for example inside or outside the nacelle 2, the generator 4 having a first cable L1 leading out from the nacelle 2.

The rotary conductive device 1 movably and electrically connects the first cable L1 and the second cable L2.

In order to better understand the present invention, a specific structure of a rotary electric conduction device 1 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 2, the rotary electric conduction device 1 provided in the embodiment of the invention includes a rotating member 11 and a fixing member 12.

The fixing member 12 includes a conductive ring 121 and a conductive member 122 disposed on the conductive ring 121, and the conductive member 122 is electrically connected to the second cable L2 fixed externally. In this embodiment, the fixing member 12 may be mounted on the platform in the tower 3 by fasteners such as bolts so that the second cable L2 is in a relatively stationary state with respect to the fixing member 12.

The rotating member 11 is disposed coaxially with the fixed member 12 and rotatable relative to the fixed member 12, the rotating member 11 includes a housing 111 and a brush 112 disposed on the housing 111, the brush 112 is for electrically connecting with a first cable L1 that rotates in synchronization with the outside, and the brush 112 is in sliding contact with the conductive ring 121 to form a conductive path that electrically connects the first cable L1 with a second cable L2.

In this embodiment, the rotating member 11 may be coaxially and fixedly connected to the rotation center of the nacelle 2 through a shift fork, or may be fixedly connected to the nacelle 2 through another driving mechanism, so as to drive the rotating member 11 to rotate synchronously around its own axis. The first cable L1 of the generator 4 on the nacelle 2 side is connected to the brushes 112 of the rotor 11 such that the first cable L1 is in a relatively stationary state with respect to either the nacelle 2 or the rotor 11.

Therefore, when the nacelle 2 changes in wind direction and yaw rotates relative to the tower 3, the rotating member 11 of the rotary conductive device 1 rotates synchronously with the rotation of the nacelle 2, the first cable L1 led out from the generator 4 at one side of the nacelle 2 is electrically connected with the rotating member 11 and rotates synchronously with the rotating member 11, the fixing member 12 of the rotary conductive device 1 is connected with the second cable L2 fixedly laid in the tower 3, so that the first cable L1 and the second cable L2 can be movably and electrically connected without twisting the cable, the technical characteristic requirements of the cable such as high torsion resistance and high wear resistance are reduced, the manufacturing cost of the cable is further reduced, and the reliability of power transmission is improved.

According to the rotary conductive device 1 provided by the embodiment of the invention, the electric brush 112 is arranged on the rotating member 11, the conductive ring 121 in sliding contact with the electric brush 112 and the conductive member 122 connected with the conductive ring 121 are arranged on the fixed member 12, the electric brush 112 is connected with the first cable L1 which rotates synchronously, and the conductive member 122 is connected with the second cable L2 which is fixed, so that a conductive channel capable of being movably connected can be formed between the cables which move relatively, the problems of collision, abrasion, winding and the like between the cables or between the cables and surrounding platforms are avoided, and the reliability of power transmission is improved. In addition, the cable does not need to be disconnected, the length allowance is not needed to be reserved for the cable, the use cost of the cable is reduced, and the workload of later maintenance is also reduced.

Referring to fig. 3, in the rotary conductive device 1 provided in the embodiment of the invention, the brush 112 of the rotating member 11 is embedded in the wall portion of the housing 111 and is connected with the housing 111 in an insulating manner, a first connection terminal 112a electrically connected with the first cable L1 is disposed at a side of the brush 112 away from the conductive ring 121, and a side of the brush 112 facing the conductive ring 121 is in sliding contact with the conductive ring 121.

Alternatively, the housing 111 includes an annular bearing portion 111a and a cover plate 111b provided at one end of the annular bearing portion 111a, and the brush 112 is embedded in a wall portion of the annular bearing portion 111 a.

The brush 112 includes a housing and brush material disposed within the housing. Optionally, the brush material is pure carbon graphite, or may be a sintered body of metal material such as carbon and copper, and has excellent wear resistance while conducting electricity, so as to reduce wear when the brush 112 is in sliding contact with the conducting ring 121 as much as possible, and improve the service life of the brush 112. Alternatively, the brush 112 may be fixed to the wall portion of the annular bearing portion 111a by a fastener or an epoxy resin glue resistant to high temperature.

Since the cables of the wind power generator are generally heavy, the material of the housing 111 may be a metal member in order to improve the bearing capacity of the housing 111. To prevent the brush 112 from electrically conducting with the housing 111, the case of the brush 112 may be subjected to an insulating treatment, such as coating an insulating paste or paint on the outer surface of the case that contacts the housing 111.

In some embodiments, the housing 111 is sleeved on the outer peripheral side of the conductive ring 121, and the conductive member 122 is disposed on the inner peripheral side of the conductive ring 121, as shown in fig. 2. The brush 112 is fitted into a wall portion of the housing 111, a part of the brush 112 is located on an outer peripheral side of the housing 111 and is electrically connected to the first cable L1 through the connection terminal 112a, and another part of the brush 112 is located on an inner peripheral side of the housing 111 and is in sliding contact with the conductive ring 121. The conductive member 122 is disposed on the inner peripheral side of the conductive ring 121 and is electrically connected to the second cable L2, thereby electrically connecting the first cable L1 and the second cable L2.

In some embodiments, the conductive ring 121 is sleeved on the outer peripheral side of the housing 111, and the conductive member 122 is disposed on the outer peripheral side of the conductive ring 121. Specifically, the brush 112 is fitted into a wall portion of the housing 111, a part of the brush 112 is located on the inner peripheral side of the housing 111 and is electrically connected to the first cable L1 via the connection terminal 112a, and another part of the brush 112 is located on the outer peripheral side of the housing 111 and is in sliding contact with the conductive ring 121. The conductive member 122 is disposed on the outer peripheral side of the conductive ring 121 and is electrically connected to the second cable L2, thereby electrically connecting the first cable L1 and the second cable L2.

For convenience of description, the embodiment of the present invention will be described taking as an example the rotary electric conduction device 1 shown in fig. 2 in which the housing 111 of the rotary member 11 is fitted around the outer peripheral side of the conductive ring 121 of the fixed member 12, and the conductive member 122 is disposed on the inner peripheral side of the conductive ring 121.

Referring to fig. 4 and 5, the conductive ring 121 is provided with a connecting ear 121a, the conductive member 122 is a rod-shaped member, one end of the conductive member is connected to the connecting ear 121a, and the other end of the conductive member is provided with a second connection terminal 122a electrically connected to the second cable L2. The conductive ring 121 may be manufactured by a casting process, and the cross section of the conductive member 122 may be circular, square, etc., and the material may be a conductive metal member such as copper, etc.

As shown in fig. 5, the fixing member 12 further includes a supporting seat 124, where the supporting seat 124 includes a fixing shaft 124a and a flange 124b disposed at one end of the fixing shaft 124a, the fixing shaft 124a is coaxially disposed with the housing 111, and the conductive ring 121 is connected to the flange 124b through the conductive member 122 to define axial movement of the conductive ring 121 along the fixing member 12.

Further, the conductive member 122 is connected to the flange 124b in an insulating manner.

Specifically, as shown in fig. 6, an insulating sleeve 123 is sleeved on the outer periphery side of the conductive member 122, the insulating sleeve 123 includes a first shaft section 1231 and a second shaft section 1232, wherein the first shaft section 1231 is close to the conductive ring 121, the second shaft section 1232 is close to the flange 124b, a step surface is formed between the outer diameter dimension of the first shaft section 1231 and the outer diameter dimension of the second shaft section 1232, a positioning hole H is formed on the flange 124b, and the second shaft section 1232 passes through the positioning hole H and is in threaded connection with the nut 125, so that the insulating sleeve 123 and the conductive member 122 are fixed to the flange 124b.

Optionally, the insulating sleeve 123 is made of high temperature resistant plastic such as nylon, the insulating sleeve 123 is in interference fit with the conductive member 122, and the insulating sleeve 123 is fixedly connected with the flange 124b, so that the axial movement of the conductive ring 121 and the conductive member 122 along the fixing member 12 is limited, and the brush 112 and the conductive ring 121 are ensured to be in sliding contact all the time in the rotating process, so that a conductive channel capable of being movably connected is formed.

Further, as shown in fig. 2, a first bearing 13 and a second bearing 14 are provided between both axial ends of the fixed shaft 124a and the housing 111, respectively, so that the rotary member 11 is rotatable with respect to the fixed member 12.

Specifically, as shown in fig. 3 to 5, a clamping portion 111c is provided on a side of the cover plate 111b of the housing 111 facing the fixed shaft 124a, a first flange 124c extending radially outward is provided on an end of the fixed shaft 124a away from the flange 124b, and the first bearing 13 is disposed between the clamping portion 111c and the first flange 124 c.

The flange 124b of the fixed shaft 124a is provided with an annular flange 124d, and an end of the annular bearing portion 111a of the housing 111 remote from the cover plate 111b is provided with a second flange 111d extending radially inward, and the second bearing 14 is disposed between the second flange 111d and the annular flange 124 d.

In addition, since there are 20 or more first cables L1 of the generator 4 on the nacelle 2 side, when the current of the first cable L1 is transmitted to the rotating conduction device 1, if the current is concentrated, the heat generation of the rotating conduction device 1 may be excessive, and in severe cases, a fault such as a cable short circuit may be caused, so that the current needs to be split.

Referring to fig. 3 and fig. 7 together, in the rotating member 11 of the rotary conductive device 1 according to the embodiment of the invention, the number of the brushes 112 is plural, and the brushes 112 are arranged in rows and columns in the circumferential direction and the axial direction of the housing 111. The number of the conductive rings 121 is plural, and the plural conductive rings 121 are arranged at intervals along the axial direction of the fixing member 12. In the axial direction, the plurality of conductive rings 121 are in one-to-one correspondence with the plurality of rows of brushes 112 and are in sliding contact with each other, respectively, to form a plurality of conductive channels connected in parallel to each other. Optionally, two adjacent conductive rings 121 are spaced apart from each other by an insulating material and are connected in an insulating manner.

Thus, the first cable L1 of the generator 4 led out from the nacelle 2 side converges current to the plurality of conductive rings 121 through the plurality of rows of brushes 112, and the converged current is split and transmitted to the second cable L2 by the conductive member 122 on each conductive ring 121.

In some embodiments, each conductive ring 121 is provided with at least two conductive members 122 spaced apart in a circumferential direction thereof, and the plurality of conductive members 122 of the plurality of conductive rings 121 are disposed offset from each other in the circumferential direction of the fixing member 12. Meanwhile, the flange 124b is provided with a plurality of positioning holes H distributed at intervals along the circumferential direction, the plurality of conductive members 122 are in one-to-one correspondence with the plurality of positioning holes H, and an insulating sleeve 123 is sleeved on the outer peripheral side of each conductive member 122 to fix the plurality of conductive members 122 and the respective insulating sleeves 123 to the flange 124b, respectively, as shown in fig. 5.

At least two conductive members 122 on each conductive ring 121 and a corresponding row of brushes 112, namely a circle of brushes 112, form a conductive channel, so that current transmitted to the circle of brushes 112 is distributed to the plurality of conductive members 122, and excessive heating of the rotary conductive device 1 caused by current aggregation is avoided.

Alternatively, at least two conductive members 122 are uniformly distributed in the circumferential direction of each conductive ring 121, and the conductive members 122 of the plurality of conductive rings 121 are disposed offset from each other in the circumferential direction of the fixing member 12, so that adjacent conductive members 122 are prevented from conducting with each other.

Since the plurality of conductive members 122 are uniformly distributed in the circumferential direction of the fixing member 12, the current equalizing level of the current is improved, and the failure of one or more brushes 112 caused by the excessively high local temperature rise of the rotary conductive device 1 is avoided, thereby affecting the service life of the whole rotary conductive device 1.

It can be understood that the brush 112 is used as the minimum unit for power transmission of the rotating member 11, the conductive member 122 is used as the minimum unit for power transmission of the fixed member 12, and the number and arrangement of the brush 112 and the conductive member 122 can be designed according to the requirements in practical use, so as to adapt to the specification of the cable and the requirement of the power transmission capability of the cable.

It should be noted that, although the above description is made taking the rotary conductive device 1 shown in fig. 2 as an example, that is, "the housing 111 of the rotating member 11 is sleeved on the outer peripheral side of the conductive ring 121 of the fixed member 12 and the conductive member 122 is disposed on the inner peripheral side of the conductive ring 121" for convenience of description, it should be understood that the rotary conductive device 1 according to the exemplary embodiment of the present invention is equally applicable to the structure that "the conductive ring 121 of the fixed member 12 is sleeved on the outer peripheral side of the housing 111 of the rotating member 11 and the conductive member 122 is disposed on the outer peripheral side of the conductive ring 121".

Therefore, in the rotary conductive device 1 provided by the embodiment of the invention, through respectively optimizing the design of the brush 112 of the rotating member 11, the conductive ring 121 of the fixing member 12 and the conductive member 122, the current of the first cable L1 can be electrically connected with the second cable L2 only through primary confluence and shunt in the electrical principle, the uniformity and consistency of current distribution are ensured, and the temperature rise in the sliding contact process of the brush 112 and the conductive ring 121 can be effectively controlled, so that the overall reliability of the rotary conductive device 1 is improved. In addition, the current flowing in the rotating conduction device 1 of the first cable L1 is largely the same as the current flowing in the cable, so that the distance that the current flows in the rotating conduction device 1 is effectively shortened, and the electric energy loss generated in the rotating conduction device 1 is reduced.

The generator 4 of the wind turbine generator system as described above is configured such that the first cable L1 led out from the nacelle 2 side is electrically connected to the second cable L2 fixedly laid in the tower 3 by the rotary electric conduction device 1. Specifically, the rotor 11 of the rotary conduction device 1 is connected to the nacelle 2, the stator 12 of the rotary conduction device 1 is connected to the tower 3, and the brushes 112 of the rotor 11 are in sliding contact with the conductive rings 121 of the stator 12 to form a conductive path electrically connecting the first cable L1 and the second cable L2. The first cable L1 is electrically connected to the brush 112, and the second cable L2 is electrically connected to a conductive member 122 provided on the conductive ring 121.

The specific connection of the cables of the generator 4 to the various components of the rotary conduction device 1 will be described in detail below with reference to fig. 8.

The generator 4 comprises 3n phase winding units, each phase winding unit comprising m cables, i.e. the first cable L1 comprises 3n x m cables. The rotary conductive device 1 comprises 3n conductive rings 121 arranged at intervals along the axial direction of the fixed member 12 and brushes 112 distributed in 3n rows and m columns along the circumferential direction and the axial direction of the rotating member 11, each conductive ring 121 is provided with p conductive members 122 distributed at intervals along the circumferential direction of the rotary conductive device, and each row of brushes 112, each conductive ring 121 and the corresponding p conductive members 122 form a conductive channel, which is 3n conductive channels in total. The second cable led out from the conductive member 122 of the rotary conductive device 1 includes 3n×p cables, where n, m, p are positive integers. m and p may be equal or unequal.

When the generator comprises a 6-phase winding unit, the rotary conduction device 1 comprises 6 conducting rings 121 and 6 rows of brushes 112, each conducting ring 121 comprising for example 3 conducting members 122 to form 6 conducting channels, as shown in fig. 2, 3 and 7.

Taking the example of a generator comprising three phase winding units, fig. 8 shows an electrical schematic of one of the phase winding units. Assume that the three-phase winding units are a U-phase, a V-phase and a W-phase, respectively, and each phase winding unit includes 3 cables. U11 represents a first cable of the U-phase winding unit, U12 represents a second cable of the U-phase winding unit, and U13 represents a third cable of the U-phase winding unit. Each cable is correspondingly connected with 4 electric brushes 112, wherein a U11 cable is connected with R1-R4 electric brushes, a U12 cable is connected with R5-R8 electric brushes, and a U13 cable is connected with R9-R12 electric brushes. Wherein R represents the superimposed resistance value of the electric resistance of the brush 112 and the contact resistance of the brush 112 in sliding contact with the conductive ring 121.

Accordingly, the rotor 11 of the rotary conduction device 1 is provided with 12 brushes corresponding to each phase winding unit, and the first cable L1 of the generator 4 includes 9 cables in total, and is electrically connected to 36 brushes 112, respectively. The 36 brushes 112 are arranged in 3 rows and 12 columns along the circumferential direction and the axial direction of the housing 111 of the rotating member 11, and the fixed member 12 is correspondingly provided with 3 conductive rings 121 distributed at intervals along the axial direction thereof. Three cables U11, U12 and U13 of a U-phase winding unit of the generator 4 are respectively and electrically connected with 12 electric brushes 112 of a first row, three cables of a V-phase winding unit are respectively and electrically connected with 12 electric brushes of a second row, three cables of a W-phase winding unit are respectively and electrically connected with 12 electric brushes of a third row, and the electric brushes 112 of each row are in sliding contact with a corresponding conductive ring 121 to form 3 conductive channels. The current is then led out to the second cables L2 by the conductive members 122 provided on each conductive ring 121, respectively, and transmitted to the electrical switching apparatus such as the current transformer in the tower 3.

Assuming that 4 conductive pieces 122 are uniformly arranged in the circumferential direction in each of the 3 conductive rings 121 of the fixing member 12, the 12 conductive pieces 122 of the 4 conductive rings 121 are disposed offset from each other in the circumferential direction of the fixing member 12. Each conductive member 122 is electrically connected to the second cable L2 through the second connection terminal 122a. Therefore, after the first cable L1 of the generator 4 is connected with 36 electric brushes 112 through 9 cables, current is converged to 3 conductive channels, and the current of the 3 conductive channels is averagely split to the second cable L2 through 12 conductive pieces 122 which are staggered mutually, so that current is prevented from being gathered on the rotary conductive device 1, the heating value of the rotary conductive device 1 is reduced, and the reliability of power transmission is improved. The number of the cables of the first cable L1 and the number of the cables of the second cable L2 may be equal or unequal, which is not limited herein.

The wind generating set provided by the embodiment of the invention adopts the rotary conductive device 1, so that the cable twisting problem is solved, the current converging frequency of a main circuit is reduced in the electrical principle, the uniformity of the current flowing through the rotary conductive device 1 is improved, the temperature rise of the brush 112 in sliding contact with the conductive ring 121 can be effectively controlled, the overall reliability of the rotary conductive device 1 is further improved, and the failure rate of the wind generating set is reduced.

In addition, the rotary electric conduction device 1 according to the above-described exemplary embodiment may also be applied to any of various electric devices including mechanical rotational connection and electric signal transmission, such as, but not limited to, a wind turbine generator set, and will not be described again.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A rotary electric conduction device (1), characterized by comprising:

the fixing piece (12) comprises a conductive ring (121) and a conductive piece (122) arranged on the conductive ring (121), wherein the conductive piece (122) is used for being electrically connected with a second cable (L2) fixed outside;

a rotating member (11) coaxially disposed with the fixing member (12) and rotatable relative to the fixing member (12), the rotating member (11) including a housing (111) and a brush (112) disposed on the housing (111), the brush (112) being for electrical connection with a first cable (L1) that rotates in synchronization with the outside, and the brush (112) being in sliding contact with the conductive ring (121) to form a conductive path that electrically connects the first cable (L1) with the second cable (L2);

the brush (112) is embedded in a wall portion of the housing (111) and is connected with the housing (111) in an insulating manner;

the number of the electric brushes (112) is a plurality, and the electric brushes (112) are arranged in rows and columns in the circumferential direction and the axial direction of the shell (111);

the number of the conductive rings (121) is a plurality, and the plurality of the conductive rings (121) are arranged at intervals along the axial direction of the fixing piece (12);

each conducting ring (121) is provided with at least two conducting pieces (122) which are distributed at intervals along the circumferential direction of the conducting ring, and the conducting pieces (122) of the conducting rings (121) are mutually staggered along the circumferential direction of the fixing piece (12);

the shell (111) is sleeved on the outer periphery side of the conductive ring (121), and the conductive piece (122) is arranged on the inner periphery side of the conductive ring (121); or, the conductive ring (121) is sleeved on the outer peripheral side of the shell (111), and the conductive piece (122) is arranged on the outer peripheral side of the conductive ring (121).

2. The rotary electric conduction device (1) according to claim 1, characterized in that a side of the brush (112) facing away from the conductive ring (121) is provided with a first connection terminal (112 a) electrically connected to the first cable (L1), and that a side of the brush (112) facing the conductive ring (121) is in sliding contact with the conductive ring (121).

3. The rotary electric conduction device (1) according to claim 1, wherein the conductive ring (121) is provided with a connection lug (121 a), the conductive member (122) is a rod-shaped member, one end of which is connected with the connection lug (121 a), and the other end of which is provided with a second connection terminal (122 a) electrically connected with the second cable (L2).

4. The rotary electric conduction device (1) according to claim 1, characterized in that a plurality of the conductive rings (121) are in one-to-one correspondence with and in sliding contact with a plurality of rows of the brushes (112), respectively, in the axial direction.

5. The rotary electric device (1) according to any one of claims 1 to 4, wherein the fixing member (12) further comprises a supporting seat (124), the supporting seat (124) comprises a fixed shaft (124 a) and a flange plate (124 b) disposed at one end of the fixed shaft (124 a), the fixed shaft (124 a) is coaxially disposed with the housing (111), and the conductive ring (121) is connected with the flange plate (124 b) through the conductive member (122) so as to limit the axial movement of the conductive ring (121) along the fixing member (12).

6. The rotary electric conduction device (1) according to claim 5, characterized in that the electric conduction member (122) is connected with the flange plate (124 b) in an insulating manner.

7. The rotary electric device (1) according to claim 5, characterized in that a first bearing (13) and a second bearing (14) are respectively provided between the two axial ends of the fixed shaft (124 a) and the housing (111).

8. A wind turbine generator set, comprising:

a tower (3), wherein a second cable (L2) is fixedly laid in the tower (3);

-a nacelle (2) arranged at the top end of the tower (3), the nacelle (2) being rotatable with respect to the tower (3);

a generator (4) provided on one side of the nacelle (2), the generator (4) having a first cable (L1) led out from the nacelle (2);

the rotary electric device (1) according to any one of claims 1 to 7, a rotor (11) of the rotary electric device (1) being connected to the nacelle (2), a stator (12) of the rotary electric device (1) being connected to the tower (3), the first cable (L1) being electrically and movably connected to the second cable (L2) through the rotary electric device (1).

9. Wind power generator set according to claim 8, characterized in that the generator (4) comprises 3 n-phase winding units, the first cable (L1) comprises 3n×m cables, the rotary conductive device (1) comprises 3n conductive rings (121) arranged at intervals along the axial direction of the fixed part (12) and brushes (112) distributed in 3n rows and m columns along the circumferential direction and the axial direction of the rotating part (11), each conductive ring (121) is provided with p conductive parts (122) distributed at intervals along the circumferential direction of the conductive ring, each row of brushes (112), each conductive ring (121) and the corresponding p conductive parts (122) form one conductive channel, and the second cable (L2) comprises 3n×p cables, wherein n, m, p are positive integers.