A yaw collector ring stator structure

Abstract

The present invention discloses a yaw collector ring annular stator structure, comprising a first mounting plate and a second mounting plate arranged opposite to each other; a plurality of insulating pull rods for connecting the first and second mounting plates; a plurality of annular plate assemblies placed between the first mounting plate and the second mounting plate, the plurality of annular plate assemblies being mounted on the insulating pull rods, a first insulator being arranged between the first mounting plate and its adjacent annular plate assembly, a second insulator being arranged between two adjacent annular plate assemblies, and a third insulator being arranged between the second mounting plate and its adjacent annular plate assembly; the annular plate assembly comprising an annular plate, a brush assembly, a bracket and a bus bar, a plurality of brush assemblies being mounted on the annular plate that can contact with a rotor slip ring, the bus bar being mounted on the annular plate through the bracket and connected to the brush assembly. The collector ring stator structure has a simple structure, is easy to install and maintain, can meet the transmission of large currents, and has a small resistance between the stator and the rotor, thereby reducing power consumption.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a yaw collector ring annular stator structure. Background Art

[0002] With the continuous development of wind power generation systems in my country, the wind power industry has higher requirements for the reliability and power generation efficiency of wind turbines. In order to solve the problem of serious twisting and wear of power cables caused by yaw of the cabin, yaw collector rings have gradually become popular among users. Like traditional collector rings, yaw collector rings mainly include stator and rotor structures, and the stator is arranged with brush assemblies. The more brushes of the same specification are arranged, the stronger the current conduction capacity. As the power of wind turbines increases, the transmitted current becomes higher and higher, so it is necessary to invent a collector ring stator structure that can meet the requirements of large currents. Summary of the invention

[0003] The present invention proposes a yaw collector ring annular stator structure to solve the problem that the existing collector rings cannot meet the requirement of large current transmission.

[0004] The technical means adopted by the present invention are as follows:

[0005] A yaw collector ring annular stator structure, comprising: a first mounting plate and a second mounting plate arranged opposite to each other; a plurality of insulating pull rods for connecting the first mounting plate and the second mounting plate; a plurality of annular plate assemblies placed between the first mounting plate and the second mounting plate, the plurality of annular plate assemblies being mounted on the insulating pull rods, a first insulator being provided between the first mounting plate and the adjacent annular plate assemblies, a second insulator being provided between two adjacent annular plate assemblies, and a third insulator being provided between the second mounting plate and the adjacent annular plate assemblies; the annular plate assembly comprising an annular plate, a brush assembly, a bracket and a bus, a plurality of the brush assemblies which can contact with a rotor slip ring are mounted on the annular plate, the bus being mounted on the annular plate via the bracket and connected to the brush assembly.

[0006] Furthermore, the brush assembly includes a brush box, a brush body, a compression spring, a compression spring pressure plate and a brush braid; the brush box is installed on the annular plate, a brush body installation cavity is provided in the brush box, one end of the brush body is provided with a slip ring contact surface that can contact the rotor slip ring, and the other end is fixedly connected to the brush braid, the brush body is placed in the brush body installation cavity and the end provided with the slip ring contact surface faces the center of the annular plate, the end of the brush body to which the brush braid is fixed is provided with the compression spring, and the compression spring pressure plate is fixed on the brush box so that one end of the compression spring abuts against the brush body, and the other end abuts against the compression spring pressure plate.

[0007] Furthermore, the annular plate is provided with a radially arranged positioning groove, the brush box is provided with a positioning protrusion that can cooperate with the positioning groove, and when the brush box is installed on the annular plate, the positioning protrusion is placed in the positioning groove.

[0008] Furthermore, one end of the brush body provided with the slip ring contact surface is also provided with a first heat dissipation groove.

[0009] Furthermore, a heat dissipation channel is provided on the inner side wall of the brush body and the brush body installation cavity.

[0010] Furthermore, a second heat dissipation slot is provided on the brush box.

[0011] Furthermore, a temperature sensor installation groove is provided on the upper inner wall of the brush body installation cavity.

[0012] Furthermore, the annular plate is provided with a plurality of heat dissipation holes.

[0013] Furthermore, the first insulator, the second insulator and the third insulator are sleeved on the insulating pull rod.

[0014] Compared with the prior art, the yaw collector ring annular stator structure described in the present invention is provided with an annular plate assembly, and each annular plate assembly can be installed with multiple brush assemblies in the circumferential direction. The brush assemblies are connected to the bus bar, so as to realize the transmission of large current to meet the current transmission of the wind turbine set. At the same time, it has a compact structure and is easy to maintain. Insulators are used to position the multiple annular plates, and the insulating pull rods are insulated by bonding insulating sleeves to ensure the insulation performance between the annular plates. At the same time, since multiple groups of brushes are in contact with the rotor slip ring at the same time, the current passing through a single brush assembly is reduced, thereby reducing the heat generated by its operation and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the annular stator structure of the yaw collector ring according to Embodiment 1 of the present invention;

[0016] Figure 2 is a structural diagram of the annular plate assembly;

[0017] Figure 3 is a structural diagram of the brush assembly;

[0018] Figure 4 This is a structural diagram of the disassembled brush assembly;

[0019] Figure 5 This is the structural diagram of the brush box;

[0020] Figure 6 A structural diagram showing the brush body and brush braid assembled together;

[0021] Figure 7 The assembly drawing of the brush body and the brush box;

[0022] Figure 8 for Figure 7 Axis view of

[0023] Fig. 9 This is the structural diagram of the ring plate.

[0024] In the figure: 10, first mounting plate, 11, second mounting plate, 12, insulating pull rod, 13, first insulator, 14, second insulator, 15, third insulator, 2, annular plate assembly, 20, annular plate, 200, positioning groove, 201, heat dissipation hole, 22, bracket, 23, bus, 230, output terminal of bus, 3, brush assembly, 30, brush box, 300, brush body mounting cavity, 301, positioning protrusion, 302, second heat dissipation groove, 303, temperature sensor mounting groove, 304, fixing ear, 305, threaded hole, 31, brush body, 310, slip ring contact surface, 311, groove, 32, compression spring, 33, compression spring pressure plate, 330, cylindrical protrusion, 34, brush braid, 35, bolt. DETAILED DESCRIPTION

[0025] like Figure 1 and Figure 2 The figure shows a yaw collector ring annular stator structure disclosed in the present invention, including a first mounting plate 10 and a second mounting plate 11 arranged opposite to each other; a plurality of insulating rods 12 are arranged between the first mounting plate 10 and the second mounting plate 11, and the number of insulating rods 12 in the figure is 3, and threads are provided at both ends of the insulating rods 12, insulating sleeves are bonded to the insulating rods 12, and the two ends of the insulating rods 12 can be fixedly connected to the mounting plates at both ends through nuts.

[0026] A plurality of annular plate assemblies 2 are installed between the first mounting plate 10 and the second mounting plate 11, specifically, as Figure 2As shown, the annular plate assembly 2 includes an annular plate 20, a brush assembly 3, a bracket 22 and a busbar 23. The annular plate 20 is provided with a plurality of mounting holes 202 having the same number as the insulating rod 12. The insulating rod 12 passes through the mounting holes 202. The insulating rod 12 is sleeved with an insulator for separation. Specifically, a first insulator 13 is provided between the first mounting plate 10 and the adjacent annular plate 20, a second insulator 14 is provided between two adjacent annular plates 20, and a third insulator 15 is provided between the second mounting plate 11 and the adjacent annular plate 20. The first, second and third insulators have the same structure. The insulator is made of insulating material. A through hole is provided in the center of the insulator for the insulating rod to pass through. Stops are provided at both ends of the insulator for matching with the mounting holes 202 on the annular plate 20. The insulator is sleeved on the insulating rod and matches with the mounting holes on the annular plate through the stoppers at both ends to arrange multiple annular plate assemblies between the first mounting plate and the second mounting plate at intervals.

[0027] A plurality of brush assemblies 3 that can contact the rotor slip ring are installed on the annular plate 20. In the figure, 12 brush assemblies are arranged on one annular plate. The bus 23 is installed on the outer side of the annular plate 20 through the bracket 22, and the bus 23 is on and connected to the brush assembly 3.

[0028] like Figure 3 , Figure 4 As shown, the brush assembly 3 includes a brush box 30, a brush body 31, a compression spring 32, a compression spring pressure plate 33 and a brush braid 34; the brush box 30 is mounted on the annular plate 20. In this embodiment, as shown in FIG. Figure 5 As shown, the brush box 30 has two fixing ears 304 on both sides, and the brush box 30 is fixed to the annular plate 20 by bolts. The brush box 30 is provided with a brush body installation cavity 300, as shown in FIG. Figure 6As shown, one end of the brush body 31 is an arc-shaped slip ring contact surface 310 that can contact the rotor slip ring, and the other end is fixedly connected to the brush braid 34. In this embodiment, the brush braid 34 is flat and riveted to the brush body 31. The brush body 31 is placed in the brush body installation cavity 300 and one end of the brush body 31 provided with the slip ring contact surface 310 faces the center of the annular plate 20, so that the slip ring contact surface 310 contacts the rotor slip ring placed in the annular plate 20. The end of the brush body 31 fixed with the brush braid 34 is provided with the compression spring 32. The end of the brush box 30 close to the brush braid 34 has a threaded hole 305. Both ends of the compression spring pressure plate 33 are fixed to the brush body 300 by bolts 35. The brush box 30 is close to one end of the brush braid 34, so that one end of the compression spring 32 abuts against the brush body 31, and the other end abuts against the compression spring pressure plate 33. In the present embodiment, a groove 311 is provided on the brush body 31, and a cylindrical protrusion 330 is provided on the compression spring pressure plate 33. One end of the compression spring 32 is placed in the groove 311, and the other end is sleeved on the cylindrical protrusion 330. The compression spring 32 can push the brush body 31 so that the contact surface of the slip ring is in close contact with the rotor slip ring to reduce the resistance between the brush body and the rotor slip ring. The compression spring pressure plate in the present invention adopts nylon PA66 insulating material, the compression spring is a cylindrical spiral spring, and the brush box material adopts cast aluminum material. One end of the bracket 22 is fixed to one side surface of the annular plate 20 by bolts, and the other end of the bracket 22 extends from the outer edge of the annular plate. The bus 23 is an arc-shaped structure. The bus 23 is fixed to the outer end of the bracket 22 by bolts, so that the bus 23 is arranged along the outer circumference of the annular plate 20. Preferably, a gap is formed between the bus and the annular plate to facilitate ventilation and heat dissipation. The other end of the brush braid 34 is fixed to the bus 23 by bolts. The output terminal 230 of the bus is connected to the output busbar of the collector ring junction box. The current on the rotor slip ring can be transmitted to the collector ring junction box through the brush body, the brush braid and the bus. In the figure, the bus has two groups, that is, each annular plate assembly has two groups of power transmission paths connected by the bus, which further reduces the current on each bus and the power consumption generated. The collector ring stator structure disclosed in the present invention is provided with an annular plate, and multiple brush assemblies can be arranged on the annular plate at the same time, thereby enhancing the ability to transmit current. At the same time, since multiple brush assemblies transmit current, compared with existing collector rings, when transmitting the same amount of power, the current flowing through each brush assembly is reduced, thereby reducing the power consumption generated by each brush assembly and reducing heat generation.

[0029] The brush assembly disclosed in the present invention has the following advantages over the existing brush assembly: the existing brush assembly generally includes a brush box, a brush and a spring, and the current brush assembly is mainly designed based on the collector ring rotating at high speed, so the existing brush assembly is designed based on the following application experience: the brush and the conductive slip ring will produce a layer of oxide film during use, and when the slip ring rotates at high speed, the oxide film can be kept within a stable range, thereby effectively controlling the contact resistance between the slip ring and the brush. The spring force needs to be controlled within an appropriate range. A small spring force will increase the contact resistance between the brush and the conductive slip ring, thereby increasing the temperature rise; a large spring force will cause serious wear of the brush, so the spring generally adopts a constant pressure coil spring.

[0030] The stator structure of the present invention is mainly used for the yaw collector ring rotating at a low speed. Since the rotation speed of the rotor of the yaw collector ring is synchronized with the rotation speed of the cabin, the rotation speed of the cabin is very low (about 0.1r / min). Compared with the brush conductive structure of the collector ring rotating at a high speed, the brush conductive structure is difficult to control the oxide film between the brush and the slip ring within a stable range through the friction of the high-speed rotating ring surface due to the low rotation speed, resulting in a gradual increase in the contact resistance between the brush and the slip ring. Increasing the elastic force of the spring is an effective means to control the contact resistance between the brush and the slip ring, while the traditional constant pressure coil spring has limitations. If you want to increase its elastic force, you need to increase its installation space. In the present invention, the brush assembly includes a brush box, a brush body, a compression spring, a compression spring pressure plate and a brush braid. The use of a compression spring can provide a larger elastic force without increasing the volume of the brush assembly, so that the brush body can be in close contact with the rotor slip ring, ensuring that the resistance between the brush body and the rotor slip ring is small (poor contact between the brush body and the rotor slip ring will cause an increase in resistance), thereby reducing power consumption and reducing heat generation. At the same time, the brush assembly of this structure also has the advantages of easy maintenance and replacement. Specifically, when a brush assembly needs maintenance or needs to be replaced due to wear, it is only necessary to disassemble the compression spring pressure plate of the corresponding brush assembly, that is, the brush body can be removed for maintenance or replacement of the brush body, without the need to disassemble the entire brush assembly for replacement, thus saving maintenance costs. At the same time, the structure is simple and easy to process and install.

[0031] The assembly process of the yaw collector ring annular stator structure disclosed in the present invention is as follows: multiple third insulators are installed in the groove of the second mounting plate (the mounting plate on the lower side), that is, the convex stop of the third insulator is inserted into the concave stop of the second mounting plate, and then the multiple mounting holes on the annular plate in the lowermost annular plate assembly are aligned with the third insulators, and the annular plate assembly and the third insulator are installed through the mounting holes and the stoppers at the upper ends of the third insulators, and then multiple insulating rods are inserted into the mounting holes of the annular plate assembly and the third insulators and pass through the second mounting plate, and the lower ends of the insulating rods are fixed to the second mounting plate with nuts, and then the second insulators are sleeved onto the multiple insulating rods and installed in the mounting holes of the annular plate assembly on the lower side, and then another annular plate assembly is sleeved into the insulating rod and aligned and installed with the second insulator, in this way, multiple groups of second insulators and annular plate assemblies are sleeved on the insulating rods, and then multiple first insulators are sleeved on the insulating rods and the first mounting plate is sleeved on the multiple insulating rods, and the multiple insulating rods are fixed to the upper mounting plate with nuts.

[0032] Furthermore, if Fig. 9 As shown, the annular plate 20 is provided with a radially arranged positioning groove 200, and the brush box 30 is provided with a positioning protrusion 301 that can cooperate with the positioning groove 200. When the brush box 30 is installed on the annular plate 20, the positioning protrusion 301 is placed in the positioning groove 200. Specifically, a plurality of radial opening grooves (the center line of the opening groove passes through the center of the annular plate) are processed on the inner circumference side of the annular plate 20, and a long strip-shaped protrusion structure is processed on the bottom surface of the brush box. When the brush assembly is installed on the annular plate, the positioning protrusion is directly inserted into the positioning groove to realize rapid positioning of the brush assembly, and then the brush box is fixed to the annular plate by bolts. The positioning groove and the positioning protrusion can ensure the concentricity of multiple brush assemblies, thereby ensuring close contact between the brush body and the rotor slip ring, and reducing the resistance between the brush body and the rotor slip ring.

[0033] Furthermore, if Figure 5 As shown, the brush box 30 is also provided with a second heat dissipation slot 302. Specifically, a plurality of long second heat dissipation slots are processed on the upper wall of the brush box 30 to dissipate heat from the brush body. Figure 7 and Figure 8As shown, it is a second embodiment of the brush body. The brush body 31 is provided with a first heat dissipation groove 312 at one end of the slip ring contact surface 310. In this embodiment, the first heat dissipation groove 312 is an open groove connected to the upper and lower surfaces of the brush body 31 processed at one end of the slip ring contact surface 310. Preferably, the first heat dissipation groove is at a certain angle to the upper and lower surfaces of the brush body. The first heat dissipation groove is provided on the brush body, which is conducive to the heat dissipation of the brush body. Further, the brush body 31 and the inner side wall of the brush body installation cavity 300 are provided with a heat dissipation channel 313. Specifically, a plurality of open grooves penetrating the front and rear end surfaces of the brush box can be processed on the inner side wall of the brush body installation cavity 300. When the brush body is installed in the brush box, the open grooves on the inner side wall of the brush body installation cavity 300 form a heat dissipation channel, which further facilitates the heat dissipation of the brush assembly.

[0034] Furthermore, a temperature sensor installation groove 303 is provided on the upper inner wall of the brush body installation cavity 300. Specifically, a groove is processed on the inner side of the upper box wall of the brush box, and the temperature sensor can be installed in the groove to collect and detect the temperature of the brush.

[0035] Furthermore, the annular plate 20 is provided with a plurality of heat dissipation holes 201. Specifically, a plurality of through holes are processed circumferentially on the annular plate, and the cooling air blown by the cooling fan of the yaw collector ring can pass through the heat dissipation holes to increase the heat dissipation effect of the yaw collector ring.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A yaw collector ring annular stator structure, characterized in that: include, A first mounting plate (10) and a second mounting plate (11) arranged opposite to each other; A plurality of insulating tie rods (12) for connecting the first mounting plate (10) and the second mounting plate (11); a plurality of annular plate assemblies (2) disposed between the first mounting plate (10) and the second mounting plate (11), the plurality of annular plate assemblies (2) being mounted on the insulating pull rod (12), a first insulator (13) being provided between the first mounting plate (10) and the adjacent annular plate assemblies (2), a second insulator (14) being provided between two adjacent annular plate assemblies (2), and a third insulator (15) being provided between the second mounting plate (11) and the adjacent annular plate assemblies (2); The annular plate assembly (2) comprises an annular plate (20), a brush assembly (3), a bracket (22) and a busbar (23); a plurality of brush assemblies (3) capable of contacting a rotor slip ring are mounted on the annular plate (20); the busbar (23) is mounted on the annular plate (20) via the bracket (22) and is connected to the brush assembly (3); the brush assembly (3) comprises a brush box (30), a brush body (31), a compression spring (32), a compression spring pressure plate (33) and a brush braid (34); The brush box (30) is mounted on the annular plate (20), a brush body mounting cavity (300) is provided in the brush box (30), one end of the brush body (31) is provided with a slip ring contact surface (310) that can contact the rotor slip ring, and the other end is fixedly connected to the brush braid (34), the brush body (31) is placed in the brush body mounting cavity (300) and one end provided with the slip ring contact surface (310) faces the center of the annular plate (20), the end of the brush body (31) to which the brush braid (34) is fixed is provided with the compression spring (32), and the compression spring pressure plate (33) is fixed on the brush box (30) so that one end of the compression spring (32) abuts against the brush body (31), and the other end abuts against the compression spring pressure plate (33); The annular plate (20) is provided with a radially arranged positioning groove (200), the brush box (30) is provided with a positioning protrusion (301) that can cooperate with the positioning groove (200), and when the brush box (30) is installed on the annular plate (20), the positioning protrusion (301) is placed in the positioning groove (200); and one end of the brush body (31) provided with a slip ring contact surface (310) is also provided with a first heat dissipation groove (312).

2. The yaw collector ring annular stator structure according to claim 1, characterized in that: The brush body (31) and the inner side wall of the brush body installation cavity (300) are provided with a heat dissipation channel (313).

3. The yaw collector ring annular stator structure according to claim 1, characterized in that: The brush box (30) is also provided with a second heat dissipation slot (302).

4. The yaw collector ring annular stator structure according to claim 1, characterized in that: A temperature sensor installation groove (303) is also provided on the upper inner wall of the brush body installation cavity (300).

5. The yaw collector ring annular stator structure according to claim 1, characterized in that: The annular plate (20) is also provided with a plurality of heat dissipation holes (201).

6. The yaw collector ring annular stator structure according to claim 1, characterized in that: The first insulator (13), the second insulator (14) and the third insulator (15) are sleeved on the insulating pull rod (12).

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