Grounding carbon brush structure for preventing electric corrosion of bearing of wind turbine generator

Abstract

The utility model discloses a grounding carbon brush structure for preventing electric corrosion of a bearing of a wind turbine generator system, which comprises a plurality of groups of grounding discharge assemblies for performing grounding discharge treatment on a conducting ring on a wind turbine shaft body, and an annular mounting plate is sleeved on the outer side of the wind turbine shaft body. According to the grounding carbon brush structure for preventing electric corrosion of the bearing of the wind turbine generator, through mutual cooperation of the installation assembly, the elastic assembly and the supporting assembly, current generated on the shaft body of the wind turbine generator is guided to the ground through the conducting ring, the grounding carbon brush head, the brush braid, the wire and the ground wire, electric corrosion of the bearing is avoided, and in addition, in the grounding discharge process, the service life of the bearing is prolonged. Through the supporting effect, lateral movement and even deformation of the grounding carbon brush head are restrained, it is guaranteed that the grounding carbon brush head can normally stretch out in the radial direction under the effect of the elastic force, and normal contact conduction use between the grounding carbon brush head and the conducting ring is further facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation grounding technical field, concretely is the grounding carbon brush structure of wind turbine bearing electric erosion prevention. BACKGROUND

[0002] In the process of wind power generation operation, the shaft current will be generated on the main shaft due to the common mode voltage of the converter, the magnetic circuit imbalance, the static electricity accumulation and other factors, in order to avoid the electric erosion caused by the shaft current to the bearing, the grounding carbon brush structure is arranged on the wind turbine for grounding and conducting.

[0003] In the process of grounding and conducting, in order to ensure the normal installation and feeding movement of the grounding carbon brush head on the retainer, the installation gap of the grounding carbon brush head on the retainer is large, in addition, in order to ensure the effective contact between the grounding carbon brush head and the conducting ring, the inner side of the retainer is provided with a spring assembly for radially pushing the grounding carbon brush head, so that the front end of the grounding carbon brush head abuts against the outer side of the conducting ring with a certain force, and in the actual operation process, the lateral thrust will be generated on the grounding carbon brush head along with the rotating action of the shaft body and the conducting ring and the abutting and extruding action of the grounding carbon brush head (see the schematic diagram in the accompanying drawings Figure 8 , and due to the large installation gap between the grounding carbon brush head and the retainer, the supporting force of the retainer on the grounding carbon brush head is limited, under the action of the lateral thrust, the grounding carbon brush head will be laterally displaced or even deformed, and the lateral displacement of the grounding carbon brush head will cause the grounding carbon brush head to abut against the inner side wall of the retainer, which will generate resistance to the normal radial extension of the subsequent grounding carbon brush head, and affect the normal contact and conducting use between the grounding carbon brush head and the conducting ring.

[0004] Therefore, the grounding carbon brush structure of wind turbine bearing electric erosion prevention is needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing the grounding carbon brush structure of wind turbine bearing electric erosion prevention to solve the problems in the background art.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: the grounding carbon brush structure of wind turbine bearing electric erosion prevention, including the grounding discharge assembly for grounding and discharging the conducting ring on the wind turbine shaft body, the outer side of the wind turbine shaft body is provided with an annular mounting plate, the grounding discharge assembly is provided with multiple groups, and the multiple groups of grounding discharge assemblies are arranged in the form of annular array on one side of the annular mounting plate, the grounding discharge assembly comprises a grounding carbon brush head and a retainer for mounting and connecting the grounding carbon brush head, the grounding carbon brush head is provided with a brush braid, the brush braid and the ground wire are electrically connected through the wire, and the utility model further comprises:

[0007] The mounting component is disposed between the retainer and the annular mounting plate to assist in the detachable installation connection of the retainer. The bottom of the retainer is open, and the front side of the retainer has a slot for the inner grounding carbon brush head to extend out.

[0008] The elastic component is located inside the retainer and is used to push the grounding carbon brush head with elastic force. One end of the grounding carbon brush head extends out of the slot under the action of the elastic component and is set against the conductive ring.

[0009] And a support assembly located inside the cage for lateral support of the grounded carbon brush head.

[0010] The support components are provided in two sets, and the two sets of support components are symmetrically arranged on both sides of the grounding carbon brush head.

[0011] The support assembly includes a support plate disposed inside the cage, and a pressing assembly for pressing and pushing the support plate is disposed between the cage and the support plate. The end of the support plate is provided with an inclined surface for abutting and driving against the grounding carbon brush head. A rolling assembly for assisting the radial feeding of the grounding carbon brush head during the support process is disposed on one side of the support plate.

[0012] The extrusion assembly includes multiple sets of sleeves fixed inside the retainer. A slide rod is slidably connected to each sleeve. One end of the slide rod is fixed to a support plate. A first spring is sleeved on the outside of each sleeve. The two ends of the first spring abut against the inner wall of the support plate and the retainer, respectively.

[0013] Multiple sets of the rolling components are arranged horizontally on one side of the support plate.

[0014] The rolling assembly includes a spherical groove formed on one side of the support plate, and the interior of the spherical groove is rotatably connected to a ball bearing for supporting and resisting the grounded carbon brush head.

[0015] The elastic component includes a positioning frame disposed inside the retainer for engaging one end of the grounding carbon brush head, and a second spring is installed inside the retainer for elastically pushing the positioning frame.

[0016] The positioning frame has clearance grooves on both sides to allow the support plate to avoid being pushed by the elastic force.

[0017] The mounting assembly includes a base fixed to one side of an annular mounting plate, and side plates fixed to both sides of the retainer. The side plates are fixed to the base by bolts.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This utility model discloses a grounding carbon brush structure for preventing bearing electro-erosion in wind turbines. Through the cooperation of the installation component, elastic component, and support component, the current generated on the wind turbine shaft is guided to the ground through the conductive ring, grounding carbon brush head, brush braid, wire, and ground wire, thus preventing bearing electro-erosion. In addition, during the grounding discharge process, the support action inhibits the lateral movement or even deformation of the grounding carbon brush head, ensuring that the grounding carbon brush head can extend radially normally under the action of elasticity, further facilitating normal contact and conductivity between the grounding carbon brush head and the conductive ring. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the positional relationship of the wind turbine shaft, annular mounting plate, conductive ring, and various grounding discharge components of this utility model.

[0022] Figure 3 This is a schematic diagram of the grounding discharge component of this utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the grounding discharge component of this utility model;

[0024] Figure 5 This is a schematic diagram showing the positional relationship between the elastic component, the support component, and the elastic component of this utility model;

[0025] Figure 6 This is a schematic diagram of the support component and rolling component structure of this utility model;

[0026] Figure 7 This is a schematic diagram of the elastic component structure of this utility model;

[0027] Figure 8 This is a schematic diagram of the force applied to the grounding carbon brush head of this utility model.

[0028] In the diagram: 1-Wind turbine shaft; 2-Annular mounting plate; 3-Conductive ring; 401-Cage; 402-Grounding carbon brush head; 403-Slot; 404-Wire; 501-Base; 502-Side plate; 503-Bolt; 601-Positioning frame; 602-Second spring; 701-Support plate; 702-Sloping surface; 801-Sleeve; 802-Slide rod; 803-First spring; 901-Spherical groove; 902-Ball; 10-Allowing groove. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-8 The grounding carbon brush structure for preventing bearing electro-erosion of wind turbine units provided by this utility model includes a grounding discharge component for grounding discharge treatment of conductive ring 3 on wind turbine shaft 1, and an annular mounting plate 2 is sleeved on the outer side of wind turbine shaft 1.

[0031] It should be noted here that: when in use, the annular mounting plate 2 is installed and fixed on the wind turbine, and the conductive ring 3 is fixed on the wind turbine shaft 1. The wind turbine shaft 1 and the annular mounting plate 2 are conventional components in this application, and their installation methods and positions are known technologies, so they will not be described in detail here.

[0032] The grounding discharge assembly is provided in multiple sets, and the multiple sets of grounding discharge assemblies are arranged in a ring array on one side of the ring mounting plate 2. The grounding discharge assembly includes a grounding carbon brush head 402 and a retainer 401 for mounting and connecting the grounding carbon brush head 402. The grounding carbon brush head 402 is provided with a brush braid, and the brush braid is electrically connected to the grounding wire through a conductor 404.

[0033] It should be noted here that the current generated on the wind turbine shaft 1 is guided to the ground through the conductive ring 3, the grounding carbon brush head 402, the brush braid, the wire 404 and the ground wire, so as to avoid the bearing from electrolytic corrosion. The entire grounding discharge process is prior art in the technical field of this application. The connection and control between the grounding carbon brush head 402, the brush braid, the wire 404 and the ground wire will not be described in detail here.

[0034] Also includes:

[0035] The mounting component is set between the retainer 401 and the annular mounting plate 2 to assist in the detachable installation connection of the retainer 401. The bottom of the retainer 401 is open, and the front side of the retainer 401 is provided with a slot 403 for the inner grounding carbon brush head 402 of the retainer 401 to extend out.

[0036] The elastic component is disposed inside the retainer 401 to elastically push the grounding carbon brush head 402, and one end of the grounding carbon brush head 402 extends out of the slot 403 under the action of the elastic component and is set against the conductive ring 3;

[0037] And a support assembly disposed inside the retainer 401 for lateral support of the grounding carbon brush head 402;

[0038] It should be noted that the grounding carbon brush structure for preventing bearing electro-erosion in wind turbines, through the cooperation of the installation components, elastic components, and support components, guides the current generated on the wind turbine shaft 1 to the ground via the conductive ring 3, grounding carbon brush head 402, brush braid, wire 404, and ground wire, thus preventing bearing electro-erosion. In addition, during grounding discharge, the support function inhibits lateral movement or even deformation of the grounding carbon brush head 402, ensuring that the grounding carbon brush head 402 can extend radially normally under the action of elasticity, further facilitating normal contact and conductivity between the grounding carbon brush head 402 and the conductive ring 3.

[0039] Two sets of support components are provided, and the two sets of support components are symmetrically arranged on both sides of the grounding carbon brush head 402;

[0040] It should be noted here that the support effect is ensured by using two sets of support components.

[0041] The support assembly includes a support plate 701 disposed inside the retainer 401. A pressing assembly for pressing and pushing the support plate 701 is disposed between the retainer 401 and the support plate 701. An inclined surface 702 for abutting and driving against the grounding carbon brush head 402 is provided at the end of the support plate 701. A rolling assembly for assisting the radial feeding of the grounding carbon brush head 402 is disposed on one side of the support plate 701.

[0042] It should be noted that during the installation process of the grounding carbon brush head 402 being pushed towards the inside of the retainer 401, the grounding carbon brush head 402 abuts against the inclined surfaces 702 of the support plates 701 on the two sets of support components. During the abutment process, the two sets of support plates 701 are pushed away from each other until the grounding carbon brush head 402 is pushed between the two sets of support plates 701. After the grounding carbon brush head 402 is pushed in, the elastic squeezing action of the squeezing component on the support plate 701 causes each set of ball bearings 902 on the support plate 701 to abut against the side of the grounding carbon brush head 402, providing lateral support for the grounding carbon brush head 402.

[0043] The extrusion assembly includes multiple sets of sleeves 801 fixed inside the retainer 401. A slide rod 802 is slidably connected to the sleeve 801. One end of the slide rod 802 is fixed to the support plate 701, and the other end of the slide rod 802 extends into the inside of the sleeve 801 and is slidably connected to the sleeve 801. The end of the sleeve 801 away from the slide rod 802 is fixed to the inside of the retainer 401. A first spring 803 is sleeved on the outside of the sleeve 801. The two ends of the first spring 803 are respectively abutted against the inner wall of the support plate 701 and the retainer 401.

[0044] It should be noted that: the multiple sets of sleeves 801 and slide rods 802 facilitate the telescopic and guiding movement of the auxiliary support plate 701, and the first spring 803 facilitates the elastic compression of the support plate 701.

[0045] Multiple sets of rolling components are arranged horizontally on one side of the support plate 701;

[0046] It should be noted here that stable support is ensured through multiple sets of scrolling components.

[0047] The rolling assembly includes a spherical groove 901 formed on one side of the support plate 701, and a ball bearing 902 for supporting the grounded carbon brush head 402 is rotatably connected inside the spherical groove 901.

[0048] It should be noted that the ball bearings 902 inside each set of spherical grooves 901 can ensure lateral support for the grounding carbon brush head 402 without affecting the normal radial feed motion of the grounding carbon brush head 402.

[0049] The elastic component includes a positioning frame 601 disposed inside the retainer 401 for mounting one end of the grounding carbon brush head 402, and a second spring 602 for elastically pushing the positioning frame 601 is installed inside the retainer 401.

[0050] It should be noted that the positioning frame 601 facilitates the positioning of the grounding carbon brush head 402, and the second spring 602 facilitates the elastic pushing of the grounding carbon brush head 402.

[0051] The positioning frame 601 has clearance grooves 10 on both sides to avoid the support plate 701 during the elastic pushing process;

[0052] It should be noted that the clearance groove 10 facilitates the positioning frame 601 to avoid the support plate 701 during radial feed movement.

[0053] The mounting assembly includes a base 501 fixed to one side of the annular mounting plate 2, and side plates 502 fixed to both sides of the retainer 401. The side plates 502 and the base 501 are connected and fixed by bolts 503.

[0054] It should be noted here that the base 501, side plate 502 and bolt 503 facilitate the installation and removal of the auxiliary retainer 401 on the annular mounting plate 2.

[0055] Working Principle: During use, the grounding carbon brush structure for preventing bearing electro-erosion in wind turbine units involves installing each set of grounding carbon brush heads 402 onto their respective retainers 401. During installation, the positioning frame 601 is pre-pressed and pushed. During this pushing process, the second spring 602 is deformed by the compression, generating elastic force. This compression and pushing of the positioning frame 601 allows the grounding carbon brush head 402 to be pushed into the interior of the retainer 401. After the positioning frame 601 is compressed and compressed, the grounding carbon brush head 402 is pushed into the inner side of the retainer 401, and one end of the grounding carbon brush head 402 is engaged inside the positioning frame 601. At this point, through the elastic force of the second spring 602 and the connection between the grounding carbon brush head 402 and the positioning frame 601, one end of the grounding carbon brush head 402 is pushed outward from the slot 403 (see...). Figure 3 and Figure 4 (state)

[0056] During the process of pushing the grounding carbon brush head 402 toward the inside of the retainer 401, the grounding carbon brush head 402 abuts against the inclined surface 702 of the support plate 701 on the two sets of support components. During the abutting process, the two sets of support plates 701 are pushed away from each other by force until the grounding carbon brush head 402 is pushed between the two sets of support plates 701. After the grounding carbon brush head 402 is pushed in, the elastic squeezing action of the squeezing component on the support plate 701 causes each set of ball bearings 902 on the support plate 701 to abut against the side of the grounding carbon brush head 402.

[0057] During the process of the grounding carbon brush head 402 being installed on the retainer 401 and pushing the two sets of support plates 701 away from each other, the movement of the support plates 701 pushes the slide rod 802 to slide on the sleeve 801 and causes the first spring 803 to be squeezed and deformed to generate elastic force. After the grounding carbon brush head 402 is installed on the retainer 401, the retainers 401 are evenly distributed on the annular mounting plates 2 through the installation assembly. During the installation process, the elastic force of the elastic assembly causes the front end of the grounding carbon brush head 402 on the retainer 401 to abut against the conductive ring 3. After installation, with the use of the grounding carbon brush structure, the current generated on the wind turbine shaft 1 is guided to the ground through the conductive ring 3, the grounding carbon brush head 402, the brush braid, the wire 404 and the grounding wire, thus avoiding electrolytic corrosion of the bearing.

[0058] During the grounding discharge process, as the wind turbine shaft 1 and conductive ring 3 rotate, the end of the grounding carbon brush head 402 that abuts against the outer side of the conductive ring 3 will wear. During the wear process, the elastic component pushes the grounding carbon brush head 402 radially, keeping the front end of the grounding carbon brush head 402 abutting against the outer side of the conductive ring 3, ensuring the stability of the grounding discharge. In addition, during the rotation of the conductive ring 3, the interaction between the rotating conductive ring 3 and the front end of the grounding carbon brush head 402 will generate a lateral thrust on the grounding carbon brush head 402, causing the grounding carbon brush head 402 to tend to move laterally. During the installation of the grounding carbon brush head 402, the first spring 80... The reaction force generated by 3 will push the support plate 701 with elastic force, so that the sets of ball bearings 902 on the support plate 701 will provide lateral support for the grounding carbon brush head 402, suppressing the lateral movement or even deformation of the grounding carbon brush head 402, and ensuring that the grounding carbon brush head 402 can extend radially normally under the action of elastic force. This further facilitates normal contact and conductivity between the grounding carbon brush head 402 and the conductive ring 3. In addition, during the entire lateral support process, the flexible lateral support is formed by the telescopic connection of the sleeve 801 and the slide rod 802 to the support plate 701 and the elastic force of the first spring 803, avoiding damage to the grounding carbon brush head 402 caused by rigid support.

[0059] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A grounding carbon brush structure for preventing bearing electric erosion of a wind turbine generator, comprising a grounding discharge assembly for grounding and discharging a conductive ring on a wind turbine shaft body, an annular mounting plate is sleeved on the outer side of the wind turbine shaft body, the grounding discharge assembly comprises a grounding carbon brush head, a holder and a brush braid, the brush braid is electrically connected with the ground wire through a wire, the bottom of the holder is in an open shape, the inner side of the holder is provided with an elastic assembly for elastically pushing the grounding carbon brush head, and a second spring for elastically pushing the grounding carbon brush head is arranged on the elastic assembly. characterized in that Further comprising: a supporting assembly arranged in the inner part of the holder for laterally supporting the grounding carbon brush head, the supporting assembly comprises a supporting plate arranged in the inner part of the holder, an extrusion assembly for extruding and pushing the supporting plate is arranged between the holder and the supporting plate, an inclined surface for transmission against the grounding carbon brush head is arranged at the end of the supporting plate, and a rolling assembly for assisting the radial feeding of the grounding carbon brush head in the supporting process is arranged on one side of the supporting plate; the rolling assembly comprises a spherical groove arranged on one side of the supporting plate, and a ball is rotatably connected in the inner part of the spherical groove for supporting the grounding carbon brush head.

2. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 1, characterized in that: The supporting assembly is provided with two groups, and the two groups of supporting assemblies are symmetrically arranged on both sides of the grounding carbon brush head.

3. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 1, characterized in that: An installation assembly for assisting the detachable installation connection of the holder is arranged between the holder and the annular mounting plate, a slot for the extension of the grounding carbon brush head in the inner side of the holder is arranged on the front side of the holder, and one end of the grounding carbon brush head extends from the slot under the action of the elastic assembly and is arranged against the conductive ring.

4. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 3, characterized in that: The extrusion assembly comprises a plurality of sleeve pipes fixed in the inner part of the holder, a sliding rod is slidably connected on the sleeve pipe, one end of the sliding rod is fixed with the supporting plate, a first spring is sleeved on the outer side of the sleeve pipe, and both ends of the first spring are arranged against the inner wall of the holder and the supporting plate.

5. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 4, characterized in that: The rolling assembly is provided with a plurality of groups in a transverse arrangement state on one side of the supporting plate.

6. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 5, characterized in that: The elastic assembly comprises a positioning frame arranged in the inner part of the holder for clamping and installing one end of the grounding carbon brush head, and both ends of the second spring are arranged against the inner wall of the holder and the positioning frame.

7. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 6, characterized in that: The positioning frame is provided with an avoidance groove for avoiding the supporting plate in the elastic pushing process on both sides of the positioning frame.

8. The grounding carbon brush structure for preventing bearing galvanic corrosion of a wind turbine generator set according to claim 3, characterized in that: The installation assembly comprises a base fixed on one side of the annular mounting plate, side plates are fixed on both sides of the holder, and the side plates and the base are fixed through bolt connection.

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