CN210839244U - Generator main shaft earthing device - Google Patents
Generator main shaft earthing device Download PDFInfo
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- CN210839244U CN210839244U CN201921690840.XU CN201921690840U CN210839244U CN 210839244 U CN210839244 U CN 210839244U CN 201921690840 U CN201921690840 U CN 201921690840U CN 210839244 U CN210839244 U CN 210839244U
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Abstract
The utility model relates to a generator large shaft grounding device, which comprises a copper braided braid brush, a guide part and a grounding lead wire, wherein the guide part is arranged outside the generator large shaft surface and pushes the copper braided braid brush against the large shaft surface of the generator; one end of the grounding lead is electrically connected with the copper braided braid brush, and the other end of the grounding lead is grounded. The grounding device adopts the copper braided braid brush for grounding, has large grounding area and good contact effect, and has higher grounding reliability by utilizing the abutting limit of the guide part; fundamentally has solved and has beaten the fire problem with beating between the generator main shaft, and generator main shaft earthing device simple structure can satisfy the requirement of large-scale industrial production, has wide application prospect and market.
Description
Technical Field
The utility model belongs to the technical field of the generator and specifically relates to a generator main shaft earthing device is related to.
Background
The turbine generator is one of the key devices in the power system, and the normal operation of the turbine generator is an important guarantee for the safe, reliable, high-quality and economic operation of the power system. In recent years, the single-machine capacity of the steam turbine generator unit is gradually increased, and the excitation modes of the steam turbine generator unit adopting a static self-shunt excitation system are more and more, so that the problem caused by the shaft voltage is not ignored. Meanwhile, because of the electromotive force generated on the shaft of the generator due to some factors, if sufficient protection measures are not taken during the installation or operation of the steam turbine generator, the shaft voltage is easily over-high. When the electromotive force reaches the degree of breaking through the insulating oil film, the discharge phenomenon can occur, which can lead to the deterioration of the insulating oil in the past, and in more serious cases, the shaft neck bearing bush can be burnt, and an electroerosion point is left on the shaft neck bearing bush, thereby causing the faults of forced shutdown and the like.
Regarding the treatment measure of the shaft voltage, the traditional method generally adopts the mode that one or two parallel large shaft grounding carbon brushes are arranged on the outer side of a bearing of a large shaft of a generator close to an end cover of a steam turbine. Referring to fig. 1, which is a schematic structural diagram of a generator grounding carbon brush apparatus in the prior art, the generator grounding carbon brush apparatus 10 includes a brush holder 11, a carbon brush holder 12, a grounding carbon brush 13, and a grounding lead 14. The brush holder 11 includes a part (not shown) fixedly connected with the generator and a part (not shown) for fixing the brush holder of the carbon brush; the carbon brush holder 12 is used for holding the grounding carbon brush 13 to enable the grounding carbon brush 13 to be in contact with a large shaft of a generator, a spring 121 and a conductive block 122 are arranged inside the carbon brush holder 12, and the spring 121 is located between the conductive block 122 and the grounding carbon brush 13; the ground lead 14 is electrically connected to the conductive block 122 for grounding the shaft voltage. When the large shaft is electrified due to the reasons of shaft voltage, poor rotor insulation, poor leakage and the like, the grounding carbon brush 13 is in direct contact with the large shaft and grounded by the grounding lead 14 device, so that current is led to the ground in time.
However, when the generator is operated, due to factors such as high rotating speed, severe oil pollution or reduced elasticity of the spring of the brush holder, poor contact between the grounding carbon brush and the large shaft of the generator is caused, the grounding carbon brush jumps and strikes fire on the surface of the large shaft of the generator, the function of eliminating the electrostatic voltage of the large shaft of the generator to the ground cannot be reliably exerted, and inaccurate one-point grounding protection measurement of the rotor of the generator is caused. In addition, the large shaft of the generator is oxidized seriously due to the jumping ignition, and the safe operation of the hydrogen cooling unit is threatened due to the long-term jumping ignition.
Aiming at the problem of jumping and sparking of the grounding carbon brush of the generator, the common solution is to eliminate the jumping and sparking of the grounding carbon brush by mainly replacing the grounding carbon brush, stopping and polishing the large shaft of the generator, adjusting the pressure of the grounding carbon brush and the like. However, these solutions not only take time and labor, increase the workload of the staff for routine maintenance, but also cannot fundamentally solve the problem of jumping and sparking between the large shaft of the generator and the grounding carbon brush.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims at overcoming the shortcoming that exists among the prior art, providing a reliable generator main shaft earthing device.
The utility model discloses a generator large shaft grounding device, which comprises a copper braided braid brush, a guide part and a grounding lead wire, wherein the guide part is arranged outside the generator large shaft surface and pushes the copper braided braid brush against the large shaft surface of the generator; one end of the grounding lead is electrically connected with the copper braided braid brush, and the other end of the grounding lead is grounded.
Compared with the prior art, the utility model discloses a generator main shaft earthing device adopts the copper to weave the pigtail brush and replaces traditional carbon brush, and the copper is woven the pigtail brush flexibility good, fatigue resistance is high, bend repeatedly difficult fracture, the wiring is convenient, mechanical strength is high, has good wearability, and the copper is woven the area of contact of pigtail brush and main shaft axial plane big, contact effect good. Furthermore, the copper braided braid brush is pressed and limited by the guide part, so that the grounding device of the large shaft of the generator has higher grounding reliability. The utility model discloses a generator main shaft earthing device fundamentally solved with the generator main shaft between beat the problem of striking sparks, in the follow-up generator main shaft voltage monitoring time measuring that carries out, its monitoring result is also more accurate reliable. And the generator large shaft grounding device has a simple structure, can meet the requirements of large-scale industrial production, and has wide application prospect and market.
Further, the guiding part comprises a guiding plate, the guiding plate is arranged along the radial direction of a large shaft of the generator, and one end of the guiding plate abuts against the copper braided braid brush on the shaft surface of the large shaft; or the guide part comprises two guide plates which are arranged oppositely to form a guide channel, and the copper woven braid is positioned in the guide channel and is abutted by the end part of one of the guide plates on the large shaft surface of the generator. Guide board and guide passage can be better right the copper is woven the pigtail and is brushed spacing, prevents to weave the skew of pigtail brush at major axis operation in-process copper, makes the contact of copper weaving pigtail brush and major axis is more reliable.
Further, the guiding part also comprises a guiding roller which is arranged at the end part of the guiding plate and abuts the copper braided braid on the large axial surface of the generator. The grounding and the subsequent replacement of the copper braided braid brush are facilitated.
Further, the grounding device for the large shaft of the generator further comprises a limiting part, wherein the limiting part is arranged on the outer side of the shaft surface of the large shaft of the generator and abuts against the copper braided braid brush on the shaft surface of the large shaft of the generator. Through the common limit of the guide part and the limit part, the copper braided braid brush is tightly supported on the large shaft surface, and the contact reliability of the copper braided braid brush and the large shaft is improved.
Furthermore, the limiting part comprises a limiting plate, the limiting plate is arranged along the radial direction of the large shaft of the generator, and one end of the limiting plate abuts against the copper braided braid brush on the shaft surface of the large shaft; or the limiting device comprises two limiting plates which are oppositely arranged and form a limiting channel, and the copper braided braid is positioned in the limiting channel and is abutted against the large axial surface of the generator by the end part of one of the limiting plates.
Furthermore, the limiting part also comprises a limiting roller which is arranged at the end part of the limiting plate and pushes the copper braided braid against the large axial surface of the generator.
Further, the generator main shaft grounding device further comprises a storage unit, the storage unit comprises a conveying roller, and one end of the copper braided braid brush is wound on the conveying roller. This memory cell is convenient for the storage and the change of copper braided braid brush, great reduction staff routine maintenance's work load.
Further, the generator main shaft grounding device further comprises a recovery unit, the recovery unit comprises a tightening roller, and the other end of the copper braided braid brush is wound on the tightening roller. The not good copper of recovery unit recovery in service behavior weaves the braid brush, has simplified the operation of changing the copper and has woven the braid brush, great reduction staff routine maintenance's work load.
Further, the recovery unit further comprises a motor, and the motor controls the rotation of the tightening roller. The motor can improve the efficiency of replacing the copper braided braid brush.
Further, generator main shaft earthing device still includes fixed unit, fixed unit includes the fixed plate, fixed plate fixed connection be in the other end of guide board, will the guide board with the copper is woven the pigtail and is brushed fixedly. The fixing unit enables the guide part and the copper braided braid brush to be better fixed on the generator.
Drawings
Fig. 1 is a schematic structural diagram of a large-shaft grounding carbon brush of a generator in the prior art.
Fig. 2 is a schematic overall structure diagram of the grounding device of the large shaft of the generator in the embodiment 1.
Fig. 3 is a partial structure schematic diagram of the grounding device of the large shaft of the generator in the embodiment 1.
Fig. 4 is a schematic overall structure diagram of the grounding device of the large shaft of the generator in the embodiment 2.
Fig. 5 is a partial structure schematic diagram of a grounding device of a large shaft of a generator in embodiment 2.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In order to make the technical solutions and advantages clearer, the present invention is further described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 2 and fig. 3, fig. 2 is a schematic view of an overall structure of a grounding device for a large shaft of a generator according to the present embodiment, and fig. 3 is a schematic view of a detailed structure of the grounding device for a large shaft of a generator according to the present embodiment. The generator large shaft grounding device 20 of the present embodiment includes a fixing unit 21, a guide portion 22, a copper braided braid brush 23, and a grounding lead 24.
The fixing unit 21 is used for fixing the grounding device on the generator end cover. Specifically, in this embodiment, the fixing unit 21 includes two fixing plates 211, the two fixing plates 211 are disposed opposite to each other and form a fixing channel 212, and the fixing channel 212 is bent along the axial plane with the axis of the large shaft as the center of the circle.
The guide portion 22 guides the direction of the copper braided braid brush and abuts against the large axial surface of the generator. Specifically, in the present embodiment, the guide part 22 includes two guide plates 221 and a guide roller 222, the two guide plates 221 are disposed opposite to each other and form the guide passage 223, one guide plate 221 is disposed along the radial direction of the large shaft of the generator, the guide roller 222 is disposed at the end of the guide plate 221, and the guide roller 22 is disposed to reduce stress in rotation.
One end of the copper braided braid brush 23 is located in the fixing channel 212, and the other end is pressed against the large axial surface by the guide roller 222 after passing through the guide channel 223.
One end of the ground lead 24 is electrically connected to the guide roller 222, and the other end is grounded. The ground lead 24 may receive the shaft voltage delivered by the copper braid brush and eliminate it from grounding.
The working principle of the generator grounding device of the embodiment is as follows: the copper braid brush 23 passes through the guide passage 223 of the guide portion 22, and is abutted against the large shaft surface of the generator by the guide roller 222, and is reliably contacted with the large shaft. When the large shaft rotates, the copper braided braid brush 23 is reliably and tightly contacted with the shaft surface of the large shaft under the common limiting action of the guide channel 223 and the guide roller 222, and when shaft voltage is generated, the shaft voltage is transmitted through the copper braided braid brush 23 and is grounded after being input into the grounding lead 24, so that the effect of eliminating the large shaft voltage is achieved.
Compared with the prior art, the utility model discloses a generator main shaft earthing device adopts the copper to weave the pigtail brush and replaces traditional carbon brush, and the copper is woven the pigtail brush flexibility good, fatigue resistance is high, bend repeatedly difficult fracture, the wiring is convenient, mechanical strength is high, has good wearability, and the copper is woven the area of contact of pigtail brush and main shaft axial plane big, contact effect good. The copper braided braid brush is pressed and limited by the guide part, so that the generator large-shaft grounding device has higher grounding reliability. The device fundamentally solves the problem of jumping and sparking between the device and the large shaft of the generator, and the monitoring result is more accurate and reliable when the voltage of the large shaft of the generator is monitored subsequently. And the generator large shaft grounding device has a simple structure, can meet the requirements of large-scale industrial production, and has wide application prospect and market.
Example 2
In order to ensure that the copper braided braid brush is reliably contacted with the large shaft surface, simplify the operation of replacing the copper braided braid brush and reduce the workload of daily maintenance of workers, the limiting part, the storage unit and the recovery unit are additionally arranged in embodiment 2 compared with embodiment 1. Referring to fig. 4 and 5, fig. 4 is a schematic view of an overall structure of the grounding device for a large shaft of a generator according to the present embodiment, and fig. 5 is a schematic view of a partial structure of the grounding device for a large shaft of a generator according to the present embodiment. The generator large shaft grounding device 30 of this embodiment includes a copper braided braid brush 31, a storage unit 32, a guide portion 33, a stopper portion 34, a recovery unit 35, and a ground lead 36.
The storage unit 32 comprises a first housing 321, a conveying roller 322, a first observation window 323 and a first opening 324, wherein the first housing 321 is arranged on a generator end cover; the conveying roller wheel 322 is positioned in the first shell, and one end of the copper braided braid brush 31 is wound on the conveying roller wheel 322; the first observation window 323 is located on the first housing 321, and is used for observing the storage amount of the copper braided braid brush 31. The first opening 324 is located on the generator end cover, and the copper braided braid brush 31 wound around the delivery roller 312 passes through the first opening 324.
The guiding part 33 comprises two guiding plates 331 and a guiding roller 332, one ends of the two guiding plates 331 are respectively and fixedly connected with two sides of the first opening 324, wherein one guiding plate 331 is arranged along the radial direction of the large shaft of the generator; the guide roller 332 is positioned at the other end of the guide plate 331; the two guide plates 331 are oppositely disposed and form a guide passage 333, and the width of the guide passage 333 is the same as the opening width of the first opening 324. After the copper braid brush 31 passes through the first opening 324 and the guide passage 333, the guide roller 332 at the end of the guided plate 331 abuts against the large axial surface of the generator.
The limiting portion 34 includes two limiting plates 341 and a limiting roller 342, wherein one of the limiting plates 341 is disposed along a major axis radial direction different from the guiding plate 331; the limiting roller 342 is arranged at one end of the limiting plate 341; the two limit plates 341 are oppositely arranged and form a limit channel 343. The copper braided braid brush 31 is abutted on the large shaft surface of the generator by the guide roller 332 and the limit roller 342 and then passes through the limit channel 343.
The recovery unit 35 includes a second housing 351, a take-up roller 352, a motor (not shown), and a second opening 353, the second housing 351 being provided on the generator end cover; the take-up roller 352 and the motor are both located in the second housing 351, wherein the motor controls the rotation of the take-up roller 352; the second opening 353 is disposed on the generator end cover, and the opening width thereof is equal to the width of the limiting channel 343. The copper braided braid brush passes through the limiting channel 343 and then is wound on the take-up roller 352 through the second opening 353.
One end of the ground lead 36 is electrically connected to the guide roller 332, and the other end is grounded. The ground lead 36 may receive the shaft voltage delivered by the copper braid brush and eliminate it from ground.
Specifically, the generator large shaft end cover is further provided with an observation window for observing the use condition of the copper braided braid brush abutted against the large shaft surface of the generator.
The working principle of the grounding device of the generator of the embodiment is as follows:
the copper braid brush 31 passes out of the feeding roller 322 of the storing unit 32, passes through the guide passage 333 of the guide portion 33, is simultaneously brought into contact with the shaft surface of the generator main shaft by the guide roller 332 and the stopper roller 342, and is wound around the take-up roller 352 of the collecting unit 36 after passing through the stopper passage 343 of the stopper portion 34 and being brought into contact with the main shaft.
When the large shaft rotates, the copper braided braid brush 31 is reliably and tightly contacted with the large shaft under the common limiting action of the guide roller 332 and the limiting roller 342; when a shaft voltage is generated, the shaft voltage is transmitted through the copper braided braid brush 31, and is input to the grounding lead 36 and then grounded, so that the large shaft voltage is eliminated. When finding through the observation window that the copper braided braid brush has greasy dirt or the situation of use is not good, accessible control motor starts to tighten up running roller 352, and the rotation that tightens up running roller 352 drives the removal of copper braided braid brush 31 to with the copper braided braid brush through the transport of carrying running roller 322, remove to spacing passageway 343 direction from guide channel 333, greasy dirt or the not good copper braided braid brush 31 of situation of use just can be retrieved to in retrieving unit 35.
Based on the working principle of the generator grounding device, the use condition of the copper braided braid brush is detected not only by the observation method in the embodiment, but also by other methods, for example, a lead is arranged on the limiting idler wheel, and the use condition of the copper braided braid brush can be detected by detecting the shaft voltage between the guide idler wheel and the limiting idler wheel.
Compared with the prior art, the generator large shaft grounding device of the utility model adopts the copper braided braid brush to replace the traditional carbon brush, the copper braided braid brush has good flexibility, high fatigue resistance, repeated bending, difficult fracture, convenient wiring, high mechanical strength and good wear resistance, and the contact area between the copper braided braid brush and the large shaft surface is large and the contact effect is good; the copper braided braid brush is reliably abutted against the shaft surface of the large shaft of the generator by utilizing the common limit of the guide roller of the guide part and the limit roller of the limit part, so that the whole grounding device has higher grounding reliability; through setting up recovery unit and memory cell, simplified the operation of changing the copper and woven the pigtail brush, great reduction staff's daily maintenance's work load to this earthing device has fundamentally solved and has beaten the fire problem with the beating between the generator main shaft, and when follow-up carrying out generator main shaft voltage monitoring, its monitoring result is also more accurate reliable. The generator large-shaft grounding device is simple in structure, can meet the requirements of large-scale industrial production, and has wide application prospects and markets.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. A generator main shaft grounding device is characterized in that: the copper braided braid brush is arranged on the outer side of a large shaft surface of a generator and is abutted against the large shaft surface of the generator; one end of the grounding lead is electrically connected with the copper braided braid brush, and the other end of the grounding lead is grounded.
2. The generator large shaft grounding device of claim 1, characterized in that: the guiding part comprises a guiding plate, the guiding plate is arranged along the radial direction of a large shaft of the generator, and one end of the guiding plate abuts against the copper braided braid brush on the shaft surface of the large shaft; or the guide part comprises two guide plates which are arranged oppositely to form a guide channel, and the copper woven braid is positioned in the guide channel and is abutted by the end part of one of the guide plates on the large shaft surface of the generator.
3. The generator large shaft grounding device of claim 2, characterized in that: the guiding part also comprises a guiding roller which is arranged at the end part of the guiding plate and enables the copper braided braid brush to be abutted against the large shaft surface of the generator.
4. The generator large shaft grounding device of claim 3, characterized in that: the limiting part is arranged on the outer side of the large shaft surface of the generator and abuts the copper braided braid on the large shaft surface of the generator.
5. The generator large shaft grounding device of claim 4, wherein: the limiting part comprises a limiting plate, the limiting plate is arranged along the radial direction of a large shaft of the generator, and one end of the limiting plate abuts against the copper braided braid on the shaft surface of the large shaft; or the limiting device comprises two limiting plates which are oppositely arranged and form a limiting channel, and the copper braided braid is positioned in the limiting channel and is abutted against the large axial surface of the generator by the end part of one of the limiting plates.
6. The generator large shaft grounding device of claim 5, wherein: the limiting part further comprises a limiting roller which is arranged at the end part of the limiting plate and enables the copper braided braid brush to be abutted against the large shaft surface of the generator.
7. The generator large shaft grounding device of claim 6, wherein: the copper braided braid brush is characterized by further comprising a storage unit, wherein the storage unit comprises a conveying roller, and one end of the copper braided braid brush is wound on the conveying roller.
8. The generator large shaft grounding device of claim 7, wherein: still include the recovery unit, the recovery unit includes a tightening roller, the other end of copper braided braid brush is convoluteed on the tightening roller.
9. The generator large shaft grounding device of claim 8, wherein: the recovery unit further comprises a motor, and the motor controls the tightening roller to rotate.
10. The generator large shaft grounding device of claim 2, characterized in that: still include a fixed unit, fixed unit includes the fixed plate, fixed plate fixed connection be in the other end of guide board will the guide board with the copper is woven the pigtail and is brushed fixedly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690840.XU CN210839244U (en) | 2019-10-10 | 2019-10-10 | Generator main shaft earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690840.XU CN210839244U (en) | 2019-10-10 | 2019-10-10 | Generator main shaft earthing device |
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| Publication Number | Publication Date |
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| CN210839244U true CN210839244U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921690840.XU Active CN210839244U (en) | 2019-10-10 | 2019-10-10 | Generator main shaft earthing device |
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| CN (1) | CN210839244U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630650A (en) * | 2020-11-11 | 2021-04-09 | 苏州热工研究院有限公司 | Generator shaft voltage acquisition device and system |
| CN114123597A (en) * | 2021-11-08 | 2022-03-01 | 珠海格力电器股份有限公司 | End cover device, control method, brushless direct current motor and air conditioner |
-
2019
- 2019-10-10 CN CN201921690840.XU patent/CN210839244U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630650A (en) * | 2020-11-11 | 2021-04-09 | 苏州热工研究院有限公司 | Generator shaft voltage acquisition device and system |
| CN114123597A (en) * | 2021-11-08 | 2022-03-01 | 珠海格力电器股份有限公司 | End cover device, control method, brushless direct current motor and air conditioner |
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Address after: 512100 Wushi Town, Qujiang District, Shaoguan City, Guangdong Province Patentee after: Guangdong Shaoguan Yuejiang Electricity Generation Co.,Ltd. Address before: 512100 Wushi Town, Qujiang District, Shaoguan City, Guangdong Province Patentee before: GUANGDONG SHAOGUAN YUEJIANG POWER GENERATION CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |