Cleaning device for a generator and its rotor shaft

Abstract

This invention discloses a cleaning device for a generator and its rotor shaft. The cleaning device includes: a permanent magnet, a cleaning brush, an electrical signal acquisition device, a control device, and an electromagnet. The permanent magnet is fixedly connected to the cleaning brush. The cleaning brush is disposed on the outer side of the generator rotor shaft. The electrical signal acquisition device is used to acquire electrical signals from the generator rotor shaft. The control device is connected to the electrical signal acquisition device and the electromagnet. The control device is configured to control the energization state of the electromagnet according to the electrical signals. The energization state includes an energized state and an unenergized state; the energized state includes a reverse energization state. When the electromagnet is in an unenergized state or a reverse energized state, the permanent magnet moves away from the electromagnet and drives the cleaning brush to move towards the generator rotor shaft, so that the cleaning brush contacts the generator rotor shaft. The technical solution of this invention can automatically clean the generator rotor shaft, improve the processing efficiency of high generator shaft voltage alarms, and reduce the operation and maintenance costs of power generation.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and more particularly to a cleaning device for a generator and its rotor shaft. Background Technology

[0002] Currently, to limit shaft voltage within a reasonable range, large-scale nuclear power units in China typically install a generator rotor shaft grounding device on the turbine side of the generator to release static charge. However, because the generator rotor shaft grounding device is located on the steam-side end cover of the generator, it is easily contaminated by lubricating oil and dust from the plant, leading to poor contact between the grounding device and the rotor shaft surface. This prevents the effective release of static charge generated on the generator rotor shaft, resulting in increased rotor shaft voltage and frequent triggering of high shaft voltage alarms.

[0003] Current generator maintenance techniques typically require maintenance personnel to travel from the office or elsewhere to the site after a high rotor shaft voltage alarm is triggered, and then wipe the shaft clean with cleaning materials. These existing techniques have several problems:

[0004] 1. Long response time for maintenance personnel and high shaft voltage alarms increase the monitoring burden on maintenance personnel.

[0005] 2. Maintenance personnel cleaning the main shaft with cleaning materials by hand poses a high risk to personal safety.

[0006] 3. Maintenance personnel need to frequently respond to high generator rotor shaft voltage alarms, increasing labor costs.

[0007] 4. Due to the long offline response time of maintenance personnel, the risk of electrical erosion damage to the generator bearings increases.

[0008] 5. If the rotor shaft is not cleaned in a timely manner, the grounding device may spark with the rotor shaft, damaging the grounding device and increasing the power plant's operation and maintenance costs. Summary of the Invention

[0009] This invention provides a cleaning device for a generator and its rotor shaft to solve the problems existing in the prior art, realize automatic cleaning of the generator rotor shaft, improve the processing efficiency of high generator shaft voltage alarm, reduce the operation and maintenance cost of power generation, and increase the service life of the generator.

[0010] In a first aspect, the present invention provides a cleaning device for a generator rotor shaft, comprising: a permanent magnet, a cleaning brush, an electrical signal acquisition device, a control device, and an electromagnet;

[0011] The permanent magnet is fixedly connected to the cleaning brush; the cleaning brush is disposed on the outside of the generator rotor shaft;

[0012] The electrical signal acquisition device is used to acquire the electrical signal of the generator rotor shaft;

[0013] The control device is connected to the electrical signal acquisition device and the electromagnet; the control device is configured to control the energization state of the electromagnet according to the electrical signal; the energization state includes an energized state and an unenergized state; the energized state includes a reverse energization state.

[0014] When the electromagnet is in the unenergized state or the reverse energized state, the permanent magnet moves away from the electromagnet and drives the cleaning brush to move towards the generator rotor shaft so that the cleaning brush comes into contact with the generator rotor shaft.

[0015] Optionally, the energized state further includes: a positive energized state;

[0016] When the electromagnet is in a positive energized state, the permanent magnet approaches the electromagnet and drives the cleaning brush to move away from the generator rotor shaft, so that the cleaning brush is disengaged from the generator rotor shaft.

[0017] Optionally, the generator rotor shaft cleaning device further includes: a spring;

[0018] The electromagnet is connected to the permanent magnet via the spring;

[0019] When the electromagnet is in the unenergized state, the sum of the weights of the permanent magnet and the cleaning brush is greater than the maximum tensile force of the spring.

[0020] When the electromagnet is in the reverse energized state, the sum of the weight of the permanent magnet and the cleaning brush and the repulsive force between the electromagnet and the permanent magnet is greater than the maximum tensile force of the spring.

[0021] When the electromagnet is in the positive energized state, the attractive force between the electromagnet and the permanent magnet is greater than the sum of the maximum contraction force of the spring and the weight of the permanent magnet and the cleaning brush.

[0022] Optionally, the curvature of the cleaning brush on the side closest to the generator rotor shaft is the same as the curvature of the generator rotor shaft.

[0023] Optionally, the cleaning brush includes a cleaning carbon brush;

[0024] The surface of the cleaning carbon brush is coated with conductive paste.

[0025] Optionally, the control device includes a controller, a power supply, and a control circuit;

[0026] The control circuit includes a first switch and an electromagnetic relay; the electromagnetic relay includes a first control circuit and a first normally closed switch.

[0027] The first terminal of the first switch is electrically connected to the positive terminal of the power supply; the second terminal of the first switch is electrically connected to the negative terminal of the power supply through the first control circuit.

[0028] The first terminal of the first normally closed switch is electrically connected to the positive terminal of the power supply; the second terminal of the first normally closed switch is electrically connected to the negative terminal of the power supply through the coil of the electromagnet of the cleaning device.

[0029] The controller is configured to control the state of the first switch based on the electrical signal.

[0030] Optionally, the controller is specifically configured to: control the first switch to be in an open state when the electrical signal is less than the first electrical signal; and control the first switch to be in a closed state when the electrical signal is greater than or equal to the first electrical signal.

[0031] Optionally, the control circuit further includes: a time relay;

[0032] The time relay includes a second control circuit and a second normally closed switch;

[0033] The electromagnetic relay also includes a first normally open switch;

[0034] The first terminal of the first normally open switch is electrically connected to the positive terminal of the power supply; the second terminal of the first normally open switch is electrically connected to the negative terminal of the power supply through the second control circuit.

[0035] The second normally closed switch is connected in series between the first control circuit and the negative terminal of the power supply.

[0036] Optionally, the control circuit of the generator rotor shaft cleaning device further includes: a second switch;

[0037] One end of the second switch is electrically connected to the second end of the first switch; the other end of the second switch is electrically connected to the positive terminal of the power supply.

[0038] In a second aspect, embodiments of the present invention also provide a generator, comprising: a generator rotor shaft and a cleaning device for the generator rotor shaft as described in any of the above claims;

[0039] The generator rotor shaft cleaning device is used to clean the generator rotor shaft.

[0040] The technical solution of this invention involves fixing a permanent magnet to a cleaning brush, with the cleaning brush positioned on the outside of the generator rotor shaft. This allows the permanent magnet to move the cleaning brush towards or away from the generator rotor shaft, enabling the cleaning brush to contact or disengage from the generator rotor shaft. An electrical signal acquisition device acquires the electrical signal from the generator rotor shaft. A control device is connected to the electrical signal acquisition device and an electromagnet. The control device is configured to control the energization state of the electromagnet based on the electrical signal. When the electromagnet is de-energized or energized in the reverse direction, the electromagnet repels the permanent magnet, causing the permanent magnet to move away from the electromagnet and drive the cleaning brush towards the generator rotor shaft, thus bringing the cleaning brush into contact with the generator rotor shaft. The cleaning brush automatically cleans the generator rotor shaft, improving the efficiency of handling high generator shaft voltage alarms, reducing power generation maintenance costs, and extending the generator's service life.

[0041] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of a cleaning device for a generator rotor shaft provided in an embodiment of the present invention;

[0044] Figure 2 An electrical schematic diagram of the control device for a generator rotor shaft cleaning device provided in an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0047] This embodiment provides a cleaning device for a generator rotor shaft. Figure 1 This is a schematic diagram of a generator rotor shaft cleaning device provided in an embodiment of the present invention, with reference to... Figure 1 As shown, the cleaning device for the generator rotor shaft includes a permanent magnet 10, a cleaning brush 20, an electrical signal acquisition device (not shown), a control device 30, and an electromagnet 40. The permanent magnet 10 is fixedly connected to the cleaning brush 20. The cleaning brush 20 is disposed on the outside of the generator rotor shaft 01. The electrical signal acquisition device is used to acquire electrical signals from the generator rotor shaft 01. The control device 30 is connected to the electrical signal acquisition device and the electromagnet 40. The control device 30 is configured to control the energization state of the electromagnet 40 according to the electrical signal. When the electromagnet 40 is in an unenergized state or in a reverse energized state, the permanent magnet 10 moves away from the electromagnet 40 and drives the cleaning brush 20 to move towards the generator rotor shaft 01 so that the cleaning brush 20 contacts the generator rotor shaft 01.

[0048] The cleaning brush 20 is used to clean the generator rotor shaft 01 when it comes into contact with the generator rotor shaft 01. The cleaning brush 20 may include, but is not limited to, carbon brushes such as resin carbon brushes and metal carbon brushes. In an optional embodiment, the type of carbon brush can be selected according to actual needs. This embodiment does not make specific limitations on this.

[0049] The control device 30 can be connected to the electrical signal acquisition device via an electrical connection or a communication connection. Similarly, the control device 30 can also be connected to the electromagnet via an electrical connection or a communication connection. The electrical signal acquisition device may include, but is not limited to, a voltage acquisition device and / or a current acquisition device. The electrical signal of the generator rotor shaft 01 may include the voltage signal and / or current signal of the generator rotor shaft 01. In an optional embodiment, controlling the energization state of the electromagnet 40 according to the electrical signal may include controlling the energization state of the electromagnet 40 to be either reverse energized or de-energized when the voltage signal is greater than a first voltage. The first voltage can be set according to actual cleaning needs. In an exemplary embodiment, the first voltage may be 20V.

[0050] The electromagnet 40 has two energized states: an energized state and an unenergized state. The energized state includes a reverse energized state. Specifically, when the electromagnet 40 is in the reverse energized state, the opposing magnetic poles of the electromagnet 40 and the permanent magnet 10 are of the same name, and they repel each other. This causes the permanent magnet 10 to move the cleaning brush 20 away from the electromagnet 40, i.e., closer to the generator rotor shaft 01. Thus, the cleaning brush 20 contacts the generator rotor shaft 01, and cleans the generator rotor shaft 01. For example, the permanent magnet 10 includes N and S poles arranged opposite to each other. When the N pole of the permanent magnet 10 is opposite to the electromagnet 40, the opposing magnetic pole of the electromagnet 40 in the reverse energized state is also the N pole; similarly, when the S pole of the permanent magnet 10 is opposite to the electromagnet 40, the opposing magnetic pole of the electromagnet 40 in the reverse energized state is also the S pole. When the electromagnet 40 is in an unenergized state, the permanent magnet 10 and the cleaning brush 20 can move towards the generator rotor shaft 01 under the action of gravity, so that the cleaning brush 20 contacts the generator rotor shaft 01 and cleans the generator rotor shaft 01.

[0051] In this embodiment, by fixing the permanent magnet to the cleaning brush and placing the cleaning brush on the outside of the generator rotor shaft, the permanent magnet drives the cleaning brush to move towards or away from the generator rotor shaft, thus enabling the cleaning brush to contact or detach from the generator rotor shaft. The electrical signal acquisition device acquires the electrical signal of the generator rotor shaft. The control device 30 is connected to the electrical signal acquisition device and the electromagnet. The control device 30 is configured to control the energization state of the electromagnet based on the electrical signal. When the electromagnet is in an unenergized state or a reverse energized state, the electromagnet and the permanent magnet repel each other, causing the permanent magnet to move away from the electromagnet and drive the cleaning brush towards the generator rotor shaft, thus bringing the cleaning brush into contact with the generator rotor shaft. The cleaning brush automatically cleans the generator rotor shaft, improving the processing efficiency of high generator shaft voltage alarms, reducing the operation and maintenance costs of power generation, and extending the service life of the generator.

[0052] Optionally, the energized state also includes a positive energized state; when the electromagnet 40 is in the positive energized state, the permanent magnet 10 approaches the electromagnet 40 and drives the cleaning brush 20 to move away from the generator rotor shaft 01, so that the cleaning brush 20 is disengaged from the generator rotor shaft 01.

[0053] In the forward energized state, when the electromagnet 40 is energized, the magnetic poles of the electromagnet 40 and the permanent magnet 10 are opposite magnetic poles. At this time, the electromagnet 40 and the permanent magnet 10 attract each other, causing the permanent magnet 10 to drive the cleaning brush 20 to move towards the side closer to the electromagnet 40, that is, away from the generator rotor shaft 01. Thus, the cleaning brush 20 is separated from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01.

[0054] In this embodiment, controlling the energization state of the electromagnet 40 according to the electrical signal may include controlling the energization state of the electromagnet 40 to be in a positive energized state when the voltage signal is less than or equal to a first voltage. The first voltage can be set according to actual cleaning needs. In an exemplary embodiment, the first voltage can be 20V.

[0055] In this embodiment, when the electromagnet 40 is in a positive energized state, the permanent magnet 10 approaches the electromagnet 40 and drives the cleaning brush 20 to move away from the generator rotor shaft 01, so that the cleaning brush 20 disengages from the generator rotor shaft 01. When the generator rotor shaft 01 does not need cleaning, the cleaning brush 20 can disengage from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01, thereby preventing excessive wear of the generator rotor shaft 01 and improving the service life of the generator rotor shaft 01.

[0056] Optional, continue to refer to Figure 1 As shown, the cleaning device for the generator rotor shaft also includes a spring 50; an electromagnet 40 is connected to a permanent magnet 10 via the spring 50; when the electromagnet 40 is not energized, the sum of the weights of the permanent magnet 10 and the cleaning brush 20 is greater than the maximum tensile force of the spring 50; when the electromagnet 40 is energized in the reverse direction, the sum of the weights of the permanent magnet 10 and the cleaning brush 20 and the repulsive force between the electromagnet 40 and the permanent magnet 10 is greater than the maximum tensile force of the spring 50; when the electromagnet 40 is energized in the forward direction, the attractive force between the electromagnet 40 and the permanent magnet 10 is greater than the maximum contraction force of the spring 50 and the sum of the weights of the permanent magnet 10 and the cleaning brush 20.

[0057] The spring 50 may include a compression spring. One end of the spring 50 is connected to the electromagnet 40, and the other end is connected to the permanent magnet 10, such that when the permanent magnet 10 moves away from the electromagnet 40, the spring 50 is stretched, and when the permanent magnet 10 moves closer to the electromagnet 40, the spring 50 is compressed. When the electromagnet 40 is not energized, the sum of the weights of the permanent magnet 10 and the cleaning brush 20 is greater than the maximum tensile force of the spring 50. When the electromagnet 40 is in a reverse energized state, the sum of the weights of the permanent magnet 10 and the cleaning brush 20, and the repulsive force between the electromagnet 40 and the permanent magnet 10, is greater than the maximum tensile force of the spring 50. Therefore, the permanent magnet 10 and the cleaning brush 20 can overcome the tensile force of the spring 50 and move towards the side closer to the generator rotor shaft 01, allowing the cleaning brush 20 to contact the generator rotor shaft 01 and clean it. When the electromagnet 40 is in a forward energized state, the attraction between the electromagnet 40 and the permanent magnet 10... The force is greater than the sum of the maximum contraction force of the spring 50 and the weight of the permanent magnet 10 and the cleaning brush 20, so that the permanent magnet 10 can drive the cleaning brush 20 to move away from the generator rotor shaft 01. Thus, the cleaning brush 20 can disengage from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01. In this way, by connecting the electromagnet 40 and the permanent magnet 10 through the spring 50, when the energization state of the electromagnet 40 changes, the permanent magnet 10 needs to overcome the elastic force of the spring 50 to move. This can limit the acceleration of the permanent magnet 10 driving the cleaning brush 20 when the energization state of the electromagnet 40 changes, which helps to improve the stability and reliability of the cleaning device.

[0058] In an optional embodiment, one end of the spring 50 is connected to the permanent magnet 10 through the spring base 60, which helps to increase the firmness of the connection between the spring 50 and the permanent magnet 10, so that the permanent magnet 10 is not easy to fall off when it is close to or away from the electromagnet 40.

[0059] In an alternative embodiment, continue to refer to Figure 1As shown, a rotor shaft grounding device is provided on the turbine side of the generator. The rotor shaft grounding device is supported by a bracket 001. The grounding terminal of the rotor shaft grounding device is mounted on the bracket via a first bolt 002 and a first washer 003. The grounding brush 004 of the rotor shaft grounding device is mounted on the bracket 001 via a second bolt 005, a second washer 006, a fastening nut 007, and a third washer 008. Between the second washer 006 and the bracket 001, there are also metal pressure plates 009 and metal washers 0010 located on opposite sides of the grounding brush 004. The cleaning device also includes a cleaning bracket 70, which can be mounted on the bracket 001 of the rotor shaft grounding device. For example, the cleaning bracket 70 can be mounted on the bracket 001 of the rotor shaft grounding device via the second bolt 005, the second washer 006, the fastening nut 007, and the third washer 008, thus saving space. In an optional embodiment, the cleaning bracket 70 includes a positioning bracket 71 and a limiting bracket 72. The positioning bracket 71 can be an L-shaped bracket, with one end of the L-shaped bracket fixed by a fastening bolt 007 and a third washer 008, and the other end connected to the electromagnet 40. The positioning bracket 71 is used to fix the electromagnet 40. The limiting bracket 72 is used to limit the position of the cleaning brush 20 in the direction perpendicular to the arrangement of the electromagnet 40 and the permanent magnet 10, so that the cleaning brush 20 can only move along the arrangement direction of the electromagnet 40 and the permanent magnet 10.

[0060] Optional, continue to refer to Figure 1 As shown, the curvature of the side of the cleaning brush 20 closest to the generator rotor shaft 01 is the same as the curvature of the generator rotor shaft 01, so that when the cleaning brush 20 contacts the generator rotor shaft 01, the contact surfaces of the cleaning brush 20 and the generator rotor shaft 01 can match, thereby improving the cleaning ability and cleaning efficiency of the cleaning brush 20.

[0061] Optionally, the cleaning brush 20 includes a cleaning carbon brush 21; the surface of the cleaning carbon brush 21 is coated with conductive grease to lubricate the cleaning carbon brush 21, so as to ensure that the cleaning brush 20 can slide freely.

[0062] Optional, Figure 2 An electrical schematic diagram of the control device for a generator rotor shaft cleaning apparatus provided in an embodiment of the present invention is shown below. Figure 2As shown, the control device 30 includes a controller (not shown), a power supply, and a control circuit 31. The control circuit 31 includes a first switch K1-2 and an electromagnetic relay. The electromagnetic relay includes a first control circuit KM1 and a first normally closed switch KM1 1-2. The first terminal of the first switch K1-2 is electrically connected to the positive terminal L of the power supply. The second terminal of the first switch K1-2 is electrically connected to the negative terminal N of the power supply through the first control circuit KM1. The first terminal of the first normally closed switch KM1 1-2 is electrically connected to the positive terminal L of the power supply. The second terminal of the first normally closed switch KM1 1-2 is electrically connected to the negative terminal N of the power supply through the coil of the electromagnet 40 of the cleaning device. The controller is configured to control the state of the first switch K1-2 according to the electrical signal.

[0063] The power supply can be, but is not limited to, a 220V AC power supply. In an exemplary embodiment, when the power supply is a 220V AC power supply, the connection to the positive terminal L of the power supply can be a connection to the live wire, and the connection to the negative terminal N of the power supply can be a connection to the neutral wire.

[0064] The first switch K1-2 can be a mechanical switch or an electrical switch, and the state of the first switch K1-2 includes a closed state and an open state.

[0065] In one optional embodiment, the controller, based on the electrical signal, controls the state of the first switch K1-2, which may include controlling the first switch K1-2 to be in an open state when the electrical signal is less than a first electrical signal, and controlling the first switch K1-2 to be in a closed state when the electrical signal is greater than or equal to the first electrical signal. The first electrical signal may be, but is not limited to, a first voltage.

[0066] The electromagnetic relay includes a first control circuit KM1 and a first normally closed switch KM1 1-2. The first switch K1-2 forms a closed circuit with the power supply through the first control circuit KM1 of the electromagnetic relay. When the first switch K1-2 is closed, the first control circuit KM1 is energized, thereby controlling the first normally closed switch KM1 1-2 to open. Since the first normally closed switch KM1 1-2 forms a circuit with the power supply through the coil of the electromagnet 40 of the cleaning device, the coil of the electromagnet 40 is not energized. Thus, the permanent magnet 10 moves away from the electromagnet 40 and drives the cleaning brush 20 to move towards the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01, thereby cleaning the generator rotor shaft 01. Conversely, when the first switch K1-2 is open, the first control circuit KM1 is not energized, causing the first normally closed switch KM1 1-2 to close, thus opening the first normally closed switch KM1 1-2. 1-2 The coil of the electromagnet 40 of the cleaning device forms a closed circuit with the power supply. The coil of the electromagnet 40 of the cleaning device is energized in the positive direction. Thus, the permanent magnet 10 approaches the electromagnet 40 and drives the cleaning brush 20 to move away from the generator rotor shaft 01, so that the cleaning brush 20 is disengaged from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01.

[0067] Specifically, the electrical signal acquisition device is used to acquire the electrical signal of the generator rotor shaft O1. When the electrical signal is greater than or equal to the first electrical signal, the controller controls the first switch K1-2 to be in the closed state, so that the first control circuit KM1 of the electromagnetic relay is energized, thereby opening the first normally closed switch KM1 1-2 of the electromagnetic relay. Since the first terminal of the first normally closed switch KM1 1-2 is electrically connected to the positive terminal L of the power supply, the first normally closed switch KM1... The second end of 1-2 is electrically connected to the negative terminal N of the power supply through the coil of the electromagnet 40 of the cleaning device, thus de-energizing the coil of the electromagnet 40. At this time, there is no interaction force between the electromagnet 40 and the permanent magnet 10, causing the permanent magnet 10 to drive the cleaning brush 20 to move towards the side closer to the generator rotor shaft 01, thereby making contact between the cleaning brush 20 and the generator rotor shaft 01, and cleaning the generator rotor shaft 01. Conversely, when the electrical signal is less than the first electrical signal, the controller controls the first switch K1-2 to be in the open state, so that the first control circuit KM1 of the electromagnetic relay is de-energized, thereby closing the first normally closed switch KM1 1-2 of the electromagnetic relay, and causing the first normally closed switch KM1 to... 1-2 The coil of the electromagnet 40 of the cleaning device forms a closed circuit with the power supply. When the coil of the electromagnet 40 of the cleaning device is energized in the positive direction, the electromagnet 40 and the permanent magnet 10 attract each other, causing the permanent magnet 10 to drive the cleaning brush 20 to move towards the side closer to the electromagnet 40, that is, away from the generator rotor shaft 01. Thus, the cleaning brush 20 is disengaged from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01. In this way, the control logic of the control device 30 can be simplified, which helps to reduce the cost of the cleaning device.

[0068] Optional, continue to refer to Figure 2 As shown, the control circuit 31 also includes a time relay; the time relay includes a second control circuit KT and a second normally closed switch KT1-2; the electromagnetic relay also includes a first normally open switch KM1 11-21; the first terminal of the first normally open switch KM1 11-21 is electrically connected to the positive terminal L of the power supply; the second terminal of the first normally open switch KM1 11-21 is electrically connected to the negative terminal N of the power supply through the second control circuit KT; the second normally closed switch KT1-2 is connected in series between the first control circuit KM1 and the negative terminal N of the power supply.

[0069] Specifically, the second normally closed switch KT1-2 of the time relay is connected in series between the first control circuit KM1 and the negative terminal N of the power supply. The first terminal of the first normally open switch KM1 11-21 is electrically connected to the positive terminal L of the power supply, and the second terminal of the first normally open switch KM1 11-21 is electrically connected to the negative terminal N of the power supply through the second control circuit KT. When the first switch K1-2 is closed, the first switch K1-2, the first control circuit KM1 of the electromagnetic relay, the second normally closed switch KT1-2 of the time relay, and the power supply form a closed circuit, causing the first normally open switch KM1 11-21 of the electromagnetic relay to close. Since the first terminal of the first normally open switch KM1 11-21 of the electromagnetic relay is electrically connected to the positive terminal L of the power supply, and the second terminal of the first normally open switch KM1 11-21 is electrically connected to the negative terminal N of the power supply through the second control circuit KT, the first normally open switch KM1... 11-21 and the second control circuit KT of the time relay form a closed loop with the power supply, causing the time relay to start timing. Simultaneously, the first normally closed switch KM11-2 of the electromagnetic relay opens, de-energizing the coil of the electromagnet 40 in the cleaning device. At this time, the permanent magnet 10 drives the cleaning brush 20 to move closer to the generator rotor shaft 01, thus bringing the cleaning brush 20 into contact with the generator rotor shaft 01 and cleaning it. When the timing of the time relay reaches the delay time, the second normally closed switch KT1-2 of the time relay opens, de-energizing the first control circuit KM1 of the electromagnetic relay, thus de-energizing the first normally closed switch KM1 of the electromagnetic relay. When 1-2 is closed, the coil of the electromagnet 40 of the cleaning device is energized in the positive direction, causing the permanent magnet 10 to drive the cleaning brush 20 to move towards the side closer to the electromagnet 40, that is, away from the generator rotor shaft 01. As a result, the cleaning brush 20 disengages from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01. In this way, the maximum cleaning time of the cleaning device on the generator rotor shaft 01 can be controlled, preventing the cleaning device from causing excessive wear on the generator rotor shaft 01, which is beneficial to improving the service life of the generator rotor shaft 01.

[0070] Optional, continue to refer to Figure 2 As shown, the control circuit 31 of the generator rotor shaft cleaning device also includes a second switch SB; one end of the second switch SB is electrically connected to the second end of the first switch K1-2; the other end of the second switch SB is electrically connected to the positive terminal L of the power supply.

[0071] The second switch SB can be a manual switch. Specifically, when the second switch SB is closed, the second switch SB and the first control circuit KM1 of the electromagnetic relay form a closed circuit with the power supply, thereby opening the first normally closed switch KM11-2 of the electromagnetic relay, so that the coil of the electromagnet 40 of the cleaning device is not energized, and the permanent magnet 10 drives the cleaning brush 20 to move towards the side closer to the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01 and cleans the generator rotor shaft 01.

[0072] In this embodiment, by electrically connecting one end of the second switch SB to the second end of the first switch K1-2, and the other end of the second switch SB to the positive terminal L of the power supply, maintenance personnel can close the second switch SB to control the cleaning device to clean the generator rotor shaft 01 when they find that the generator rotor shaft 01 is dirty or sparking. This reduces the frequency of high generator shaft voltage alarms and improves the service life of the generator.

[0073] Based on the same inventive concept, this embodiment also provides a generator, including: a generator rotor shaft and a cleaning device for the generator rotor shaft provided in any of the above embodiments; the cleaning device for the generator rotor shaft is used to clean the generator rotor shaft. Since the generator provided in this embodiment includes the cleaning device for the generator rotor shaft provided in any of the above embodiments, it can achieve the function of the cleaning device for the generator rotor shaft provided in any of the above embodiments. Therefore, the generator provided in this embodiment has the beneficial effects of the cleaning device for the generator rotor shaft provided in any of the above embodiments. For similarities, please refer to the above description.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A cleaning device for a generator rotor shaft, characterized in that, include: Permanent magnets, cleaning brushes, electrical signal acquisition devices, control devices, and electromagnets; The permanent magnet is fixedly connected to the cleaning brush; the cleaning brush is disposed on the outside of the generator rotor shaft; The electrical signal acquisition device is used to acquire the electrical signal of the generator rotor shaft; The control device is connected to the electrical signal acquisition device and the electromagnet; the control device is configured to control the energization state of the electromagnet according to the electrical signal; the energization state includes an energized state and an unenergized state; the energized state includes a reverse energization state. When the electromagnet is in the unenergized state or the reverse energized state, the permanent magnet moves away from the electromagnet and drives the cleaning brush to move towards the generator rotor shaft so that the cleaning brush comes into contact with the generator rotor shaft.

2. The generator rotor shaft cleaning device according to claim 1, characterized in that, The energized state also includes: positive energization state; When the electromagnet is in a positive energized state, the permanent magnet approaches the electromagnet and drives the cleaning brush to move away from the generator rotor shaft, so that the cleaning brush is disengaged from the generator rotor shaft.

3. The generator rotor shaft cleaning device according to claim 2, characterized in that, Also includes: spring; The electromagnet is connected to the permanent magnet via the spring; When the electromagnet is in the unenergized state, the sum of the weights of the permanent magnet and the cleaning brush is greater than the maximum tensile force of the spring. When the electromagnet is in the reverse energized state, the sum of the weight of the permanent magnet and the cleaning brush and the repulsive force between the electromagnet and the permanent magnet is greater than the maximum tensile force of the spring. When the electromagnet is in the positive energized state, the attractive force between the electromagnet and the permanent magnet is greater than the sum of the maximum contraction force of the spring and the weight of the permanent magnet and the cleaning brush.

4. The generator rotor shaft cleaning device according to claim 1, characterized in that, The curvature of the cleaning brush on the side closest to the generator rotor shaft is the same as the curvature of the generator rotor shaft.

5. The generator rotor shaft cleaning device according to claim 1, characterized in that, The cleaning brushes include cleaning carbon brushes; The surface of the cleaning carbon brush is coated with conductive paste.

6. The generator rotor shaft cleaning device according to claim 1, characterized in that, The control device includes a controller, a power supply, and a control circuit; The control circuit includes a first switch and an electromagnetic relay; the electromagnetic relay includes a first control circuit and a first normally closed switch. The first terminal of the first switch is electrically connected to the positive terminal of the power supply; the second terminal of the first switch is electrically connected to the negative terminal of the power supply through the first control circuit. The first terminal of the first normally closed switch is electrically connected to the positive terminal of the power supply; the second terminal of the first normally closed switch is electrically connected to the negative terminal of the power supply through the coil of the electromagnet of the cleaning device. The controller is configured to control the state of the first switch based on the electrical signal.

7. The generator rotor shaft cleaning device according to claim 6, characterized in that, The controller is specifically configured to: control the first switch to be in an open state when the electrical signal is less than the first electrical signal; and control the first switch to be in a closed state when the electrical signal is greater than or equal to the first electrical signal.

8. The generator rotor shaft cleaning device according to claim 6, characterized in that, The control circuit also includes: a time relay; The time relay includes a second control circuit and a second normally closed switch; The electromagnetic relay also includes a first normally open switch; The first terminal of the first normally open switch is electrically connected to the positive terminal of the power supply; the second terminal of the first normally open switch is electrically connected to the negative terminal of the power supply through the second control circuit. The second normally closed switch is connected in series between the first control circuit and the negative terminal of the power supply.

9. The generator rotor shaft cleaning device according to claim 6, characterized in that, The control circuit also includes: a second switch; One end of the second switch is electrically connected to the second end of the first switch; the other end of the second switch is electrically connected to the positive terminal of the power supply.

10. A generator, characterized in that, include: A generator rotor shaft and a cleaning device for the generator rotor shaft according to any one of claims 1-9; The generator rotor shaft cleaning device is used to clean the generator rotor shaft.

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