Generator and cleaning device of rotor shaft thereof

Abstract

The utility model discloses a generator and a cleaning device for a rotor shaft of the generator. The cleaning device comprises a permanent magnet, a cleaning brush, an electric signal acquisition device, a control device and an electromagnet, the permanent magnet is fixedly connected with the cleaning brush; the cleaning brush is arranged on the outer side of the generator rotor shaft; the electric signal acquisition device is used for acquiring electric signals of a generator rotor shaft; the control device is connected with the electric signal acquisition device and the electromagnet; the control device is configured to control the power-on state of the electromagnet according to the electric signal; the power-on state comprises a power-on state and a non-power-on state; the power-on state comprises a reverse power-on state; and when the electromagnet is in a non-electrified state or a reverse electrified state, the permanent magnet is far away from the electromagnet and drives the cleaning brush to move towards one side of the generator rotor shaft, so that the cleaning brush is in contact with the generator rotor shaft. According to the technical scheme, the generator rotor shaft can be automatically cleaned, the processing efficiency of generator shaft voltage high alarm is improved, and the operation and maintenance cost of power generation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a cleaning device for a generator and a rotor shaft thereof. Background Art

[0002] At present, in order to limit the shaft voltage within a reasonable range, the steam turbine generators of large nuclear power units in China are generally equipped with a generator rotor shaft grounding device on the steam turbine side of the generator to release static charge. However, since the generator rotor shaft grounding device is set on the steam side end cover of the generator, it is easy to adhere to pollutants on the surface of the generator rotor shaft due to the influence of lubricating oil and dust in the factory, resulting in poor contact between the generator rotor shaft grounding device and the generator rotor shaft surface. The static charge generated by the generator rotor shaft cannot be effectively released, resulting in an increase in the generator rotor shaft voltage, causing the high shaft voltage alarm to be frequently triggered.

[0003] The existing generator maintenance technology usually requires maintenance personnel to rush to the site from the office or other places to wipe the main shaft with cleaning materials after the generator rotor shaft voltage high alarm is triggered. The existing maintenance technology has the following problems:

[0004] 1. The operation and maintenance personnel have a long response time, and the high shaft voltage alarm increases the monitoring burden of the operation and maintenance personnel.

[0005] 2. The operation and maintenance personnel use cleaning materials to clean the large shaft with their bare hands, which poses a high risk to personal safety.

[0006] 3. Operation and maintenance personnel need to frequently respond to the generator rotor shaft voltage high alarm, increasing labor costs.

[0007] 4. Due to the long offline response time of operation and maintenance personnel, the risk of electrical corrosion damage to the generator bearing is increased.

[0008] 5. Failure to clean the rotor shaft in time causes sparks between the grounding device and the rotor shaft, which damages the grounding device and increases the operation and maintenance costs of the power plant. Utility Model Content

[0009] The utility model 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 the generator shaft high 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 utility model 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 arranged on the outer side 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 power-on state of the electromagnet according to the electrical signal; the power-on state includes a power-on state and a non-power-on state; the power-on state includes a reverse power-on state;

[0014] When the electromagnet is in the non-energized state or the reverse energized state, the permanent magnet moves away from the electromagnet and drives the cleaning brush to move toward the generator rotor shaft so that the cleaning brush contacts the generator rotor shaft.

[0015] Optionally, the power-on state further includes: a forward power-on state;

[0016] When the electromagnet is in a forward 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 separated from the generator rotor shaft.

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

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

[0019] When the electromagnet is in the unpowered state, the sum of the gravity of the permanent magnet and the cleaning brush is greater than the maximum tensile elastic force of the spring;

[0020] When the electromagnet is in the reverse energized state, the sum of the gravity 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 elastic force of the spring;

[0021] When the electromagnet is in the forward energized state, the attraction between the electromagnet and the permanent magnet is greater than the sum of the maximum contraction elastic force of the spring and the gravity of the permanent magnet and the cleaning brush.

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

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

[0024] Conductive paste is applied on the surface of the cleaning carbon brush.

[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 loop and a first normally closed switch;

[0027] The first end of the first switch is electrically connected to the positive electrode of the power supply; the second end of the first switch is electrically connected to the negative electrode of the power supply through the first control loop;

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

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

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

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

[0032] The time relay comprises a second control loop and a second normally closed switch;

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

[0034] The first end of the first normally open switch is electrically connected to the positive electrode of the power supply; the second end of the first normally open switch is electrically connected to the negative electrode of the power supply through the second control loop;

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

[0036] Optionally, the control circuit of the cleaning device for the generator rotor shaft 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 electrode of the power supply.

[0038] In a second aspect, an embodiment of the utility model further provides a generator, comprising: a generator rotor shaft and a cleaning device for the generator rotor shaft as described in any one of the above items;

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

[0040] The technical solution of the utility model is to make the permanent magnet and the cleaning brush fixedly connected, and the cleaning brush is arranged on the outside of the generator rotor shaft, so that when the permanent magnet drives the cleaning brush to move, it can move toward or away from the generator rotor shaft, so as to achieve the contact or separation of the cleaning brush and the generator rotor shaft; by making the electric signal acquisition device acquire the electric signal of the generator rotor shaft, the control device is connected with the electric signal acquisition device and the electromagnet, and the control device is configured to control the power-on state of the electromagnet according to the electric signal, so that when the electromagnet is in an unpowered state or a reversely powered state, the electromagnet repels the permanent magnet, so that the permanent magnet is away from the electromagnet, and drives the cleaning brush to move toward one side of the generator rotor shaft, so that the cleaning brush contacts the generator rotor shaft, and the cleaning brush automatically cleans the generator rotor shaft, thereby improving the processing efficiency of the generator shaft voltage high alarm, reducing the operation and maintenance cost of power generation, and increasing the service life of the generator.

[0041] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0044] Figure 2 An electrical schematic diagram of a control device for a cleaning device for a generator rotor shaft provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0047] This embodiment provides a cleaning device for a generator rotor shaft. Figure 1 A schematic diagram of a cleaning device for a generator rotor shaft provided by an embodiment of the utility model, referring to Figure 1 As shown, the cleaning device of the generator rotor shaft includes a permanent magnet 10, a cleaning brush 20, an electric signal acquisition device (not shown in the figure), 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 arranged on the outside of the generator rotor shaft 01; the electric signal acquisition device is used to obtain the electric signal of the generator rotor shaft 01; the control device 30 is connected to the electric signal acquisition device and the electromagnet 40; the control device 30 is configured to control the power-on state of the electromagnet 40 according to the electric signal; when the electromagnet 40 is in an unpowered state or a reversely powered state, the permanent magnet 10 moves away from the electromagnet 40 and drives the cleaning brush 20 to move toward one side of the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01.

[0048] Among them, the cleaning brush 20 is used to clean the generator rotor shaft 01 when it contacts the generator rotor shaft 01. The cleaning brush 20 can 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, and this embodiment does not make specific limitations on this.

[0049] The control device 30 may be connected to the electric signal acquisition device by an electric connection or a communication connection. Similarly, the control device 30 may be connected to the electromagnet by an electric connection or a communication connection. The electric signal acquisition device may include but is not limited to a voltage acquisition device and / or a current acquisition device. The electric signal of the generator rotor shaft 01 may include a voltage signal and / or a current signal of the generator rotor shaft 01. In an optional embodiment, according to the electric signal, the power-on state of the control electromagnet 40 may include when the voltage signal is greater than the first voltage, the power-on state of the control electromagnet 40 is a reverse power-on state or a non-power-on state, wherein the first voltage may be set according to the actual cleaning requirements. In an exemplary embodiment, the first voltage may be 20V.

[0050] The energized state of the electromagnet 40 includes an energized state and an unenergized state, and the energized state includes a reverse energized state. When the energized state of the electromagnet 40 is the reverse energized state, the magnetic poles of the electromagnet 40 and the permanent magnet 10 are the same magnetic poles, and the electromagnet 40 and the permanent magnet 10 repel each other, so that the permanent magnet 10 drives the cleaning brush 20 to move to the side away from the electromagnet 40, that is, the side close to the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01, and the cleaning brush 20 cleans the generator rotor shaft 01; illustratively, the permanent magnet 10 includes an N pole and an S pole that are arranged in opposite directions, and when the N pole of the permanent magnet 10 is opposite to the electromagnet 40, the magnetic pole of the electromagnet 40 opposite to the permanent magnet 10 in the reverse energized state is also the N pole; when the S pole of the permanent magnet 10 is opposite to the electromagnet 40, the magnetic pole of the electromagnet 40 opposite to the permanent magnet 10 in the reverse energized state is also the S pole. When the electromagnet 40 is powered off, the permanent magnet 10 and the cleaning brush 20 can move toward 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, the permanent magnet is fixedly connected to the cleaning brush, and the cleaning brush is arranged on the outside of the generator rotor shaft, so that when the permanent magnet drives the cleaning brush to move, it can move toward or away from the generator rotor shaft, so as to achieve contact or separation between the cleaning brush and the generator rotor shaft; the electrical signal acquisition device is enabled to acquire the electrical signal of the generator rotor shaft, and the control device 30 is connected to the electrical signal acquisition device and the electromagnet. The control device 30 is configured to control the power-on state of the electromagnet according to the electrical signal, so that when the electromagnet is in an unpowered state or a reversely powered state, the electromagnet repels the permanent magnet, so that the permanent magnet moves away from the electromagnet and drives the cleaning brush to move toward one side of the generator rotor shaft, so that the cleaning brush contacts the generator rotor shaft, and the cleaning brush automatically cleans the generator rotor shaft, thereby improving the processing efficiency of the generator shaft voltage high alarm, reducing the operation and maintenance cost of power generation, and increasing the service life of the generator.

[0052] Optionally, the power-on state also includes a forward power-on state; when the electromagnet 40 is in the forward power-on 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 separated from the generator rotor shaft 01.

[0053] Among them, the positive energized state is when the electromagnet 40 is energized, the relative magnetic poles of the electromagnet 40 and the permanent magnet 10 are the energized state of opposite magnetic poles. At this time, the electromagnet 40 and the permanent magnet 10 attract each other, so that the permanent magnet 10 drives the cleaning brush 20 to move toward the side close to the electromagnet 40, that is, away from the generator rotor shaft 01, so that 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, according to the electrical signal, the power-on state of the control electromagnet 40 may include that when the voltage signal is less than or equal to the first voltage, the power-on state of the control electromagnet 40 is a forward energized state, wherein the first voltage can be set according to actual cleaning requirements. In an exemplary embodiment, the first voltage can be 20V.

[0055] In this embodiment, when the electromagnet 40 is in a forward 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 separated from the generator rotor shaft 01, so that when the generator rotor shaft 01 does not need to be cleaned, the cleaning brush 20 can be separated from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01, thereby preventing the generator rotor shaft 01 from excessive wear and improving the service life of the generator rotor shaft 01.

[0056] Optional, continue to refer to Figure 1 As shown, the cleaning device of the generator rotor shaft also includes a spring 50; the electromagnet 40 is connected to the permanent magnet 10 through the spring 50; when the electromagnet 40 is in an unpowered state, the sum of the gravity of the permanent magnet 10 and the cleaning brush 20 is greater than the maximum tensile elastic force of the spring 50; when the electromagnet 40 is in a reverse powered state, the sum of the gravity 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 elastic force of the spring 50; when the electromagnet 40 is in a forward powered state, the attractive force between the electromagnet 40 and the permanent magnet 10 is greater than the maximum contraction elastic force of the spring 50 and the sum of the gravity 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, so that when the permanent magnet 10 is away from the electromagnet 40, the spring 50 is stretched, and when the permanent magnet 10 is close to the electromagnet 40, the spring 50 is compressed. When the electromagnet 40 is in an unpowered state, the sum of the gravity of the permanent magnet 10 and the cleaning brush 20 is greater than the maximum tensile elastic force of the spring 50. When the electromagnet 40 is in a reverse powered state, the sum of the gravity 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 elastic force of the spring 50, so that the permanent magnet 10 and the cleaning brush 20 can overcome the tensile elastic force of the spring 50 and move to the side close to the generator rotor shaft 01, so that the cleaning brush 20 can contact the generator rotor shaft 01, and the cleaning brush 20 cleans the generator rotor shaft 01; when the electromagnet 40 is in a forward powered state, the attraction between the electromagnet 40 and the permanent magnet 10 The force is greater than the maximum contraction elastic force of the spring 50 and the sum of the gravity of the permanent magnet 10 and the cleaning brush 20, so that the permanent magnet 10 can drive the cleaning brush 20 to move to the side away from the generator rotor shaft 01, so that the cleaning brush 20 can be separated 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 power-on state of the electromagnet 40 changes, the permanent magnet 10 needs to overcome the elastic force of the spring 50 to move, thereby limiting the acceleration of the cleaning brush 20 driven by the permanent magnet 10 when the power-on state of the electromagnet 40 changes, which is beneficial to improving 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 is beneficial 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 the permanent magnet 10 approaches or moves 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, and the rotor shaft grounding device is provided with a bracket 001. The grounding terminal of the rotor shaft grounding device is installed on the bracket through a first bolt 002 and a first gasket 003, and the grounding brush braid 004 of the rotor shaft grounding device is installed on the bracket 001 through a second bolt 005, a second gasket 006, a fastening nut 007 and a third gasket 008. A metal pressing plate 009 and a metal gasket 0010 located on opposite sides of the grounding brush braid 004 are also included between the second gasket 006 and the bracket 001. The cleaning device also includes a cleaning bracket 70, and the cleaning bracket 70 can be provided on the bracket 001 of the rotor shaft grounding device. Exemplarily, the cleaning bracket 70 can be installed on the bracket 001 of the rotor shaft grounding device through the second bolt 005, the second gasket 006, the fastening nut 007 and the third gasket 008, so that space can be saved. 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, one end of the L-shaped bracket is fixed by a fastening bolt 007 and a third gasket 008, and the other end is connected to the electromagnet 40, and 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 perpendicular to the arrangement direction 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 close 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; a conductive paste is applied to the surface of the cleaning carbon brush 21 to lubricate the cleaning carbon brush 21 to ensure that the cleaning brush 20 can slide freely.

[0062] Optional, Figure 2 The electrical schematic diagram of the control device of a cleaning device for a generator rotor shaft provided by the embodiment of the utility model is shown in FIG. Figure 2As shown, the control device 30 includes a controller (not shown in the figure), 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 loop KM1 and a first normally closed switch KM1 1-2; the first end of the first switch K1-2 is electrically connected to the positive pole L of the power supply; the second end of the first switch K1-2 is electrically connected to the negative pole N of the power supply through the first control loop KM1; the first end of the first normally closed switch KM1 1-2 is electrically connected to the positive pole L of the power supply; the second end of the first normally closed switch KM1 1-2 is electrically connected to the negative pole 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 may 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 pole L of the power supply may be a connection to the live wire, and the connection to the negative pole N of the power supply may be a connection to the neutral wire.

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

[0065] In an optional embodiment, the controller controls the state of the first switch K1-2 according to the electrical signal, which may include controlling the first switch K1-2 to be in an open state when the electrical signal is less than the 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, so that when the first switch K1-2 is in a closed state, the first control circuit KM1 is energized, so that the first control circuit KM1 controls the first normally closed switch KM1 1-2 to be disconnected. 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 of the cleaning device is not energized. In this way, the permanent magnet 10 moves away from the electromagnet 40 and drives the cleaning brush 20 to move toward the side of the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01, and then the cleaning brush 20 can clean the generator rotor shaft 01; correspondingly, when the first switch K1-2 is in an open state, the first control circuit KM1 is not energized, so that the first normally closed switch KM11-2 is in a closed state, so that the first normally closed switch KM1 1-2 A closed loop is formed by the coil of the electromagnet 40 of the cleaning device and the power supply, and the coil of the electromagnet 40 of the cleaning device is energized in the positive direction, so that 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 separated from the generator rotor shaft 01, and then the cleaning brush 20 stops cleaning the generator rotor shaft 01.

[0067] Specifically, the electrical signal acquisition device is used to collect the electrical signal of the generator rotor shaft 01. 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 a closed state, so that the first control loop KM1 of the electromagnetic relay is energized, so that the first normally closed switch KM1 1-2 of the electromagnetic relay is disconnected. Since the first end of the first normally closed switch KM1 1-2 is electrically connected to the positive electrode L of the power supply, the first normally closed switch KM1 1-2 is electrically connected to the positive electrode L of the power supply. The second end of 1-2 is electrically connected to the negative pole N of the power supply through the coil of the electromagnet 40 of the cleaning device, so that the coil of the electromagnet 40 of the cleaning device is not energized. At this time, there is no interaction force between the electromagnet 40 and the permanent magnet 10, so that the permanent magnet 10 drives the cleaning brush 20 to move toward the side close to the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01, and the cleaning brush 20 cleans the generator rotor shaft 01; on the contrary, when the electrical signal is less than the first electrical signal, the controller controls the first switch K1-2 to be in an open state, so that the first control circuit KM1 of the electromagnetic relay is not energized, so that the first normally closed switch KM1 1-2 of the electromagnetic relay is in a closed state, so that the first normally closed switch KM1 1-2 A closed loop is formed by the coil of the electromagnet 40 of the cleaning device and the power supply, and the coil of the electromagnet 40 of the cleaning device is energized in the positive direction. At this time, the electromagnet 40 and the permanent magnet 10 attract each other, so that the permanent magnet 10 drives the cleaning brush 20 to move toward the side close to the electromagnet 40, that is, the side away from the generator rotor shaft 01, so that the cleaning brush 20 is separated 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 is conducive to reducing 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 loop KT and a second normally closed switch KT1-2; the electromagnetic relay also includes a first normally open switch KM1 11-21; the first end of the first normally open switch KM1 11-21 is electrically connected to the positive pole L of the power supply; the second end of the first normally open switch KM1 11-21 is electrically connected to the negative pole N of the power supply through the second control loop KT; the second normally closed switch KT1-2 is connected in series between the first control loop KM1 and the negative pole 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 loop KM1 and the negative pole N of the power supply, the first end of the first normally open switch KM1 11-21 is electrically connected to the positive pole L of the power supply, and the second end of the first normally open switch KM1 11-21 is electrically connected to the negative pole N of the power supply through the second control loop KT. When the first switch K1-2 is closed, the first switch K1-2, the first control loop KM1 of the electromagnetic relay and the second normally closed switch KT1-2 of the time relay form a closed loop with the power supply, so that the first normally open switch KM1 11-21 of the electromagnetic relay is closed. Since the first end of the first normally open switch KM1 11-21 of the electromagnetic relay is electrically connected to the positive pole L of the power supply; the second end of the first normally open switch KM1 11-21 is electrically connected to the negative pole N of the power supply through the second control loop KT, the first normally open switch KM1 11-21 and the second control circuit KT of the time relay form a closed circuit with the power supply, so that the time relay starts timing. At the same time, the first normally closed switch KM11-2 of the electromagnetic relay is disconnected, so that the coil of the electromagnet 40 of the cleaning device is not energized. At this time, the permanent magnet 10 drives the cleaning brush 20 to move toward the side close to the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01, and the cleaning brush 20 cleans the generator rotor shaft 01; when the timing time of the time relay reaches the delay time, the second normally closed switch KT1-2 of the time relay is disconnected, so that the first control circuit KM1 of the electromagnetic relay is not energized, so that the first normally closed switch KM11-2 of the electromagnetic relay 1-2 is closed, and the coil of the electromagnet 40 of the cleaning device is energized in the positive direction, so that the permanent magnet 10 drives the cleaning brush 20 to move toward the side close to the electromagnet 40, that is, the side away from the generator rotor shaft 01, so that the cleaning brush 20 is separated from the generator rotor shaft 01, and the cleaning brush 20 stops cleaning the generator rotor shaft 01. In this way, the maximum time for the cleaning device to clean the generator rotor shaft 01 can be controlled, preventing the cleaning device from causing excessive wear to the generator rotor shaft 01, which is beneficial to increasing 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 cleaning device for the generator rotor shaft further 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 electrode L of the power supply.

[0071] 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, so that the first normally closed switch KM11-2 of the electromagnetic relay is disconnected, so that the coil of the electromagnet 40 of the cleaning device is not energized, so that the permanent magnet 10 drives the cleaning brush 20 to move toward the side close to the generator rotor shaft 01, so that the cleaning brush 20 contacts the generator rotor shaft 01, and the cleaning brush 20 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 electrically connecting the other end of the second switch SB to the positive electrode L of the power supply, when the operation and maintenance personnel find that the generator rotor shaft 01 is dirty or sparking, they can control the cleaning device to clean the generator rotor shaft 01 by closing the second switch SB, thereby reducing the frequency of the generator shaft voltage high alarm and increasing 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 by the embodiment of the utility model includes the cleaning device for the generator rotor shaft provided in any of the above embodiments, it can realize the function of the cleaning device for the generator rotor shaft provided in any of the above embodiments. Therefore, the generator provided by the embodiment of the utility model has the beneficial effects of the cleaning device for the generator rotor shaft provided in any of the above embodiments. Please refer to the above description for the similarities.

[0074] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A cleaning device for a rotor shaft of a generator, It is characterized in that include: Permanent magnet, cleaning brush, electrical signal acquisition device, control device and electromagnet; The permanent magnet is fixedly connected to the cleaning brush; the cleaning brush is arranged on the outer side 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 power-on state of the electromagnet according to the electrical signal; the power-on state includes a power-on state and a non-power-on state; the power-on state includes a reverse power-on state; When the electromagnet is in the non-energized state or the reverse energized state, the permanent magnet moves away from the electromagnet and drives the cleaning brush to move toward the generator rotor shaft so that the cleaning brush contacts the generator rotor shaft.

2. The cleaning device for the rotor shaft of a generator according to claim 1, It is characterized in that The power-on state also includes: a forward power-on state; When the electromagnet is in a forward 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 separated from the generator rotor shaft.

3. The cleaning device for the rotor shaft of the generator according to claim 2, It is characterized in that Also includes: spring; The electromagnet is connected to the permanent magnet via the spring; When the electromagnet is in the unpowered state, the sum of the gravity of the permanent magnet and the cleaning brush is greater than the maximum tensile elastic force of the spring; When the electromagnet is in the reverse energized state, the sum of the gravity 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 elastic force of the spring; When the electromagnet is in the forward energized state, the attraction between the electromagnet and the permanent magnet is greater than the sum of the maximum contraction elastic force of the spring and the gravity of the permanent magnet and the cleaning brush.

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

5. The cleaning device for the rotor shaft of a generator according to claim 1, It is characterized in that The cleaning brush comprises a cleaning carbon brush; Conductive paste is applied on the surface of the cleaning carbon brush.

6. The cleaning device for the rotor shaft of a generator according to claim 1, It is 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 loop and a first normally closed switch; The first end of the first switch is electrically connected to the positive electrode of the power supply; the second end of the first switch is electrically connected to the negative electrode of the power supply through the first control loop; The first end of the first normally closed switch is electrically connected to the positive electrode of the power supply; the second end of the first normally closed switch is electrically connected to the negative electrode of the power supply through the coil of the electromagnet of the cleaning device; The controller is configured to control a state of the first switch according to the electrical signal.

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

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

9. The cleaning device for the rotor shaft of a generator according to claim 6, It is characterized in that The control circuit further 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 electrode of the power supply.

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

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