Generator shaft current harmonic real-time filtering and shaft voltage accurate suppression device

Abstract

This invention discloses a generator shaft current harmonic filtering and shaft voltage precise suppression device, belonging to the technical field of generator protection devices. During generator operation, the device, through the cooperation of a detection module, filtering module, active compensation module, control module, and discharge component, precisely offsets shaft voltage fluctuations on the shaft. Simultaneously, the grounding brush on the discharge component provides a low-resistance grounding path for the shaft, discharging residual shaft voltage and harmonic current, stabilizing the shaft potential within a safe range. Furthermore, during grounding brush operation, the cooperation of a pressure component, elastic component, drive component, and linkage component maintains a relatively stable compressive force on the grounding brush during wear, ensuring good contact between the grounding brush and the shaft, further guaranteeing the normal discharge of shaft voltage, shaft current, and high-frequency harmonic current to the ground.

Description

Technical Field

[0001] This invention relates to the field of generator protection device technology, specifically a generator shaft current harmonic filtering and shaft voltage precise suppression device. Background Technology

[0002] During operation, power plants generate electricity through generators. However, during generator operation, factors such as magnetic circuit asymmetry, excitation system harmonics, winding capacitance coupling, and grid interference can induce shaft voltage on the shaft. After the shaft voltage breaks down the bearing oil film, it forms a shaft current, accompanied by a large number of harmonic components. This results in shaft current harmonics and shaft voltage fluctuations. The shaft voltage and shaft current harmonics can repeatedly break down the bearing oil film, causing electrical erosion, pitting, and grooves inside the bearing. This leads to bearing damage, increased unit vibration, and increased noise. At the same time, the harmonics can interfere with the control system, affecting the safe and stable operation of the generator. In severe cases, it can cause bearing burnout and unit shutdown.

[0003] To reduce shaft current harmonics and shaft voltage fluctuations, a device is used for real-time current harmonic filtering and precise suppression. The device includes a detection module, a filtering module, an active compensation module, a control module, and a grounding brush. During operation, the detection module first collects the shaft voltage and shaft current harmonic signals of the generator shaft in real time and transmits the collected signals to the control module. After analyzing and processing the signals, the control module sends control commands to the filtering module and the active compensation module. The filtering module specifically filters out the harmonic components in the shaft current, and the active compensation module outputs a reverse compensation signal to precisely cancel the shaft voltage fluctuations on the shaft. At the same time, the grounding brush provides a low-resistance grounding path for the shaft, dissipating residual shaft voltage and harmonic current, and stabilizing the shaft potential within a safe range. The various modules and the grounding brush work together to achieve shaft current harmonic filtering and precise shaft voltage control, avoiding bearing erosion, unit vibration, and shutdown due to malfunctions, and ensuring stable generator operation.

[0004] During the discharge of shaft voltage, shaft current, and high-frequency harmonic current, the grounding brush of the above-mentioned device is kept in contact with the outer side of the shaft by the elastic force of the spring. However, during the contact friction, as the front end of the grounding brush wears, the grounding brush moves. Since the spring is relatively fixed away from the initial position of the grounding brush, the elastic force of the spring on the grounding brush is reduced during the movement of the grounding brush, resulting in poor contact between the grounding brush and the shaft, or even gaps, which affect the normal discharge of shaft voltage, shaft current, and high-frequency harmonic current to the ground. Therefore, we propose a generator shaft current harmonic filtering and shaft voltage precise suppression device. Summary of the Invention

[0005] The purpose of this invention is to provide a device for real-time filtering of generator shaft current harmonics and precise suppression of shaft voltage, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a generator shaft current harmonic filtering and shaft voltage precise suppression device, comprising a mounting cover installed on the front side of the generator, the generator comprising a body and a shaft rotatably connected to the body, the mounting cover being sleeved on the outside of the shaft after installation, the mounting cover being provided with a detection module, a filtering module, an active compensation module, and a control module for assisting in real-time shaft current harmonic filtering and shaft voltage precise suppression, and further comprising: A discharge assembly, located inside the mounting cover, is used to discharge shaft voltage, shaft current and high-frequency harmonic current generated on the shaft to ground. The discharge assembly includes multiple sets of grounding brushes located inside the mounting cover. Each grounding brush is electrically connected to a wire. The sets of grounding brushes are arranged in a ring array on the outside of the shaft and are arranged against each other. A pressure component, located inside the mounting cover, is used to forcefully push the uppermost grounding brush. The mounting cover also contains a spring component for forcefully pushing other groups of grounding brushes. In addition, a drive assembly for maintaining the pressure between the grounding brush and the shaft is provided inside the mounting cover, and a linkage assembly for auxiliary linkage is provided between the pressure assembly and the drive assembly.

[0007] Preferably, the venting assembly includes a first mounting frame and multiple sets of second mounting frames disposed inside the mounting cover. The first mounting frame and multiple sets of second mounting frames are arranged in a circular array on the outer side of the shaft. The first mounting frame is centered above the shaft in the direction of gravity. The grounding brush is mounted on the first mounting frame and multiple sets of second mounting frames, and the first mounting frame and multiple sets of second mounting frames are provided with limiting components for assisting in limiting the grounding brush after installation.

[0008] Preferably, the pressure component includes a mounting base fixed to the first mounting frame, the mounting base being provided with a placement groove, and a gravity block being placed inside the placement groove.

[0009] Preferably, the elastic component includes a connecting plate disposed inside the mounting cover, a sleeve fixedly fixed in the center of the connecting plate facing the second mounting frame, a sliding rod slidably connected to the sleeve, one end of the sliding rod being fixed to the second mounting frame, a compression spring sleeved on the outside of the sleeve, the two ends of the compression spring being respectively abutted against the second mounting frame and the connecting plate, and a guide component for guiding and connecting the mounting base and the connecting plate is disposed inside the mounting cover.

[0010] Preferably, the drive assembly includes a drive ring disposed inside the mounting cover, and a connecting assembly for assisting rotational connection is provided between the drive ring and the mounting cover. The drive ring has multiple sets of second inclined grooves, and second transmission pins are slidably connected to the second inclined grooves. One end of each set of second transmission pins is fixed to each set of connecting plates.

[0011] Preferably, the linkage component includes a first inclined groove formed on the drive ring, a first transmission pin slidably connected to the first inclined groove, and one end of the first transmission pin being fixed to the mounting base.

[0012] Preferably, the connecting assembly includes an annular groove formed inside the mounting cover, a connecting ring rotatably connected inside the annular groove, the connecting ring being sleeved and fixed to the outside of the drive ring, and the mounting cover, the annular groove, the connecting ring and the drive ring being concentrically arranged.

[0013] Preferably, the guide assembly includes fixing blocks fixed to both sides of the mounting base and the connecting plate, and a T-shaped rod is slidably connected to the fixing block, with one end of the T-shaped rod fixed to the inner wall of the mounting cover.

[0014] Preferably, the limiting component includes a U-shaped frame fixed to both sides of the first mounting frame and the second mounting frame. A limiting plate is connected to the U-shaped frame through an extrusion component. One side of the limiting plate is provided with an inclined surface for abutting against the grounding brush for transmission.

[0015] Preferably, the extrusion assembly includes multiple sets of sleeves fixed on a U-shaped frame, with a telescopic rod slidably connected to each sleeve. One end of the telescopic rod is fixed to a limiting plate, and a connecting spring is sleeved on the outer side of each sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are: During operation, the generator of this invention precisely counteracts shaft voltage fluctuations through the cooperation of a detection module, a filtering module, an active compensation module, a control module, and a discharge component. Simultaneously, the grounding brush on the discharge component provides a low-resistance grounding path for the shaft, discharging residual shaft voltage and harmonic current, and stabilizing the shaft potential within a safe range. Furthermore, during the operation of the grounding brush, the cooperation of the pressure component, the elastic component, the drive component, and the linkage component maintains a relatively stable compressive force on the grounding brush throughout its wear process, ensuring good contact between the grounding brush and the shaft, and further guaranteeing the normal discharge of shaft voltage, shaft current, and high-frequency harmonic current to the ground. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram of the inner structure of the mounting cover of the present invention; Figure 3 This is a schematic diagram of the connection component structure of the present invention; Figure 4 This is a schematic diagram showing the positional relationship between the pressure component and each set of elastic components of the present invention; Figure 5 This is a schematic diagram of the pressure component structure of the present invention; Figure 6 This is a schematic diagram of the elastic component structure of the present invention; Figure 7 This is a schematic diagram of the drive component and linkage component structure of the present invention; Figure 8 This is a schematic diagram of the limiting component and the extrusion component of the present invention; Figure 9 This is a schematic diagram showing the pressure component and each set of elastic components of the present invention in use; Figure 10 This is a schematic diagram of the pressure component and each set of elastic components of the present invention during transmission. Figure 11 This is a schematic diagram showing the movement distance of the first mounting frame after the grounding brush of the present invention is worn.

[0018] In the diagram: 101-body; 102-shaft; 103-mounting cover; 201-first mounting frame; 202-second mounting frame; 203-grounding brush; 204-wire; 301-mounting base; 302-placement groove; 303-gravity block; 401-connecting plate; 402-sleeve; 403-slide rod; 404-compression spring; 501-fixing block; 502-T-shaped rod; 601-drive ring; 602-second inclined groove; 603-second transmission pin; 701-first inclined groove; 702-first transmission pin; 801-annular groove; 802-connecting ring; 901-U-shaped frame; 902-limiting plate; 903-inclined surface; 1001-sleeve; 1002-telescopic rod; 1003-connecting spring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention. Example 1

[0020] Please see Figures 1-11The generator shaft current harmonic real-time filtering and shaft voltage precise suppression device shown in the figure includes a mounting cover 103 installed on the front side of the generator. The generator includes a body 101 and a shaft 102 rotatably connected to the body 101. After installation, the mounting cover 103 is sleeved on the outside of the shaft 102. The mounting cover 103 is provided with a detection module, a filtering module, an active compensation module and a control module for assisting in the real-time filtering of shaft current harmonics and precise suppression of shaft voltage. It should be noted that the generator and its body 101 and shaft 102 are conventional technical components in the technical field of this application, and their working principle and control method are well known technologies, so they will not be described in detail here.

[0021] Also includes: The discharge assembly is located inside the mounting cover 103 and is used to discharge the shaft voltage, shaft current and high-frequency harmonic current generated on the shaft body 102 to the ground. The discharge assembly includes multiple sets of grounding brushes 203 located inside the mounting cover 103. The grounding brushes 203 are electrically connected to wires 204. The sets of grounding brushes 203 are arranged in a ring array on the outside of the shaft body 102 and are arranged against each other. A pressure component is provided inside the mounting cover 103 for gravity-driven pushing of the uppermost grounding brush 203. An elastic component is provided inside the mounting cover 103 for elastic-driven pushing of other groups of grounding brushes 203. In addition, a drive assembly is provided inside the mounting cover 103 to maintain the pressure between the grounding brush 203 and the shaft 102, and a linkage assembly for auxiliary linkage is provided between the pressure assembly and the drive assembly. It should be noted that during generator operation, the detection module, filtering module, active compensation module, control module, and discharge component work together to precisely offset shaft voltage fluctuations on the shaft. At the same time, the grounding brush 203 on the discharge component provides a low-resistance grounding path for the shaft, discharging residual shaft voltage and harmonic current, and stabilizing the shaft potential within a safe range. In addition, during the operation of the grounding brush 203, the pressure component, elastic component, drive component, and linkage component work together to maintain a relatively stable compressive force on the grounding brush 203 during wear, ensuring good contact between the grounding brush 203 and the shaft 102, further guaranteeing the normal discharge of shaft voltage, shaft current, and high-frequency harmonic current to the ground. In addition, the detection module, filtering module, active compensation module, control module and grounding brush 203 are conventional technical components in the technical field of this application, and their working principles and control methods are well known technologies, so they will not be described in detail here.

[0022] Preferably, the venting assembly includes a first mounting frame 201 and multiple sets of second mounting frames 202 disposed inside the mounting cover 103. The first mounting frame 201 and multiple sets of second mounting frames 202 are arranged in a circular array on the outer side of the shaft 102. The first mounting frame 201 is centered above the shaft 102 in the direction of gravity. The grounding brush 203 is mounted on the first mounting frame 201 and multiple sets of second mounting frames 202, and the first mounting frame 201 and multiple sets of second mounting frames 202 are provided with limiting components for assisting in limiting the grounding brush 203 after installation. It should be noted here that: the grounding brush 203 on the discharge assembly provides a low-resistance grounding path for the shaft, discharges residual shaft voltage and harmonic current, stabilizes the shaft potential within a safe range, and the modules work together to achieve shaft current harmonic filtering and precise shaft voltage control, avoid bearing erosion, unit vibration and failure shutdown, and ensure stable generator operation.

[0023] Preferably, the pressure component includes a mounting base 301 fixed to the first mounting frame 201, a placement groove 302 provided on the mounting base 301, and a gravity block 303 placed inside the placement groove 302; It should be noted here that: through the gravity of the gravity block 303 placed in the groove 302 on the mounting base 301 and the guiding effect of the guide component on the mounting base 301, the mounting base 301 and the first mounting frame 201 are pushed toward the shaft 102. During the pushing process, one end of the grounding brush 203 installed on the first mounting frame 201 abuts against the shaft 102. And because the gravity of the gravity block 303 remains constant, when the gravity of the gravity block 303 exerts a relatively constant pressure on the grounding brush 203 on the first mounting frame 201, it is ensured that one end of the grounding brush 203 on the first mounting frame 201 abuts against the outside of the shaft 102.

[0024] Preferably, the elastic component includes a connecting plate 401 disposed inside the mounting cover 103. A sleeve 402 is fixedly fixed to the side of the connecting plate 401 facing the second mounting frame 202. A sliding rod 403 is slidably connected to the sleeve 402. One end of the sliding rod 403 is fixed to the second mounting frame 202. A compression spring 404 is sleeved on the outside of the sleeve 402. The two ends of the compression spring 404 are respectively abutted against the second mounting frame 202 and the connecting plate 401. A guide component for guiding and connecting the mounting base 301 and the connecting plate 401 is disposed inside the mounting cover 103. It should be noted here that: through transmission, each group of connecting plates 401 is subjected to force and moves. During the movement of the connecting plates 401, the sliding guidance action of the fixed block 501 and the T-shaped rod 502 on the guide assembly causes the connected plates 401, after being subjected to force, to move towards the outside of the shaft 102. During the movement of the connecting plates 401, the connecting action of the compression spring 404 drives the second mounting frame 202 and the grounding brush 203 on the second mounting frame 202 to move. During the movement, the grounding brush 203 installed on the second mounting frame 202... One end of the ground brush 203 abuts against the outer side of the shaft 102. Through the abutment and limiting effect of the shaft 102 on the ground brush 203 and the second mounting frame 202, and the continued movement of the connecting plate 401, the connecting plate 401 retracts towards the second mounting frame 202. During the retraction movement, the sliding rod 403 is pushed to slide on the sleeve 402 and the compression spring 404 is compressed and deformed to generate elastic force. Through the elastic force of the compression spring 404, the ground brush 203 installed on the second mounting frame 202 is pushed to maintain elastic compression with the outer side of the shaft 102.

[0025] Preferably, the drive assembly includes a drive ring 601 disposed inside the mounting cover 103, and a connecting assembly for assisting rotational connection is provided between the drive ring 601 and the mounting cover 103. The drive ring 601 has multiple sets of second inclined grooves 602, and second transmission pins 603 are slidably connected to the second inclined grooves 602. One end of each set of second transmission pins 603 is fixed to each set of connecting plates 401. It should be noted here that: through the linkage component, the drive ring 601 is subjected to force and moves. During the movement of the drive ring 601, through the rotational connection between the annular groove 801 and the connecting ring 802, the driven ring 601 rotates inside the mounting cover 103 after being subjected to force. During the rotation of the drive ring 601, through the interaction between each group of second inclined grooves 602 and each group of second transmission pins 603, each group of connecting plates 401 is subjected to force and moves. During the movement of the connecting plates 401, through the sliding guidance of the fixed block 501 and the T-shaped rod 502 on the guide component, each group of connecting plates 401 after being subjected to force moves towards the outside of the shaft 102.

[0026] Preferably, the linkage component includes a first inclined groove 701 formed on the drive ring 601, a first transmission pin 702 slidably connected on the first inclined groove 701, and one end of the first transmission pin 702 being fixed to the mounting base 301. It should be noted that during the process of the mounting base 301 moving outward toward the shaft 102 under the action of gravity, the movement of the mounting base 301 drives the first transmission pin 702 to move synchronously. During the movement of the first transmission pin 702, the interaction between the first transmission pin 702 and the first inclined groove 701 causes the drive ring 601 to be subjected to force and move.

[0027] Preferably, the connecting component includes an annular groove 801 formed inside the mounting cover 103, a connecting ring 802 rotatably connected inside the annular groove 801, the connecting ring 802 being sleeved and fixed on the outside of the drive ring 601, and the mounting cover 103, the annular groove 801, the connecting ring 802 and the drive ring 601 being concentrically arranged. It should be noted here that the annular groove 801 and the connecting ring 802 facilitate the rotational connection of the drive ring 601.

[0028] Preferably, the guide assembly includes a fixing block 501 fixed to both sides of the mounting base 301 and the connecting plate 401, and a T-shaped rod 502 slidably connected to the fixing block 501, one end of the T-shaped rod 502 being fixed to the inner wall of the mounting cover 103; It should be noted here that the fixing block 501 and the T-shaped rod 502 facilitate the movement guidance of the mounting base 301 and the connecting plate 401 after the auxiliary force is applied.

[0029] Preferably, the limiting component includes a U-shaped frame 901 fixed to both sides of the first mounting frame 201 and the second mounting frame 202. A limiting plate 902 is connected to the U-shaped frame 901 through a pressing component. One side of the limiting plate 902 is provided with an inclined surface 903 for abutting against the grounding brush 203 for transmission. It should be noted that during the installation of the grounding brush 203 on the first mounting frame 201 and the second mounting frame 202, the grounding brush 203 is pushed towards the first mounting frame 201 or the second mounting frame 202. During the pushing process, the grounding brush 203 abuts against the inclined surfaces 903 of the two sets of limiting plates 902 on the first mounting frame 201 or the second mounting frame 202. During the abutting process, the two sets of limiting plates 902 are subjected to force and move away from each other. During the movement of the limiting plates 902, the telescopic rod 1002 is pushed to slide on the sleeve 1001 and squeezes the connecting spring 1003 to generate elastic force. After pushing the grounding brush 203, the elastic force of the connecting spring 1003 causes the two sets of limiting plates 902 to abut against the two sides of the grounding brush 203 respectively. Through the abutting and squeezing action, the grounding brush 203 is quickly limited and fixed after being pushed into the first mounting frame 201 or the second mounting frame 202.

[0030] Preferably, the extrusion assembly includes multiple sets of sleeves 1001 fixed on the U-shaped frame 901, a telescopic rod 1002 slidably connected to the sleeve 1001, one end of the telescopic rod 1002 being fixed to the limiting plate 902, and a connecting spring 1003 being sleeved on the outer side of the sleeve 1001. It should be noted that: the multiple sets of sleeves 1001 and telescopic rods 1002 facilitate the movement guidance of the limiting plate 902 after being subjected to force, and the connecting spring 1003 facilitates the elastic push of the limiting plate 902 after the contraction movement.

[0031] In this solution, the generator shaft current harmonic filtering and shaft voltage precise suppression device includes the following steps: During generator operation, in order to reduce shaft current harmonics and shaft voltage fluctuations, the mounting cover 103 is installed on the front side of the body 101. During installation, the first mounting frame 201 is centered above the shaft 102 in the direction of gravity. Through the gravity of the gravity block 303 placed in the groove 302 on the mounting base 301 and the guiding effect of the guide component on the mounting base 301, the mounting base 301 and the first mounting frame 201 are pushed towards the shaft 102. During the pushing process, one end of the grounding brush 203 installed on the first mounting frame 201 abuts against the shaft 102. Since the gravity of the gravity block 303 remains constant, the gravity of the gravity block 303 exerts a relatively constant pressure on the grounding brush 203 on the first mounting frame 201, ensuring that one end of the grounding brush 203 on the first mounting frame 201 abuts against the outside of the shaft 102. As the mounting base 301 moves outward toward the shaft 102 under the influence of gravity, the movement of the mounting base 301 drives the first transmission pin 702 to move synchronously. During the movement of the first transmission pin 702, the interaction between the first transmission pin 702 and the first inclined groove 701 causes the drive ring 601 to move under force. During the movement of the drive ring 601, the rotational connection between the annular groove 801 and the connecting ring 802 causes the driven ring 601 to rotate inside the mounting cover 103. During the rotation of the drive ring 601, the interaction between each set of second inclined grooves 602 and each set of second transmission pins 603 causes each set of connecting plates 401 to move under force. During the movement of the connecting plates 401, the sliding guidance between the fixed block 501 and the T-shaped rod 502 on the guide assembly causes the connected plates 401 to converge toward the outside of the shaft 102 (see...). Figure 10During the movement of the connecting plate 401, the compression spring 404 drives the second mounting frame 202 and the grounding brush 203 on the second mounting frame 202 to move. During the movement, one end of the grounding brush 203 mounted on the second mounting frame 202 abuts against the outer side of the shaft 102. Through the limiting action of the shaft 102 on the grounding brush 203 and the second mounting frame 202, and the continued movement of the connecting plate 401, the connecting plate 401 retracts towards the second mounting frame 202. During the contraction movement, the sliding rod 403 slides on the sleeve 402 and the compression spring 404 is compressed and deformed to generate elastic force. Through the elastic force of the compression spring 404, the grounding brush 203 installed on the second mounting frame 202 is pushed to maintain elastic compression with the outside of the shaft 102. Therefore, during the installation of the mounting cover 103, the pressure component and the elastic component can ensure that one end of the grounding brush 203 is compressed against the outside of the shaft 102, which facilitates the subsequent discharge of shaft voltage, shaft current and high-frequency harmonic current. After the installation cover 103 is installed, the detection module, filtering module, active compensation module, control module and discharge component on the installation cover 103 are started. During the operation, the detection module first collects the shaft voltage and shaft current harmonic signals of the generator shaft in real time and transmits the collected signals to the control module. After analyzing and processing the signals, the control module sends control commands to the filtering module and the active compensation module. The filtering module filters out the harmonic components in the shaft current, and the active compensation module outputs a reverse compensation signal to accurately cancel the shaft voltage fluctuation on the shaft. At the same time, the grounding brush 203 on the discharge component provides a low-resistance grounding path for the shaft to discharge the residual shaft voltage and harmonic current, and stabilize the shaft potential within a safe range. The modules work together to achieve shaft current harmonic filtering and precise shaft voltage control, avoid bearing erosion, unit vibration and failure shutdown, and ensure stable generator operation. During the discharge of shaft voltage, shaft current, and high-frequency harmonic current via the grounding brush 203, the grounding brush 203 remains in contact with the outer side of the shaft 102. Due to wear during this contact process and the continuous pushing of the pressure and elastic components, the grounding brush 203 moves (see...). Figure 11During the movement, the gravity of the gravity block 303 causes the mounting base 301 and the first mounting frame 201 to move synchronously with the grounding brush 203. During the movement of the mounting base 301, the linkage component and the drive component drive the connecting plates 401 to move synchronously towards the outside of the shaft 102. The movement of the connecting plates 401 causes the grounding brush 203 to move synchronously during wear, ensuring the relative distance between the connecting plates 401 and the grounding brush 203 on the second mounting frame 202. By maintaining the abutting distance, the deformation of the compression spring 404 between the connecting plates 401 and the second mounting frame 202 changes less. During the wear of the grounding brush 203, a relatively stable compressive force is always maintained on the grounding brush 203, resulting in a good abutting effect between the grounding brush 203 and the shaft 102. This further ensures the normal discharge of shaft voltage, shaft current and high-frequency harmonic current to the ground. In addition, during the installation of the grounding brush 203 on the first mounting frame 201 and the second mounting frame 202, the grounding brush 203 is pushed toward the first mounting frame 201 or the second mounting frame 202. During the pushing process, the grounding brush 203 abuts against the inclined surfaces 903 of the two sets of limiting plates 902 on the first mounting frame 201 or the second mounting frame 202. During the abutting process, the two sets of limiting plates 902 are subjected to force and move away from each other. During the movement of the limiting plates 902, the telescopic rod 1002 is pushed to slide on the sleeve 1001 and squeezes the connecting spring 1003 to generate elastic force. After pushing the grounding brush 203, the elastic force of the connecting spring 1003 causes the two sets of limiting plates 902 to abut against the two sides of the grounding brush 203 respectively. Through the abutting and squeezing action, the grounding brush 203 is quickly limited and fixed after being pushed into the first mounting frame 201 or the second mounting frame 202.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A generator shaft current harmonic filtering and shaft voltage precise suppression device, including: The mounting cover (103) is installed on the front side of the generator. The generator includes a body (101) and a shaft (102) rotatably connected to the body (101). After installation, the mounting cover (103) is sleeved on the outside of the shaft (102). The mounting cover (103) is provided with a detection module, a filtering module, an active compensation module and a control module for assisting in real-time filtering of shaft current harmonics and precise suppression of shaft voltage. Its characteristic is that it further includes: A discharge assembly is disposed inside the mounting cover (103) for discharging shaft voltage, shaft current and high-frequency harmonic current generated on the shaft body (102) to ground. The discharge assembly includes multiple sets of grounding brushes (203) disposed inside the mounting cover (103). The grounding brushes (203) are electrically connected to wires (204). Each set of grounding brushes (203) is arranged in a ring array on the outside of the shaft body (102) and is arranged against each other. A pressure component is provided inside the mounting cover (103) for gravity-driven pushing of the uppermost grounding brush (203), and the mounting cover (103) is provided inside a spring component for elastically pushing other groups of grounding brushes (203); In addition, a drive assembly for maintaining the pressure between the grounding brush (203) and the shaft (102) is provided inside the mounting cover (103), and a linkage assembly for assisting linkage is provided between the pressure assembly and the drive assembly.

2. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 1, characterized in that: The discharge assembly includes a first mounting frame (201) and multiple sets of second mounting frames (202) disposed inside the mounting cover (103). The first mounting frame (201) and multiple sets of second mounting frames (202) are arranged in a circular array on the outside of the shaft (102). The first mounting frame (201) is centered above the shaft (102) in the direction of gravity. The grounding brush (203) is mounted on the first mounting frame (201) and multiple sets of second mounting frames (202), and the first mounting frame (201) and multiple sets of second mounting frames (202) are provided with limiting components for assisting in limiting the grounding brush (203) after installation.

3. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 2, characterized in that: The pressure component includes a mounting base (301) fixed on the first mounting frame (201), the mounting base (301) is provided with a placement groove (302), and a gravity block (303) is placed inside the placement groove (302).

4. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 3, characterized in that: The elastic component includes a connecting plate (401) disposed inside the mounting cover (103). A sleeve (402) is fixedly fixed to the side of the connecting plate (401) facing the second mounting frame (202). A slide rod (403) is slidably connected to the sleeve (402). One end of the slide rod (403) is fixed to the second mounting frame (202). A compression spring (404) is sleeved on the outside of the sleeve (402). The two ends of the compression spring (404) are respectively abutted against the second mounting frame (202) and the connecting plate (401). A guide component for guiding and connecting the mounting base (301) and the connecting plate (401) is disposed inside the mounting cover (103).

5. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 4, characterized in that: The drive assembly includes a drive ring (601) disposed inside the mounting cover (103). A connecting assembly for assisting rotational connection is provided between the drive ring (601) and the mounting cover (103). Multiple sets of second inclined grooves (602) are provided on the drive ring (601). Second transmission pins (603) are slidably connected to the second inclined grooves (602). One end of each set of second transmission pins (603) is fixed to each set of connecting plates (401).

6. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 5, characterized in that: The linkage component includes a first inclined groove (701) formed on the drive ring (601), a first transmission pin (702) is slidably connected on the first inclined groove (701), and one end of the first transmission pin (702) is fixed to the mounting base (301).

7. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 5, characterized in that: The connecting assembly includes an annular groove (801) opened inside the mounting cover (103), and a connecting ring (802) is rotatably connected inside the annular groove (801). The connecting ring (802) is sleeved and fixed on the outside of the drive ring (601), and the mounting cover (103), the annular groove (801), the connecting ring (802) and the drive ring (601) are concentrically arranged.

8. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 4, characterized in that: The guide assembly includes a fixing block (501) fixed to both sides of the mounting base (301) and the connecting plate (401). A T-shaped rod (502) is slidably connected to the fixing block (501), and one end of the T-shaped rod (502) is fixed to the inner wall of the mounting cover (103).

9. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 2, characterized in that: The limiting component includes a U-shaped frame (901) fixed to both sides of the first mounting frame (201) and the second mounting frame (202). A limiting plate (902) is connected to the U-shaped frame (901) through an extrusion component. A slope (903) is provided on one side of the limiting plate (902) for abutting and driving against the grounding brush (203).

10. The generator shaft current harmonic filtering and shaft voltage precise suppression device according to claim 9, characterized in that: The extrusion assembly includes multiple sets of sleeves (1001) fixed on a U-shaped frame (901). A telescopic rod (1002) is slidably connected to the sleeve (1001). One end of the telescopic rod (1002) is fixed to a limiting plate (902). A connecting spring (1003) is sleeved on the outside of the sleeve (1001).

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