A knife contact self-cleaning type outdoor high-voltage disconnector

Abstract

The application discloses a kind of outdoor high-voltage disconnectors of knife gap contact self-cleaning, it is related to high-voltage electrical apparatus technical field, to solve the technical problem that existing disconnectors lack online self-cleaning capability, including static contact unit, moving contact unit, contact cleaning mechanism, contact cleaning mechanism includes wrapping scraping component and vibration scraping component, wherein, wrapping scraping component is by the flexible hinged structure of chain plate module and elastic energy storage reset mechanism, realizes wrapping extrusion scraping and reciprocating cleaning to upper surface and side surface in the process of opening and closing, effectively removes oxide film and arc ablation product;Vibration scraping component then utilizes the oblique guide of scraping strip and the synergistic effect of wave groove vibration excitation, form stable scraping and vibration breaking combination cleaning effect on conductive surface, and long-term use reliability is guaranteed by means of oblique chip removal and reset function.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical technology, and more specifically, to an outdoor high-voltage disconnect switch with self-cleaning knife switch contacts. Background Technology

[0002] Outdoor high-voltage disconnect switches are exposed to the atmosphere for extended periods, making their static conductive contact surfaces highly susceptible to corrosion from industrial dust, salt spray, and humid air, resulting in a high-resistivity oxide layer. Simultaneously, during opening and closing operations, the electric arc generated between the contacts causes ablation of the conductive surfaces, producing metal oxides and carbide products. These oxide films, arc erosion products, and accumulated contaminants adhere to the surface of the static conductive contacts, significantly increasing contact resistance and causing localized overheating. In severe cases, this can even lead to the burnout of the entire disconnect switch assembly. Traditional disconnect switches lack effective online cleaning methods and typically rely on periodic manual power outages for maintenance. This is not only time-consuming and labor-intensive with high maintenance costs, but also makes it difficult to guarantee the cleanliness of the contact surfaces before each operation, failing to meet the power system's requirements for high equipment reliability and maintenance-free operation.

[0003] In existing technologies, some disconnecting switches attempt to incorporate scraping structures on the moving contacts, but most only allow for simple, one-way scraping of the conductive surface, resulting in limited cleaning coverage and difficulty in simultaneously addressing the comprehensive cleaning needs of the conductive surface, top surface, and sides. Furthermore, the scraping structures are often rigidly arranged, unable to adapt to changes in the contact surface contour or transition areas between different surfaces, leading to uneven and incomplete scraping. In addition, conventional scraping methods are ineffective at removing stubborn oxide films, and the debris generated during scraping easily accumulates at the scraping interface, exacerbating poor contact or accelerating contact wear, failing to fundamentally solve the problem of increased contact resistance caused by contact surface contamination. Therefore, we propose a self-cleaning outdoor high-voltage disconnecting switch for knife switch contacts. Summary of the Invention

[0004] The purpose of this invention is to provide an outdoor high-voltage disconnect switch with self-cleaning knife switch contacts to solve the technical problem that existing disconnect switches lack online self-cleaning capabilities.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a self-cleaning outdoor high-voltage disconnect switch with knife switch contacts, comprising: A stationary contact unit, comprising a plate-shaped stationary conductive contact; The moving contact unit includes two plate-shaped contacts arranged in parallel and spaced apart, with a clamping gap formed between the two plate-shaped contacts for clamping the stationary conductive contact; A power transmission unit, connected to the moving contact unit, is used to drive the moving contact unit to move relative to the stationary contact unit in order to realize opening and closing of the circuit breaker; A contact cleaning mechanism, located between the two plate-shaped contacts, includes a wrapping scraping component and a vibrating scraping component; The wrapping and scraping assembly includes two sets of chain plate modules with their ends hinged to each other; the chain plate modules can wrap the upper surface and side surface of the static conductive contact during both the opening and closing strokes, and slide relative to it to scrape it off. The vibration scraping assembly is disposed on the inner side of at least one of the plate-shaped contacts and includes at least one scraper; the scraper is configured to slide in contact with the conductive surface of the stationary conductive contact during the opening and closing strokes to scrape, and to generate vibration perpendicular to the conductive surface of the stationary conductive contact during the sliding process.

[0006] Preferably, the chain plate module is composed of multiple connecting plates connected sequentially by a hinge structure. The connecting plates are provided with a scraping surface, and the scraping surface is provided with a conical scraping structure for guiding the scraped material to both sides of the connecting plate for discharge.

[0007] Preferably, the hinge structure includes a stop plate disposed on one of the connecting plates, a fixing groove disposed on the other connecting plate, and a semi-cylindrical hinge shaft axially sleeved on the stop plate; hinge holes are provided on both sides of the fixing groove, and the hinge shaft passes through the hinge shaft, causing the end of the stop plate to abut against the fixing groove, thereby limiting the relative rotation angle of adjacent connecting plates; a sector-shaped body is also sleeved inside the hinge hole, and one side of the sector-shaped body abuts against the hinge shaft, so that the two adjacent connecting plates can rotate in one direction.

[0008] Preferably, the package scraping assembly further includes an elastic reset structure that provides elastic force to the chain plate module. The elastic reset structure includes an arc-shaped rod inserted into two adjacent connecting plates. A first stop block is arranged in the middle of each arc-shaped rod. A first tension spring is arranged on each arc-shaped rod and on both sides of the first stop block. The first tension spring is elastically adapted to the connecting plate and is used to drive the chain plate module to close.

[0009] Preferably, the package scraping assembly further includes an elastic retaining structure, the elastic retaining structure comprising: A rotating shaft passes through the plate-shaped contact and is fixedly connected to the end of the chain plate module; A fan-shaped abutment is fixed on the rotating shaft; A transmission cap is fitted over the outside of the rotating shaft and fixedly connected to one side of the plate-shaped contact. The stop block is fixed inside the transmission cap and abuts against the fan-shaped stop block; A torsion spring is sleeved inside the transmission cap, and its end is fixedly connected to the surface of the rotating shaft.

[0010] Preferably, the vibratory scraping assembly includes multiple scraper blades; the scraper blades are arranged at an angle, with the angle forming an acute angle with the sliding direction, so as to continuously push and guide the scraped material along the angled direction and discharge it; the scraper blades are provided with guide grooves; a limit button is fixed on the plate-shaped contact head, and the limit button slides within the guide groove; a limit block is fixedly connected between two adjacent scraper blades, and the two limit blocks abut against each other to realize the linkage displacement of the multiple scraper blades.

[0011] Preferably, the guide groove is composed of alternating straight grooves and wavy grooves. When the limiting button slides in the wavy groove, the scraper generates a reciprocating micro-displacement perpendicular to the conductive surface.

[0012] Preferably, the vibration scraping assembly further includes a second tension spring, one end of which is connected to the scraper and the other end of which is connected to the plate-shaped contact, for driving the scraper to reset.

[0013] Preferably, it further includes a bearing insulation unit, which includes a base, a stationary contact post insulator, a transmission contact post insulator, and a rotary support insulator fixed on the base; the stationary contact unit is fixed to the end of the stationary contact post insulator; and the moving contact unit is hinged to the ends of the transmission contact post insulator and the rotary support insulator, respectively.

[0014] Preferably, the power transmission unit includes a drive shaft movably connected to the base, an operating crank arm fixed to the end of the drive shaft, and an insulating pull rod for connecting the operating crank arm and the moving contact unit.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates a wrapping scraping component and a vibration scraping component on the same plate-shaped contact, constructing a comprehensive, bidirectional self-cleaning system covering the upper surface, sides, and conductive surfaces of the static conductive contact. The wrapping scraping component, utilizing the flexible hinge structure and elastic energy storage and reset mechanism of the chain plate module, achieves wrapping, squeezing, and reciprocating cleaning of the upper and sides during opening and closing, effectively removing oxide films and arc erosion products. The vibration scraping component, through the synergistic effect of the inclined guide of the scraper and the vibration excitation of the corrugated groove, forms a stable cleaning effect combining scraping and vibration breaking on the conductive surface, and ensures long-term reliability through inclined chip removal and reset functions. Working together, both components fully utilize the opening and closing stroke of the disconnector switch itself, automatically completing bidirectional cleaning of multiple surfaces of the static conductive contact in each operation without an external power source. This effectively prevents increased contact resistance, significantly improves the electrical contact performance, operational stability, and service life of the disconnector switch, and has outstanding advantages such as compact structure, reliable operation, and long maintenance-free cycle.

[0016] 2. The wrapping and scraping assembly of the present invention, through the hinged adaptation and flexible bending capability of two sets of chain plate modules, can closely fit the upper surface and side contours of the static conductive contact, achieving effective scraping in both the opening and closing bidirectional strokes. Its conical scraping structure guides the scraped material to both sides during the scraping process to avoid accumulation. Combined with the continuous positive pressure provided by the first tension spring and the elastic reset effect of the torsion spring, it ensures that the chain plate module quickly opens to wrap the contact surface when opening, is stretched open to store energy when closing, and releases elastic potential energy for secondary scraping when opening again. This achieves bidirectional, reciprocating cleaning of the upper surface and sides, effectively removing oxide film, arc erosion products and dirt, and preventing abnormal increase in contact resistance.

[0017] 3. The vibration scraping assembly of the present invention, through the inclined arrangement of the scraper and the cooperation of the guide groove and the limiting button, allows the scraper to experience stable scraping of the straight groove section and vibration excitation of the wavy groove section in sequence as the scraper slides with the plate-shaped contact, generating a reciprocating micro-movement displacement perpendicular to the conductive surface, forming a vibration scraping effect, which significantly enhances the ability to remove stubborn oxide films; at the same time, the inclined edge of the scraper continuously guides the scraped material to be discharged, and the slight shaking caused by the wavy groove section further disrupts the adhesion state of the scraped material, assists in chip removal, and avoids accumulation. With the reset function of the second tension spring, the scraper returns to its position after each scraping stroke, ensuring the cleaning effect of the conductive surface and the stability and reliability of the closing contact during long-term use. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the contact cleaning mechanism of the present invention.

[0020] Figure 3 This is a three-dimensional partial structural diagram of the wrapping scraping component of the present invention.

[0021] Figure 4 This is a cross-sectional structural diagram of the package scraping component of the present invention.

[0022] Figure 5 This is a three-dimensional exploded view of the package scraping component of the present invention.

[0023] Figure 6 This is a cross-sectional structural diagram of the package scraping component of the present invention in its usage state.

[0024] Figure 7 This is a three-dimensional structural diagram of the vibration scraping assembly of the present invention.

[0025] Figure 8 This is a three-dimensional enlarged structural diagram of the scraper of the present invention.

[0026] Figure 9This is a cross-sectional schematic diagram of the three-dimensional structure of the limiting plate of the present invention.

[0027] Figure 10 This is a schematic diagram of the scraper blade in use according to the present invention.

[0028] The following are the labeling instructions in the diagram: 1. Base; 2. Conductive switch assembly; 21. Stationary contact post insulator; 211. Conductive contact; 22. Transmission contact post insulator; 23. Rotary support insulator; 24. Plate-shaped contact; 3. Contact cleaning mechanism; 31. Wrapping and scraping assembly; 311. Connecting plate; 312. Sector-shaped body; 313. Hinge shaft; 314. Abutment plate; 315. Fixing groove; 316. Arc-shaped rod; 317. First tension spring; 318. Rotating shaft; 319. Sector-shaped abutment block; 3110. Transmission cap; 3111. Block; 3112. Torsion spring; 32. Vibration scraping assembly; 321. Assembly groove; 322. Scraper strip; 3221. Guide groove; 3222. Limiting block; 323. Support frame; 324. Limiting plate; 325. Limiting button block; 326. Second tension spring. Detailed Implementation

[0029] like Figures 1-2 As shown, the present invention relates to a self-cleaning outdoor high-voltage disconnect switch for knife switch contacts, comprising a base 1, multiple sets of conductive knife switch groups 2 arranged on the base 1, a contact cleaning mechanism 3 arranged on the conductive knife switch groups 2, and a power transmission unit arranged on the base 1 and drivenly connected to the conductive knife switch groups 2.

[0030] Specifically, the power transmission unit includes a drive shaft, an operating crank arm fixedly connected to the end of the drive shaft, and an insulating pull rod for connecting the operating crank arm and the moving contact unit; in this embodiment, a mounting hole is opened at each end of the base 1, the drive shaft is transversely inserted through the two mounting holes of the base 1, and a drive mechanism is externally connected to one end of the drive shaft to transmit the opening and closing torque.

[0031] Multiple sets of conductive knife switch assemblies 2 are arranged equidistantly along the length of the base frame. Specifically, each conductive knife switch assembly 2 includes a stationary contact post insulator 21, a transmission contact post insulator 22, a rotary support insulator 23, and two parallel, spaced-apart plate-shaped contacts 24. The rotary support insulator 23 is hinged to the plate-shaped contacts 24, with a crank arm hinged to the end of the rotary support insulator 23. A conductive contact 211 is arranged at the end of the stationary contact post insulator 21, and the plate-shaped contacts 24 and 211 form an insertion fit when the switch is closed. Specifically, a rotating seat is installed at the top of the rotary support insulator 23, and one end of the plate-shaped contact 24 is hinged to the rotating seat, allowing the plate-shaped contact 24 to swing up and down around the hinge point. The crank arm is hinged to the middle of the plate-shaped contact 24 or near the hinge end via an insulating rod. When the transmission shaft rotates, the crank arm drives the plate-shaped contact 24 to swing up and down around the rotating seat via the insulating rod, achieving the opening or closing action.

[0032] It is worth noting that the static conductive contact 211 has a plate-like structure, and the direction of its plate surface is perpendicular to or at a preset angle to the swing plane of the plate-like contact 24; a clamping gap is formed between the two plate-like contacts 24, and the contact cleaning mechanism 3 is located between the two plate-like contacts 24; the thickness of the conductive contact 211 is adapted to the clamping gap; when the circuit is closed, the plate-like contact 24 swings downward, and the static conductive contact 211 is inserted into the clamping gap between the two plate-like contacts 24, and the two plate-like contacts 24 clamp the conductive contact 211 to form surface contact conductivity.

[0033] like Figures 1-2 As shown, the contact cleaning mechanism 3 includes a set of wrapping and scraping components 31 and a set of vibration and scraping components 32. The wrapping and scraping components 31 scrape the upper surface of the static conductive contact 211 and the side near the drive contact post insulator 22 to prevent the contact resistance from abnormally increasing when the static conductive contact 211 separates from the plate contact 24 due to residual oxide film, arc erosion products or accumulated dirt adhering to the surface of the static conductive contact 211. The vibration and scraping components 32 scrape the conductive surface of the static conductive contact 211 to remove the oxide layer and dirt formed on the conductive surface due to long-term current flow or environmental erosion, ensuring that a reliable low-resistance surface contact is formed between the plate contact 24 and the static conductive contact 211 when the circuit is closed.

[0034] Combination Figures 3-6 As shown, in this embodiment, the wrapping scraping assembly 31 includes two sets of chain plate modules. The ends of the two sets of chain plate modules are hinged together, and the two sets of chain plate modules are completely identical in structure and function. Therefore, any one of the chain plate modules will be described as follows: Each connecting plate 311 has a scraping surface on one side, and the scraping surface has a conical scraping structure. The conical scraping structure has a guiding function, which can guide the scraped material (such as oxide film debris, dirt particles, etc.) generated during the scraping process to both sides of the connecting plate 311 for discharge, so as to avoid the scraped material from accumulating between the scraping surface and the surface of the static conductive contact 211, thereby ensuring the continuous effectiveness of the scraping effect. Several connecting plates 311 can rotate relative to each other through the hinge structure. The chain plate module as a whole has flexible bending capability to adapt to the transition area and contour changes between different surfaces of the static conductive contact 211, ensuring that the scraping surface always remains in contact with the surface of the static conductive contact 211.

[0035] Firstly, the hinge structure of several connecting plates 311 has hinge holes or hinge shafts 313. The hinge shaft 313 is semi-circular, and a sector-shaped body 312 is sleeved inside the hinge hole. One side of the sector-shaped body 312 abuts against the hinge shaft 313. When two adjacent connecting plates 311 rotate, the sector-shaped body 312 abuts against the hinge shaft 313, so that the adjacent connecting plates 311 can only rotate in one direction. Except for one end connecting plate 311, the ends of the other connecting plates 311 are fixedly connected to abutment plates 314. Except for the other end connecting plate 311, the other connecting plates 311 have a fixing groove 315 on one side. The end of the abutment plate 314 abuts against the inner wall of one side of the fixing groove 315. Through the abutment cooperation between the abutment plate 314 and the fixing groove 315, the relative rotation angle of two adjacent connecting plates 311 is limited, preventing the chain plate module from bending excessively in the reverse direction and losing its ability to adhere to the surface of the static conductive contact 211.

[0036] Secondly, in the two sets of chain plate modules, the connecting plates 311 of adjacent pairs are hinged and adapted, and several arc-shaped rods 316 are inserted into the two adjacent connecting plates 311. Each arc-shaped rod 316 has a first abutment block arranged at the middle position of the rod body. On each arc-shaped rod 316, a first tension spring 317 is arranged on both sides of the first abutment block, and the first tension spring 317 is elastically adapted to the connecting plate 311. When the two sets of chain plate modules are closed, an angle is formed between the two chain plate modules. When the circuit is opened, the two chain plate modules can quickly open and wrap around the surface of the static conductive contact 211, and scrape the upper surface and the side near the transmission contact post insulator 22. During the closing process, the first tension spring 317 applies an elastic force to the connecting plate 311, so that the connecting plate 311 applies a continuous positive pressure to the scraping surface of the static conductive contact 211, thereby increasing the scraping effect.

[0037] Thirdly, in the chain plate module located within the plate-shaped contact 24, one of the connecting plates 311 is hinged between the two plate-shaped contacts 24 via a rotating shaft 318, and the rotating shaft 318 passes through the two plate-shaped contacts 24. A sector-shaped stop block 319 is fixedly connected to the side surface of the rotating shaft 318. A transmission cap 3110 is fixedly connected to one side of one of the plate-shaped contacts 24, and the sector-shaped stop block 319 is rotatably sleeved inside the transmission cap 3110. A blocking block 3111 is sleeved inside the transmission cap 3110, and the blocking block 3111 and the sector-shaped stop block 319 are connected to each other. The abutment block 319 abuts against the transmission cap 3110, which is internally fitted with a torsion spring 3112, and the end of the torsion spring 3112 is fixedly connected to the surface of the rotating shaft 318. Through the abutment cooperation between the fan-shaped abutment block 319 and the blocking block 3111 and the elastic constraint of the torsion spring 3112, the rotation angle of the chain plate module between the two plate-shaped contacts 24 is limited, so as to avoid the chain plate module from rotating too much and causing the two sets of chain plate modules to fail to open, and to ensure that the wrapping scraping component 31 can reliably open and wrap the surface of the static conductive contact 211 when the switch is opened.

[0038] Specifically, when the plate-shaped contact 24 is in the open state, the two sets of chain plate modules open relative to each other under the elastic reset action of the torsion spring 3112, wrapping around the upper surface of the stationary conductive contact 211 and the side near the drive contact support insulator 22; when the plate-shaped contact 24 swings in the closing direction, the chain plate modules move with the plate-shaped contact 24, and the scraping surface slides relative to the surface of the stationary conductive contact 211. The conical scraping structure squeezes and scrapes the surface of the stationary conductive contact 211, and the scraped material is scraped along the conical surface. The surface is guided for discharge; when the plate contact 24 is fully closed, the two sets of chain plate modules are opened by the blocking action of the static conductive contact 211, and the first tension spring 317 is stretched and stored to store elastic potential energy for the rapid opening and scraping action during the next opening; when the plate contact 24 opens again, the first tension spring 317 releases elastic potential energy, pulls the two sets of chain plate modules to close and reset quickly, and scrapes the surface of the static conductive contact 211 again during the reset process, realizing bidirectional cleaning of opening and closing.

[0039] The wrapping and scraping assembly 31 of the present invention, through the hinged adaptation and flexible bending capability of two sets of chain plate modules, can closely fit the upper surface and side contour of the static conductive contact 211, and effectively scrape during both opening and closing strokes. Its conical scraping structure guides the scraped material to both sides during the scraping process to avoid accumulation. Combined with the continuous positive pressure provided by the first tension spring 317 and the elastic reset effect of the torsion spring 3112, it ensures that the chain plate module quickly opens to wrap the contact surface when opening, is stretched open to store energy when closing, and releases elastic potential energy for secondary scraping when opening again. This achieves bidirectional, reciprocating cleaning of the upper surface and sides, effectively removing oxide film, arc erosion products and dirt, and preventing abnormal increase in contact resistance.

[0040] Combination Figures 7-10 As shown, in this embodiment, the plate-shaped contact 24 of this embodiment has an assembly groove 321 on the inner side facing the clamping gap. A plurality of scraper strips 322 are arranged in a linear array inside the assembly groove 321, and the scraper strips 322 are inclined. The inclination direction of the scraper strips 322 forms an acute angle with the sliding direction of the scraper strips 322, so that the scraped material can be continuously discharged along the inclined edge during the scraping process. Each scraper 322 has guide grooves 3221 on both sides. The guide grooves 3221 are composed of a straight groove and a wave groove. The straight groove and the wave groove are connected alternately in sequence, so that the scraper 322 experiences a smooth scraping section and a vibration excitation section in sequence during the sliding process. Each pair of adjacent scraper blades 322 is fixedly connected to a limiting block 3222, and the two limiting blocks 3222 abut against each other. The abutting cooperation of the limiting blocks 3222 limits the distance between the two adjacent scraper blades 322. The abutting of the two limiting blocks 3222 causes the movement of one of the two adjacent scraper blades 322 to drive the movement of the other scraper blade 322, realizing the linkage displacement of multiple scraper blades 322 and ensuring that the stroke of each scraper blade 322 is consistent during the scraping process. The inner walls on both sides of the assembly groove 321 are hinged with several support frames 323 in a linear array, and the scraper 322 is slidably adapted between two opposite support frames 323. The support frames 323 are used to provide sliding support and guidance for the scraper 322, and constrain the scraper 322 to move only along the trajectory defined by the guide groove 3221. Two limiting plates 324 are fixedly connected to one side of the plate-shaped contact 24 at the edge of the assembly groove 321, and several scraper strips 322 are slidably adapted between the two limiting plates 324. The limiting plates 324 are used to constrain the lateral movement of the scraper strips 322 and ensure that the scraper strips 322 do not deviate in the width direction. Limiting buttons 325 are fixedly connected in a linear array on one side of the inner wall of each limiting plate 324, and the limiting buttons 325 are slidably adapted inside the guide groove 3221. The limiting buttons 325 and the guide groove 3221 cooperate to form a motion constraint pair for the scraper strips 322. A second tension spring 326 is fixedly connected to one side of each limiting plate 324, and the end of the second tension spring 326 is elastically connected to one end of the scraper strip 322. It is used to provide a reset pull after the scraper strip 322 completes the scraping stroke, so that the scraper strip 322 returns to the initial position and prepares for the next scraping action. Specifically, when the plate-shaped contact 24 closes or opens, the scraper 322 moves with the plate-shaped contact 24. The inclined edge of the scraper 322 makes sliding scraping contact with the conductive surface of the stationary conductive contact 211, scraping off the oxide layer and dirt on the conductive surface. During the process of the scraper 322 contacting and sliding relative to the stationary conductive contact 211, the scraper 322 is subjected to frictional resistance from the surface of the stationary conductive contact 211, causing the scraper 322 to slide relative to the limit button 325 along the guide groove 3221. When the limit button 325 slides to the wavy groove section of the guide groove 3221, the scraper 322 generates a reciprocating micro-displacement perpendicular to the conductive surface, causing intermittent pressure between the scraper 322 and the surface of the stationary conductive contact 211. The force change creates a vibratory scraping effect to enhance the ability to remove stubborn oxide films. When the limit button 325 is in the straight groove section, the scraper 322 maintains a stable scraping posture to ensure uniform coverage of the conductive surface. At the same time, the inclined arrangement of the scraper 322 and the sliding of the scraper 322, along with the sliding of the limit button 325 in the guide groove 3221 and its movement to the wave groove, cause the scraper 322 to shake slightly. Together, these actions continuously push and guide the scraped material along the inclined direction to discharge it. This shaking further disrupts the adhesion of the scraped material to the edge of the scraper 322, assisting in chip removal and preventing the scraped material from accumulating between the scraper 322 and the conductive surface, thereby maintaining the continuity of the scraping effect and the reliability of the conductive contact.

[0041] The vibration scraping assembly 32 of the present invention, through the inclined arrangement of the scraper 322 and the cooperation between the guide groove 3221 and the limiting button 325, allows the scraper 322 to undergo stable scraping of the straight groove section and vibration excitation of the wavy groove section in sequence as it slides with the plate-shaped contact 24. This generates a reciprocating micro-movement perpendicular to the conductive surface, forming a vibration scraping effect, which significantly enhances the ability to remove stubborn oxide films. At the same time, the inclined edge of the scraper 322 continuously guides the scraped material out, and the slight shaking caused by the wavy groove section further disrupts the adhesion of the scraped material, assisting in chip removal and preventing accumulation. With the reset function of the second tension spring 326, the scraper 322 returns to its original position after each scraping stroke, ensuring the cleaning effect of the conductive surface and the stability and reliability of the closing contact during long-term use.

[0042] Working Principle: This embodiment provides a self-cleaning outdoor high-voltage disconnect switch for knife switch contacts. During the closing process: an external drive mechanism drives the operating crank arm to rotate via a transmission shaft. The operating crank arm, through an insulating pull rod, causes the plate-shaped contact 24 to swing downwards around the rotating seat at the top of the rotating support insulator 23. During this process, the plate-shaped contact 24 gradually approaches the stationary conductive contact 211. First, the scraper strips 322 in the two sets of vibration scraping assemblies 32 inside the plate-shaped contact 24 first contact the conductive surface of the stationary conductive contact 211. Under the action of frictional resistance, the scraper strips 322 slide along the guide groove 3221 relative to the limit button 325, sequentially passing through the stable scraping of the straight groove section and the vibration excitation of the wave groove section, scraping away the conductive surface and removing the oxide layer and dirt. Simultaneously, the two sets of chain plate modules wrapping the scraping assembly 31 remain open under the elastic action of the torsion spring 3112, wrapping around the stationary conductive contact. On the upper surface of the electrical contact 211 and the side near the insulator 22 of the transmission contact post, as the chain plate module moves downward with the plate-shaped contact 24, its conical scraping structure slides relative to the surface of the static conductive contact 211, squeezing and scraping the upper surface and side. The scraped material is guided and discharged along the conical surface. When the plate-shaped contact 24 is fully closed, the static conductive contact 211 is fully inserted into the clamping gap of the two plate-shaped contacts 24, and the two sets of plate-shaped contacts 24 clamp the conductive contact 211 to form surface contact conductivity. The two sets of chain plate modules are pushed open by the blocking action of the static conductive contact 211, and at the same time, their surfaces are also scraped. The first tension spring 317 is stretched and stored to store elastic potential energy for the rapid closing scraping during the next opening. At the same time, after the scraping stroke is completed, the scraper 322 of the vibration scraping assembly 32 is pulled back by the second tension spring 326 to prepare for the next action.

[0043] During the opening process: the external drive mechanism reverses the drive shaft, and the operating crank arm drives the plate-shaped contact 24 to swing upward around the rotating seat via the insulating pull rod. The plate-shaped contact 24 gradually separates from the stationary conductive contact 211. During this process, the first tension spring 317 of the scraping assembly 31 releases the elastic potential energy stored during closing, pulling the two sets of chain plate modules to quickly close and reset. During the reset process, the chain plate modules slide relative to the upper surface and side of the stationary conductive contact 211 again, and the conical scraping structure scrapes its surface again to remove the arc erosion products and attached dirt that may be generated during the closing and current flow. At the same time, the torsion spring 3112 passes through... The cooperation between the fan-shaped stop block 319 and the stop block 3111 constrains the rotation angle of the chain plate module, ensuring that it will not rotate excessively and fail. At the same time, the scraper 322 of the vibration scraping component 32 moves upward with the plate-shaped contact 24, and its inclined edge slides and scrapes against the conductive surface of the static conductive contact 211 again. Under the action of frictional resistance, it undergoes alternating sliding between the straight groove section and the wave groove section, forming a secondary cleaning that combines stable scraping and vibration excitation, further removing the residue on the conductive surface. The wrapping scraping component 31 performs scraping action again during the opening process, thereby achieving bidirectional cleaning of the static conductive contact 211.

[0044] Reset and Standby State: After the circuit breaker is opened, the chain plate module of the scraping component 31 remains open and in standby state under the elastic constraint of the torsion spring 3112. The included angle between the two sets of chain plate modules is opened to the preset position, ready to wrap the surface of the static conductive contact 211 when the circuit breaker is closed again. The scraper 322 of the vibration scraping component 32 returns to the initial position under the tension of the second tension spring 326. The limit button 325 is located at the beginning of the straight groove of the guide groove 3221. The entire contact cleaning mechanism 3 is in standby state. When the disconnecting switch performs the closing operation again, the above closing process will be triggered again. The scraper 322 and the chain plate module perform a new round of cleaning action on the conductive surface, the upper surface and the side, respectively. In this way, the present invention makes full use of the disconnecting switch's own opening and closing action stroke, without the need for an external power source. It automatically completes bidirectional cleaning of multiple surfaces of the static conductive contact 211 in each closing and opening operation, ensuring the cleanliness of the contact surface and the reliability of conductivity during long-term use.

[0045] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A self-cleaning outdoor high-voltage disconnect switch with knife switch contacts, characterized in that, include: The stationary contact unit includes a plate-shaped stationary conductive contact (211). The moving contact unit includes two plate-shaped contacts (24) arranged in parallel and spaced apart, with a clamping gap formed between the two plate-shaped contacts (24) for clamping the static conductive contact (211); A power transmission unit, connected to the moving contact unit, is used to drive the moving contact unit to move relative to the stationary contact unit in order to realize opening and closing of the circuit breaker; The contact cleaning mechanism (3) is located between the two plate-shaped contacts (24) and includes a wrapping scraping assembly (31) and a vibrating scraping assembly (32). The wrapping and scraping assembly (31) includes two sets of chain plate modules with their ends hinged to each other; the chain plate modules can wrap the upper surface and side surface of the static conductive contact (211) during both the opening and closing strokes, and slide relative to it to scrape it off. The vibration scraping assembly (32) is disposed on the inner side of at least one of the plate-shaped contacts (24) and includes at least one scraper (322); the scraper (322) is configured to slide in contact with the conductive surface of the stationary conductive contact (211) during the opening and closing strokes to scrape, and to generate vibration perpendicular to the conductive surface of the stationary conductive contact (211) during the sliding process.

2. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 1, characterized in that, The chain plate module is composed of multiple connecting plates (311) connected in sequence by a hinge structure. The connecting plate (311) is provided with a scraping surface and a conical scraping structure, which is used to guide the scraped material to both sides of the connecting plate (311) for discharge.

3. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 1, characterized in that, The hinge structure includes a stop plate (314) on one of the connecting plates (311), a fixing groove (315) on the other connecting plate (311), and a semi-cylindrical hinge shaft (313) axially sleeved on the stop plate (314). Hinges are provided on both sides of the fixing groove (315), and the hinge shaft (313) passes through the hinge shaft (313), causing the end of the stop plate (314) to abut against the fixing groove (315) to limit the relative rotation angle of the adjacent connecting plates (311). A fan-shaped body (312) is also sleeved inside the hinge hole, and one side of the fan-shaped body (312) abuts against the hinge shaft (313) to allow the two adjacent connecting plates (311) to rotate unidirectionally.

4. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 2, characterized in that, The package scraping assembly also includes an elastic reset structure that provides elastic force to the chain plate module. The elastic reset structure includes an arc-shaped rod (316) inserted into two adjacent connecting plates (311). A first stop block is arranged in the middle of each arc-shaped rod (316). A first tension spring (317) is arranged on each arc-shaped rod (316) and on both sides of the first stop block. The first tension spring (317) is elastically adapted to the connecting plate (311) and is used to drive the chain plate module to close.

5. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 1, characterized in that, The package scraping assembly (31) further includes a resilient retaining structure, the resilient retaining structure comprising: A rotating shaft (318) passes through the plate-shaped contact (24) and is fixedly connected to the end of the chain plate module; A fan-shaped abutment (319) is fixed on the rotating shaft (318); The transmission cap (3110) is sleeved on the outside of the rotating shaft (318) and fixedly connected to one side of the plate-shaped contact (24); The stop block (3111) is fixed inside the transmission cap (3110) and abuts against the fan-shaped stop block (319); A torsion spring (3112) is sleeved inside the transmission cap (3110) and its end is fixedly connected to the surface of the rotating shaft (318).

6. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 1, characterized in that, The vibratory scraping assembly includes multiple scraper strips (322); the scraper strips (322) are arranged in an inclined shape, and their inclined direction forms an acute angle with the sliding direction, so as to continuously push and guide the scraped material along the inclined direction and discharge it; the scraper strips (322) are provided with guide grooves (3221); a limit button (325) is fixed on the plate-shaped contact head, and the limit button (325) is slidably adapted to the guide groove (3221); a limit block (3222) is fixedly connected between two adjacent scraper strips (322), and the two limit blocks (3222) abut against each other to realize the linkage displacement of multiple scraper strips (322).

7. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 6, characterized in that, The guide groove (3221) is composed of alternating straight grooves and wave grooves. When the limiting button (325) slides in the wave groove, the scraper (322) generates a reciprocating micro-displacement perpendicular to the conductive surface.

8. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 6, characterized in that, The vibration scraping assembly also includes a second tension spring (326), one end of which is connected to the scraper (322) and the other end is connected to the plate-shaped contact (24) for driving the scraper (322) to reset.

9. The outdoor high-voltage disconnect switch with self-cleaning knife switch contacts according to claim 1, characterized in that, It also includes a bearing insulation unit, which includes a base (1), a stationary contact post insulator (21), a transmission contact post insulator (22) and a rotating support insulator (23) fixed on the base (1); the stationary contact unit is fixed to the end of the stationary contact post insulator (21); the moving contact unit is hinged to the ends of the transmission contact post insulator (22) and the rotating support insulator (23) respectively.

10. A self-cleaning outdoor high-voltage disconnect switch with knife switch contacts according to claim 9, characterized in that, The power transmission unit includes a drive shaft movably connected to the base (1), an operating crank arm fixed to the end of the drive shaft, and an insulating pull rod for connecting the operating crank arm and the moving contact unit.

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