Miniaturized direct current air circuit breaker

Abstract

The application relates to a miniaturized direct-current air circuit breaker, an arc extinguishing unit, the arc extinguishing unit comprising an arc extinguishing base, arc extinguishing grids and an insulating outer frame, the insulating outer frame comprising side plates and a top plate, the side plates being a pair and respectively located on the two sides of the arc extinguishing grids, and a partition groove corresponding to each arc extinguishing grid being further formed on the inner wall of the side plates; an operating unit comprising an operating box, an operating plate being installed in the operating box, the operating plate being an L-shaped plate formed by a vertical plate and a horizontal plate being jointly connected, and the vertical plate being driven to swing by an operating assembly; a communication unit for connecting the operating unit and the arc extinguishing unit, the communication unit comprising first and second communication plates located on the two sides of the arc extinguishing base. The application has the advantages that the arc extinguishing unit is designed in a splicing mode, the processing is convenient, and the mold investment is greatly reduced; the operating unit is jointly matched by the operating plate, the action plate, the first action assembly and the second action assembly, the structure is simple, and the reliability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to an air circuit breaker, in particular to a miniaturized DC air circuit breaker. BACKGROUND

[0002] Air switch, also known as air circuit breaker, is a kind of circuit breaker. It is a kind of switch that automatically disconnects when the current in the circuit exceeds the rated current. Air switch is a very important kind of electrical appliance in low-voltage distribution network and electric drive system. It integrates control and multiple protection functions. In addition to completing contact and breaking circuit, it can also protect against short circuit, severe overload and under-voltage of circuit or electrical equipment. It can also be used for infrequent starting of electric motor.

[0003] For example, patent CN201327781Y mentions a circuit breaker that allows to establish and cut off the current, the circuit breaker comprising a current cut-off device having at least one movable contact able to contact a fixed contact and to separate from the fixed contact, and an arc chamber arranged above the current cut-off device for extinguishing the arc formed when separating the movable and fixed contacts, characterized in that it comprises a protection box body in which the circuit breaker is mounted, the box body comprising a base element and an upper element which are detachably fixed to each other, the cut-off device being mounted in the base element and the arc chamber being mounted in the upper element so that the arc chamber is adapted to the cut-off device, so as to extinguish the arc when the two elements are assembled to each other.

[0004] The circuit breaker in the above structure involves many parts, the product structure is complex, and all the elements are directly installed in the closed protection box body, which requires large mold investment and difficult processing.

[0005] In patent CN115064422A, a self-excited DC air circuit breaker magnetic guiding structure is mentioned. It can better constrain the magnetic field generated by the self-excited coil in the arc chamber, so that the magnetic blowing coil generates a non-uniformly distributed magnetic field in the arc chamber, improving the ability to break small current. It includes a moving contact, a static contact, an arc running path, an arc extinguishing grid, an arc chamber, an arc blowing coil, a front magnetic guide plate, a rear magnetic guide plate, an upper busbar, a lower busbar, and a return flow busbar. The moving contact is hinged to the lower busbar, and the static contact is connected to the upper busbar. Each side of the contact is distributed with an arc blowing coil. Each arc blowing coil is provided with a magnetic core. The arc running path is located above the arc blowing coil, and the grid is located inside the arc running path. The return flow busbar is used to connect the arc blowing coil with the moving contact, the static contact and the arc running path, so as to form a current loop. The grid and the arc running path form an arc chamber. The front magnetic guide plate and the rear magnetic guide plate cover the arc blowing coil.

[0006] In the air circuit breaker described above, the magnetic plate covering the arc-extinguishing grid is insulated by covering it with insulating plastic material. This insulation method results in a semi-enclosed structure for the magnetic plate, meaning that some of the arc-extinguishing grids are directly exposed. This open structure poses a significant risk to insulation. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a miniaturized DC air circuit breaker that is simple in structure, easy to process, and highly reliable.

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is: a miniaturized DC air circuit breaker, the innovation of which lies in: including

[0009] An arc-extinguishing unit includes an arc-extinguishing base, arc-extinguishing grids, and an insulating frame. Several arc-extinguishing grids are arranged side by side on the arc-extinguishing base from top to bottom. The insulating frame includes a side plate and a top plate. There is a pair of side plates, located on both sides of the arc-extinguishing grids respectively. The inner wall of the side plate is also provided with a partition groove for each arc-extinguishing grid to be inserted into. The top plate is connected to the top of the side plate and is located above the arc-extinguishing grids.

[0010] The operating unit includes an operating box connected to the lower end face of the arc extinguishing base. An operating plate is installed inside the operating box. The operating plate is an L-shaped plate formed by connecting a vertical plate and a horizontal plate. The vertical plate is driven to swing by an operating component installed inside the operating box, and the horizontal plate is fixed inside the operating box by a fixing component.

[0011] A connecting unit for connecting the operating unit and the arc extinguishing unit includes a first conductive plate and a second conductive plate located on both sides of the arc extinguishing base. A cavity is opened on the arc extinguishing base to accommodate the installation of the first conductive plate and the second conductive plate. The upper end surfaces of the first conductive plate and the second conductive plate are in communication with the bottom surface of the arc extinguishing grid. The lower end surfaces of the first conductive plate and the second conductive plate are in communication with the vertical plate. The vertical plate is connected to the first conductive plate or to the second conductive plate by swinging the vertical plate.

[0012] Furthermore, the operating components include an action plate connected to the vertical plate, and a first action component and a second action component that drive the action plate to swing and are distributed vertically.

[0013] The actuation plate is vertically installed inside the control box, and the actuation plate is fixed to the vertical plate by bolts;

[0014] The first actuation component includes a first actuation rod, a first guide sleeve, and a first return spring. The first guide sleeve is fixedly installed inside the operation box. A first through hole is also opened on the first guide sleeve to allow the first actuation rod to pass through horizontally and move. After the first actuation rod passes horizontally through the first guide sleeve, a first push shaft is also hinged to the side end of the first actuation rod. The other side of the first push shaft is hinged to the actuation plate. The first return spring is fitted on the outer wall of the first actuation rod. A groove is also opened on the first actuation rod to accommodate the first return spring. After the first return spring is fitted on the first actuation rod, one side of the first return spring abuts against the side wall of the groove, and the other side abuts against the outer wall of the first guide sleeve.

[0015] The second actuating component includes a second actuating rod, a magnetic cylinder, a moving iron core, a coil, a second return spring, and a return disc spring. The magnetic cylinder consists of a cylinder barrel and a left and right sealing plates connected to the left and right sides of the cylinder barrel. The second actuating rod is horizontally placed inside the cylinder barrel, with one side of the second actuating rod extending from the right sealing plate. A second push shaft is hinged to the side of the second actuating rod extending from the right sealing plate, and the other side of the second push shaft is hinged to the actuating plate. The moving iron core is fitted onto the second actuating rod and located near the left sealing plate. A groove for embedding the moving iron core is also provided on the left sealing plate, and a limiting section extending towards the moving iron core is provided on the right sealing plate. One side of the coil is fitted onto the outer wall of the moving iron core, and the other side is fitted onto the outer wall of the limiting section. The second return spring and the return disc spring are both fitted onto the outer wall of the second actuating rod. A first mounting groove for mounting the second return spring is provided in the limiting section, and a second mounting groove for mounting the return disc spring is provided in the moving iron core.

[0016] Furthermore, the fixing assembly includes a first fixing plate installed inside the operating box, a horizontal plate fixed to the fixing plate by screws, the first fixing plate being horizontally positioned and installed inside the operating box by a vertically positioned second fixing plate, the second fixing plate having a mounting hole for the first fixing plate to pass through horizontally and move up and down, the first fixing plate passing through the mounting hole on the second fixing plate being locked and fixed by a locking bolt installed on the second fixing plate, the first fixing plate having a threaded hole that mates with the locking bolt, the locking bolt being threadedly fixed to the second fixing plate.

[0017] Furthermore, a retaining spring is provided on both the first and second conductive plates of the arc-extinguishing base, so that the upper end face of the first or second conductive plate can be made to fit and conduct with the arc-extinguishing grid plate through the cooperation of the retaining spring.

[0018] Furthermore, the connection between the arc-extinguishing base and the operating box is as follows: there is an outwardly protruding mounting protrusion on each side of the arc-extinguishing base, and a vertically arranged first mounting hole is opened on the mounting protrusion. A second mounting hole is also opened on the operating box. After the bolt passes through the first mounting hole and the second mounting hole in sequence, it is locked with a nut, thereby realizing the fixation between the arc-extinguishing base and the operating box.

[0019] The advantages of this invention are as follows: In this invention, by improving the structure of the traditional air circuit breaker, the arc extinguishing unit adopts a combination of an arc extinguishing base, an arc extinguishing grid, and an insulating outer frame. Furthermore, the insulating outer frame adopts a side plate and a top plate design, thereby enabling the entire arc extinguishing unit to adopt an assembly design, which is convenient for processing and significantly reduces mold investment.

[0020] The operating unit uses the operation panel, action panel, first action component, and second action component in cooperation. The first action component and the second action component form a four-bar linkage transmission structure with a non-fixed rotation center to drive the operation panel to perform actions. The structure is simple and highly reliable.

[0021] The outer frame is a fully insulated frame formed by connecting the side panels and the top panel, ensuring overall insulation.

[0022] The design of the fixing components uses the cooperation of the first fixing plate and the second fixing plate to install the horizontal plate. In addition to fixing the horizontal plate, it can also adjust the vertical position of the horizontal plate, thereby adjusting the height of the entire operating panel.

[0023] The spring design is intended to work in conjunction with the first and second conductive plates, using the spring force to apply a certain pressure to the first and second conductive plates, thereby enabling the first and second conductive plates to stably adhere to the arc-extinguishing grid. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the miniaturized DC air circuit breaker of the present invention.

[0026] Figure 2 This is a cross-sectional view of the miniaturized DC air circuit breaker of the present invention. Detailed Implementation

[0027] The following embodiments are intended to enable those skilled in the art to more fully understand the present invention, but do not limit the invention to the scope of the embodiments described.

[0028] like Figure 1 , Figure 2A miniaturized DC air circuit breaker is shown, comprising:

[0029] Arc extinguishing unit 1 includes an arc extinguishing base 11, an arc extinguishing grid 12, and an insulating outer frame.

[0030] The arc-extinguishing base 11 is a rectangular plate.

[0031] There are several arc-extinguishing grid plates 12, which are arranged side by side from top to bottom on the arc-extinguishing base 11. The arc-extinguishing grid plates 12 are also rectangular plates.

[0032] The insulating outer frame includes side plates 13 and a top plate 14. There is a pair of side plates 13, which are located on both sides of the arc-extinguishing grid 12. The height of the side plates 13 is higher than the height of the uppermost arc-extinguishing grid 12. On the inner wall of the side plates 13, there are also partition slots for each arc-extinguishing grid 12 to be inserted one by one. There is a gap between adjacent partition slots, and the partition slots on the two side plates 13 correspond one by one. The two sides of the arc-extinguishing grid 12 are respectively inserted into the partition slots on the two insertion plates 13. The bottom end of the side plate 13 is connected and fixed to the arc-extinguishing base 11 by bolts. The top plate 14 is connected to the top of the side plate 13. The top plate 14 is located above the arc-extinguishing grid 12. The top plate 14 and the side plate 13 are connected and fixed by several bolts.

[0033] During the assembly of the arc-extinguishing unit, firstly, each arc-extinguishing grid plate 12 is inserted into the partition groove of the side plate from bottom to top. Then, the top plate 14 is connected and fixed to the two side plates 13 by bolts. Finally, the two side plates 13 are fixedly connected to the arc-extinguishing base 11 by bolts to complete the assembly. The entire arc-extinguishing unit adopts a modular design, and only bolts are needed for connection, which is convenient for processing. Moreover, based on this structure, the individual processing of components can be achieved when developing the mold, making the mold relatively simple and significantly reducing the corresponding mold investment.

[0034] The operating unit 2 includes an operating box connected to the lower end face of the arc extinguishing base 11. The operating box includes an operating base plate 201, an operating side plate 202, and an operating top plate 203. The operating top plate 203 and the operating base plate 201 are arranged vertically and parallel to each other. The operating side plate 202 is located between the operating top plate 203 and the operating base plate 201 and is fixed to the operating top plate 203 and the operating base plate 201 by bolts. The size of the operating top plate 203 is larger than the size of the arc extinguishing base 11, and the size of the operating base plate 201 is smaller than the size of the operating top plate 203.

[0035] The connection between the arc extinguishing base 11 and the control box is as follows: There is an outward protruding mounting protrusion 15 on each side of the arc extinguishing base 11. A first mounting hole is vertically set on the mounting protrusion 15. A second mounting hole is also opened on the operating top plate 203 of the control box. After the bolt passes through the first mounting hole and the second mounting hole in sequence, it is locked with a nut, thereby realizing the fixation between the arc extinguishing base 11 and the control box.

[0036] An operating panel is installed inside the operating box. The operating panel is an L-shaped panel formed by connecting a vertical plate 204 and a horizontal plate 205. The vertical plate 204 and the horizontal plate 205 are integrally formed by bending. The junction of the vertical plate 204 and the horizontal plate 205 is arc-shaped. The vertical plate 204 is driven to swing by an operating component installed inside the operating box. The horizontal plate 205 is fixed inside the operating box by a fixing component.

[0037] The operating components include an action plate 206 connected to the vertical plate 204, and a first action component and a second action component that drive the action plate 206 to swing and are distributed vertically.

[0038] The actuation plate 206 is a vertical plate and is vertically installed inside the control box. The actuation plate 206 is fixed to the vertical plate 204 by bolts. The upper part of the actuation plate 206 is connected to the first actuation component, the middle part of the actuation plate 206 is connected to the second actuation component, and the bottom end of the actuation plate 206 is hinged to the control box.

[0039] The first actuation component includes a first actuation rod 207, a first guide sleeve 209, and a first return spring 208. The first guide sleeve 209 is fixedly installed inside the operation box. The outer wall of the first guide sleeve 209 is T-shaped. A first through hole is also opened in the first guide sleeve 209 to allow the first actuation rod 207 to pass through and move horizontally. After the first actuation rod 207 passes horizontally through the first guide sleeve 209, a first push shaft 210 is also hinged to the side end of the first actuation rod 207. The other side of the first push shaft 210 is hinged to the actuation plate 206.

[0040] The first return spring 208 is fitted onto the outer wall of the first actuating rod 207. A groove is also provided on the first actuating rod 207 to accommodate the first return spring 208, so that the first actuating rod 207 is T-shaped as a whole. The smaller part of the first actuating rod 207 passes through the first through hole in the first guide sleeve 209. The first return spring 208 is fitted into the groove of the first actuating rod 207. One side of the first return spring 208 abuts against the side wall of the groove, and the other side of the first return spring 208 abuts against the outer wall of the first guide sleeve 209.

[0041] The second actuation component includes a second actuation rod 211, a magnetic cylinder, a moving iron core 212, a coil 213, a second return spring 214, and a return disc spring 215.

[0042] The magnetic cylinder is composed of a cylinder 216 and a left sealing plate 217 and a right sealing plate 218 connected to the left and right sides of the cylinder. The cylinder 216 is a hollow cylindrical structure with openings on both sides. Annular positioning grooves are also opened on the inner walls of both sides of the cylinder 216 to accommodate the left sealing plate 217 and the right sealing plate 218. After the left sealing plate 217 and the right sealing plate 218 are inserted into the positioning grooves in the cylinder 216, they are fixed to the cylinder 216. The left sealing plate 217, the right sealing plate 218 and the cylinder 216 together form a cavity for accommodating the second actuating rod 211, the moving iron core 212, the coil 213, the second return spring 214, and the return disc spring 215.

[0043] The second actuating rod 211 is horizontally placed inside the cylinder 216, and one side of the second actuating rod 211 extends out from the right sealing plate 218. The right sealing plate 218 has a through hole for the second actuating rod 211 to pass through. A second push shaft 219 is hinged to the side of the second actuating rod 211 that extends out of the right sealing plate 218, and the other side of the second push shaft 219 is hinged to the actuating plate 206.

[0044] The moving iron core 212 is mounted on the second actuating rod 211, and the moving iron core 212 is located on the side close to the left sealing plate 217. The left sealing plate 217 also has a groove for the moving iron core 212 to be embedded and installed. The right sealing plate 218 has a limiting section 220 extending towards the moving iron core. The limiting section 220 is designed to cooperate with the moving iron core 212 and play a limiting role in the stroke range of the moving iron core 212.

[0045] One side of the coil 213 is fitted onto the outer wall of the moving iron core 212, and the other side of the coil 213 is fitted onto the outer wall of the limiting section 220. The outer wall of the coil 213 is in contact with the inner wall of the cylinder 216.

[0046] The second return spring 214 and the return disc spring 215 are both mounted on the outer wall of the second actuating rod 211. The second actuating rod 211 is a stepped structure composed of a first segment and a second segment, and the size of the first segment is larger than that of the second segment. The first segment extends out of the right sealing plate 218 and is connected to the second push shaft 219. The second return spring 214 is mounted on the outer wall of the first segment, and the return disc spring 215 is mounted on the outer wall of the second segment. A first mounting groove for installing the second return spring 214 is also opened in the limiting segment 220, and a second mounting groove for installing the return disc spring 215 is also opened in the moving iron core 212. One side of the second return spring 214 abuts against the inner wall of the first mounting groove, and the other side of the second return spring 214 abuts against the return disc spring 215. The other side of the return disc spring 215 abuts against the inner wall of the second mounting groove.

[0047] The fixing assembly includes a first fixing plate 222 installed inside the control box. A horizontal plate 205 is fixed to the upper surface of the first fixing plate 222 by screws or bolts. The first fixing plate 222 is horizontally positioned inside the control box and is also installed inside the control box by a vertically positioned second fixing plate 223. The second fixing plate 223 has mounting holes that allow the first fixing plate 222 to pass horizontally and move vertically. After the first fixing plate 222 passes through the mounting holes in the second fixing plate 223, it is locked in place by locking bolts installed on the second fixing plate 223. The first fixing plate 222 has threaded holes that mate with the locking bolts, and the locking bolts are threadedly fixed to the second fixing plate 223. The fixing assembly is designed to use the cooperation of the first fixing plate 222 and the second fixing plate 223 to install the horizontal plate 205. In addition to fixing the horizontal plate 205, it also allows for adjustment of the vertical position of the horizontal plate 205, thereby adjusting the overall height of the control panel.

[0048] A communication unit for connecting the operating unit 2 and the arc extinguishing unit 1 includes a first conductive plate 31 and a second conductive plate 32 located on both sides of the arc extinguishing base 11. The first conductive plate 31 and the second conductive plate 32 are located on both sides of the long axis of the lowermost arc extinguishing grid plate 12. A cavity is opened on the arc extinguishing base 11 to accommodate the installation of the first conductive plate 31 and the second conductive plate 32. The first conductive plate 31 and the second conductive plate 32 are both elastic plates. The upper end surfaces of the first conductive plate 31 and the second conductive plate 32 are in communication with the bottom surface of the arc extinguishing grid plate 12. The lower end surfaces of the first conductive plate 31 and the second conductive plate 32 are in communication with the vertical plate 204. The vertical plate 204 is connected to the first conductive plate 31 or the second conductive plate 32 by swinging the vertical plate 204.

[0049] A retaining spring 33 is also provided on the arc-extinguishing base 11 at the first conductive plate 31 and the second conductive plate 32. The retaining spring 33 is used to achieve contact and conduction between the upper end surface of the first conductive plate 31 or the second conductive plate 32 and the arc-extinguishing grid plate 12. The retaining spring 33 is designed to cooperate with the first conductive plate 31 and the second conductive plate 32, and use the spring force to apply a certain pressure to the first conductive plate 31 and the second conductive plate 32, so that the first conductive plate 31 and the second conductive plate 32 can stably contact the arc-extinguishing grid plate 12.

[0050] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents. 。

Claims

1. A miniaturized DC air circuit breaker, characterized in that: include An arc-extinguishing unit includes an arc-extinguishing base, arc-extinguishing grids, and an insulating frame. Several arc-extinguishing grids are arranged side by side on the arc-extinguishing base from top to bottom. The insulating frame includes a side plate and a top plate. There is a pair of side plates, located on both sides of the arc-extinguishing grids respectively. The inner wall of the side plate is also provided with a partition groove for each arc-extinguishing grid to be inserted into. The top plate is connected to the top of the side plate and is located above the arc-extinguishing grids. The operating unit includes an operating box connected to the lower end face of the arc extinguishing base. An operating plate is installed inside the operating box. The operating plate is an L-shaped plate formed by connecting a vertical plate and a horizontal plate. The vertical plate is driven to swing by an operating component installed inside the operating box, and the horizontal plate is fixed inside the operating box by a fixing component. A connecting unit for connecting the operating unit and the arc extinguishing unit, the connecting unit includes a first conductive plate and a second conductive plate located on both sides of the arc extinguishing base. A cavity is opened on the arc extinguishing base to accommodate the installation of the first conductive plate and the second conductive plate. The upper end surfaces of the first conductive plate and the second conductive plate are connected to the bottom surface of the arc extinguishing grid plate. The lower end surfaces of the first conductive plate and the second conductive plate are connected to the vertical plate. The vertical plate is connected to the first conductive plate or to the second conductive plate by swinging the vertical plate. The operating components include an action plate connected to the vertical plate, and a first action component and a second action component that drive the action plate to swing and are distributed vertically. The actuation plate is vertically installed inside the control box, and the actuation plate is fixed to the vertical plate by bolts; The first actuation component includes a first actuation rod, a first guide sleeve, and a first return spring. The first guide sleeve is fixedly installed inside the operation box. A first through hole is also opened on the first guide sleeve to allow the first actuation rod to pass through horizontally and move. After the first actuation rod passes horizontally through the first guide sleeve, a first push shaft is also hinged to the side end of the first actuation rod. The other side of the first push shaft is hinged to the actuation plate. The first return spring is fitted on the outer wall of the first actuation rod. A groove is also opened on the first actuation rod to accommodate the first return spring. After the first return spring is fitted on the first actuation rod, one side of the first return spring abuts against the side wall of the groove, and the other side abuts against the outer wall of the first guide sleeve. The second actuating component includes a second actuating rod, a magnetic cylinder, a moving iron core, a coil, a second return spring, and a return disc spring. The magnetic cylinder consists of a cylinder barrel and a left and right sealing plates connected to the left and right sides of the cylinder barrel. The second actuating rod is horizontally placed inside the cylinder barrel, with one side of the second actuating rod extending from the right sealing plate. A second push shaft is hinged to the side of the second actuating rod extending from the right sealing plate, and the other side of the second push shaft is hinged to the actuating plate. The moving iron core is fitted onto the second actuating rod and located near the left sealing plate. A groove for embedding the moving iron core is also provided on the left sealing plate, and a limiting section extending towards the moving iron core is provided on the right sealing plate. One side of the coil is fitted onto the outer wall of the moving iron core, and the other side is fitted onto the outer wall of the limiting section. The second return spring and the return disc spring are both fitted onto the outer wall of the second actuating rod. A first mounting groove for mounting the second return spring is provided in the limiting section, and a second mounting groove for mounting the return disc spring is provided in the moving iron core.

2. The miniaturized DC air circuit breaker according to claim 1, characterized in that: The fixing assembly includes a first fixing plate installed inside the operating box. A horizontal plate is fixed to the fixing plate by screws. The first fixing plate is horizontally positioned and installed inside the operating box by a vertically positioned second fixing plate. The second fixing plate has a mounting hole that allows the first fixing plate to pass horizontally and move up and down. After the first fixing plate passes through the mounting hole on the second fixing plate, it is locked and fixed by a locking bolt installed on the second fixing plate. The first fixing plate has a threaded hole that mates with the locking bolt, and the locking bolt is threadedly fixed to the second fixing plate.

3. The miniaturized DC air circuit breaker according to claim 1, characterized in that: The arc-extinguishing base is also equipped with a retaining spring at the first and second conductive plates. The upper surface of the first or second conductive plate is made to fit and conduct with the arc-extinguishing grid plate through the cooperation of the retaining spring.

4. The miniaturized DC air circuit breaker according to claim 1, characterized in that: The connection between the arc-extinguishing base and the control box is as follows: there is an outward protruding mounting protrusion on each side of the arc-extinguishing base, and a vertically set first mounting hole is opened on the mounting protrusion. A second mounting hole is also opened on the control box. After the bolt passes through the first mounting hole and the second mounting hole in sequence, it is locked with a nut, thereby realizing the fixation between the arc-extinguishing base and the control box.

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