A switching device

Abstract

The utility model relates to a kind of switch devices, comprising: moving contact system, including first moving contact, contact sheet and second moving contact component, second moving contact component includes component one and second moving contact;Static contact system, including first static contact and the second static contact component being set above first static contact, second static contact component includes support and the second static contact being set on support, arc starter, component two;Arc extinguishing component is set above moving contact system and static contact system, including component three, component four and multiple arc extinguishing grid sheet;Second moving contact is located in the top surface of component one one end, and the other end of the top surface of component one extends to component two and is in contact with its underside;Component one, component two, component three and component four build the second moving contact component, second static contact component and arc extinguishing component inner cavity into airtight area.Compared with prior art, the utility model improves the air tightness of arc extinguishing system, thereby increasing arc blowing gas pressure, improves breaking reliability.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical components, and in particular to a switching device. Background Technology

[0002] In photovoltaic and energy storage power generation systems and AC / DC power distribution systems, with the continuous advancement of power grid technology, system capacity is increasing, system voltage is rising, and the requirements for short-circuit fault current breaking capacity are also constantly increasing. Currently, conventional frame circuit breakers and disconnectors on the market generally lack effective protection and shielding measures for the gap between the moving and stationary contacts. This results in the inability to quickly establish a pressure difference between the contacts and the arc-extinguishing chamber during high-current breaking, causing the arc to easily retreat between the contacts, leading to arc voltage drops and severe contact erosion. This is especially problematic in high-voltage DC switches, where breaking failure is more likely. Most current circuit breakers and disconnectors address this issue by adding a simple arc contact to the moving contact, but this increases the overall depth and size of the product. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a switching device that improves the airtightness between contacts during the breaking process.

[0004] The objective of this utility model can be achieved through the following technical solutions: A switching device, comprising: The moving contact system (1) includes a first moving contact (16), a contact piece (17), and a second moving contact assembly. The second moving contact assembly includes a first component (11) and a second moving contact (12). The first component (11) and the second moving contact (12) are both fixed on the contact piece (17), and the second moving contact (12) is located on the upper side of the first component (11). The stationary contact system (2) includes a first stationary contact (27) and a second stationary contact assembly disposed above the first stationary contact (27). The second stationary contact assembly includes a support (21) and a second stationary contact (23), an arc-drawing element (24), and a component two (22) disposed on the support (21). The second stationary contact (23) is disposed at one end of the support (21) facing the moving contact system (1), and the arc-drawing element (24) is located above the component two (22). An arc-extinguishing assembly (3) is disposed above the moving contact system (1) and the stationary contact system (2), including component three (31), component four (32) and multiple arc-extinguishing grid plates (33); component three (31) includes two block structures arranged opposite to each other, component four (32), the second moving contact assembly and the second stationary contact assembly are all disposed between the two block structures, and the arc-extinguishing grid plates (33) are arranged in a row on the upper side of component three (31); component four (32) is made of conductive material, and component four (32) extends from one end of component one (11) to one end of the row of arc-extinguishing grid plates (33), and the arc-initiating element (24) extends from the support (21) to the other end of the row of arc-extinguishing grid plates (33); The second moving contact (12) is located at one end of the top surface of the first component (11), and the other end of the top surface of the first component (11) extends toward the second component (22) and abuts against its lower side; the first component, the second component (22), and the third component (31) are all made of insulating material, and the first component (11), the second component (22), the third component (31), and the fourth component (32) construct a sealed area for the inner cavity of the second moving contact assembly, the second stationary contact assembly, and the arc extinguishing assembly (3).

[0005] Furthermore, one end of the component one (11) that abuts against the lower side of the component two (22) is provided with a protrusion one (111), and the other end is provided with a protrusion two (112) that is higher than the protrusion one (111). One end of the component four (32) is above the protrusion two (112). The front side of the protrusion two (112) is provided with a square hole (113) that penetrates the component one (11). A part of the contact piece (17) passes through the square hole (113) from the lower side of the component one (11) and is located in front of the protrusion two (112). The second moving contact (12) is provided on the part of the contact piece (17) that passes through the square hole (113). The top surfaces of the component one (11) are respectively provided with enclosures (114).

[0006] Furthermore, the first component (11) is an arc-shaped structure that bends from the first protrusion (111) to the second protrusion (112).

[0007] Furthermore, the second component (22) is a strip structure with a U-shaped cross section, and it wraps the bottom and sides of the support (21). The part of the outer wall of the second component (22) that abuts against the first component (11) is always located inside the enclosure (114).

[0008] Furthermore, the upper side of the third component (31) is provided with a plurality of slots (311) for setting the arc-extinguishing grid plate (33), and the inner walls of the two block structures of the third component (31) are provided with opening slots (312) that match the enclosure (114) of the first component (11), and the enclosures (114) on both sides of the first component (11) are respectively placed in the two opening slots (312).

[0009] Furthermore, the fourth component (32) is provided with a bending structure.

[0010] Furthermore, the stationary contact system (2) also includes a stationary busbar (28), a corner plate (25), and a component five (26). The support (21) is disposed on the upper side of the stationary busbar (28) through the corner plate (25). The first stationary contact (27) is disposed on the side of the stationary busbar (28) facing the moving contact system (1). The component five (26) wraps around the partially exposed stationary busbar (28) and the corner plate (25).

[0011] Furthermore, the arc extinguishing assembly (3) also includes a side plate (37), a baffle (34), and a cover plate (35); the side plate (37) includes two, which are respectively disposed on the outside of the two block structures of the component three (31); the lower side of the baffle (34) is provided with an air port and a slot for setting the arc extinguishing grid plate (33); the cover plate (35) is fastened to the top of the baffle (34) and the side plate (37).

[0012] Furthermore, the arc extinguishing component (3) also includes a free mesh plate (36), and the upper side of the baffle (34) is provided with a square groove for placing the free mesh plate (36).

[0013] Furthermore, the arc-extinguishing grid (33) includes two sets of grids of different sizes, which are respectively disposed above the moving contact system (1) and the stationary contact system (2).

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In this device, the two parts of component one, component two, and component three, as well as component four, construct the inner cavity of the second moving contact assembly, the second stationary contact assembly, and the arc extinguishing assembly into a narrow and sealed area, which improves the airtightness of the arc extinguishing system, thereby increasing the arc blowing gas pressure and improving the reliability of the break.

[0015] 2. All components are fitted together using a guide rail and slide groove structure. They are independently installed on their respective functional modules and are combined to achieve airtightness. Assembly is simple and convenient.

[0016] 3. Component five wraps the exposed stationary busbars and corner plates to prevent breakdown at the first moving and stationary contacts and improve the insulation performance between contacts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the switching device in the embodiment; Figure 2 This is a schematic diagram of the moving contact system and the stationary contact system in the embodiment; Figure 3 This is a cross-sectional schematic diagram of the switching device in the embodiment; Figure 4 This is a schematic diagram of the moving contact system in the embodiment; Figure 5 This is a structural schematic diagram of component one in the embodiment; Figure 6 This is a schematic diagram of the stationary contact system in the embodiment; Figure 7 This is a schematic diagram of the structure of component two in the embodiment; Figure 8 This is a structural schematic diagram of component five in the embodiment; Figure 9 This is a schematic diagram of the arc-extinguishing component in the embodiment; Figure 10 This is a structural schematic diagram of component three in the embodiment; Figure 11 This is a schematic diagram of the structure of the three components arranged in two opposite parts in the embodiment; Figure 12 This is a schematic diagram of the overall regional structure of the combination of various components in the embodiment; Figure 13 This is a schematic cross-sectional view of the area where the components are combined in the embodiment; Figure 14 This is a top view of the structure of the area where the components are combined in the embodiment.

[0018] Figure label: 1-Moving contact system; 11-Component 1; 111-Protrusion 1; 112-Protrusion 2; 113-Square hole; 114-Enclosure; 12-Second moving contact; 13-First rotation center; 14-Second rotation center; 15-Contact cover; 16-First moving contact; 17-Contact piece; 18-Clamping plate; 181-Contact support; 182-Bracket; 19-Moving busbar; 2-Static contact system; 21-Support; 2 2-Component Two; 221-Limiting Boss; 23-Second Static Contact; 24-Arc Initiation Component; 25-Angle Plate; 26-Component Five; 27-First Static Contact; 28-Static Busbar; 3-Arc Extinguishing Assembly; 31-Component Three; 311-Slot; 312-Opening Slot; 32-Component Four; 33-Arc Extinguishing Grid Plate; 34-Baffle; 35-Cover Plate; 36-Anti-Free Net Plate; 37-Side Plate; 4-Base; 5-Bottom Plate. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0020] like Figure 1-3 As shown, this application proposes a switching device, including a moving contact system 1, a stationary contact system 2, and an arc-extinguishing assembly 3. The moving contact system 1 includes a first moving contact 16, a contact piece 17, and a second moving contact assembly. The second moving contact assembly includes a first component 11 and a second moving contact 12. Both the first component 11 and the second moving contact 12 are fixed to the contact piece 17 by riveting or screw connection, and the second moving contact 12 is located above the first component 11. The stationary contact system 2 includes a first stationary contact 27 and a second stationary contact assembly disposed above the first stationary contact 27. The second stationary contact assembly includes a support 21 and a second stationary contact 23, an arc-inducing element 24, and a second component 22 disposed on the support 21. The second stationary contact 23 is located at the end of the support 21 facing the moving contact system 1 and is fixed by riveting or screw connection. The arc-inducing element 24 is located above the second component 22. The arc-extinguishing assembly 3 is positioned above the moving contact system 1 and the stationary contact system 2, and includes component three 31, component four 32, and multiple arc-extinguishing grid plates 33. Component three 31 comprises two opposing block structures, with component four 32, the second moving contact assembly, and the second stationary contact assembly positioned between these two block structures. The arc-extinguishing grid plates 33 are arranged in a row on the upper side of component three 31. Component four 32 is made of conductive material and extends from one end of component one 11 to one end of the row of arc-extinguishing grid plates 33. The arc-initiating element 24 extends from the support 21 to the other end of the row of arc-extinguishing grid plates 33. The device has a base 4 on the side where the moving contact system 1 is located and a base plate 5 on the side where the stationary contact system 2 is located.

[0021] The second moving contact 12 is located at one end of the top surface of component 11, and the other end of the top surface of component 11 extends toward component 22 and abuts against its lower side. Components 11, 22, and 31 are all made of insulating material. Components 11, 22, 31, and 32 together form a sealed area within the cavity of the second moving contact assembly, the second stationary contact assembly, and the arc extinguishing assembly 3.

[0022] This switchgear, by adding a partition assembly between the arc contacts, constructs a narrow and sealed cavity area for the second moving contact assembly, the second stationary contact assembly, and the inner cavity of the arc extinguishing assembly 3 throughout the entire process of the switch moving from the closed position to the open position. This allows a pressure difference to be quickly established between the second moving and stationary contacts and the cavity of the arc extinguishing assembly 3 during high current interruption, enabling the arc to quickly enter the arc extinguishing assembly 3, burn stably, and extinguish rapidly, thus improving the breaking performance.

[0023] like Figure 4 As shown, the moving contact system 1 also includes a moving busbar 19, a contact support 181, a contact cover 15, a clamping plate 18, and a bracket 182. The bracket 182 is connected to one end of the clamping plate 18 via a first rotation center 13, and the contact support 181 is connected to the other end of the clamping plate 18 via a second rotation center 14. The moving busbar 19 is disposed in the bracket 182, and the first moving contact 16, the contact piece 17, and the second moving contact assembly are disposed on the contact support 181. The contact cover 15 is disposed on the contact support 181 and located below component 11.

[0024] like Figure 5 As shown, component 11 can be spliced ​​using a symmetrical left-right structure. In actual implementation, it can also be spliced ​​front-back or made into a whole; the implementation method is not limited. One end of component 11 that abuts against the lower side of component 22 has a small protrusion 111, and the opposite end has a protrusion 112 that is higher than protrusion 111. In this embodiment, the height of protrusion 111 is 0.5mm to 2.5mm, and the height of protrusion 112 is 3mm to 20mm, with a triangular or trapezoidal shape. The front side of protrusion 112 has a square hole 113 penetrating component 11. Circular through holes are provided on both sides of the square hole 113. The distance D2 from the front end face of the square hole 113 to the front protrusion 111 is greater than the opening distance D1 between the second moving contact 12 and the second stationary contact 23. Figure 3 As shown. A portion of the contact piece 17 passes through the square hole 113 from the underside of component 11 and is located in front of the second protrusion 112. The second moving contact 12 is located on the portion of the contact piece 17 that extends out of the square hole 113 and can be fastened to the contact piece 17 by riveting or screwing. Both sides of the top surface of component 11 are provided with retaining walls 114, which are elongated structures with a width of 1mm to 2.5mm and a height of 1.5 to 3mm. Component 11 is an arc-shaped structure that curves from the first protrusion 111 to the second protrusion 112. The second protrusion 112 at the tail of component 11 faces the base 4, and the first protrusion 111 at the front faces the stationary contact system 2. Component 11 and the contact piece 17 are fastened by riveting or screwing, and the movement trajectories of the second moving contact 12, component 11, and contact piece 17 are consistent.

[0025] like Figure 6 As shown, the stationary contact system 2 also includes a stationary busbar 28, a corner plate 25, and a component 26. The support 21 is set on the upper side of the stationary busbar 28 through the corner plate 25. The first stationary contact 27 is set on the side of the stationary busbar 28 facing the moving contact system 1. The component 26 wraps around the partially exposed stationary busbar 28 and the corner plate 25.

[0026] The support 21 adopts a T-shaped design. A groove is cut in the middle of the front end of the support 21, with round holes on both sides of the groove. The rear end face has 2-3 threaded holes, round bosses on both sides, and a round countersunk hole and threaded hole at the bottom. The second stationary contact 23 is placed in the groove in the middle of the front end of the support 21 and secured with rivets or screws. The arc-starting element 24 is placed on top of the support 21 and secured with screws through the round countersunk hole at the bottom. The support 21 is then fastened to the angle plate 25 with screws.

[0027] like Figure 7 As shown, component 22 is a U-shaped strip structure that encloses the bottom and sides of support 21. The portion of the outer wall of component 22 that abuts against component 11 is always within enclosure 114. Component 22 can be assembled using a symmetrical left-right structure or made as a single unit. Component 22 has circular through holes on both sides, a square groove and a circular through hole on the bottom surface, and a limiting boss 221 at the front end of each side, with a height not exceeding 3mm. The circular bosses on both sides of support 21 fall into the circular holes on both sides of component 22. The limiting bosses 221 of component 22 are fastened to the top of the groove sidewall at the front end of support 21, and component 22 is secured to support 21 by screws through the circular holes at the bottom of component 22.

[0028] like Figure 8 As shown, component 5.26 is an insulator, specifically an "N"-type or "L"-type sheet-like insulator. Component 5.26 has a boss structure at the front end of its bottom surface and a circular through hole in the center of its bottom surface. Component 5.26 has a rectangular notch in the center of its back surface.

[0029] like Figure 9 As shown, the arc-extinguishing assembly 3 also includes a side plate 37, a baffle 34, a cover plate 35, and a free-electrode grid plate 36. Two side plates 37 are respectively disposed on the outer sides of the two parts of the assembly 31. The baffle 34 is fixed above the arc-extinguishing grid plate 33 and on the inner side of the top of the side plate 37. The lower side of the baffle 34 has an air vent and a slot for placing the arc-extinguishing grid plate 33, with each grid plate 33 corresponding to a slot. The cover plate 35 is fastened to the top of the baffle 34 and the side plate 37 and can be secured with screws. The upper side of the baffle 34 has a square groove for placing the free-electrode grid plate 36, allowing the free-electrode grid plate 36 to be placed in the square groove. In this embodiment, the arc-extinguishing grid plate 33 includes two sets of grid plates of different sizes, respectively disposed above the moving contact system 1 and the stationary contact system 2. The arc-extinguishing grid plates 33 are fixed to the side plate 37 by riveting or snap-fitting. The height of one set of arc-extinguishing grid plates 33 is lower than that of the other set of arc-extinguishing grid plates 33. In terms of grid plate arrangement, the set of arc-extinguishing grid plates 33 with a lower height is placed above the moving contact system 1, and the set of arc-extinguishing grid plates 33 with a higher height is placed above the stationary contact system 2. All grid plates are arranged alternately according to the notch position.

[0030] like Figure 10 , Figure 11 As shown, the upper side of component 31 has multiple slots 311 for mounting the arc-extinguishing grid 33, each corresponding to one of the pins of the arc-extinguishing grid 33, and completely enclosing the pins of the arc-extinguishing grid 33. Component 31 and side plate 37 can be fixed with screws. The inner walls of the two opposing block structures of component 31 have opening slots 312 that match the enclosures 114 of component 11, and the enclosures 114 on both sides of component 11 are respectively placed in the two opening slots 312.

[0031] Component 4 32 has a bent structure; in this embodiment, it is a flat plate with a V-shaped structure in the middle. One end of component 4 32 is above protrusion 2 112, and the other end extends towards one end of the arc-extinguishing grid plate 33. In this embodiment, the gap between the top of protrusion 2 112 and the bottom of component 4 32 is no greater than 1.5 mm. Component 4 32 is fixed within the V-shaped groove formed by the inner walls of the two parts of component 3 31.

[0032] During the closing process, the fastened second moving contact 12, component 11, and contact piece 17 first rotate clockwise around the first rotation center 13 on the moving contact system 1 towards the stationary contact system 2. After the second moving contact 12 contacts the second stationary contact 23 on the second stationary contact assembly, it rotates clockwise around the second rotation center 14 until the switch is fully closed. During the opening process, it first rotates counterclockwise around the second rotation center 14 on the moving contact system 1 towards the base 4. After the second moving contact 12 contacts and separates from the second stationary contact 23 on the second stationary contact assembly, it rotates counterclockwise around the first rotation center 13 until the switch is fully open.

[0033] Throughout the process, the front end boss of component 11 is always located below component 22, and the outer side wall of component 22 is always located inside the enclosure 114 of component 11. The enclosure 114 of component 11 is always in the arc-shaped opening groove 312 of component 31, and the protrusion 2 112 at the tail of component 11 is located below component 4 32.

[0034] like Figure 12-14 As shown, components 11, 22, 31, and 42 construct a narrow and enclosed space region I within the cavity formed by the second moving contact assembly, the second stationary contact assembly, and the arc-extinguishing assembly 3, as indicated by the red lines in the figure. During the current interruption process, a voltage difference is rapidly established through this region I, quickly propelling the arc into the arc-extinguishing assembly 3. Simultaneously, component 5 26 wraps around part of the exposed stationary busbar 28 and the corner plate 25 to prevent breakdown at the first moving and stationary contacts and improve the insulation performance between the contacts.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0040] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A switching device, characterized in that, include: The moving contact system (1) includes a first moving contact (16), a contact piece (17), and a second moving contact assembly. The second moving contact assembly includes a first component (11) and a second moving contact (12). The first component (11) and the second moving contact (12) are both fixed on the contact piece (17), and the second moving contact (12) is located on the upper side of the first component (11). The stationary contact system (2) includes a first stationary contact (27) and a second stationary contact assembly disposed above the first stationary contact (27). The second stationary contact assembly includes a support (21) and a second stationary contact (23), an arc-drawing element (24), and a component two (22) disposed on the support (21). The second stationary contact (23) is disposed at one end of the support (21) facing the moving contact system (1), and the arc-drawing element (24) is located above the component two (22). An arc-extinguishing assembly (3) is disposed above the moving contact system (1) and the stationary contact system (2), including component three (31), component four (32) and multiple arc-extinguishing grid plates (33); component three (31) includes two block structures arranged opposite to each other, component four (32), the second moving contact assembly and the second stationary contact assembly are all disposed between the two block structures, and the arc-extinguishing grid plates (33) are arranged in a row on the upper side of component three (31); component four (32) is made of conductive material, and component four (32) extends from one end of component one (11) to one end of the row of arc-extinguishing grid plates (33), and the arc-initiating element (24) extends from the support (21) to the other end of the row of arc-extinguishing grid plates (33); The second moving contact (12) is located at one end of the top surface of the first component (11), and the other end of the top surface of the first component (11) extends toward the second component (22) and abuts against its lower side; the first component, the second component (22), and the third component (31) are all made of insulating material, and the first component (11), the second component (22), the third component (31), and the fourth component (32) construct a sealed area for the inner cavity of the second moving contact assembly, the second stationary contact assembly, and the arc extinguishing assembly (3).

2. A switching device according to claim 1, characterized in that, The component one (11) has a protrusion one (111) at one end that abuts against the lower side of the component two (22), and a protrusion two (112) at the other end that is higher than the protrusion one (111). One end of the component four (32) is above the protrusion two (112). The front side of the protrusion two (112) has a square hole (113) that penetrates the component one (11). A part of the contact piece (17) passes through the square hole (113) from the lower side of the component one (11) and is located in front of the protrusion two (112). The second moving contact (12) is located on the part of the contact piece (17) that passes through the square hole (113). The top surface of the component one (11) is provided with a barrier (114) on both sides.

3. A switching device according to claim 2, characterized in that, The first component (11) is an arc-shaped structure that bends from the first protrusion (111) to the second protrusion (112).

4. A switching device according to claim 2, characterized in that, The second component (22) is a strip structure with a U-shaped cross section, which wraps the bottom and sides of the support (21). The part of the outer wall of the second component (22) that abuts against the first component (11) is always located inside the enclosure (114).

5. A switching device according to claim 2, characterized in that, The upper side of the third component (31) is provided with a plurality of slots (311) for setting arc-extinguishing grid plates (33). The inner walls of the two block structures of the third component (31) are provided with opening slots (312) that match the enclosure (114) of the first component (11). The enclosures (114) on both sides of the first component (11) are respectively placed in the two opening slots (312).

6. A switching device according to claim 1, characterized in that, The fourth component (32) has a bending structure.

7. A switching device according to claim 1, characterized in that, The stationary contact system (2) also includes a stationary busbar (28), a corner plate (25), and a component five (26). The support (21) is set on the upper side of the stationary busbar (28) through the corner plate (25). The first stationary contact (27) is set on the side of the stationary busbar (28) facing the moving contact system (1). The component five (26) wraps around the partially exposed stationary busbar (28) and the corner plate (25).

8. A switching device according to claim 1, characterized in that, The arc extinguishing assembly (3) also includes a side plate (37), a baffle (34), and a cover plate (35); the side plate (37) includes two, which are respectively disposed on the outside of the two block structures of the component three (31); the lower side of the baffle (34) is provided with an air port and a slot for setting the arc extinguishing grid plate (33); the cover plate (35) is fastened to the top of the baffle (34) and the side plate (37).

9. A switching device according to claim 8, characterized in that, The arc extinguishing component (3) also includes a free mesh plate (36), and the upper side of the baffle (34) is provided with a square groove for placing the free mesh plate (36).

10. A switching device according to claim 1, characterized in that, The arc-extinguishing grid (33) includes two sets of grids of different sizes, which are respectively disposed above the moving contact system (1) and the stationary contact system (2).

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