Arc extinguish chamber

Abstract

An arc extinguish chamber belongs to the technical field of low-voltage apparatuses. Which comprises a pair of side walls, a grid piece located between the pair of side walls and a deionization device located at an air outlet of the grid piece, the deionization device comprises deionization assemblies, and is characterized in that the number of the deionization assemblies is at least two, the deionization assemblies are arranged in a stacked mode, each deionization assembly comprises a deionization support, and each deionization support comprises a keel and a frame body; the keel protrudes downwards from the frame body, the metal net plate of the deionization assembly is contained in the frame body, and the keel on the deionization support on the upper layer is embedded into the containing cavity of the frame body on the deionization support on the lower layer to form close fit. The device has the advantages that the airtightness of the arc extinguish chamber is improved, and arc gas is prevented from leaking to the outside to form external breakdown; and the cooling effect of gas and the surface compounding effect of charged ions can be enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of low-voltage electrical apparatus, and particularly relates to an arc-extinguishing chamber. BACKGROUND

[0002] Switches, especially disconnectors, are important low-voltage electrical apparatuses, which realize the on-off control of the current carrying to meet the management of the power supply network.

[0003] With the development of new energy, the high-voltage application scenarios of frame circuit breakers (or disconnectors) are increasing. As the arc extinguishing device of the switch, the arc-extinguishing chamber also faces great challenges. The arc-extinguishing chamber usually has an arc extinction assembly inside, which is used for arc gas extinction processing. The existing arc extinction layer structure generally adopts a multi-layer metal mesh stack to be stacked and compressed into an arc extinction mesh assembly. If the arc extinction effect needs to be further improved on this structure, the number of mesh stacks often needs to be increased, which will increase the flow resistance of the arc extinction assembly, cause the arc to move slowly upward, cause the contact system and the arc extinguishing system to be severely burned, and even cause the consequences of failure to break. At the same time, the arc extinction layer structure of the existing structure often has no sealing structure with the rest of the arc-extinguishing chamber, which will cause high-temperature gas or charged ions to overflow outward without passing through the arc extinction assembly, causing the risk of external breakdown.

[0004] In view of the above prior art, it is necessary to reasonably improve the structure of the arc extinction device inside the existing arc-extinguishing chamber. For this purpose, the applicant has made a beneficial design, and the technical scheme to be introduced below is generated in this background. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing an arc-extinguishing chamber, which comprises at least two layers of arc extinction assemblies arranged in a stack, the keel of the upper arc extinction assembly is embedded into the frame of the lower arc extinction assembly to form a close fit, improve the air tightness of the arc-extinguishing chamber, and prevent arc gas from leaking to the outside to form external breakdown.

[0006] The utility model achieves the purpose by providing an arc-extinguishing chamber, which comprises a pair of side walls, a grid plate between the pair of side walls, an arc extinction device at the gas outlet of the grid plate, the arc extinction device comprising an arc extinction assembly, the arc extinction assembly being at least two and arranged in a stack, the arc extinction assembly comprising an arc extinction support and a metal mesh plate, the arc extinction support comprising a keel and a frame, the keel protruding downward from the frame, the frame containing the metal mesh plate, the keel on the upper arc extinction support being embedded into the containing cavity of the frame on the lower arc extinction support to form a close fit.

[0007] In one specific embodiment of the utility model, the keel is integrally formed with the frame body, the keel has a plurality of support ribs, the plurality of support ribs are arranged alternately, and the keel separates the metal mesh plates on adjacent layers of the deionization assembly.

[0008] In another specific embodiment of the utility model, the deionization assembly further comprises an insulating plate assembly, the insulating plate assembly is located above the grid, the deionization assembly is located above the insulating plate assembly, the insulating plate assembly comprises a hole plate and an insulating support located above the hole plate, the insulating support is internally hollow, the keel of the deionization assembly at the bottom is embedded into the hollow cavity in the insulating plate assembly, and tight fit is formed.

[0009] In still another specific embodiment of the utility model, the hole plate and the insulating support are integrally formed.

[0010] In still another specific embodiment of the utility model, abutting edges are further arranged on the inner walls of the left and right sides of the insulating support, and the keel of the deionization assembly at the bottom abuts against the abutting edges.

[0011] In still another specific embodiment of the utility model, the hole plate has a ventilation hole and an embedding hole, the ventilation hole is used for ventilation, the embedding hole is used for cooperation with the grid, the ventilation hole is a through hole, and the embedding hole is a counterbore.

[0012] In still another specific embodiment of the utility model, a step edge is arranged on the inner side of a pair of side walls, the hole plate is located in the interior of the insulating support in projection, a first recess cavity is formed around the hole plate, and the step edge is in tight fit with the first recess cavity of the insulating plate assembly.

[0013] In still another specific embodiment of the utility model, after a pair of side walls are close to each other and spliced, the step edges on the pair of side walls form a square frame shape.

[0014] In still another specific embodiment of the utility model, the arc extinguishing chamber further comprises an arc extinguishing chamber cover, the arc extinguishing chamber cover is located at the top of the arc extinguishing chamber, the arc extinguishing chamber cover comprises an air outlet hole and a convex edge, the air outlet hole is used for the outflow of gas in the arc extinguishing chamber, the convex edge protrudes downward from the arc extinguishing chamber cover, the convex edge is inserted into the containing cavity of the frame of the upper deionization support located below the arc extinguishing chamber cover, and tight fit is formed.

[0015] In still another specific embodiment of the utility model, the convex edge is in a square frame shape, and the arc extinguishing chamber cover further comprises a boss, and the boss is pressed above the metal mesh plate in the containing cavity.

[0016] The arc-extinguishing chamber comprises at least two layers of the deionization assemblies arranged in a stack, the keel of the deionization assembly of the upper layer is embedded into the frame of the deionization assembly of the lower layer, a tight fit is formed, the air tightness of the arc-extinguishing chamber is improved, and the arc gas is prevented from leaking to the outside to form external breakdown. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0018] Figure 2 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0019] Figure 3 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0020] Figure 4 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0021] Figure 5 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0022] Figure 6 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0023] Figure 7 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0024] Figure 8 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0025] Figure 9 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0026] Figure 10 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0027] Figure 11 The utility model discloses a contact and the structural diagram of arc-extinguishing chamber of schematic diagram of the utility model discloses a contact and the structural diagram of arc-extinguishing chamber are shown in the figure.

[0028] In the diagram: 1. Side wall, 11. Step edge; 2. Grid plate, 21. Positioning notch, 22. Arc pulling notch, 23. Positioning recess, 24. Snap-in boss; 3. Arc extinguishing chamber cover, 31. Air outlet, 32. Protruding edge, 33. Boss; 4. Gas generating component, 41. Left gas generating component, 42. Right gas generating component; 5. Deionization device, 51. Deionization component, 511. Deionization bracket, 5111. Keel, 5 112. Frame; 5113. Second cavity; 512. Metal mesh plate; 52. Insulating plate assembly; 521. Perforated plate; 5211. Vent hole; 5212. Embedded hole; 522. Insulating bracket; 523. First cavity; 524. Abutment edge; 6. Moving arc-starting plate; 7. Insulating sleeve; 10. Moving contact; 20. Stationary contact; 30. Arc-extinguishing chamber; 100. Positioning component; 200. Mounting rod. Detailed Implementation

[0029] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0030] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the positions shown in the corresponding figures. They are merely for the purpose of describing the technical solution provided by this utility model in conjunction with the figures and simplifying the description. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0031] like Figure 1 The switch includes a contact system comprising a moving contact 10 and a stationary contact 20. The moving contact 10 rotates to contact or separate from the stationary contact 20. The contact system is installed inside the switch housing, typically within a contact cavity.

[0032] An arc-extinguishing chamber 30 is provided above the moving contact 10 and the stationary contact 20. When the moving contact 10 and the stationary contact 20 are separated, an electric arc is generated. The electric arc enters the arc-extinguishing chamber 30 and is extinguished inside the arc-extinguishing chamber 30.

[0033] like Figure 2 , Figure 3 This is a schematic diagram of the arc-extinguishing chamber 30. The arc-extinguishing chamber 30 includes a pair of sidewalls 1, grid plates 2, and an arc-extinguishing chamber cover 3. Multiple grid plates 2 are arranged in an array spaced apart between the pair of sidewalls 1. The arc-extinguishing chamber cover 3 is located at the top of the arc-extinguishing chamber 30 and has ventilation holes. The pair of sidewalls 1 and the arc-extinguishing chamber cover 3 constitute the outer shell of the arc-extinguishing chamber 30.

[0034] In the embodiment, the pair of side walls 1 are fastened by screws after splicing, and the arc-extinguishing chamber cover 3 is fixed on the top of the pair of side walls 1 from above, and is also fastened by screws.

[0035] Generally, the side walls 1 and the arc-extinguishing chamber cover 3 are made of thermosetting material, such as DMC or BMC. In order to meet the requirements of the material and the process, a plurality of process cavities are provided on the outer side of the side walls 1.

[0036] The arc-extinguishing chamber 30 further comprises a pair of gas generating members 4, i.e. a left gas generating member 41 and a right gas generating member 42. The left gas generating member 41 and the right gas generating member 42 respectively wrap a corresponding one of a pair of grid legs of the grid 2. When the gas generating members 4 are installed, an arc passage is formed between the left gas generating member 41 and the right gas generating member 42, which forms a narrow gap structure in the embodiment.

[0037] The grids 2 are a plurality of grids, which are spaced apart and arranged in parallel. In the embodiment, the grids 2 have a plurality of types, which are arranged in a plurality of grid groups according to design requirements, and the plurality of grid groups are arranged in sequence to form the illustrated grid group.

[0038] The grid 2 comprises a cutting zone and a pair of grid legs, which extend downward from both sides of the cutting zone. The cutting zone is used for cutting the arc to increase the arc voltage. The pair of grid legs is used for providing a magnetic field to pull the arc into the cutting zone.

[0039] In combination Figure 4 The grid 2 has positioning notches 21 on both sides, which are located on both sides in the width direction of the grid 2, and are used for cooperating with the positioning member 100 for installation. Preferably, the positioning notches 21 are located on both outer sides of the pair of grid legs. In terms of the height direction of the arc-extinguishing chamber 30, the positioning notches 21 on both sides are at the same height.

[0040] The cutting zone is provided with an arc-pulling notch 22 at a position corresponding to the pair of grid legs. In the embodiment, the arc-pulling notch 22 is triangular. Of course, the shape of the arc-pulling notch 22 can be changed, such as a multi-layered arch-shaped notch. The arc-pulling notch 22 is offset with respect to the center line in the height direction of the grid 2. Thus, when the arc-pulling notches 22 of adjacent grids 2 are offset in different directions, the arc on the grid 2 can be pulled to facilitate arc extinction.

[0041] A positioning recess 23 is arranged on one side of the arc drawing gap 22. The positioning recess 23 on one side of the arc drawing gap 22 is used for positioning cooperation with the gas generating member 4. Since there is only one positioning recess 23 on one grid sheet 2, and the positioning recess 23 on the adjacent grid sheet 2 is arranged on the other side, the positioning recess 23 can be positioned and cooperated with the left gas generating member 41 and the right gas generating member 42.

[0042] A clamping boss 24 is arranged on one side of the grid sheet 2, i.e. the top of the grid sheet 2. The clamping boss 24 is clamped and cooperated with the arc extinguishing device 5 arranged above the grid sheet 2.

[0043] A mounting rod 200 is arranged on a pair of grid legs of the grid sheet 2 arranged in the middle of the grid sheet array. Specifically, the mounting rod 200 is a pair of mounting rods. The mounting rod 200 is used for positioning the corresponding grid sheet 2 and the gas generating member 4, and the gas generating member 4 is connected with a pair of side walls 1 through fasteners.

[0044] See Figure 3 and Figure 11 , the arc extinguishing chamber 30 further comprises an arc extinguishing device 5 arranged at the gas outlet of the grid sheet 2 and between the grid sheet 2 and the arc extinguishing chamber cover 3, which is used for arc gas extinguishing and preventing arc flying. The arc extinguishing device 5 comprises an arc extinguishing assembly 51 and an insulating plate assembly 52. The arc extinguishing assembly 51 is internally provided with a metal mesh plate 512. The clamping boss 24 is embedded in the insulating plate assembly 52. Therefore, the cooperation between the clamping boss 24 and the insulating plate assembly 52 can position the grid sheet 2 and prevent the grid sheet 2 from shaking.

[0045] More specifically, the insulating plate assembly 52 is arranged above the grid sheet 2, and the arc extinguishing assembly 51 is arranged above the insulating plate assembly 52. In this embodiment, the arc extinguishing assembly 51 is two, and the insulating plate assembly 52 is also two, which are stacked respectively, and the stacked arc extinguishing assembly 51 is arranged above the stacked insulating plate assembly 52.

[0046] The arc extinguishing chamber 30 further comprises a movable arc drawing sheet 6 corresponding to the movable contact 10, which guides the electric arc into the grid sheet 2 of the array.

[0047] In order to improve the insulation, the arc extinguishing chamber 30 further comprises an insulating sleeve 7 arranged in a pair of side walls 1, and the screws for fixing the pair of side walls 1 pass through the insulating sleeve 7 to realize screw fixing. The insulating sleeve 7 can prevent the arc gas from contacting the screws and prevent breakdown from occurring.

[0048] As Figure 5 , Figure 6 ,Figure 7 , and in combination Figure 3 , and in combination Fig. 5 is a schematic view of an insulation plate assembly 52. The insulation plate assembly 52 comprises a hole plate 521 and an insulation support 522 above the hole plate 521, and the hole plate 521 is between the insulation support 522 and the grid sheet 2. The insulation support 522 is in the shape of a frame. The inner side of a pair of side walls 1 has a step 11, and when the pair of side walls 1 are closed to each other, the steps 11 on the pair of side walls 1 form a square frame, and the insulation support 522 is in abutment with the steps 11, and the steps 11 support the insulation support 522. In this embodiment, the hole plate 521 and the insulation support 522 are integrally formed. Since the projection of the hole plate 521 on the insulation support 522 is inside the insulation support 522, a first recess 523 is formed around the hole plate 521. The first recess 523 is in embedded abutment with the steps 11, so that the gap becomes a bending gap, which can better block the gas flow and achieve better sealing effect. The inner walls on the left and right sides of the insulation support 522 are provided with abutment edges 524, and the inside of the insulation support 522 is a hollow cavity.

[0049] The hole plate 521 is in the shape of a rectangle, and has a plurality of air holes 5211, which are arranged on the hole plate 521 and uniformly distributed on the hole plate 521, and the air holes 5211 are used for air ventilation. The hole plate 521 also has embedded holes 5212. The embedded holes 5212 are used for embedding the clamping bosses 24, so as to position the grid sheet 2 on the top of the grid sheet 2. Preferably, the embedded holes 5212 are in the shape of square cones.

[0050] The air holes 5211 are through holes, and the embedded holes 5212 are counterbores.

[0051] In this embodiment, one grid sheet 2 has only one clamping boss 24, and correspondingly, the hole plate 521 also has only one embedded hole 5212 corresponding to the clamping boss 24 of one grid sheet 2. In the array direction of the grid sheets 2, adjacent embedded holes 5212 are arranged staggered.

[0052] As Figure 8 , Figure 9 In combination Figure 11Fig. 3 is a schematic view of the ionization elimination assembly 51. The ionization elimination assembly 51 comprises an ionization elimination bracket 511 and a metal mesh plate 512. The metal mesh plate 512 is arranged in the ionization elimination bracket 511 as a component for adsorbing charged particles. The ionization elimination assembly 51 is arranged in at least two layers. In this embodiment, the ionization elimination assembly 51 is arranged in two layers. In the upper layer, the holes of the metal mesh plate 512 are smaller than those in the lower layer.

[0053] The ionization elimination bracket 511 comprises a keel 5111 and a frame 5112. Preferably, the keel 5111 and the frame 5112 are integrally formed. The keel 5111 is located below the frame 5112, i.e., the keel 5111 is located on the side of the frame 5112 closer to the grid 2. In other words, the keel 5111 protrudes downward from the frame 5112. The keel 5111 has a plurality of support ribs arranged in a staggered manner. When the ionization elimination assembly 51 in the lower layer is installed in place, the keel 5111 in the lower layer separates the mesh plate 521 from the metal mesh plate 512, and the keel 5111 in the lower layer abuts against the abutting edge 524. Meanwhile, the keel 5111 in the upper layer separates the metal mesh plate 512 in the adjacent layer.

[0054] A receiving cavity is formed in the frame 5112 to accommodate the metal mesh plate 512. A second recessed cavity 5113 is formed around the keel 5111. The frame 5112 cooperates with the second recessed cavity 5113 in the upper layer to achieve better sealing, i.e., the frame 5112 in the lower layer is embedded in the second recessed cavity 5113 in the upper layer. The gap is changed into a bending gap, which can better block the flow of gas and achieve better sealing effect.

[0055] As shown in Fig. 3, Figure 10 Fig. 4 is a schematic view of the arc-extinguishing chamber cover 3. The arc-extinguishing chamber cover 3 comprises an air outlet hole 31, a protruding edge 32, and a boss 33. The air outlet hole 31 is used for the gas in the arc-extinguishing chamber to flow out. The protruding edge 32 is in the shape of a square box. The protruding edge 32 protrudes downward from the arc-extinguishing chamber cover 3 and cooperates with the frame 5112 of the ionization elimination bracket 511 in the upper layer below the arc-extinguishing chamber cover 3, i.e., the protruding edge 32 is inserted into the receiving cavity of the frame 5112 to achieve better sealing. The boss 33 is arranged above the metal mesh plate 512 in the receiving cavity.

[0056] As shown in Fig. 4, Figure 11 The utility model aims at improving the sealing performance of the arc-extinguishing chamber 30 and preventing the arc gas from flowing out of the arc-extinguishing chamber through the gaps around the arc-extinguishing chamber, thereby preventing external breakdown.

[0057] The following several parts can be superimposed on each other, or can be used alone, which can improve the air tightness of the arc extinguishing chamber 30. The following is described in the order from bottom to top.

[0058] The first sealing structure is the cooperation and installation structure between the insulating plate assembly 52 installed on the gas outlet side of the grid sheet 2 and the side wall 1. Specifically, the steps along 11 on the inner side of the pair of side walls 1 are embeddedly fitted between the first recessed cavity 523 of the insulating plate assembly 52, and the cooperation can prevent arc gas from leaking from there, thereby improving the air tightness when the two are cooperatively installed. Preferably, the embedded fitting at this position is a tight fit.

[0059] The second sealing structure is the cooperation and installation structure between the insulating plate assembly 52 and the arc extinguishing assembly 51. Specifically, the keel 5111 of the arc extinguishing assembly 51 is embedded into the hollow cavity inside the insulating support 522 of the insulating plate assembly 52. The inner wall on the left and right sides of the insulating support 522 is also provided with an abutting along 524, and the end face of the keel 5111 is abutted and cooperated with the abutting along 524, and the outer edge of the insulating support 522 is inserted into the second recessed cavity 5113 around the keel 5111, which is also formed as an embedded fit, and the cooperation can prevent arc gas from leaking from there, thereby improving the air tightness when the two are cooperatively installed. Preferably, the embedded fitting at this position is a tight fit.

[0060] The third sealing structure is between the arc extinguishing assemblies 51 adjacent in the up-down direction, or between the stacked arc extinguishing assemblies 51. Specifically, the sealing structure between the arc extinguishing support 511 of the upper layer and the arc extinguishing support 511 of the lower layer. The keel 5111 on the arc extinguishing support 511 of the upper layer is embedded into the accommodating cavity of the frame body 5112 on the arc extinguishing support 511 of the lower layer, so that the frame body 5112 of the lower layer is embedded into the second recessed cavity 5113 around the keel 5111 of the upper layer, which is also formed as an embedded fit, and the cooperation can prevent arc gas from leaking from there, thereby improving the air tightness when the two are cooperatively installed. Preferably, the embedded fitting at this position is a tight fit.

[0061] The fourth sealing structure is between the arc extinguishing chamber cover 3 and the arc extinguishing assembly 51 below it. Specifically, the convex edge 32 on the arc extinguishing chamber cover 3 is inserted into the accommodating cavity of the frame body 5112 of the arc extinguishing support 511 of the arc extinguishing assembly 51, which is also formed as an embedded fit, and the cooperation can prevent arc gas from leaking from there, thereby improving the air tightness when the two are cooperatively installed. Preferably, the embedded fitting at this position is a tight fit.

Claims

1. An arc extinguishing chamber comprising a pair of side walls (1), a grid (2) located between the pair of side walls (1), a deionization device (5) located at the gas outlet of the grid (2), the deionization device (5) comprising a deionization assembly (51), characterized in that: The deionization assembly (51) is at least two and stacked, the deionization assembly (51) includes a deionization support (511) and a metal mesh plate (512), the deionization support (511) includes a keel (5111) and a frame (5112), the keel (5111) protrudes downward from the frame (5112), the frame (5112) contains the metal mesh plate (512), the keel (5111) on the upper deionization support (511) is embedded into the containing cavity of the frame (5112) on the lower deionization support (511), and a tight fit is formed.

2. An arc chamber according to claim 1, characterized in that: The keel (5111) is integrally formed with the frame (5112), a plurality of support ribs are formed on the keel (5111), the plurality of support ribs are staggered, and the keel (5111) separates the metal mesh plates (512) on the adjacent layers of deionization assemblies (51).

3. An arc quenching chamber according to claim 1, characterized in that: The deionization assembly (51) further includes an insulation plate assembly (52), the insulation plate assembly (52) is located above the grid sheet (2), the deionization assembly (51) is located above the insulation plate assembly (52), the insulation plate assembly (52) includes a hole plate (521) and an insulation support (522) located above the hole plate (521), the insulation support (522) is a hollow cavity inside, the keel (5111) of the bottom deionization assembly (51) is embedded into the hollow cavity inside the insulation plate assembly (52), and a tight fit is formed.

4. An arc chamber according to claim 3, characterized in that: The hole plate (521) is integrally formed with the insulation support (522).

5. An arc quenching chamber according to claim 3, characterized in that: The inner walls on the left and right sides of the insulation support (522) are further provided with abutting edges (524), and the keel (5111) of the bottom deionization assembly (51) abuts on the abutting edges (524).

6. An arc quenching chamber according to claim 3, characterized in that: The hole plate (521) has a ventilation hole (5211) and an embedding hole (5212), the ventilation hole (5211) is used for ventilation, and the embedding hole (5212) is used for cooperation with the grid sheet (2), the ventilation hole (5211) is a through hole, and the embedding hole (5212) is a counterbore.

7. An arc quenching chamber according to claim 3, characterized in that: The inner side of a pair of side walls (1) has a step edge (11), the hole plate (521) is located inside the insulation support (522) in the projection of the insulation support (522), a first recess (523) is formed around the hole plate (521), and the step edge (11) is tightly matched with the first recess (523) of the insulation plate assembly (52).

8. An arc chamber according to claim 7, characterized in that: After a pair of side walls (1) are close to each other and spliced, the step edges (11) on the pair of side walls (1) form a square frame.

9. An arc quenching chamber as claimed in claim 1, characterized in that: The arc extinguishing chamber (30) further comprises an arc extinguishing chamber cover (3) located at the top of the arc extinguishing chamber (30), wherein the arc extinguishing chamber cover (3) comprises a gas outlet hole (31) for the gas in the arc extinguishing chamber to flow outwards and a protruding edge (32) which protrudes downwards from the arc extinguishing chamber cover (3) and is inserted into a containing cavity of a frame (5112) of the upper-layer arc extinction support (511) below the arc extinguishing chamber cover (3) to form a close fit.

10. An arc chamber according to claim 9, characterized in that: The protruding edge (32) is in the shape of a square frame, and the arc extinguishing chamber cover (3) further comprises a boss (33) which is pressed above a metal mesh plate (512) in the containing cavity.

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