CN212485260U

CN212485260U - Arc extinguishing chamber

Info

Publication number: CN212485260U
Application number: CN202021409586.4U
Authority: CN
Inventors: 田文伟
Original assignee: Beijing Sanlaite Electromechanical Equipment Co Ltd
Current assignee: Beijing Sanlaite Electromechanical Equipment Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-02-05
Anticipated expiration: 2030-07-16

Abstract

The application relates to an arc extinguishing cover, which belongs to the field of electrical equipment and aims to solve the problems that the existing arc extinguishing cover is inconvenient to install arc extinguishing grid pieces and can cause damage to the arc extinguishing grid pieces; a positioning component used for fixing the first side plate and the second side plate is arranged between the first side plate and the second side plate; clamping plates are respectively arranged on the side surfaces of the arc extinguishing grid plate, which are attached to the first side plate and the second side plate; the side surfaces opposite to the first side plate and the second side plate are respectively provided with a clamping groove corresponding to the clamping plates. The arc extinguishing grid piece installing device has the advantages that the arc extinguishing grid piece is installed conveniently, and the effect that the arc extinguishing grid piece is damaged possibly is reduced.

Description

Arc extinguishing chamber

Technical Field

The application relates to the field of electrical equipment, in particular to an arc extinguishing chamber.

Background

The arc extinguishing cover is one of the important component parts of the circuit breaker, contains in the medium around switch electrical apparatus contact itself and the contact a large amount of can by free electron, when disconnected contact spare exists enough big voltage, can form electric arc, produce the destruction to the contact easily, can make open circuit's time extension, danger may appear, make circuit or electrical apparatus burn out the phenomenon, the arc extinguishing cover is one kind promptly through letting electric arc and solid medium contact, reduce the electric arc temperature, thereby the device that electric arc extinguishes with higher speed.

The patent document with the current publication number of CN204045529U discloses an arc extinguishing cover, including electric arc spout and a plurality of arc mouth board, the electric arc spout is integrated into one piece's cell body structure, and the electric arc spout includes a roof and two curb plates that set up respectively perpendicularly in the roof both sides, is provided with a plurality of through-hole on the roof, all is provided with a plurality of mounting hole on two curb plates, a plurality of arc mouth boards on all be provided with the recess that is the U-shaped, and the both sides of each arc mouth correspond each mounting hole department all be provided with the dop of looks adaptation, each arc mouth board on the dop constitute the riveting with the mounting hole on two curb plates and be connected.

To the correlation technique among the above-mentioned, the inventor thinks, when installing the arc extinguishing bars piece between the board of both sides, insert the arc extinguishing bars piece respectively in the shell, need insert the arc extinguishing bars piece hard, the installation is harder, insert the in-process hard, the phenomenon of damage can appear leading to the fact to arc extinguishing bars piece or shell, in addition, operating personnel inserts the arc extinguishing bars piece hard in the shell, the phenomenon of injury can appear leading to the fact to operating personnel in the arc extinguishing bars piece, follow-up in the use of arc extinguishing chamber, the arc extinguishing bars piece appears damaging and need be changed its under the condition, it is also more inconvenient to dismantle the arc extinguishing bars piece, it is comparatively troublesome with the process of changing to install the arc extinguishing piece, the damage appears easily.

SUMMERY OF THE UTILITY MODEL

In order to install and change comparatively convenient arc extinguishing bars piece, this application provides an arc extinguishing chamber.

The application provides an arc extinguishing chamber adopts following technical scheme:

an arc extinguishing shield comprises a shell, wherein a plurality of arc extinguishing grid pieces which are arranged in parallel are arranged in the shell, the shell comprises a first side plate and a second side plate, a connecting piece used for connecting and fixing the first side plate and the second side plate is arranged between the first side plate and the second side plate, and the first side plate and the second side plate are hinged through the connecting piece; a positioning component used for fixing the first side plate and the second side plate is arranged between the first side plate and the second side plate; clamping plates are respectively arranged on the side surfaces of the arc extinguishing grid plate, which are attached to the first side plate and the second side plate; the side surfaces opposite to the first side plate and the second side plate are respectively provided with a clamping groove corresponding to the clamping plates.

By adopting the technical scheme, in the process of installing the arc extinguishing grid plate, the fixing of the positioning assembly to the first side plate and the second side plate is firstly released, the second side plate is rotated, so that the first side plate and the second side plate do not form shielding with each other any more, the arc extinguishing grid pieces are respectively arranged on the first side plate, so that the clamping plates are inserted into the corresponding clamping grooves, then the second side plate is rotated to clamp the arc extinguishing grid pieces into the clamping grooves on the second side plate, the first side plate and the second side plate are fixed through the positioning assembly to complete the installation of the arc extinguishing grid plate, when the arc extinguishing grid plate is installed in the shell, the arc extinguishing grid pieces do not need to be inserted by force, the phenomenon that the arc extinguishing grid pieces or the shell are damaged when the arc extinguishing grid pieces are inserted into the shell by force can be reduced, and the phenomena that operators are scratched and the like in the process of forceful insertion can be reduced, and the process of installing the arc-extinguishing grid pieces is more convenient.

Preferably, the number of the connecting pieces is two, the connecting pieces are respectively arranged at the end parts corresponding to the two ends of the first side plate and the second side plate, and each connecting piece comprises a connecting column arranged on the first side plate and a connecting plate arranged at the position, corresponding to the connecting column, on the second side plate; the connecting plate is connected with the connecting column in a sliding mode and can rotate relative to the connecting column.

Through adopting above-mentioned technical scheme, when installing arc extinguishing bars piece in-process with the second curb plate lock, at first rotate the second curb plate and make cardboard on the arc extinguishing bars piece align with the draw-in groove that corresponds on the second curb plate, later slide the second curb plate to the direction towards first curb plate for the cardboard inlays in corresponding the draw-in groove, and fix first curb plate and second curb plate, can guarantee cardboard and corresponding draw-in groove complex tightness, reduce the phenomenon that the cardboard appears rocking in the draw-in groove.

Preferably, a connecting rod is arranged on the side face, which is attached to the connecting column, of the connecting plate, a limiting column is arranged at the end of the connecting rod, the diameters of the connecting rod and the limiting column are circular respectively, and the diameter of the cross section of the limiting column is larger than that of the connecting rod; the connecting column is provided with a chute, the section of the chute is in a T shape, and the width of the notch is greater than that of the bottom of the chute; the limiting column is embedded at the bottom of the sliding chute, and the connecting rod penetrates out of the notch of the sliding chute; the size of the section of the connecting rod is smaller than the width of the groove opening of the sliding groove; the connecting rod is provided with a limiting block which is rectangular and is attached to two side walls of the notch of the sliding groove; the one end that first curb plate was kept away from to the spout notch has seted up the holding tank.

Through adopting above-mentioned technical scheme, adjust second curb plate to preset position, slide to it and make during the cardboard embedding corresponding draw-in groove, the stopper is located the notch of spout, prescribes a limit to the second curb plate, and the second curb plate pivoted phenomenon appears in the slip in-process in the reduction, and the phenomenon that the reduction appears causing the damage to the arc extinguishing bars piece because of the second curb plate rotates.

Preferably, the end that spout notch and holding tank meet opens to both sides, forms a flaring structure.

Through adopting above-mentioned technical scheme, when the second curb plate that slides makes the stopper slip from holding the groove and get into the spout notch for the process that the stopper slip got into the spout notch is comparatively convenient, reduces to appear stopper and spout lateral wall butt and inconvenient slip the phenomenon that gets into the spout notch with the stopper.

Preferably, the notches of the clamping grooves are opened towards two sides to form a flaring structure.

Through adopting above-mentioned technical scheme, when installing first curb plate and fixing the arc extinguishing bars piece through rotating the second curb plate with the arc extinguishing bars piece, the cardboard can be comparatively convenient insert the draw-in groove that corresponds, and the comparison is convenient to aim at.

Preferably, the positioning assembly comprises a positioning plate and a limiting plate, one end of the positioning plate is connected to the first side plate, the limiting plate is arranged on the end portion, far away from the first side plate, of the positioning plate, and the limiting plate is attached to one side, far away from the first side plate, of the second side plate; a convex edge is arranged on the second side plate, and the limiting plate is attached to the convex edge.

Through adopting above-mentioned technical scheme, adjustment second curb plate makes its arc extinguishing bars piece to the cooperation of first curb plate fix the back, slides the direction of locating plate orientation protruding edge, and the one end and the first curb plate of locating plate are connected, and the limiting plate pastes mutually with the side of second curb plate, and the position department that sliding location board pasted mutually to limiting plate and protruding edge fixes first curb plate and second curb plate, fixes comparatively convenient to it.

Preferably, the positioning assembly further comprises a positioning member arranged on the second side plate, and the positioning member comprises a stop block connected to the second side plate in a sliding manner and a spring arranged between the stop block and the second side plate; the second side plate is provided with an installation groove, the stop block is arranged in the installation groove, the spring is positioned in the installation groove, and two ends of the spring are respectively connected with the stop block and the bottom of the installation groove; the side surface of the stop block, which is positioned outside the second side plate, is provided with an inclined surface, and the inclined surface faces to the direction away from the convex edge.

Through adopting above-mentioned technical scheme, when fixing first curb plate and second curb plate, the locating plate slides to dog position department, and the locating plate drives the dog and slides to the mounting groove in with the inclined plane butt of dog, and the locating plate slides to between dog and the protruding edge, fixes the locating plate, can guarantee the stability fixed to first curb plate and second curb plate.

Preferably, the positioning plate is connected with the first side plate in a sliding mode, a sliding column is arranged at the end of the positioning plate, a blocking column is arranged at the end of the sliding column, the sections of the sliding column and the blocking column are circular respectively, and the diameter of the blocking column is larger than that of the sliding column; a T-shaped groove is formed in the side face of the first side plate, the blocking column is embedded at the bottom of the T-shaped groove, and the sliding column penetrates out of the notch of the T-shaped groove; one end of the T-shaped groove far away from the convex edge is bent towards the direction of the second side plate.

By adopting the technical scheme, when the contact is fixed to the first side plate and the second side plate, the stop block is pressed to enable the stop block to be embedded into the mounting groove, the positioning plate slides in the direction away from the convex edge, the positioning plate slides in the direction towards the second side plate after sliding to the end part, the positioning plate is rotated to enable the limiting plate to be separated from the second side plate, the position of the second side plate is adjusted, and the first side plate and the second side plate are fixed and the fixing operation of the first side plate and the second side plate is released conveniently.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the arc-extinguishing grid pieces are installed, the positions of the second side plates are adjusted, the arc-extinguishing grid pieces can be conveniently inserted into the corresponding clamping grooves, the arc-extinguishing grid pieces do not need to be forcibly inserted during installation, the phenomenon that the arc-extinguishing grid pieces or the shell are damaged is reduced, meanwhile, the phenomenon that operating personnel are carelessly injured can be reduced, and the processes of installing the arc-extinguishing grid pieces and subsequently replacing the arc-extinguishing grid pieces are convenient;

2. through the locating component who sets up, slide the locating plate towards the direction of protruding edge, extrude the dog and make in the dog embedding mounting groove, locating plate and dog separation back, the dog pops out from the mounting groove under the effect of spring, fixes the locating plate, and it is more convenient to carry out the operation of fixing to first curb plate and second curb plate promptly, and is comparatively stable fixed to it.

Drawings

Figure 1 is a schematic view of an arc chute;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a sectional view for showing the structure of the connecting member;

FIG. 4 is a schematic view of an installation structure of an arc chute;

FIG. 5 is an enlarged schematic view of portion B of FIG. 4;

FIG. 6 is a schematic view illustrating a structure of the receiving groove;

FIG. 7 is a schematic view of the positioning assembly;

FIG. 8 is a sectional view for showing the structure of the spacer;

fig. 9 is an enlarged schematic view of a portion C in fig. 8.

Description of reference numerals: 1. a housing; 11. a first side plate; 111. a T-shaped slot; 12. a second side plate; 121. mounting grooves; 13. a card slot; 2. a connecting member; 21. connecting columns; 211. a chute; 212. accommodating grooves; 22. a connecting plate; 23. a connecting rod; 24. a limiting column; 25. a limiting block; 3. arc extinguishing grid pieces; 31. clamping a plate; 4. a positioning assembly; 41. positioning a plate; 42. a limiting plate; 43. a positioning member; 431. a stopper; 432. a spring; 44. sliding the column; 45. a bumping post; 46. and (4) a convex edge.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

The embodiment of the application discloses an arc extinguishing chamber. Referring to fig. 1, the arc chute includes a housing 1, the housing 1 includes a first side plate 11 and a second side plate 12, and a connecting member 2 for connecting and fixing the first side plate 11 and the second side plate 12 is connected between the first side plate 11 and the second side plate 12; a plurality of arc extinguishing grid pieces 3 are arranged between the first side plate 11 and the second side plate 12, the arc extinguishing grid pieces 3 are arranged in parallel, and two side edges of the arc extinguishing grid pieces are respectively connected to the first side plate 11 and the second side plate 12; two connecting pieces 2 are arranged at two ends of the first side plate 11 and the second side plate 12 respectively; referring to fig. 1 and 3, the connecting piece 2 includes a connecting column 21 fixed on the first side plate 11 and a connecting plate 22 fixed on the second side plate 12 at a position corresponding to the connecting column 21, and the two connecting plates 22 are respectively located on one side of the corresponding connecting column 21 facing the middle of the first side plate 11 and the second side plate 12; connecting rods 23 are respectively arranged on the side faces, which are attached to the connecting columns 21, of the connecting plates 22, the end parts of the connecting rods 23 are respectively fixedly connected with limiting columns 24, the cross sections of the connecting rods 23 and the limiting columns 24 are respectively circular, and the cross section diameter of the limiting columns 24 is larger than that of the connecting rods 23; the connecting column 21 is provided with a sliding groove 211 at a position corresponding to the connecting rod 23 and the limiting column 24, the cross section of the sliding groove 211 is in a T shape, the width of the notch of the sliding groove 211 is smaller than the width of the groove bottom, the limiting column 24 is positioned at the bottom of the groove of the sliding groove 211, the connecting rod 23 penetrates out of the notch of the sliding groove 211, the connecting rod 23 and the limiting column 24 can slide in the sliding groove 211 along the length direction of the sliding groove 211, and the connecting rod 23 and the limiting column 24 can rotate in the sliding groove 211; referring to fig. 1 and 2, a positioning assembly 4 for fixing the first side plate 11 and the second side plate 12 is arranged between the two side plates; referring to fig. 4 and 5, the opposite side surfaces of the first side plate 11 and the second side plate 12 are respectively provided with a clamping groove 13 adapted to the arc-extinguishing grid 3, the corresponding positions on the side edge of the arc-extinguishing grid 3 are respectively and fixedly connected with a clamping plate 31, and the clamping plate 31 is embedded in the corresponding clamping groove 13 to clamp and fix the arc-extinguishing grid 3.

When installing arc extinguishing bars piece 3, at first rotate second curb plate 12, make draw-in groove 13 on the first curb plate 11 be in the state that is not sheltered from, install arc extinguishing bars piece 3 on first curb plate 11, cardboard 31 imbeds respectively in the draw-in groove 13 that corresponds, rotate second curb plate 12 to the position department relative with first curb plate 11, slide second curb plate 12 to the direction of first curb plate 11, make the cardboard 31 of opposite side also imbed in the draw-in groove 13 that corresponds on arc extinguishing bars piece 3, use locating component 4 to fix first curb plate 11 and second curb plate 12, completion that can be comparatively convenient is to the installation of arc extinguishing bars piece 3, it is comparatively laborsaving and simple and convenient to operate, be difficult to appear causing the phenomenon of damage to arc extinguishing bars piece 3.

Referring to fig. 4 and 5, the notches of the card slots 13 are respectively opened towards two sides to form a flaring structure, so that when the card board 31 is inserted into the corresponding card slot 13, alignment can be conveniently performed, and the operation is simple and convenient.

Referring to fig. 3 and 6, the diameter of the connecting rod 23 is smaller than the width of the notch of the sliding groove 211, the connecting rod 23 is fixedly connected with a limiting block 25, the limiting block 25 is rectangular and has a size matched with that of the notch of the sliding groove 211, and the upper side surface and the lower side surface of the limiting block 25 are respectively attached to two side walls at the position of the notch of the sliding groove 211; an accommodating groove 212 is formed in one end, away from the side plate where the corresponding connecting column 21 is located, of the groove opening of the sliding groove 211, and the size of the limiting block 25 is smaller than that of the accommodating groove 212, namely, the limiting block 25 can rotate in the accommodating groove 212; the notch of spout 211 opens to both sides with the one end of holding tank 212 intercommunication, forms a flaring structure for during stopper 25 slides from holding tank 212 and gets into the notch of spout 211, comparatively smooth and easy, the reduction appears stopper 25 and spout 211's notch and has the dislocation and need adjust stopper 25 so that stopper 25 slides smoothly and advance the phenomenon of spout 211 notch.

When adjusting the position of curb plate, if the in-process of pulling first curb plate 11 and the mutual keeping away from of second curb plate 12, the pivoted phenomenon of certain angle can appear first curb plate 11 and the second curb plate 12 emergence, if this moment, cardboard 31 still is located draw-in groove 13, the phenomenon of cardboard 31 department damage can appear promptly, cooperation through stopper 25 and spout 211 notch lateral wall, make the curb plate slide along the rectilinear direction, can guarantee the stability of first curb plate 11 and the removal process of second curb plate 12, it appears pivoted phenomenon to reduce it, can reduce promptly and appear rotating and cause the phenomenon of damage to cardboard 31 and arc extinguishing bars piece 3 because of first curb plate 11 and second curb plate 12.

Referring to fig. 1 and 2, two positioning assemblies 4 are provided, and are respectively disposed at two ends of the side plates, and each positioning assembly 4 includes a positioning plate 41 with one end connected to the first side plate 11, a limiting plate 42 vertically fixed to the other end of the positioning plate 41, and a positioning member 43 disposed on the second side plate 12; referring to fig. 7, a sliding column 44 is fixedly connected to an end of the positioning plate 41, a stop column 45 is fixedly connected to an end of the sliding column 44, the cross sections of the sliding column 44 and the stop column 45 are respectively circular, and the diameter of the stop column 45 is larger than that of the sliding column 44; referring to fig. 1 and 7, a T-shaped groove 111 is formed in the side surface of the first side plate 11, the width of the notch of the T-shaped groove 111 is smaller than the width of the groove bottom, the blocking pillar 45 is embedded in the groove bottom of the T-shaped groove 111, and the sliding pillar 44 penetrates out of the notch of the T-shaped groove 111 to the outer side of the first side plate 11; the limit plate 42 is attached to the side of the second side plate 12.

Referring to fig. 8 and 9, the positioning member 43 includes a stopper 431 slidably connected to the second side plate 12 and a spring 432 disposed between the stopper 431 and the second side plate 12; the second side plate 12 is provided with a mounting groove 121, the stopper 431 is arranged in the mounting groove 121, the spring 432 is arranged between the stopper 431 and the mounting groove 121, and two ends of the spring 432 are respectively connected with the stopper 431 and the groove bottom of the mounting groove 121; the part of the stop 431 positioned at the outer side of the second side plate 12 facing one side of the connecting piece 2 is provided with an inclined surface, and in the process that the positioning plate 41 slides in the direction away from the connecting piece 2, the stop 431 is pressed to enable the stop 431 to be embedded into the mounting groove 121; a flange 46 is fixedly connected to the second side plate 12, and the positioning plate 41 is located between the stopper 431 and the flange 46; referring to fig. 1, an end of the T-shaped groove 111 away from the flange 46 is bent in a direction toward the second side plate 12.

When the positioning assembly 4 is used for fixing the first side plate 11 and the second side plate 12, the first side plate 11 and the second side plate 12 are adjusted to a preset position, the positioning plate 41 is rotated to enable the limiting plate 42 to be attached to the side surface of the second side plate 12, the positioning plate 41 slides in the direction away from the connecting piece 2, the positioning plate 41 is abutted to the side surface of the stop 431, the stop 431 is driven to enable the stop 431 to be embedded into the installation groove 121, the limiting plate 42 slides to a position between the stop 431 and the convex edge 46, the first side plate 11 and the second side plate 12 are fixed, when the first side plate 11 and the second side plate 12 are detached, the stop 431 is pressed to enable the stop 431 to be embedded into the installation groove 121, the positioning plate 41 slides in the direction towards the connecting piece 2, the positioning plate 41 slides in the direction towards the second side plate 12, after the limiting plate 42 slides to the edge of the second side plate 12, the connecting plate 22 is rotated to enable, the operation of fixing and releasing the first side plate 11 and the second side plate 12 is convenient, and the fixing of the first side plate and the second side plate is firm.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an arc extinguishing chamber, includes shell (1), is provided with multi-disc parallel arrangement's arc extinguishing bars piece (3) in shell (1), its characterized in that: the shell (1) comprises a first side plate (11) and a second side plate (12), a connecting piece (2) used for connecting and fixing the first side plate (11) and the second side plate (12) is arranged between the first side plate (11) and the second side plate (12), and the first side plate (11) and the second side plate (12) are hinged through the connecting piece (2); a positioning component (4) used for fixing the first side plate (11) and the second side plate (12) is arranged between the first side plate and the second side plate; clamping plates (31) are respectively arranged on the side surfaces of the arc extinguishing grid plates (3) which are attached to the first side plate (11) and the second side plate (12); the opposite side surfaces of the first side plate (11) and the second side plate (12) are respectively provided with a clamping groove (13) corresponding to the clamping plate (31).

2. An arc chute according to claim 1 wherein: the two connecting pieces (2) are respectively arranged at the corresponding end parts of the two ends of the first side plate (11) and the second side plate (12), and each connecting piece (2) comprises a connecting column (21) arranged on the first side plate (11) and a connecting plate (22) arranged on the second side plate (12) and corresponding to the connecting column (21); the connecting plate (22) is connected with the connecting column (21) in a sliding mode, and the connecting plate (22) can rotate relative to the connecting column (21).

3. An arc chute according to claim 2 wherein: a connecting rod (23) is arranged on the side face, which is attached to the connecting column (21), of the connecting plate (22), a limiting column (24) is arranged at the end part of the connecting rod (23), the diameters of the connecting rod (23) and the limiting column (24) are respectively circular, and the diameter of the cross section of the limiting column (24) is larger than that of the cross section of the connecting rod (23); a connecting column (21) is provided with a sliding chute (211), the section of the sliding chute (211) is T-shaped, and the width of the notch is greater than that of the bottom of the chute; the limiting column (24) is embedded in the bottom of the sliding groove (211), and the connecting rod (23) penetrates out of the notch of the sliding groove (211); the section size of the connecting rod (23) is smaller than the width of the groove opening of the sliding groove (211); the connecting rod (23) is provided with a limiting block (25), the limiting block (25) is rectangular and is attached to two side walls of the notch of the sliding groove (211); an accommodating groove (212) is formed in one end, away from the first side plate (11), of the groove opening of the sliding groove (211).

4. An arc chute according to claim 3 wherein: one end of the groove opening of the sliding groove (211) connected with the accommodating groove (212) is opened towards two sides to form a flaring structure.

5. An arc chute according to claim 1 wherein: the notch of the clamping groove (13) is opened towards two sides to form a flaring structure.

6. An arc chute according to claim 1 wherein: the positioning assembly (4) comprises a positioning plate (41) with one end connected to the first side plate (11) and a limiting plate (42) arranged on the positioning plate (41) and far away from the end part of the first side plate (11), and the limiting plate (42) is attached to one side, far away from the first side plate (11), of the second side plate (12); the second side plate (12) is provided with a convex edge (46), and the limiting plate (42) is attached to the convex edge (46).

7. An arc chute according to claim 6 wherein: the positioning assembly (4) further comprises a positioning part (43) arranged on the second side plate (12), wherein the positioning part (43) comprises a stop block (431) connected to the second side plate (12) in a sliding mode and a spring (432) arranged between the stop block (431) and the second side plate (12); the second side plate (12) is provided with a mounting groove (121), the stop block (431) is arranged in the mounting groove (121), the spring (432) is positioned in the mounting groove (121), and two ends of the spring are respectively connected with the stop block (431) and the bottom of the mounting groove (121); the side surface of the stop block (431) positioned outside the second side plate (12) is provided with a slope, and the slope faces away from the convex edge (46).

8. An arc chute according to claim 7 wherein: the positioning plate (41) is connected with the first side plate (11) in a sliding mode, a sliding column (44) is arranged at the end portion of the positioning plate (41), a blocking column (45) is arranged at the end portion of the sliding column (44), the sections of the sliding column (44) and the blocking column (45) are circular respectively, and the diameter of the blocking column (45) is larger than that of the sliding column (44); a T-shaped groove (111) is formed in the side face of the first side plate (11), the blocking column (45) is embedded in the bottom of the T-shaped groove (111), and the sliding column (44) penetrates out of the notch of the T-shaped groove (111); one end of the T-shaped groove (111) far away from the convex edge (46) is bent towards the direction of the second side plate (12).