CN219321270U - Heat dissipation type explosion-proof circuit breaker - Google Patents

Abstract

The application relates to the field of circuit breakers, and particularly discloses a heat dissipation type explosion-proof circuit breaker which comprises a box body, a circuit breaker body arranged in the box body, a cover plate arranged on the box body and used for sealing an opening of the box body, a limiting substrate, a positioning rod and a heat conduction silica gel block, wherein the positioning rod is arranged on the limiting substrate, a positioning groove is formed in the heat conduction silica gel block, and the positioning rod is in plug connection with the groove wall of the positioning groove; the box body is characterized in that an installation groove is formed in the inner side wall of the box body, the installation groove penetrates through the end wall of the opening of the box body, the limiting base plate is detachably connected to the side wall of the opening of the box body through a fixing assembly, the locating rod is located on the end wall of the limiting base plate, which faces the center of the box body, and the heat-conducting silica gel block is located among the groove wall of the installation groove, the locating rod and the limiting base plate. This application can conveniently change heat conduction silica gel.

Description

Heat dissipation type explosion-proof circuit breaker

Technical Field

The application relates to the field of circuit breakers, in particular to a heat dissipation type explosion-proof circuit breaker.

Background

A circuit breaker is a switching device that can close, carry and break current under normal or abnormal loop conditions.

Since some circuit breakers are used in environments containing explosive gases and dust, in order to improve the stability of the circuit breaker in use, a circuit breaker includes a circuit breaker body and a sealed housing covering the circuit breaker body, so that the circuit breaker body can be isolated from the environment. In order to reduce the overheat condition of the circuit breaker, the shell of the sealed shell is also filled with heat-conducting silica gel.

However, as the service time increases, the heat-conducting silica gel is also prone to overaging, so that the heat-conducting effect is affected, and the circuit breaker is directly filled with the heat-conducting silica gel in the shell, so that the heat-conducting silica gel is not easy to replace.

Disclosure of Invention

In order to be convenient for change heat conduction silica gel, this application provides a heat dissipation formula explosion-proof circuit breaker.

The application provides a heat dissipation type explosion-proof circuit breaker adopts following technical scheme:

the heat dissipation type explosion-proof circuit breaker comprises a box body, a circuit breaker body arranged in the box body, a cover plate arranged on the box body and used for closing an opening of the box body, a limiting substrate, a positioning rod and a heat conduction silica gel block, wherein the positioning rod is arranged on the limiting substrate, a positioning groove is formed in the heat conduction silica gel block, and the positioning rod is spliced with the groove wall of the positioning groove; the box body is characterized in that an installation groove is formed in the inner side wall of the box body, the installation groove penetrates through the end wall of the opening of the box body, the limiting base plate is detachably connected to the side wall of the opening of the box body through a fixing assembly, the locating rod is located on the end wall of the limiting base plate, which faces the center of the box body, and the heat-conducting silica gel block is located among the groove wall of the installation groove, the locating rod and the limiting base plate.

By adopting the technical scheme, under the limiting action of the locating rod, the groove wall of the mounting groove and the limiting substrate, the heat-conducting silica gel block is stably mounted on the side wall of the box body. The positioning rod and the groove wall of the positioning groove are inserted, so that the heat-conducting silica gel block can be detachably connected to the positioning rod; simultaneously, spacing base plate passes through fixed subassembly and can dismantle the connection on the box body, can realize the connection that can dismantle of heat conduction silica gel piece on the box body lateral wall, is convenient for change heat conduction silica gel.

Optionally, the constant head tank runs through the relative lateral wall of heat conduction silica gel piece, the locating lever passes the constant head tank and with the laminating of constant head tank cell wall, fixed subassembly includes fixed block and fixed spring, be provided with the fixed slot on the box body inner wall, the locating lever is kept away from spacing base plate's one end inserts in the fixed slot, be provided with fixed spout on the cell wall of fixed slot, the fixed block slides and sets up on the fixed spout cell wall, fixed spring sets up the fixed block with between the fixed spout cell wall, the locating lever with be provided with the fixed draw-in groove on the relative lateral wall of fixed spout, fixed block one end stretches out fixed spout and be the arc end wall, the fixed block stretches out fixed spout's one end inserts fixed draw-in groove and with fixed draw-in groove cell wall butt.

By adopting the technical scheme, in the process of inserting the locating rod into the fixed groove, the side wall of the locating rod extrudes the fixed block into the fixed groove, the locating rod slides against the fixed rod, and the fixed spring is compressed in the process. When fixed spout and fixed draw-in groove are relative, the lateral wall of locating lever no longer produces spacing effect to the fixed block, and fixed spring can promote the fixed block and insert in the fixed draw-in groove this moment to can subtract the locating lever location in the fixed slot, realize the detachable connection of locating lever and box body, thereby realize the detachable connection of spacing base plate and box body.

Optionally, one end of the positioning rod, which is far away from the limiting substrate, is set as a buffer arc block, and the narrow end of the buffer arc block is far away from the limiting substrate.

Through adopting above-mentioned technical scheme, reduce the wearing and tearing of locating lever to heat conduction silica gel piece, the arc lateral wall of buffering arc piece and the arc lateral wall butt joint of fixed block simultaneously are convenient for with the fixed block extrusion enter into in the fixed spout.

Optionally, the last stripper plate that is connected with of spacing base plate through receive and release subassembly, the stripper plate stretches into in the mounting groove, the heat conduction silica gel piece compresses tightly the stripper plate with between the locating lever.

By adopting the technical scheme, the heat-conducting silica gel block has certain elasticity, and the friction force between the heat-conducting silica gel block and the wall of the installation groove is relatively large, so that the heat-conducting silica gel block is directly inserted and dissolved in the clamping. The heat-conducting silica gel block is isolated from the wall of the installation groove by the extrusion plate, so that the installation smoothness of the heat-conducting silica gel block is improved; finally, the extrusion plate is detached by the retraction assembly, the heat-conducting silica gel block is deformed in a recovery mode, and the heat-conducting silica gel block can be attached to the wall of the installation groove to achieve a heat dissipation effect.

Optionally, receive and release the subassembly and include receive and release the board, receive and release the board and slide and set up on the spacing base plate deviates from on the lateral wall of one side of locating lever, receive and release board one side lateral wall with the mounting groove is relative, receive and release the board with run through on the relative lateral wall of mounting groove and be provided with spacing logical groove, the stripper plate passes spacing logical groove and with spacing logical groove wall laminating, receive and release the board with be provided with the locating part between the box body.

By adopting the technical scheme, the extrusion plate and the limiting through groove are inserted, so that the detachable connection of the extrusion plate and the retractable plate can be conveniently realized. And after the extrusion plate is pulled away from the retraction plate, the retraction plate and the box body are fixed together by utilizing the limiting piece, so that the random movement of the retraction plate is reduced, and the fixing stability between the limiting base plate and the box body is improved.

Optionally, the locating part includes stopper and spacing spring, be provided with on the lateral wall of box body opening part with the communicating overlap joint groove of mounting groove, receive and release the board orientation the lateral wall of locating lever with the overlap joint groove cell wall flushes, the overlap joint groove with receive and release and be provided with spacing spout on the board flush cell wall, the stopper slides and sets up on the spacing spout cell wall, spacing spring sets up spacing spout cell wall with between the stopper, the stopper end wall stretches out spacing spout just is the arc end wall, receive and release the board orientation be provided with on the lateral wall of locating lever be used for with the spacing draw-in groove of stopper arc end wall grafting.

By adopting the technical scheme, when the retractable plate is moved, the limiting block is extruded into the limiting chute firstly, and meanwhile, the limiting spring is compressed; when the limiting sliding groove is opposite to the limiting clamping groove, the limiting spring pushes the limiting block into the limiting clamping groove, and the retractable plate can be positioned on the box body.

Optionally, run through on the stripper plate and be provided with a plurality of drag reduction logical grooves, be provided with the connecting piece that is used for installing the stripper plate on the box body.

By adopting the technical scheme, the loss of the extrusion plate is reduced by the connecting piece; the friction force between the extrusion plate and the groove wall of the mounting groove is reduced by the drag reduction through groove, and the heat dissipation of the box body is facilitated when the extrusion plate is fixed on the box body.

Optionally, the connecting piece includes connecting block and dog, the connecting block sets up on the box body lateral wall, the dog sets up the connecting block is kept away from the one end of box body, dog, connecting block with form between the box body lateral wall and supply the spacing chamber of stripper plate grafting.

Through adopting above-mentioned technical scheme, put into the stripper plate between dog and the box body lateral wall, utilize the frictional force that the stripper plate received, can fix the stripper plate conveniently.

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

1. this application utilizes spacing effect of locating lever, spacing base plate and mounting groove cell wall, realizes the installation to the heat conduction silica gel piece, simultaneously, and the connection can be dismantled to heat conduction silica gel piece and locating lever, and spacing base plate and box body can be dismantled and be connected, can realize the connection of dismantling of heat conduction silica gel piece and box body, is convenient for change ageing heat conduction silica gel piece.

2. The application has set up the stripper plate, when the installation heat conduction silica gel piece, compresses tightly the heat conduction silica gel piece behind stripper plate and locating lever, can more smoothly insert the installation groove with the heat conduction silica gel piece, dismantle the stripper plate at last, the heat conduction silica gel piece can be released in the installation groove.

Drawings

Fig. 1 is a schematic structural diagram of a heat dissipation type explosion-proof circuit breaker according to an embodiment of the present application.

Fig. 2 is a cross-sectional view taken along line A-A in fig. 1.

Fig. 3 is an exploded view of a detent lever structure used to embody an embodiment of the present application.

Fig. 4 is an enlarged view at B in fig. 2.

Fig. 5 is an enlarged view at C in fig. 2.

Fig. 6 is a schematic diagram of a connector structure according to an embodiment of the present application.

Reference numerals illustrate: 1. a case body; 11. a circuit breaker body; 12. a cover plate; 13. a clamping block; 14. a connecting plate; 15. a clamping groove; 16. a mounting groove; 17. a wire outlet slot; 2. a limit substrate; 21. a positioning rod; 22. a thermally conductive silicone block; 23. a mounting cavity; 24. a positioning groove; 25. buffering the arc block; 3. a fixing assembly; 31. a fixed block; 32. a fixed spring; 33. a fixing groove; 34. a fixed chute; 35. a fixing slot; 4. an extrusion plate; 5. a retraction assembly; 51. a retractable plate; 52. limiting through grooves; 53. a limiting piece; 54. a limiting block; 55. a limit spring; 56. a lap joint groove; 57. limiting sliding grooves; 58. a limit clamping groove; 6. a connecting piece; 61. a connecting block; 62. a stop block; 63. a spacing cavity; 64. an elastic pad; 65. drag reduction through grooves.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a heat dissipation type explosion-proof circuit breaker.

As shown in fig. 1 and 2, a heat dissipation type explosion-proof circuit breaker comprises a rectangular box body 1, wherein a circuit breaker body 11 is arranged in the box body 1, and a wire outlet groove 17 is arranged on the box body 1. The opening of the box body 1 is also provided with a cover plate 12, a clamping block 13 is fixedly connected to the peripheral wall of the box body 1 close to the opening, a connecting plate 14 is integrally connected to the end wall of the cover plate 12, a clamping groove 15 is formed in the side wall of the connecting plate 14, which faces the box body 1, and the clamping block 13 is elastically clamped with the groove wall of the clamping groove 15. The cover plate 12 is attached to the end wall of the opening of the box body 1 and seals the opening of the box body 1.

As shown in fig. 2 and 3, rectangular mounting grooves 16 are formed in opposite inner side walls of the box body 1, and the mounting grooves 16 penetrate through side walls of the opening of the box body 1; the circuit breaker in the embodiment further comprises two limiting substrates 2, a positioning rod 21 and a heat-conducting silica gel block 22, wherein the limiting substrates 2 are rectangular plates, the limiting substrates 2 and the mounting grooves 16 are arranged in one-to-one correspondence, the limiting substrates 2 are detachably connected to the walls of the mounting grooves 16 through the fixing assemblies 3, the limiting substrates 2 are positioned at positions, close to the opening of the box body 1, of the mounting grooves 16, and the limiting substrates 2 are attached to the walls of the mounting grooves 16; the locating rods 21 are fixedly connected to the end walls, far away from the groove walls of the mounting grooves 16, of the limiting base plates 2, a plurality of locating rods 21 are connected to each limiting base plate 2 and perpendicular to the locating rods 21, and mounting cavities 23 are formed among the limiting base plates 2, the locating rods 21 and the groove walls of the mounting grooves 16.

The heat-conducting silica gel blocks 22 and the mounting grooves 16 are arranged in one-to-one correspondence, positioning grooves 24 are formed in the heat-conducting silica gel blocks 22 in a penetrating mode, the positioning grooves 24 and the positioning rods 21 are arranged in one-to-one correspondence, and the positioning rods 21 penetrate through the positioning grooves 24 and are attached to the groove walls of the positioning grooves 24; the heat-conducting silica gel block 22 is positioned in a mounting cavity 23 formed by the wall of the mounting groove 16, the positioning rod 21 and the limiting substrate 2.

When the circuit breaker works normally, the heat-conducting silica gel block 22 is attached to the wall of the mounting groove 16, so that the heat dissipation effect is achieved; after the heat-conducting silica gel block 22 is aged, the connecting plate 14 is broken off, so that the connecting plate 14 is separated from the clamping block 13, the cover plate 12 is taken down, then the fixing assembly 3 is operated, and the limiting base plate 2 and the positioning rod 21 are taken down; and then the aged heat-conducting silica gel block 22 is pulled out from the positioning rod 21, the positioning rod 21 and the positioning groove 24 of the new heat-conducting silica gel block 22 are inserted, the heat-conducting silica gel block 22 is fixed on the positioning rod 21, the limiting substrate 2 is fixed on the wall of the mounting groove 16 by using the fixing component 3, the heat-conducting silica gel block 22 is attached to the wall of the mounting groove 16, and finally the cover plate 12 is covered.

As shown in fig. 3 and 4, the fixing assembly 3 includes a fixing block 31 and a fixing spring 32, the slot wall of the mounting slot 16 facing the cover plate 12 is provided with a fixing slot 33, the fixing slot 33 and the positioning rod 21 are arranged in one-to-one correspondence, one end of the positioning rod 21 away from the limiting substrate 2 is fixedly connected with a buffering arc block 25, and the narrow end of the buffering arc block 25 is away from the positioning rod 21. The end of the positioning rod 21 far away from the limiting substrate 2 and the buffer arc block 25 are inserted into the fixed groove 33, the fixed groove 33 and the opposite side wall of the peripheral wall of the positioning rod 21 are provided with fixed sliding grooves 34, and the fixed block 31 is arranged on the wall of the fixed sliding grooves 34 in a sliding manner along the direction perpendicular to the positioning rod 21; the fixed spring 32 is fixedly connected between one end of the fixed block 31 extending into the fixed groove 33 and the wall of the fixed chute 34. The opposite side walls of the positioning rod 21 and the fixed chute 34 are provided with fixed clamping grooves 35, one end of the fixed block 31, which is far away from the fixed spring 32, extends out of the fixed chute 34 and is an arc-shaped end wall, and one end of the fixed block 31, which extends out of the fixed chute 34, is inserted into the fixed clamping grooves 35 and is abutted against the groove walls of the fixed clamping grooves 35.

In the process of inserting the positioning rod 21 into the fixing groove 33, the buffer arc block 25 firstly presses the arc-shaped side wall of the fixing block 31, so that the fixing block 31 enters the fixing chute 34 and compresses the fixing spring 32, when the fixing chute 34 is opposite to the fixing clamping groove 35, the fixing spring 32 pushes the fixing block 31 out of the fixing chute 34, and the fixing block 31 is inserted into the fixing clamping groove 35, so that the positioning rod 21 is fixed, and the limiting substrate 2 is fixed. When the positioning rod 21 needs to be detached, the positioning rod 21 is pulled forcefully, so that the groove wall of the fixing clamping groove 35 and the arc-shaped side wall of the fixing block 31 relatively move, and the fixing block 31 can be extruded into the fixing chute 34 again, so that the positioning rod 21 is smoothly pulled out of the fixing groove 33, and the positioning rod 21 and the limiting substrate 2 are detached.

As shown in fig. 3, 4 and 5, the thermally conductive silicone block 22 is inserted into the mounting groove 16 for greater convenience. The limiting substrate 2 is detachably connected with an extrusion plate 4, and in this embodiment, a plurality of drag reduction through grooves 65 are formed in the extrusion plate 4 in a penetrating manner. And a retraction assembly 5 matched with the extrusion plate 4 to work is also arranged on the limiting base plate 2. The retraction assembly 5 in this embodiment includes a retraction plate 51, the retraction plate 51 is slidably disposed on a side wall of the limit substrate 2 away from the positioning rod 21 along the width direction of the limit substrate 2, the retraction plate 51 extends out of the limit substrate 2 along one side of the limit substrate 2 away from the positioning rod 21 along the width direction and is opposite to the mounting groove 16, and a limit through groove 52 is disposed on a side wall of the retraction plate 51 opposite to the mounting groove 16 in a penetrating manner; and a limiting member 53 is provided between the retractable plate 51 and the case 1. When the extrusion plate 4 works, the extrusion plate 4 passes through the limiting through groove 52 and is attached to the wall of the limiting through groove 52, and the heat-conducting silica gel block 22 is pressed between the extrusion plate 4 and the positioning rod 21. Thereby, in the process of putting the heat-conducting silica gel block 22 into the mounting groove 16, the extruding plate 4 is contacted with the wall of the mounting groove 16, and the smoothness of the insertion of the heat-conducting silica gel block 22 is improved. After the positioning rod 21 is fixed on the wall of the installation groove 16, the extrusion plate 4 is pulled out, and at this time, the heat-conducting silica gel block 22 is restored to the original state and is attached to the wall of the installation groove 16. Then, the limiting piece 53 is operated to fix the accommodating plate 51 and the box body 1 relatively.

As shown in fig. 5, the limiting member 53 in this embodiment includes a limiting block 54 and a limiting spring 55, a lap joint groove 56 which is communicated with the mounting groove 16 is provided on a side wall at an opening of the box body 1, when the positioning rod 21 is fixed on the mounting groove 16, the retractable plate 51 is attached to a side wall of the positioning rod 21 and a groove wall edge of the lap joint groove 56, a limiting chute 57 is provided on a groove wall to which the lap joint groove 56 is attached to the retractable plate 51, the limiting block 54 is slidably arranged on the groove wall of the limiting chute 57, the limiting spring 55 is fixedly connected between the groove wall of the limiting chute 57 and an end wall of the limiting block 54 extending into the limiting chute 57, and an end wall of the limiting block 54 far from the limiting spring 55 extends out of the limiting chute 57 and is an arc-shaped end wall. The retractable plate 51 is provided with a limiting clamping groove 58 in a penetrating way on the side wall of the limiting through groove 52 away from the limiting base plate 2. After the extrusion plate 4 is pulled away, the retractable plate 51 slides towards the direction of the limiting block 54, the limiting block 54 is extruded into the limiting clamping groove 58 by the side wall of the retractable plate 51, the limiting spring 55 is compressed until the limiting clamping groove 58 is opposite to the limiting sliding groove 57, and the limiting block 54 is pushed into the limiting clamping groove 58 by the limiting spring 55, so that the retractable plate 51 can be fixed. When the positioning rod 21 and the limiting base plate 2 are detached, the retraction plate 51 is forcibly poked, and the limiting block 54 and the limiting clamping groove 58 slide out.

As shown in fig. 5 and 6, in order to store the used squeeze plate 4 for the next use, a connector 6 is provided on the case 1 in this embodiment. The connecting piece 6 comprises a connecting block 61 and a stop block 62, wherein the connecting block 61 is fixedly connected to the outer side wall of the box body 1, the stop block 62 is fixedly connected to one end, far away from the box body 1, of the connecting block 61, and the stop block 62 is perpendicular to the connecting block 61 and parallel to the outer side wall of the box body 1. The side wall of the stop block 62 facing the box body 1 is fixedly connected with an elastic pad 64, and a limiting cavity 63 for inserting the extrusion plate 4 is formed among the elastic pad 64, the connecting block 61 and the outer side wall of the box body 1 on the stop block 62. After the extrusion plate 4 is pulled out of the limit through groove 52, the extrusion plate 4 is inserted into the stop block 62 and the side wall bracket of the box body 1, so that the extrusion plate 4 is relatively fixed in the limit cavity 63.

The implementation principle of the heat dissipation type explosion-proof circuit breaker provided by the embodiment of the application is as follows: when the heat-conducting silica gel block 22 is installed, the heat-conducting silica gel block 22 is taken, and the positioning rod 21 passes through the corresponding positioning groove 24, so that the heat-conducting silica gel block 22 is fixed on the positioning rod 21; the extrusion plate 4 is inserted into the limit through groove 52, then the extrusion plate 4 is pressed with force, so that the extrusion plate 4 extrudes the heat-conducting silica gel block 22, then the positioning rod 21 is inserted into the fixing groove 33, so that the fixing block 31 is inserted into the fixing clamping groove 35, in the process, the extrusion plate 4 is attached to the wall of the mounting groove 16 and is brought into the mounting groove 16, and the accommodating plate 51 is abutted against the edge of the wall of the lap joint groove 56. After the positioning rod 21 is fixed, the extruding plate 4 is extracted and inserted between the stop block 62 and the side wall of the box body 1, and then the retractable plate 51 is shifted, so that the limiting block 54 and the limiting clamping groove 58 are spliced.

When the heat-conducting silica gel block 22 needs to be replaced, the retraction plate 51 is pulled forcefully, the limiting block 54 and the limiting clamping groove 58 are separated, then the positioning rod 21 is pulled to separate the fixed block 31 from the fixed clamping groove 35, the limiting substrate 2 and the positioning rod 21 are taken out from the mounting groove 16, and the heat-conducting silica gel block 22 of the positioning rod 21 is pulled out.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (8)

1. The utility model provides a heat dissipation type explosion-proof circuit breaker, includes box body (1), installs circuit breaker body (11) in box body (1) and sets up on box body (1) and be used for sealing box body (1) open-ended apron (12), its characterized in that: the circuit breaker further comprises a limiting substrate (2), a positioning rod (21) and a heat-conducting silica gel block (22), wherein the positioning rod (21) is arranged on the limiting substrate (2), a positioning groove (24) is formed in the heat-conducting silica gel block (22), and the positioning rod (21) and the groove wall of the positioning groove (24) are connected in an inserting mode; the novel heat-conducting silicon rubber box is characterized in that a mounting groove (16) is formed in the inner side wall of the box body (1), the mounting groove (16) penetrates through the end wall of the opening of the box body (1), the limiting base plate (2) is detachably connected to the side wall of the opening of the box body (1) through a fixing assembly (3), the locating rod (21) is located on the end wall of the center of the box body (1), and the heat-conducting silicon rubber block (22) is located between the groove wall of the mounting groove (16), the locating rod (21) and the limiting base plate (2).

2. The heat dissipation type explosion-proof circuit breaker according to claim 1, wherein: the utility model provides a thermal-conductive silicon rubber block, including fixed block (31) and fixed slot (34) cell wall, fixed subassembly (3) are including fixed block (31) and fixed spring (32), be provided with fixed slot (33) on box body (1) inside wall, fixed block (21) keep away from the one end of spacing base plate (2) inserts in fixed slot (33), be provided with fixed spout (34) on the cell wall of fixed slot (33), fixed block (31) slide and set up on fixed spout (34) cell wall, fixed spring (32) set up fixed block (31) with be provided with fixed draw-in groove (35) on the opposite lateral wall of fixed spout (34), fixed block (31) one end stretches out fixed spout (34) and be the arc end wall, fixed block (31) stretch out fixed spout (34) and insert fixed spout (35) one end butt fixed slot (35).

3. The heat dissipation type explosion-proof circuit breaker according to claim 2, wherein: one end of the locating rod (21) far away from the limiting substrate (2) is provided with a buffer arc block (25), and the narrow end of the buffer arc block (25) is far away from the limiting substrate (2).

4. The heat dissipation type explosion-proof circuit breaker according to claim 1, wherein: the limiting substrate (2) is detachably connected with the extrusion plate (4) through the retraction assembly (5), the extrusion plate (4) stretches into the mounting groove (16), and the heat-conducting silica gel block (22) is tightly pressed between the extrusion plate (4) and the positioning rod (21).

5. The heat dissipation type explosion-proof circuit breaker according to claim 4, wherein: the retractable assembly (5) comprises a retractable plate (51), the retractable plate (51) is arranged on one side wall of the limiting base plate (2) deviating from the positioning rod (21), one side wall of the retractable plate (51) is opposite to the mounting groove (16), a limiting through groove (52) is formed in the opposite side wall of the retractable plate (51) and the mounting groove (16) in a penetrating mode, the extruding plate (4) penetrates through the limiting through groove (52) and is attached to the wall of the limiting through groove (52), and a limiting piece (53) is arranged between the retractable plate (51) and the box body (1).

6. The heat dissipation type explosion-proof circuit breaker according to claim 5, wherein: the limiting piece (53) comprises a limiting block (54) and a limiting spring (55), a lap joint groove (56) communicated with the mounting groove (16) is formed in the side wall of the opening of the box body (1), the folding and unfolding plate (51) faces the side wall of the positioning rod (21) and the groove wall of the lap joint groove (56) are flush, a limiting sliding groove (57) is formed in the groove wall of the lap joint groove (56) and the groove wall of the folding and unfolding plate (51), the limiting block (54) is slidably arranged on the groove wall of the limiting sliding groove (57), the limiting spring (55) is arranged between the groove wall of the limiting sliding groove (57) and the limiting block (54), the end wall of the limiting block (54) extends out of the limiting sliding groove (57) and is an arc-shaped end wall, and a limiting clamping groove (58) for being used for being spliced with the arc-shaped end wall of the limiting block (54) is formed in the side wall of the positioning rod (21).

7. The heat dissipation type explosion-proof circuit breaker according to claim 5, wherein: a plurality of anti-drag through grooves (65) are formed in the extrusion plate (4) in a penetrating mode, and connecting pieces (6) used for installing the extrusion plate (4) are arranged on the box body (1).

8. The heat dissipation type explosion-proof circuit breaker according to claim 7, wherein: the connecting piece (6) comprises a connecting block (61) and a limiting block (54), wherein the connecting block (61) is arranged on the outer side wall of the box body (1), the limiting block (54) is arranged at one end, far away from the box body (1), of the connecting block (61), and a limiting cavity (63) for the insertion of the extrusion plate (4) is formed among the limiting block (54), the connecting block (61) and the outer side wall of the box body (1).

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