Box body structure of common box type circuit breaker

Abstract

The utility model relates to a box body structure of a common box type circuit breaker, which comprises a lower box body, an upper box body, a wiring terminal, a buckle cover, an explosion-proof fragmentation and an explosion-proof protection plate, the lower box body is connected with the upper box body in a sealing way, a sealing cavity is formed between the lower box body and the upper box body, the upper box body is connected with the wiring terminal in a sealing way through the buckle cover, the wiring terminal extends into the sealing cavity, and the explosion-proof fragmentation is connected with the explosion-proof protection plate through the buckle cover. A pressure relief opening communicated with the sealing cavity is formed in one side of the lower box body, the position, located at the pressure relief opening, of the lower box body is connected with an anti-explosion fragment in a sealed mode, the anti-explosion protection plate is fixedly connected to the outer side of the anti-explosion fragment, and pressure relief mesh holes are formed in the side face of the anti-explosion protection plate. The main purpose of the utility model is to control the air pressure of the sealing cavity through the explosion-proof fragmentation, and the discharged air is blocked and dispersed by the explosion-proof protection plate, thereby preventing the sealing structure among the accessories such as the lower box body, the upper box body, the wiring terminal and the like from being damaged by the overhigh air pressure, and the explosion-proof fragmentation can be replaced for reuse after the circuit fault is eliminated. Therefore, maintenance cost is reduced, and economic benefits are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a box structure of a common box type circuit breaker. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry and disconnect current under normal circuit conditions and can close, carry and disconnect current under abnormal circuit conditions within a specified time. Existing common-box circuit breakers have built-in isolation, built-in mutual inductors, built-in circuit breakers and other modular components, and are filled with insulating gas inside the box to improve the insulation capacity and moisture-proof effect of the circuit breaker. When the box heats up due to excessive current, the air pressure inside the box is too high, there will be certain safety hazards, and it will affect the sealing structure of the box, increasing the difficulty of subsequent maintenance. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a box structure of a common box type circuit breaker, including a lower box, an upper box, wiring terminals, a buckle cover, an explosion-proof partition and an explosion-proof protective plate, the lower box is sealingly connected to the upper box, and a sealed cavity is formed between the lower box and the upper box, the upper box is sealingly connected to the wiring terminals through the buckle cover, and the wiring terminals extend into the sealed cavity, a pressure relief port connected to the sealed cavity is provided on one side of the lower box, the lower box is sealingly connected to the explosion-proof partition at the pressure relief port, the explosion-proof protective plate is fixedly connected to the outer side of the explosion-proof partition, and a pressure relief mesh is provided on the side of the explosion-proof protective plate.

[0004] By adopting the above technical scheme, when the air pressure in the sealed cavity increases to a preset value, the explosion-proof partition ruptures, and the air pressure is discharged from the pressure relief port and blocked by the explosion-proof protective plate, so that the gas is dispersed from all sides of the explosion-proof protective plate, thereby achieving the purpose of explosion-proof. The air pressure in the sealed cavity is controlled by the explosion-proof partition to prevent the sealing structure between the lower box body, the upper box body, the wiring terminals and other accessories from being damaged due to excessive air pressure. After the fault is eliminated, the explosion-proof partition can be replaced and used again, thereby reducing maintenance costs and improving economic benefits.

[0005] The utility model is further configured that a first sealing ring for sealingly connecting to a lower box body is provided on the inner side of the explosion-proof segment, a mounting hole is provided on the outer side of the first sealing ring of the explosion-proof segment, and the explosion-proof segment is threadedly connected to the pressure relief port of the lower box body through the mounting hole.

[0006] Furthermore, an explosion-proof membrane is provided at the center of the explosion-proof segment.

[0007] Furthermore, a double-headed screw is provided between the explosion-proof segment and the explosion-proof protective plate, one end of the double-headed screw is threaded through the explosion-proof segment and is threadedly connected to the lower box body, and the other end is threadedly connected to the explosion-proof protective plate through a nut.

[0008] Furthermore, the explosion-proof shield includes an outer baffle and a semicircular buckle plate, the double-headed screws are distributed in a circle on the outer baffle, the semicircular buckle plate is fixedly connected to the outer baffle by the double-headed screws, and the bottom surface of the semicircular buckle plate is provided with the pressure relief mesh.

[0009] By adopting the above technical solution, the explosion-proof partitions and explosion-proof guard plates are detachably connected to the lower box body through double-headed screws to facilitate subsequent maintenance and replacement. The explosion-proof diaphragm is a stainless steel diaphragm with a stable structure and does not react with the internal gas.

[0010] The utility model is further configured that the upper box body is provided with a second sealing ring for sealingly connecting with the lower box body, and a threaded portion for connecting with the lower box body, and the lower box body is provided with a through hole corresponding to the threaded portion.

[0011] By adopting the above technical solution, the lower box body is generally rectangular in structure, the upper box body is provided with a rectangular sealing groove, the second sealing ring is inserted into the upper box body through the rectangular sealing groove, the outer side of the upper box body is provided with a threaded portion evenly distributed along the outer side surface, the screw is passed through the through hole from bottom to top and threadedly connected to the threaded portion, so that the upper box body and the lower box body are sealed and connected through the second sealing ring, and the overall structure is simple and the design is reasonable.

[0012] The utility model is further configured that the wiring terminal is provided with a step portion, and the bottom surface of the step portion is provided with a third sealing ring for sealingly connecting to the upper box body, the buckle cover is sleeved on the step portion, and the buckle cover is threadedly connected to the upper box body.

[0013] By adopting the above technical scheme, a circular sealing groove is provided at the bottom of the step portion, and the third sealing ring is inserted into the terminal block through the circular sealing groove. The top of the terminal block is used for external cables, and the bottom is used for connecting modular components such as isolation and transformers. When the terminal block abuts against the upper box body, the buckle cover is a hollow rectangular sheet metal part, and the four corners are provided with through holes for installation. The buckle cover passes through the terminal block and is connected to the upper box body by screws, so that the step portion is fixedly connected between the upper box body and the buckle cover. The upper box body is connected to six groups of terminal blocks at the same time, and the interfaces of different terminal blocks are oriented in different directions, so that the buckle cover can be universal to improve installation production.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The air pressure in the sealed chamber is controlled by explosion-proof partitions, and the exhausted gas is blocked and dispersed by the explosion-proof protective plate, so as to avoid damage to the sealing structure between the lower box, upper box, wiring terminals and other accessories due to excessive air pressure. After eliminating the circuit fault, the explosion-proof partition can be replaced and used again, thereby reducing maintenance costs and improving economic benefits.

[0016] The embodiments of the utility model are further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the utility model;

[0018] Figure 2 For the utility model Figure 1 Sectional view of the A direction view;

[0019] Figure 3 For the utility model Figure 1 A partial enlarged view of the B direction view;

[0020] Figure 4 This is a schematic diagram of the structure in which the explosion-proof segments and explosion-proof guard plates are installed on the lower box body in the utility model;

[0021] Figure 5 For the utility model Figure 2 A partial enlarged view of the C-direction view;

[0022] Figure 6 For the utility model Figure 2 A partial enlarged view of the middle D-direction view;

[0023] Among them: 1-lower box, 2-upper box, 3-terminal, 4-buckle cover, 5-explosion-proof partition, 6-explosion-proof guard plate, 7-first sealing ring, 8-double-headed screw, 9-second sealing ring, 10-third sealing ring, 11-sealing chamber, 12-pressure relief port, 21-threaded part, 31-step part, 51-mounting hole, 52-explosion-proof diaphragm, 61-pressure relief mesh, 62-outer baffle, 63-semicircular buckle plate; DETAILED DESCRIPTION

[0024] like Figure 1 , 2 As shown, this embodiment provides a box structure of a common box type circuit breaker, including a lower box 1, an upper box 2, a wiring terminal 3, a buckle cover 4, an explosion-proof partition 5 and an explosion-proof shield 6. The lower box 1 is sealed and connected to the upper box 2, and a sealed cavity 11 is formed between the lower box 1 and the upper box 2. The upper box 2 is sealed and connected to the wiring terminal 3 through the buckle cover 4, and the wiring terminal 3 extends into the sealed cavity 11. A pressure relief port 12 communicating with the sealed cavity 11 is provided on one side of the lower box 1. The lower box 1 is sealed and connected to the explosion-proof partition 5 at the pressure relief port 12. The explosion-proof shield 6 is fixedly connected to the outer side of the explosion-proof partition 5, and a pressure relief mesh 61 is provided on the side of the explosion-proof shield 6.

[0025] In the utility model, when the air pressure in the sealed cavity 11 increases to a preset value, the explosion-proof partition 5 ruptures, the air pressure is discharged from the pressure relief port 12, and is blocked by the explosion-proof protective plate 6, so that the gas is dispersed from the four sides of the explosion-proof protective plate 6, thereby achieving the purpose of explosion-proof. The air pressure in the sealed cavity 11 is controlled by the explosion-proof partition 5 to avoid damage to the sealing structure between the lower box body 1, the upper box body 2, the wiring terminal 3 and other accessories. When the fault is eliminated, the explosion-proof partition 5 can be replaced and used again, thereby reducing maintenance costs and improving economic benefits.

[0026] Combination Figure 3 , 4 As shown, in this embodiment, the inner side of the explosion-proof segment 5 is provided with a first sealing ring 7 for sealingly connecting the lower box body 1, and the explosion-proof segment 5 is provided with a mounting hole 51 on the outer side of the first sealing ring 7. The explosion-proof segment 5 is threadedly connected to the pressure relief port 12 of the lower box body 1 through the mounting hole 51. The center of the explosion-proof segment 5 is provided with an explosion-proof diaphragm 52, and the explosion-proof guard plate 6 includes an outer baffle 62 and a semicircular buckle plate 63. The double-headed screws 8 are circumferentially distributed on the outer baffle 62, and the semicircular buckle plate 63 is fixedly connected to the outer baffle through the double-headed screws 8. 62, a pressure relief mesh 61 is provided on the bottom surface of the semicircular buckle plate 63, and six groups of double-headed screws 8 are distributed circumferentially between the explosion-proof partition 5 and the explosion-proof protective plate 6, one end of the double-headed screw 8 is threaded through the explosion-proof partition 5 and is threadedly connected to the lower box body 1, and the other end is threadedly connected to the explosion-proof protective plate 6 through a nut. The explosion-proof partition 5 and the explosion-proof protective plate 6 are detachably connected to the lower box body 1 through the double-headed screw 8 to facilitate subsequent maintenance and replacement. The explosion-proof diaphragm 52 is a stainless steel diaphragm with a stable structure and does not react with the gas in the sealing chamber 11.

[0027] Combination Figure 5 As shown, in this embodiment, the bottom surface of the upper box body 2 is provided with a second sealing ring 9 for sealingly connecting to the lower box body 1, and a threaded portion 21 for connecting to the lower box body 1, the lower box body 1 is provided with a through hole corresponding to the threaded portion 21, the lower box body 1 is overall rectangular in structure, the upper box body 2 is provided with a rectangular sealing groove, the second sealing ring 9 is inserted into the upper box body 2 through the rectangular sealing groove, the outer side of the upper box body 2 is provided with a threaded portion 21 evenly distributed along the outer side surface, the screw is passed through the through hole from bottom to top and is threadedly connected to the threaded portion 21, so that the upper box body 2 and the lower box body 1 are sealed and connected through the second sealing ring 9, and the overall structure is simple and the design is reasonable.

[0028] Combination Figure 6As shown, in this embodiment, the terminal block 3 is provided with a step portion 31, and the bottom surface of the step portion 31 is provided with a third sealing ring 10 for sealingly connecting the upper box body 2, the buckle cover 4 is sleeved on the step portion 31, and the buckle cover 4 is threadedly connected to the upper box body 2, and the bottom of the step portion 31 is provided with a circular sealing groove, and the third sealing ring 10 is inserted into the terminal block 3 through the circular sealing groove. When the terminal block 3 is abutted against the upper box body 2, the buckle cover 4 is a hollow rectangular sheet metal part, and the buckle cover 4 is provided with four holes for installation. The buckle cover 4 passes through the terminal block 3 and is connected to the upper box body 2 by screws, so that the step portion 31 is fixedly connected between the upper box body 2 and the buckle cover 4. The upper box body 2 is connected to six groups of terminal blocks 3 at the same time, and the interfaces of different terminal blocks 3 are oriented in different directions, so that the buckle cover 4 can be universal, and there is no need to identify the mounting parts, so as to improve the production of installation.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A box structure of a common box type circuit breaker, characterized in that: The invention comprises a lower box (1), an upper box (2), a wiring terminal (3), a buckle cover (4), an explosion-proof split sheet (5) and an explosion-proof protective plate (6); the lower box (1) is sealedly connected to the upper box (2), and a sealed cavity (11) is formed between the lower box (1) and the upper box (2); the upper box (2) is sealedly connected to the wiring terminal (3) through the buckle cover (4), and the wiring terminal (3) extends into the sealed cavity (11); a pressure relief port (12) communicating with the sealed cavity (11) is provided on one side of the lower box (1); the lower box (1) is sealedly connected to the explosion-proof split sheet (5) at the pressure relief port (12); the explosion-proof protective plate (6) is fixedly connected to the outer side of the explosion-proof split sheet (5); and a pressure relief mesh (61) is provided on the side of the explosion-proof protective plate (6).

2. The box structure of a common box type circuit breaker according to claim 1, characterized in that: The explosion-proof segment (5) is provided with a first sealing ring (7) on the inner side thereof for sealingly connecting with the lower box body (1); the explosion-proof segment (5) is provided with a mounting hole (51) on the outer side thereof, and the explosion-proof segment (5) is threadedly connected to the pressure relief port (12) of the lower box body (1) through the mounting hole (51).

3. The box structure of a common box type circuit breaker according to claim 2, characterized in that: An explosion-proof membrane (52) is arranged at the center of the explosion-proof segment (5).

4. The box structure of a common box type circuit breaker according to claim 3, characterized in that: A double-headed screw (8) is provided between the explosion-proof segment (5) and the explosion-proof protective plate (6); one end of the double-headed screw (8) is threaded through the explosion-proof segment (5) and is threadedly connected to the lower box body (1); and the other end is threadedly connected to the explosion-proof protective plate (6) through a nut.

5. The box structure of a common box type circuit breaker according to claim 4, characterized in that: The explosion-proof shield (6) comprises an outer baffle (62) and a semicircular buckle plate (63), the double-headed screw (8) is circumferentially distributed on the outer baffle (62), the semicircular buckle plate (63) is fixedly connected to the outer baffle (62) via the double-headed screw (8), and the opening of the semicircular buckle plate (63) faces upward, and the bottom surface of the semicircular buckle plate (63) is provided with the pressure relief mesh (61).

6. The box structure of a common box type circuit breaker according to claim 1, characterized in that: The upper box body (2) is provided with a second sealing ring (9) for sealingly connecting with the lower box body (1), and a threaded portion (21) for connecting with the lower box body (1), and the lower box body (1) is provided with a through hole corresponding to the threaded portion (21).

7. The box structure of a common box type circuit breaker according to claim 1, characterized in that: The connection terminal (3) is provided with a step portion (31), and the bottom surface of the step portion (31) is provided with a third sealing ring (10) for sealingly connecting with the upper box body (2); the buckle cover (4) is sleeved on the step portion (31), and the buckle cover (4) is threadedly connected to the upper box body (2).

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