CN216624173U

CN216624173U - Circuit breaker

Info

Publication number: CN216624173U
Application number: CN202123087652.8U
Authority: CN
Inventors: 刘洪武; 殷乃睿; 瞿帅强
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-05-27
Anticipated expiration: 2031-12-09

Abstract

A circuit breaker belongs to the technical field of low-voltage electrical appliances. Including casing, explosion chamber, the free subassembly that disappears is equipped with the appearance chamber in the casing, and the explosion chamber is placed at the appearance intracavity with the free subassembly that disappears, and high-temperature gas in the explosion chamber discharges the casing outside through the free subassembly that disappears, and the explosion chamber includes a set of arc extinguishing bars piece of array, characteristics: the deionization assembly is arranged at one end of one group of arc-extinguishing grid pieces of the array, so that the distance between the deionization assembly and each arc-extinguishing grid piece of the group of arc-extinguishing grid pieces of the array is gradually increased from one end to the other end of the array direction. The advantages are that: the high-temperature gas in the breaker can be effectively exhausted from the breaker, the short circuit between the free component and the lead-in terminal conducting bar can not be eliminated, the creepage distance between the moving contact and the lead-in terminal conducting bar can not be influenced, the grid sheet short circuit in the arc extinguishing grid sheet can not be caused, and the compactness of the internal structure of the breaker is ensured.

Description

Circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage electric appliances, and particularly relates to a circuit breaker.

Background

Along with the continuous progress of power supply grid technology, system loop design capacity is higher and higher, the requirement is constantly integrated and miniaturized for the volume of the existing circuit breaker, short-circuit fault current breaking capacity is constantly improved, when the circuit breaker is subjected to short-circuit fault current breaking of more than 50kA, the high-temperature free gas generated during short-circuit breaking can not be completely eliminated by an arc extinguishing system in the original circuit breaker, and the high-temperature free gas is sprayed out of the circuit breaker body, so that the problems of inter-phase breakdown, part burning loss and even accident and the like are easily caused. Therefore, the deionization assembly is usually placed at the far end of the gas outlet of the arc extinguish chamber in the circuit breaker to fully cool the sprayed high-temperature gas, and the deionization assembly is generally formed by alternately stacking one or more layers of metal woven wire meshes or one or more metal perforated plates. As shown in fig. 1, in the conventional molded case circuit breaker, the deionization assembly 3 is generally placed between the arc extinguish chamber 2 and the air outlet along the height direction of the circuit breaker, which is disadvantageous in that the deionization assembly 3 may greatly reduce the creepage distance between the movable contact 4 and the lead-in terminal conducting bar, thereby reducing the voltage resistance of the circuit breaker itself, and meanwhile, because the energy generated by breaking is relatively large, the deionization assembly 3 does not timely eliminate the metal particles discharged along with the high-temperature gas, resulting in short circuit of the arc with the lead-in terminal conducting bar through the deionization assembly 3, or short circuit of the grid of the arc extinguish grid 21 caused by the arc passing through the deionization assembly 3, thereby losing the arc extinguish function and reducing the arc extinguish effect.

In view of the above-mentioned prior art, there is a need for a reasonable improvement in the location of the trip assembly in existing circuit breakers. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a circuit breaker, which can effectively discharge high-temperature gas in the circuit breaker to the outside of the circuit breaker, can not cause short circuit between a deionization component and a lead-in terminal conductive bar, can not influence the creepage distance between a moving contact and the lead-in terminal conductive bar, can not cause short circuit of grid pieces in an arc extinguishing grid piece, and simultaneously ensures the compactness of the internal structure of the circuit breaker by arranging the deionization component in the circuit breaker.

The utility model aims to accomplish the task in such a way that the circuit breaker comprises a shell, an arc extinguish chamber and a deionization assembly, wherein a containing cavity is arranged in the shell, the arc extinguish chamber and the deionization assembly are placed in the containing cavity, high-temperature gas in the arc extinguish chamber is discharged to the outside of the shell through the deionization assembly, the arc extinguish chamber comprises a group of arc extinguish grid pieces in an array, and the circuit breaker is characterized in that: the deionization assembly is arranged at one end of one group of arc-extinguishing grid pieces of the array, so that the distance between the deionization assembly and each arc-extinguishing grid piece of the group of arc-extinguishing grid pieces of the array is gradually increased from one end to the other end in the array direction.

In a specific embodiment of the present invention, the array direction of the set of arc chute pieces extends along the height direction of the circuit breaker.

In another specific embodiment of the utility model, the upper end of the arc extinguishing grid plate array direction is provided with an deionization containing cavity, and the deionization assembly is placed in the deionization containing cavity.

In another specific embodiment of the utility model, the arc extinguishing grid plate array direction lower end is provided with an arc extinguishing accommodating cavity, and the arc extinguishing assembly is placed in the arc extinguishing accommodating cavity.

In a further specific embodiment of the present invention, an air outlet is disposed above the chamber, and the bottom of the air outlet is communicated with the air outlet side of the deionization unit.

In a further specific embodiment of the present invention, an air outlet is disposed below the chamber, and the top of the air outlet is communicated with the air outlet side of the deionization unit.

In a further specific embodiment of the present invention, an air outlet channel is formed between the rear end of the arc chute and the inner wall of the cavity, and an L-shaped air outlet channel is formed between the air outlet channel and the air outlet.

Due to the adoption of the structure, the utility model has the beneficial effects that: the free subassembly that disappears is built-in inside the circuit breaker, has guaranteed the compactedness of circuit breaker inner structure, and the free subassembly setting that disappears simultaneously is in the one end of arc extinguishing bars piece array direction to constitute L shape exhaust passage with the circuit breaker gas outlet, with high-temperature gas discharge circuit breaker outside, can not lead to disappearing free subassembly and the lead-in wire end and lead to the electrical drainage short circuit, can not cause the bars piece short circuit in the arc extinguishing bars piece, can not influence the creepage distance between moving contact and the lead-in wire end electrical drainage simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker according to the prior art.

Fig. 2 is a schematic structural diagram of a deionization unit disposed above an arc extinguishing chamber according to an embodiment of the circuit breaker of the present invention.

Fig. 3 is a schematic structural view of a deionization unit disposed under an arc extinguishing chamber according to another embodiment of the circuit breaker of the present invention.

Fig. 4 is a schematic diagram of an arc chute structure according to another embodiment of the utility model.

Fig. 5 is a schematic diagram of an arc chute structure according to another embodiment of the utility model.

In the figure: 1. the air purifier comprises a shell, a cavity 11, a 111 deionization containing cavity, a 1111 air inlet, a 112 air outlet, a 113 inner wall, a 114 air outlet channel; 2. arc extinguish chamber, 21 arc extinguish grid pieces, 211, slotting, 212 and chamfering; 3. a deionization component; 4. a moving contact; 5. static contact; 6. a rotating shaft.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes in form and not essential to the inventive concept should be regarded as the protection scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the positions shown in the corresponding drawings, and thus, should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 2 and 3, the present invention relates to a circuit breaker, which includes a housing 1, an operating mechanism (not shown), a handle (not shown), a shaft 6, an arc extinguish chamber 2, a trip eliminating assembly 3, a contact system, and a trip system (not shown). The contact system comprises a movable contact 4 and a fixed contact 5. When the breaker is switched on and off, the handle drives the operating mechanism to act, the operating mechanism drives the rotating shaft 6 to act after the operating mechanism acts, and the rotating shaft 6 drives the moving contact 4 to realize contact or separation with the static contact 5, namely, the contact system acts.

As shown in fig. 2 and 3, the deionization component 3 is disposed on one side of the movable contact 4, a cavity 11 is disposed in the housing 1, and the arc extinguish chamber 2 and the deionization component 3 are disposed in the cavity 11. The explosion chamber 2 include a set of arc extinguishing bars piece 21 of array, the direction of array is the direction that the arc extinguishing bars piece 21 arranged the extension, in this embodiment, the array direction of a set of arc extinguishing bars piece 21 is for extending along the direction of height of circuit breaker, the distance of each arc extinguishing bars piece in a set of arc extinguishing bars piece 21 of subassembly 3 and array that disappears increase progressively from the one end of array direction to the other end in proper order. The specific mounting position of the deionization unit 3 is described in detail by the following examples.

Example 1

As shown in fig. 2, in the present embodiment, the upper end of the arc-extinguishing grid 21 in the array direction is provided with an ionization-elimination accommodating cavity 111, the ionization-elimination accommodating cavity 111 is closely attached to the upper end of the arc-extinguishing grid 21 or is spaced from the arc-extinguishing grid 21 by a certain distance, and the ionization-elimination assembly 3 is placed in the ionization-elimination accommodating cavity 111. The chamber 11 top is provided with gas outlet 112, gas outlet 112 with the subassembly 3 that frees gives vent to anger side UNICOM, the free chamber 111 bottom of holding of disappearing seted up air inlet 1111, air inlet 1111 and explosion chamber UNICOM, be formed with air outlet channel 114 between arc extinguishing bars piece 21 rear end and the inner wall 113 that holds the chamber 11, air outlet channel 114 passes through and forms L shape exhaust passage between air inlet 1111 and the gas outlet 112. The deionization unit 3 is generally composed of one or more layers of metal woven wire mesh which are alternatively stacked, and also can be composed of one or more metal perforated plates which are alternatively stacked. The metal woven wire mesh can be of different structures or different porosities, and also can be of the same structure or the same porosity; the porous metal plates can be porous metal plates with different structures or different porosities, and also can be porous metal plates with the same structures or the same porosities. During the specific use, can produce high temperature free gas and spout from explosion chamber 2 when the moving contact 4 and the static contact 5 of circuit breaker divide the short-circuit current, the subassembly 3 that disappears is put in the chamber 111 that holds that disappears along the circuit breaker direction of height, and the distance with each arc extinguishing bars piece in a set of arc extinguishing bars piece 21 of array increases progressively from the one end of array direction to the other end in proper order, and the distance that disappears free subassembly 3 from the first arc extinguishing bars piece of lower extreme is L1 promptly, and the distance with the second arc extinguishing bars piece that is close to first arc extinguishing bars piece next to the lower extreme is L2, analogizes in proper order, and the arc extinguishing bars piece distance from the last piece of array direction is Ln, distance L1< L2< … < Ln. The arc extinguishing accommodating cavity 111 is tightly attached to the upper end of the arc extinguishing grid piece 21 or is spaced from the arc extinguishing grid piece 21 by a certain distance. The high-temperature gas enters the deionization unit 3 through the gas inlet 1111, is fully cooled by the deionization unit 3, and is discharged to the outside of the circuit breaker through the gas outlet 112. The free subassembly 3 that disappears that so add can not lead to disappearing free subassembly 3 and the leading bar short circuit of inlet wire end, and can not influence the creepage distance between circuit breaker moving contact 4 and the leading bar of inlet wire end, thereby can not cause the quantity reduction that several short circuits arouse the arc extinguishing bars piece 21 of participating in the arc extinguishing effect among them of arc extinguishing bars piece 21 and lead to reducing the arc extinguishing effect, has guaranteed the compactness of circuit breaker inner structure simultaneously.

Example 2

As shown in fig. 3, in the present embodiment, the deionization containing cavity 111 is disposed at the lower end of the arc-extinguishing grid 21 in the array direction, the deionization assembly 3 is disposed in the deionization containing cavity 111, the distance from each arc-extinguishing grid in a group of arc-extinguishing grid 21 in the array direction increases from one end to the other end in the array direction, that is, the distance from the deionization assembly 3 to the first arc-extinguishing grid at the upper end is L1, the distance from the second arc-extinguishing grid next to the first arc-extinguishing grid at the upper end is L2, and so on, the distance from the last arc-extinguishing grid in the array direction is Ln, and the distance L1< L2< … < Ln. The free chamber 111 that holds that disappears hug closely at the lower extreme of arc extinguishing bars piece 21 or with arc extinguishing bars piece 21 certain distance apart, the free chamber 111 top that holds that disappears seted up air inlet 1111, air inlet 1111 and explosion chamber UNICOM, it is provided with gas outlet 112 to hold the chamber 11 below, gas outlet 112 top with the free subassembly 3 side UNICOM of giving vent to anger disappears, arc extinguishing bars piece 21 rear end and the inner wall 113 that holds the chamber 11 are formed with air outlet channel 114 within a definite time, air outlet channel 114 passes through and forms L shape exhaust passage between air inlet 1111 and the gas outlet 112. The deionization unit 3 is generally composed of one or more layers of metal woven wire mesh which are alternatively stacked, and also can be composed of one or more metal perforated plates which are alternatively stacked. The metal woven wire mesh can be of different structures or different porosities, and also can be of the same structure or the same porosity; the porous metal plates can be porous metal plates with different structures or different porosities, and also can be porous metal plates with the same structures or the same porosities. The specific use is as described in example 1.

Example 3

As shown in fig. 4, in this embodiment, the arc chute 21 is provided with a slot 211, when the rear end of the arc chute 21 is in contact with the inner wall 113 of the cavity 11, an air outlet channel 114 is formed between the slot 211 and the inner wall 113 of the cavity 11, and the air outlet channel 114 passes through the air inlet 1111 and forms an L-shaped air outlet channel with the air outlet 112. The specific use is as described in example 1.

Example 4

As shown in fig. 5, in the present embodiment, a chamfer 212 (may also be rounded) is provided on the arc chute 21, when the rear end of the arc chute 21 is in abutting contact with the inner wall 113 of the cavity 11, an air outlet channel 114 is formed between the chamfer 212 and the inner wall 113 of the cavity 11, and the air outlet channel 114 passes through the air inlet 1111 and forms an L-shaped air outlet channel with the air outlet 112. The specific use is as described in example 1.

Claims

1. The utility model provides a circuit breaker, includes casing (1), explosion chamber (2), disappears and dissociate subassembly (3), be equipped with in casing (1) and hold chamber (11), explosion chamber (2) are placed in holding chamber (11) with disappearing and dissociate subassembly (3), and the high-temperature gas in explosion chamber (2) discharges to casing (1) outside through disappearing and dissociate subassembly (3), explosion chamber (2) including a set of arc extinguishing bars piece (21) of array, its characterized in that: the deionization component (3) is arranged at one end of a group of arc-extinguishing grid plates (21) of the array, so that the distance between the deionization component (3) and each arc-extinguishing grid plate in the group of arc-extinguishing grid plates (21) of the array is gradually increased from one end to the other end in the array direction.

2. A circuit breaker according to claim 1, wherein: the array direction of the group of arc extinguishing grids (21) extends along the height direction of the circuit breaker.

3. A circuit breaker according to claim 1, wherein: the upper end of the array direction of the arc extinguishing grid plates (21) is provided with an deionization containing cavity (111), and the deionization component (3) is placed in the deionization containing cavity (111).

4. A circuit breaker according to claim 1, wherein: the lower end of the array direction of the arc extinguishing grid plates (21) is provided with an deionization containing cavity (111), and the deionization component (3) is placed in the deionization containing cavity (111).

5. A circuit breaker according to claim 3, wherein: an air outlet (112) is formed above the cavity (11), and the air outlet (112) is communicated with the air outlet side of the deionization component (3).

6. A circuit breaker according to claim 4, wherein: an air outlet (112) is formed in the lower portion of the accommodating cavity (11), and the air outlet (112) is communicated with the air outlet side of the deionization component (3).

7. A circuit breaker according to claim 5 or 6, wherein: an air outlet channel (114) is formed between the rear end of the arc extinguishing grid plate (21) and the inner wall (113) of the cavity (11), and an L-shaped exhaust channel is formed between the air outlet channel (114) and the air outlet (112).