CN216671541U

CN216671541U - Backflow gas discharging structure of miniature circuit breaker

Info

Publication number: CN216671541U
Application number: CN202122386189.0U
Authority: CN
Inventors: ***; 薛志炜; 彭琼; 龚祚勇
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-06-03
Anticipated expiration: 2031-09-29

Abstract

The utility model discloses a backflow gas discharging structure of a miniature circuit breaker, which comprises a circuit breaker shell (1), a contact system (2) and an arc extinguish chamber (3), wherein electric arcs generated when the contact system (2) is disconnected enter the arc extinguish chamber (3) from an inlet (301) of the arc extinguish chamber (3), go out of the circuit breaker shell (1) from an outlet of the arc extinguish chamber (3) through exhaust holes after going out of the arc extinguish chamber (3), and the backflow gas discharging structure is characterized in that: the contact system (2) and the area (a) between the entrance (301) of the arc extinguishing chamber (3) are provided with a return gas exhaust structure capable of leading the gas returning from the arc extinguishing chamber (3) out of the circuit breaker housing (1). This backflow gas exhaust structure leads the direct discharge circuit breaker casing of backflow gas, reduces the gas that carries high temperature and charged particle and returns between the contact, has reduced the probability that takes place to puncture between the contact.

Description

Backflow gas discharging structure of miniature circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage electric appliances, and particularly relates to a backflow gas exhaust structure of a miniature circuit breaker, which can reduce the probability of back breakdown at the position of a contact.

Background

The circuit breaker is an important part in a distribution electrical appliance, is mainly used for an industrial low-voltage power system, and is used for connecting and disconnecting current in a power grid circuit and protecting lines and power supply equipment from damage caused by faults of overload, undervoltage, short circuit, single-phase grounding and the like. The function of the circuit breaker to break overload or short-circuit current is mainly accomplished by an arc extinguishing chamber installed in the circuit breaker. When fault current occurs in the circuit and the current value exceeds the set protection range of the intelligent controller, the operating mechanism is driven to act, so that the movable contact and the fixed contact of the circuit breaker are quickly disconnected, and at the moment, the air medium is caused to discharge by the voltage between the movable contact and the fixed contact to generate high-temperature electric arc. The arc causes a sharp rise in the air temperature inside the arc extinguishing device during the combustion process, thereby accelerating the ionization of the air. On the other hand, the electric arc is divided into a plurality of short arcs by a plurality of arc isolating grid pieces under the pushing of the magnetic field and the fluid effect in the arc extinguishing chamber, the deionization effect of the electric arc is enhanced by the metal arc isolating pieces, the electric arc is reduced, the voltage is rapidly increased, and the electric arc is extinguished.

In the prior art, the miniature circuit breaker is provided with the exhaust hole at the bottom side of the arc extinguish chamber, and the electric arc generated by the breaking of the contact system is exhausted out of the shell of the circuit breaker through the exhaust hole, specifically, when the contact of the circuit breaker starts breaking action, electric arc can be formed between the contacts, and the electric arc enters the arc extinguish chamber along the arc striking plate under the action of arc blowing force, so as to extinguish the arc. However, in the existing structure, after the arc is blown into the arc extinguish chamber, a part of the gas flow returns along the original path, and the backflow gas returns to the space between the contacts along the only gas path and carries high-temperature and charged particles, so that the probability of breakdown between the contacts is increased, and the breaking performance of the circuit breaker is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defect that the breakdown probability between contacts is increased by backflow gas generated during breaking of the existing circuit breaker, and provides a backflow gas exhaust structure of a miniature circuit breaker, which is used for guiding the backflow gas to be directly exhausted out of a shell of the circuit breaker, reducing the gas carrying high-temperature and charged particles to return between the contacts and reducing the probability of the backflow gas for breaking the contacts.

Technical scheme

In order to achieve the technical purpose, the utility model provides a backflow gas discharging structure of a miniature circuit breaker, which comprises a circuit breaker shell, a contact system and an arc extinguish chamber, wherein electric arcs generated when the contact system is disconnected enter the arc extinguish chamber from an inlet of the arc extinguish chamber, and are discharged out of the circuit breaker shell from an outlet of the arc extinguish chamber through an exhaust hole after the arc extinguish chamber, and the backflow gas discharging structure is characterized in that: the area between the contact system and the inlet of the arc extinguishing chamber is provided with a backflow gas discharging structure which can guide and discharge high-temperature gas reflowing from the arc extinguishing chamber out of the breaker shell.

Further, backflow gas exhaust structure includes backward flow hole one on the quiet run-on board, on the circuit breaker casing with a backward flow hole one corresponding position sets up backward flow hole two, and backflow gas can pass through backward flow hole one and backward flow hole two are discharged the circuit breaker casing.

Furthermore, a communication pipeline is arranged between the first backflow hole and the second backflow hole to prevent backflow gas from flowing randomly.

Further, the static arc striking plate is fixedly installed in the circuit breaker housing at the front side of the inlet 301 of the arc extinguishing chamber.

Furthermore, the first backflow hole and the second backflow hole are circular holes.

Furthermore, the first backflow hole is formed in the static arc striking plate and located below the contact system and at the position of an inlet of the arc extinguishing chamber.

Advantageous effects

According to the backflow gas exhaust structure of the miniature circuit breaker, backflow gas is guided to be directly exhausted out of the shell of the circuit breaker, gas carrying high-temperature and charged particles is reduced to return to the position between the contacts, and the probability of breakdown between the contacts is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "inner", "outer", "front", "rear", "left", "right", "general side", "spare side", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Example 1

In the prior art, the miniature circuit breaker is provided with the exhaust hole at the bottom side of the arc extinguish chamber, and the electric arc generated by the breaking of the contact system is exhausted out of the shell of the circuit breaker through the exhaust hole, specifically, when the contact of the circuit breaker starts breaking action, electric arc can be formed between the contacts, and the electric arc enters the arc extinguish chamber along the arc striking plate under the action of arc blowing force, so as to extinguish the arc. However, in the existing structure, after the arc is blown into the arc extinguish chamber, a part of the gas flow returns along the original path, and the backflow gas returns to the space between the contacts along the only gas path and carries high-temperature and charged particles, so that the probability of breakdown between the contacts is increased, and the breaking performance of the circuit breaker is reduced. In order to solve the technical problem, as shown in fig. 1, the present embodiment provides a backflow gas discharging structure for a miniature circuit breaker, which includes a circuit breaker housing 1, a contact system 2 and an arc extinguishing chamber 3, an arc generated when the contact system 2 is disconnected enters the arc extinguishing chamber 3 from an inlet 301 of the arc extinguishing chamber 3 and is discharged out of the circuit breaker housing 1 from an outlet of the arc extinguishing chamber 3 through an exhaust hole after the arc extinguishing of the arc extinguishing chamber 3, and a static arc striking plate 4 is fixedly mounted in the circuit breaker housing 1 and is located at a front side of the inlet 301 of the arc extinguishing chamber 3. Wherein the area a between the contact system 2 and the inlet 301 of the arc chute 3 is provided with a return gas exhaust structure capable of guiding the high temperature gas returning from the arc chute 3 out of the circuit breaker housing 1.

Specifically, the backflow gas discharge structure in this embodiment includes the first backflow hole 401 on the static arc-striking plate 4, the second backflow hole 101 is disposed at a position on the circuit breaker housing 1 corresponding to the first backflow hole 401, and the backflow gas can be discharged from the circuit breaker housing 1 through the first backflow hole 401 and the second backflow hole 101. More preferably, a communication pipeline is arranged between the first return hole 401 and the second return hole 101 to prevent return gas from mixing. The first return hole 401 and the second return hole 101 are preferably circular holes, and actually, the shapes of the first return hole 401 and the second return hole 101 are various as long as they are through holes. Also, for best effect of guiding the return gas, the return hole one 401 is arranged on the static arc ignition plate 4 at a position below the contact system 2 and opposite to the inlet 301 of the arc extinguishing chamber 3.

According to the backflow gas exhaust structure of the miniature circuit breaker, provided by the embodiment of the utility model, backflow gas is guided to be directly exhausted out of the shell of the circuit breaker, so that the gas carrying high temperature and charged particles is reduced to return to the position between the contacts, and the probability of breakdown between the contacts is reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a miniature circuit breaker backflow gas exhaust structure, it includes circuit breaker casing (1), contact system (2) and explosion chamber (3), the electric arc that produces when contact system (2) divide absolutely can be followed entry (301) of explosion chamber (3) get into in explosion chamber (3) and process export from explosion chamber (3) behind explosion chamber (3) the arc extinguishing is through exhaust hole discharge circuit breaker casing (1), its characterized in that: the contact system (2) and the area (a) between the inlets (301) of the arc-extinguishing chamber (3) are provided with a backflow gas exhaust structure capable of guiding and exhausting high-temperature gas flowing back from the arc-extinguishing chamber (3) out of the circuit breaker housing (1).

2. A return gas discharge structure of a small size circuit breaker according to claim 1, wherein: backflow gas exhaust structure includes return-flow hole one (401) on quiet run-on board (4), on circuit breaker casing (1) with return-flow hole one (401) correspond the position and set up return-flow hole two (101), and backflow gas can pass through return-flow hole one (401) and return-flow hole two (101) are discharged circuit breaker casing (1).

3. A return gas discharge structure of a small size circuit breaker according to claim 2, wherein: and a communication pipeline is arranged between the first backflow hole (401) and the second backflow hole (101) to prevent backflow gas from mixing.

4. A return gas discharge structure of a miniature circuit breaker according to claim 2, wherein: the static arc striking plate (4) is fixedly arranged in the circuit breaker shell (1) and is positioned at the front side of an inlet (301) of the arc extinguishing chamber (3).

5. A return gas discharge structure of a small size circuit breaker according to claim 2 or 3, wherein: the first backflow hole (401) and the second backflow hole (101) are circular holes.

6. A return gas discharge structure of a miniature circuit breaker according to claim 2, wherein: the first backflow hole (401) is arranged on the static arc striking plate (4) and located below the contact system (2) and opposite to an inlet (301) of the arc extinguishing chamber (3).