CN216288286U - Exhaust piece, arc extinguishing system and circuit breaker - Google Patents

Abstract

The utility model relates to the field of low-voltage electricity, in particular to an exhaust member, which comprises an exhaust member body and an exhaust channel arranged in the exhaust member body, wherein the exhaust channel comprises a first channel vertical section, a channel transition section, a second channel vertical section and a channel transverse section which are sequentially connected, the first channel vertical section and the second channel vertical section are arranged in parallel, the channel transition section is communicated with the first channel vertical section and the second channel vertical section, the free end of the first channel vertical section is an exhaust member air inlet, one end of the channel transverse section is communicated with the second channel vertical section, and the other end of the channel transverse section is an exhaust member air outlet; the exhaust member is simple in structure and can be used for constructing an independent arc discharge channel; the utility model also relates to an arc extinguishing system comprising the exhaust member, which can quickly exhaust high-temperature and high-pressure gas generated by the breaking of the circuit breaker and avoid the explosion of the shell of the circuit breaker; the utility model also relates to a circuit breaker comprising the arc extinguishing system, and the circuit breaker has good breaking performance.

Description

Exhaust piece, arc extinguishing system and circuit breaker

Technical Field

The utility model relates to the field of low-voltage electricity, in particular to an exhaust piece, an arc extinguishing system comprising the exhaust piece and a circuit breaker comprising the arc extinguishing system.

Background

Along with the continuous improvement of breaking indexes of the circuit breaker, the size of the circuit breaker is gradually miniaturized, the air pressure inside an arc extinguish chamber is increased in the breaking process of the circuit breaker due to the limitation of the internal space of the circuit breaker, high-pressure high-temperature gas cannot be timely and quickly exhausted out of a shell of the circuit breaker by an exhaust structure of the circuit breaker, the shell is often exploded by the air flow generated by breaking, the air pressure inside the arc extinguish chamber is increased, electric arcs are prevented from entering the arc extinguish chamber, a contact system and an arc extinguishing system are continuously consumed by the electric arcs, and the breaking capacity of the circuit breaker is seriously restricted; in order to solve the above problems, in the prior art, high-temperature and high-pressure gas is often exhausted by designing an exhaust passage on a circuit breaker housing, but the structure of the circuit breaker housing is inevitably complicated, and the design and production of the circuit breaker housing are not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides an exhaust member which is simple in structure and can be used for constructing an independent arc discharge channel; the arc extinguishing system comprising the exhaust member is provided, high-temperature and high-pressure gas generated by the breaking of the circuit breaker can be exhausted quickly, and the explosion of a shell of the circuit breaker is avoided; the circuit breaker comprising the arc extinguishing system is good in breaking performance.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an exhaust piece, it includes the exhaust piece body and sets up the exhaust passage in the exhaust piece body, exhaust passage is including consecutive first passageway vertical section, the passageway changeover portion, vertical section of second passageway and the horizontal section of passageway, vertical section of first passageway and the vertical section parallel arrangement of second passageway, the vertical section of passageway changeover portion intercommunication first passageway and the vertical section of second passageway, the free end of the vertical section of first passageway is the exhaust piece air inlet, the one end and the vertical section intercommunication of second passageway of the horizontal section of passageway, the other end is the exhaust piece gas vent.

Preferably, the transverse section of the channel is in a U-shaped structure.

An arc extinguishing system of a circuit breaker comprises a circuit breaker shell and an arc extinguishing chamber, wherein the circuit breaker shell comprises a first mounting cavity, the arc extinguishing chamber is arranged in the first mounting cavity, and a first exhaust structure opposite to an outlet of the arc extinguishing chamber is arranged on the side wall of the first mounting cavity; the arc extinguishing system further comprises a second exhaust structure, the second exhaust structure comprises an exhaust piece, an exhaust piece air inlet is communicated with the first installation cavity, and an exhaust piece air outlet is communicated with the outside of the breaker shell.

Preferably, the circuit breaker housing further comprises a second mounting cavity arranged adjacent to the first mounting cavity, and the exhaust member is arranged in the second mounting cavity; the second exhaust structure further comprises a second exhaust window arranged on the side wall of the second mounting cavity, and the second exhaust window is correspondingly matched with the exhaust part exhaust port.

Preferably, the air inlet of the exhaust part is communicated with the first mounting cavity and correspondingly matched with the arc extinguish chamber, and the exhaust port of the exhaust part is correspondingly matched with the second exhaust window.

Preferably, the circuit breaker casing includes upper cover, upper base and the base that cooperates in proper order, and first installation cavity forms between upper cover and upper base, and the second installation cavity forms between upper base and base.

Preferably, the first exhaust structure is a first exhaust window, and zero flying arc hoods are arranged in the first exhaust window and the second exhaust window.

A circuit breaker comprises the arc extinguishing system.

Preferably, the circuit breaker further comprises a contact system arranged in the circuit breaker shell, the contact system comprises a moving contact and a static contact which are matched with each other, the moving contact is rotatably arranged in the first installation cavity, the static contact is arranged in the second installation cavity of the circuit breaker shell, and the static contact and the exhaust part are arranged side by side and are fixedly connected with each other.

Preferably, the static contact comprises a static conductive plate and a static contact, the static conductive plate comprises a static conductive plate matching portion, and the static contact is arranged on the static conductive plate matching portion; the matching part of the static conductive plate is opposite to the inlet of the exhaust member and is positioned between the exhaust member and the moving contact, and the rest part of the static conductive plate is arranged side by side with the exhaust member and is fixedly connected with the exhaust member.

Preferably, the contact system further comprises an arc striking structure which is arranged at an inlet of the exhaust member and electrically connected with the fixed contact; in the process of closing the moving contact and the static contact, the moving contact is firstly contacted and conducted with the arc striking structure and then closed with the static contact; in the breaking process of the moving contact and the static contact, the moving contact is firstly separated from the static contact and then separated from the arc striking structure.

Preferably, the arc striking structure comprises an arc striking piece which is rotatably arranged and electrically connected with the fixed contact, and the arc striking piece is in contact fit with the movable contact.

The exhaust member has simple structure, can be used for the arc discharge channel with independent components, and is beneficial to extinguishing the arc in the exhaust channel due to the fact that the exhaust channel of the exhaust member is provided with a plurality of bends.

According to the arc extinguishing system, the first exhaust structure and the second exhaust structure can rapidly exhaust high-temperature and high-pressure gas in the first mounting cavity, so that electric arcs can enter the arc extinguishing chamber to be extinguished, and the breaking performance of the circuit breaker is improved; moreover, the exhaust member is detachably mounted on the circuit breaker shell, so that the structure of the circuit breaker shell is simplified, the production difficulty of the circuit breaker shell is reduced, and the exhaust member is flexible to mount and dismount and convenient to dismount.

In addition, static and conductive board cooperation portion and striking structure all are located the entrance of air discharge spare, are favorable to breaking the electric arc gas that produces with the circuit breaker, especially the electric arc gas between striking spare and the explosion chamber, and the quick discharge through the air discharge spare that passes through will reduce the inside atmospheric pressure of circuit breaker, improve the arc extinguishing and the breaking performance of circuit breaker.

The circuit breaker comprises the arc extinguishing system, and the breaking performance is good.

Drawings

Fig. 1 is a schematic view of the structure of the circuit breaker of the present invention;

FIG. 2 is a schematic diagram of a contact system, an arc-extinguishing chamber and an exhaust member according to the present invention, wherein the moving contact and the stationary contact are in a closed state;

FIG. 3 is a schematic diagram of the contact system, arc extinguish chamber and exhaust member of the utility model, with the moving contact and the static contact in an open state;

FIG. 4 is a cross-sectional structural schematic view of the vent of the present invention showing a first channel vertical section, a channel transition section, and a second channel vertical section;

FIG. 5 is a schematic structural view of the vent of the present invention showing the transverse section of the passageway;

FIG. 6 is a schematic perspective view of the vent of the present invention showing the first channel vertical section, the vent securing protrusion and the vent attachment portion;

FIG. 7 is a perspective view of the vent of the present invention showing the cross-channel section and vent connection.

Detailed Description

The following describes the circuit breaker, the contact system of the circuit breaker and the arc extinguishing system of the circuit breaker according to the embodiments of the present invention with reference to fig. 1 to 7. The circuit breaker, the contact system of the circuit breaker and the arc extinguishing system of the circuit breaker of the present invention are not limited to the description of the following embodiments.

As shown in fig. 1, the circuit breaker of the present invention includes a circuit breaker housing, and a contact system and an arc extinguish chamber 3 disposed in the circuit breaker housing, wherein the contact system includes a moving contact 1 and a stationary contact 2 disposed in the circuit breaker housing, the moving contact 1 is rotatably disposed, and the stationary contact 2 is fixedly disposed and used in cooperation with the stationary contact 1. Furthermore, the circuit breaker also comprises an operating mechanism arranged in the shell of the circuit breaker, wherein the operating mechanism is connected with the moving contact in a driving way and drives the circuit breaker to switch on or switch off

The circuit breaker of the present invention is preferably a plug-in molded case circuit breaker, the operating mechanism of which is disposed at one end of the breaker case in the height direction, and the terminals (including the incoming terminal and the outgoing terminal) are disposed at the other end of the breaker case in the height direction. Specifically, as shown in fig. 1, the operating mechanism (not shown) is disposed at an upper end of the circuit breaker housing, and the terminal (not shown) is disposed at a lower end of the circuit breaker housing.

An important improvement of the circuit breaker of the utility model is that: the contact system further comprises an arc striking structure 4, the arc striking structure 4 comprises an arc striking piece 40 which is rotatably arranged and is electrically connected with the static contact 2, the arc striking piece 4 is positioned between the static contact 2 and the arc extinguishing chamber 3, the moving contact 1 comprises a moving conductive arm 1-0 and a moving contact 1-1 arranged on the moving conductive arm 1-0, and the static contact 2 comprises a static conductive plate 2-0 and a static contact 2-1 arranged on the static conductive plate 2-0; in the closing process of the moving contact 1 and the static contact 2, the moving conductive arm 1-0 is firstly contacted and conducted with the arc striking piece 40, and then the moving contact 1-1 and the static contact 2-1 are closed; in the breaking process of the moving contact 1 and the static contact 2, the moving contact 1-1 is separated from the static contact 2-1, and then the moving conducting arm 1-0 is separated from the arc striking piece 4. When the moving contact 1 and the static contact 2 of the circuit breaker are disconnected, electric arcs are generated between the moving conducting arm 1-0 and the arc striking piece 40, burning loss of the moving contact 1-1 and the static contact 2-1 is avoided or remarkably reduced, and the service life of a contact system can be remarkably prolonged.

Preferably, as shown in fig. 1 and 3, an open gap formed between the moving contact 1 and the static contact 2 after the moving contact 1 and the static contact 2 are disconnected is opposite to an inlet of an arc extinguishing chamber 3 of the circuit breaker.

As shown in fig. 1-3, the arc striking structure 4 further includes an arc striking member resetting member, and the arc striking member resetting member applies a resetting force to the arc striking member 40, so that the arc striking member 40 has a tendency of rotating towards the stationary contact 2, and when the movable contact 1-1 and the stationary contact 2-1 are separated, the arc striking member 40 is kept in contact with the movable conductive arm 1-0, that is, the arc striking member 40 is separated from the movable conductive arm 1-0 at the stationary contact 2. Further, as shown in fig. 1 and 3, after the movable conductive arm 1-0 is separated from the arc striking member 40, the arc striking member resetting member enables the arc striking member 40 to be abutted and matched with the static conductive plate 2-1 in a limiting way.

As shown in fig. 1 to 3, the arc striking member 40 is conducted with the stationary contact 2 through the arc striking member resetting member.

As another embodiment, the arc-striking part 40 and the arc-striking part resetting part are respectively conducted with the stationary contact 2.

As shown in fig. 1 to 3, is an embodiment of the striking member return member: the striking part reset piece is a spring piece 41, one end of the spring piece 41 is fixedly arranged and electrically connected with the static contact 2, and the other end of the spring piece 41 is in contact conduction with the striking part 40. Further, as shown in fig. 3, the spring plate 41 includes a spring plate fixing portion 41-0, a spring plate arc portion 41-1 and a spring plate matching portion 41-2, which are connected in sequence, the spring plate fixing portion 41-0 is fixed at one side of the static contact 2 and electrically connected thereto, an opening of the spring plate arc portion 41-1 is opposite to the arc striking member 40, and the spring plate matching portion 41-2 is in abutting fit with the arc striking member 40 (as shown in fig. 1-3, the spring plate matching portion 41-2 is preferably in abutting fit with a free end of the arc striking member 40). The spring piece 41 ensures the reliable contact between the arc striking piece 40 and the arc striking part 1-2 of the moving contact when the moving contact 1-1 is separated from the static contact 2-1, realizes the conduction between the arc striking piece 40 and the static contact 2, has simple structure, convenient assembly and small occupied space, and is beneficial to the miniaturization of the circuit breaker.

Preferably, as shown in fig. 1-3, the spring fitting portion 41-2 is in surface contact or line contact with the arc striking member 40, which is beneficial to improve the electrical conductivity at the joint of the arc striking member 40 and the spring 41.

Preferably, as shown in fig. 1 to 3, the spring plate fixing portion 41-0 is an arc-shaped structure, and is sleeved on the exhaust member fixing protrusion 5-4 of the exhaust member 5 and is pressed by the static conductive plate matching portion 2-00 of the static conductive plate 2-0. Of course, the spring plate fixing portion 41-0 may also be fixedly provided on the static conductive plate 2-0 or fixedly provided on the circuit breaker case.

As further examples, the striking member return member may be a spring (compression spring or extension spring) or a torsion spring.

As shown in fig. 2, is an embodiment of the arc ignition member 40: the arc striking piece 40 comprises an arc striking piece mounting part 40-0, an arc striking piece main body part 40-1 and an arc striking piece arc striking part 40-2 which are connected in sequence, the arc striking piece 40 is rotatably arranged through the arc striking piece mounting part 40-0, and the arc striking piece arc striking part 40-2 extends towards the arc extinguishing chamber 3 (the arc striking piece arc striking part 40-2 preferably extends towards the inlet of the arc extinguishing chamber 3) and is used for being in contact fit with the moving contact arc striking part 1-2. Further, as shown in fig. 2, after the moving contact arc-striking portion 1-2 is separated from the arc-striking member 40, the arc-striking member main body portion 40-1 is in limit fit with the static contact 2.

Preferably, as shown in fig. 2, the main body 40-1 of the arc striking member includes a main body side 40-4, and after the movable contact arc striking portion 1-2 is separated from the arc striking member 40, the main body side 40-4 is in contact with the end of the static conductive plate 2-0 (the main body side 40-4 is preferably in surface contact with the end of the static conductive plate 2-0).

Preferably, as shown in fig. 2, the arc striking part 40-2 of the arc striking member protrudes in a direction opposite to that of the moving contact 1 of the static contact 2, and the arc striking part 40-2 of the arc striking member includes an arc striking part inclined surface 40-3 facing the moving contact 1; as shown in fig. 2, in the breaking process of the moving contact 1 and the static contact 2, an electric arc 12 is generated between the inclined plane 40-3 of the arc striking part and the moving contact arc striking part 1-2, thereby avoiding or remarkably reducing burning loss to the moving contact 1-1 and the static contact 2-1.

Preferably, as shown in fig. 2, the arc striking part 40-2 of the arc striking member has a wedge-shaped structure, and the tip end of the wedge-shaped structure extends towards the arc extinguishing chamber 3, so that the arc can be rapidly introduced into the arc extinguishing chamber 3.

As shown in fig. 1-3, the moving contact 1 includes a moving contact arc-striking portion 1-2, and the moving contact arc-striking portion 1-2 is a moving contact protrusion disposed on a moving conductive arm 1-0. Specifically, as shown in fig. 1-3, the moving contact 1-1 is arranged at one end of a moving conductive arm 1-0, the other end of the moving conductive arm 1-0 is rotatably arranged, a moving contact protrusion and the moving contact 1-1 are arranged at the same end of the moving conductive arm 1-0, and the moving contact protrusion is positioned between the arc extinguish chamber 3 and the moving contact 1-1; after the moving contact 1 and the static contact 2 are closed, the moving contact bulge presses the arc striking piece 40.

Preferably, as shown in fig. 1 to 3, the moving contact arc-striking portion 1 to 2 extends toward the stationary contact 2, which is beneficial to reducing the space requirement of the moving contact 1. Further, as shown in fig. 2, when the movable contact 1-1 and the fixed contact 2-1 are closed, the movable contact protrusion is located between the arc striking member 40 and the fixed contact 2.

As another example, the movable contact arc-striking portion 1-2 may also extend towards the arc-extinguishing chamber 3 (the movable contact arc-striking portion 1-2 preferably extends towards the entrance of the arc-extinguishing chamber 3), which facilitates a more efficient introduction of the arc into the arc-extinguishing chamber 3.

Preferably, as shown in fig. 1 and 3, during the closing or breaking process of the moving contact 1 and the fixed contact 2, an arc starting point of movement is formed between the arc starting portion 1-2 of the moving contact and the arc starting member 40. Further, as shown in fig. 1 and 3, in the process of closing or breaking the moving contact 1 and the static contact 2, the distance between the arc striking part 1-2 of the moving contact and the arc striking element 40 is always smaller than the distance between the moving contact 1-1 and the static contact 2-1; in the closing process of the moving contact 1 and the static contact 2, the moving contact bulge is firstly contacted and conducted with the arc striking piece 40, and then the moving contact 1-1 and the static contact 2-1 are closed; in the breaking process of the moving contact 1 and the static contact 2, the moving contact 1-1 is firstly separated from the static contact 2-1, and then the arc striking part 1-2 of the moving contact is separated from the arc striking part 40.

As shown in fig. 1 to 3, the static conductive plate 2-0 includes a static conductive plate fitting portion 2-00, and the static contact 2-1 is provided on the static conductive plate fitting portion 2-00; the arc striking piece resetting piece is a spring piece 41, an arc striking piece mounting part 40-0 of the arc striking piece 40 and a spring piece fixing part 41-0 of the spring piece 41 are both arranged on one side of the static and conductive plate matching part 2-00, and the moving contact 2 is positioned on the other side of the static and conductive plate matching part 2-00.

Preferably, as shown in fig. 2, the static conductive plate 2-0 further includes a first static conductive plate vertical section 2-01, a static conductive plate transition section 2-02 and a second static conductive plate vertical section 2-03 which are connected in sequence, the first static conductive plate vertical section 2-01 is connected with the static conductive plate matching portion 2-00 in a bending manner, and the static conductive plate matching portion 2-00, the first static conductive plate vertical section 2-01 and the static conductive plate transition section 2-00 are integrally formed into a U-shaped or C-shaped structure.

Another important improvement of the circuit breaker of the present invention is: as shown in fig. 1, the circuit breaker further includes an arc extinguishing system, the arc extinguishing system includes a circuit breaker housing and an arc extinguishing chamber 3, the circuit breaker housing includes a first mounting cavity 11-0, the arc extinguishing chamber 3 is disposed in the first mounting cavity 11-0, and a first exhaust structure 10-0 opposite to an outlet of the arc extinguishing chamber 3 is disposed on a side wall of the first mounting cavity 11-0; the arc extinguishing system further comprises a second exhaust structure, the second exhaust structure further comprises an exhaust piece 5 which is detachably mounted on the breaker shell, one end (namely an exhaust piece air inlet) of the exhaust piece 5 is communicated with the first mounting cavity 11-0, and the other end (namely an exhaust piece air outlet) of the exhaust piece 5 is communicated with the outside of the breaker shell. The first exhaust structure and the second exhaust structure can quickly exhaust high-temperature and high-pressure gas in the first mounting cavity, arc can enter the arc extinguish chamber to be extinguished, and the breaking performance of the circuit breaker is improved; moreover, the exhaust member is detachably mounted on the circuit breaker shell, so that the structure of the circuit breaker shell is simplified, the production difficulty of the circuit breaker shell is reduced, and the exhaust member is flexible to mount and dismount and convenient to dismount.

As shown in fig. 1, the circuit breaker housing further includes a second installation cavity 11-1 disposed adjacent to the first installation cavity 11-0, and the exhaust member 5 is disposed in the second installation cavity 11-1. Further, as shown in fig. 1, the second exhaust structure further includes a second exhaust louver 10-1 disposed on a side wall of the second mounting cavity 11-1, and the second exhaust louver 10-1 is fitted opposite to an outlet end of the exhaust member 5.

As shown in fig. 1-5, the exhaust member 5 includes an exhaust channel disposed therein, one end of the exhaust channel is communicated with the first mounting cavity 11-0 and is correspondingly engaged with the arc-extinguishing chamber 3 (one end of the exhaust channel, i.e. an inlet of the exhaust member, preferably is correspondingly engaged with an inlet of the arc-extinguishing chamber 3), and the other end of the exhaust channel is correspondingly engaged with the second exhaust window 10-1.

As shown in fig. 4-5, an embodiment of the vent 5 is shown: the exhaust piece 5 comprises an exhaust piece body and an exhaust channel arranged in the exhaust piece body, the exhaust channel comprises a first channel vertical section 5-0, a channel transition section 5-1, a second channel vertical section 5-2 and a channel transverse section 5-3 which are sequentially connected, the first channel vertical section 5-0 and the second channel vertical section 5-2 are arranged in parallel (the first channel vertical section 5-0 is preferably offset to the direction of a second exhaust window 10-1 relative to the second channel vertical section 5-2), the free end of the first channel vertical section 5-0 is an exhaust piece air inlet, used for being communicated with the first installation cavity 11-0, one end of the channel transverse section 5-3 is communicated with the second channel vertical section 5-2, and the other end is provided with an exhaust part exhaust port which is used for being correspondingly matched with the second exhaust window 10-1.

Preferably, as shown in fig. 5, the channel transverse section 5-3 is a U-shaped structure, and the second channel vertical section 5-2 is communicated with the bottom of the U-shaped structure of the channel transverse section 5-3.

The exhaust channel is bent for multiple times, for example, the joint of the first channel vertical section 5-0 and the channel transition section 5-1, the joint of the channel transition section 5-1 and the second channel vertical section 5-2, and the joint of the second channel vertical section 5-2 and the channel transverse section 5-3 are beneficial to increasing the length of the exhaust channel, and simultaneously, electric arcs entering the exhaust channel are completely extinguished.

Preferably, as shown in fig. 1, the first channel vertical section 5-0 and the second channel vertical section 5-2 both extend along the height direction of the circuit breaker housing, and the extension direction of the channel transverse section 5-3 is perpendicular to the height direction of the circuit breaker housing.

As shown in fig. 4, the exhaust member body is further provided with a plurality of material stealing holes, so that the material consumption of the exhaust member 5 is saved, and the manufacturing cost is saved.

Preferably, as shown in fig. 1, the first exhaust structure 10-0 is a first exhaust window, and zero-flying-arc hoods are respectively arranged in the first exhaust window and the second exhaust window 10-1, wherein the zero-flying-arc hoods are metal mesh plates or metal hole plates.

Preferably, as shown in fig. 1, the circuit breaker housing includes an upper cover 6, an upper base 7 and a base 8, which are sequentially fitted, and a first mounting chamber 11-0 is formed between the upper cover 6 and the upper base 7 and a second mounting chamber 11-1 is formed between the upper base 7 and the base 8. Further, as shown in fig. 1, the upper base 7 includes an upper base partition plate, and an upper base avoiding hole 7-0 communicating the first installation cavity 11-0 and the second installation cavity 11-1 is formed in the upper base partition plate; the free end of the arc striking piece 40 passes through the base avoiding hole 7-0 and extends to the inlet of the arc extinguishing chamber 3, and the static contact 2-1 of the static contact 2 is positioned in the base avoiding hole 7-0 and matched with the movable contact 1-1 of the movable contact 1.

As shown in fig. 1, the moving contact 1 is rotatably disposed in a first mounting cavity 11-0, the static contact 2 is disposed in a second mounting cavity 11-1, and the static contact 2 and the exhaust member 5 are disposed side by side and fixedly connected to each other. Further, as shown in fig. 1-3, the static conductive plate fitting portion 2-00 is opposite to the inlet of the exhaust member 5 and is located between the exhaust member 5 and the movable contact 1, and the rest of the static conductive plate 2-0 is arranged side by side with the exhaust member 5 and is fixedly connected therewith.

Preferably, as shown in fig. 4, the exhaust member 5 further includes an exhaust member connection portion 5-5 for fixedly connecting the stationary contact 2, and the second stationary conductive plate vertical section 2-03 of the stationary conductive plate 2-0 is connected to the exhaust member connection portion 5-5.

Preferably, as shown in fig. 6, the exhaust member 5 includes a static contact limiting groove 5-7 disposed at one side of the vertical section 5-0 of the first channel, and the static conductive plate matching portion 2-00 is disposed in the static contact limiting groove 5-7 in a limiting manner; the exhaust part fixing bulge 5-4 is arranged in the static contact limiting groove 5-7, and one side of the first channel vertical section 5-0 facing the static conductive plate matching part 2-00 is provided with an opening. Specifically, as shown in fig. 1-4 and 6, a static conductive plate clamping groove is formed at the joint of the static conductive plate matching part 2-00 and a first static conductive plate vertical section 2-01 of the static conductive plate 2-0; the exhaust piece 5 further comprises exhaust piece clamping plates 5-6, and the exhaust piece clamping plates 5-6 are inserted into the static conductive plate clamping grooves; the free end of the static conductive plate matching part 2-00 is in limit matching with the side wall of the first channel vertical section 5-0. Further, as shown in fig. 1-4, the exhaust fixing protrusion 5-4 is located between the exhaust clamping plate 5-6 and the first channel vertical section 5-0.

Preferably, as shown in fig. 1-3, the arc ignition structure 4 is disposed at the inlet of the exhaust member 5.

The circuit breaker can realize the following technical effects: the static and conductive plate matching parts 2-00 and the arc striking structure 4 are located at the inlet of the exhaust part 5, so that arc gas generated by breaking of the circuit breaker, particularly arc gas between the arc striking part 40 and the arc extinguishing chamber 3, can be rapidly exhausted through the exhaust part 5, the internal air pressure of the circuit breaker can be reduced, and the arc extinguishing and breaking performance of the circuit breaker can be improved.

Preferably, as shown in fig. 1 to 4, the exhaust member 5 further includes an exhaust member fixing protrusion 5-4, and the spring piece fixing portion 41-0 of the spring piece 41 is defined between the static conductive plate fitting portion 2-00 of the static conductive plate 2-0 and the exhaust member fixing protrusion 5-4. It should be noted that the spring plate fixing portion 41-0 may also be directly fixedly or detachably connected to the static conductive plate matching portion 2-00, or the spring plate fixing portion 41-0 may be limited between the static conductive plate matching portion 2-00 and the circuit breaker housing.

As shown in fig. 1, it is a layout of the circuit breaker of the present invention: the upper cover 6, the upper base 7 and the base 8 are sequentially matched along the height direction of the breaker shell, and the first installation cavity 11-0 and the second installation cavity 11-1 are adjacently arranged along the height direction of the breaker shell; the arc extinguish chamber 3 is arranged in the first mounting cavity 11-0, the exhaust piece 5 is arranged in the second mounting cavity 11-1, and the arc extinguish chamber 3 and the exhaust piece 5 are arranged side by side along the height direction of the breaker shell; the moving contact 1 is rotatably arranged in the first mounting cavity 11-0, the static contact 2 is arranged in the second mounting cavity 11-1 and is arranged side by side with the exhaust member 5, and the static contact 2 is fixedly connected with the exhaust member 5; the first exhaust structure 10-0 and the second exhaust window 10-1 are arranged side by side along the height direction of the breaker shell and are positioned at the same side of the arc extinguish chamber 3 and the exhaust member 5, and the moving contact 1 and the static contact 2 are positioned at the other side of the arc extinguish chamber 3 and the exhaust member 5.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (12)

1. The exhaust piece comprises an exhaust piece body and an exhaust channel arranged in the exhaust piece body, wherein the exhaust channel comprises a first channel vertical section (5-0), a channel transition section (5-1), a second channel vertical section (5-2) and a channel transverse section (5-3) which are sequentially connected, the first channel vertical section (5-0) and the second channel vertical section (5-2) are arranged in parallel, the channel transition section (5-1) is communicated with the first channel vertical section (5-0) and the second channel vertical section (5-2), the free end of the first channel vertical section (5-0) is an exhaust piece air inlet, one end of the channel transverse section (5-3) is communicated with the second channel vertical section (5-2), and the other end of the channel transverse section is an exhaust piece air outlet.

2. The exhaust stack of claim 1, wherein: the transverse channel section (5-3) is of a U-shaped structure.

3. An arc extinguishing system of a circuit breaker comprises a circuit breaker shell and an arc extinguishing chamber (3), wherein the circuit breaker shell comprises a first mounting cavity (11-0), the arc extinguishing chamber (3) is arranged in the first mounting cavity (11-0), and a first exhaust structure (10-0) opposite to an outlet of the arc extinguishing chamber (3) is arranged on the side wall of the first mounting cavity (11-0); the method is characterized in that: the arc extinguishing system further comprises a second exhaust structure comprising an exhaust member (5) according to claim 1 or 2, the exhaust member inlet communicating with the first mounting chamber (11-0) and the exhaust member outlet communicating with the outside of the circuit breaker housing.

4. The arc extinguishing system of the circuit breaker of claim 3, wherein: the breaker shell further comprises a second mounting cavity (11-1) which is arranged adjacent to the first mounting cavity (11-0), and the exhaust piece (5) is arranged in the second mounting cavity (11-1); the second exhaust structure further comprises a second exhaust window (10-1) arranged on the side wall of the second mounting cavity (11-1), and the second exhaust window (10-1) is correspondingly matched with an exhaust port of an exhaust member.

5. The arc extinguishing system of the circuit breaker of claim 4, wherein: the exhaust part air inlet is communicated with the first mounting cavity (11-0) and correspondingly matched with the arc extinguish chamber (3), and the exhaust part air outlet is correspondingly matched with the second exhaust window (10-1).

6. The arc extinguishing system of the circuit breaker of claim 4, wherein: the breaker shell comprises an upper cover (6), an upper base (7) and a base (8) which are matched in sequence, a first installation cavity (11-0) is formed between the upper cover (6) and the upper base (7), and a second installation cavity (11-1) is formed between the upper base (7) and the base (8).

7. The arc extinguishing system of the circuit breaker of claim 4, wherein: the first exhaust structure (10-0) is a first exhaust window, and zero-flying-arc shields are arranged in the first exhaust window and the second exhaust window (10-1).

8. A circuit breaker, characterized in that it comprises an arc extinguishing system according to any one of claims 3-7.

9. The circuit breaker of claim 8, wherein: the circuit breaker further comprises a contact system arranged in the circuit breaker shell, the contact system comprises a moving contact (1) and a static contact (2) which are matched with each other, the moving contact (1) is rotatably arranged in a first installation cavity (11-0), the static contact (2) is arranged in a second installation cavity (11-1) of the circuit breaker shell, and the static contact (2) and the exhaust part (5) are arranged side by side and are fixedly connected with each other.

10. The circuit breaker of claim 9, wherein: the static contact (2) comprises a static conductive plate (2-0) and a static contact (2-1), the static conductive plate (2-0) comprises a static conductive plate matching part (2-00), and the static contact (2-1) is arranged on the static conductive plate matching part (2-00); the static conductive plate matching part (2-00) is opposite to the inlet of the exhaust member (5) and is positioned between the exhaust member (5) and the movable contact (1), and the rest part of the static conductive plate (2-0) is arranged side by side with the exhaust member (5) and is fixedly connected with the exhaust member.

11. The circuit breaker of claim 9, wherein: the contact system also comprises an arc striking structure (4) which is arranged at the inlet of the exhaust member (5) and is electrically connected with the static contact (2); in the closing process of the moving contact (1) and the static contact (2), the moving contact (1) is firstly contacted and conducted with the arc striking structure (4) and then closed with the static contact (2); in the breaking process of the moving contact (1) and the static contact (2), the moving contact (1) is firstly separated from the static contact (2) and then separated from the arc striking structure (4).

12. The circuit breaker of claim 11, wherein: the arc striking structure (4) comprises an arc striking piece (40) which is rotatably arranged and electrically connected with the static contact (2), and the arc striking piece (40) is in contact fit with the moving contact (1).

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