CN213905274U

CN213905274U - Arc extinguishing mechanism of circuit breaker

Info

Publication number: CN213905274U
Application number: CN202023118598.4U
Authority: CN
Inventors: 魏文杰; 李海茭; 祁卫华; 许利战; 卿广林
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-08-06
Anticipated expiration: 2030-12-22

Abstract

The utility model relates to a circuit breaker arc extinguishing mechanism, include the circuit breaker casing and install the moving contact in the circuit breaker casing, the static contact, first striking piece, second striking piece and explosion chamber, the runway is constituteed to first striking piece and second striking piece relative setting, the explosion chamber is located the one end of runway, the disconnected position of moving contact and static contact is located the other end of runway, the static contact is connected to the one end of first striking piece, the explosion chamber is connected to the other end, be equipped with U type striking on the second striking piece, the both sides of this U type striking piece are stretched out the board and are located the both sides that the moving contact removed the route symmetrically of each other, after moving contact and static contact are separately, the moving contact slides into two and stretches out between the board, the electric arc that static contact and moving contact disconnection produced is stretched out the board through two and is jumped to the runway. Compared with the prior art, the utility model has the advantages of accelerate electric arc from the contact to the jump speed of runway, alleviate the ablation of electric arc to the contact electric shock.

Description

Arc extinguishing mechanism of circuit breaker

Technical Field

The utility model belongs to the technical field of the circuit breaker and specifically relates to a circuit breaker arc extinguishing mechanism is related to.

Background

The existing arc extinguishing mechanism of the circuit breaker generally comprises a circuit breaker shell, a moving contact, a fixed contact, two arc striking plates and an arc extinguishing chamber, wherein the moving contact, the fixed contact, the two arc striking plates and the arc extinguishing chamber are installed in the circuit breaker shell. When the moving contact and the static contact of the circuit breaker are disconnected, electric arcs generated between the moving contact and the static contact enter an arc extinguish chamber through an arc runner formed by two arc striking sheets.

For example, chinese patent application publication No. CN109755079A discloses an arc extinguishing apparatus for a circuit breaker, which reduces damage of an arc to the circuit breaker by arranging a yoke at one end of an arc striking piece to push the arc to accelerate the moving speed of the arc in an arc chute. However, the conventional structure has the following problems:

the arc that moving contact and static contact disconnection produced just takes place to jump the arc when the moving contact separates completely, jumps to the striking piece from the moving contact in the one end root of arc, and the arc has burnt for a long time between the contact this moment, ablates the contact easily, leads to harm such as electric touch and inside plastic housing harm.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a circuit breaker arc extinguishing mechanism in order to overcome the defect that above-mentioned prior art exists for electric arc from the contact to the jump speed of runway arc, alleviate the ablation that electric arc electrocuted to the contact.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a circuit breaker arc extinguishing mechanism, includes circuit breaker casing and installs the moving contact in the circuit breaker casing, static contact, first striking piece, second striking piece and explosion chamber, first striking piece and second striking piece set up relatively and constitute the runway, the explosion chamber is located the one end of runway, the moving contact with the disconnected position of static contact is located the other end of runway, the static contact is connected to the one end of first striking piece, and the explosion chamber is connected to the other end, be equipped with U type striking piece on the second striking piece, the both sides of this U type striking piece stretch out the board and are located the both sides of moving contact moving path mutually symmetrically, and after moving contact and static contact divide separately, the moving contact slides into between two stretch out the board, and the electric arc that static contact and moving contact disconnection produced jumps to the runway in through two stretch out boards.

Further, U type striking spare and second striking piece formula structure as an organic whole, the both sides of second striking piece are connected with and stretch out the partly U type striking spare of constituteing jointly of board and second striking piece body.

Furthermore, the two side extending plates of the U-shaped arc striking piece are parallel to each other.

Furthermore, the extending plate of the U-shaped arc striking piece is a long strip plate.

Furthermore, the extension plate of the U-shaped arc striking piece is an arc-shaped plate, and the curvature of the arc-shaped plate is attached to the moving path of the moving contact.

Further, still include and produce gas piece and flash barrier, set up the both sides in the runway respectively.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses a be equipped with U type striking spare on the second striking piece to the both sides of U type striking spare are stretched out the board and are located the both sides that the moving contact removed the route symmetrically mutually. When the moving contact and the static contact are separated, the moving contact slides into the space between the two side extension plates of the U-shaped arc striking part, and the generated electric arc can jump to the U-shaped arc striking part and enter the arc runner at once, so that the effect of reducing the electric arc ablation contact is achieved.

2. After the switch is switched off, electric arcs between the moving contact and the fixed contact are equivalent to a lead and can generate magnetic fields around, the magnetic conductivity of the U-shaped arc striking part is smaller than that of air, so that the magnetic fields preferentially enter the U-shaped arc striking part to circulate, and the magnetic fields have convergence, so that the electric arcs are quickly attracted to be close to the U-shaped arc striking part, and arc jumping is realized. At the same time, this process can reduce the energy of the arc itself, weakening the arc intensity.

3. Gas generating pieces and arc isolating plates are arranged on two sides of the arc runner, so that the arc extinguishing performance is improved, and the safety is enhanced.

Drawings

Fig. 1 is a schematic structural diagram of the first embodiment.

Fig. 2 is a partially exploded view of the arc extinguishing mechanism.

Fig. 3 is a schematic diagram of the principle of arc extinction.

Fig. 4 is a schematic view of the magnetic flux principle of the U-shaped arc striking piece.

Reference numerals: 1. moving contact, 2, static contact, 3, first striking, 4, second striking, 5, explosion chamber, 6, U type striking, 61, the board that stretches out, 7, the piece of producing gas, 8, flash barrier, 9, electric arc.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example one

As shown in fig. 1 and fig. 2, the present embodiment provides an arc extinguishing mechanism for a circuit breaker, which includes a circuit breaker housing, and a movable contact 1, a fixed contact 2, a first arc striking plate 3, a second arc striking plate 4, and an arc extinguishing chamber 5 installed in the circuit breaker housing. The first arc striking piece 3 and the second arc striking piece 4 are oppositely arranged to form an arc runner, the arc extinguish chamber 5 is positioned at the lower end of the arc runner, and the breaking position of the moving contact 1 and the static contact 2 is positioned at the upper end of the arc runner. The upper end of the first arc striking piece 3 is connected with the static contact 2, and the lower end is connected with the inside of the arc extinguish chamber 5. The lower end of the second arc striking piece 4 is connected with the inside of the arc extinguishing chamber 5, and the upper end is provided with a U-shaped arc striking piece 6.

U type striking 6 and 4 formula structures as an organic whole of second striking piece specifically are: two symmetrical extending plates 61 are arranged on two sides of the upper end of the second arc striking plate 4. The extension plate 61 is a long plate. The two protruding plates 61 and a part of the body of the second arc striking plate 4 jointly form a U-shaped arc striking part 6. The opening and closing angles of the two protruding plates 61 are not limited, and are preferably arranged parallel to each other and perpendicular to the second tab 4 body. The protruding plates 61 are located on both sides of the moving path of the movable contact 1. When the moving contact 1 and the static contact 2 are separated, the moving contact 1 slides into the space between the two extending plates 61 of the U-shaped arc striking part 6, the generated electric arc can jump to the U-shaped arc striking part 6 and enter an arc runner, and the effect of reducing the electric arc ablation of the contact is achieved.

The gas generating sheet 7 and the flash barrier 8 are respectively arranged on two sides of the arc runner.

The working principle of this embodiment is described in fig. 3:

when the contacts of the moving contact 1 are separated from the contacts of the stationary contact 2, an arc 9 is generated therebetween. The magnetic flux generated by the arc 9 will enter the U-shaped arc ignition element 6 through the two protruding plates 61. The principle is shown in fig. 4: the electric arc is equivalent to a wire and can generate a magnetic field around, the magnetic permeability of the U-shaped arc striking piece is smaller than that of air, so that the magnetic field preferentially enters the U-shaped arc striking piece to circulate, and the magnetic field lines representing the magnetic field have convergence and tend to be annular, so that the electric arc is quickly attracted to be close to the U-shaped arc striking piece, and arc jumping is realized. Therefore, the electric arc 9 jumps to the extending plate 61 under the combined action of the suction force of the U-shaped arc striking piece 6 and the electric power generated between the contacts, and then the arc root of the electric arc 9 enters the arc extinguishing chamber 5 through an arc runner on the first arc striking piece 3 and the second arc striking piece 4 respectively. When passing through the arc runner, the gas generating sheet 7 generates a large amount of gas under the high-temperature heating of the electric arc 9, the gas has the functions of boosting and cooling the movement of the electric arc 9, then the electric arc 9 is divided into a plurality of short arcs by the arc extinguishing chamber 5, the short arcs are cooled and extinguished, and then electrons, particles, gas and impurities run out of the shell.

Example two

The difference between the present embodiment and the first embodiment is: the arc-shaped plate is adopted as the extension plate in the U-shaped arc striking part, the curvature of the arc-shaped plate is attached to the moving path of the moving contact, and the arc jumping speed of the electric arc is further improved.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A circuit breaker arc extinguishing mechanism comprises a circuit breaker shell, a movable contact (1), a fixed contact (2), a first arc striking piece (3), a second arc striking piece (4) and an arc extinguishing chamber (5), wherein the movable contact (1), the fixed contact (2), the second arc striking piece (4) and the arc extinguishing chamber (5) are arranged in the circuit breaker shell in an opposite mode to form an arc runner, the arc extinguishing chamber (5) is located at one end of the arc runner, breaking positions of the movable contact (1) and the fixed contact (2) are located at the other end of the arc runner, the circuit breaker arc extinguishing mechanism is characterized in that one end of the first arc striking piece (3) is connected with the fixed contact (2), the other end of the first arc striking piece is connected with the arc extinguishing chamber (5), a U-shaped arc striking piece (6) is arranged on the second arc striking piece (4), extending plates (61) on two sides of the U-shaped arc striking piece (6) are symmetrically located on two sides of a moving path of the movable contact (1), and after the movable contact (1) and the fixed contact (2) are separated, the moving contact (1) slides into the space between the two extending plates (61), and electric arcs generated by disconnecting the static contact (2) and the moving contact (1) jump into the arc runner through the two extending plates (61).

2. The arc extinguishing mechanism of the circuit breaker according to claim 1, characterized in that the U-shaped arc striking piece (6) and the second arc striking piece (4) are of an integral structure, and the two sides of the second arc striking piece (4) are connected with the protruding plate (61) and a part of the body of the second arc striking piece (4) to jointly form the U-shaped arc striking piece (6).

3. An arc extinguishing mechanism for a circuit breaker according to claim 1, characterized in that the protruding plates (61) on both sides of the U-shaped arc striking member (6) are parallel to each other.

4. The arc extinguishing mechanism for circuit breakers according to claim 1, characterized in that the projecting plate (61) of the U-shaped arc striking member (6) is a strip.

5. An arc extinguishing mechanism of a circuit breaker according to claim 1, characterized in that the protruding plate (61) of the U-shaped arc striking part (6) is an arc-shaped plate, and the curvature of the arc-shaped plate is in accordance with the moving path of the movable contact (1).

6. The arc extinguishing mechanism of the circuit breaker according to claim 1, characterized in that the arc extinguishing mechanism further comprises a gas generating piece (7) and an arc isolating plate (8) which are respectively arranged at two sides of the arc runner.