WO2022135039A1

WO2022135039A1 - N-pole wiring structure for circuit breaker

Info

Publication number: WO2022135039A1
Application number: PCT/CN2021/133618
Authority: WO
Inventors: 周维峰; 林凯; 胡广召
Original assignee: 浙江奥来电器有限公司
Priority date: 2020-12-25
Filing date: 2021-11-26
Publication date: 2022-06-30
Also published as: CN112635258A

Abstract

A circuit breaker, and in particular a connection manner of an N-pole wire inside the circuit breaker. The following technical solution is used: an N-pole wiring structure for a circuit breaker, wherein a wiring portion (11) of an N-pole stationary contact (1) is of a straight strip shape; a middle seat (4) or/and a base (5) is/are provided with a groove, and the wiring portion is arranged in the groove; and an arc guiding plate (3) comprises a straight edge (31), a vertical edge (32) and a bevel edge (33), the bevel edge being obliquely arranged towards the straight edge, an arc guiding area being formed between the bevel edge and an arc guiding portion (13) of the N-pole stationary contact, an N-pole power source inlet wire (8) being connected to an end portion of the straight edge, and a second wire (7) being connected to the end of the vertical edge that is close to a moving contact (2) or a joint between the vertical edge and the bevel edge. By using the solution, a circuit breaker is provided, so that an electric arc transfer speed is increased, the ablation by an electric arc is reduced, and the breaking capability is improved.

Description

N-pole wiring structure of a circuit breaker

technical field

The invention relates to a circuit breaker, in particular to a connection method of N-pole wires inside the circuit breaker.

Background technique

Due to the different standards of various countries, the distribution box of some countries requires the incoming side of the N pole and the outgoing side of the L pole and N pole to be set on the same side. The side and the N pole and L pole outlet side are set on the same side, but the current direction of the current loop is set incorrectly, so that the moving contacts cannot be quickly separated, and at the same time, the arc can not be better separated from the moving and static contacts, causing the contacts to burn. It is easy to find that the electrical clearance and creepage distance are insufficient, resulting in the failure of product verification after testing.

SUMMARY OF THE INVENTION

The present invention overcomes the problems existing in the prior art, and provides a method that no matter how the current direction changes when the current is interrupted, the moving contact will generate a larger repulsive force, so that the moving contact can be moved in the direction of repulsion. After the head is repelled, an arc is generated between the static contact and the moving contact, and the changing force direction of the arc is to move towards the arc striking part and the arc striking angle or move between the arc striking plate and the arc striking, so that the arc is under the action of the repulsive force. Move fast, increase the arc transfer speed, reduce the ablation of the arc, and improve the breaking capacity.

In order to achieve the above purpose, the present invention adopts the following technical scheme: an N-pole wiring structure of a circuit breaker, comprising an N-pole static contact, an N-pole moving contact, an arc-striking plate, a middle seat and a base, the N-pole The static contact includes a wiring part, a contact part and an arc striking part, the end of the wiring part is connected with a first wire, and the N-pole moving contact and the arc striking plate are connected with a second wire, so The arc striking board is also connected to the N-pole power supply incoming line, and it is characterized in that: the wiring part of the N-pole static contact is in the shape of a straight bar; In the card slot, the arc striking plate includes a straight side, a vertical side and a hypotenuse, wherein the hypotenuse is inclined to one side of the straight side, and an arc striking is formed between the hypotenuse and the arc striking part of the N pole static contact. In the area, the N-pole power input wire is connected to the end of the straight side, and the second wire is connected to the end of the vertical side close to the moving contact or at the junction of the vertical side and the hypotenuse.

By adopting the above scheme, when the N-pole arc is transferred from the moving contact to the arc-striking plate, a U-shaped current channel is formed between the N-pole power supply line and the arc-striking plate. According to the left-hand rule and the right-hand rule, no matter Regardless of the direction of the current, the arc moves in the direction of elongation, which is beneficial to extinguishing the arc and improving the breaking capacity.

A further arrangement of the present invention is that: the straight side and the vertical side of the arc striking plate are vertically arranged.

With the above solution, a U-shaped current channel is formed between the N-pole power supply line and the arc-striking plate, and the arc moves in the elongated direction, which is conducive to the extinguishing of the arc and improves the breaking capacity.

A further arrangement of the present invention is that: the corresponding parts of the middle seat and the base and located in the arc striking area are provided with raised ribs, and the setting direction of the raised ribs is the same as the setting direction of the hypotenuse of the arc striking plate.

Ribs are arranged on the base and the middle base, mainly for the purpose of increasing the creepage distance and electrical clearance.

A further arrangement of the present invention is: the arc striking portion of the N-pole static contact is arranged in an arched manner, an L-shaped first baffle plate is arranged on the middle seat and is located below and on one side of the arc extinguishing area, and the base is provided with an L-shaped first baffle plate. There is a second baffle that is inserted into the first baffle, the first baffle and the second baffle are inserted to form an arc-blocking edge, and the bottom edge of the first baffle is also provided with an exhaust through hole.

The above technical solution is adopted, wherein the arc striking part of the N-pole static contact is arched, so that the arc can be guided to go to the arc striking area, the arc isolation edge plays the role of isolating the arc, and the exhaust through hole can be well discharged Gas and arc, reduce the air pressure in the circuit breaker, prevent the product from bursting, and protect the circuit breaker.

The present invention will be further described below in conjunction with specific embodiments.

Description of drawings

1 is a perspective view of an embodiment of the present invention;

2 is a structural diagram reflecting the closure of the N-pole moving contact and the N-pole stationary contact according to an embodiment of the present invention;

3 is a structural diagram of a base according to an embodiment of the present invention;

4 is a structural diagram of a middle seat according to an embodiment of the present invention;

5 is a schematic diagram of the current direction and the repulsive force generated by the N-pole moving contact and the N-pole static contact according to an embodiment of the present invention;

6 is a schematic diagram of the current direction and the repulsive force generated between the arc striking plate and the N-pole static contact according to an embodiment of the present invention.

Detailed ways

As shown in Figures 1-4, an N-pole wiring structure of a circuit breaker includes N-pole static contact 1, N-pole moving contact 2, arc striking plate 3, middle seat 4 and base 5. The said The N pole static contact 1 includes a wiring part 11 , a contact part 12 and an arc striking part 13 , the end of the wiring part 11 is connected with a first wire 6 , the N pole moving contact 2 and the arc striking plate A second wire 7 is connected between 3, and the N-pole power supply inlet wire 8 is also connected to the arc-striking plate 3. In the embodiment of the present invention, the wiring portion 11 of the N-pole static contact 1 is a straight bar. The middle seat 4 or the base 5 is provided with a card slot, the wiring part 11 is placed in the card slot, and the arc striking plate 3 includes a straight edge 31, a vertical edge 32 and a hypotenuse 33, wherein the hypotenuse 33 is directed to the One side of the straight side 31 is inclined and arranged, and an arc striking area is formed between the oblique side 33 and the arc striking part 13 of the N pole static contact 1, and the N pole power supply wire 8 is connected to the end of the straight side 31, so The second wire 7 is connected to the end of the vertical side 32 close to the moving contact 2 or at the junction of the vertical side 32 and the hypotenuse 33, and the current flows from the second wire 7 to the N pole moving contact 2 and then flows through the N pole static. Contact 1, how the current direction of N pole moving contact 2 and N pole static contact 1 changes at this time, N pole moving contact 2 and N pole static contact 1 are arranged in a U shape, N pole moving contact 2 and N pole The pole static contact 1 is stressed in the separation direction, which is conducive to the rapid opening of the N pole moving contact 2, reducing the contact burnout, improving the electrical life and eliminating the possibility of contact welding, as shown in Figure 5. At the same time, It is also beneficial for the arc to move toward the arc striking portion 13 and the oblique side 33 . By adopting the above scheme, when the N-pole arc is transferred from the movable contact 2 to the arc-striking plate 3, a U-shaped current channel is formed between the N-pole power supply line 8 and the arc-striking plate 3 according to the left-hand rule and the right-hand rule. Then, regardless of the current direction, the arc moves in the direction of elongation, that is, moves to the arc striking area, which is beneficial to the extinguishing of the arc and improves the breaking capacity, as shown in Figure 6.

In the embodiment of the present invention, the straight side 31 and the vertical side 32 of the arc striking plate 3 are vertically arranged. With the above solution, a U-shaped current channel is better formed between the N-pole power supply line 8 and the arc striking plate 3, and the arc moves in the elongated direction, which is beneficial to extinguishing the arc and improving the breaking capacity. The corresponding parts of the middle seat 4 and the base 5 and located in the arc striking area are provided with

raised ribs

41 and 51. The setting direction of the raised

ribs

41 and 51 is the same as the setting direction of the hypotenuse 33 of the arc striking plate 3. Here, the It is roughly the same when it is the same, and does not need to be the same. It is mainly for the purpose of increasing the creepage distance and electrical clearance, and can generate gas when the arc passes, cool the arc, increase the pressure, increase the gas discharge speed, and improve the breaking capacity.

In the embodiment of the present invention, the arc striking portion 13 of the N-pole stationary contact 1 is arranged in an arched manner, and an L-shaped first baffle plate 42 is arranged on the middle seat 4 and located below and on one side of the arc extinguishing area. , the base 5 is provided with a second baffle 52 that is inserted into the first baffle 42, and the first baffle 42 and the second baffle 52 are inserted to form an arc-cutting edge. The first baffle The bottom edge of 42 is also provided with an exhaust through hole 421 . The above technical solution is adopted, wherein the arc striking portion 13 of the N-pole static contact 1 is arranged in an arched shape, so that the arc can be guided to go to the arc striking area, and the arc isolation edge plays the role of isolating the arc, and the exhaust through hole 421 can be very Good exhaust gas and arc, reduce the air pressure in the circuit breaker.

Claims

An N-pole wiring structure of a circuit breaker includes an N-pole static contact, an N-pole moving contact, an arc striking plate, a middle seat and a base, and the N-pole static contact includes a wiring part, a contact part and a base. Arc striking part, a first wire is connected to the end of the wiring part, a second wire is connected between the N-pole moving contact and the arc-striking plate, and the N-pole power supply inlet wire is also connected to the arc-striking plate , which is characterized in that: the wiring part of the N-pole static contact is in the shape of a straight bar, the middle seat or the base is provided with a card slot, the wiring part is placed in the card slot, and the arc striking plate includes a straight Side, vertical side and hypotenuse, wherein the hypotenuse is inclined to the side of the straight side, and an arc striking area is formed between the hypotenuse and the arc striking part of the N pole static contact, and the N pole power supply incoming line is connected to the straight side. At the end of the side, the second wire is connected to the end of the vertical side close to the movable contact or at the junction of the vertical side and the hypotenuse.
The N-pole wiring structure of the circuit breaker according to claim 1, wherein the straight side and the vertical side of the arc striking plate are vertically arranged.
The N-pole wiring structure of the circuit breaker according to claim 1 or 2, wherein the corresponding parts of the middle seat and the base and located in the arc striking area are provided with raised ribs, and the setting direction of the raised ribs is the same as that of the lead wires. The hypotenuse of the arc plate is set in the same direction.
The N-pole wiring structure of the circuit breaker according to claim 1 or 2, characterized in that: the arc striking part of the N-pole static contact is arranged in an arched manner, and the middle seat is located on and below the arc extinguishing area and One side is provided with an L-shaped first baffle plate, the base is provided with a second baffle plate that is inserted into the first baffle plate, and the first baffle plate and the second baffle plate are inserted into each other to form an arc dividing edge, so The bottom edge of the first baffle plate is also provided with an exhaust through hole.
The N-pole wiring structure of the circuit breaker according to claim 3, characterized in that: the arc striking part of the N-pole static contact is arranged in an arched manner, and the middle seat is located on the lower and one side of the arc extinguishing area. An L-shaped first baffle is provided, the base is provided with a second baffle that is inserted into the first baffle, the first baffle and the second baffle are inserted to form an arc-cutting edge, and the first baffle is inserted into the second baffle. The bottom edge of a baffle is also provided with an exhaust through hole.