CN111092007B - A frame type circuit breaker arc striking and arc extinguishing device and contact arc extinguishing system - Google Patents

Abstract

The invention discloses a frame-type circuit breaker arc striking and extinguishing device and a contact arc extinguishing system, wherein the frame-type circuit breaker contact arc extinguishing system comprises the frame-type circuit breaker arc striking and extinguishing device, the lower end of an arc striking sheet in the frame-type circuit breaker arc striking and extinguishing device is provided with a contact system corresponding to the arc striking sheet, the contact system is arranged in an arc isolating cover, a contact support is arranged below the contact system, the left side and the right side of the contact support are respectively provided with a fixed splint, the left end and the right end of the arc isolating cover are respectively connected with the two fixed splints, the lower ends of the arc isolating cover and the contact support are arranged on a support, and a bus is arranged on the support. The arc striking and extinguishing device guides the arc into the contact arc extinguishing system, so that the breaking current and arc extinguishing performance of the contact system of the circuit breaker can be effectively improved, the burning loss of the main contact of the contact system is effectively reduced, the actual service life of the contact system is prolonged, and the actual service life cycle of the contact system and the circuit breaker is prolonged.

Description

A frame type circuit breaker arc striking and arc extinguishing device and contact arc extinguishing system

technical field

The invention relates to a frame type circuit breaker arc striking and arc extinguishing device and a contact arc extinguishing system, belonging to the technical field of low-voltage electrical appliances.

Background technique

Frame-type circuit breakers are important components in low-voltage power distribution systems. They are usually used as incoming main switches or branch main switches in distribution networks to distribute electrical energy, protect lines and power equipment from overloading. , undervoltage, short circuit, single-phase grounding and other fault hazards.

The frame circuit breaker is used for making, breaking and carrying rated working current and short-circuit, overload and other fault currents. When overload, short-circuit, voltage drop or disappearance occurs in the circuit, it can automatically cut off the circuit for reliable protection. The circuit breaker contact arc extinguishing system plays the role of breaking the main circuit current and short-circuit current of the carrying circuit.

The circuit breaker contact arc extinguishing system, especially the main contact breaking arc, directly affects the service life of the contact arc extinguishing system. Therefore, it is of great significance to effectively improve the breaking performance of the contact system and the arc striking effect of the arc extinguishing device, which can effectively improve the breaking index and the service life of the contact system, and prolong the actual service life of the circuit breaker.

The existing frame type circuit breaker contact arc extinguishing system is mainly composed of arc striker, arc extinguishing plate, arc blocking plate, arc extinguishing wall, contact support, contact spring, rotating shaft, fastener, bracket, busbar, fixed It is composed of splint, contact finger, contact, connecting rod, etc. When the circuit breaker works in the distribution circuit, the dynamic and static contacts of the circuit breaker are required to connect and break large normal or abnormal short-circuit and overload currents, so the circuit is broken. The circuit breaker contact arc extinguishing system not only needs to make and break normal or abnormal short-circuit and overload current, but also improve the breaking performance of the contact, so that the silver point of the contact finger is less burned and has a long life; the circuit breaker contact system After breaking, the fault arc can quickly enter the arc-striking and arc-extinguishing device, and is cut off and cooled by the arc-extinguishing strip to achieve the purpose of rapid arc-extinguishing and cooling, so that the degree of contact burnout is minimized and the service life is longest. In the prior art, the general contact system does not have an independent arc contact or/and an arc striking and arc extinguishing device arranged according to the arc contact. The contact system and the arc extinguishing system cannot cooperate well, and the breaking and arc extinguishing performance is not high. The electrical life and breaking life of the circuit breaker are not high.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: how to improve the degree of cooperation between the contact system and the arc extinguishing system, improve the breaking and arc extinguishing performance, and thus improve the electrical life and breaking life of the circuit breaker.

In order to solve the above technical problems, the technical solution of the present invention is to provide a frame type circuit breaker arc striking and arc extinguishing device, which is characterized in that it includes a right arc extinguishing wall and a left arc extinguishing wall, and the right arc extinguishing wall and the left arc extinguishing wall Fixedly connected together to form a cover, one side of the right arc-quenching wall and one side of the left arc-quenching wall are respectively connected to the left and right ends of the arc striker. Arc partitions are arranged between the arc extinguishing plates.

Preferably, the plurality of arc extinguishing plates and arc striking plates are arranged in parallel.

Preferably, the lower end of the arc striking piece is a main arc striking tongue and an auxiliary arc striking tongue corresponding to the contact fingers of the contact; the main arc striking tongue and the auxiliary arc striking tongue are arranged in a high and low manner.

Preferably, the arc striking sheet includes an arc striking plate located on the upper part, and the left and right sides of the arc striking sheet are provided with edges of the arc striking sheet.

A frame type circuit breaker contact arc extinguishing system is characterized in that it includes a frame type circuit breaker arc striking and arc extinguishing device, and the lower end of the arc striking plate in the frame type circuit breaker arc striking and arc extinguishing device is provided with a corresponding The contact system is set in the arc shield, the lower part of the contact system is provided with a contact support, the left and right sides of the contact support are provided with fixed splints, and the left and right ends of the arc shield are connected with two fixed splints The arc shield and the lower end supported by the contacts are arranged on a bracket, and a bus bar is arranged on the bracket.

Preferably, the contact system includes two types of contact fingers, namely, a contact finger with an arc contact and a contact finger without an arc contact, and the contact finger with an arc contact is provided with a first main contact The contact fingers without arc contacts are only provided with the second main contact, the contact fingers with arc contacts are located in the middle of the contact system, and the contact fingers without arc contacts are arranged symmetrically on both sides of the contact fingers with arcing contacts.

Preferably, the arc contacts are welded with contacts.

Preferably, the main arc-striking tongue and the auxiliary arc-striking tongue on the arc-striking sheet are respectively coupled and arranged with the topmost ends of the contact fingers with arcing contacts and the contact fingers without arcing contacts.

The invention can effectively improve the breaking current and arc extinguishing performance of the contact system of the circuit breaker, effectively reduce the burning loss of the main contact of the contact system, and improve the contact The actual service life of the contact system and the actual service life of the extended contact system as well as the circuit breaker.

Compared with the prior art, the present invention has the following advantages:

1. Simple structure, strong universality of parts, and easy installation;

2. The installation space size remains unchanged, and the breaking performance is high;

3. Good arc striking effect and long service life.

Description of drawings

Fig. 1 is the schematic diagram of a kind of frame type circuit breaker arc striking arc extinguishing device;

Fig. 2 is the internal structure diagram of a kind of frame type circuit breaker arc striking arc extinguishing device;

Fig. 3 is the schematic diagram of arc striker;

Figure 4 is a side view of a frame-type circuit breaker contact arc extinguishing system;

FIG. 5 is a partial cross-sectional view of the contact arc extinguishing system of the frame type circuit breaker.

Detailed ways

In order to make the present invention more obvious and comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

A frame type circuit breaker arc striking and arc extinguishing device of the present invention, as shown in FIGS. 1 to 3 , includes a right arc extinguishing wall 5 and a left arc extinguishing wall 6, and the right arc extinguishing wall 5 and the left arc extinguishing wall 6 pass through The riveting screws 4 are fixedly connected together to form an enclosure, one side of the right arc extinguishing wall 5 and one side of the left arc extinguishing wall 6 are respectively connected to the left and right ends of the arc striking piece 1, and a plurality of arc extinguishing are evenly distributed in the enclosure. Plate 2, between the top of the housing and the arc-extinguishing plate 2, an arc-blocking plate 3 is arranged. A plurality of arc extinguishing pieces 2 are arranged in parallel with the arc striking piece 1 .

The arc-striking and arc-extinguishing device is composed of arc-striking sheet 1, arc-extinguishing sheet 2, arc-blocking sheet 3, riveting screws 4, right arc-quenching wall 5, left arc-quenching wall 6, etc. The main arc-striking tongue 103 of arc-striking sheet 1 And the auxiliary arcing tongue 104 is coupled with the topmost ends of the two contact fingers (ie, the contact fingers 7 with arcing contacts and the contact fingers 8 without arcing contacts).

The lower end of the arc striking piece 1 is the main arc striking tongue 103 and the auxiliary arc striking tongue 104 corresponding to the contact fingers of the contact; the main arc striking tongue 103 and the auxiliary arc striking tongue 104 are arranged in a high and low manner. The arc striking plate 1 includes an arc striking plate 101 located at the upper portion, and the left and right sides of the arc striking plate 101 are provided with arc striking plate edges 102 .

As shown in Figure 4 and Figure 5, the frame type circuit breaker contact arc extinguishing system of the present invention consists of an arc striking sheet 1, an arc extinguishing sheet 2, an arc blocking sheet 3, a riveting screw 4, a right arc extinguishing wall 5, and a left arc extinguishing sheet. Arc wall 6, contact fingers with arc contacts 7, contact fingers without arc contacts 8, arc shield 9, contact supports 10, bus bars 11, brackets 12, fixed splints 13, fasteners 14, etc. The lower end of the arc striking blade 1 is provided with a corresponding contact system, the contact system is arranged in the arc shield 9, the contact support 10 is arranged below the contact system, and the left and right sides of the contact support 10 are provided with fixed The splint 13, the left and right ends of the arc shield 9 are respectively connected with the two fixed splints 13, the arc shield 9 and the lower end of the contact support 10 are arranged on the bracket 12, and the bracket 12 is provided with a bus bar 11. The two fixing clips 13 clamp the contact system by means of fasteners 14 .

The frame-type circuit breaker contact arc extinguishing system of the present invention has high breaking contacts, and the contact system has two kinds of contact fingers, namely, the contact fingers 7 with arc contacts and the contact fingers 8 without arc contacts. The contact finger 7 with arc contact has a first main contact 701 and an arc contact 702, and the arc contact 702 is also welded with contacts to improve the contact breaking performance of the arc contact 702; The contact finger 8 has only the second main contact 801, the contact finger 7 with the arc contact is installed in the middle position of the contact system, and the contact finger 8 without the arc contact is installed on both sides of the contact finger 7 with the arc contact Symmetrical arrangement.

When the contact arc extinguishing system of the frame type circuit breaker breaks the normal working current or abnormal short-circuit current, the movable contact 16 (as shown in Figure 4) of the contact arc extinguishing system of the circuit breaker is separated from the static contact 15. An arc is generated between the contacts, and the arc on the moving contact 16 is generated on the first main contact 701 and the arcing contact 702 of the contact finger 7 with the arcing contact. , the main arc on the moving contact 16 is transferred to the top of the arc contact 702 and the contact finger 7 with the arc contact, because the bending tongues of the arc striking piece 1 (ie the main arc striking tongue 103 and the auxiliary arc striking tongue 104) are different from the The top end of the contact finger is coupled and arranged, so the arc quickly enters the arc-striking and arc-extinguishing device A of the circuit breaker along the bending tongue of the arc-striking sheet 1, and is divided, cut off and cooled by the arc-extinguishing sheet to achieve rapid arc-striking and extinguishing. The purpose of the arc is to reduce the burning loss of the arc to the main contact of the contact finger and prolong the service life of the circuit breaker. The movable contact 16 includes a contact finger 7 with an arc contact, a contact finger 8 without an arc contact, an arc shield 9, a contact support 10, a bus bar 11, a bracket 12, a fixed splint 13, and a fastener 14 . The static contact 15 is arranged in front of the movable contact 16 .

Claims (6)

1. A frame-type circuit breaker contact arc extinguishing system, characterized in that it comprises a frame-type circuit breaker arc striking and arc-extinguishing device, and the frame-type circuit breaker arc striking and arc-extinguishing device comprises a right arc-extinguishing wall (5) and a left arc-extinguishing device. The wall (6), the right arc-extinguishing wall (5) and the left arc-extinguishing wall (6) are fixedly connected together to form a casing, and one side of the right arc-extinguishing wall (5) and one side of the left arc-extinguishing wall (6) are respectively The left and right ends of the arc-striking sheet (1) are connected, a plurality of arc-extinguishing sheets (2) are evenly distributed in the casing, and arc-cutting sheets (3) are arranged between the top of the casing and the arc-quenching sheet (2); The lower end of the arc-striking sheet (1) in the arc-striking and arc-extinguishing device of the type circuit breaker is provided with a corresponding contact system, the contact system is arranged in the arc shield (9), and the lower part of the contact system is provided with a contact support (10), the left and right sides of the contact support (10) are provided with fixed splints (13), the left and right ends of the arc shield (9) are respectively connected with the two fixed splints (13), and the arc shield (9) and The lower end of the contact support (10) is arranged on the bracket (12), and the bracket (12) is provided with a bus bar (11); the lower end of the arc striking sheet (1) is the main arc striking tongue (103) corresponding to the contact finger ) and an auxiliary arc-striking tongue (104); the contact system includes two kinds of contact fingers, namely, a contact finger (7) with an arcing contact and a contact finger (8) without an arcing contact; The main arc-striking tongue (103) and the auxiliary arc-striking tongue (104) on the arc sheet (1) are respectively coupled with the topmost ends of the contact fingers (7) with arc contacts and the contact fingers (8) without arc contacts layout. 2 . The contact arc extinguishing system of a frame type circuit breaker according to claim 1 , wherein the plurality of arc extinguishing sheets ( 2 ) and the arc striking sheet ( 1 ) are arranged in parallel. 3 . 3 . The contact arc extinguishing system of a frame type circuit breaker according to claim 1 , wherein the main arc striking tongue ( 103 ) and the auxiliary arc striking tongue ( 104 ) are arranged in a high and low manner. 4 . 4. A frame type circuit breaker contact arc extinguishing system according to claim 1, wherein the arc striking plate (1) comprises an arc striking plate (101) located on the upper part, and the arc striking plate (101) The left and right sides of the ) are provided with arc-starting plate edges (102). 5 . The arc extinguishing system for frame type circuit breaker contacts according to claim 1 , wherein the contact fingers ( 7 ) with arc contacts are provided with first main contacts ( 701 ) and The arc contact (702), the contact finger (8) without the arc contact is only provided with the second main contact (801), and the contact finger (7) with the arc contact is arranged in the middle position of the contact system, The contact fingers (8) without arc contacts are symmetrically arranged on both sides of the contact fingers (7) with arc contacts. 6 . The arc extinguishing system for frame type circuit breaker contacts according to claim 5 , wherein the arc contacts ( 702 ) are welded with contacts. 7 .

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