CN-122000253-A - Arc extinguishing chamber structure

CN122000253ACN 122000253 ACN122000253 ACN 122000253ACN-122000253-A

Abstract

The invention provides an arc extinguishing chamber structure, wherein an airflow passage area is arranged from a separation position of a moving contact and a fixed contact to the edge position of the lower side end part of an arc extinguishing grid sheet group, a flow guide piece is arranged in the airflow passage area, and the flow guide piece divides the airflow passage area into at least 2 sub-passages. The flow guide piece is arranged on the arc channel of the moving and static contact breaking arc entering the arc extinguishing chamber, so that the arc channel is divided into a plurality of sub-channels, the eddy current phenomenon is reduced, the arc feet of the arc move smoothly towards the arc extinguishing chamber, and the breaking performance of the circuit breaker is improved.

Inventors

YANG HOUWEN
GONG ZUOYONG
LI BING
PENG QIONG
ZHENG LIZHI

Assignees

上海良信电器股份有限公司
良信电器(海盐)有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (13)

1. An arc extinguishing chamber structure, wherein an airflow channel area (a) is arranged between a separation position of a moving contact (2) and a fixed contact (3) and an arc extinguishing grid sheet group (101) of an arc extinguishing chamber (1), is characterized in that a flow guiding piece (4) is arranged in the airflow channel area (a), and the flow guiding piece (4) divides the airflow channel (a) into at least 2 sub-channels.
2. The arc extinguishing chamber structure according to claim 1, wherein the arc extinguishing chamber (1) comprises a supporting plate (102), a gas generating piece (103) is arranged on the bottom surface of the supporting plate (102), an arc extinguishing grid sheet group (101) is inserted on one side, far away from a separation area of a moving contact (2) and a fixed contact (3), of the gas generating piece (103), a fixed arc striking plate (101 a) is arranged at one side end, corresponding to the fixed contact (3), of the arc extinguishing grid sheet group (101), a moving arc striking plate (101 b) is arranged at one side end, corresponding to the moving contact (2), of the arc extinguishing grid sheet group (101), the moving arc striking plate (101 a) extends to the end, corresponding to the fixed contact (3), of the moving contact (2), the moving arc striking plate (101 b) corresponds to the moving contact (2) at the maximum breaking position, and an upper opening formed by the moving arc striking plate (101 b) and the fixed arc striking plate (101 a) is larger than a lower opening.
3. The arc extinguishing chamber structure according to claim 2, wherein the movable arc striking plate (101 b), the static arc striking plate (101 a), the supporting plate (102), the gas generating piece (103), the separation position of the movable contact (2) and the static contact (3), the arc extinguishing grid plate group (101) are surrounded to form an air flow channel area (a), and the part of the arc extinguishing grid plate group (101) surrounded to form the air flow channel area (a) forms the upper side of the air flow channel area (a).
4. An arc chute structure as claimed in claim 3, characterized in that a gap is provided between the flow guide (4) and the upper side of the gas flow channel region (a).
5. An arc chute structure as claimed in claim 4, characterized in that the gas flow channel (a) is divided into a central gas flow area (a 1) and left (a 2) and right (a 3) gas flow areas on both sides of the central gas flow area (a 1), at least one flow guide (4) being located in the left gas flow area (a 2) and/or at least one flow guide (4) being located in the central gas flow area (a 1) and/or at least one flow guide (4) being located in the right gas flow area (a 3).
6. An arc extinguishing chamber structure according to claim 5, characterized in that at least one arc extinguishing gate sheet (101 c) in the middle of both end sides of the portion of the arc extinguishing gate sheet group (101) surrounding the airflow passage area (a) extends toward one end side of the arc extinguishing chamber (1) near the separation area of the moving contact (2) and the fixed contact (3), and the area where the at least one arc extinguishing gate sheet (101 c) is located corresponds to the middle airflow area (a 1).
7. An arc extinguishing chamber structure according to claim 6, characterized in that at least one flow guiding member (4) is located in the right air flow area (a 3), and the projection of the part of each flow guiding member (4) corresponding to the middle air flow area (a 1) and surrounding the air flow passage area (a) of at least one arc extinguishing grid sheet (101 c) on the plane of the bottom surface of the supporting plate (102) in the length direction of the arc extinguishing grid sheet group (101) is at least partially overlapped.
8. An arc extinguishing chamber structure according to claim 7, characterized in that at least one flow guiding member (4) is located in the left air flow area (a 2), and the projection of the part of each flow guiding member (4) corresponding to the middle air flow area (a 1) and surrounding the air flow passage area (a) of at least one arc extinguishing grid sheet (101 c) on the plane of the bottom surface of the supporting plate (102) in the length direction of the arc extinguishing grid sheet group (101) is at least partially overlapped.
9. An arc chute structure as claimed in claim 6, wherein the slot (101 c 01) of said at least one arc chute sheet (101 c) is elongated downwardly.
10. An arc chute structure as claimed in claim 3, characterized in that said flow guide member (4) is mounted on said gas generating member (103) or on said support member (102).
11. An arc extinguishing chamber structure according to claim 10, characterized in that the flow guiding members (4) are metal members or nonmetal members, and the corresponding flow guiding members (4) are integrally formed with the support plate (102) or fixed on the support plate (102), or the corresponding flow guiding members (4) are integrally formed with the gas generating member (103) or fixed on the gas generating member (103).
12. An arc chute structure as claimed in claim 1, characterized in that said flow guide (4) is provided with an air port (401).
13. An arc chute structure as claimed in claim 1, characterized in that the shape of the flow guide (4) is square or triangular or trapezoidal or profiled.

Description

Arc extinguishing chamber structure Technical Field The invention belongs to the technical field of circuit breakers, and particularly relates to an arc extinguishing chamber structure. Background In an industrial low-voltage power system, a circuit breaker is used as an important component in a power distribution network for distributing electric energy, switching on and off current in a power grid circuit, protecting circuits and power supply equipment from damage caused by faults such as overload, undervoltage, short circuit, single-phase grounding and the like, and is an important component of a power supply system. The low-voltage circuit breaker mainly comprises a controller, a contact system, an arc extinguish chamber, an operating mechanism and the like, wherein the arc extinguish chamber is a very important functional component of the low-voltage circuit breaker, and the performance of the arc extinguish chamber is related to the electrical life and breaking capacity of the circuit breaker. The existing breaker arc-extinguishing chamber drives an arc to enter the arc-extinguishing chamber by means of a magnetic field generated by a contact conductive loop and air blowing generated by expanding gas during breaking, and long arcs are cut into multiple sections of short arcs through grid plates, so that arc voltage is improved, and arc extinction is realized. Along with the improvement of the voltage class of the new energy system, the requirement of high-voltage breaking is provided for the circuit breaker. Along with the improvement of the power supply voltage, the number of arc extinguishing grid plates of the arc extinguishing chamber is required to be gradually increased to improve the arc extinguishing capability of the arc extinguishing chamber, but the increase of the number of the arc extinguishing grid plates is limited, in a limited space, the increase of the opening distance of the circuit breaker is limited, in order to increase the opening distance of the circuit breaker, a moving contact and a fixed contact are required to be arranged at a position far away from the arc extinguishing chamber, and in order to guide an arc generated by breaking the moving contact and the fixed contact into the arc extinguishing chamber, as shown in a figure 1, a moving arc striking plate and a fixed arc striking plate are generally required to be arranged at two ends of the arc extinguishing grid plates, but the inclination angles of the moving arc striking plate and the fixed arc striking plate are relatively large, the arc can exist in the arc striking process, the phenomenon that arc roots are not transferred occurs, the stagnation of the arc roots can not lead to the low utilization rate of the arc extinguishing grid plates at two ends of the arc extinguishing chamber, the whole arc pressure is low, and the arc extinguishing is unsuccessful, so that the circuit breaker fails to break. Disclosure of Invention The invention aims to provide an arc extinguishing chamber structure aiming at the defects that an arc extinguishing chamber of the existing circuit breaker, particularly an arc extinguishing chamber for breaking a high-voltage circuit breaker, has an eddy current phenomenon in the arc striking process, an arc root is not transferred, and further, the arc extinguishing is unsuccessful, so that the circuit breaker fails to break, and a flow guide piece is arranged on an arc channel of a moving and static contact breaking arc entering the arc extinguishing chamber, so that the arc channel is divided into a plurality of sub channels, the eddy current phenomenon is reduced, and an arc foot of the arc smoothly moves towards the direction of the arc extinguishing chamber, so that the breaking performance of the circuit breaker is improved. Technical proposal In order to achieve the technical purpose, the invention provides an arc extinguishing chamber structure, wherein an airflow passage area is arranged between a moving contact and a fixed contact and between an arc extinguishing grid sheet set, and the arc extinguishing chamber structure is characterized in that a flow guide piece is arranged in the airflow passage area and divides an airflow passage into at least 2 sub-passages. In one embodiment, the arc extinguishing chamber comprises a supporting plate, the gas generating part is arranged on the bottom surface of the supporting plate, the arc extinguishing grid sheet group is inserted on one side, far away from the separation area of the moving contact and the fixed contact, of the gas generating part, a static arc striking plate is arranged at one side end, corresponding to the fixed contact, of the arc extinguishing grid sheet group, a moving arc striking plate is arranged at one side end, corresponding to the moving contact, of the arc extinguishing grid sheet group, the moving arc striking plate extends to the position, corresponding to the moving contact, of the moving contact end, correspon