A closed structure of circuit breaker arc extinguishing space

Abstract

The invention relates to a circuit breaker arc extinguishing space enclosing structure, which comprises a shell (1), a moving contact (2) and a static contact plate (3), and is characterized in that the shell (1) is provided with an enclosing rib plate (101), the moving contact (2) is installed in a moving contact sealing member (4), and the enclosing rib plate (101), the inner wall of the shell (1), the static contact plate (3) and the moving contact sealing member (4) form a closed space to enclose an arc extinguishing chamber (5) therein. The circuit breaker arc extinguishing space enclosing structure provided by the invention enables the moving and static contacts, the arc extinguishing chamber and even an air outlet to be isolated from other areas of the shell by improving the existing shell and moving contact installation structure so as to form a completely enclosed arc extinguishing space. The pressure in the enclosed space is higher, the formed back pressure is conducive to promoting electric arc to get into the arc extinguishing chamber more quickly, thereby shortening the arc extinguishing time, improving the arc extinguishing quality and further being capable of improving the breaking capacity of the circuit breaker at the same time.

Description

Technical field [0001] The invention belongs to the technical field of circuit breakers, and specifically relates to a closed structure of the arc extinguishing space of a circuit breaker, which can promote the arc to enter the arc extinguishing chamber faster and shorten the arc extinguishing time. Background technique [0002] Circuit breakers are an important part of power distribution appliances. They are mainly used in industrial low-voltage power systems. They are used to connect and break the current in the power grid circuit and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding, etc. The harm of failure. [0003] The function of the circuit breaker to break the overload or short circuit current is mainly completed by the arc extinguishing chamber installed in the circuit breaker. When a fault current occurs in the circuit, and the current value exceeds the set protection range of the intelligent controller, the operating m...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a closed structure for the arc extinguishing space of the circuit breaker in view of the technical defect that the arc extinguishing chamber of the existing miniature circuit breaker communicates with other spaces inside the housing, so that the arc cannot be pushed completely into the arc extinguishing chamber. The improvement of the installation structure of the shell and the moving contact makes the moving and static contacts, the arc extinguishing chamber and the gas outlet isolated from other areas of the shell, forming a completely closed arc extinguishing space, the pressure in the closed space is higher, and the back pressure formed is favorable Push the arc into the arc extinguishing chamber faster and shorten the arc extinguishing time

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