Mechanical extrusion-type arc-extinguishing mechanism for power circuit breaker

Abstract

The invention belongs to the technical field of power circuit breakers, specially relates to a mechanical extrusion-type arc-extinguishing mechanism for a power circuit breaker. The arc-extinguishing mechanism includes a pressure bar, an electrical pendulum rod, an electrical fixed end, compression boards, a trigger lever, a pinch bar, a bottom conductive board and an upper conductive board. When the electrical pendulum rod is separated with the electrical fixed end, an electric arc is produced. Then the electric arc moves to the compression boards. At the same time, the electrical pendulum rod makes the trigger lever to move downward such that the trigger lever provides a downward force to the pinch bar. As a result, the pinch bar moves upwards and provides an upward force to the bottom conductive board. Then the bottom conductive board moves upwards along conductive board guide rails , which makes heat transfer cross-sectional area and heat storage capacity increased such that the electric arc is easier to be extinguished. When the pressure bar begins to move, the elastic end of the pressure bar is deformed. The deformation force produces time-delayed compression on the compression boards. When the electric arc enters into the spaces among the five compression boards, the electric arc is divided into four sections by the compression boards. At the same time, the distances between the compression boards are decreased therefore electric arc energy is released rapidly through the compression boards such that the electric arc is extinguished in short time. The mechanical extrusion-type arc-extinguishing mechanism has good arc extinguishing effect.

Description

[0001] Technical field [0002] The invention belongs to the technical field of electric circuit breakers, in particular to a mechanical extrusion type arc extinguishing mechanism of electric circuit breakers. Background technique [0003] A power circuit breaker is a switch that protects the short circuit, overload and leakage of the circuit in the electric power. It can cut off the circuit when the circuit short circuit, overload and leakage occur. The circuit is connected or closed. A high-temperature and high-heat arc will be generated between the moving contact and the static contact. If the arc cannot be quickly exported and extinguished, it will ablate the contact point between the two contacts and cause serious damage to the power circuit breaker shell. Large damage, more importantly, the arc will delay the disconnection of the circuit, causing irreparable losses; Short circuit is very important. In order to further increase the extinguishing effect on the sudden lar...

AI Technical Summary

Problems solved by technology

[0003] A power circuit breaker is a switch that protects the short circuit, overload and leakage of the circuit in the electric power. It can cut off the circuit when the circuit short circuit, overload and leakage occur. The circuit is connected or closed. A high-temperature and high-heat arc will be generated between the moving contact and the static contact. If the arc cannot be exported quickly and extinguished, it will ablate the contact point between the two contacts and cause serious damage to the housing of the power circuit breaker. Large damage, more importantly, the arc will delay the disconnection of the circuit, causing irreparable losses; Short circuit is very important

Images