Circuit breaker with automatic switch-on and switch-off functions

Abstract

The invention discloses a circuit breaker with automatic switch-on and switch-off functions. The circuit breaker comprises a shell, a driving motor, a linkage worm wheel, a linkage gear, an output main shaft, a trip linkage part and a circuit board; the driving motor and the linkage worm wheel are in linkage; the linkage worm wheel is in linkage with the trip linkage part and drives the trip linkage part to turn in a reciprocating manner; a shifting rod is arranged on the trip linkage part; the output main shaft is fixed in the center of the linkage gear; the linkage worm wheel is meshed withthe linkage gear; a moving contact is arranged on the contact surface of the linkage worm wheel and a circuit board; an open circuit static contact and an access static contact are arranged on the corresponding contact surfaces of the circuit board receptively; and the distances from the open circuit static contact and the access static contact to the central shaft of the linkage worm wheel are matched with the distance from the moving contact to the central shaft of the linkage worm wheel. By virtue of effective improvement of the moving contact structure by the circuit breaker, the improvedstatic and static contacts are more stable in structure and high in contact; the service life of the equipment is prolonged; and influences caused by electromagnetic interference and the like can be reduced.

Description

technical field [0001] The invention relates to the technical field of small circuit breakers, in particular to an automatic opening and closing circuit breaker with good on-off contact. Background technique [0002] According to the demand for intelligent power supply network in my country, the State Grid Corporation requires intelligent power supply network. Therefore, it is necessary to use the terminal actuator of the power supply network, that is, the miniature circuit breaker to perform the upper-end signal and have the kinetic energy of tripping and closing. Therefore, the current development trend of the miniature circuit breaker is to have the traditional manual opening and closing record. In addition to the overcurrent and overload automatic tripping function , It also needs to have the function of electric opening and closing, that is, it can automatically open and close and realize remote control, especially combined with smart electricity, to realize the functio...

AI Technical Summary

Problems solved by technology

[0003] The State Intellectual Property Office has disclosed an invention patent with the application number CN201610264851.6 and the name "Automatic Opening and Closing Miniature Circuit Breaker", which discloses that the contact structure on the circuit board is parallel to the moving blade and the stationary blade, and the contact The points are respectively set on the moving and stationary blades, and the moving and stationary blades are electrically connected to the corresponding lines on the circuit board through the pins, and the rotating boss is driven to rotate by the linkage turbine to rotate the moving blades, so that the moving blades and the stationary blades are in contact to form The conduction of the circuit, when the external force is removed, the moving blade and the stationary blade are separated under the action of the elastic force, so that the circuit between the moving blade and the stationary blade is disconnected. Light and thin, the induction accuracy is not high, and it is prone to sticking after power-on. At the same time, after a long period of use, the moving and stationary blades are prone to deformation. At the same time, in the face of magnetic interference, this blade form is also likely to cause poor contact. , causing inconvenience to users and affecting the use of equipment

Images