Improved hydraulic electromagnetic breaker

Abstract

The invention relates to an improved hydraulic electromagnetic breaker, which consists of a shell, a wire connecting terminal, a magnetic coil, an operator and an armature, wherein an oil damper is arranged in the electromagnetic coil. A moving contact arm, a folding connection rod and a crank form a three-rod structure, and the folding connection rod maintains an unfolding state under the locking of a spring and a lock catch. When the operator is in a switch-on state, a moving contact and a static contact are closed, and a load current passes through the magnetic coil. When overcurrent or short circuit current appears, the electromagnetic coil generates electromagnetic force, a movable iron core in the oil damper attracts the armature to move, one end of the armature strikes a protruded pin on the lock catch, the lock catch rotates to relieve the locking state of the folding connection rod, the folding connection rod is folded to drive the crank and the moving contact arm to rotate respectively, and when the operator rotates to a switch-off position, the moving contact is separated from the static contact. The invention utilizes the movable iron core in the oil damper to generate larger electromagnetic force, thereby attracting the armature and triggering a mechanical tripping mechanism to act, and the tripping process is not affected by ambient temperature and the improved hydraulic electromagnetic breaker has high reliability.

Description

Technical field: [0001] The invention relates to the electrical field, in particular to a circuit breaker, in particular to an improved hydraulic electromagnetic circuit breaker. Background technique: [0002] In the prior art, a thermal-magnetic circuit breaker is provided with a bimetal connected in series with the circuit. When overloaded, the heat generated by the current deforms the bimetal, thereby tripping the circuit breaker. In addition, an electromagnetic coil that can communicate with the load current and voltage is provided. The electromagnetic coil is wound around a coil skeleton, and there is a movable iron core in the skeleton, and the iron core can move under the action of the magnetic field generated around the coil. Devices that utilize heat and deformation of bimetallic strips will be affected by changes in ambient temperature. Working in a cold environment requires a large current to trip, which endangers safety; while working in a hot environment, they ...

AI Technical Summary

Problems solved by technology

Working in a cold environment requires a large current to trip, which endangers safety; while working in a hot environment, they will trip at a small current, causing unnecessary disconnection of the line;

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