breaker

Abstract

The invention relates to a breaker which comprises an arc extinguish chamber and a hydraulic operation mechanism, wherein the hydraulic operation mechanism is provided with a pump, the pump comprises a pump body which has a cylindrical hole cavity, a rotor whose rotation axis extends in the front and back direction is arranged in the pump body, the section of the rotor is in a polygon structure, a convex edge which is tangent with the cylindrical hole is formed between two adjacent edges, a liquid inlet and a liquid outlet which are separated by a separation board are formed in the pump body, and one end of the separation board is in sliding pushing fit with the peripheral surface of the rotor; the breaker is characterized in that oil guide channels which are communicated with the peripheral two sides of the convex edges are arranged in the positions of the convex edges, blocking blocks are assembled on the rotor in the radial direction of the rotor in a guide moving manner, the blocking blocks avoid the first positions of the oil guide channels in the moving stroke and move downward under the action of the centrifugal force so as to block the second positions of the oil guide channels, and springs which apply acting force to the blocking blocks so as to force the blocking blocks to be located in the first positions are arranged on the rotor. According to the provided breaker, the motor starting load can be reduced.

Description

technical field [0001] The invention relates to a circuit breaker. Background technique [0002] As a common electrical equipment, the circuit breaker is widely used. The circuit breaker includes an arc extinguishing chamber, moving contacts and static contacts arranged in the arc extinguishing chamber. The circuit breaker also includes a transmission connection with the moving contact to drive the moving contact. The hydraulic operating mechanism that realizes the opening and closing of the moving contact and the static contact by the action of the contact. The hydraulic operating mechanism includes a power part and an execution part. The power part of the hydraulic operating mechanism includes a motor and a pump. The execution of the hydraulic operating mechanism The part includes a hydraulic cylinder and an energy storage spring. The power part can pump oil into the hydraulic cylinder. The hydraulic cylinder compresses the energy storage spring to store energy. When it ne...

AI Technical Summary

Problems solved by technology

The existing problem of this kind of pump is: the rotor is driven by the motor to rotate, corresponding to the motor, the start-up load is large, not only the power consumption but also the loss of the motor is large, and in the prior art, when the motor is started, the low pressure cavity The motor is already filled with hydraulic oil, and the start of the motor can only be completed by working on the hydraulic oil, which increases the starting load of the motor, which not only leads to an increase in the minimum power when the motor is selected, but also affects the normal energy consumption of the motor

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