Double-breaking-point movable contact system with closed compensation function

Abstract

The invention provides a double-breaking-point movable contact system with the closed compensation function. The system comprises a contact pedestal (1) and a movable contact board (2). The system is characterized in that, the movable contact board (2) is arranged on the contact pedestal (1) through a left torsional spring (3) and a right torsional spring (4). The left torsional spring (3) and the right torsional spring (4) are respectively arranged on erection columns (101, 101') on the two sides of the contact pedestal (1). One end of the left torsional spring (3) keeps down onto the left contact pin (201) of the movable contact board (2), and the other end of the left torsional spring (3) presses against a left branch groove (102) on the contact pedestal (1). One end of the right torsional spring (4) keeps down onto the right contact pin (202) of the movable contact board (2), and the other end of the right torsional spring (4) presses against a right branch groove (103) on the contact pedestal (1). When a difference exists between upper and lower static contacts to cause the upper and lower static contacts to be not in the same contact surface, a movable contact firstly gets in contact with a contact surface that is closer to the movable contact in stroke so as to generate a contact pressure. At this time, the counter-force applied onto the movable contact is larger than the torsion force of a movable contact spring or the initial pressure of the movable contact, so that the movable contact is driven to swing. Therefore, the differential compensation effect is realized and the reliable contact of contacts is ensured. The breaking reliability of circuit breakers is improved.

Description

technical field [0001] The invention belongs to the technical field of components of a circuit breaker, and specifically relates to a double-break point moving contact system with a closing compensation function, which improves the stability and reliability of the action of the double-break point contact system. Background technique [0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breaker, also known as automatic switch, commonly known as "air switch", also refers to low-voltage circuit breaker. It is an electrical appliance that not only has the function of manual switch, but also can automatically protect against voltage loss, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and can automatically cut off the circuit when they have severe overload, s...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a technical defect of the existing double-break point contact system, which has the technical defect that the contacts are burned after the electrical life test and breaking the large short-circuit current, and the inability to act synchronously reduces the breaking reliability of the product. In the double-break point contact system with compensation function, when there is a difference between the upper and lower static contacts and they are not on the same contact surface, the moving contact will first contact the contact surface with a similar stroke to generate contact pressure. The reaction force generated by the head is greater than the torsion force of the spring of the moving contact or the initial pressure of the moving contact, and the moving contact swings, thereby playing the role of differential compensation, ensuring reliable contact of the contacts, and improving the reliability of the breaking of the circuit breaker

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