a load switch

Abstract

The invention discloses a load switch. The load switch comprises a chamber, a three-phase switch and a frame; the chamber is formed by an insulating housing; the insulating housing comprises a top plate, a bottom plate and a supporting plate; insulating air is charged in the chamber; the three-phase switch is arranged in the chamber, comprising an upper static contact, a dynamic contact, a lower static contact, a ground contact and a blade; the upper static contact is fixed to the upper end of the chamber; the lower static contact is mounted at the lower end of the chamber; the ground contact is arranged on the side surface of the chamber; the lower end of the dynamic contact is connected to the upper end of the lower static contact; the blade is fixed on the dynamic contact; an air blowing opening is formed in the blade; the upper edge and the side edge of the blade are respectively wrapped with silica gel layers; the silica gel layer at the upper edge of the blade is closely clung to the top plate of the insulating housing; the silica gel layer at the side edge of the blade is closely clung to a supporting plate of the insulating housing; the frame is arranged on the side surface of the chamber; a driving mechanism connected with the dynamic contact is arranged in the frame. According to the load switch, the arc extinction air pressure is improved to avoid the wearing of the blade and the chamber, and therefore, the arc extinction performance can be improved.

Description

technical field [0001] The invention relates to a load switch. Background technique [0002] The load switch is a switching device between the circuit breaker and the isolating switch. It has a simple arc extinguishing device, which can cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current. [0003] The load switch mainly has two parts: an insulating case and a three-phase switch. A three-phase switch is arranged in the insulating shell, and the three-phase switch generally includes an upper static contact, a lower static contact, a moving contact, a grounding contact and blades. The upper static contact is installed on the upper end of the insulating housing, the lower static contact is installed on the lower end of the insulating housing, and the grounding contact is arranged on the side of the insulating housing. The lower end of the moving contact is pivotally connected to the upper end of the lower static contact t...

AI Technical Summary

Problems solved by technology

[0004] 1. If the gap is too large, the air pressure blown to the lower end of the upward static contact by the tuyere will be insufficient, the arc extinguishing ability will be limited, and the arc extinguishing will fail easily;

[0005] 2. If the gap is too small, it will be difficult to process the parts, difficult to assemble, and the requirements for the cooperation between the blade and the chamber are high, and the cost of the load switch is high;

[0006] In addition, if the gap between the blade and the chamber is removed, that is, the blade is in contact with the inner wall of the chamber, friction will occur between the blade and the chamber, resulting in wear of the blade and the chamber, and the power required to drive the moving contact and the rotation of the blade Increase

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