Longitudinal magnetic contact structure of vacuum arc-extinguishing chamber

Abstract

The invention discloses a longitudinal magnetic contact structure of a vacuum arc-extinguishing chamber, which comprises a contact cup (1), wherein the open end of the contact cup (1) is connected with a contact piece (2); the cup wall of the contact cup (1) is provided with skewed slots (3) distributed in the circumferential direction, the skewed slots (3) penetrate through the open end to form notches (4) on the end surface of the open end, the notches (4) are tangent to the inner cup wall (5) of the contact cup (1), and a part cut between two adjacent skewed slots (3) on the cup wall of thecontact cup (1) forms a coil (8); the edge of the contact piece (2) is provided with longitudinal magnetic slots (6) distributed in the circumferential direction, the longitudinal magnetic slots (6)can be axially aligned with the notches (4), and one ends of the longitudinal magnetic slots (6) penetrate through the edge of the contact piece (2). The longitudinal magnetic contact structure can achieve the purpose of low resistance under the condition of keeping the short-circuit current breaking capacity unchanged, and facilitates the miniaturization design at the same time.

Description

technical field [0001] The invention relates to the technical field of vacuum interrupters, in particular to a longitudinal magnetic contact structure of a vacuum interrupter. Background technique [0002] The vacuum interrupter is the core device of the vacuum switch, which is responsible for controlling the arc current. The cutting and closing of the circuit are completed by the opening and closing movement of a pair of contacts with a magnetic field in the vacuum interrupter. In the existing small vacuum interrupter, with the open end of the contact cup as the upper part, the contact cup coil of the cup-shaped longitudinal magnetic contact structure used for arc control includes a contact cup, and the contact cup wall is set There is a chute, and the chute rotates along the circumference of the contact cup toward the opening end of the contact cup and runs through the opening end. This structure has a disadvantage in use: in order to increase the current flow path, incre...

AI Technical Summary

Problems solved by technology

This structure has a disadvantage in use: in order to increase the current flow path, increase the longitudinal magnetic field strength, and enhance the breaking capacity of the short-circuit current of the vacuum interrupter, it is often necessary to increase the rotation angle of the chute α (current α Usually between 90~103°), but with α The larger the chute, the deeper the cutting of the chute to the wall of the contact cup (that is, the longer the chute), and the corresponding coil resistance will increase, especially the resistance value of the coil root will be large due to the small cross-sectional area

In order to overcome this problem, the only way to increase the contact cup coil is to increase the overall diameter of the vacuum interrupter, which is not conducive to the miniaturization design of the device

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