Electric knife switch with good sealing performances

Abstract

The invention discloses an electric knife switch with good sealing performances, and the knife switch comprises a connecting piece, a hinge, a bottom housing, a sliding block, a sealing groove, a protection housing, a sliding rail, a clamping head, an insulating handle, a locking piece, an insulating block, a locking bolt, a fixed piece, an anti-release block, a connecting knife blade, a top housing, a fixed plate, a support plate, a clamping block, a rotating shaft, a first connecting column, a fuse, a second connecting column, and a clamping groove. According to the invention, the edge of one surface of the fixed plate is provided with the sealing groove, and one side of the fixed plate is provided with the protection housing, wherein the bottom of the protection housing is fixedly connected with the insulating block. The insulating block at the bottom of the protection housing can be attached in the inner cavity of the sealing groove through the locking bolt. The connection of the insulating block and the sealing groove effectively prevents the external air from making contact with a power-on part in the knife switch, thereby preventing dust and moisture in the air from affecting the normal connection operation of the knife switch.

Description

technical field [0001] The invention relates to a knife switch, in particular to a power knife switch with good airtightness, belonging to the technical field of power switches. Background technique [0002] The knife switch, also known as the knife switch and the knife switch, is generally used for AC and DC low-voltage (not greater than 500V) circuits that do not need to be cut off and closed frequently. The operating current cannot exceed the rated value under the rated voltage. On the machine tool, the knife The switch is mainly used as a power switch. It is generally not used to turn on or cut off the working current of the motor. The knife switch is divided into unipolar, bipolar and three-pole. The commonly used three-pole knife switch has a long-term allowable current of 100A, 200A, 400A, and 600A. And 1000A five kinds. [0003] Due to the relatively simple structure of the existing knife switch, the shell will open a through groove to ensure the movement of the kni...

AI Technical Summary

Problems solved by technology

[0003] Due to the relatively simple structure of the existing knife switch, the shell will open a through groove to ensure the movement of the knife, resulting in poor sealing of the switch, resulting in the fuse and other connecting columns in the inner cavity of the knife switch being easily damaged by dust, Moisture and other sundries in different environments enter, resulting in poor contact and short circuit of the knife switch, and because the insulating handle of the knife switch is mostly made of ceramic material, the quality is relatively high, and the gap between the clamping blocks becomes larger due to long-term use, resulting in The knife switch is easy to slip off, causing the switch to turn on, causing some inconvenience

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