Gas return and sound eliminating master gas control valve for dental unit gas foot switch

Abstract

The invention provides a gas return and sound eliminating master gas control valve for a dental unit gas foot switch and relates to the technical field of gas valves. The gas return and sound eliminating master gas control valve comprises a gas valve body, a pedal, a main gas cavity, a gas outlet cavity, a gas inlet cavity and a waste gas cavity. The main gas cavity is formed at the upper middle portion of the inner side of the gas valve body from top to bottom, the gas outlet cavity and the gas inlet cavity are formed in the centers of the left side and the right side of the gas valve body correspondingly and communicate with the main gas cavity, and the waste gas cavity is formed in the lower portion of the inner wall of the gas outlet cavity and communicates with the inner wall of the gas outlet cavity. The pedal comprises a main spring perpendicularly embedded in the inner side of the main gas cavity, a compression spring and a connecting rod integrated with the lower end of the main spring are welded to the lower end of the main spring through lasers, the connecting rod is located between the compression spring and the main spring, a soft pad is attached to the bottom of the compression spring, and the lower surface of the soft pad is attached to the bottom of the connecting position of the gas inlet cavity and the gas outlet cavity. The gas return and sound eliminating master gas control valve has the beneficial effects that the sealing performance of the gas valve is improved, and a silencer is conveniently replaced.

Description

technical field [0001] The invention relates to the technical field of air valves, in particular to a main control air valve for air return and noise reduction of an air foot switch of a dental treatment machine. Background technique [0002] The gas valve is the part of the compressor that controls the flow of gas into and out of the cylinder. It is mainly composed of valve seat, valve plate, spring and lift limiter. The lift height or closure between the valve plate and the valve seat determines the size and airtightness of the gas passage. The spring is mainly used to push the valve plate to close, and can also reduce the impact with the lift limiter when the valve plate is opened. [0003] The air return and noise reduction main control air valve of the air foot switch of the existing dental treatment machine, when not in use, the sealing performance between the three air cavities in the air valve is not tight enough, which leads to the phenomenon of easy air leakage. ...

AI Technical Summary

Problems solved by technology

[0003] The air return and noise reduction main control air valve of the air foot switch of the existing dental treatment machine, when not in use, the sealing performance between the three air cavities in the air valve is not tight enough, which leads to the phenomenon of easy air leakage. Affect the working effect of the main air valve, and the conventional air valve, under long-term use, the internal muffler is prone to wear and tear, and it is troublesome and inconvenient to replace

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