Explosion-proof type magnetic valve for mine

Abstract

The invention discloses an explosion-proof type magnetic valve for a mine, belonging to the field of magnetic valve and comprising an explosion-proof shell and the like, wherein the upper end and the lower end of the explosion-proof shell are connected with a pressure pad and an explosion-proof cover, the inner cavity of the explosion-proof shell is provided with a non-magnetic tube which passes through a solenoid coil, the lower part of the non-magnetic tube is provided with a movable iron core, the non-magnetic tube and the movable iron core pass through the explosion-proof cover of which the lower end is provided with a valve body, the left end and the right end of the valve body are respectively provided with a water inlet and a water outlet, a piston is arranged between the water inlet and the water outlet of the valve body, and a compression spring is arranged between the upper part of the inner cavity of the valve body and the piston. The invention utilizes the air pressure difference generated by the upper surface and the lower surface of the piston to push the piston to alleviate opening and closing movement; because of being made of stainless material, the piston bears large water pressure; because the inner cavity of the lower valve body limits the piston, the piston has favorable centring property and accurate closing and opening position; and because a sealed pad is arranged between the piston and the inner cavity of the lower valve body, the piston does not directly rub with the inner cavity of the lower valve body, thereby prolonging the service life of the magnetic valve.

Description

technical field [0001] The invention relates to a solenoid valve, in particular to a mine explosion-proof solenoid valve. Background technique [0002] There are often mineral dust and coal dust flying in the mine, which is very harmful to the health of the workers. In order to eliminate these dust, the workers introduce water from the ground to the underground, spray water through the injector, and set up a switch to control the water flow. Solenoid valve, due to the presence of explosive mixtures such as gas in the mine, once the parts in the solenoid valve generate sparks and arcs, these explosive mixtures will be detonated, forming a local or even a gas explosion accident in the entire mine, detonating electrical equipment, and generating huge The explosive force of the explosion makes the explosion and splashing of the shell where the parts are located unimaginable. Therefore, the solenoid valve used in the mine must be explosion-proof, that is, the explosion-proof sole...

AI Technical Summary

Problems solved by technology

[0004] The valve plug of this kind of solenoid valve bears little water pressure, and the valve is easily damaged once it is subjected to a large impact force, and the needle rod is easy to eccentric during use, the centering of the valve plug is not good, and the valve of the solenoid valve is easy to close tightly. and its short service life

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