Chemical protecting, poison filtering and ventilation switching valve

Abstract

The invention discloses a chemical protecting, poison filtering and ventilation switching valve. A valve plate (17) in the valve is fixedly connected with a valve plate shaft (18), the left side and the right side of the valve plate shaft (18) penetrate through a shell A (4) and a shell B (6) respectively, and the left side of the valve plate shaft (18) is movably connected with a clutch A (22); the clutch B (23) is fixed to a shaft of the motor (26), and the two clutches are meshed; a PCB (2), a shifting fork (21), a motor (26) and an electromagnet (push type) (25) are fixed to the left side of the shell A (4); the right side of the valve plate shaft (18) is fixedly connected with a valve plate handle (15); a middle hole of a limiting pin (9) is movably connected with a fixed shaft (29); the upper end of an electromagnet connecting rod (8) is movably connected with the upper end of the limiting pin (9); and the lower end of the electromagnet connecting rod (8) is movably connected with a push rod of an electromagnet (pull type) (10). The switching valve manufactured by the method has the advantages of being small in size, fast to switch, capable of achieving communication linkage, stable in performance and the like.

Description

technical field [0001] The invention belongs to the field of valves, and in particular relates to a switching valve for anti-chemical and poisonous ventilation. Background technique [0002] The anti-chemical and poisonous ventilation switching valve is a special device used to realize the switching function of poisonous ventilation and clean ventilation of the anti-chemical three-proof system; the poisonous ventilation switching valve is installed in the poisonous ventilation system and is usually in a clean and ventilating state. When an alarm signal is issued, the poison filter ventilation switch valve needs to be switched to the poison filter ventilation state; in order to ensure the safety of ventilation and avoid the damage of pollutants, the poison filter ventilation switch valve has high requirements on switching time and air tightness. Usually the switching time is not more than 150 milliseconds, and the leakage is not more than 0.5‰ of the rated air volume. At pre...

AI Technical Summary

Problems solved by technology

At present, most of the poison ventilation switching valves are manual switching valves. When the operator receives the alarm information, he usually switches the switching valve from the cleaning ventilation mode to the poison ventilation mode manually; usually the switching time is long, and fast linkage cannot be achieved. Affect the protective effect of the poison ventilation system

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