Air suction valve and mask both with function of switching between ambient air and air in air bottle

Abstract

The invention discloses an air suction valve with a function of switching between ambient air and air in an air bottle. The air suction valve comprises an air suction valve seat, an air suction valve cover, a valve rod, an air suction valve plate and a spring, wherein air holes and an axially extending guide hole are formed in the air suction valve seat; the air suction valve seat is covered by the air suction valve cover; air holes are also formed in the air suction valve cover; the valve rod is correspondingly arranged in the guide hole, and can move in an axial direction along the guide hole; an air passage is formed in the air suction valve plate; the air suction valve plate is fixedly connected with the valve rod to move between an opening station and a closing station along with the axial movement of the valve rod; the spring is arranged between the air suction valve plate and the air suction valve cover to press the air suction valve plate at the closing station. The invention also discloses a mask with the function of switching between the ambient air and the air in the air bottle. According to the air suction valve and the mask, switching between the ambient air and an air source in the air bottle can be performed, the air in the air bottle is effectively utilized, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to a breathing mask, in particular to a breathing mask with an air source switching function. Background technique [0002] Since its birth in the 1970s, air respirators have experienced nearly 40 years of continuous improvement and development. etc., so that firefighters or ambulance personnel can safely carry out fire extinguishing, emergency rescue and rescue work in harsh environments full of dense smoke, poisonous gas, steam or lack of oxygen. General air respirators are equipped with a full-face mask with wide field of vision, bright and good airtightness, and the air supply device is equipped with a new type of air supply valve with small size, light weight and stable performance; high-strength backboard and high safety factor are selected High-quality high-pressure gas cylinders; the decompression valve device is equipped with a residual gas alarm, within the specified pressure range of the gas cylinder, it can send an au...

AI Technical Summary

Problems solved by technology

Although in recent years, technical improvements in related fields at home and abroad have enabled the air respirator to have the above functions, but the short use time is always the biggest shortcoming of the air respirator, and it is also one of the problems that users in this field hope to be able to solve. one

[0003] As we all know, by increasing the rated pressure of the gas cylinder or the gas storage volume of the gas cylinder, the service time of the air respirator can be extended. will add additional manufacturing costs

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