Air supply valve for air respirator

Abstract

The invention discloses an air supply valve for an air respirator, which comprises an air supply valve body, and the air supply valve body includes an air supply valve shell, a medium pressure air joint, a positive pressure mechanism and an air supply cavity; One side of the housing of the gas valve is provided with a bypass flow regulating device on the other side of the housing of the gas supply valve. The bypass flow regulating device includes a tubular structure housing, a piston shaft, a knob and a button; the bypass flow regulating The front end of the device extends into the positive pressure mechanism and communicates with the air intake channel of the positive pressure mechanism. There is a vent hole on the positive pressure mechanism, and the bypass flow regulating device communicates with the air supply chamber through the vent hole. The invention has lower air resistance, can ensure sufficient air volume during use, and can conveniently remove fog and sweat inside the face screen of the mask, thereby improving comfort during wearing.

Description

technical field [0001] The invention relates to the technical field of respirators, in particular to a positive pressure air respirator air supply valve for fire fighting and emergency rescue. Background technique [0002] Positive pressure air respirator (referred to as air respirator) is a device used to help users ensure breathing safety in dangerous environments (such as hypoxia, toxic gases, smog, fire rescue, etc.). The working principle of the air respirator is that the compressed air in the gas cylinder is decompressed twice through the pressure reducing valve and the air supply valve, and then decompressed to a gas suitable for human breathing and sent to the mask for breathing. The positive pressure is always maintained in the mask to ensure the use The patient will not be inhaled toxic and harmful gases. [0003] In the existing air supply valve technology, the positive pressure mechanism in the air supply valve supplies air quantitatively according to the breath...

AI Technical Summary

Problems solved by technology

[0004] When people are in rescue activities such as rescue and fire fighting, when the body is vigorously exercising, the breath will be short of breath, and the breathing volume will double. Strenuous exercise will also generate a lot of heat, and it will be radiated by the fire source, so the temperature inside the mask will rise and the comfort of the human body will decrease

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