Positive pressure type air respirator for fire fighting

Abstract

The invention relates to the field of fire fighting breathing equipment, and discloses a positive pressure type air respirator for fire fighting. The positive pressure type air respirator comprises apressure reducer body, wherein a high-pressure chamber, a ventilation groove and a low-pressure chamber are formed in the pressure reducer body, the high-pressure chamber and the low-pressure chamberare communicated through the ventilation groove, and a guide-in groove communicated with the high-pressure chamber is formed in the pressure reducer body. According to the positive pressure type air respirator for fire fighting, through the structural design of a positioning cylinder pipe and an elastic rubber film in the low-pressure chamber, the positioning cylinder pipe communicates with a pressure adjusting pipe on one side of the high-pressure chamber, when the oxygen pressure intensity of an oxygen bottle in the vertical high-pressure chamber is not stable, high-pressure oxygen flows into the positioning cylinder pipe, the elastic rubber film is bounced downwards, a valve rod and a valve element are driven to move downwards, the pressure intensity in the low-pressure chamber is reduced, the balance state is recovered, and therefore the problem that when oxygen in the high-pressure chamber is increased, exhausting and pressure relief are carried out, and oxygen waste is caused issolved, and the service life of the air respirator is prolonged.

Description

technical field [0001] The invention relates to the field of fire-fighting breathing equipment, in particular to a positive-pressure air breathing apparatus for fire-fighting. Background technique [0002] Positive pressure air breathing apparatus is a self-contained open fire-fighting air breathing apparatus commonly used in the field of firefighting. For fire extinguishing, emergency rescue and rescue work, the positive pressure air respirator is mainly composed of a breathing mask and an oxygen cylinder. The oxygen in the oxygen cylinder is in a high-pressure state, so a pressure reducer is needed to decompress the high-pressure oxygen in the oxygen cylinder. , and then delivered to the breathing mask so that firefighters can breathe normally. [0003] However, in the existing positive pressure air respirator, when the pressure reducer is in use, when the oxygen supply pressure of the oxygen cylinder changes, that is, the pressure in the high pressure chamber in the pres...

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Problems solved by technology

[0004] The invention provides a positive pressure air respirator for firefighting, which has the advantages of being convenient for firefighters to use for a long time and does not affect the use experience, and solves the technical problems mentioned in the background technology

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