Pressure relief valve of self-rescuer

Abstract

The invention a pressure relief valve of a self-rescuer, which includes a valve body, wherein a pressure relief seat, an O-shaped ring, a pressure reduction spring and a piston are arranged in the valve body, and the pressure relief seat is arranged at a gas inlet end of the valve body; an exhaust port is arranged at the gas inlet end on the valve body; the O-shaped ring is arranged at the exhaust port and is compacted through the pressure relief seat; the pressure reduction spring is mounted on the piston in a sleeving manner and is connected with the pressure relief seat; and when the output gas pressure achieves a set value, the pressure relief seat moves to the pressure reduction spring side and loosens the O-shaped ring. According the invention, a safety device is post-positioned, so that in case of overpressure gas relief, the exhausted gas can be discharged directly into the atmosphere, but not a breath used loop, and the pressure relief valve is safe and reliable and ensures that the human body breath is not influenced.

Description

technical field [0001] The invention relates to a decompression device. Specifically, it is a self-rescuer decompression safety valve used for compressed oxygen in coal mines. Background technique [0002] When the existing coal mine compressed oxygen self-rescuer decompresses the output, in order to prevent the output pressure from exceeding the pressure that the human body can bear, an overpressure safety exhaust valve is specially arranged. However, the structure of the existing product determines that the gas discharged by the safety valve is still released in the breathing pipeline, which cannot achieve the safe exhaust effect and affects normal use. [0003] The structure of the existing self-rescuer decompression safety valve is as follows: figure 1 , including valve body 11, SHAPE \* MERGEFORMAT Inlet A, high-pressure gas forms a stable low-pressure output B through the action of piston 12 and spring 13, and enters airbag 14 for human breathing, but the output low...

AI Technical Summary

Problems solved by technology

However, the structure of the existing product determines that the safety valve still releases the exhausted gas in the breathing pipeline, which cannot achieve a safe exhaust effect and affects normal use.

[0003]The structure of the existing self-rescuer decompression safety valve is Figure 1, including valve body 11, SHAPE \* MERGEFORMAT Inlet A high-pressure gas forms a stable low-pressure output B through the action of piston 12 and spring 13, and enters air bag 14 for supply It is used for human breathing, but it will also increase the output low pressure due to other accidents

In order to prevent the damage to the human respiratory tract after the low pressure increases, a safety valve exhaust port 15 is specially added to the device. However, when the output low pressure exceeds 0.8mpa, the exhaust of the safety valve is discharged into the air bag, that is to say, when entering breathing The gas is still under high pressure, and the actual effect is not achieved

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