Positive pressure air breathing apparatus for emergency rescue

Abstract

The invention discloses a positive pressure air respirator for emergency rescue. The air respirator can be connected with an internal air source and an external air source; an air storage cylinder serves as the internal air source; a pressure reducer is arranged at an air outlet of the air storage cylinder and is provided with a high-pressure side port and a medium-pressure side port; the medium-pressure side port is communicated with an air source switching device; the external air source for the air respirator is also communicated with the air source switching device; the air source switching device is communicated with an air supply valve by an air guide tube, and only switches on one air source once; and automatic switching and adjustment of the air source switching device can be achieved through pressure comparison of the external air source and the internal air source. According to the air respirator, the external air source can be fully used before a rescuer enters a rescue site, so that the internal air source is saved, and the effective service time of the air respirator is prolonged; and the external air source can be used without limitation in an allowable working place, so that the rescue quality is improved, and the rescue risk is reduced.

Description

technical field [0001] The invention relates to a positive pressure air respirator for emergency rescue, in particular to an air respirator which can be connected to an external air source. Background technique [0002] Positive pressure air respirator is a kind of isolated respirator that uses compressed air as the breathing air source. The compressed air used is stored in the self-contained gas storage bottle. When breathing with a respirator, the entire respiratory system is always isolated from the outside world and the internal pressure is higher than the pressure of the external environment. During the breathing process, toxic and harmful gases from the outside cannot enter the respiratory system, ensuring safe and reliable respiratory protection. The equipment has been widely used in many fields such as fire protection, chemical defense, anti-terrorism, emergency response, and emergency rescue. [0003] With the rapid development of my country's economy and the frequ...

AI Technical Summary

Problems solved by technology

However, in the actual use process, after the gas storage cylinder is filled with compressed gas, a certain amount of gas will be wasted during the dressing and inspection process when wearing it, and according to national standards, when the residual pressure in the gas storage cylinder reaches 5-6MPa, personnel should evacuate from the disaster area If it cannot continue to be used, the actual effective use pressure of the gas cylinder is only about 22MPa. In addition, due to factors such as tension, fear, and large amount of work during the rescue process, the human breathing volume will be increased sharply, thereby greatly reducing the breathing capacity of the respirator. Effective use of time, it is not uncommon for many professional rescuers to suffocate and die due to insufficient air volume during the rescue process

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