Positive pressure type air respirator

Abstract

The invention discloses a positive pressure type air respirator. The positive pressure type air respirator comprises a backboard assembly and an air bottle assembly fixed on the backboard assembly. The air bottle assembly is leaded to a respirator air supply valve through a pressure reducing valve and a face mask air supply hose. An air-guide pipe sliding seat is fixedly installed on the respirator air supply valve. An air-guide pipe is slidably installed on the air-guide pipe sliding seat. The inner end of the air-guide pipe is connected with the outer end of an air supply pull rod. The inner end of the air supply pull rod is movably connected on a locking hook. An air supply pullback spring is installed between the locking hook and an air supply valve body. A locking board is fixedly installed on the air supply valve body. A locking hole is arranged on the locking board. The hook part of the locking hook corresponds to the position of the locking hole. The air supply valve body is hinged to an air supply lever. The other end of the air supply lever opposite to the hinged end is connected on a membrane. The air supply lever contacts with and is connected with the outer end of the air supply pull rod. The positive pressure type air respirator is sensitive in movement, low in respiratory resistance, and good in sealing property, and is suitable for all kinds of positive pressure type air respirator.

Description

technical field [0001] The invention relates to a personal protective air respirator for fire-fighting and lifesaving, in particular to an air respirator for survivors in emergency situations such as fire, dust and poisonous gas. Background technique [0002] Positive pressure air breathing apparatus is a kind of air breathing apparatus used by firefighters and rescue personnel to prevent inhalation of harmful smoke, poisonous gas, harmful substances suspended in the air or hypoxic environment when fire fighting and rescue. device. The positive pressure air respirator can effectively prevent harmful and toxic gases from outside the mask from invading into the mask, and has high safety and reliable protection performance. It mainly includes compressed air bottles, bottle head pressure reducing valves, backboards and comprehensive The full-face mask is equipped with an air supply valve that supplies breathing air into the mask, and the air supply valve will open or close with...

AI Technical Summary

Problems solved by technology

Chinese invention patent 89210025.7 discloses a "positive pressure mechanism of a positive pressure respirator", which is mainly composed of a diaphragm, a liner, a rocker, an air intake valve and a pressure spring. Drive the diaphragm and the lever to move down together, and then push the rocker to open the intake valve when the diaphragm moves down, and the supply valve will input air into the mask. This structure needs to use the suction negative pressure to push the diaphragm, Lever and rocker are used to open the intake valve block and supply air to the cover. There are many interlocking mechanisms, low sensitivity, and special training is required; especially the air supply is through the deflection of the rocker to make the air supply valve block produce an inclined gap. supplied, the seal is not tight, and it is easy to leak, which not only wastes the fresh air source, but also may cause the infiltration of harmful gases

In the above structure, the opening or closing of the air supply valve depends on the position of the rocker. When the respirator is not in use, the rocker may become unstable with the movement of the mask or the position of the placement, which will still cause the air intake valve to not be tightly sealed. resulting in a leak

Chinese invention patent 200920126137.6 also discloses a "positive pressure air respirator air supply valve", which also includes a diaphragm, a piston, a piston body, a return spring and a transmission mechanism. When in use, the diaphragm acts on one end of the piston through the transmission mechanism. The other end of the piston is connected to the valve head, which controls the opening or closing of the valve port. Although this structure has good sealing performance and is relatively compact, the transmission mechanism for controlling the valve head is complicated, and the transmission resistance and the closing and opening of the valve head The thrust is large; therefore, the breathing resistance is relatively large, and the adaptability to the crowd is limited, thereby affecting its practicability; at the same time, in the non-use state, there is also a lack of effective locking of the valve head, which is easy to cause leakage at the valve port

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