CN2045310U

CN2045310U - Postive pressure type mechanism for positive pressure breathing apparatus

Info

Publication number: CN2045310U
Application number: CN 89210025
Authority: CN
Inventors: 李庆余; 丁万荣; 崔连富; 薄守文
Original assignee: FUSHUN COAL MINE SAFE INSTRUMENT FACTORY
Current assignee: FUSHUN COAL MINE SAFE INSTRUMENT FACTORY
Priority date: 1989-01-14
Filing date: 1989-01-14
Publication date: 1989-10-04

Abstract

The utility model discloses a positive pressure type mechanism for a positive pressure breathing apparatus, which is composed of a mask, an air supply valve, an exhalation valve and a conduit pipe. A tension spring, a connecting rod, a lever and a lever fulcrum are adopted in the air supply valve. One end of the lever is connected with the tension spring, and the gap on the other end is sheathed with the connecting rod. In the course of working, the connecting rod moves up and down following a diaphragm, and the gap of the lever slides up and down along the connecting rod. The exhalation valve comprises a valve sheet, a valve rod, a lining chip, an adjusting base, an adjusting screw and a regulating spring. The positive pressure type mechanism for the positive pressure breathing apparatus has the advantages of simple structure, convenient installation and safe operation.

Description

Postive pressure type mechanism for positive pressure breathing apparatus

The positive-pressure type mechanism of the utility model positive pressure respirator is meant the positive-pressure type mechanism that sets up in the negative pressure air respirator, be the improvement to the negative pressure air respirator, and this respirator can directly provide fresh air to the wearer.

The personnel that work in adverse circumstances for preventing the pernicious gas infringement, must wear air respiratorresuscitator.What generally use at present is the negative-pressure type air respiratorresuscitator.This respirator is not owing to there is positive-pressure type mechanism, in use, air pressure in the face shield along with exhale and inspiratory cycle change, negative pressure appears by phased manner, if the seal of face shield is bad or wear incorrect, when being in negative pressure in the face shield, the pernicious gas of outside just enters in the face shield easily, works the mischief to the wearer.

The purpose of this utility model is the positive-pressure type mechanism of a kind of positive pressure type air respiratorresuscitator rational in infrastructure, esy to use, safe and reliable of development.

By face shield be contained in supply valve on the face shield and positive-pressure type mechanism that outlet valve is formed, supply valve one end leads in the face shield, and the other end links to each other with the gas transmission conduit.

Supply valve is made up of the diaphragm in upper and lower casing and the housing, liner plate, rocking bar, intake valve, compression spring, be characterized in the upper casing of supply valve extension spring, connecting rod, lever and balance pivot being installed, connecting rod passes diaphragm and is fixed on the liner plate below the diaphragm, lever and balance pivot are for flexibly connecting, lever one end and extension spring link, the breach of the other end is enclosed within on the connecting rod, and connecting rod moves with diaphragm is upper and lower in the course of the work, and the breach of lever is along the upper and lower slip of connecting rod.Rocking bar, intake valve and compression spring all are contained in the valve sleeve, and valve sleeve is contained in the lower cover of lower house.

Outlet valve is made up of valve block, valve rod, liner, valve seat, adjustment seat, adjustment screw and regulating spring, after valve block, valve rod and the liner assembling, be installed on the valve seat again, valve rod pass valve seat circular hole can upper and lowerly slide, promote valve block, liner is upper and lower moves, the regulating spring two ends are enclosed within the upper end of adjusting screw lower end and valve rod respectively, adjust seat and are used for fixing the adjustment screw, the opening force of the pressure decision valve block of regulating spring, valve seat is fixed on the joint seat of face shield.

" the positive-pressure type mechanism " of the utility model positive pressure respirator, make the barrier propterty of respirator good, because the suffered pressure of diaphragm face in upper shell is greater than atmospheric pressure, because not only be subjected to the pressure of atmosphere, and be subjected to the pressure of lever, promptly under condition greater than atmospheric pressure, diaphragm just moves downward, and promote rocking bar and open air intake valve, thereby the lower house that guarantees supply valve is imported gas in the course of the work in face shield, make and be malleation in the face shield, gas in the environment can not be entered in the face shield, guarantee wearer's safety, the rocking bar of supply valve, intake valve, compression spring is all in valve sleeve, valve sleeve refills in the lower cover of lower house into, this structure is convenient to Installation and Debugging, also reduces the requirement of strength to lower cover, and the utility model is simple in structure, easy to install, safe and reliable.

Lift an example now its operation principle be described:

Produce several positive pressure respirators by technique scheme, the high 260mm of face shield, the long 15mm of connecting rod, the long 50mm of lever, supply valve diameter 105mm, high 85mm, the high 60mm of outlet valve, wide 50mm are good through wearing protective value on probation.

Below in conjunction with Fig. 2, Fig. 3 operation principle is described: when positive pressure respirator is not worked, the breach of lever is near the upper end of connecting rod, the end points of rocking bar does not touch the liner plate of diaphragm bottom yet, and two faces of diaphragm all only are subjected to the pressure of air, and pressure is identical.When the wearer inhales first implication, because in the cavity of resorption is negative pressure, diaphragm and connecting rod are moved down simultaneously, thereby breach one end that drives lever moves down, under the effect of extension spring power, make breach one end of lever downward thrust be arranged to diaphragm, diaphragm moves down, promote rocking bar and open air intake valve, supply valve is imported gas in face shield, after this, intake valve is just according to the air-breathing regular movement of opening, cutting out when exhaling, the characteristics of motion of outlet valve is then opposite, closes when being air-breathing, opens during expiration.

Fig. 1 is the structural representation of the positive-pressure type mechanism of positive pressure respirator;

Fig. 2 is the structural representation of supply valve;

Fig. 3 is the structural representation of outlet valve;

Fig. 4 is the structural representation of lever;

Face shield 1 is arranged, supply valve 2, outlet valve 3, conduit 4, compression spring 5 among the figure, intake valve 6, liner plate 7, rocking bar 8, connecting rod 9, diaphragm 10, lever 11, rocking bar end points 12, balance pivot 13, lower house 14, upper shell 15, extension spring 16, valve sleeve 17, lower cover 18, lever 19, face shield joint seat 20 is adjusted screw 21, adjusts seat 22, regulating spring 23, valve block 24, valve seat 26, valve rod 27.

Claims

A kind of " positive-pressure type mechanism " of the positive pressure type air respiratorresuscitator of being made up of the following outlet valve (3) of face shield (1), face shield (1) and supply valve (2) and the conduit (4) that links to each other with supply valve (2) is characterized in that:

A). in the upper shell (15) of supply valve (2), adopted extension spring (16), connecting rod (9), lever (11) and balance pivot (13).Connecting rod (9) passes diaphragm (10) and is fixed on the following liner plate (7) of diaphragm (10), lever (11) is movable the binding with balance pivot (13), lever (11) one ends and extension spring (16) link, the breach of the other end (19) is enclosed within on the connecting rod (9), connecting rod (9) moves with diaphragm (10) is upper and lower in the course of the work, the breach (19) of lever (11) is along the upper and lower slip of connecting rod (9), rocking bar (8), intake valve (6) and compression spring (5) all are contained in the valve sleeve (17), and valve sleeve (17) is contained in the lower cover (18) of lower house (14);

B). outlet valve (3) is made up of valve block (24), valve rod (27), liner (25), valve seat (26), adjustment seat (22), adjustment screw (21) and regulating spring (23), after valve block (24), valve rod (27) and liner (25) assembling, be installed in again on the valve seat (26), the circular hole that valve rod (27) passes valve seat (26) can upper and lowerly slide, promote valve block (24), liner (25) is upper and lower moves, regulating spring (23) two ends are enclosed within the upper end of adjusting screw (21) lower end and valve rod (27) respectively, and valve seat (26) is fixed on the face shield joint seat (20).