CN105641791A

CN105641791A - First-aid respirator

Info

Publication number: CN105641791A
Application number: CN201610154721.7A
Authority: CN
Inventors: 王凤卿
Original assignee: Peking University Shenzhen Hospital
Current assignee: Peking University Shenzhen Hospital
Priority date: 2016-03-17
Filing date: 2016-03-17
Publication date: 2016-06-08
Anticipated expiration: 2036-03-17
Also published as: CN105641791B

Abstract

The invention relates to a first-aid respirator which comprises an elastic extrusion ball, a respiration mask, a pressure adjusting valve and an air filter, wherein the elastic extrusion ball comprises a first air inlet end and an air outlet end; the respiration mask is connected with the air outlet end; a first one-way valve is arranged inside the air outlet end; the first one-way valve is communicated in the direction from the air outlet end to the respiration mask; the pressure adjusting valve is arranged at the air outlet end and is used for controlling pressure of air inside the air outlet end according to the opening degree of the air outlet end; the air filter is connected with the air inlet end; a second one-way valve is arranged inside the air inlet end; the second one-way valve is communicated in the direction to the air inlet end from the air filter. According to the first-aid respirator provided by the invention, as the air filter is arranged at the air inlet end of the elastic extrusion ball, damage caused by pollutants in air to the body of a patient can be reduced, and body recovery of the patient can be promoted.

Description

Rescue breathing apparatus

Technical field

The present invention relates to first-aid articles for use technical field, particularly to a kind of rescue breathing apparatus.

Background technology

Simply respirator is also known as recovery ball. Suitable in cardio-pulmonary resuscitation and the occasion needing artificial respiration's first aid. Be especially adapted for use in suffocate, dyspnea or need improve oxygen-supplying amount situation. The feature there is light, few intercurrent disease easy to use, painful, being easy to carry, all can ventilating immediately with or without oxygen source.

Simply respirator of the prior art, generally comprise breathing mask and extrusion ball, breathing mask is connected to the outlet side of extrusion ball, and the inlet end of extrusion ball generally arranges a check valve, outside air can suck extrusion ball by check valve, it is squeezed into breathing mask again through extrusion ball, enters human body finally by breathing mask. Due to the most condition extremely feeble of the patient in first aid, it is directly sucked in the air of outside, owing to air existing various pollutant, pathogenic bacteria etc., so, it is unfavorable for patient body recovering state.

Summary of the invention

Present invention is primarily targeted at, for above-mentioned deficiency of the prior art, it is provided that a kind of rescue breathing apparatus.

This invention address that prior art problem be the technical scheme is that a kind of rescue breathing apparatus, including:

Elastic extrusion ball, described elastic extrusion ball has an inlet end and an outlet side;

Breathing mask, described breathing mask is connected with described outlet side, and is provided with the first check valve in described outlet side, and described first check valve leads to the direction conducting of described breathing mask from described outlet side;

Pressure-regulating valve, described pressure-regulating valve is arranged at described outlet side, in order to control gas pressure in described outlet side according to its aperture size;

Air filter, described air filter is connected with described inlet end, and is provided with the second check valve in described inlet end, and described second check valve leads to the direction conducting of described inlet end from described air filter.

Preferably, also including storage oxygen bag, described storage oxygen bag is connected with described inlet end, and is provided with the 3rd check valve in described inlet end, and described 3rd check valve leads to the direction conducting of described elastic extrusion ball from described inlet end.

Preferably, described air filter includes:

Housing, described housing has the first relative end and the second end, and described first end is provided with air inlet, and described second end is blind end;

Filtration core, described filtration core is arranged in described housing, and it includes the first froth bed, the first filter element layer and water accepting layer, and described first froth bed, the first filter element layer and water accepting layer set gradually along described first end to the direction of the second end;

Airway, described airway has an air inlet and a gas outlet, described airway is arranged on described housing, and described air inlet is positioned at described housing and closes on described second end, described gas outlet is positioned at outside described housing and closes on described first end, and described gas outlet is connected to described second check valve.

Preferably, described filtration core also includes the second froth bed and the second filter element layer, and described water accepting layer, the second froth bed and the second filter element layer set gradually along described first end to the direction of the second end.

Preferably, described first filter element layer and the second filter element layer are polyester filter material, and described water accepting layer is silica-gel desiccant.

Preferably, described pressure-regulating valve includes:

Fore shell, for cylindrical shape, is formed in described fore shell along the through gas passage of the axis of described fore shell, and the front end of described fore shell is connected to the outlet side of described elastic extrusion ball, and the outer surface of the rear end of described fore shell is provided with spiral slide;

Back cover, for cylindrical shape, the front end of described back cover is opening end, the rear end of described back cover is blind end, the opening end of described back cover is sheathed on the rear end of described fore shell, and can along the axial sliding movement of described fore shell, the blind end of described back cover is provided with through hole, and forms accommodation space between the rear end of the blind end of described back cover and described fore shell;

First spring, described first spring provides the elastic force of the axis direction along described fore shell for described back cover;

Arc breathes sheet, and described arc is breathed sheet and is arranged in described accommodation space, and protrudes towards the blind end of described back cover, and under positive air pressure effect, described arc breathes sheet deformation so that described gas passage is turned on described through hole by described accommodation space;

Rotary switch, its one end is opening end, and the other end is blind end, and the opening end of described rotary switch is sheathed on the outside of described back cover, and the inwall of the opening end of rotary switch is provided with sliding part, and described sliding part and described spiral slide are slidably matched; The blind end of described rotary switch is provided with steam vent;

Second spring, described second spring is arranged between the blind end of described back cover and the blind end of described rotary switch;

Sealing ring, described sealing ring is arranged between the blind end of described back cover and the blind end of described rotary switch;

When described rotary switch rotates in the first direction, described first spring can be made first to compress, described arc is breathed sheet and is extruded, then, described second spring-compressed, the blind end of described back cover and the blind end of described rotary switch are close to sealing with described sealing ring, and described steam vent forms non-interconnected state with the isolation of described through hole;

When described rotary switch rotates along with first direction opposite direction, described first spring, the second spring release can be made to reset, described arc is breathed sheet and is recovered, the blind end of described back cover and the blind end of described rotary switch and described sealing ring away from, described steam vent forms connected state with the conducting of described through hole.

Preferably, described first spring is compression spring, and the second spring is butterfly spring or C-spring.

Preferably, the axially projecting formation one in the rear end round platform of described fore shell, form a step surface between described round platform and described fore shell, described first spring, described back cover opening end be sheathed on described round platform, described first spring is between the opening end end face of described step surface and described back cover.

Preferably, the end face of the blind end of described back cover is provided with groove, and described sealing ring is arranged in described groove.

Preferably, described through hole is positioned at the inner side of described sealing ring, and described steam vent is positioned at the outside of described sealing ring.

According to rescue breathing apparatus provided by the invention, inlet end at elastic extrusion ball is provided with air filter, after outside air is filtered by this air filter, form clean fresh air and enter to elastic extrusion ball, human body is entered again through elastic extrusion ball, so, reduce the pollutants in air infringement to patient body, be beneficial to patient body and recover.

Accompanying drawing explanation

Fig. 1 is the overall structure schematic diagram of embodiment of the present invention rescue breathing apparatus;

Fig. 2 is the structural representation of embodiment of the present invention rescue breathing apparatus air filter;

Fig. 3 is the structural representation of pressure-regulating valve in embodiment of the present invention rescue breathing apparatus.

Accompanying drawing labelling:

Elastic extrusion ball 10;

Inlet end 101;

Outlet side 102;

Breathing mask 20;

Pressure-regulating valve 30;

Fore shell 301; Gas passage 3011; Round platform 3012;

Back cover 302; Through hole 3021; Accommodation space 3022;

First spring 303;

Arc breathes sheet 304;

Rotary switch 305; Steam vent 3051;

Second spring 306;

Sealing ring 307;

Air filter 40;

Housing 401; Air inlet 4011;

First froth bed 402;

First filter element layer 403;

Water accepting layer 404;

Second froth bed 405;

Second filter element layer 406;

Airway 407; Gas outlet 4071; Air inlet 4072.

Storage oxygen bag 50.

The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.

Detailed description of the invention

Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish. The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.

In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.

Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic. Thus, define " first ", the feature of " second " can express or implicitly include one or more these features. In describing the invention, " multiple " are meant that two or more, unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly;Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be.

With reference to, shown in Fig. 1, embodiments providing a kind of rescue breathing apparatus, including elastic extrusion ball 10, breathing mask 20, pressure-regulating valve 30 and air filter 40.

Specifically, elastic extrusion ball 10 has inlet end 101 and an outlet side 102. This elasticity extrusion ball 10 can crimp, and when unclamping extruding, it is possible to by the elastic return deformation of self.

Breathing mask 20 is connected with described outlet side 102, and is provided with the first check valve in described outlet side 102, and described first check valve leads to the direction conducting of described breathing mask 20 from described outlet side 102. This breathing mask 20 is for being worn on patient's face, covers nose and face, can pass through what breathing mask 20 be discharged when patient exhales, and when patient's air-breathing, it is possible to from breathing mask 20, suck air.

It should be noted that breathing mask 20 is common structure in state of the art, breather valve etc. is generally set inside it, is not described in detail at this.

Pressure-regulating valve 30 is arranged at described outlet side 102, in order to control gas pressure in described outlet side 102 according to its aperture size. owing to when elastic extrusion ball 10 is extruded, its internal air is to enter to outlet side 102 with certain pressure, and enters breathing mask 20 by the first check valve, eventually enters into patient pulmonary, and if hypertonia, then patient pulmonary has a negative impact. so, regulate the gas pressure in this outlet side 102 by pressure-regulating valve 30, then may insure that gas enters patient pulmonary with suitable pressure. in the present invention, the aperture of this pressure-regulating valve 30 is adjustable, then can pass through to regulate the aperture of pressure-regulating valve 30, regulate pressure in its outlet side 102, such as, when needing to reduce the pressure in its outlet side 102, the aperture of its pressure-regulating valve 30 can be increased, and then make more a part of gas be expelled to outside by this pressure-regulating valve 30, reduce the purpose of internal gas pressure, if and need to increase the pressure of its outlet side 102, then can will reduce the aperture of pressure-regulating valve 30, and then the gas being expelled to outside by this pressure-regulating valve 30 is reduced, reach to increase the purpose of internal gas pressure.

It should be noted that respiratory organ of the prior art, although it is also equipped with pop off valve, but the pressure release value of its pop off valve is non-adjustable, when internal gas pressure is more than pressure release value, by the spring jack-up in pop off valve, and then discharge a part of gas to outside. The pop off valve of this structure, it is impossible to reach arbitrarily to regulate the effect of internal gas pressure, therefore, its use is dumb, it is impossible to the different situations according to each patient, regulates a rational pressure. And in inventing, pressure-regulating valve 30 can arbitrarily regulate internal gas pressure so that doctor can regulate a rational gas pressure according to the condition of patient, then enters patient pulmonary with the air of this pressure, plays effective assisted respiartion effect.

Air filter 40 is connected with described inlet end 101, and is provided with the second check valve in described inlet end 101, and described second check valve leads to the direction conducting of described inlet end 101 from described air filter 40.

When elastic extrusion ball 10 is extruded, its internal air is to enter to outlet side 102 with certain pressure, and enter breathing mask 20 by the first check valve, eventually enter into patient pulmonary, and when unclamping elastic extrusion ball 10, elastic extrusion ball 10 recovers deformation, it is internally formed negative pressure, the air making outside enters to elastic extrusion ball 10 again through the second check valve in inlet end 101 after filtering from air filter 40, make to re-fill air in elastic extrusion ball 10, so, circulation can realize extruding assisted respiartion.

It should be noted that, owing to being provided with air filter 40 at the inlet end 101 of elastic extrusion ball 10, after outside air is filtered by this air filter 40, form clean fresh air and enter to elastic extrusion ball 10, human body is entered again through elastic extrusion ball 10, so, reduce the pollutants in air infringement to patient body, be beneficial to patient body and recover.

With reference to shown in Fig. 1, in one embodiment of the invention, also including storage oxygen bag 50, described storage oxygen bag 50 is connected with described inlet end 101, and it being provided with the 3rd check valve in described inlet end 101, described 3rd check valve leads to the direction conducting of described elastic extrusion ball 10 from described inlet end 101.

When unclamping elastic extrusion ball 10, elastic extrusion ball 10 recovers deformation, it is internally formed negative pressure, on the one hand, the air making outside enters to elastic extrusion ball 10 again through the second check valve in inlet end 101 after filtering from air filter 40 so that re-fill air in elastic extrusion ball 10, on the other hand, can so that the oxygen in storage oxygen bag 50 enters to elastic extrusion ball 10 by the 3rd check valve so that in elastic extrusion ball 10, re-fill oxygen and air.

And when again extruding elastic extrusion ball 10, its internal oxygen and air are to enter to outlet side 102 with certain pressure, and enter breathing mask 20 by the first check valve, eventually enter into patient pulmonary. In the present embodiment, set up oxygen bag and go for the patient not enough for oxygen uptake, improve patients accepting oxygen inhalation amount.

With reference to shown in Fig. 2, in a preferred embodiment of the invention, air filter 40 includes housing 401, filtration core and airway 407.

Wherein, housing 401 has the first relative end and the second end, and described first end is provided with air inlet 4011, and described second end is blind end. When elastic extrusion ball 10 is released, during its internal negative pressure, outside air can pass through the air inlet 4011 of the first end and enter to housing 401 inside.

Filtration core is arranged in described housing 401, and it includes the first froth bed 402, the first filter element layer 403 and water accepting layer 404, and described first froth bed the 402, first filter element layer 403 and water accepting layer 404 set gradually along described first end to the direction of the second end. that is, enter the air within housing 401 to flow from the first end to the second end, and, in flow process, need to sequentially pass through the first froth bed 402, first filter element layer 403 and water accepting layer 404, can the mist of oil etc. of absorbed air by the first froth bed 402, simultaneously, can so that the air sucked can uniformly enter the first follow-up filter element layer 403 and water accepting layer 404, the pollutant then can crossed in air filtering by the first filter element layer 403 (include dust granules, pathogenic bacteria etc.), the moisture removed in air then can be adsorbed again through water accepting layer 404, and then obtain clean pure and fresh air.

Airway 407 has air inlet 4072 and a gas outlet 4071, described airway 407 is arranged on described housing 401, and described air inlet 4072 is positioned at described housing 401 and closes on described second end, described gas outlet 4071 is positioned at outside described housing 401 and closes on described first end, and described gas outlet 4071 is connected to described second check valve.

The clean fresh air formed after being filtered by filtration core, in the blind end of housing 401, the air inlet 4072 of airway 407 enters airway 407, enter to the inlet end 101 of elastic extrusion ball 10 again through the gas outlet 4071 of airway 407, enter to elastic extrusion ball 10 by the second check valve.

In the present embodiment, adopt the air filter 40 of said structure, it is possible to obtain cleaner air, it is ensured that the air quality that patient sucks is higher.

More favorably, in an example of the present invention, filtration core also includes the second froth bed 405 and the second filter element layer 406, and described water accepting layer the 404, second froth bed 405 and the second filter element layer 406 set gradually along described first end to the direction of the second end.

That is, the air after the moisture in air is removed by water accepting layer 404 absorption, pass sequentially through the second froth bed 405 and the second filter element layer 406 again, second froth bed 405 can remove the remaining mist of oil of air further, and can so that air can be discharged uniformly, the second filter element layer 406 then can remove the pollutant in air further, and water accepting layer 404 can be stoped to move about, so, it is possible to improve airfiltering effect further.

As preferably, the first filter element layer 403 and the second filter element layer 406 can be polyester filter material, it is possible to the pollutant below filter 23 micron, and described water accepting layer 404 is silica-gel desiccant, has better drying effect.

With reference to shown in Fig. 3, in a preferred embodiment of the invention, pressure-regulating valve 30 includes fore shell 301, back cover the 302, first spring 303, arc breathing sheet 304, rotary switch the 305, second spring 306 and sealing ring 307.

Specifically, fore shell 301 is cylindric, it is formed with along the through gas passage 3011 of the axis of described fore shell 301 in described fore shell 301, the front end of described fore shell 301 is connected to the outlet side 102 of described elastic extrusion ball 10, and the gas of the outlet side 102 of elastic extrusion ball 10 can enter to this gas passage 3011. The outer surface of the rear end of described fore shell 301 is provided with spiral slide.

Back cover 302 is cylindric, the front end of described back cover 302 is opening end, the rear end of described back cover 302 is blind end, the opening end of described back cover 302 is sheathed on the rear end of described fore shell 301, and can along the axial sliding movement of described fore shell 301, the blind end of described back cover 302 is provided with through hole 3021, and forms accommodation space 3022 between the rear end of the blind end of described back cover 302 and described fore shell 301. It is to say, back cover 302 is the rear end being set in fore shell 301, and can along axial sliding movement, when back cover 302 is along axial sliding movement, its accommodation space 3022 width on axis changes therewith.

First spring 303 provides the elastic force of axis direction along described fore shell 301 for described back cover 302, such as: when applying external force and making back cover 302 move to the direction near fore shell 301 along axis, first spring 303 is compressed, and when removing this external force, the first spring 303 discharges and then promotes back cover 302 to move to the direction away from described fore shell 301.

Arc is breathed sheet 304 and is arranged in described accommodation space 3022, and protrude towards the blind end of described back cover 302, under positive air pressure effect, described arc breathes sheet 304 deformation so that described gas passage 3011 is turned on described through hole 3021 by described accommodation space 3022. After the gas in elastic extrusion ball 10 enters to gas passage 3011 with certain pressure (positive air pressure), arc can be forced to breathe the softened certain gap of edge deformation of sheet 304, then make gas enter accommodation space 3022, then enter to the through hole 3021 blind end of back cover 302 from accommodation space 3022.

One end of rotary switch 305 is opening end, the other end is blind end, the opening end of described rotary switch 305 is sheathed on the outside of described back cover 302, and the inwall of the opening end of rotary switch 305 is provided with sliding part, described sliding part and described spiral slide are slidably matched, move it is to say, rotary switch 305 can pass through rotation mode at axis direction. The blind end of described rotary switch 305 is provided with steam vent 3051, enters to the gas of through hole 3021, can get rid of to outside again through this steam vent 3051.

Second spring 306 is arranged between blind end and the blind end of described rotary switch 305 of described back cover 302. It is to say, the second spring 306 makes to have between the blind end of back cover 302 and the blind end of rotary switch 305 certain gap, when rotary switch 305 rotates and moves along the direction near back cover 302 on axis, the second spring 306 is compressed.

Sealing ring 307 is arranged between blind end and the blind end of described rotary switch 305 of described back cover 302. When rotary switch 305 moves near the direction of back cover 302, and when the second spring 306 is compressed into extreme position, sealing ring 307 can be fitted with the blind end of the blind end of back cover 302 and rotary switch 305.

As preferably, the end face of the blind end of back cover 302 is provided with groove, and described sealing ring 307 is arranged in described groove, so, it is possible to the installation being easy to sealing ring 307 is fixed.

When described rotary switch 305 rotates in the first direction, described first spring 303 can be made first to compress, described arc is breathed sheet 304 and is extruded, then, described second spring 306 compresses, the blind end of described back cover 302 and the blind end of described rotary switch 305 are close to sealing with described sealing ring 307, and described steam vent 3051 forms non-interconnected state with the isolation of described through hole 3021. that is, first spring 303 is compressed required startup pressure by the pressure that starts that compression is required less than the second spring 306, so, rotation along with rotary switch 305, the accommodation space 3022 width on axis is gradually reduced, it is more tight that its internal arc breathing sheet 304 is extruded, now, its internal gas needs bigger pressure can strut the edge of this arc breathing sheet 304, and when rotary switch 305 continues to rotate, and second spring 306 compressed to extreme position, then sealing ring 307 is fitted with the blind end of back cover 302 and the blind end of rotary switch 305, form sealing state, steam vent 3051 and through hole 3021 block, now, namely pressure-regulating valve 30 closed mode (aperture is zero).

When described rotary switch 305 rotates along with first direction opposite direction, described first spring the 303, second spring 306 release can be made to reset, described arc is breathed sheet 304 and is recovered, the blind end of described back cover 302 and the blind end of described rotary switch 305 and described sealing ring 307 away from, described steam vent 3051 forms connected state with the conducting of described through hole 3021. It is to say, reversely rotate this rotary switch 305, the second spring 306 resets so that the gap between blind end and the blind end of back cover 302 of rotary switch 305 is gradually increased, and through hole 3021 connects again with steam vent 3051. Simultaneously, first spring 303 resets, the accommodation space 3022 width on axis can be made to be gradually increased, its internal arc is breathed sheet 304 and is restPosed gradually, now, its internal gas has only to less pressure just can strut the edge of this arc breathing sheet 304, and namely pressure-regulating valve 30 is in maximum opening state.

Take this, by the adjustment of this rotary switch 305, it is possible to achieve the aperture of this pressure-regulating valve 30 regulates, and then realizes freely regulating of pressure.

As preferably, the first spring 303 can be compression spring, and the second spring 306 can be butterfly spring or C-spring.

More specifically, in an example of the present invention, the axially projecting formation one in the rear end round platform 3012 of fore shell 301, a step surface is formed between described round platform 3012 and described fore shell 301, described first spring 303, described back cover 302 opening end be sheathed on described round platform 3012, described first spring 303 is between the opening end end face of described step surface and described back cover 302. So, facilitate the socket between fore shell 301 and back cover 302, and, it is simple to the installation of the first spring 303, it is simple and compact for structure rationally, easy to assembly.

As preferably, through hole 3021 is positioned at the inner side of described sealing ring 307, described steam vent 3051 is positioned at the outside of described sealing ring 307, so, when sealing ring 307 is fitted with the blind end of back cover 302 and the blind end of rotary switch 305, through hole 3021 and intercommunicating pore 3021 can be made to block each other.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.

Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, being not considered as limiting the invention, above-described embodiment can be changed when without departing from principles of the invention and objective, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.

Claims

1. a rescue breathing apparatus, it is characterised in that including:

2. rescue breathing apparatus according to claim 1, it is characterized in that, also including storage oxygen bag, described storage oxygen bag is connected with described inlet end, and it being provided with the 3rd check valve in described inlet end, described 3rd check valve leads to the direction conducting of described elastic extrusion ball from described inlet end.

3. rescue breathing apparatus according to claim 1, it is characterised in that described air filter includes:

4. rescue breathing apparatus according to claim 3, it is characterised in that described filtration core also includes the second froth bed and the second filter element layer, and described water accepting layer, the second froth bed and the second filter element layer set gradually along described first end to the direction of the second end.

5. rescue breathing apparatus according to claim 3, it is characterised in that described first filter element layer and the second filter element layer are polyester filter material, and described water accepting layer is silica-gel desiccant.

6. rescue breathing apparatus according to claim 1, it is characterised in that described pressure-regulating valve includes:

7. rescue breathing apparatus according to claim 6, it is characterised in that described first spring is compression spring, and the second spring is butterfly spring or C-spring.

8. rescue breathing apparatus according to claim 7, it is characterized in that, the axially projecting formation one in the rear end round platform of described fore shell, a step surface is formed between described round platform and described fore shell, described first spring, described back cover opening end be sheathed on described round platform, described first spring is between the opening end end face of described step surface and described back cover.

9. rescue breathing apparatus according to claim 6, it is characterised in that the end face of the blind end of described back cover is provided with groove, and described sealing ring is arranged in described groove.

10. rescue breathing apparatus according to claim 9, it is characterised in that described through hole is positioned at the inner side of described sealing ring, and described steam vent is positioned at the outside of described sealing ring.