Isolation type circulating respiratory protection device

Abstract

The utility model discloses an isolated type circulating respiratory protection device. The protection device comprises a protection cover, a breathing apparatus arranged in the protection cover, an air bag arranged outside the protection cover and communicated with the breathing apparatus, a carbon dioxide absorbent bin arranged between the air bag and the breathing apparatus, and an oxygen supply device arranged outside the protection cover and communicated with the air bag. The protective cover is a hollow protective cover capable of at least containing the head, an opening for at least the head to stretch in is formed in the protective cover, and a tightening device capable of tightening the opening is arranged at the opening. The oxygen supply device comprises an oxygen bottle and a trigger switch for controlling the oxygen bottle to supply air into the air bag.

Description

Technical Field

[0001] The utility model relates to the field of fire protection, and more specifically to an isolated circulating breathing protection device. Background Art

[0002] As a fire-fighting equipment, respiratory protection devices are used by firefighters or emergency rescue personnel to safely and effectively carry out fire extinguishing, emergency rescue and other rescue work in various environments such as thick smoke, toxic gas, steam or lack of oxygen. They provide respiratory protection for people trapped in the above scenes to avoid being harmed, so that they can safely escape from the trapped environment.

[0003] Most of the existing respiratory protection devices are in the form of fire-fighting respiratory protection masks, and most of the fire-fighting respiratory protection masks are of filtering type. When a user wears a filtering mask, the outside air is first sucked into the filtering device for filtration when inhaling, and then enters the mask for the user to inhale, and the exhaled gas is directly discharged outside the mask when exhaling. Although this open respiratory protection mask can filter the outside air to a certain extent, when the external environment is more complicated, it is difficult for the filtering device to completely filter the harmful gases in the outside world, and it is difficult to avoid the harmful gases in the external environment from causing harm to the trapped persons, which is not convenient for safe escape from the trapped environment. Utility Model Content

[0004] The utility model aims at solving the above-mentioned defects of the prior art and provides an isolated circulation breathing protection device.

[0005] The utility model solves the technical problem by adopting a technical solution: constructing an isolated recirculating breathing protective device, the protective device comprising a protective cover, a breathing apparatus arranged in the protective cover, an air bag arranged outside the protective cover and communicating with the breathing apparatus, a carbon dioxide absorbent bin arranged between the air bag and the breathing apparatus, and an oxygen supply device arranged outside the protective cover and communicating with the air bag, the protective cover is a hollow protective cover capable of accommodating at least the head, an opening capable of at least allowing the head to extend into is arranged on the protective cover, and a tightening device capable of tightening the opening is arranged at the opening;

[0006] The oxygen supply device comprises an oxygen cylinder and a trigger switch for controlling the oxygen cylinder to supply gas into the air bag.

[0007] In the isolated respirator protective device described in the utility model, the tightening device is a tightening belt arranged at the opening of the protective cover, and the end of the tightening belt is connected with a pull ring.

[0008] In the isolated rebreathing protective device described in the present invention, the top of the carbon dioxide absorbent bin is provided with a first arched filter screen protruding outward, the bottom of the carbon dioxide absorbent bin is provided with a second arched filter screen protruding outward, and a spring sheet for pushing the second filter screen to squeeze the carbon dioxide absorbent is also provided in the carbon dioxide absorbent bin below the second filter screen.

[0009] In the isolated rebreathing protective device described in the utility model, the protective device also includes a strap that can be used to hang the protective device on the body;

[0010] The two ends of the hanging belt are respectively connected to the outer side wall of the carbon dioxide absorbent bin;

[0011] Or, the two ends of the hanging strap are respectively connected to the outer side wall of the oxygen supply device;

[0012] Alternatively, two ends of the hanging strap are respectively connected to the outer side walls of the carbon dioxide absorbent bin and the oxygen supply device.

[0013] In the isolated recirculating breathing protective device described in the utility model, the breathing apparatus includes a bite and a nose clip, the bite is connected to the first side of the carbon dioxide absorbent bin via a connecting cover, and the base of the connecting cover is provided with a fold that can fold the base toward the carbon dioxide absorbent bin.

[0014] In the isolated recirculating breathing protective device described in the utility model, the bite device is provided with a breathing port connected to the connecting cover, and the nose clip is provided with a sealing plug which can be inserted into and block the breathing port.

[0015] In the isolated recirculating breathing protective device described in the utility model, the air bag is provided with a connecting nozzle connected and communicated with the second side of the carbon dioxide absorbent bin;

[0016] The oxygen supply device also includes a control valve arranged on the bottle mouth of the oxygen cylinder, the trigger switch is a trigger rod extending from the inside of the control valve to the outside of the control valve, the valve body of the control valve is provided with an air outlet for the trigger rod to extend, the aperture of the air outlet is larger than the diameter of the trigger rod, the first end of the trigger rod is located in the valve body, and the first end of the trigger rod is provided with a plug for blocking the air outlet, the second end of the trigger rod is located outside the valve body, and the second end of the trigger rod is provided with a baffle, the trigger rod is sleeved with a first spring that pushes the baffle to seal and block the air outlet, the first end of the first spring is elastically abutted against the baffle, the second end of the first spring is elastically abutted against the outer wall of the valve body, and the air outlet, the first end of the trigger rod and the baffle extend into the airbag.

[0017] In the isolated rebreathing protective device described in the utility model, a partition is provided in the middle of the valve cavity to separate the valve cavity into a first chamber and a second chamber, a first air inlet passage connecting the air inlet and the first chamber is also provided in the valve body, a second air inlet passage connecting the first chamber and the second chamber is provided on the partition, a first piston is provided in the first chamber and can be movably arranged in the first chamber and can block the first air inlet passage, and a second piston is provided in the second chamber and can be movably arranged in the second chamber and can block the second air inlet passage;

[0018] The first piston is provided with a first air flow hole penetrating the first piston, the second piston is provided with a second air flow hole penetrating the second piston, the first piston is sleeved with a second spring for pushing the first piston to open the first air intake channel, and the second piston is sleeved with a third spring for pushing the second piston to open the second air intake channel.

[0019] In the isolated rebreathing protective device described in the utility model, the first chamber is fixedly provided with a first sleeve for sleeve-mounting the first end of the second spring, the second chamber is fixedly provided with a second sleeve for sleeve-mounting the first end of the third spring, the first end of the first piston is sealedly inserted into the first sleeve, the first end outer wall of the first piston is provided with a first convex ring protruding from the outer wall of the first piston, the first convex ring abuts against the inner wall of the first sleeve, the first end of the second piston is sealedly inserted into the second sleeve, the first end outer wall of the second piston is provided with a second convex ring protruding from the outer wall of the second piston, the second convex ring abuts against the inner wall of the second sleeve;

[0020] A third convex ring protruding from the outer wall of the first piston is provided on the outer wall of the second end of the first piston, and the third convex ring abuts against the inner wall of the first chamber; a fourth convex ring protruding from the outer wall of the second piston is provided on the outer wall of the second end of the second piston, and the fourth convex ring abuts against the inner wall of the second chamber;

[0021] The first end aperture of the first air flow hole is smaller than the second end aperture of the first air flow hole, a first reduced diameter portion is provided in the middle of the first piston, the first end aperture of the second air flow hole is smaller than the second end aperture of the second air flow hole, and a second reduced diameter portion is provided in the middle of the second piston.

[0022] In the isolated recirculating breathing protection device of the utility model, at least one first washer is provided outside the first sleeve and located at the first end of the second spring, and at least one second washer is provided outside the second sleeve and located at the first end of the third spring;

[0023] The valve body is also provided with a third pressure relief hole and a pressure relief assembly arranged in the third pressure relief hole. The third pressure relief hole is located on the side wall of the valve cavity between the second piston and the stopper. A accommodating cavity for accommodating the pressure relief assembly is provided in the middle of the third pressure relief hole. The aperture of the accommodating cavity is larger than the aperture of the third pressure relief hole. The pressure relief assembly includes a fourth spring and a sealing ball. The bottom end of the fourth spring elastically abuts against the bottom wall of the accommodating cavity, and the top end of the fourth spring abuts against the top end of the sealing ball and pushes the sealing ball to seal the third pressure relief hole.

[0024] The implementation of the isolated circulation breathing protective device of the utility model has the following beneficial effects: when using the isolated circulation breathing protective device of the utility model, the user can extend part or all of the body including the head into the protective cover from the opening, wear the protective cover on the body, cover part or all of the body including the head, and then tighten the opening through the tightening device to prevent harmful gases from entering the protective cover from the opening. When the user exhales, the exhaled gas must pass through the carbon dioxide absorbent chamber into the air bag, and this process can absorb and remove the carbon dioxide in the user's exhaled gas. When the user inhales, the gas stored in the air bag is inhaled, and the gas inhaled by the user passes through the carbon dioxide absorbent chamber into the protective cover for the user to inhale. This setting further controls the proportion of carbon dioxide in the gas inhaled by the user. The user establishes an isolated breathing cycle by cyclically following the above-mentioned gas path logic, which can ensure that the user no longer breathes external gas within a certain period of time, avoid harmful gases in the external environment from causing harm to the user, and provide respiratory protection for the user's escape. When there is insufficient oxygen in the airbag, the oxygen cylinder can be controlled by triggering a switch to replenish oxygen into the airbag, thereby extending the time the user uses the protective device and achieving better protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0026] Figure 1 It is a structural schematic diagram of the utility model isolated circulation breathing protection device;

[0027] Figure 2 It is a schematic diagram of the structure of the protective cover in the isolated respirator protective device of the utility model;

[0028] Figure 3 It is a structural schematic diagram of a carbon dioxide absorbent bin and an oxygen supply device in an isolated circulating breathing protective device of the utility model;

[0029] Figure 4 It is a schematic cross-sectional structure diagram of a carbon dioxide absorbent bin in the isolated recirculating breathing protection device of the present invention;

[0030] Figure 5It is a structural schematic diagram of the oxygen supply device in the isolated circulating breathing protection device of the utility model;

[0031] Figure 6 It is a schematic cross-sectional structure diagram of a control valve in the isolated respirator protection device of the utility model;

[0032] Figure 7 It is a schematic cross-sectional structure diagram of a control valve and an oxygen cylinder in the isolated respirator protection device of the utility model;

[0033] Figure 8 It is a schematic diagram of the shell structure of the isolated circulating breathing protection device of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1-5 As shown, in the first embodiment of the isolated rebreathing protective device of the utility model, the protective device 10 includes a protective cover 11, a breathing apparatus 12 arranged in the protective cover 11, an air bag 13 arranged outside the protective cover 11 and connected to the breathing apparatus 12, a carbon dioxide absorbent tank 14 arranged between the air bag 13 and the breathing apparatus 12, and an oxygen supply device 15 arranged outside the protective cover 11 and connected to the air bag 13. The protective cover 11 is a hollow protective cover 11 that can at least accommodate the head, and an opening 16 is provided on the protective cover 11 for at least the head to extend into, and a tightening device that can tighten the opening 16 is provided at the opening 16.

[0036] The oxygen supply device 15 includes an oxygen cylinder 17 and a trigger switch 18 for controlling the oxygen cylinder 17 to supply gas into the airbag 13 .

[0037] In order to facilitate the user to observe the external environment after inserting the head into the protective cover 11, the protective cover 11 is made of a flexible transparent flame retardant material. Alternatively, a transparent portion for the user to observe is provided at the eye position of the protective cover 11. Similarly, the airbag 13 is also made of a fireproof and flame retardant material.

[0038] In this embodiment, in order to prevent the air pressure in the airbag 13 from being too high, an overpressure exhaust valve 65 is further provided on the airbag 13 .

[0039] Preferably, the trigger switch 18 can be a pressure trigger device, when the pressure in the airbag 13 is lower than a preset value, the trigger switch 18 is turned on and oxygen is added to the airbag 13 through the oxygen cylinder 17. Alternatively, the trigger switch 18 is a manual or semi-automatic trigger switch 18, when the gas in the airbag 13 is less, it is automatically or manually triggered to add gas to the airbag 13 (details will be described later).

[0040] When using the isolated circulation breathing protective device of the utility model, the user can extend part or all of the body including the head into the protective cover 11 from the opening 16, wear the protective cover 11 on the body, cover part or all of the body including the head, and then tighten the opening 16 through the tightening device to prevent harmful gases from entering the protective cover 11 from the opening 16. When the user exhales, the exhaled gas must pass through the carbon dioxide absorbent chamber 14 into the air bag 13, and this process can absorb and remove the carbon dioxide in the user's exhaled gas. When the user inhales, the gas stored in the air bag 13 is inhaled, and the gas inhaled by the user passes through the carbon dioxide absorbent chamber 14 and enters the protective cover 11 for the user to inhale. This setting further controls the proportion of carbon dioxide in the gas inhaled by the user. The user establishes an isolated breathing cycle by cyclically following the above-mentioned gas path logic, which can ensure that the user no longer breathes the outside gas within a certain period of time, avoid the harmful gas in the outside environment from causing harm to the user, and provide respiratory protection for the user's escape. When the airbag 13 is short of oxygen, the oxygen cylinder 17 can be controlled by triggering the switch 18 to add oxygen to the airbag 13, thereby extending the time for the user to use the protective device 10 and achieving a better protective effect.

[0041] Specifically, Figure 2 As shown, the tightening device is a tightening belt 19 arranged at the opening 16 of the protective cover 11 , and a pull ring 20 is connected to the end of the tightening belt 19 .

[0042] Preferably, the tightening belt 19 may also be an elastic tightening belt 19 .

[0043] When in use, after the head is inserted into the protective cover 11, the opening 16 is located at the neck of the human body. The tightening belt 19 can be tightened to tighten the bottom opening 16 of the protective cover 11 to the user's neck to prevent harmful gases in the external environment from entering the protective cover 11 through the opening 16.

[0044] Further, such as Figure 1 As shown, the protective device 10 further comprises a strap 21 for hanging the protective device 10 on the body.

[0045] When the user wears the protective device 10, the strap 21 can be hung on the head or neck to prevent the protective device 10 from falling off the user's body, and also to facilitate carrying. Preferably, the strap 21 is also provided with an adjusting piece for adjusting the length of the strap 21.

[0046] In one embodiment, two ends of the hanging strap 21 are respectively connected to the outer side walls of the carbon dioxide absorbent chamber 14 .

[0047] In another embodiment, the two ends of the hanging strap 21 are respectively connected to the outer side walls of the oxygen supply device 15; or, the two ends of the hanging strap 21 are respectively connected to the outer side walls of the carbon dioxide absorbent chamber 14 and the oxygen supply device 15.

[0048] In this embodiment, the oxygen cylinder 17 is fixed to the outer wall of the carbon dioxide absorbent chamber 14 via a ring.

[0049] In this embodiment, if Figure 3 As shown, the breathing apparatus 12 includes a bite 22 and a nose clip 23. The bite 22 is connected to the first side of the carbon dioxide absorbent chamber 14 via a connecting cover 64. The base of the connecting cover 64 is provided with a fold 26 that can fold the base toward the carbon dioxide absorbent chamber 14.

[0050] Furthermore, the bite 22 is provided with a breathing port 24 connected to the communication cover 64, and the nose clip 23 is provided with a sealing plug 25 that can be inserted into the breathing port 24 and block the breathing port 24. The nose clip 23 and the bite 22 are connected by a connecting rope.

[0051] When the protective device 10 is stored, the sealing plug 25 on the nose clip 23 can be inserted into the breathing port 24 to prevent outside air from entering the carbon dioxide absorbent chamber 14 and causing the carbon dioxide absorbent to become ineffective. Furthermore, the base of the connecting cover 64 can be folded along the fold 26 to reduce the space of the protective device 10 for easy storage.

[0052] Specifically, the air bag 13 is provided with a connection nozzle 27 connected and communicated with the second side of the carbon dioxide absorbent chamber 14 .

[0053] In order to facilitate the user to wear and use the protective device 10 for a longer period of time, the carbon dioxide absorbent chamber 14 is filled with an oxygen generator that absorbs carbon dioxide and generates oxygen.

[0054] In one embodiment, the oxygen generator is potassium superoxide, which absorbs carbon dioxide and generates oxygen, and the reaction formula is as follows:

[0055] 4KO 2 +2CO 2 =2K 2 CO 3 +3O 2

[0056] Further, such as Figure 4 As shown, the top of the carbon dioxide absorbent bin 14 is provided with a first arched filter screen 141 protruding outward, the bottom of the carbon dioxide absorbent bin 14 is provided with a second arched filter screen 142 protruding outward, and the carbon dioxide absorbent bin 14 is also provided with a spring sheet 143 below the second filter screen 142 for pushing the second filter screen 142 to squeeze the carbon dioxide absorbent.

[0057] In the present application, the reaction area between carbon dioxide and carbon dioxide absorbent can be increased by providing the arched first filter screen 141 and the arched second filter screen 142, so that carbon dioxide can be fully absorbed. By providing the spring sheet 143, after the carbon dioxide absorbent absorbs carbon dioxide for reaction, the carbon dioxide absorbent that may collapse after the reaction can be compressed, so that the carbon dioxide absorbent continues to fully absorb carbon dioxide, and carbon dioxide is prevented from passing through the gap of the collapsed carbon dioxide absorbent.

[0058] like Figure 5-7 As shown, the oxygen supply device 15 also includes a control valve 28 disposed on the bottle mouth of the oxygen bottle 17, the trigger switch 18 is a trigger rod 32 extending from the control valve 28 to the outside of the control valve 28, and a valve body 29 of the control valve 28 is provided with an air outlet 31 for the trigger rod 32 to extend, the aperture of the air outlet 31 is larger than the diameter of the trigger rod 32, the first end of the trigger rod 32 is located in the valve body 29, and the first end of the trigger rod 32 is provided with a cap for blocking the air outlet The trigger rod 32 has a stopper 33 disposed on the valve body 29, and the second end of the trigger rod 32 is provided with a stopper 34. The trigger rod 32 is sleeved with a first spring 35 that pushes the stopper 33 to seal and block the air outlet 31. The first end of the first spring 35 elastically abuts against the stopper 34, and the second end of the first spring 35 elastically abuts against the outer wall of the valve body 29. The air outlet 31, the first end of the trigger rod 32 and the stopper 34 extend into the airbag 13.

[0059] Preferably, the air outlet 31 , the first end of the trigger rod 32 and the blocking piece 34 extend into the airbag 13 from the connecting nozzle 27 .

[0060] When the gas in the airbag 13 is reduced to only one third, the airbag 13 is deflated by the atmospheric pressure, so that the inner wall of the airbag 13 pushes against the second end of the trigger rod 32 and its baffle 34. At this time, the trigger rod 32 tilts, and the trigger rod 32 drives the baffle 33 to tilt and no longer completely blocks the gas outlet 31. At this time, the high-pressure oxygen in the oxygen cylinder 17 can enter the airbag 13 through the valve cavity of the control valve 28 and the gas outlet 31 to oxygenate the airbag 13. During the oxygenation process of the airbag 13, the airbag 13 gradually swells, so that the inner wall of the airbag 13 is separated from the trigger rod 32 and the baffle 34. The trigger rod 32 drives the baffle 33 again under the elastic restoring force of the first spring 35 to seal and block the gas outlet 31, and the oxygenation of the airbag 13 stops.

[0061] Preferably, the pressure reducing control valve 28 is a double piston pressure reducing control valve 28, which realizes double-stage piston pressure reducing by double pistons, and makes the air pressure in the pressure reducing control valve 28 reach balance. Specifically, a partition 36 is provided in the middle of the valve cavity to separate the valve cavity into a first chamber 37 and a second chamber 38, and a first air inlet passage 41 connecting the air inlet 30 and the first chamber 37 is also provided in the valve body 29, and a second air inlet passage 42 connecting the first chamber 37 and the second chamber 38 is provided on the partition 36, and a first piston 39 is provided in the first chamber 37, which is sealed and movably arranged in the first chamber 37 and can block the first air inlet passage 41, and a second piston 40 is provided in the second chamber 38, which is sealed and movably arranged in the second chamber 38 and can block the second air inlet passage 42.

[0062] Furthermore, the first piston 39 is provided with a first air flow hole 51 that passes through the first piston 39, the second piston 40 is provided with a second air flow hole 52 that passes through the second piston 40, the first piston 39 is sleeved with a second spring 43 that pushes the first piston 39 to open the first air intake channel 41, and the second piston 40 is sleeved with a third spring 44 that pushes the second piston 40 to open the second air intake channel 42.

[0063] Furthermore, the first chamber 37 is fixedly provided with a first sleeve 45 on which the first end of the second spring 43 can be sleeved, and the second chamber 38 is fixedly provided with a second sleeve 46 on which the first end of the third spring 44 can be sleeved, the first end of the first piston 39 is sealably inserted into the first sleeve 45, and the first end outer wall of the first piston 39 is provided with a first convex ring 47 protruding from the outer wall of the first piston 39, and the first convex ring 47 abuts against the inner wall of the first sleeve 45, the first end of the second piston 40 is sealably inserted into the second sleeve 46, and the first end outer wall of the second piston 40 is provided with a second convex ring 48 protruding from the outer wall of the second piston 40, and the second convex ring 48 abuts against the inner wall of the second sleeve 46.

[0064] Furthermore, a third convex ring 49 is provided on the outer side wall of the second end of the first piston 39 and protrudes from the outer side wall of the first piston 39, and the third convex ring 49 abuts against the inner wall of the first chamber 37. A fourth convex ring 50 is provided on the outer side wall of the second end of the second piston 40 and protrudes from the outer side wall of the second piston 40, and the fourth convex ring 50 abuts against the inner wall of the second chamber 38.

[0065] Furthermore, the first end aperture of the first air flow hole 51 is smaller than the second end aperture of the first air flow hole 51 , a first reduced diameter portion 53 is provided in the middle of the first piston 39 , the first end aperture of the second air flow hole 52 is smaller than the second end aperture of the second air flow hole 52 , and a second reduced diameter portion 54 is provided in the middle of the second piston 40 .

[0066] When the trigger rod 32 is tilted, the stopper 33 no longer completely blocks the air outlet 31, and oxygen flows out from the air inlet 30, the first air inlet channel 41, the first air hole 51, the second air inlet channel 42, and the second air hole 52 through the air outlet 31. When the air pressure in the first chamber 37 and the second chamber 38 is too high, the air pressure pushes the first reduced diameter portion 53 and the second reduced diameter portion 54 in the opposite direction, so that the first piston 39 moves toward the rear end of the first chamber 37, and the second piston 40 moves toward the partition 36, until the end of the first piston 39 abuts against the rear end wall of the first chamber 37, and the end of the second piston 40 abuts against the side wall of the partition 36, the first air hole 51 and the second air hole 52 are blocked, and the gas in the oxygen cylinder 17 no longer enters the first chamber 37 and the second chamber 38. Until the oxygen in the first chamber 37 and the second chamber 38 gradually flows out from the gas outlet 31, under the elastic restoring force of the second spring 43 and the third spring 44, the first piston 39 and the second piston 40 move away from the tail end wall of the first chamber 37 and the partition 36, so that the first air flow hole 51 and the second air flow hole 52 are connected, and the oxygen in the oxygen cylinder 17 enters the first chamber 37 and the second chamber 38 again. Repeat the above process until the oxygen in the protective cover 11 or the air bag 13 is replenished, the trigger rod 32 is no longer tilted, the first spring 35 drives the stopper 33 to seal and block the gas outlet 31, and the oxygen cylinder 17 completes the automatic oxygen supply to the protective cover 11 or the air bag 13.

[0067] In the present application, a double piston is provided, and due to the different force areas at both ends of the piston, the pressure at the small end is smaller, and the pressure at the large end is larger. When the force on the large head section is greater than the force on the small head and the elastic force of the spring, the first air flow hole 51 and the second air flow hole 52 are blocked, thereby achieving decompression.

[0068] In the present application, by providing a double piston for decompression, a better stable inflation effect can be achieved, preventing the excessive air pressure in the oxygen cylinder 17 from causing damage to the protective cover 11 or the airbag 13.

[0069] In order to achieve a better sealing effect, the first convex ring 47 is provided with a first sealing ring abutting against the inner wall of the first sleeve 45, the second convex ring 48 is provided with a second sealing ring abutting against the inner wall of the second sleeve 46, the third convex ring 49 is provided with a third sealing ring abutting against the inner wall of the first chamber 37, and the fourth convex ring 50 is provided with a fourth sealing ring abutting against the inner wall of the second chamber 38.

[0070] Furthermore, the valve body 29 is also provided with a first pressure relief hole 55 communicating with the first chamber 37 , and a second pressure relief hole communicating with the second chamber 38 .

[0071] To facilitate adjustment of the elastic force of the second spring 43 and the third spring 44 , at least one first washer 56 is provided outside the first sleeve 45 at the first end of the second spring 43 , and at least one second washer 57 is provided outside the second sleeve 46 at the first end of the third spring 44 .

[0072] When the elastic force of the second spring 43 and the third spring 44 needs to be increased, more first washers 56 and second washers 57 can be added, or the thickness of the first washers 56 and second washers 57 can be increased. When the elastic force of the second spring 43 and the third spring 44 needs to be weakened, fewer first washers 56 and second washers 57 can be added, or the thickness of the first washers 56 and second washers 57 can be reduced.

[0073] Furthermore, in order to prevent the air pressure in the valve body 29 from being too high, the valve body 29 is also provided with a third pressure relief hole 58 and a pressure relief component arranged in the third pressure relief hole 58. The third pressure relief hole 58 is located on the side wall of the valve cavity between the second piston 40 and the plug 33. A accommodating cavity for accommodating the pressure relief component is provided in the middle of the third pressure relief hole 58. The aperture of the accommodating cavity is larger than the aperture of the third pressure relief hole 58. The pressure relief component includes a fourth spring 59 and a sealing ball 60. The bottom end of the fourth spring 59 elastically abuts against the bottom wall of the accommodating cavity, and the top end of the fourth spring 59 abuts against the top end of the sealing ball 60 and pushes the sealing ball 60 to seal the third pressure relief hole 58.

[0074] When the air pressure in the valve cavity is too high, the high-pressure gas pushes the sealing ball 60 downward, and the fourth spring 59 is compressed, the sealing ball 60 is separated from the third pressure relief hole 58, and the gas is discharged from the third pressure relief hole 58. When the air pressure in the valve cavity is lower, the fourth spring 59 pushes the sealing ring to block the third pressure relief hole 58 again under the action of its own elastic restoring force to prevent gas leakage.

[0075] In this embodiment, the pressure reducing control valve 28 further includes a charging port 61 disposed on the valve body 29 and communicating with the air inlet 30 , and a hexagon socket bolt cover 62 covering the charging port 61 .

[0076] When the oxygen in the oxygen cylinder 17 is insufficient, the hexagon socket bolt cover 62 can be opened and the oxygen cylinder 17 can be inflated through the inflation port 61 .

[0077] Furthermore, the pressure reducing control valve 28 also includes a main valve switch 63 disposed on the valve body 29 for controlling the disconnection or connection between the air inlet 30 and the first air inlet passage 41 .

[0078] The user can pull the safety pin on the main valve switch 63 to drive the piston rod of the main valve switch 63 to move, thereby opening the air inlet 30 and the first air inlet channel 41. When the safety pin is released, the piston rod restores the closure of the air inlet 30 and the first air inlet channel 41 under the push of the spring.

[0079] Furthermore, the pressure reducing control valve 28 also includes a pressure gauge disposed on the valve body 29 and connected to the air inlet 30 .

[0080] Furthermore, the pressure reducing control valve 28 also includes a safety valve (not shown) disposed on the valve body 29 and connected to the air inlet 30 . The safety valve is used to open the safety valve to release part of the oxygen and reduce the air pressure in the oxygen cylinder 17 when the oxygen pressure in the oxygen cylinder 17 is too high.

[0081] The protection device 10 further includes a housing 80 for housing the protection device 10 . The housing 80 is provided with an airtightness inspection hole 81 for detecting airtightness inside the housing, and an overpressure exhaust hole 82 for exhausting excess gas when the air pressure inside the housing 80 is abnormal.

[0082] In addition, in the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An isolated respirator, characterized in that: The protective device comprises a protective cover, a breathing apparatus arranged in the protective cover, an air bag arranged outside the protective cover and connected to the breathing apparatus, a carbon dioxide absorbent tank arranged between the air bag and the breathing apparatus, and an oxygen supply device arranged outside the protective cover and connected to the air bag. The protective cover is a hollow protective cover capable of accommodating at least the head, an opening capable of at least allowing the head to extend into is provided on the protective cover, and a tightening device capable of tightening the opening is provided at the opening; The oxygen supply device includes an oxygen cylinder and a trigger switch for controlling the oxygen cylinder to supply gas into the airbag.

2. The isolated rebreathing protective device according to claim 1, characterized in that: The tightening device is a tightening belt arranged at the opening of the protective cover, and the end of the tightening belt is connected with a pull ring.

3. The isolated rebreathing protective device according to claim 1, characterized in that: The top of the carbon dioxide absorbent bin is provided with an outwardly protruding arched first filter screen, the bottom of the carbon dioxide absorbent bin is provided with an outwardly protruding arched second filter screen, and a spring sheet for pushing the second filter screen to squeeze the carbon dioxide absorbent is also provided below the second filter screen in the carbon dioxide absorbent bin.

4. The isolated rebreathing protective device according to claim 1, characterized in that: The protective device also includes a strap that can be used to hang the protective device on the body; The two ends of the hanging belt are respectively connected to the outer side walls of the carbon dioxide absorbent bin; Or, both ends of the hanging strap are respectively connected to the outer side walls of the oxygen supply device; Alternatively, two ends of the hanging strap are respectively connected to the outer side walls of the carbon dioxide absorbent bin and the oxygen supply device.

5. The isolated rebreathing protective device according to claim 4, characterized in that: The breathing apparatus includes a bite and a nose clip. The bite is connected to the first side of the carbon dioxide absorbent bin via a connecting cover. The base of the connecting cover is provided with a fold that can fold the base toward the carbon dioxide absorbent bin.

6. The isolated rebreathing protective device according to claim 5, characterized in that: The bite device is provided with a breathing port connected with the connecting cover, and the nose clip is provided with a sealing plug which can be inserted into and block the breathing port.

7. The isolated rebreathing protective device according to claim 1, characterized in that: The air bag is provided with a connection nozzle which is connected and communicated with the second side of the carbon dioxide absorbent bin; The oxygen supply device also includes a control valve arranged on the bottle mouth of the oxygen cylinder, the trigger switch is a trigger rod extending from the inside of the control valve to the outside of the control valve, the valve body of the control valve is provided with an air outlet for the trigger rod to extend, the aperture of the air outlet is larger than the diameter of the trigger rod, the first end of the trigger rod is located in the valve body, and the first end of the trigger rod is provided with a plug for blocking the air outlet, the second end of the trigger rod is located outside the valve body, and the second end of the trigger rod is provided with a baffle, the trigger rod is sleeved with a first spring that pushes the baffle to seal and block the air outlet, the first end of the first spring is elastically abutted against the baffle, the second end of the first spring is elastically abutted against the outer wall of the valve body, and the air outlet, the first end of the trigger rod and the baffle extend into the airbag.

8. The isolated rebreathing protective device according to claim 7, characterized in that: A partition is provided in the middle of the valve cavity of the valve body to divide the valve cavity into a first cavity and a second cavity, the valve body is also provided with a first gas inlet passage connecting the gas inlet of the valve body and the first cavity, the partition is provided with a second gas inlet passage connecting the first cavity and the second cavity, the first cavity is provided with a first piston which is movably disposed in the first cavity and can block the first gas inlet passage, and the second cavity is provided with a second piston which is movably disposed in the second cavity and can block the second gas inlet passage; A first air flow hole penetrating the first piston is provided in the first piston, a second air flow hole penetrating the second piston is provided in the second piston, a second spring for pushing the first piston to open the first air intake passage is sleeved on the first piston, and a third spring for pushing the second piston to open the second air intake passage is sleeved on the second piston.

9. The isolated rebreathing protective device according to claim 8, characterized in that: The first chamber is fixedly provided with a first sleeve on which the first end of the second spring can be sleeved, the second chamber is fixedly provided with a second sleeve on which the first end of the third spring can be sleeved, the first end of the first piston is sealed and inserted into the first sleeve, the first end outer wall of the first piston is provided with a first convex ring protruding from the outer wall of the first piston, the first convex ring abuts against the inner wall of the first sleeve, the first end of the second piston is sealed and inserted into the second sleeve, the first end outer wall of the second piston is provided with a second convex ring protruding from the outer wall of the second piston, the second convex ring abuts against the inner wall of the second sleeve; A third convex ring protruding from the outer wall of the first piston is provided on the outer wall of the second end of the first piston, and the third convex ring abuts against the inner wall of the first chamber; a fourth convex ring protruding from the outer wall of the second piston is provided on the outer wall of the second end of the second piston, and the fourth convex ring abuts against the inner wall of the second chamber; The first end aperture of the first air flow hole is smaller than the second end aperture of the first air flow hole, a first reduced diameter portion is provided in the middle of the first piston, the first end aperture of the second air flow hole is smaller than the second end aperture of the second air flow hole, and a second reduced diameter portion is provided in the middle of the second piston.

10. The isolated rebreathing protective device according to claim 9, characterized in that: At least one first washer is provided outside the first sleeve and located at the first end of the second spring, and at least one second washer is provided outside the second sleeve and located at the first end of the third spring; The valve body is also provided with a third pressure relief hole and a pressure relief assembly arranged in the third pressure relief hole. The third pressure relief hole is located on the side wall of the valve cavity between the second piston and the stopper. A accommodating cavity for accommodating the pressure relief assembly is provided in the middle of the third pressure relief hole. The aperture of the accommodating cavity is larger than the aperture of the third pressure relief hole. The pressure relief assembly includes a fourth spring and a sealing ball. The bottom end of the fourth spring elastically abuts against the bottom wall of the accommodating cavity, and the top end of the fourth spring abuts against the top end of the sealing ball and pushes the sealing ball to seal the third pressure relief hole.

Images