Circulating air supply type breathing device

Abstract

The utility model provides a circulating air supply type breathing device which comprises a main body of a closed structure, and the main body comprises an inspiration chamber, a carbon dioxide adsorber and an expiration chamber which are sequentially communicated with one another; an inspiration air bag capable of stretching out and drawing back in the axial direction of the inspiration cavity is arranged in the inspiration cavity, and an expiration air bag capable of stretching out and drawing back in the axial direction of the expiration cavity is arranged in the expiration cavity. The breathing mask is respectively communicated with the inspiration air bag and the expiration air bag through an inspiration pipeline and a breathing pipeline; the air supply port is communicated with the air suction air bag; and the one-way valves are arranged in the inspiration pipeline, the expiration pipeline, the bottom of the inspiration air bag, the bottom of the expiration air bag, the expiration cavity, the air supply port and between the carbon dioxide adsorber and the inspiration cavity. The breathing mask is simple in structure, low in cost and capable of recycling exhaled air and improving comfort and safety of operators.

Description

Technical Field

[0001] This utility model belongs to the field of respirators, and particularly relates to a circulating air supply breathing device for use in tunnel boring machines. Background Technology

[0002] When working in a high-pressure environment, breathing apparatus is an essential piece of equipment for workers to survive and work. The stability of breathing apparatus performance is related to the health of workers and the duration of work. Currently, most breathing apparatuses directly expel oxygen (or a mixture of gases) into the air after inhalation, which greatly reduces the utilization efficiency of gases (especially oxygen).

[0003] Chinese invention patent CN108969857B discloses a fully automatic oxygen inhalation and exhalation device, including an inspiratory regulator, an expiratory regulator, an inspiratory corrugated hose, an expiratory corrugated hose, a three-way valve, an oxygen mask, an oxygen supply valve assembly, an oxygen exhaust valve assembly, an inspiratory corrugated hose interface, and an expiratory corrugated hose interface; wherein the inspiratory regulator and the expiratory regulator are both horizontally placed cylindrical; the oxygen supply valve assembly is installed on the upper left side inside the inspiratory regulator, and the oxygen supply valve assembly is installed on the left side outside. It has an inspiratory bellows interface; an oxygen exhaust valve assembly is installed on the upper right side inside the expiratory regulator, and an expiratory bellows interface is installed on its outer right side; one end of the inspiratory bellows hose is connected to the inspiratory bellows interface, and the other end is connected to the left port of the three-way valve; one end of the expiratory bellows hose is connected to the expiratory bellows interface, and the other end is connected to the right port of the three-way valve, and the lower port of the three-way valve is connected to an oxygen mask; the upper part of the oxygen supply valve assembly is connected to the oxygen supply pipe, and the upper part of the oxygen exhaust valve assembly is connected to the exhaust pipe. When a person inhales oxygen through a mask, the oxygen supply system automatically adjusts to the patient's breathing rhythm during inhalation. Specifically, the valve seat of the oxygen supply valve assembly automatically opens in sync with the inhalation rhythm and adjusts the oxygen supply based on the volume of inhaled air. When inhalation stops, the valve seat automatically closes, stopping the oxygen supply. Similarly, during exhalation, the system automatically releases oxygen in sync with the inhalation rhythm. The oxygen release valve automatically opens in sync with the exhalation rhythm and adjusts the oxygen release based on the volume of exhaled air. When exhalation stops, the oxygen release valve automatically closes, stopping the oxygen release. On one hand, using an inspiratory regulator for patient oxygen supply saves three times the oxygen consumption compared to previous methods. On the other hand, the expiratory regulator prevents the extraction of gas from the room, reducing the operational load on the vacuum negative pressure system and minimizing its impact on room temperature and humidity. However, this method cannot recycle exhaled air, significantly reducing oxygen utilization efficiency.

[0004] Chinese invention patent application CN109078246A discloses an oxygen recycling oxygen inhalation device. The device includes a transparent headgear, a headgear fixing ring, a latex neck collar, an exhalation hose, a housing, an expander, a gas circulation pipe, a drain knob, a gas actuator, a dehumidifier, a carbon dioxide adsorber, a gas ejector, an auxiliary oxygen device, an oxygen pressure reducer, an oxygen flow regulating valve, and a return hose. The transparent headgear is cylindrical, sealed at the top, and connected to the latex neck collar at the bottom via the headgear fixing ring. The latex neck collar has an open bottom. One end of the exhalation hose is installed on the left side of the transparent headgear, and the other end is connected to the upper left side of the rectangular housing and then to the expander on the left side inside the housing. One end of the gas circulation pipe is connected to the bottom of the expander, and the other end is connected to... A gas actuator and dehumidifier are connected at the bottom of the chamber. The right side of the dehumidifier is connected to the bottom of the carbon dioxide adsorber located on the right side of the chamber via a gas circulation pipe. The bottom left side of the gas circulation pipe protrudes downwards, and a drain knob is installed on the protrusion at the lower outer side of the chamber. A gas jet is installed inside the carbon dioxide adsorber and extends to the top of the adsorber. An auxiliary oxygen device is located between the expander and the carbon dioxide adsorber. An oxygen regulating valve is connected to the upper outlet of the auxiliary oxygen device. An oxygen pressure reducer is installed on the upper part of the oxygen regulating valve. The outlet of the oxygen regulating valve is connected to the gas jet inside the carbon dioxide adsorber via a pipeline. One end of the return air hose is connected to the upper right side of the chamber and to the gas jet inside the chamber, and the other end is connected to the right side of the transparent hood. The dehumidifier is filled with aluminum oxide. Although this technology can recycle exhaled gas, its circulation uses a motor-assisted method. Because the flow rate of gas blown out by the motor is difficult to control, it can cause discomfort to the human body and affect the stability of waste gas treatment. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a circulating air supply breathing device, which aims to achieve gas recycling with a simple structure and improve the physical comfort of workers.

[0006] As one aspect of this utility model, a circulating air supply breathing device is provided, comprising:

[0007] The main body of the sealed structure includes an inhalation chamber and an exhalation chamber, and a carbon dioxide adsorber disposed between the inhalation chamber and the exhalation chamber, wherein the carbon dioxide adsorber is connected to the inhalation chamber and the exhalation chamber respectively; an inhalation airbag that can extend and retract along the axial direction of the inhalation chamber is provided in the inhalation chamber, and an exhalation airbag that can extend and retract along the axial direction of the exhalation chamber is provided in the exhalation chamber.

[0008] A breathing mask, wherein the breathing mask is connected to the inhalation bag and the exhalation bag via an inhalation tube and an exhalation tube, respectively;

[0009] An air supply port, which is connected to the inhalation airbag;

[0010] The inhalation pipe is equipped with a first one-way valve that allows gas to flow to the breathing mask; the exhalation pipe is equipped with a second one-way valve that allows gas to flow to the exhalation sac; the bottom of the inhalation sac is equipped with a third one-way valve that allows gas from the inhalation chamber to flow to the inhalation sac; the bottom of the exhalation sac is equipped with a fourth one-way valve that allows gas from inside the exhalation sac to flow to the exhalation chamber; the exhalation chamber is equipped with a fifth one-way valve that allows gas to flow from inside the chamber to outside; the air supply port is equipped with a sixth one-way valve that allows gas to flow to the inhalation sac; a seventh one-way valve is installed between the carbon dioxide adsorber and the inhalation chamber that allows gas to flow from the carbon dioxide adsorber into the inhalation chamber; and an eighth one-way valve is installed between the carbon dioxide adsorber and the exhalation chamber that allows gas to flow from the exhalation chamber into the carbon dioxide adsorber. The pressure threshold of the eighth one-way valve is lower than that of the fifth one-way valve.

[0011] As a preferred embodiment of the circulating air supply breathing device of this utility model, the main body of the sealed structure includes a frame and a cover. One end of the inhalation chamber and the expiration chamber has an opening, and the inhalation chamber and the expiration chamber are sealed by the cover covering the opening. The cover is provided with through holes for the inhalation pipe, the expiration pipe and the air supply port to pass through respectively.

[0012] As a preferred embodiment of the circulating air supply breathing device of this utility model, the pressure threshold of the eighth one-way valve is more than 0.2 bar lower than the pressure threshold of the fifth one-way valve, and further, 0.2-0.5 bar lower.

[0013] As a preferred embodiment of the circulating air supply breathing device of this utility model, the first one-way valve is located at the end of the inhalation pipe near the breathing mask.

[0014] As a preferred embodiment of the circulating air supply breathing device of this utility model, the second one-way valve is located at the end of the exhalation pipe near the exhalation bag.

[0015] As a preferred embodiment of the circulating air supply breathing device of this utility model, the fifth one-way valve is located at the bottom of the exhalation chamber.

[0016] As a preferred embodiment of the circulating air supply breathing device of this utility model, the device further includes a ninth one-way valve disposed at the end of the inhalation pipe near the inhalation bladder, which enables gas to flow to the breathing mask.

[0017] As a preferred embodiment of the circulating air supply breathing device of this utility model, the cover and the frame are sealed by bolt connection, and a sealing gasket is provided on the bolt.

[0018] As a preferred embodiment of the circulating air supply breathing device of this utility model, the carbon dioxide adsorber is detachably disposed within the main body.

[0019] As a preferred embodiment of the circulating air supply breathing device of this utility model, the tops of the inspiratory airbag and the expiratory airbag are respectively connected to the tops of the inspiratory chamber and the expiratory chamber, and extend along the axial direction of the chamber towards the bottom of the chamber. The connection method can be a fixed connection or a detachable connection.

[0020] It should be noted that, in the technical solution of this utility model, apart from the aforementioned relative threshold difference of the check valves, there is no particular limitation on the specific pressure threshold of each check valve. This can be achieved by those skilled in the art by selecting the common check valve pressure thresholds in the field based on the needs of gas conduction, the size of the device, and the working requirements.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The device of this utility model realizes the recycling of exhaled gas by mechanically utilizing the changes in air pressure in each chamber. It has a simple structure, and the above-mentioned circulation and internal pressure regulation can be achieved by setting a one-way valve. It is low in cost and does not require external energy supply.

[0023] 2. This utility model uses an airbag to provide cushioning, ensuring smooth and comfortable breathing for the human body, and also serves as a backup air reservoir for safe emergency actions. Attached Figure Description

[0024] Figure 1 A schematic diagram of one structure of the circulating air supply breathing device of this utility model;

[0025] Among them, 1-inhalation chamber, 2-carbon dioxide adsorber, 3-exhalation chamber, 4-inhalation bag, 5-exhalation bag, 6-breathing mask, 7-inhalation tubing, 8-exhalation tubing, 9-air inlet, 10-first one-way valve, 11-second one-way valve, 12-third one-way valve, 13-fourth one-way valve, 14-fifth one-way valve, 15-sixth one-way valve, 16-seventh one-way valve, 17-eighth one-way valve. Detailed Implementation

[0026] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] See Figure 1 One specific embodiment of this utility model provides a circulating air supply breathing device comprising:

[0028] The main body of the sealed structure includes an inhalation chamber 1 and an exhalation chamber 3, and a carbon dioxide adsorber 2 disposed between the inhalation chamber 1 and the exhalation chamber 3, wherein the carbon dioxide adsorber 2 is connected to the inhalation chamber 1 and the exhalation chamber 3 respectively; the inhalation chamber 1 is provided with an inhalation airbag 4 that can extend and retract along the axial direction of the inhalation chamber, and the exhalation chamber 2 is provided with an exhalation airbag 5 that can extend and retract along the axial direction of the exhalation chamber;

[0029] A breathing mask 6 is connected to the inhalation bag 4 and the exhalation bag 5 via an inhalation tube 7 and a breathing tube 8, respectively.

[0030] Air supply port 9, which is connected to the air intake bag 4, is used to deliver gas into the air intake bag for workers to inhale.

[0031] The inhalation conduit 7 is equipped with a first one-way valve 10 that allows gas to flow to the breathing mask 6; the exhalation conduit 8 is equipped with a second one-way valve 11 that allows gas to flow to the exhalation bag 5; the bottom of the inhalation bag 4 is equipped with a third one-way valve 12 that allows gas from the inhalation chamber 1 to flow to the inhalation bag 4; the bottom of the exhalation bag 5 is equipped with a fourth one-way valve 13 that allows gas inside the exhalation bag 5 to flow to the exhalation chamber 2; and the bottom of the exhalation chamber 3 is equipped with a fifth one-way valve that allows gas to flow from inside the chamber to outside the chamber. The gas supply port 9 is provided with a sixth one-way valve 15 for directing gas flow to the inhalation bladder 4. A seventh one-way valve 16 is provided between the carbon dioxide adsorber 2 and the inhalation chamber 1 for directing gas flow from the carbon dioxide adsorber 2 into the inhalation chamber 1. An eighth one-way valve 17 is provided between the carbon dioxide adsorber 2 and the exhalation chamber 3 for directing gas flow from the exhalation chamber 3 into the carbon dioxide adsorber 2. The pressure threshold of the eighth one-way valve 17 is lower than that of the fifth one-way valve 14.

[0032] The working principle of this device is as follows: During use, the gas (such as oxygen, compressed air, or a mixture of helium and oxygen) for the operator to inhale is delivered to the inhalation bag 4 through the air inlet 9. Under the action of air pressure, the inhalation bag 4 expands axially along the inhalation chamber 1, and the ventilated gas flows along the inhalation pipe toward the breathing mask. When the gas pressure in the inhalation pipe reaches the pressure threshold of the first one-way valve 10, the first one-way valve 10 is opened, and the gas enters the operator's body through the breathing mask. When the operator exhales, because the first one-way valve 10 is installed on the inhalation pipe, the gas can only flow along the exhalation pipe 3. Similarly, when the gas pressure in the exhalation pipe 3 reaches the pressure threshold of the second one-way valve 11, the second one-way valve 11 is opened. When the exhalation chamber 5 is open, gas enters the exhalation bag 5. Under the action of gas pressure, the exhalation bag 5 expands axially along the exhalation chamber 3. When the pressure inside the exhalation bag 5 reaches the pressure threshold of the fifth one-way valve 14, the fifth one-way valve 14 opens, and the exhaled gas enters the exhalation chamber 3. Because the pressure threshold of the eighth one-way valve 17 is greater than that of the fifth one-way valve 14, the eighth one-way valve 17 will open preferentially under the action of gas pressure. The exhaled gas enters the carbon dioxide adsorber for filtration, and then the filtered gas enters the inhalation chamber 1. When the gas pressure in the inhalation chamber 1 reaches the pressure threshold of the third one-way valve 12, the third one-way valve 12 opens, and the gas enters the inhalation bag 4 and mixes with the gas delivered by the air inlet 9, and then is circulated and inhaled by the operator. When the gas pressure in the inhalation chamber 1 is too high, the seventh one-way valve 16 will close. As the gas pressure in the exhalation chamber 3 further increases, the fifth one-way valve 14 opens, and the excess gas is discharged through the fifth one-way valve 14. In this invention, the two airbags are equivalent to two buffers. Their function is twofold: firstly, to buffer the delivered gas to improve the comfort of the operator's inhalation; secondly, to serve as a temporary gas storage chamber, which can act as an emergency gas source to ensure the operator's safety in taking emergency actions when the gas supply is cut off.

[0033] In another specific embodiment of this utility model, in order to better ensure that the eighth one-way valve 17 can be opened before the fifth one-way valve 14 to form an effective circulation of exhaled gas, the relationship between gas pressure and gas volume in the device is fully considered, and the pressure threshold of the eighth one-way valve 17 is set to be more than 0.2 bar lower than that of the fifth one-way valve 14. More preferably, it is more appropriate to be 0.2-0.5 bar lower.

[0034] In another specific embodiment of this utility model, in order to better ensure the smooth and stable delivery of gas, a first one-way valve 10 is located at the end of the inhalation pipe 7 near the breathing mask 6, and a second one-way valve 11 is located at the end of the exhalation pipe 8 near the exhalation bag 5. The device also includes a ninth one-way valve (not shown in the figure) disposed at the end of the inhalation pipe near the breathing bag, which allows gas to flow to the breathing mask.

[0035] In another specific embodiment of this utility model, the carbon dioxide adsorber is detachably installed inside the main body for easy replacement.

[0036] In another specific embodiment of this utility model, the tops of the inhalation airbag 4 and the exhalation airbag 5 are respectively connected to the tops of the inhalation chamber 1 and the exhalation chamber 3, and extend along the axial direction of the chamber towards the bottom of the chamber. The connection method can be a fixed connection or a detachable connection.

[0037] In another specific embodiment of this utility model, for ease of cleaning, the main body of the sealed structure includes a frame and a cover. The top of the inhalation chamber 4 and the exhalation chamber 5 have openings, and the inhalation chamber 4 and the exhalation chamber 5 are sealed and covered by the cover. The cover is provided with through holes for the inhalation pipe 7 and the exhalation pipe 11 to pass through respectively. The cover is fixed to the opening and seals the opening by bolts and sealing rings.

[0038] It should be noted that, based on the above embodiments of this utility model, those skilled in the art can fully realize the scope of the independent claims and dependent claims of this utility model, and the implementation process and methods are the same as those in the above embodiments; and the parts of this utility model not described in detail belong to the well-known technology in the art. However, the protection scope of this utility model is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A circulating air supply breathing device, characterized in that, include: The main body of the sealed structure includes an inhalation chamber, a carbon dioxide adsorber, and an exhalation chamber arranged in sequence; the inhalation chamber is provided with an inhalation airbag that can extend and retract along the axial direction of the inhalation chamber, and the exhalation chamber is provided with an exhalation airbag that can extend and retract along the axial direction of the exhalation chamber. A breathing mask, wherein the breathing mask is connected to the inhalation bag and the exhalation bag respectively through an inhalation tube and an exhalation tube; An air supply port, which is connected to the inhalation airbag; The inhalation pipe is equipped with a first one-way valve that allows gas to flow to the breathing mask; the exhalation pipe is equipped with a second one-way valve that allows gas to flow to the exhalation sac; the bottom of the inhalation sac is equipped with a third one-way valve that allows gas from the inhalation chamber to flow to the inhalation sac; the bottom of the exhalation sac is equipped with a fourth one-way valve that allows gas from inside the exhalation sac to flow to the exhalation chamber; the bottom of the exhalation chamber is equipped with a fifth one-way valve that allows gas to flow from inside the chamber to outside; the air supply port is equipped with a sixth one-way valve that allows gas to flow to the inhalation sac; a seventh one-way valve is installed between the carbon dioxide adsorber and the inhalation chamber that allows gas to flow from the carbon dioxide adsorber into the inhalation chamber; and an eighth one-way valve is installed between the carbon dioxide adsorber and the exhalation chamber that allows gas to flow from the exhalation chamber into the carbon dioxide adsorber. The pressure threshold of the eighth one-way valve is lower than that of the fifth one-way valve.

2. The circulating air supply breathing device as described in claim 1, characterized in that, The main body of the sealed structure includes a frame and a cover. One end of the inhalation chamber and the exhalation chamber has an opening, and the inhalation chamber and the exhalation chamber are sealed by the cover. The cover is provided with through holes for the inhalation pipe, the exhalation pipe and the air supply port to pass through respectively.

3. The circulating air supply breathing device as described in claim 1 or 2, characterized in that, The pressure threshold of the eighth check valve is 0.2-0.5 bar lower than that of the fifth check valve.

4. The circulating air supply breathing device as described in claim 1 or 2, characterized in that, The first one-way valve is located at the end of the inhalation tubing near the breathing mask, and the second one-way valve is located at the end of the exhalation tubing near the exhalation bag.

5. The circulating air supply breathing device as described in claim 1 or 2, characterized in that, The carbon dioxide adsorber is detachably installed within the main body.

6. The circulating air supply breathing device as described in claim 1 or 2, characterized in that, The device also includes a ninth one-way valve disposed at the end of the inhalation duct near the inhalation bladder, which allows gas to flow to the breathing mask.

7. The circulating air supply breathing device as described in claim 2, characterized in that, The cover is sealed to the frame by bolts, and the bolts are provided with sealing gaskets.

8. The circulating air supply breathing device as described in claim 1 or 2, characterized in that, The tops of the inspiratory and expiratory airbags are connected to the tops of the inspiratory and expiratory chambers, respectively, and extend along the axial direction of the chamber towards the bottom of the chamber. The connection can be a fixed connection or a detachable connection.

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