Single-closed-loop circulation respirator

Abstract

The utility model relates to the technical field of diving respirators, and discloses a single closed-loop circulation respirator which comprises a breathing mouthpiece, a carbon fiber machine body, a first air supply module, an external computer watch, a second air supply module and an integrated machine head, and the lower end of the integrated machine head is in threaded connection with a carbon dioxide adsorbent tank; through cooperation of the carbon fiber machine body, the first air supply module, the second air supply module, the integrated breathing air bag and the carbon dioxide adsorbent tank, simple structural design is adopted, the carbon fiber machine body is additionally arranged, the machine weight is greatly reduced, carrying is convenient, control is facilitated, the integrated breathing air bag has high strength and hydrolysis resistance, meanwhile, flexibility is not lost, and the service life of the machine is prolonged. And meanwhile, by pressing the adding valve on the first air supply module, pressing the gulp valve on the integrated machine head or the adding valve on the second air supply module, multiple air supply modes are combined with the actual situation to be practically applied, and one more layer of guarantee is provided for technical diving.

Description

TECHNICAL FIELD

[0001] The utility model relates to diving respirator technical field, concretely is single closed circuit breathing apparatus. BACKGROUND

[0002] The working principle of the circulating diving respirator is that the exhaled gas of the diver is absorbed by the carbon dioxide absorbent tank, and then enters the breathing circuit again for the diver to breathe. The oxygen cylinder and the carbon dioxide absorbent tank in the circulating diving respirator are designed separately, which is inconvenient to carry.

[0003] The circulating respirator in the prior art needs manual drainage when in use, most of which have no drainage function, and a small part can be manually drained, which increases the difficulty of underwater operation. At the same time, the existing circulating respirator usually adopts a double lung bag structure, which is relatively complex, so we need to propose a single closed circuit breathing apparatus. UTILITY MODEL CONTENT

[0004] The utility model discloses a single closed circuit breathing apparatus, has automatic drainage function, and simple structure adopts single artificial lung ring adsorption structure. The conventional flow hole / needle valve cannot accurately control the oxygen flow, and this machine can accurately control the oxygen supply amount at different depths to solve the problems in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: a single closed circuit breathing apparatus, comprising a breathing mouthpiece, a carbon fiber body, a first gas supply module, an external computer table, a second gas supply module and an integrated head, the lower end of the integrated head is threadedly connected with a carbon dioxide absorbent tank, the lower end of the carbon dioxide absorbent tank is clamped with a flow bowl cover, the flow bowl cover is threadedly connected with a screw rod, the both ends of the screw rod are respectively provided with an air inlet filter cover plate and an air outlet filter cover plate, the both ends of the screw rod are respectively provided with a first nut and a second nut for positioning the air inlet filter cover plate and the air outlet filter cover plate, the outer side of the carbon dioxide absorbent tank is provided with an integrated breathing air bag, the lower end of the integrated head is provided with a fixing ring for installing the integrated breathing air bag, the outer side of the integrated breathing air bag is provided with an adjustable stainless steel pipe clamp on the upper end, the carbon fiber body is sleeved on the outer side of the integrated breathing air bag, and the bottom of the integrated breathing air bag is provided with an exhaust valve.

[0006] A first air outlet medium pressure pipe is arranged on the first gas supply module, a second air outlet medium pressure pipe and a third air outlet medium pressure pipe are arranged on the second gas supply module, a waterproof line is arranged on the external computer table, and one end of the first air outlet medium pressure pipe, the second air outlet medium pressure pipe and the third air outlet medium pressure pipe is communicated with the upper end of the integrated head.

[0007] The integral head bottom is embedded with an oxygen probe cover, and three groups of oxygen probe bodies are threadedly connected in the oxygen probe cover.

[0008] Preferably, the first gas supply module is provided with a pure oxygen gas check valve, a dilution gas adding valve, a dilution gas check valve, a sequence needle valve and a pure oxygen gas adding valve, the pure oxygen gas check valve is provided with a first intake medium pressure pipe, one end of the first intake medium pressure pipe is provided with a first pressure reducer, and the intake end of the first pressure reducer is provided with a second gas cylinder.

[0009] Preferably, the second gas supply module is provided with a second intake medium pressure pipe, the third exhaust medium pressure pipe is installed on the second gas supply module away from the integral head, one end of the second intake medium pressure pipe is provided with a second pressure reducer, the intake end of the second pressure reducer is provided with a first gas cylinder, the first gas cylinder and the second gas cylinder are installed on the two sides of the carbon fiber body respectively, and the bottom of the carbon fiber body is provided with a base.

[0010] Preferably, the integral head is provided with a gas supplement valve in communication with the second exhaust medium pressure pipe, the outer side of the carbon fiber body is provided with a through hole for pressing the gas supplement valve, and the gas supplement valve is arranged in the integral breathing gas bag.

[0011] Preferably, the intake end of the breathing mouthpiece is communicated with a suction hose, the exhaust end of the breathing mouthpiece is communicated with an exhaust hose, the intake end and the exhaust end of the breathing mouthpiece are respectively provided with a suction one-way valve and an exhaust one-way valve, and the end of the suction hose away from the breathing mouthpiece and the end of the exhaust hose away from the breathing mouthpiece are both provided with a bending type pipe fitting.

[0012] Preferably, the integral head is provided with a lower hole in communication with the suction hose, and a interlayer in communication with the lower hole is arranged between the carbon dioxide adsorbent tank and the integral breathing gas bag.

[0013] Preferably, the integral head is provided with a through hole for connecting the exhaust hose and the inner cavity of the carbon dioxide adsorbent tank, the intake filter cover plate and the exhaust filter cover plate are filled with carbon dioxide adsorbent, the flow guide bowl cover is conical, and the bottom of the flow guide bowl cover is provided with a bottom hole in communication with the interlayer.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. This utility model mainly utilizes the combination of a carbon fiber body, a first air supply module, a second air supply module, an integrated breathing bag, and a carbon dioxide adsorbent tank. It employs a simplified structural design, and the carbon fiber body significantly reduces the machine's weight, making it easy to carry and operate. Furthermore, the integrated breathing bag possesses high strength and hydrolysis resistance while maintaining flexibility, minimizing breathing resistance. Simultaneously, multiple air replenishment methods—such as pressing the add valve on the first air supply module, pressing the replenishment valve on the integrated head, or pressing the add valve on the second air supply module—combined with practical applications, provide an extra layer of protection for technical diving.

[0016] 2. Through the cooperation between the flow guide bowl cover and the air replenishment valve, the structure of the flow guide bowl cover and the integrated breathing air bag can achieve the water storage function. Combined with the automatic opening and closing of the exhaust valve, the machine can realize its unique automatic drainage function. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall bottom view of the present invention;

[0018] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the external computer display structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the first gas supply module of this utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the first gas supply module of this utility model;

[0022] Figure 6 This is a schematic diagram of the oxygen probe cover structure of this utility model;

[0023] Figure 7 This is a schematic diagram of the oxygen probe body structure of this utility model;

[0024] Figure 8 This is a schematic diagram of the air replenishment valve structure of this utility model;

[0025] Figure 9 This is a schematic diagram of the flow guide bowl cover structure of this utility model;

[0026] Figure 10 This is a schematic diagram of the screw structure of this utility model.

[0027] Figure 11 This is a schematic diagram of the air outlet filter cover of this utility model.

[0028] In the diagram: 1. Breathing mouthpiece; 2. Inhalation hose; 3. Exhalation hose; 4. Carbon fiber body; 5. First gas cylinder; 6. Second gas cylinder; 7. First gas supply module; 71. Pure oxygen gas check valve; 72. Dilute gas add valve; 73. Dilute gas check valve; 74. Sequential needle valve; 75. Pure oxygen gas add valve; 8. External computer; 9. First inlet medium-pressure hose; 10. First outlet medium-pressure hose; 11. Waterproof line; 12. Second inlet medium-pressure hose; 13. Second outlet medium-pressure hose; 14. Third outlet... 15. Medium-pressure hose; 16. Secondary air supply module; 17. Primary pressure reducer one; 18. Exhaust valve; 19. Base; 20. Primary pressure reducer two; 21. Integrated head; 22. Fixing collar; 23. Integrated breathing bag; 24. Carbon dioxide adsorbent canister; 25. Flow guide cup cover; 26. First nut; 27. Inlet filter cover; 28. Screw; 29. ​​Outlet filter cover; 30. Second nut; 31. Make-up valve; 32. Oxygen probe cover; 33. Oxygen probe body; 34. Adjustable stainless steel hose clamp. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-11 This utility model provides a technical solution: a single closed-circuit respirator, including a mouthpiece 1, a carbon fiber body 4, a first air supply module 7, an external computer 8, a second air supply module 15, and an integrated head 20. A carbon dioxide adsorbent canister 23 is threadedly connected to the lower end of the integrated head 20. A flow guide cup cover 24 is snapped onto the lower end of the carbon dioxide adsorbent canister 23. A screw 27 is threadedly connected to the flow guide cup cover 24. An inlet filter cover 26 and an outlet filter cover 28 are respectively installed at both ends of the screw 27. The end is respectively provided with a first nut 25 and a second nut 29 for positioning the inlet filter cover 26 and the outlet filter cover 28. An integrated breathing bag 22 is provided on the outside of the carbon dioxide adsorbent tank 23. A fixing collar 21 for installing the integrated breathing bag 22 is provided at the lower end of the integrated machine head 20. An adjustable stainless steel pipe clamp 33 is provided at the upper outer end of the integrated breathing bag 22. The carbon fiber machine body 4 is sleeved on the outside of the integrated breathing bag 22. An exhaust valve 17 is provided at the bottom of the integrated breathing bag 22.

[0031] The first air supply module 7 is equipped with a first air outlet medium pressure pipe 10, the second air supply module 15 is equipped with a second air outlet medium pressure pipe 13 and a third air outlet medium pressure pipe 14, the external computer meter 8 is equipped with a waterproof line 11, and one end of the first air outlet medium pressure pipe 10, the second air outlet medium pressure pipe 13 and the third air outlet medium pressure pipe 14 are all connected to the upper end of the integrated machine head 20.

[0032] The bottom of the integrated head 20 is fitted with an oxygen probe cover 31. Three sets of oxygen probe bodies 32 are connected to the internal threads of the oxygen probe cover 31. The oxygen probe cover 31 has three first holes corresponding to the threads of the oxygen probe bodies 32. The three oxygen probe bodies 32 can be installed inside the oxygen probe head cover 31 by means of threads. The bottom of each oxygen probe body 32 is equipped with a waterproof sealing ring, which can effectively isolate water vapor.

[0033] The first gas supply module 7 is equipped with a pure oxygen gas check valve 71, a dilution gas adding valve 72, a dilution gas check valve 73, a sequential needle valve 74, and a pure oxygen gas adding valve 75. The pure oxygen gas check valve 71 is equipped with a first inlet medium pressure pipe 9. One end of the first inlet medium pressure pipe 9 is equipped with a first-stage pressure reducer 16. The inlet end of the first-stage pressure reducer 16 is equipped with a second gas cylinder 6.

[0034] The sequential needle valve 74 includes a knob cover, a spring and a bullet head embedded in the knob cover, a needle valve, and a stop plate (not shown in the figure). The bullet head accessory is fitted into the knob cover with the spring, and then the knob cover and the stop plate are fixed with an Allen screw. The stop plate has 12 holes, corresponding to the initial position and positions 1 to 11 of the needle valve. In the initial position, the bullet head is located in a set of holes on the stop plate. Gently rotate the knob cover counterclockwise. When you feel a locking sensation, the bullet head inside the knob cover has moved to the stop position. At the position of the hole below the position plate, the needle valve is now in the first gear position. The needle valve changes from its initial position to the first gear position. The hexagonal groove inside the knob cover drives the needle valve core to rotate counterclockwise. The core is threadedly connected to the needle valve housing, causing the core to move outwards from the first air supply module 7. This increases the gap between the needle valve and the conical groove inside the first air supply module 7, thus increasing the gas flow rate. In the first gear position, the gas flow rate is 0.4 L / min, an increase of 0.2 L / min from the initial position. Each subsequent gear position increases the gas flow rate sequentially by 0.2 L / min, continuing until the maximum 11th gear position, where the gas flow rate is 2.6 L / min.

[0035] Therefore, the sequential needle valve 74 has 11 levels, each capable of sequentially increasing the gas flow rate by 0.2L / min, with the default medium pressure of the external gas cylinder being 13 bar and the initial gas flow rate being 0.2L / min. The maximum gas flow rate can reach 2.6L / min.

[0036] It should be noted that, based on calculations, under the condition that the default medium pressure of the external gas cylinder is 13 bar, the measured gas flow rate through the initial position of the sequential needle valve 74 is 0.2 L / min.

[0037] The needle core inside the sequential needle valve 74 has a micro-conical design. Pure oxygen gas enters the sequential needle valve 74 through the gap at this point, and then flows out of the sequential needle valve 74 through the holes on the sequential needle valve 74.

[0038] The pure oxygen gas adding valve 75 has two second holes, one at the top and one at the bottom. Gas from the inlet enters the pure oxygen gas adding valve 75 through these second holes. When the round cover on the outside of the pure oxygen gas adding valve 75 is pressed, the round cover and the inner core of the pure oxygen gas adding valve 75 are pushed outward by the force of a spring, creating a gap inside the pure oxygen gas adding valve 75. Pure oxygen flows through this gap to the outside of the pure oxygen gas adding valve 75. After the gas flows to the outside of the pure oxygen gas adding valve 75, it enters the first outlet medium-pressure pipe 10 through the outlet for human respiration. If the gas flow from the sequential needle valve 74 is insufficient, or if the oxygen demand increases during physical labor, a large flow of oxygen can be supplied instantaneously as needed by pressing the round cover on the outside of the pure oxygen gas adding valve 75.

[0039] The second air supply module 15 is equipped with a second air inlet medium pressure pipe 12, and the end of the third air outlet medium pressure pipe 14 away from the integrated machine head 20 is installed on the second air supply module 15. One end of the second air inlet medium pressure pipe 12 is provided with a first-stage pressure reducer 19. The air inlet end of the first-stage pressure reducer 19 is provided with a first gas cylinder 5. The first gas cylinder 5 and the second gas cylinder 6 are respectively installed on both sides of the carbon fiber body 4. The bottom of the carbon fiber body 4 is equipped with a base 18.

[0040] The principle of the dilution gas adding valve 72 is the same as that of the pure oxygen gas adding valve 75 mentioned above, which generates a large flow of gas instantaneously by pressing.

[0041] The integrated head unit 20 is equipped with a supplementary air valve 30 that communicates with the second outlet medium-pressure pipe 13. A through hole is provided on the outer side of the carbon fiber body 4 for pressing the lever of the supplementary air valve 30. The supplementary air valve 30 is located inside the integrated breathing bag 22. The supplementary air valve 30 mainly consists of a nut, a lever, and a lever. The lever head is bullet-shaped, and the nut has a hollow internal structure. The lever is inserted into the nut from tail to head. A limiting layer inside the nut can fix the lever position. The nut and lever assembly is then threaded into the corresponding hole in the integrated head unit 20. A waterproof sealing ring is installed next to the nut. The bottom of the lever has a third hole corresponding to the lever. After the lever is inserted into the lever at a certain position, the lever and lever are fixed by screwing in the hexagonal screw through the side hole. Due to the air pressure, the bottom surface of the bullet part inside the air supply valve 30 and the inner plane of the nut form a sealing surface. The diver presses the lever of the air supply valve 30 from the outside through the integrated breathing bag 22. The lever moves the lever, and the lever rotates the bullet part, thereby creating a gap gas passage. The diluted gas flows through the gap to the machine's interlayer. When the diver inhales, it can be supplied with air through the breathing hose 2 and the breathing mouthpiece 1.

[0042] Meanwhile, the second gas supply module 15 is equipped with an addition valve for adding dilution gas. By pressing the addition valve, the dilution gas is introduced into the integrated head 20 through the third outlet medium pressure pipe 14, which facilitates the mixing of oxygen and dilution gas and makes it convenient for divers to breathe.

[0043] The inlet end of the breathing mouthpiece 1 is connected to the inhalation hose 2, and the outlet end of the breathing mouthpiece 1 is connected to the exhalation hose 3. The inhalation and exhalation one-way valves are respectively provided at the inhalation and exhalation ends of the breathing mouthpiece 1. Both the end of the inhalation hose 2 away from the breathing mouthpiece 1 and the end of the exhalation hose 3 away from the breathing mouthpiece 1 are provided with a bent tube. The integrated head 20 is provided with a threaded tube that is threaded to the bent tube. Oxygen flows into the breathing mouthpiece 1 through the inhalation hose 2 for the diver to use. The carbon dioxide exhaled by the diver is introduced into the carbon dioxide adsorbent tank 23 inside the machine through the exhalation hose 3. The filtered gas is mixed with the gas that enters the middle layer of the machine from the first air supply module 7 and the second air supply module 15 and continues to be used by the diver. This is cyclic breathing.

[0044] The integrated head unit 20 is provided with a lower hole that is connected to the inhalation hose 2. A sandwich layer connected to the lower hole is formed between the carbon dioxide adsorbent tank 23 and the integrated breathing bag 22. The gas in the sandwich layer is supplied to the diver through the lower hole.

[0045] The integrated head 20 has a connecting hole for connecting the exhalation hose 3 and the inner cavity of the carbon dioxide adsorbent canister 23. The space between the inlet filter cover 26 and the outlet filter cover 28 is filled with carbon dioxide adsorbent. The flow guide cover 24 is conical, and the bottom of the flow guide cover 24 has a bottom hole that communicates with the interlayer. If the gas in the integrated breathing bag 22 is overloaded, the exhaust valve 17 will automatically open to discharge the excess gas to the outside of the machine, which can prevent the integrated breathing bag 22 from expanding and rupturing. At the same time, the external valve of the exhaust valve 17 can also be manually pressed to manually discharge gas.

[0046] In the event of water ingress into the machine during use, specifically through the breathing mouthpiece 1, the diver can exhale directly to expel the water into the exhalation hose 3. The water then flows through the integrated head 20, inlet filter cover 26, carbon dioxide adsorbent tank 23, and outlet filter cover 28 into the flow guide cover 24. The flow guide cover 24 collects the water to prevent it from flowing back into the carbon dioxide adsorbent tank 23. The collected water then enters the bottom of the integrated breathing bag 22 through the hole at the bottom of the flow guide cover 24 and flows from the built-in vent cap of the exhaust valve 17 to the external valve. Since the exhaust valve 17 automatically opens when the diver exhales, the water will be discharged outside the machine through the external valve. This is the machine's automatic drainage function, which prevents the machine from being submerged and causing diving accidents. The carbon dioxide adsorbent can still be used even when exposed to water, although its lifespan will be affected.

[0047] Another scenario is that when the carbon dioxide adsorbent absorbs carbon dioxide gas, a chemical reaction occurs, generating heat and water. The generated water flows to the guide bowl cover 24, so the water generated inside the machine can also be automatically discharged to the outside of the machine through the exhaust valve 17.

[0048] Three oxygen probes mounted on the oxygen probe cover 31 are used to detect the oxygen content inside the machine. The hole connecting the waterproof line 11 to the integrated machine head 20 leads directly into the oxygen probe chamber. One end of the waterproof line 11 that connects to the inside of the machine has three wires and three plugs, which correspond to the three oxygen probe sockets in the oxygen probe chamber. The other end of the waterproof line 11 is connected to the external computer meter 8. The cable inside the waterproof line 11 can transmit oxygen data to the external computer meter 8. The external computer meter 8 can calculate the oxygen partial pressure value through a set algorithm.

[0049] When the oxygen partial pressure displayed on the external computer 8 is too high, or when it is necessary to dive to a deeper depth, the gas check valve under the first air supply module 7 can be connected to an external gas cylinder containing dilution gas. Pressing the corresponding round cap can instantly replenish a large amount of dilution gas into the middle layer of the machine, reducing the oxygen partial pressure to a normal value. Maintaining a normal oxygen partial pressure is crucial for underwater respirators. At the same time, the gas addition valve on the second air supply module 15 or the air replenishment valve 30 in the integrated head 20 can be pressed to allow the second air supply module 15 to replenish dilution gas into the machine (the second air supply module 15 is connected to a dilution gas cylinder by default).

[0050] Conversely, if the oxygen partial pressure value of the external computer gauge 8 is too low, the round cover on the first gas supply module 7 can be pressed to instantly replenish a large amount of pure oxygen gas, thereby increasing the oxygen partial pressure and maintaining it at a normal value.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single closed-circuit respirator, comprising a mouthpiece (1), a carbon fiber body (4), a first air supply module (7), an external computer (8), a second air supply module (15), and an integrated head unit (20), characterized in that: The lower end of the integrated head (20) is threadedly connected to a carbon dioxide adsorbent tank (23). The lower end of the carbon dioxide adsorbent tank (23) is snapped with a flow guide cup cover (24). A screw (27) is threadedly connected to the flow guide cup cover (24). An inlet filter cover (26) and an outlet filter cover (28) are respectively installed at both ends of the screw (27). A first nut (25) for positioning the inlet filter cover (26) and the outlet filter cover (28) are respectively provided at both ends of the screw (27). The second nut (29), an integrated breathing bag (22) is provided on the outside of the carbon dioxide adsorbent tank (23), a fixing collar (21) for installing the integrated breathing bag (22) is provided at the lower end of the integrated head (20), an adjustable stainless steel pipe clamp (33) is provided at the upper outside of the integrated breathing bag (22), the carbon fiber body (4) is sleeved on the outside of the integrated breathing bag (22), and an exhaust valve (17) is provided at the bottom of the integrated breathing bag (22). The first gas supply module (7) is provided with a first gas outlet medium pressure pipe (10), the second gas supply module (15) is provided with a second gas outlet medium pressure pipe (13) and a third gas outlet medium pressure pipe (14), the external computer meter (8) is provided with a waterproof line (11), and one end of the first gas outlet medium pressure pipe (10), the second gas outlet medium pressure pipe (13) and the third gas outlet medium pressure pipe (14) are all connected to the upper end of the integrated machine head (20); The bottom of the integrated head (20) is fitted with an oxygen probe cover (31), and the oxygen probe cover (31) is internally threaded with three sets of oxygen probe bodies (32).

2. The single closed-circuit respirator according to claim 1, characterized in that: The first gas supply module (7) is equipped with a pure oxygen gas check valve (71), a dilution gas adding valve (72), a dilution gas check valve (73), a sequential needle valve (74), and a pure oxygen gas adding valve (75). The pure oxygen gas check valve (71) is equipped with a first inlet medium pressure pipe (9). One end of the first inlet medium pressure pipe (9) is equipped with a first-stage pressure reducer (16). The inlet end of the first-stage pressure reducer (16) is equipped with a second gas cylinder (6).

3. The single closed-circuit respirator according to claim 2, characterized in that: The second air supply module (15) is equipped with a second air inlet medium pressure pipe (12). The end of the third air outlet medium pressure pipe (14) away from the integrated machine head (20) is installed on the second air supply module (15). One end of the second air inlet medium pressure pipe (12) is provided with a first-stage pressure reducer (19). The air inlet end of the first-stage pressure reducer (19) is provided with a first gas cylinder (5). The first gas cylinder (5) and the second gas cylinder (6) are respectively installed on both sides of the carbon fiber body (4). The bottom of the carbon fiber body (4) is equipped with a base (18).

4. The single closed-circuit respirator according to claim 3, characterized in that: The integrated head (20) is equipped with a supplementary air valve (30) that is connected to the second outlet medium pressure pipe (13). The outer side of the carbon fiber body (4) is provided with a through hole for pressing the paddle of the supplementary air valve (30). The supplementary air valve (30) is located inside the integrated breathing bag (22).

5. The single closed-circuit respirator according to claim 4, characterized in that: The inlet end of the breathing mouthpiece (1) is connected to an inhalation hose (2), and the outlet end of the breathing mouthpiece (1) is connected to an exhalation hose (3). The inlet end and outlet end of the breathing mouthpiece (1) are respectively equipped with an inhalation check valve and an exhalation check valve. The end of the inhalation hose (2) away from the breathing mouthpiece (1) and the end of the exhalation hose (3) away from the breathing mouthpiece (1) are both equipped with a bent tube. The integrated head (20) is equipped with a threaded tube that is threadedly connected to the bent tube.

6. The single closed-circuit respirator according to claim 5, characterized in that: The integrated head (20) is provided with a lower hole that communicates with the inhalation hose (2), and an interlayer that communicates with the lower hole is provided between the carbon dioxide adsorbent tank (23) and the integrated breathing bag (22).

7. The single closed-circuit respirator according to claim 6, characterized in that: The integrated head (20) is provided with a connecting hole for connecting the exhalation hose (3) and the inner cavity of the carbon dioxide adsorbent canister (23). The air inlet filter cover (26) and the air outlet filter cover (28) are filled with carbon dioxide adsorbent. The flow guide cup cover (24) is conical and has a bottom hole at the bottom that communicates with the interlayer.

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