A lightweight underwater circulation breathing apparatus

Abstract

The present invention discloses a lightweight underwater circulation breathing apparatus, which includes a lung bag. An oxygen cylinder is provided on the lung bag, and a cylinder valve is installed at the air outlet end of the oxygen cylinder. The cylinder valve is connected to an oxygen pressure reducing valve. The oxygen pressure reducing valve has two medium-pressure air outlet ports. One of the medium-pressure air outlet ports is communicated with the lung bag, and the other medium-pressure air outlet port is connected to an oxygen supply hose. The other end of the oxygen supply hose is connected to an automatic supply and demand valve. An absorbent tank is also provided on the lung bag. An air intake pipe and an exhalation pipe are installed on the absorbent tank. The other ends of the air intake pipe and the exhalation pipe are connected through a breathing valve box, and a mouthpiece is provided on the breathing valve box. An exhaust valve is also provided on the absorbent tank. The present invention has a long service time, high oxygen utilization rate, and almost no bubbles during use. It has a small volume, light weight, is convenient to carry, has a high degree of integration, and is convenient for maintenance and repair.

Description

Technical Field

[0001] The present invention relates to the field of diving equipment, and particularly to a lightweight underwater circulation breathing apparatus. Background Art

[0002] An underwater breathing apparatus is a life support device for divers to work underwater for a long time, which is necessary to ensure the safe breathing of divers underwater and carry out various operations.

[0003] Currently, open diving equipment is mainly used for shallow-depth diving. After the air is breathed by the human body, it is directly discharged. During the process of human breathing metabolism, the oxygen utilization rate is relatively low, resulting in a large amount of oxygen being wasted. The open diving equipment is relatively heavy and has a short usage time. Summary of the Invention

[0004] Aiming at the above deficiencies of the prior art, the technical problem to be solved by the present invention is: to provide a lightweight underwater circulation breathing apparatus with a long usage time, high oxygen utilization rate, and almost no bubbles during use. It has a small volume, light weight, is easy to carry, has a high degree of integration, and is convenient for maintenance.

[0005] To solve the above technical problem, the present invention adopts the following technical solution:

[0006] A lightweight underwater circulation breathing apparatus includes a lung bag. An oxygen cylinder is provided on the lung bag, and a cylinder valve is installed at the air outlet end of the oxygen cylinder. The cylinder valve is connected to an oxygen pressure reducing valve. The oxygen pressure reducing valve has two medium-pressure air outlet ports. One of the medium-pressure air outlet ports is communicated with the lung bag, and the other medium-pressure air outlet port is connected to one end of an oxygen supply hose. The other end of the oxygen supply hose is connected to the intake end of an automatic supply and demand valve provided on the lung bag. The air outlet end of the automatic supply and demand valve is communicated with the lung bag; An absorbent tank is also provided on the lung bag, and the absorbent tank is communicated with the lung bag; An air intake pipe and an exhalation pipe are installed on the absorbent tank. One end of the air intake pipe penetrates through the absorbent tank and is communicated with the lung bag, and the other end is connected to the air intake joint of a breathing valve box. One end of the exhalation pipe is communicated with the absorbent tank, and the other end is connected to the exhalation joint of the breathing valve box. The breathing valve box has a mouthpiece; An exhaust valve is also provided on the absorbent tank, and the exhaust valve is communicated with the absorbent tank.

[0007] As an optimization, the oxygen pressure reducing valve includes an air inlet joint, a pressure reducing valve body, and a pressure reducing valve cover that are connected in sequence; the air inlet end of the air inlet joint is connected to the gas cylinder valve, a pressure reducing valve cavity is formed between the pressure reducing valve body and the pressure reducing valve cover, and an air inlet channel that connects the air inlet joint and the pressure reducing valve cavity is provided on the pressure reducing valve body; a pressure reducing piston is slidably fitted in the pressure reducing valve cavity, one end of the pressure reducing piston faces the air inlet channel of the pressure reducing valve cavity, and the other end is provided with a pressure reducing valve disc, the pressure reducing valve disc is slidably fitted and connected to the pressure reducing valve body, a pressure reducing spring is provided between the pressure reducing valve disc and the pressure reducing valve body, under the action of the pressure reducing spring, the end of the pressure reducing piston can close the air inlet channel of the pressure reducing valve cavity, and there is a gap between the pressure reducing valve disc and the pressure reducing valve cover; a pressure reducing air passage is provided axially in the pressure reducing piston, the pressure reducing air passage penetrates the pressure reducing valve disc, and a pressure reducing air inlet hole that communicates with the pressure reducing air passage is provided on the side wall of the pressure reducing piston; the two medium-pressure air outlet ports are provided on the pressure reducing valve cover, and the medium-pressure air outlet ports communicate with the gap between the pressure reducing valve disc and the pressure reducing valve cover; a constant-flow oxygen nozzle is installed on the medium-pressure air outlet port connected to the lung bag.

[0008] As an optimization, a high-pressure gauge joint is further provided on the pressure reducing valve body, the air inlet end of the high-pressure gauge joint communicates with the air outlet end of the air inlet joint through a connecting air passage, and its air outlet end is connected to a high-pressure gauge.

[0009] As an optimization, the automatic supply and demand valve includes a supply and demand valve body, a supply and demand valve cover, a transmission diaphragm, an outer cover and a balance pipe. The supply and demand valve body is located inside the lung bag and is a tubular structure. The supply and demand valve cover is annular and connected to one end of the supply and demand valve body. The supply and demand valve cover passes through the lung bag and is connected to the outer cover. The middle part of the outer cover is a flexible cushion. The balance pipe is close to the other end of the supply and demand valve body and runs through the opposite sides of the supply and demand valve body. The transmission diaphragm is located inside the supply and demand valve body and the balance pipe is connected to the outer cover. The balance tube is separated from the outer cover, and the middle part of the transmission diaphragm is raised toward the outer cover and fits with the pad; a supply and demand valve seat is arranged in the balance tube, and the supply and demand valve seat is close to one end of the balance tube, and a through hole is arranged in the middle thereof; the end of the balance tube close to the supply and demand valve seat forms an air inlet end, and the air inlet end is connected to the end of the oxygen supply hose away from the oxygen pressure reducing valve; a supply and demand piston rod and a balance seat are slidingly arranged in the balance tube, and the supply and demand piston rod is located between the balance seat and the supply and demand valve seat, and a supply and demand piston rod is arranged on the supply and demand piston rod The plug disk, wherein the supply and demand piston rod is connected with the balancing tube by sliding cooperation through the supply and demand piston disk, and a supply and demand spring is arranged between the supply and demand piston disk and the balancing seat, and under the action of the supply and demand spring, the supply and demand piston rod can close the through hole of the supply and demand valve seat; a fixing nut is arranged at the other end of the balancing tube, and an adjusting screw is threadedly connected in the fixing nut, and the adjusting screw abuts against the balancing seat and can drive the balancing seat to move in the balancing tube; an arch rod is also arranged on the balancing tube, one end of the arch rod extends into the balancing tube and is movably connected with the supply and demand piston rod, and the arch rod is rotatably connected with the balancing tube, and the other end of the arch rod extends to fit with the raised portion of the transmission diaphragm. When the pressing pad squeezes the raised portion of the transmission diaphragm, the transmission diaphragm can drive the arch rod to move toward the air inlet end of the balancing tube, and drive the supply and demand piston rod to compress the supply and demand spring, so that the through hole of the supply and demand valve seat is opened; an air outlet hole connected with the supply and demand valve body is also arranged on the balancing tube, and the air outlet hole is located on the side of the supply and demand valve seat away from the oxygen supply hose.

[0010] As an optimization, the absorbent tank includes a tank body arranged inside the lung bag and a tank cover arranged outside the lung bag, and an air hole communicating with the lung bag is provided at the bottom of the tank body; an absorbent layer is provided in the tank body, and a water-absorbing sponge layer is laid between the absorbent layer, the tank cover and the bottom of the tank body.

[0011] As an optimization, an exhalation valve seat and an inhalation valve seat are respectively provided at both ends of the breathing valve box, and a breathing diaphragm is provided on the exhalation valve seat and the inhalation valve seat; the inhalation valve seat is connected to the inhalation pipe, and the exhalation valve seat is connected to the exhalation pipe, the mouthpiece is arranged on one side of the breathing valve box, and the inhalation pipe, the exhalation pipe and the mouthpiece are all communicated with the breathing valve box.

[0012] As an optimization, the breathing valve box is of a tubular structure, and an inner sleeve is rotatably connected in the breathing valve cavity, and the inner sleeve is in close contact with the breathing valve box. A vent hole is provided on the inner sleeve at a position opposite to the mouthpiece, and a lever is provided on the side wall of the inner sleeve away from the vent hole. Correspondingly, an adjustment hole extending along the circumference of the breathing valve seat is provided on the side wall, and the lever passes through the adjustment hole and is slidably connected to the adjustment hole.

[0013] As an optimization, the exhaust valve includes an exhaust valve body, the exhaust valve body has air passages running through both ends thereof, a one-way diaphragm is provided at the air inlet end of the exhaust valve body, when the one-way diaphragm is opened, gas can enter the air passage from the air inlet end; a slide groove is provided around the end face of the air outlet end of the valve body, a sliding nut is provided in the slide groove for sliding fit, the sliding nut is connected with the inner wall of the slide groove for sliding fit, and there is a spacing between the sliding nut and the outer wall of the slide groove, and a return spring is provided between the sliding nut and the bottom of the slide groove; an exhaust valve cover is detachably connected to the sliding nut An exhaust valve seat is provided between the exhaust valve cover and the one-way diaphragm, and a compression spring is provided between the exhaust valve seat and the exhaust valve cover; the exhaust valve seat has an outwardly folded flange at one end close to the exhaust valve cover, and an exhaust diaphragm is provided between the flange and the sliding nut. Under the action of the return spring and the compression spring, the sliding nut cooperates with the flange of the exhaust valve seat to clamp the exhaust diaphragm and close the airway of the exhaust valve body; an exhaust hole is provided on the exhaust valve cover, and when there is a gap between the flange of the exhaust valve seat and the exhaust diaphragm, the airway of the exhaust valve body is connected with the exhaust hole through the gap.

[0014] As an optimization, a cylindrical fixed seat is provided in the exhaust valve body, and the fixed seat is fixedly connected to the exhaust valve body, with its open end facing the exhaust valve cover. The one-way diaphragm is arranged in the fixed seat and connected with the closed end of the fixed seat in a sliding fit. A plurality of air holes are also provided at the closed end of the fixed seat; the exhaust valve seat is slidingly arranged in the fixed seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention uses oxygen as the gas source and is used at a depth of less than 7 meters. The respirator adopts a circulating breathing circuit. When using it, the diver inhales pure oxygen and exhales a mixed gas containing about 4% carbon dioxide and oxygen after metabolism by the human body. The mixed gas passes through the absorbent tank to absorb the carbon dioxide and becomes clean oxygen again, then re-enters the lung bag and re-enters the inhalation pipeline for human breathing. The air supply system is integrated on the lung bag, and the medium-pressure air supply pipeline is installed in the lung bag, which reduces the external pipelines, making the equipment more compact and 40% lighter than similar underwater rebreathers. It has a long service life, high oxygen utilization rate, and almost no bubbles during use. It is small in size, light in weight, easy to carry, highly integrated, and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the structural schematic diagram of the present invention;

[0018] Figure 2 is the structural schematic diagram of the oxygen pressure reducing valve in the present invention;

[0019] Figure 3 is the structural schematic diagram of the automatic supply and demand valve in the present invention;

[0020] Figure 4 is the front view structural schematic diagram of the absorbent tank in the present invention;

[0021] Figure 5 is Figure 4 the sectional structural schematic diagram of;

[0022] Figure 6 is the structural schematic diagram of the breathing valve box in the present invention;

[0023] Figure 7 is the structural schematic diagram of the exhaust valve in the present invention;

[0024] In the figure, 1 is the air intake pipe, 2 is the breathing valve box, 3 is the exhalation pipe, 4 is the automatic supply and demand valve, 5 is the lung bag, 7 is the exhaust valve, 8 is the oxygen cylinder, 9 is the cylinder valve, 10 is the oxygen pressure reducing valve, 11 is the absorbent tank, 12 is the oxygen supply hose, 13 is the high-pressure gauge;

[0025] 101 is the intake joint, 102 is the pressure reducing valve body, 103 is the pressure reducing valve cavity, 104 is the pressure reducing piston, 105 is the pressure reducing valve disc, 106 is the pressure reducing spring, 107 is the pressure reducing valve cover, 108 is the medium-pressure air outlet, 109 is the pressure reducing air passage, 110 is the oxygen nozzle, 111 is the high-pressure gauge joint;

[0026] 1101 is the tank body, 1102 is the tank cover, 1103 is the absorbent layer, 1104 is the water-absorbing sponge layer;

[0027] 202 is the mouthpiece, 203 is the breathing diaphragm, 204 is the inner sleeve, 205 is the vent hole, 206 is the lever;

[0028] 401 is the supply and demand valve body, 402 is the supply and demand valve cover, 403 is the balance pipe, 404 is the outer cover, 405 is the pressing pad, 406 is the driving diaphragm, 407 is the supply and demand valve seat, 408 is the supply and demand piston rod, 409 is the balance seat, 410 is the supply and demand piston disc, 411 is the supply and demand spring, 412 is the fixing nut, 413 is the adjusting screw, 414 is the arch rod;

[0029] 701 is the exhaust valve cover, 702 is the compression spring, 703 is the flanging, 704 is the exhaust valve seat, 705 is the one-way diaphragm, 706 is the fixing seat, 707 is the exhaust diaphragm, 708 is the sliding nut, 709 is the return spring, 710 is the exhaust valve body, 711 is the chute. Detailed implementation manners

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Embodiment: As Figures 1-7 shown,

[0032] A lightweight underwater circulation breathing apparatus includes a lung bag 5, an oxygen cylinder 8 is provided on the lung bag 5, a cylinder valve 9 is installed at the air outlet end of the oxygen cylinder 8, the cylinder valve 9 is connected to an oxygen pressure reducing valve 10, the oxygen pressure reducing valve 10 has two medium-pressure air outlet ports 108, one of the medium-pressure air outlet ports 108 is communicated with the lung bag 5, and the other medium-pressure air outlet port 108 is connected to one end of an oxygen supply hose 12, the other end of the oxygen supply hose 12 is connected to the air inlet end of an automatic supply and demand valve 4 provided on the lung bag 5, and the air outlet end of the automatic supply and demand valve 4 communicates with the lung bag 5; an absorbent tank 11 is further provided on the lung bag 5, and the absorbent tank 11 communicates with the lung bag 5; an air intake pipe 1 and an exhalation pipe 3 are installed on the absorbent tank 11, one end of the air intake pipe 1 penetrates through the absorbent tank 11 and then communicates with the lung bag 5, and the other end is connected to the air intake joint of a breathing valve box 2, one end of the exhalation pipe 3 communicates with the absorbent tank 11, and the other end is connected to the exhalation joint of the breathing valve box 2, and the breathing valve box 2 has a mouthpiece 202; an exhaust valve 7 is further provided on the absorbent tank 11, and the exhaust valve 7 communicates with the absorbent tank 11.

[0033] The lightweight underwater circulation breathing apparatus mainly consists of two parts: one part is the air supply system, and the other part is the breathing circulation system. The air supply system is responsible for decompressing and supplying air, and the breathing circulation system is connected to the human lungs to balance the environmental pressure, ensure smooth direct breathing circulation between the human body and the breathing apparatus, and absorb the carbon dioxide gas exhaled by the human body.

[0034] The air supply system mainly consists of an oxygen cylinder 8, a cylinder valve 9, an oxygen pressure reducing valve 10, and a high-pressure gauge 13. Among them, the oxygen pressure reducing valve 10 is installed on the lung bag 5, an oxygen nozzle 110 is installed at the medium-pressure air outlet port 108 of the pressure reducing valve, and the oxygen supply hose 12 is installed inside the lung bag 5, with one end connected to the oxygen pressure reducing valve 10 and the other end connected to the automatic supply and demand valve 4.

[0035] The oxygen pressure reducing valve 10 includes an air inlet joint 101, a pressure reducing valve body 102, and a pressure reducing valve cover 107 that are connected in sequence; the air inlet end of the air inlet joint 101 is connected to the gas cylinder valve 9, a pressure reducing valve chamber 103 is formed between the pressure reducing valve body 102 and the pressure reducing valve cover 107, and an air inlet passage connecting the air inlet joint 101 and the pressure reducing valve chamber 103 is provided on the pressure reducing valve body 102; a pressure reducing piston 104 is slidably fitted in the pressure reducing valve chamber 103, one end of the pressure reducing piston 104 faces the air inlet passage of the pressure reducing valve chamber 103, and a pressure reducing valve disc 105 is provided at the other end. The pressure reducing valve disc 105 is slidably fitted and connected to the pressure reducing valve body 102. A pressure reducing spring 106 is provided between the pressure reducing valve disc 105 and the pressure reducing valve body 102. Under the action of the pressure reducing spring 106, the end of the pressure reducing piston 104 can close the air inlet passage of the pressure reducing valve chamber 103, and there is a gap between the pressure reducing valve disc 105 and the pressure reducing valve cover 107; a pressure reducing air passage 109 is provided axially in the pressure reducing piston 104, the pressure reducing air passage 109 penetrates the pressure reducing valve disc 105, and a pressure reducing air inlet hole communicating with the pressure reducing air passage 109 is provided on the side wall of the pressure reducing piston 104; two medium-pressure air outlets 108 are provided on the pressure reducing valve cover 107, and the medium-pressure air outlets 108 communicate with the gap between the pressure reducing valve disc 105 and the pressure reducing valve cover 107; a constant-flow oxygen nozzle 110 is installed on the medium-pressure air outlet 108 communicating with the lung bag 5.

[0036] A high-pressure gauge joint 111 is further provided on the pressure reducing valve body 102. The air inlet end of the high-pressure gauge joint 111 communicates with the air outlet end of the air inlet joint 101 through a connecting air passage, and its air outlet end is connected to a high-pressure gauge 13.

[0037] The oxygen pressure reducing valve 10 is installed at the bottom of the lung bag 5 and is sealed under the pressing force of the pressure reducing valve cover 107 and the nut. When the gas cylinder valve 9 installed on the oxygen gas cylinder 8 is opened, high-pressure oxygen enters the pressure reducing valve chamber 103 after being filtered. One way enters the high-pressure gauge joint 111 to provide a gas source for the connected high-pressure gauge 13 to display the residual pressure in the gas cylinder. The other way of high-pressure gas enters the pressure reducing valve chamber 103 and is reduced in pressure under the action of the pressure reducing piston 104 and the pressure reducing spring 106 to reduce the high pressure to medium pressure. The medium-pressure gas is divided into two paths in the pressure reducing valve cover 107. One path becomes a constant-flow oxygen stream through the oxygen nozzle 110 and flows into the lung bag 5 for human respiration. The other path flows into the oxygen supply hose 12 connected to the upper pressure reducing valve body 102, and the other end of the oxygen supply hose 12 is connected to the automatic supply and demand valve 4.

[0038] The automatic supply and demand valve 4 includes a supply and demand valve body 401, a supply and demand valve cover 402, a transmission diaphragm 406, an outer cover 404 and a balance pipe 403. The supply and demand valve body 401 is located inside the lung bag 5. The supply and demand valve body 401 is a tubular structure. The supply and demand valve cover 402 is annular and connected to one end of the supply and demand valve body 401. The supply and demand valve cover 402 passes through the lung bag 5 and is connected to the outer cover 404. The middle part of the outer cover 404 is a flexible pad 405; the balance pipe 403 is close to the other end of the supply and demand valve body 401 and passes through the opposite sides of the supply and demand valve body 401; the transmission diaphragm 406 is located in the supply and demand valve body 401, and connects the balance pipe 403 with the outer cover 404. The balance tube 403 is separated from the cover 404, and the middle part of the transmission diaphragm 406 protrudes toward the outer cover 404 and fits with the pad 405; a supply and demand valve seat 407 is provided in the balance tube 403, and the supply and demand valve seat 407 is close to one end of the balance tube 403, and has a through hole in the middle thereof, and the end of the balance tube 403 close to the supply and demand valve seat 407 forms an air inlet end, and the air inlet end is connected to the end of the oxygen supply hose 12 away from the oxygen pressure reducing valve 10; a supply and demand piston rod 408 and a balance seat 409 are slidably provided in the balance tube 403, and the supply and demand piston rod 408 is located between the balance seat 409 and the supply and demand valve seat 407, and a supply and demand piston disc 406 is provided on the supply and demand piston rod 408. 10, wherein the supply and demand piston rod 408 is connected with the balance pipe 403 through the supply and demand piston disc 410 in a sliding manner, and a supply and demand spring 411 is provided between the supply and demand piston disc 410 and the balance seat 409. Under the action of the supply and demand spring 411, the supply and demand piston rod 408 can close the through hole of the supply and demand valve seat 407; a fixing nut 412 is provided at the other end of the balance pipe 403, and an adjusting screw 413 is threadedly connected in the fixing nut 412, and the adjusting screw 413 abuts against the balance seat 409 and can drive the balance seat 409 to move in the balance pipe 403; an arch rod 414 is also provided on the balance pipe 403, and the arch rod 414 is provided on the balance pipe 403. One end of 4 extends into the balance tube 403 and is movably connected with the supply and demand piston rod 408, and the arch rod 414 is rotatably connected with the balance tube 403, and the other end of the arch rod 414 extends to fit with the raised portion of the transmission diaphragm 406. When the pressing pad 405 squeezes the raised portion of the transmission diaphragm 406, the transmission diaphragm 406 can drive the arch rod 414 to move toward the air inlet end of the balance tube 403, and drive the supply and demand piston rod 408 to compress the supply and demand spring 411, so that the through hole of the supply and demand valve seat 407 is opened; an air outlet hole connected to the supply and demand valve body 401 is also provided on the balance tube 403, and the air outlet hole is located on the side of the supply and demand valve seat 407 away from the oxygen supply hose 12.

[0039] The automatic supply and demand valve 4 is installed at the upper part of the lung bag 5 and is sealed by a gasket under the pressing force of the supply and demand valve cover 402 and the outer cover 404. Medium-pressure gas flows into the balance pipe 403 through the oxygen supply hose 12. When diving or when too much oxygen is consumed, the air pressure in the lung bag 5 will be lower than the ambient pressure. Under the external pressure, the pressing pad 405 and the transmission diaphragm 406 are pushed downward, driving the supply rod to press downward, so that the supply and demand piston rod 408 overcomes the elastic force of the supply and demand spring 411 and retreats backward to open the valve port of the supply and demand valve seat 407, allowing medium-pressure oxygen to flow into the lung bag 5 through the balance pipe 403. When the pressure in the lung bag 5 is balanced with the external pressure after the inflowing gas, the transmission diaphragm 406 resets upward and the position of the supply rod is restored. Under the action of the spring force, the supply and demand piston rod 408 moves forward, and the gasket on the supply and demand piston rod 408 acts on the valve port to prevent medium-pressure gas from entering the balance pipe 403. An adjusting screw 413 is installed at the other end of the balance pipe 403 of the automatic supply and demand valve 4, which can finely adjust the pressure of the supply and demand spring 411, facilitating the adjustment of the opening and closing pressure during manufacturing and assembly.

[0040] The respiratory circulation system mainly consists of an exhalation pipe 3, a respiratory valve box 2, an inhalation pipe 1, an automatic supply and demand valve 4, a lung bag 5, an exhaust valve 7, and an absorbent tank 11. Among them, the absorbent tank 11 is of an integrated design.

[0041] The absorbent tank 11 includes a tank body 1101 arranged inside the lung bag 5 and a tank cover 1102 arranged outside the lung bag 5. An air hole communicating with the lung bag 5 is provided at the bottom of the tank body 1101; an absorbent layer 1103 is provided in the tank body 1101, and water-absorbing sponge layers 1104 are laid between the absorbent layer 1103 and both the tank cover 1102 and the bottom of the tank body 1101.

[0042] The absorbent tank 11 is installed in the middle of the lung bag 5 and is fastened and sealed through a mounting seat, a flange, and a gasket. The tank body 1101 is installed on the mounting seat and is sealed by a sealing ring sleeved on the tank body 1101. A passage for the inhalation pipe 1 is provided in the tank body 1101 to separate the exhaled gas that has not adsorbed carbon dioxide passing through the absorbent layer 1103 from the clean oxygen in the inhalation passage. A pull rod is installed in the middle of the tank body 1101. Before use, the water-absorbing sponge is placed at the bottom in sequence, the absorbent layer 1103 is filled in the middle, and the water-absorbing sponge and the pressing cover are covered on the upper part, and then tightened by the pressing nut on the pressing cover. Then, the tank cover 1102 is installed on the mounting seat, and the tank cover 1102 is sealed by a sealing ring installed on the cover body. Finally, the pressing cover is screwed on and tightened.

[0043] An exhalation valve seat and an inhalation valve seat are respectively provided at both ends of the breathing valve box 2, and a breathing diaphragm 203 is provided on the exhalation valve seat and the inhalation valve seat; the inhalation valve seat is connected to the inhalation pipe 1, and the exhalation valve seat is connected to the inhalation pipe 3, and the mouthpiece 202 is arranged on one side of the breathing valve box 2, and the inhalation pipe 1, the exhalation pipe 3 and the mouthpiece 202 are all in communication with the breathing valve box 2. The breathing valve box 2 is a tubular structure, and an inner sleeve 204 is rotatably connected in the breathing valve cavity, and the inner sleeve 204 is fitted with the breathing valve box 2, and a vent hole 205 is opened on the inner sleeve 204 at a position corresponding to the mouthpiece 202, and a lever 206 is provided on the side wall of the inner sleeve 204 away from the vent hole 205, and correspondingly, an adjustment hole extending along the circumference thereof is provided on the side wall of the breathing valve seat, and the lever 206 passes through the adjustment hole and is connected with the adjustment hole in a sliding fit.

[0044] The breathing valve box 2 is located in the breathing circulation system of the circulating diving equipment. The diver is connected to the breathing valve box 2 through the mouthpiece 202, so that the human respiratory system is connected to the breathing circulation system of the diving equipment.

[0045] The breathing valve box 2 is integrally formed, and the left and right sides of the breathing valve box 2 are respectively provided with an exhalation joint and an inhalation joint. The exhalation joint is provided with an exhalation valve seat and a breathing diaphragm 203, and the inhalation joint is provided with an inhalation valve seat and a breathing diaphragm 203. An inner sleeve 204 is provided in the middle of the breathing valve box 2, and the lever 206 is limitedly installed on the inner sleeve 204 through the adjustment hole on the breathing valve box 2. O-rings for sealing are provided at both ends of the inner sleeve 204, and an O-ring for sealing the inner sleeve 204 is provided in the middle.

[0046] The exhaust valve 7 includes an exhaust valve body 710 with an air passage running through both ends thereof. At the intake end of the exhaust valve body 710, a one-way diaphragm 705 is provided. When the one-way diaphragm 705 is open, gas can enter the air passage from the intake end. On the end face of the outlet end of the valve body, a chute 711 is provided around its circumference. A sliding nut 708 is slidably fitted in the chute 711. The sliding nut 708 is slidably connected to the inner wall of the chute 711 and has a gap with the outer wall of the chute 711. A return spring 709 is provided between the sliding nut 708 and the bottom of the chute 711. An exhaust valve cover 701 is detachably connected to the sliding nut 708. An exhaust valve seat 704 is provided between the exhaust valve cover 701 and the one-way diaphragm 705. A compression spring 702 is provided between the exhaust valve seat 704 and the exhaust valve cover 701. One end of the exhaust valve seat 704 close to the exhaust valve cover 701 has a flanged edge 703 that turns outward. An exhaust diaphragm 707 is provided between the flanged edge 703 and the sliding nut 708. Under the action of the return spring 709 and the compression spring 702, the sliding nut 708 cooperates with the flanged edge 703 of the exhaust valve seat 704 to clamp the exhaust diaphragm 707 and close the air passage of the exhaust valve body 710. An exhaust hole is provided on the exhaust valve cover 701. When there is a gap between the flanged edge 703 of the exhaust valve seat 704 and the exhaust diaphragm 707, the air passage of the exhaust valve body 710 is connected to the exhaust hole through this gap. A tubular fixed seat 706 is provided inside the exhaust valve body 710. The fixed seat 706 is fixedly connected to the exhaust valve body 710, and its open end faces the exhaust valve cover 701. The one-way diaphragm 705 is provided inside the fixed seat 706 and is slidably connected to the closed end of the fixed seat 706. A number of air holes are also provided on the closed end of the fixed seat 706. The exhaust valve seat 704 is slidably fitted inside the fixed seat 706.

[0047] The exhaust valve body 710 of the exhaust valve 7 is directly installed on the lid 1102 of the absorbent tank 11 and sealed with a sealing gasket. The exhaust diaphragm 707, the sliding nut 708, and the return spring 709 are located between the exhaust valve cover 701 and the fixed seat 706. The one-way diaphragm 705 is installed at the center of the fixed seat 706. The exhaust valve seat 704 is installed on the exhaust diaphragm 707, and a compression spring 702 is installed between the exhaust valve cover 701 and the exhaust valve seat 704. The exhaust valve cover 701 presses on the compression spring 702. The exhaust valve cover 701 is connected to the sliding nut 708 through internal threads, so that the elastic force of the return spring 709 is transmitted to the exhaust valve seat 704 to press the exhaust diaphragm 707 for sealing.

[0048] In the present invention, an absorbent tank is installed on the lung bag. An oxygen channel is provided in the absorbent tank for connecting the inspiratory pipeline. The oxygen injected into the lung bag enters the inspiratory pipeline through the oxygen channel and then enters the breathing valve box for human breathing. The exhaled gas of the human body contains a certain amount of carbon dioxide. The exhaled gas enters the upper part of the absorbent tank through the expiratory pipeline. After the exhaled gas is filtered by the absorbent to remove carbon dioxide, it re-enters the lung bag and then enters the oxygen channel again for human breathing.

[0049] During the diving process, due to the influence of water pressure, the gas in the lung bag is rapidly compressed. To ensure the pressure balance between the inside of the lung bag and the water pressure, the automatic supply and demand valve will automatically open to supplement oxygen into the lung bag to maintain pressure balance when the pressure inside the lung bag drops. During the ascending process, due to the decrease in water pressure, the gas in the lung bag will expand, causing the pressure inside the lung bag to be higher than the ambient pressure, which may cause compression injury to the diver's lungs. To ensure gas balance, an exhaust valve is provided on the cover of the absorbent tank. When the pressure inside the lung bag rises to a certain pressure value, the exhaust valve will automatically open to exhaust gas to maintain the pressure inside the lung bag and avoid the occurrence of lung compression injury.

[0050] The present invention uses oxygen as the gas source and is used at depths shallower than 7 meters. This breathing apparatus adopts a closed-circuit breathing circuit. When the diver uses it, he inhales pure oxygen. After human metabolism, the exhaled gas contains a mixed gas of about 4% carbon dioxide and oxygen. After the mixed gas is absorbed by the absorbent tank to remove carbon dioxide, it becomes clean oxygen again, re-enters the lung bag and then enters the inspiratory pipeline for human breathing. The gas supply system is integrated on the lung bag, and the medium-pressure gas supply pipeline is installed in the lung bag, reducing the external pipeline, making the equipment more compact in shape. The weight is reduced by 40% compared with similar underwater closed-circuit breathing apparatuses. The operation time is longer, the oxygen utilization rate is high, and there are almost no bubbles during use. It is small in size, light in weight, easy to carry, high in integration, and convenient for maintenance.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the applicant has described the present invention in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solution of the present invention without departing from the purpose and scope of the present technical solution should be covered within the scope of the claims of the present invention.

Claims

1. A lightweight underwater circulation breathing apparatus, characterized in that, it includes a lung bag, an oxygen cylinder is provided on the lung bag, a cylinder valve is installed at the air outlet end of the oxygen cylinder, the cylinder valve is connected to an oxygen pressure reducing valve, the oxygen pressure reducing valve has two medium-pressure air outlet ports, one of the medium-pressure air outlet ports is communicated with the lung bag, and the other medium-pressure air outlet port is connected to one end of an oxygen supply hose, the other end of the oxygen supply hose is connected to the intake end of an automatic supply and demand valve provided on the lung bag, and the air outlet end of the automatic supply and demand valve communicates with the lung bag; an absorbent tank is also provided on the lung bag, and the absorbent tank communicates with the lung bag; an intake pipe and an exhaust pipe are installed on the absorbent tank, one end of the intake pipe penetrates through the absorbent tank and then communicates with the lung bag, and the other end is connected to the intake joint of the breathing valve box, one end of the exhaust pipe communicates with the absorbent tank, and the other end is connected to the exhaust joint of the breathing valve box, and the breathing valve box has a mouthpiece; an exhaust valve is also provided on the absorbent tank, and the exhaust valve communicates with the absorbent tank; the oxygen pressure reducing valve includes an intake joint, a pressure reducing valve body and a pressure reducing valve cover connected in sequence; the intake end of the intake joint is connected to the cylinder valve, a pressure reducing valve cavity is formed between the pressure reducing valve body and the pressure reducing valve cover, and an intake passage communicating the intake joint with the pressure reducing valve cavity is provided on the pressure reducing valve body; a pressure reducing piston is slidably fitted in the pressure reducing valve cavity, one end of the pressure reducing piston faces the intake passage of the pressure reducing valve cavity, and the other end is provided with a pressure reducing valve disc, the pressure reducing valve disc is slidably fitted and connected with the pressure reducing valve body, a pressure reducing spring is provided between the pressure reducing valve disc and the pressure reducing valve body, under the action of the pressure reducing spring, the end of the pressure reducing piston can close the intake passage of the pressure reducing valve cavity, and there is a gap between the pressure reducing valve disc and the pressure reducing valve cover; a pressure reducing air passage is provided axially in the pressure reducing piston, the pressure reducing air passage penetrates through the pressure reducing valve disc, and a pressure reducing intake hole communicating with the pressure reducing air passage is provided on the side wall of the pressure reducing piston; the two medium-pressure air outlet ports are arranged on the pressure reducing valve cover, and the medium-pressure air outlet ports communicate with the gap between the pressure reducing valve disc and the pressure reducing valve cover; a constant-flow oxygen nozzle is installed on the medium-pressure air outlet port communicating with the lung bag; The exhaust valve includes an exhaust valve body. There is an air passage running through both ends of the exhaust valve body. A one-way diaphragm is provided at the intake end of the exhaust valve body. When the one-way diaphragm is open, gas can enter the air passage from the intake end. A sliding groove is provided around the circumference of the end face of the outlet end of the valve body. A sliding nut is slidably fitted in the sliding groove. The sliding nut is slidably connected to the inner wall of the sliding groove and has a spacing from the outer wall of the sliding groove. A return spring is provided between the sliding nut and the bottom of the sliding groove. An exhaust valve cover is detachably connected to the sliding nut. An exhaust valve seat is provided between the exhaust valve cover and the one-way diaphragm. A compression spring is provided between the exhaust valve seat and the exhaust valve cover. One end of the exhaust valve seat close to the exhaust valve cover has a flanging that turns outward. An exhaust diaphragm is provided between the flanging and the sliding nut. Under the action of the return spring and the compression spring, the sliding nut cooperates with the flanging of the exhaust valve seat to clamp the exhaust diaphragm, closing the air passage of the exhaust valve body. An exhaust hole is provided on the exhaust valve cover. When there is a gap between the flanging of the exhaust valve seat and the exhaust diaphragm, the air passage of the exhaust valve body is connected to the exhaust hole through this gap.

2. The lightweight underwater circulation breathing apparatus according to claim 1, characterized in that, a high-pressure gauge connector is further provided on the decompression valve body. The intake end of the high-pressure gauge connector communicates with the outlet end of the intake connector through a connecting air passage, and its outlet end is connected to a high-pressure gauge.

3. The lightweight underwater circulation breathing apparatus according to claim 1, characterized in that, The automatic supply and demand valve comprises a supply and demand valve body, a supply and demand valve cover, a transmission diaphragm, an outer cover and a balance pipe. The supply and demand valve body is located inside the lung bag and is a tubular structure. The supply and demand valve cover is annular and connected to one end of the supply and demand valve body. The supply and demand valve cover passes through the lung bag and is connected to the outer cover. The middle part of the outer cover is a flexible cushion. The balance pipe is close to the other end of the supply and demand valve body and passes through the opposite sides of the supply and demand valve body. The transmission diaphragm is located in the supply and demand valve body and separates the balance pipe from the outer cover. The balance tube is separated, and the middle part of the transmission diaphragm is raised toward the outer cover and fits with the pad; a supply and demand valve seat is arranged in the balance tube, and the supply and demand valve seat is close to one end of the balance tube, and a through hole is arranged in the middle thereof; the end of the balance tube close to the supply and demand valve seat forms an air inlet end, and the air inlet end is connected to the end of the oxygen supply hose away from the oxygen pressure reducing valve; a supply and demand piston rod and a balance seat are slidingly arranged in the balance tube, and the supply and demand piston rod is located between the balance seat and the supply and demand valve seat, and a supply and demand piston disc is arranged on the supply and demand piston rod, Wherein, the supply and demand piston rod is connected with the balancing tube by sliding cooperation through the supply and demand piston disk, and a supply and demand spring is arranged between the supply and demand piston disk and the balancing seat, and under the action of the supply and demand spring, the supply and demand piston rod can close the through hole of the supply and demand valve seat; a fixing nut is arranged at the other end of the balancing tube, and an adjusting screw is threadedly connected in the fixing nut, and the adjusting screw abuts against the balancing seat and can drive the balancing seat to move in the balancing tube; an arch rod is also arranged on the balancing tube, one end of the arch rod extends into the balancing tube and is movably connected with the supply and demand piston rod, and the arch rod is rotatably connected with the balancing tube, and the other end of the arch rod extends to fit with the raised portion of the transmission diaphragm, and when the pressing pad squeezes the raised portion of the transmission diaphragm, the transmission diaphragm can drive the arch rod to move toward the air inlet end of the balancing tube, and drive the supply and demand piston rod to compress the supply and demand spring, so that the through hole of the supply and demand valve seat is opened; an air outlet hole connected with the supply and demand valve body is also arranged on the balancing tube, and the air outlet hole is located on the side of the supply and demand valve seat away from the oxygen supply hose.

4. A lightweight underwater rebreather according to claim 1, It is characterized in that The absorbent tank comprises a tank body arranged inside the lung bag and a tank cover arranged outside the lung bag, and an air hole communicating with the lung bag is arranged at the bottom of the tank body; an absorbent layer is arranged in the tank body, and a water-absorbing sponge layer is laid between the absorbent layer, the tank cover and the bottom of the tank body.

5. A lightweight underwater rebreather according to claim 1, It is characterized in that An exhalation valve seat and an inhalation valve seat are respectively provided at both ends of the breathing valve box, and a breathing diaphragm is provided on the exhalation valve seat and the inhalation valve seat; the inhalation valve seat is connected to the inhalation pipe, and the exhalation valve seat is connected to the exhalation pipe, and the mouthpiece is arranged on one side of the breathing valve box, and the inhalation pipe, the exhalation pipe and the mouthpiece are all in communication with the breathing valve box.

6. A lightweight underwater rebreather according to claim 5, It is characterized in that The breathing valve box is a tubular structure, in which an inner sleeve is rotatably connected, and the inner sleeve is in close contact with the breathing valve box. A vent hole is provided on the inner sleeve at a position opposite to the mouthpiece, and a lever is provided on the side wall of the inner sleeve away from the vent hole. Correspondingly, an adjustment hole extending along the circumference of the breathing valve seat is provided on the side wall. The lever passes through the adjustment hole and is slidably connected to the adjustment hole.

7. A lightweight underwater rebreather according to claim 1, It is characterized in that A cylindrical fixed seat is provided in the exhaust valve body, and the fixed seat is fixedly connected to the exhaust valve body, with its open end facing the exhaust valve cover. The one-way diaphragm is provided in the fixed seat and connected with the closed end of the fixed seat in a sliding fit. A plurality of air holes are also provided at the closed end of the fixed seat. The exhaust valve seat is slidingly provided in the fixed seat.

Images