Double-closed-loop circulation respirator

Abstract

The invention relates to the technical field of respirators, in particular to a double-closed-loop circulation respirator which comprises a mouthpiece with a one-key breathing loop switching function, a machine A, a machine B and an air supply module with a one-way valve function, the internal structures of the machine A and the machine B are the same, and the machine A and the machine B are connected through a connecting mechanism. The upper end of the machine A and the upper end of the machine B are both communicated with the mouthpiece through hose assemblies used for expiration and inspiration, and the air supply module is communicated with the machine A and the machine B; through cooperation of the air supply module, the hose assembly, the mouthpiece and the connecting mechanism, the machine A and the machine B are linked, the underwater working time can be greatly prolonged through double-machine linkage, and meanwhile, double guarantees are provided, that is, when water enters one machine or a fault occurs, the machine can be rapidly switched to the other machine to work; and compared with single-machine diving, the number of carried gas cylinders can be reduced, and the underwater work intensity of the diver is relieved.

Description

Technical Field

[0001] The invention belongs to the technical field of respirators, and in particular relates to a double closed-circuit respirator. Background Art

[0002] An underwater breathing apparatus is a device used to provide divers with breathing gas in an underwater environment. It is widely used in diving, underwater exploration, marine scientific research, military diving, and underwater rescue. Currently, the most common underwater breathing apparatus is usually a single closed-circuit rebreather, which allows divers to recycle the exhaled gas when breathing underwater. The gas exhaled by the diver will be filtered and purified inside the rebreather to remove carbon dioxide and other harmful substances, and at the same time supplement the necessary oxygen to supply the diver with breathing again.

[0003] The current single closed-circuit rebreather is mainly composed of a gas tank, a breathing regulator, a purification device and an oxygen supplement device. The gas tank is used to store the initial mixture of oxygen and inert gas, which will be recycled during the diving process; the breathing regulator is used to ensure that the diver can smoothly obtain the purified gas during the breathing process; the purification device is used to absorb carbon dioxide in the exhaled gas. When the exhaled gas containing carbon dioxide passes through the purification device, the carbon dioxide will undergo a chemical reaction and be removed. During the purification process, the system will detect the oxygen partial pressure (the pressure generated by the oxygen molecules contained in the air). If the oxygen partial pressure is lower than the normal value, the oxygen supplement device will automatically or manually add oxygen to ensure that the oxygen content in the gas supplied to the diver remains at a safe level. By recycling and purifying the exhaled gas, it provides divers with a safe and effective way to breathe underwater.

[0004] However, since the existing single closed-circuit rebreather needs to carry a large amount of backup escape gas in case of emergency when working underwater, carrying a large amount of backup escape gas increases the diver's underwater work intensity, produces more carbon dioxide, and increases the diving risk. Therefore, we need to propose a dual closed-circuit rebreather to solve the above-mentioned problems, so that it can automatically or manually replenish dilution gas when the oxygen partial pressure is low, reduce the number of gas cylinders carried, and reduce the intensity of the diver's underwater work. Summary of the invention

[0005] In view of the above problems, the present invention provides a dual closed-circuit rebreather, which can reduce the number of gas cylinders carried and reduce the intensity of underwater work of divers, including a mouthpiece with a one-button switching breathing circuit function, an A machine and a B machine with the same internal structure, and an air supply module with a one-way valve function, wherein the A machine and the B machine are connected by a connecting mechanism, the upper ends of the A machine and the B machine are connected to the mouthpiece through a hose assembly for exhalation and inhalation, and the air supply module is connected to the A machine and the B machine respectively;

[0006] The A machine and the B machine are used to provide pure oxygen gas and diluent gas and can circulate and process the carbon dioxide exhaled by divers;

[0007] The gas supply module is configured as a pure oxygen integrated gas supply module and a dilution gas integrated gas supply module. The pure oxygen integrated gas supply module realizes one-key switching of the flow path of pure oxygen gas from machine A to machine B. The switching valve also serves as a shut-off valve to prevent gas flow between machine A and machine B. The dilution gas integrated gas supply module is used to replenish a large amount of dilution gas to machine A and machine B when the oxygen partial pressure value is high.

[0008] Furthermore, the A machine and the B machine both include a gas cylinder, a carbon fiber shell and a machine body located in the carbon fiber shell. The lower end of the gas cylinder is connected to the lower end of the air supply module through a first-stage pressure reducer. A switch valve is provided on the pipeline connecting the gas cylinder and the air supply module. The upper end of the air supply module is connected to the machine body. A base is installed at the lower end of the carbon fiber shell. The connecting mechanism is located on the two carbon fiber shells. A diving computer is provided on one side of the carbon fiber shell. The diving computer is connected to the machine body through a waterproof line.

[0009] Furthermore, the machine body includes an integrated machine head, a fixed ring and an integrated breathing air bag, the integrated machine head is installed on the upper end of the carbon fiber shell, the integrated breathing air bag is connected to the integrated machine head through the fixed ring, and the integrated breathing air bag is located inside the carbon fiber shell, an exhaust valve is provided at the lower end of the integrated breathing air bag, and one end of the hose assembly is connected to the integrated machine head.

[0010] Furthermore, the machine body also includes a carbon dioxide adsorbent tank located inside the integrated breathing bag, a guide bowl cover is provided at the lower end of the carbon dioxide adsorbent tank, the upper end of the carbon dioxide adsorbent tank is connected to the integrated machine head, and the guide bowl cover is located at the lower end of the carbon dioxide adsorbent tank.

[0011] Furthermore, the machine body also includes a screw located inside the carbon dioxide adsorbent tank, the upper end of the screw is connected to the integrated machine head through a first nut, the upper end of the carbon dioxide adsorbent tank is provided with an air intake filter cover plate, the lower end of the carbon dioxide adsorbent tank is provided with an air outlet filter cover plate, and the air intake filter cover plate and the air outlet filter cover plate are both sleeved on both ends of the screw.

[0012] Furthermore, an air supply valve and an oxygen probe cover are provided inside the integrated machine head, and three first holes with internal thread sections are opened on the oxygen probe cover, and the three first holes are internally threadedly connected with oxygen probes, and a waterproof sealing ring is provided at the connection between the oxygen probe and the oxygen probe cover, and a gas check valve is threadedly connected on the integrated machine head.

[0013] Furthermore, the hose assembly includes a first inhalation hose, a second inhalation hose, a first exhalation hose and a second exhalation hose, one end of the first inhalation hose and the first exhalation hose are both connected to one side of the mouthpiece, the other end of the first inhalation hose and the first exhalation hose are both connected to machine A, one end of the second inhalation hose and the second exhalation hose are both connected to the other side of the mouthpiece, and the other end of the second exhalation hose and the second exhalation hose are both connected to machine B.

[0014] Furthermore, the mouthpiece is provided with a knob accessory for switching between machine A working mode and machine B working mode. By rotating the knob accessory, the gas passage connecting the mouthpiece to machine A or machine B can be switched. When the gas passage between the mouthpiece and machine A is opened, it is the machine A working mode.

[0015] Furthermore, the pure oxygen integrated gas supply module includes a first module main shell and a switching rod located inside the first module main shell, the outer wall of the first module main shell is provided with a switching knob, and the first gas addition valve and a sequential needle valve are respectively provided on the opposite sides of the first module main shell, the lower end of the first module main shell is connected to the first-stage pressure reducer through the first air inlet medium-pressure pipe, and the upper end of the first module main shell is connected to the interior of the integrated machine head of the A machine and the B machine through two first air outlet medium-pressure pipes, and a gas check valve is also provided at the connection between the first air outlet medium-pressure pipe and the integrated machine head and the connection between the first air inlet medium-pressure pipe and the first module main shell.

[0016] Furthermore, the dilution gas integrated air supply module includes a second module main shell, the upper end of the second module main shell is connected to the interior of the A machine and the B machine respectively through a second air outlet medium-pressure pipe, and a second gas addition valve and an air source connector are respectively provided on opposite sides of the second module main shell, and the lower end of the second module main shell is connected to another first-stage pressure reducer through a second air inlet medium-pressure pipe, and a gas check valve is also provided at the connection between the second air outlet medium-pressure pipe and the second module main shell and at the connection between the second air inlet medium-pressure pipe and the second module main shell.

[0017] Furthermore, an exhalation one-way valve is provided at the connection between the mouthpiece and the first exhalation hose and the second exhalation hose, and an inhalation one-way valve is provided at the connection between the mouthpiece and the first inhalation hose and the second inhalation hose.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention links machine A and machine B together through the coordination of the air supply module, hose assembly, mouthpiece and connecting mechanism. The dual-machine linkage can greatly increase the underwater working time and provide double protection, that is, when one machine is flooded or fails, it can be quickly switched to another machine to work; compared with single-machine diving, it can also reduce the number of gas cylinders carried and reduce the intensity of underwater work of divers.

[0020] 2. The present invention can prevent gas or water backflow by setting up an air supply module with a one-way valve function. If machine A does not work or water enters machine A, it switches to machine B working mode. The gas check design of the module can prevent the gas or water remaining inside machine A from flowing back into the module through the first air outlet medium-pressure pipe, thereby preventing cross-flow of gas or secondary water inflow.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It shows a schematic diagram of the main view side structure according to an embodiment of the present invention;

[0024] Figure 2 A schematic cross-sectional structure diagram according to an embodiment of the present invention is shown;

[0025] Figure 3 It shows a schematic diagram of the rear-view structure according to an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the base side structure according to an embodiment of the present invention is shown;

[0027] Figure 5 A schematic diagram of the installation structure of a hose assembly according to an embodiment of the present invention is shown;

[0028] Figure 6 A schematic structural diagram of a pure oxygen integrated gas supply module according to an embodiment of the present invention is shown;

[0029] Figure 7The schematic diagram of the structure of the integrated dilution gas supply module according to an embodiment of the present invention is shown. In the figure: 1. Machine A; 101. Gas cylinder; 102. Carbon fiber shell; 103. Base; 104. Exhaust valve; 111. Integrated machine head; 112. Integrated breathing air bag; 113. Diversion bowl cover; 114. Air replenishment valve; 115. Carbon dioxide adsorbent tank; 116. Screw; 117. Inlet filter cover; 118. Outlet filter cover; 2. Mouthpiece; 21. Knob accessory; 3. Connection mechanism; 31. Stainless steel bracket; 32. Hand-tightened bolt; 33. Mounting bracket; 4. Hose assembly; 41. First exhalation Hose; 42. First inhalation hose; 43. Second inhalation hose; 44. Second exhalation hose; 5. Air supply module; 51. First module main shell; 52. First outlet medium-pressure pipe; 53. First inlet medium-pressure pipe; 54. Switch knob; 55. Sequential needle valve; 56. First gas adding valve; 57. Second module main shell; 58. Second gas adding valve; 59. Second outlet medium-pressure pipe; 510. Gas source connector; 511. Second inlet medium-pressure pipe; 6. Diving computer; 7. Waterproof line; 8. First-stage pressure reducer; 9. Machine B. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a dual closed-circuit rebreather, such as Figure 1-7 As shown, it includes a mouthpiece 2 with a one-button switching breathing circuit function, an A machine 1 and a B machine 9 with the same internal structure, and an air supply module 5 with a one-way valve function. The A machine 1 and the B machine 9 are connected by a connecting mechanism 3. The upper ends of the A machine 1 and the B machine 9 are connected to the mouthpiece 2 through a hose assembly 4 for exhalation and inhalation, and the air supply module 5 is connected to the A machine 1 and the B machine 9 respectively; through the cooperation of the air supply module 5, the hose assembly 4, the mouthpiece 2 and the connecting mechanism 3, the A machine 1 and the B machine 9 are linked together. The dual-machine linkage can greatly increase the underwater working time and provide double protection at the same time, that is, when one machine is flooded or fails, it can quickly switch to another machine to work; compared with single-machine diving, it can also reduce the number of gas cylinders 101 carried, reducing the intensity of the diver's underwater work.

[0032] The A machine 1 and the B machine 9 are used to provide pure oxygen gas and dilution gas and can circulate and process the carbon dioxide exhaled by the diver; the A machine 1 and the B machine 9 both include a gas cylinder 101, a carbon fiber shell 102 and a machine body located in the carbon fiber shell 102, the lower end of the gas cylinder 101 is connected to the lower end of the gas supply module 5 through a first-stage pressure reducer 8, a switch valve is provided on the pipeline connecting the gas cylinder 101 and the gas supply module 5, the upper end of the gas supply module 5 is connected to the machine body, the lower end of the carbon fiber shell 102 is installed with a base 103, and the connecting mechanism 3 is located between the two carbon fiber shells. 102, a diving computer 6 is arranged on one side of the carbon fiber shell 102, and the diving computer 6 is connected to the machine body through a waterproof line 7. The A machine 1 and the B machine 9 are conveniently connected through a connecting mechanism 3. One of the gas cylinders 101 is used to store high-pressure oxygen, and the other gas cylinder is used to store high-pressure diluent. The high-pressure oxygen is reduced to a pressure suitable for divers to breathe through a first-stage pressure reducer 8. The carbon fiber shell 102 is light and has high strength, which protects the internal machine body from damage by underwater pressure. The machine body is used to circulate the carbon dioxide exhaled by the diver and mix it with fresh oxygen for the diver to breathe.

[0033] The machine body includes an integrated machine head 111, a fixing collar and an integrated breathing air bag 112. The integrated machine head 111 is installed at the upper end of the carbon fiber shell 102. The integrated breathing air bag 112 is connected to the integrated machine head 111 through the fixing collar, and the integrated breathing air bag 112 is located inside the carbon fiber shell 102. The lower end of the integrated breathing air bag 112 is provided with an exhaust valve 104, and the exhaust valve 104 is used to discharge the overloaded gas or water in the A machine 1 and the B machine 9. One end of the hose assembly 4 is connected to the integrated machine head 111, and the one end of the hose assembly 4 is connected to the integrated machine head 111. The integrated breathing airbag 112 is sleeved on the fixing ring, and a sealing groove is provided on the fixing ring. After the integrated breathing airbag 112 is sleeved on the fixing ring, a fluororubber sealing ring is sleeved on the outside to fix the integrated breathing airbag 112 and the fixing ring. After the fluororubber sealing ring is sleeved and fixed, an adjustable stainless steel pipe clamp is added to fix it to achieve a sealing effect. Then, the installed integrated breathing airbag 112 is sleeved into the carbon fiber shell 102, wherein the carbon fiber shell 102 has holes corresponding to the fixing ring, and the carbon fiber shell 102 is provided with an adjustment position for placing the stainless steel pipe clamp;

[0034] The machine body also includes a carbon dioxide adsorbent tank 115 located inside the integrated breathing bag 112, and a guide bowl cover 113 is provided at the lower end of the carbon dioxide adsorbent tank 115. The upper end of the carbon dioxide adsorbent tank 115 is connected to the integrated machine head 111. The guide bowl cover 113 is located at the lower end of the carbon dioxide adsorbent tank 115 and plays a role in guiding and distributing gas. It ensures that the gas can pass through the adsorbent evenly, thereby improving the adsorption efficiency.

[0035] The machine body also includes a screw 116 located inside the carbon dioxide adsorbent tank 115, the upper end of the screw 116 is connected to the integrated head 111 through a first nut, an air intake filter cover 117 is provided at the upper end of the carbon dioxide adsorbent tank 115, and an air outlet filter cover 118 is provided at the lower end of the carbon dioxide adsorbent tank 115, and the air intake filter cover 117 and the air outlet filter cover 118 are both sleeved on both ends of the screw 116. The screw 116 serves as a core component in the carbon dioxide adsorbent tank 115, and plays a role in supporting and fixing the adsorbent; the upper end of the screw 116 is connected to the integrated head 111 through a first nut to ensure the stability and sealing of the entire structure.

[0036] The integrated machine head 111 is internally provided with an air supply valve 114 and an oxygen probe cover. The oxygen probe cover is provided with three first holes with internal thread sections. The three first holes are internally threadedly connected with oxygen probes. A waterproof sealing ring is provided at the connection between the oxygen probe and the oxygen probe cover, so that the oxygen probe can be easily installed on the oxygen probe cover through threads, and the waterproof sealing ring can be used to effectively isolate water vapor.

[0037] The oxygen probe cover is installed in the integrated head 111 by means of a buckle. A waterproof sealing ring is provided on the edge of the oxygen probe cover to effectively isolate water vapor. A buckle corresponding to the oxygen probe cover is provided in the integrated head 111. After the oxygen probe cover is installed in the integrated head 111, an oxygen probe bin is formed together, which serves as an area for placing oxygen probes. The oxygen probes are used to detect the oxygen content inside the A machine 1 and the B machine 9. One end of the waterproof line 7 passes through the integrated head 111 and directly passes into the oxygen probe bin, wherein one end of the waterproof line 7 connected to the A machine 1 and the B machine 9 is divided into three lines, each line is connected with a plug, which respectively corresponds to the three oxygen probe sockets in the oxygen probe bin.

[0038] The side wall of the air outlet filter cover plate 118 is provided with an external thread section, and the bottom of the carbon dioxide adsorbent tank 115 is provided with an internal thread section corresponding to the air outlet filter cover plate 118. A filter mesh is placed on the air outlet filter cover plate 118, and the air outlet filter cover plate 118 and the carbon dioxide adsorbent tank 115 are combined through the internal thread section to improve the convenience of combination; the center of the air outlet filter cover plate 118 is provided with a through hole for the screw 116 to pass through, and the screw 116 is threadedly connected with a fixing nut after passing through the filter cover plate, and the end of the screw 116 is threadedly connected to the guide bowl cover 113, and the air outlet filter cover plate 118 is connected and fixed to the screw 116 by screwing on the fixing nut.

[0039] A groove is provided on the inner contact surface of the guide bowl cover 113, and a first sealing ring is placed in the groove. A screw hole for screwing the screw 116 is opened on the guide bowl cover 113. The carbon dioxide adsorbent (i.e., calcium hydroxide particles) is poured from the top of the carbon dioxide adsorbent tank 115, and then the filter mesh and the air intake filter cover 117 are installed as a whole with a steel wire rope and an aluminum sleeve. The steel wire rope can be used as a handle to allow the through hole on the air intake filter cover 117 to pass through the screw 116. The installation method of the air intake filter cover 117 and the carbon dioxide adsorbent tank 115 is the same as the installation method of the air outlet filter cover 118 and the carbon dioxide adsorbent tank 115. At this time, the carbon dioxide adsorbent tank 115 is filled with carbon dioxide adsorbent, and the filter mesh inside can prevent the granular adsorbent from falling.

[0040] The lower end of the integrated head 111 is provided with a thread corresponding to the upper end of the carbon dioxide adsorbent tank 115, and the carbon dioxide adsorbent tank 115 is connected to the integrated head 111 through the thread. At the same time, an annular groove is provided at the connection between the integrated head 111 and the carbon dioxide adsorbent tank 115, and a second sealing ring is placed in the annular groove to ensure the air tightness between the integrated head 111 and the carbon dioxide adsorbent tank 115.

[0041] The material of the integrated breathing bag 112 is set to double-sided composite TPU, and the lower end of the integrated breathing bag 112 is provided with a second hole corresponding to the exhaust valve 104. The exhaust valve 104 includes a built-in ventilation screw cover and an external valve. The built-in ventilation screw cover is placed inside the integrated breathing bag 112, and the built-in ventilation screw cover and the external valve are assembled together through threads. One side of the lower end of the integrated breathing bag 112 is a TPU thickened layer, and the plane at the bottom of the external valve forms a sealing surface with the TPU thickened layer.

[0042] The connecting mechanism 3 includes a stainless steel bracket 31, which is arranged in an inverted 8 shape. A hand-tightening bolt 32 is threadedly connected to the middle part of the stainless steel bracket 31. The A machine 1 and the B machine 9 are respectively inserted into the slot holes of the stainless steel bracket 31, and then the hand-tightening bolt 32 is adjusted to make the slot holes of the stainless steel bracket 31 firmly fit with the outer walls of the A machine 1 and the B machine 9, so as to facilitate the connection and fixation of the A machine 1 and the B machine 9.

[0043] The hose assembly 4 includes a first inhalation hose 42, a second inhalation hose 43, a first exhalation hose 41, and a second exhalation hose 44. One end of the first inhalation hose 42 and the first exhalation hose 41 are connected to one side of the mouthpiece 2, and the other ends of the first inhalation hose 42 and the first exhalation hose 41 are connected to the A machine 1. One end of the second inhalation hose 43 and the second exhalation hose 44 are connected to the other side of the mouthpiece 2, and the other ends of the second exhalation hose 44 and the second exhalation hose 44 are connected to the B machine 9. One end of the air hose 43 and the second exhalation hose 44 are inserted into the corresponding positions on the left and right sides of the mouthpiece 2, and then clamped and fixed with a nylon tube clamp and a hexagonal screw to achieve an airtight effect. The other ends of the first inhalation hose 42, the first exhalation hose 41, the second inhalation hose 43 and the second exhalation hose 44 are inserted into the bent fittings, fixed and clamped with nylon tube clamps, and then the bent fittings are installed into the holes on the heads of the A machine 1 and the B machine 9. The bent fittings are equipped with a third sealing ring to ensure the airtightness of the joint. At the same time, the bent fittings also have a screw cap with a thread corresponding to the machine head, and the bent fittings are fixed to the machine by tightening the screw cap.

[0044] A mounting frame 33 is installed on the side wall of the carbon fiber shell 102. After the gas cylinder 101 is installed on the mounting frame 33, a strap is used to fix the gas cylinder 101 on the mounting frame 33 to improve the stability of the installation of the gas cylinder 101.

[0045] A gas check valve is threadedly connected to the integrated head 111, and a fourth sealing ring is provided at the connection between the gas check valve and the integrated head 111. The gas check valve is threaded into the integrated head 111, and the fourth sealing ring is used to improve the air tightness between the gas check valve and the integrated head 111. One end of the waterproof line 7 is threadedly connected to the integrated head 111 to improve the convenience of installing the waterproof line 7 and the integrated head 111. The other end of the waterproof line 7 is connected to the diving computer 6. The cable inside the waterproof line 7 can transmit oxygen data to the diving computer 6. The diving computer 6 can obtain the oxygen partial pressure value through a set algorithm. When the oxygen partial pressure value of the diving computer 6 is too low, a large amount of pure oxygen gas can be instantly supplemented by pressing the round cover under the air supply module 5 to increase the oxygen partial pressure and maintain it to a normal value.

[0046] The mouthpiece 2 is provided with a knob accessory 21 for switching the working mode of machine A 1 or the working mode of machine B 9. By rotating the knob accessory 21, the gas passage connecting the mouthpiece 2 with machine A 1 or machine B 9 can be switched. When the gas passage between the mouthpiece 2 and machine A 1 is opened, it is the working mode of machine A 1. Then, the switching knob 54 of the air supply module 5 on machine A 1 is rotated to the first gear position, and the gas passage of the air supply module 5 on machine A 1 flows to the inside of the integrated head 111 of machine A 1 through the first air outlet medium-pressure pipe 52. The circulation path of the gas in machine A 1 is consistent with the circulation path in machine B 9.

[0047] The gas supply module 5 is configured as a pure oxygen integrated gas supply module and a dilution gas integrated gas supply module. The pure oxygen integrated gas supply module realizes one-key switching of the flow path of pure oxygen gas from machine A 1 to machine B 9. The switching valve also serves as a shut-off valve to prevent gas flow between machine A 1 and machine B 9. The dilution gas integrated gas supply module is used to replenish a large amount of dilution gas to machine A 1 and machine B 9 when the oxygen partial pressure value is high.

[0048] The pure oxygen integrated gas supply module comprises a first module main shell 51 and a switching rod located inside the first module main shell 51, a switching knob 54 is arranged on the outer wall of the first module main shell 51, a first gas adding valve 56 and a sequential needle valve 55 are arranged on opposite sides of the first module main shell 51, the lower end of the first module main shell 51 is connected to the first-stage pressure reducer 8 through a first air inlet medium-pressure pipe 53, the upper end of the first module main shell 51 is connected to the inside of the integrated machine head 111 of the A machine 1 and the B machine 9 through two first air outlet medium-pressure pipes 52, and the connection between the first air outlet medium-pressure pipe 52 and the integrated machine head 111 and the first air inlet medium-pressure pipe 53 and the first air outlet medium-pressure pipe 52 are connected to the first air outlet medium-pressure pipe 52. A gas check valve is also provided at the connection of the module main shell 51. The needle core head inside the sequential needle valve 55 is slightly conical. Pure oxygen gas enters the interior of the sequential needle valve 55 through the gap at the needle core head, and then flows to the outside of the sequential needle valve 55 through the hole of the sequential needle valve 55. This module integrates sequential progressive and stable gas supply, one-click gas replenishment and built-in shut-off function to prevent gas cross-talk; the sequential needle valve 55 realizes the function of sequential progressive and stable gas supply, the first gas adding valve 56 realizes the function of replenishing a large amount of pure oxygen gas with one click, and the switching rod structure design inside the gas supply module 5 realizes the function of gas cross-talk from machine A 1 to machine B 9 (which can also be regarded as a gas shut-off function).

[0049] like Figure 7As shown, the dilution gas integrated air supply module includes a second module main shell 57, the upper end of the second module main shell 57 is connected to the interior of the A machine 1 and the B machine 9 respectively through the second air outlet medium-pressure pipe 59, and the second gas addition valve 58 and the air source connector 510 are respectively provided on the opposite sides of the second module main shell 57, and the lower end of the second module main shell 57 is connected to another first-stage pressure reducer 8 through the second air inlet medium-pressure pipe 511, and the connection between the second air outlet medium-pressure pipe 59 and the second module main shell 57 and the connection between the second air inlet medium-pressure pipe 511 and the second module main shell 57 are also provided with gas check valves, and the same air source or a different type of air source as that entering the second air inlet medium-pressure pipe 511 can be connected through the air source connector.

[0050] In the default state, the switch knob 54 is in the second gear, that is, the working mode of the B machine 9 is the initial gear. The switch valve of the gas cylinder 101 on the B machine 9 is opened, and the pure oxygen gas in the gas cylinder 101 filled with pure oxygen gas flows into the first module main shell 51 through the first-stage pressure reducer 8 and the first air inlet medium-pressure pipe 53. After the pure oxygen gas enters the first module main shell 51, it flows to the first air outlet medium-pressure pipe 52 through the gas check valve on the first module main shell 51, and then enters the air replenishment valve 114 in the integrated head 111 on the B machine 9 through the first air outlet medium-pressure pipe 52. When the human body inhales, due to the effect of negative pressure, the B machine 9 The gas replenishment valve 114 in the head will be automatically triggered, or by pressing the gas replenishment valve 114, pure oxygen gas will be released, and the pure oxygen gas will enter the middle layer of the B machine 9 (the interlayer between the integrated breathing air bag 112 and the carbon dioxide adsorbent tank 115), and then be transmitted to the diver from the second inhalation hose 43. The gas exhaled by the diver will then enter the inside of the carbon dioxide adsorbent tank 115 through the second exhalation hose 44. After the carbon dioxide is adsorbed by the carbon dioxide adsorbent inside the carbon dioxide adsorbent tank 115, the gas is transmitted to the middle layer of the integrated head 111 of the B machine 9, so as to achieve the recycling of pure oxygen gas.

[0051] The gas in the gas cylinder 101 filled with the dilution gas flows into the second module main shell 57 through the first-stage pressure reducer 8 and the second air inlet medium-pressure pipe 511. After the dilution gas enters the second module main shell 57, it flows into the second air outlet medium-pressure pipe 59 through the gas check valve on the second module main shell 57. The gas check valve on the second module main shell 57 can effectively prevent the gas from flowing back. Then the dilution gas enters the air replenishment valve 114 in the integrated head 111 on the B machine 9 through the second air outlet medium-pressure pipe 59. When the human body inhales, due to the effect of negative pressure, the gas replenishment valve 114 in the head of the B machine 9 will be automatically triggered, or the dilution gas can be released by pressing the gas replenishment valve 114, and the gas enters the middle layer of the B machine 9 (the integrated breathing air bag 112 and the carbon dioxide adsorption The dilution gas passes through the second medium-pressure outlet pipe 59 of the B machine 9 and enters the middle layer of the B machine 9 (the interlayer between the integrated breathing air bag 112 and the carbon dioxide adsorbent tank 115). The circulation path of the dilution gas entering the B machine 9 is consistent with the circulation path of the above-mentioned pure oxygen gas, which will not be described in detail.

[0052] When the oxygen partial pressure value displayed on the diving computer table 6 on the B machine 9 is too high, or when it is necessary to dive deeper, pressing the round cover of the second gas adding valve 58 on the middle of the B machine 9, or pressing the air replenishing valve 114 in the head of the B machine 9 (which can also be triggered automatically) can instantly replenish a large amount of dilution gas into the middle layer of the B machine 9, and the oxygen partial pressure is reduced to a normal value. For underwater rebreathers, maintaining a normal oxygen partial pressure value is very important. The above is the working mode of the B machine 9. If you switch to the working mode of the A machine 1, you must first turn the knob accessory 21 behind the mouthpiece 2 to the right to form a gas passage connected to the A machine 1. At this time, it is the working mode of the A machine 1.

[0053] If the working mode of machine A 1 is switched, the knob accessory 21 behind the mouthpiece 2 is turned to the right to form a gas passage connected to machine A 1, and then the switching knob 54 on the pure oxygen integrated gas supply module is turned to position 1, and the pure oxygen gas of the pure oxygen integrated gas supply module flows to the inside of the integrated head 111 on machine A 1 through the first outlet medium-pressure pipe 52, and the pure oxygen gas enters the middle layer of machine A through the first outlet medium-pressure pipe 52 and the corresponding holes in the integrated head 111. The circulation path of the gas in machine A is consistent with the circulation path in machine B. The dilution gas integrated head 111 on machine B 9 is connected to the inner surface of the integrated head 111. The working principle of the air supply module is also equally applicable to machine A 1. The gas entering the dilution gas integrated air supply module enters the interior of the integrated head 111 of machine A 1 through the second air outlet medium-pressure pipe 59 connected to machine A 1. The dilution gas is also replenished by inhaling or manually pressing the air replenishment valve 114 in machine A 1. Similarly, three oxygen sensors are also installed inside machine A 1. One end of the waterproof line 7 on machine A 1 is connected to the three oxygen sensors, and the other end of the waterproof line 7 is connected to the diving computer 6 on machine A 1. Pure oxygen gas or dilution gas is replenished according to the oxygen partial pressure reading on the diving computer 6.

[0054] An exhalation one-way valve is provided at the connection between the mouthpiece 2 and the first exhalation hose 41 and the second exhalation hose 44, and an inhalation one-way valve is provided at the connection between the mouthpiece 2 and the first inhalation hose 42 and the second inhalation hose 43. The pure oxygen gas in the first inhalation hose 42 enters the mouthpiece 2 through the inhalation one-way valve, and the exhaled gas of the pure oxygen gas produced by the metabolism of the diver flows into the first exhalation hose 41 through the exhalation one-way valve. The gas flow principle of the second exhalation hose 44 and the second inhalation hose 43 is the same as the gas flow principle of the first exhalation hose 41 and the first inhalation hose 42. Human breathing generates positive pressure and negative pressure. Due to the joint action of the inhalation one-way valve and the exhalation one-way valve, the passage of the inhaled gas and the passage of the exhaled gas are unchanged, which can effectively prevent cross-gas.

[0055] When exhaling, the exhaled gas enters the middle layer of the integrated breathing bag 112 and the carbon dioxide adsorbent tank 115 from the first exhalation hose 41 through the integrated head 111. In the middle layer, the exhaled gas enters the interior of the carbon dioxide adsorbent tank 115 through the holes under the guide bowl cover 113. After the carbon dioxide gas is adsorbed by the internal carbon dioxide adsorbent, the filtered gas enters the body of the diver through the first inhalation hose 42 and the mouthpiece 2 due to the negative pressure of human inhalation, thereby realizing the process of circular breathing. If there is too much gas in the integrated breathing bag 112, the exhaust valve 104 will automatically open to discharge the overloaded gas.

[0056] There is a gas passage corresponding to each side of the mouthpiece 2. The knob accessory 21 behind the mouthpiece 2 drives the internal components of the mouthpiece 2 to operate to realize a single gas passage, while ensuring the sealing of the second passage. This structural design greatly ensures the stability and safety of the operation of a single machine.

[0057] If the A machine 1 or the B machine 9 is accidentally filled with water, that is, water enters from the mouthpiece 2, the diver can exhale directly, and spit the water into the first exhalation hose 41 or the second exhalation hose 44, and enter the bottom of the integrated breathing air bag 112, and flow from the built-in ventilation screw cover of the exhaust valve 104 to the external valve. Because the exhaust valve 104 will automatically open when the diver exhales, the water will be discharged from the external valve to the outside of the machine. This is the automatic drainage function of the machine. This function can prevent the machine from being submerged in water and causing diving accidents; another situation is that the carbon dioxide adsorbent will undergo a chemical reaction to generate heat and water when absorbing carbon dioxide gas, and the generated water will flow to the guide bowl cover 113. The function of the guide bowl cover 113 is to collect water to prevent backflow. The collected water enters the bottom of the integrated breathing air bag 112 from the holes at the bottom of the guide bowl cover 113, so that the water generated inside the machine can also be automatically discharged to the outside of the machine through the exhaust valve 104.

[0058] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Double closed-circuit rebreather, characterized in that: It comprises a mouthpiece (2) with a one-touch switching breathing circuit function, an A machine (1) and a B machine (9) with identical internal structures, and an air supply module (5) with a self-contained one-way valve function, wherein the A machine (1) and the B machine (9) are connected via a connecting mechanism (3), the upper ends of the A machine (1) and the B machine (9) are connected to the mouthpiece (2) via a hose assembly (4) for exhalation and inhalation, and the air supply module (5) is connected to the A machine (1) and the B machine (9) respectively; The A machine (1) and the B machine (9) are used to provide pure oxygen gas and diluent gas and can circulate and process the carbon dioxide exhaled by divers; The gas supply module (5) is configured as a pure oxygen integrated gas supply module and a dilution gas integrated gas supply module. The pure oxygen integrated gas supply module realizes one-key switching of the flow path of pure oxygen gas from machine A (1) to machine B (9). The switching valve also serves as a stop valve to prevent gas flow between machine A (1) and machine B (9). The dilution gas integrated gas supply module is used to replenish a large amount of dilution gas to machine A (1) and machine B (9) when the oxygen partial pressure value is high.

2. The dual closed-circuit rebreather according to claim 1, characterized in that: The A machine (1) and the B machine (9) both comprise a gas cylinder (101), a carbon fiber shell (102), and a machine body located in the carbon fiber shell (102); the lower end of the gas cylinder (101) is connected to the lower end of the gas supply module (5) via a first-stage pressure reducer (8); a switch valve is provided on the pipeline connecting the gas cylinder (101) and the gas supply module (5); the upper end of the gas supply module (5) is connected to the machine body; a base (103) is installed at the lower end of the carbon fiber shell (102); the connecting mechanism (3) is located on the two carbon fiber shells (102); a diving computer (6) is provided on one side of the carbon fiber shell (102); and the diving computer (6) is connected to the machine body via a waterproof line (7).

3. The dual closed-circuit rebreather according to claim 2, characterized in that: The machine body comprises an integrated machine head (111), a fixing collar and an integrated breathing air bag (112); the integrated machine head (111) is mounted on the upper end of a carbon fiber shell (102); the integrated breathing air bag (112) is connected to the integrated machine head (111) via the fixing collar, and the integrated breathing air bag (112) is located inside the carbon fiber shell (102); an exhaust valve (104) is provided at the lower end of the integrated breathing air bag (112); and one end of the hose assembly (4) is connected to the integrated machine head (111).

4. The dual closed-circuit rebreather according to claim 3, characterized in that: The machine body further comprises a carbon dioxide adsorbent tank (115) located inside the integrated breathing air bag (112); a flow guide bowl cover (113) is provided at the lower end of the carbon dioxide adsorbent tank (115); the upper end of the carbon dioxide adsorbent tank (115) is connected to the integrated machine head (111); and the flow guide bowl cover (113) is located at the lower end of the carbon dioxide adsorbent tank (115).

5. The dual closed-circuit rebreather according to claim 4, characterized in that: The machine body further comprises a screw (116) located inside the carbon dioxide adsorbent tank (115); the upper end of the screw (116) is connected to the integrated machine head (111) via a first nut; an air intake filter cover plate (117) is arranged at the upper end of the carbon dioxide adsorbent tank (115); an air outlet filter cover plate (118) is arranged at the lower end of the carbon dioxide adsorbent tank (115); and the air intake filter cover plate (117) and the air outlet filter cover plate (118) are both sleeved on the two ends of the screw (116).

6. The dual closed-circuit rebreather according to claim 5, characterized in that: The integrated machine head (111) is internally provided with an air supply valve (114) and an oxygen probe cover. The oxygen probe cover is provided with three first holes with internal thread sections. The three first holes are internally threadedly connected with oxygen probes. A waterproof sealing ring is provided at the connection between the oxygen probe and the oxygen probe cover. A gas check valve is threadedly connected to the integrated machine head (111).

7. The dual closed-circuit rebreather according to claim 6, characterized in that: The hose assembly (4) comprises a first inhalation hose (42), a second inhalation hose (43), a first exhalation hose (41) and a second exhalation hose (44); one end of the first inhalation hose (42) and the first exhalation hose (41) are both connected to one side of the mouthpiece (2); the other ends of the first inhalation hose (42) and the first exhalation hose (41) are both connected to the A machine (1); one end of the second inhalation hose (43) and the second exhalation hose (44) are both connected to the other side of the mouthpiece (2); and the other ends of the second exhalation hose (44) and the second exhalation hose (44) are both connected to the B machine (9).

8. The dual closed-circuit rebreather according to claim 7, characterized in that: The mouthpiece (2) is provided with a knob accessory (21) for switching between the working mode of the A machine (1) or the working mode of the B machine (9). By rotating the knob accessory (21), the gas passage connecting the mouthpiece (2) to the A machine (1) or the B machine (9) can be switched. When the gas passage between the mouthpiece (2) and the A machine (1) is opened, the A machine (1) working mode is entered.

9. The dual closed-circuit rebreather according to claim 8, characterized in that: The pure oxygen integrated gas supply module comprises a first module main shell (51) and a switching rod located inside the first module main shell (51); a switching knob (54) is provided on the outer wall of the first module main shell (51); a first gas adding valve (56) and a sequential needle valve (55) are provided on opposite sides of the first module main shell (51); the lower end of the first module main shell (51) is connected to one of the first-stage pressure reducers (8) through a first air inlet medium-pressure pipe (53); the upper end of the first module main shell (51) is connected to the inside of the integrated machine heads (111) of the A machine (1) and the B machine (9) through two first air outlet medium-pressure pipes (52); and a gas check valve is also provided at the connection between the first air outlet medium-pressure pipe (52) and the integrated machine head (111) and at the connection between the first air inlet medium-pressure pipe (53) and the first module main shell (51); The dilution gas integrated air supply module comprises a second module main shell (57), the upper end of the second module main shell (57) is connected to the interior of the A machine (1) and the B machine (9) respectively through a second outlet medium-pressure pipe (59), a second gas addition valve (58) and a gas source connector (510) are respectively provided on opposite sides of the second module main shell (57), the lower end of the second module main shell (57) is connected to another first-stage pressure reducer (8) through a second inlet medium-pressure pipe (511), and a gas check valve is also provided at the connection between the second outlet medium-pressure pipe (59) and the second module main shell (57) and the connection between the second inlet medium-pressure pipe (511) and the second module main shell (57).

10. The dual closed-circuit rebreather according to claim 9, characterized in that: An exhalation one-way valve is provided at the connection between the mouthpiece (2) and the first exhalation hose (41) and the second exhalation hose (44), and an inhalation one-way valve is provided at the connection between the mouthpiece (2) and the first inhalation hose (42) and the second inhalation hose (43).

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