Oxygen supply system and oxygen supply method for saturated pressurized cabin

Abstract

The present invention discloses an oxygen supply system and method for a saturated pressurized cabin, comprising a cabin body, an oxygen supply device, a mixing chamber, an air supply module, a return air port, an exhaust port and a controller, wherein the oxygen supply device comprises a liquid oxygen tank and an oxygen bottle, the liquid oxygen tank and the oxygen bottle are connected to the mixing chamber through a first oxygen supply pipe and a second oxygen supply pipe respectively, and a first valve and a second valve are respectively arranged on the first oxygen supply pipe and the second oxygen supply pipe, and the oxygen supply device also comprises a heat exchanger, wherein a liquid oxygen channel and a heat exchange medium channel are arranged inside, and both ends of the liquid oxygen channel are connected to the first oxygen supply pipe, and liquid oxygen exchanges heat with the heat exchange medium in the liquid oxygen channel to become gaseous oxygen and then flows into the mixing chamber, and both ends of the heat exchange medium channel are connected to both ends of the first radiator through a pipeline. The present invention combines the two oxygen supply modes of the liquid oxygen tank and the oxygen bottle, and adopts a mixing chamber structure and an air supply module, so as to realize the uniform mixing of oxygen and return air and the uniform distribution in the cabin, thereby improving the reliability and safety of the oxygen supply system.

Description

Technical Field

[0001] The present application belongs to the field of saturation diving environmental control and high-pressure chamber environmental control, and specifically relates to an oxygen supply system and an oxygen supply method for a saturated pressurized chamber. Background Art

[0002] Deep saturation diving operation refers to long-term diving work in which divers are directly exposed to more than 120 meters underwater (even up to 300-500 meters). In this operation mode, divers first need to stay in the high-pressure environment chamber for a long time to adapt to the high-pressure environment underwater at great depths, and then directly enter and exit the deep underwater to carry out work, which can last up to 1 month. When divers adapt to the high-pressure environment and rest in the high-pressure environment chamber, they need to take in oxygen and exhale carbon dioxide to maintain their own health needs. In existing saturation diving chambers, when replenishing oxygen, pure oxygen is usually mixed with the return air from the return air duct. After the return air is processed by the environmental control machine, it is quickly sent into the room through the air supply main. The oxygen flow rate and time are generally 100L / min and 10min. During the oxygen replenishment stage, the oxygen concentration in the cabin gradually increases and reaches stability after the oxygen replenishment is completed.

[0003] However, the prior art usually only simply supplements oxygen. During the oxygen supplementation stage, if the high oxygen partial pressure gas in the air supply pipe cannot diffuse and balance quickly in the cabin, it may cause the oxygen partial pressure in some local areas of the cabin to be too high, causing the diver to suffer from "oxygen intoxication". This situation poses a serious threat to the health of divers, and because the density of oxygen is relatively large compared to helium, this physical property makes it easy for oxygen to deposit at the bottom of the cabin in a high-pressure cabin. In addition, there are some defects in the prior art that relies solely on liquid oxygen tanks for oxygen supply. As a single oxygen supply source, the liquid oxygen tank is troublesome to replace after the liquid oxygen is used up, and there will be interruptions in the supply. Using only oxygen cylinders has limited storage capacity and is difficult to meet the long-term oxygen supply needs of deep-sea operations. In this case, divers need to face the risk of unstable oxygen supply, which affects the health and safety of divers. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes an oxygen supply system and an oxygen supply method for a saturated pressurized cabin. By combining the two oxygen supply methods of liquid oxygen tanks and oxygen cylinders, an oxygen supply system is designed in which liquid oxygen is given priority and oxygen cylinders are used as a backup. The design of a mixing chamber structure and an air supply module is adopted to achieve uniform mixing of oxygen and return air and uniform distribution in the cabin, which not only improves the reliability and safety of the oxygen supply system, but also ensures that oxygen is quickly and evenly diffused to various parts of the cabin through the optimized air supply system, prevents the phenomenon of local excessive or low oxygen partial pressure, and meets the health needs of divers in long-term deep-sea operations.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: an oxygen supply system for a saturated pressurized cabin, comprising a cabin body, an oxygen supply device, a mixing chamber, an air supply module, a return air port, an exhaust port and a controller, the oxygen supply device comprising a liquid oxygen tank and an oxygen cylinder, the liquid oxygen tank and the oxygen cylinder are connected to the mixing chamber through a first oxygen supply pipe and a second oxygen supply pipe, respectively, the first oxygen supply pipe and the second oxygen supply pipe are provided with a first valve and a second valve, respectively, the oxygen supply device further comprises a heat exchanger, a liquid oxygen channel and a heat exchange medium channel are provided inside, both ends of the liquid oxygen channel are connected to the first oxygen supply pipe, the liquid oxygen flowing out of the liquid oxygen tank exchanges heat with the heat exchange medium in the liquid oxygen channel to become gaseous oxygen and then flows into the mixing chamber, both ends of the heat exchange medium channel are connected to both ends of the first radiator through a pipeline, the return air port is connected to the mixing chamber through a return air pipe, the mixing chamber is connected to the air supply module through an air supply pipe, the return air port is also connected to the exhaust port through an exhaust pipe, and the first valve and the second valve are both connected to the controller.

[0006] Preferably, the mixing chamber is a cylindrical cavity, and a return air inlet pipe, an oxygen inlet pipe and an exhaust pipe are arranged on the outer wall; the return air inlet pipe is arranged at the center of the first bottom surface along the axial direction of the mixing chamber, the oxygen inlet pipe is arranged on the side of the mixing chamber close to the first bottom surface and along the tangent direction of the circumference of the mixing chamber, and the exhaust pipe is arranged on the side of the mixing chamber close to the second bottom surface and perpendicular to the axial direction of the mixing chamber; the return air port is connected to the return air inlet pipe of the mixing chamber through the return air pipe, the first oxygen supplementation pipe and the second oxygen supplementation pipe are merged and connected to the oxygen inlet pipe of the mixing chamber, and the exhaust pipe of the mixing chamber is connected to the air supply module through the air supply pipe.

[0007] Preferably, the air supply module includes a main air supply port connected to an air supply duct arranged on the top of the cabin body, and the main air supply port is connected to a plurality of annularly arranged air supply branches through a straight air duct on the top of the cabin body. The air supply branches extend from the top of the cabin body along the side wall to the middle and lower side of the cabin body, and the air supply branches have several air supply terminals arranged on one side facing the inside of the cabin body.

[0008] Preferably, the cabin body includes a rest area and a working area, the rest area and the working area are separated by a partition, the first radiator is located in the working area, a second radiator is arranged in the rest area, the second radiator is arranged on a first bypass flow path of the pipeline through which the heat exchange medium in the first radiator flows back to the heat exchanger, and a first three-way valve is arranged at the inlet of the first bypass flow path.

[0009] Preferably, a spiral heat exchange tube is provided at the bottom of the liquid oxygen tank, and the spiral heat exchange tube is arranged on the second bypass flow path of the pipeline through which the heat exchange medium in the first radiator flows back to the heat exchanger, and a second three-way valve is provided at the inlet of the second bypass flow path, and the second bypass flow path is located downstream of the first bypass flow path.

[0010] Preferably, a liquid level sensor is provided in the liquid oxygen tank, and the liquid level sensor is connected to a controller. When the liquid level is lower than a liquid level threshold, the controller controls the second three-way valve to switch to the second bypass flow path.

[0011] Preferably, the return air duct is provided with a first fan and an air treatment device.

[0012] Preferably, an air diffusion assembly that can move back and forth is also provided at the bottom of the cabin body, a roller is provided at the bottom of the shell of the air diffusion assembly, and a fan is provided inside the shell of the air diffusion assembly, with its air inlet located on the side of the shell and the air outlet located on the upper part of the shell.

[0013] Preferably, the second bottom surface of the mixing chamber is made of flexible material, the second bottom surface is sealed to the side surface of the mixing chamber, and a spiral heating coil is arranged in the middle section of the mixing chamber near the inner wall.

[0014] The present invention also discloses an oxygen supply method based on the oxygen supply system of the saturated pressurized cabin, comprising the following steps:

[0015] S1, when the oxygen concentration in the cabin body is lower than the oxygen concentration threshold and the liquid level sensor detects that the liquid level is higher than the liquid level threshold, the liquid oxygen tank supplies oxygen, the controller controls the first valve to open, and the second valve remains closed;

[0016] S2, when the oxygen concentration in the cabin body is lower than the oxygen concentration threshold and the liquid level sensor detects that the liquid level is lower than the liquid level threshold, the controller controls the second three-way valve to switch to the second bypass flow path;

[0017] S3, after the first predetermined time, when the oxygen concentration in the cabin body is still lower than the oxygen concentration threshold, the oxygen cylinder supplies oxygen, the controller closes the first valve, and opens the second valve;

[0018] S4, replace the liquid oxygen tank, and switch back to the liquid oxygen tank for oxygen supply after the replacement is completed.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) The present invention significantly improves the reliability and safety of the oxygen supply system by combining the use of two oxygen supply modes, namely, liquid oxygen tanks and oxygen cylinders. Under normal circumstances, liquid oxygen tanks are used first for oxygen supply. When the liquid oxygen in the liquid oxygen tank is insufficient, the system automatically switches to oxygen cylinders for oxygen supply, thereby avoiding the problem of oxygen supply interruption caused by the exhaustion of liquid oxygen. Through sensors and control systems, real-time monitoring and intelligent regulation of the liquid level, oxygen concentration and oxygen supply status of the liquid oxygen tank are achieved, thereby ensuring that the oxygen supply system is always in the best operating state. Liquid oxygen absorbs a large amount of heat during the vaporization process and generates significant cooling energy, which is used to cool the working area and living area in the cabin. The cooling energy generated by the vaporization of liquid oxygen is transferred to the radiator system in the cabin through a heat exchanger, thereby effectively utilizing the cooling energy.

[0021] (2) The mixing chamber of the present invention is designed as a cylindrical cavity, the oxygen inlet pipe is arranged along the tangent direction of the mixing chamber, and the return air inlet pipe is arranged along the axial direction of the mixing chamber. Through this design, oxygen and return air form a vortex flow in the mixing chamber, which greatly enhances the gas mixing effect, ensures that the gas entering the cabin is evenly mixed, avoids the problem of excessive local oxygen concentration, and effectively prevents the occurrence of "oxygen intoxication". The bottom of the mixing chamber is made of flexible material, which can effectively absorb the impact of airflow, reduce airflow vibration and noise, and improve the overall stability of the system and the quietness of operation.

[0022] (3) The present invention realizes all-round oxygen supply from the top to the bottom of the cabin body through the distributed air supply module design on the top and side walls of the cabin body, combined with a movable air diffusion component at the bottom. This all-round air supply strategy significantly improves the diffusion speed and uniformity of oxygen in the cabin. When replenishing oxygen, it can also blow it up from the bottom through the fan, effectively breaking the oxygen stratification caused by density differences, promoting the convection circulation of the air in the entire cabin, and further ensuring the stability of the air pressure in the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0024] Figure 1 This is a schematic diagram of the overall structure of the oxygen supply system of the saturated pressurized cabin according to an embodiment of the present invention;

[0025] Figure 2 This is a partially enlarged view of the oxygen supply system of the saturated pressurized cabin shown in an embodiment of the present invention.

[0026] Figure 3 A schematic diagram of typical airflow directions of an air supply module of an oxygen supply system of a saturated pressurized cabin shown in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the front structure of the mixing chamber shown in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the side structure of the mixing chamber according to an embodiment of the present invention.

[0029] Figure 6 A schematic flow chart of an air pressure stabilization method of a saturated pressurized cabin air pressure stabilization system according to an embodiment of the present invention;

[0030] Figure numerals: 1-cabin body, 2-oxygen supply device, 21-liquid oxygen tank, 22-oxygen cylinder, 23-first oxygen supply pipe, 24-second oxygen supply pipe, 25-first valve, 26-second valve, 27-heat exchanger, 28-liquid oxygen channel, 29-heat exchange medium channel, 3-mixing chamber, 31-return air intake pipe, 32-oxygen intake pipe, 33-exhaust pipe, 34-first bottom surface, 35-side surface, 36-second bottom surface, 37-heating coil, 4-air supply module, 41-main air supply Inlet, 42-straight air duct, 43-air supply branch pipe, 44-air supply terminal, 5-return air outlet, 6-exhaust outlet, 7-return air duct, 71-first fan, 72-air handling device, 8-air supply duct, 9-exhaust duct, 10-first radiator, 11-second radiator, 12-delivery pump, 13-rest area, 14-work area, 15-partition, 16-first bypass flow path, 17-first three-way valve, 18-second bypass flow path, 19-second three-way valve, 20-spiral heat exchange tube. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are only for illustrative purposes. In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "include" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may be present or added.

[0032] In addition, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. All technical and scientific terms used in this specification have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0033] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] See also Figure 1-5 This embodiment provides an oxygen supply system for a saturated pressurized chamber, including a chamber body 1, an oxygen supply device 2, a mixing chamber 3, an air supply module 4, an air return port 5, an air exhaust port 6, and a controller. The chamber body 1 is the main space for divers to work and rest.

[0035] The oxygen supply device 2 includes a liquid oxygen tank 21 and an oxygen bottle 22, and the liquid oxygen tank 21 and the oxygen bottle 22 are connected to the mixing chamber 3 through the first oxygen supply pipe 23 and the second oxygen supply pipe 24, respectively, to ensure flexible oxygen supply under different circumstances. The first oxygen supply pipe 23 and the second oxygen supply pipe 24 are respectively provided with a first valve 25 and a second valve 26 for controlling the outflow of oxygen. The oxygen supply device 2 also includes a heat exchanger 27, in which a liquid oxygen channel 28 and a heat exchange medium channel 29 are arranged. The two ends of the liquid oxygen channel 28 are connected to the first oxygen supply pipe 23, and the liquid oxygen flowing out of the liquid oxygen tank 21 exchanges heat with the heat exchange medium in the liquid oxygen channel 28 to become gaseous oxygen and then flows into the mixing chamber 3, thereby realizing the gasification of liquid oxygen. The two ends of the heat exchange medium channel 29 are connected to the two ends of the first radiator 10 through a pipeline, and the cold energy in the liquid oxygen gasification process is used to cool the cabin.

[0036] The return air port 5 is connected to the mixing chamber 3 through the return air pipe 7, and the gas inside the cabin is introduced into the mixing chamber 3 and mixed with oxygen before being discharged together. The mixing chamber 3 is connected to the air supply module 4 through the air supply pipe 8, and the mixed gas is sent back to the cabin to ensure air circulation. The return air port 5 is also connected to the exhaust port 6 through the exhaust pipe 9 to discharge excess exhaust gas out of the cabin to ensure stable pressure in the cabin. The first valve 25 and the second valve 26 are both connected to the controller, and the controller adjusts the opening and closing of each valve as needed to achieve automatic control and efficient operation of the system.

[0037] The mixing chamber 3 is a cylindrical cavity, and a return air inlet pipe 31, an oxygen inlet pipe 32 and an exhaust pipe 33 are arranged on the outer wall.

[0038] The return air intake pipe 31 is arranged at the center of the first bottom surface 34 along the axial direction of the mixing chamber 3. The return air gas maintains a straight flow when entering the mixing chamber 3, ensuring the smooth entry of the gas into the mixing chamber. The oxygen intake pipe 32 is close to the first bottom surface 34 and is arranged on the side 35 of the mixing chamber 3 along the tangential direction of the circumference of the mixing chamber 3. This tangential direction arrangement enables the oxygen to rotate and flow along the inner wall of the mixing chamber 3 to form a vortex, thereby enhancing the mixing effect of oxygen and return air gas and ensuring uniform mixing. The exhaust pipe 33 is close to the second bottom surface 36 and is arranged on the side 35 of the mixing chamber 3 perpendicular to the axial direction of the mixing chamber 3. This vertical arrangement enables the mixed gas to be smoothly discharged from the mixing chamber 3 and enter the air supply module 4 through the air supply pipe 9. The exhaust pipe 33 is arranged on the side 35, so that the mixed gas is not discharged along the axis of the mixing chamber 3, thereby increasing the mixing time of oxygen and return air gas. In the gas mixing chamber, the gas can be further fully mixed due to vortices and multiple collisions during the flow process, which can ensure that the discharged gas is mixed more evenly and improve the gas stability and mixing effect of the system.

[0039] The air supply module 4 includes a main air supply port 41 connected to the air supply pipe 8 at the top of the cabin body. The main air supply port 41 is connected to a plurality of annularly arranged air supply branches 43 through a straight air duct 42. The air supply branch 43 extends from the top of the cabin body 1 along the side wall to the middle and lower side. A plurality of air supply terminals 44 are arranged on the side facing the cabin. The design of the air supply module 4 utilizes a combination of straight and annular air ducts, which effectively expands the coverage of the air supply in the cabin. The arrangement from the top to the side wall and then to the middle and lower side helps to quickly balance the air in the vertical and horizontal directions. The air supply terminal 44 can be a perforated plate, a diffuser or a grille air outlet. These designs help to improve the uniformity of air flow, ensure that the air can be effectively distributed to every corner of the cabin, and optimize the airflow organization in the cabin.

[0040] The cabin body 1 includes a rest area 13 and a work area 14, and the rest area 13 and the work area 14 are separated by a partition 15. This design makes reasonable use of the space in the cabin and helps to control the gas environment of different functional areas relatively independently. The rest area 13, as a more frequent and long-lasting activity area for staff, is larger than the work area 14, and multiple bed boards are provided, on which staff can lie to rest or sleep. This embodiment is applicable to cabins with the shape of cylinders, cuboids, spheres and their derivatives. The first radiator 10 is located in the work area 14, and the second radiator 11 is provided in the rest area 13. The second radiator 11 is provided on the first bypass flow path 16 of the pipeline from the heat exchange medium in the first radiator 10 to the heat exchanger 27, and the first three-way valve 17 is provided at the inlet of the first bypass flow path 16. The first radiator 10 in the work area 14 is used to dissipate heat for the instruments in the work area, and can be equipped with a fan to ensure efficient heat dissipation. The second radiator 11 in the rest area 13 is used to adjust the living environment temperature of the personnel. Since the living environment does not necessarily require continuous cooling, the second radiator 11 is set on the bypass flow path. Through the control of the first three-way valve 17, the flow path can be switched according to actual needs, thereby determining whether the heat exchange medium flows through the second radiator 11. This design ensures that the system can flexibly adjust the temperature according to the needs of different areas, which can not only ensure the heat dissipation of the equipment in the working area, but also provide a comfortable living environment for personnel. The flow path of the heat exchange medium constitutes a cycle, and a delivery pump 12 is provided on the flow path to provide power. The heat exchange medium can be a medium such as ethylene glycol or propylene glycol.

[0041] A spiral heat exchange tube 20 is provided at the bottom of the liquid oxygen tank 21, and the spiral heat exchange tube 20 is provided on the second bypass flow path 18 of the pipeline from the heat exchange medium in the first radiator 10 to the heat exchanger 27. A second three-way valve 19 is provided at the inlet of the second bypass flow path 18, and the second bypass flow path 18 is located downstream of the first bypass flow path 16. When the liquid oxygen in the liquid oxygen tank 21 is less, it is not easy to flow out smoothly. At this time, the heat of the heat exchange medium can be used to heat the liquid oxygen at the bottom through the spiral heat exchange tube 20 to help this part of the liquid oxygen to be discharged smoothly. Since this heating is only required when the liquid oxygen tank 21 needs to discharge the bottom liquid oxygen, the spiral heat exchange tube 20 is provided on the bypass flow path, and this process is realized by controlling the switch of the second three-way valve 19. A liquid level sensor is provided in the liquid oxygen tank 21, and the liquid level sensor is connected to the controller. When the liquid level sensor detects that the liquid level in the liquid oxygen tank 21 is lower than the liquid level threshold, the controller controls the second three-way valve 19 to switch to the second bypass flow path 18.

[0042] The return air duct 7 is provided with a first fan 71 and an air treatment device 72. The first fan 71 is used to provide sufficient airflow so that the return air gas can smoothly pass through the return air duct 7 into the mixing chamber 3, ensuring the continuity and stability of the airflow. The air treatment device 72 is used to filter and purify the return air gas, remove impurities and pollutants in the gas, ensure the cleanliness of the gas entering the mixing chamber 3, and further improve the safety and reliability of the system. By providing the first fan 71 and the air treatment device 72, not only can the airflow be effectively controlled, but also the gas quality can be ensured, providing a safer and more stable cabin environment.

[0043] Furthermore, a plurality of oxygen concentration meters are evenly arranged in the cabin body 1 to monitor the oxygen concentration in the cabin body 1. The oxygen concentration meters are connected to the controller, and through the data feedback of these sensors, the controller can adjust the system parameters in real time based on the average value of the oxygen concentration to ensure that the oxygen concentration in the cabin body 1 is always in a stable state, thereby ensuring the safety and comfort of the diver.

[0044] The bottom of the cabin body 1 is also provided with an air diffusion assembly that can move back and forth. The bottom of the shell of the air diffusion assembly is provided with a roller. A fan is provided inside the shell of the air diffusion assembly, and its air inlet is located on the side of the shell, and the air outlet is located on the upper part of the shell. The air diffusion assembly can achieve smooth back and forth movement through the roller, and can evenly distribute the gas at the bottom of the cabin body 1 to ensure that the gas concentration and air pressure in each area of ​​the cabin remain consistent. The gas in the saturation diving chamber is usually a mixture of helium and oxygen. Since the density of oxygen is relatively large relative to that of helium, this physical property makes it easy for oxygen to deposit at the bottom of the cabin in a high-pressure chamber. The stratification phenomenon caused by this density further exacerbates the problem of uneven oxygen distribution. The air diffusion assembly inhales gas through the air inlet on the side, and evenly distributes the gas to the cabin through the air outlet on the upper part of the shell, effectively improving the fluidity and uniformity of the air in the cabin.

[0045] The second bottom surface 36 of the mixing chamber 3 is made of a flexible material, specifically a silicone material, and the second bottom surface 36 is sealed and connected to the side surface 35 of the mixing chamber 3. The silicone material can effectively absorb and alleviate the impact of airflow, reduce vibration and noise, and improve the stability of the system and the quietness of operation. A spiral heating coil 37 is provided near the inner wall of the middle section of the mixing chamber 3. Through the spiral design and the vortex shape of the gas, when it is necessary to heat and raise the temperature of oxygen or air, the heating coil 37 can evenly heat the gas inside the mixing chamber 3 to ensure uniform distribution of the gas temperature.

[0046] See also Figure 6 Another embodiment of the present invention discloses an oxygen supply system and an oxygen supply method based on the above-mentioned saturated pressurized cabin, comprising the following steps:

[0047] S1, when the oxygen concentration in the cabin body 1 is lower than the oxygen concentration threshold and the liquid level sensor detects that the liquid level is higher than the liquid level threshold, the liquid oxygen tank 21 starts to supply oxygen, and the controller controls the first valve 25 to open, and the second valve 26 remains closed. In this step, the system preferentially uses the liquid oxygen tank 21 to provide oxygen, because the liquid level in the liquid oxygen tank 21 is high enough to ensure continuous oxygen supply. The controller achieves this operation by opening the first valve 25, while keeping the second valve 26 closed to avoid wasting oxygen in the oxygen cylinder 22.

[0048] S2, when the oxygen concentration in the cabin body 1 is lower than the oxygen concentration threshold and the liquid level sensor detects that the liquid level is lower than the liquid level threshold, the controller controls the second three-way valve 19 to switch to the second bypass flow path 18. In this step, since the liquid level in the liquid oxygen tank 21 is already low, the liquid level sensor detects this and notifies the controller, and the controller then switches the second three-way valve 19 to allow the heat exchange medium to flow through the spiral heat exchange tube 20 to heat the liquid oxygen at the bottom of the liquid oxygen tank 21, ensuring that the liquid oxygen can be discharged smoothly and continue to supply oxygen to the system.

[0049] S3, after the first predetermined time, when the oxygen concentration in the cabin body 1 is still lower than the oxygen concentration threshold, the oxygen cylinder 22 starts to supply oxygen, and the controller closes the first valve 25 and opens the second valve 26. If the oxygen concentration in the cabin body 1 still does not reach the threshold within the predetermined time, the system will automatically switch to the oxygen cylinder 22 for oxygen supply. The controller will close the first valve 25 to stop the oxygen supply from the liquid oxygen tank 21, and open the second valve 26 to start the oxygen cylinder 22 to ensure that the oxygen concentration in the cabin returns to a safe level.

[0050] S4, replace the liquid oxygen tank 21, and switch back to the liquid oxygen tank 21 for oxygen supply after the replacement is completed. When the liquid oxygen in the liquid oxygen tank 21 is completely exhausted, it needs to be replaced. After replacing the liquid oxygen tank 21, the system will switch back to the liquid oxygen tank 21 for oxygen supply, and the controller will control the first valve 25 to reopen and the second valve 26 to close to restore the priority oxygen supply state of the liquid oxygen tank 21. This step ensures the continuity and reliability of the oxygen supply system and avoids the risk of oxygen supply interruption. .

[0051] In addition, when oxygen supplementation is not required, the return air duct 7, the air supply duct 9 and the air supply module 4 can also work normally. The air can be driven by the first fan 71 and purified in the air treatment device 72 to ensure the cleanliness and quality of the air in the cabin body 1. If the pressure in the cabin is too high, the flow regulating valve of the exhaust pipe 33 can be opened to release the pressure. This means that the system not only works during the oxygen supplementation stage, but also maintains the stability of the cabin pressure during daily work. Through these designs, the system can effectively adjust the air pressure and air quality in the cabin body 1 under various working conditions to ensure the stability and safety of the environment.

[0052] In summary, the present invention provides a saturated pressurized cabin air pressure stabilization system, which realizes efficient and reliable oxygen supply by combining a dual oxygen source oxygen supply design of a liquid oxygen tank and an oxygen cylinder. While giving priority to the use of liquid oxygen tanks for oxygen supply, when the liquid level of the liquid oxygen tank is insufficient, it automatically switches to the oxygen cylinder for oxygen supply to ensure uninterrupted oxygen supply. The system uses the cold energy generated by liquid oxygen vaporization to provide refrigeration for the working area and living area in the cabin, dissipates heat for the working area equipment through the first radiator, and adjusts the temperature of the living area through the second radiator, thereby improving the comfort of the cabin environment. The intelligent control system combines liquid level sensors and valve controls to monitor and adjust the oxygen supply status in real time to ensure uniform distribution of oxygen and stable operation of the system. The present invention not only improves the safety and comfort of divers in saturation diving operations, but also plays an important role in promoting the development of deep-sea operations and saturation diving industries by optimizing resource utilization and improving system efficiency, and has important application value and market prospects.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oxygen supply system for a saturated pressurized cabin, characterized in that: The invention comprises a cabin body (1), an oxygen supply device (2), a mixing chamber (3), an air supply module (4), an air return port (5), an air exhaust port (6) and a controller. The oxygen supply device (2) comprises a liquid oxygen tank (21) and an oxygen bottle (22). The liquid oxygen tank (21) and the oxygen bottle (22) are connected to the mixing chamber (3) through a first oxygen supply pipe (23) and a second oxygen supply pipe (24), respectively. The first oxygen supply pipe (23) and the second oxygen supply pipe (24) are respectively provided with a first valve. (25) and a second valve (26), the oxygen supply device (2) also includes a heat exchanger (27), a liquid oxygen channel (28) and a heat exchange medium channel (29) are arranged inside the heat exchanger (27), both ends of the liquid oxygen channel (28) are connected to the first oxygen supply pipe (23), the liquid oxygen flowing out of the liquid oxygen tank (21) is heat exchanged with the heat exchange medium in the liquid oxygen channel (28) to become gaseous oxygen and then flows into the mixing chamber (3), the two ends of the heat exchange medium channel (29) are connected to the two ends of the first radiator (10) through a pipeline, the return air port (5) is connected to the mixing chamber (3) through a return air pipe (7), the mixing chamber (3) is connected to the air supply module (4) through an air supply pipe (8), the return air port (5) is also connected to the exhaust port (6) through an exhaust pipe (9), the first valve (25) and the second valve (26) are both connected to the controller; a spiral heat exchange tube is arranged at the bottom of the liquid oxygen tank, and the spiral heat exchange tube is arranged at the first radiator The heat exchange medium in (10) flows back to the second bypass flow path (18) of the pipeline of the heat exchanger (27), and a second three-way valve (19) is arranged at the inlet of the second bypass flow path (18). The second bypass flow path (18) is located downstream of the first bypass flow path (16). A liquid level sensor is arranged in the liquid oxygen tank, and the liquid level sensor is connected to the controller. When the liquid level is lower than the liquid level threshold, the controller controls the second three-way valve (19) to switch to the second bypass flow path (18).

2. The oxygen supply system of the saturated pressurized cabin according to claim 1, characterized in that: The mixing chamber (3) is a cylindrical cavity, and an outer wall thereof is provided with a return air intake pipe (31), an oxygen intake pipe (32) and an exhaust pipe (33). The return air intake pipe (31) is arranged at the center of a first bottom surface (34) along the axial direction of the mixing chamber (3), the oxygen intake pipe (32) is arranged on a side surface (35) of the mixing chamber (3) close to the first bottom surface (34) and along the tangent direction of the circumference of the mixing chamber (3), and the exhaust pipe (33) is arranged close to the first bottom surface (34). The second bottom surface (36) is arranged on a side surface (35) of the mixing chamber (3) perpendicular to the axial direction of the mixing chamber (3); the return air port (5) is connected to the return air intake pipe (31) of the mixing chamber (3) through the return air pipe (7); the first oxygen supplementation pipe (23) and the second oxygen supplementation pipe (24) are merged and connected to the oxygen intake pipe (32) of the mixing chamber (3); the exhaust pipe (33) of the mixing chamber (3) is connected to the air supply module (4) through the air supply pipe (8).

3. The oxygen supply system of the saturated pressurized cabin according to claim 2, characterized in that: The air supply module comprises a main air supply port (41) connected to an air supply pipe (8) arranged on the top of the cabin body (1); the main air supply port (41) is connected to a plurality of annularly arranged air supply branches (43) through a straight air duct (42) on the top of the cabin body (1); the air supply branches (43) extend from the top of the cabin body (1) along the side wall to the middle and lower side of the cabin body (1); and the air supply branches (43) are provided with a plurality of air supply terminals (44) on one side facing the cabin body (1).

4. The oxygen supply system of the saturated pressurized cabin according to claim 3, characterized in that: The cabin body (1) comprises a rest area (13) and a work area (14), wherein the rest area (13) and the work area (14) are separated by a partition (15), the first radiator (10) is located in the work area (14), a second radiator (11) is arranged in the rest area (13), the second radiator (11) is arranged on a first bypass flow path (16) of a pipeline for returning heat exchange medium in the first radiator (10) to a heat exchanger (27), and a first three-way valve (17) is arranged at the inlet of the first bypass flow path (16).

5. The oxygen supply system of the saturated pressurized cabin according to claim 4, characterized in that: The return air duct (7) is provided with a first fan (71) and an air treatment device (72).

6. The oxygen supply system for a saturated pressurized cabin according to claim 5, characterized in that: The bottom of the cabin body (1) is also provided with an air diffusion component that can move back and forth, the bottom of the shell of the air diffusion component is provided with a roller, and a fan is provided inside the shell of the air diffusion component, the air inlet of which is located on the side of the shell, and the air outlet is located on the upper part of the shell.

7. The oxygen supply system for a saturated pressurized cabin according to claim 6, characterized in that: The second bottom surface (36) of the mixing chamber (3) is made of a flexible material, and the second bottom surface (36) is sealed to the side surface (35) of the mixing chamber (3). A spiral heating coil (37) is provided in the middle section of the mixing chamber (3) near the inner wall.

8. An oxygen supply method based on the oxygen supply system of the saturated pressurized cabin according to claim 7, characterized in that: The following steps are involved: S1, when the oxygen concentration in the cabin body (1) is lower than the oxygen concentration threshold and the liquid level sensor detects that the liquid level is higher than the liquid level threshold, the liquid oxygen tank (21) supplies oxygen, the controller controls the first valve (25) to open, and the second valve (26) to remain closed; S2, when the oxygen concentration in the cabin body (1) is lower than the oxygen concentration threshold and the liquid level sensor detects that the liquid level is lower than the liquid level threshold, the controller controls the second three-way valve (19) to switch to the second bypass flow path (18); S3, after the first predetermined time, when the oxygen concentration in the cabin body (1) is still lower than the oxygen concentration threshold, the oxygen cylinder (22) supplies oxygen, the controller closes the first valve (25) and opens the second valve (26); S4, replacing the liquid oxygen tank (21), and switching back to the liquid oxygen tank (21) for oxygen supply after the replacement is completed.

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