Air conditioning system in cavity

Abstract

The invention discloses a chamber interior air conditioning system which comprises a chamber, a first air inlet mechanism, a first air inlet pipeline, a carbon dioxide removing mechanism, a second air inlet pipeline, an exhaust pipeline, a first communicating valve and a second communicating valve. The carbon dioxide removal mechanism comprises a first carbon dioxide adsorption and desorption tower and a second carbon dioxide adsorption and desorption tower which are used for alternately adsorbing and desorbing carbon dioxide, and the chamber is communicated with a gas outlet pipeline and a gas return pipeline; the first communicating valve is used for selectively communicating the second gas inlet pipeline and the gas outlet pipeline with the first carbon dioxide adsorption and desorption tower and the second carbon dioxide adsorption and desorption tower in pairs; and the second communicating valve is used for selectively communicating the gas exhaust pipeline and the gas return pipeline with the first carbon dioxide adsorption and desorption tower and the second carbon dioxide adsorption and desorption tower in pairs. The air conditioning system in the chamber not only can meet the requirement for maintaining the qualified carbon dioxide content in the chamber, but also can meet the requirement for maintaining the qualified pressure in the chamber.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology in fully enclosed or semi-enclosed spaces, and specifically to an air conditioning system for a cavity. Background Technology

[0002] Currently, in scenarios such as high-altitude pressurized chambers, aerospace, marine environments, mines, and disaster evacuation, personnel often need to survive for extended periods in completely or semi-sealed enclosures. To maintain normal human metabolism, it is essential to ensure a stable oxygen concentration in the air, while simultaneously maintaining a carbon dioxide concentration below the human tolerance limit.

[0003] The existing technologies mainly include the following types of solutions: External fresh air input: Oxygen supply and carbon dioxide dilution are achieved through high-volume fresh air replacement. This method is energy-intensive, relies on external air supply, and is not feasible if the environment lacks air sources (such as the deep sea or underground). Independent oxygen generator: Oxygen is generated by pressure swing adsorption (PSA) or membrane separation, but such devices often only solve the oxygen supply problem and do not integrate carbon dioxide removal function, such as the four-season ecological sports oxygen chamber disclosed in the existing Chinese patent application document with application number CN201610840809.4. Carbon dioxide adsorption devices: These devices use chemical adsorbents (such as lithium hydroxide cylinders and solid amine adsorption beds) to adsorb carbon dioxide. However, common problems include high energy consumption for adsorbent regeneration, waste of waste heat, and low operating efficiency.

[0004] Chinese patent application CN201210277870.4 discloses an oxygen chamber-type gym air conditioning system and its operating method. This system includes: an oxygen chamber-type gym, a central air conditioning fresh air supply duct, an air purification system, an air sterilization and filtration device, an oxygen generator, an oxygen delivery device, a carbon dioxide downdraft system, and a negative ion generator. When the oxygen meter measures an oxygen content ≤22%, the oxygen generator starts working and delivers oxygen to the gym; when the oxygen meter measures an oxygen content ≥30%, the oxygen generator stops working. When the carbon dioxide meter measures a carbon dioxide content <3%, the carbon dioxide downdraft system stops working; when the carbon dioxide meter measures a carbon dioxide content >3%, ≥5%, or ≥6%, the exhaust fan in the carbon dioxide downdraft system operates at its low, medium, and high speeds, respectively. The oxygen chamber gym air conditioning system uses a downdraft system to exhaust carbon dioxide from the room to the outside, thus maintaining the carbon dioxide content in the room within an appropriate range. However, by directly exhausting carbon dioxide through a downdraft system, the carbon dioxide will mix with the air in the room and be carried out. For fully enclosed or semi-enclosed chambers, this will greatly affect the pressure inside the chamber, making it difficult to meet the requirements for maintaining a qualified pressure inside the chamber. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an indoor air conditioning system that can meet both the requirements of maintaining a qualified carbon dioxide content in the chamber and the requirements of maintaining a qualified pressure in the chamber.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An indoor air conditioning system includes a chamber, a first air intake mechanism, a first air intake pipe, a carbon dioxide removal mechanism, a second air intake pipe, an exhaust pipe, a first connecting valve, and a second connecting valve. The first air intake mechanism is connected to the chamber via the first air intake pipe. The carbon dioxide removal mechanism includes a first carbon dioxide removal tower and a second carbon dioxide removal tower for alternating carbon dioxide removal. The chamber is connected to an exhaust pipe and a return pipe. The first connecting valve is used to selectively connect the second air intake pipe and the exhaust pipe to the first carbon dioxide removal tower and the second carbon dioxide removal tower in pairs. The second connecting valve is used to selectively connect the exhaust pipe and the return pipe to the first carbon dioxide removal tower and the second carbon dioxide removal tower in pairs.

[0007] As a further improvement to the above technical solution: An exhaust fan is installed on the exhaust pipe, and an intake fan is installed on the second intake pipe.

[0008] The second intake pipe is connected to the exhaust pipe by a connecting pipe. The connecting pipe is equipped with a first one-way valve to prevent airflow from the second intake pipe to the exhaust pipe. The air intake fan is located between the connecting pipe and the first connecting valve.

[0009] The exhaust pipe is equipped with a first valve, and the exhaust pipe between the first valve and the second connecting valve is connected to the connecting pipe.

[0010] The first intake pipe is equipped with a first heat exchanger, and the second intake pipe passes through the first heat exchanger.

[0011] The exhaust pipe is equipped with a second heat exchanger, and the second intake pipe passes through the second heat exchanger.

[0012] The first intake pipe is equipped with a first filter and a second one-way valve to prevent backflow of intake air.

[0013] The first air intake mechanism includes an air intake pump and a second filter, wherein the air intake pump is connected to the second filter and the first air intake pipeline.

[0014] The air conditioning system in the chamber also includes an oxygen generating mechanism. The chamber is connected to an oxygen inlet pipeline. The oxygen generating mechanism is connected to the oxygen inlet pipeline and the first air inlet pipeline. The oxygen inlet pipeline is equipped with an oxygen storage tank, a pressure reducing valve, a flow meter, and an oxygen inlet valve.

[0015] The oxygen generating mechanism includes a third connecting valve, and a first and a second nitrogen adsorption / desorption tower for alternating nitrogen adsorption / desorption. A first branch pipe is provided on the second inlet pipe, and a second branch pipe is provided on the first inlet pipe. The third connecting valve is used to selectively connect the first and second branch pipes to the first and second nitrogen adsorption / desorption towers respectively. The oxygen outlets of the first and second nitrogen adsorption / desorption towers are respectively connected to the inlet pipes via oxygen outlet pipes. An oxygen outlet valve is provided on the oxygen outlet pipes, and a third one-way valve is provided on the first branch pipe to prevent airflow from the second inlet pipe to the third connecting valve.

[0016] The chamber is connected to a negative oxygen ion generator, which is connected to the first air intake mechanism via a fourth connecting valve.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The chamber air conditioning system of this invention comprises a chamber, an outlet pipe, a first or second carbon dioxide adsorption / removal tower, and a return pipe, which are sequentially connected to form a carbon dioxide removal circuit. This allows air in the chamber to pass through the first or second carbon dioxide adsorption / removal tower to remove carbon dioxide before returning to the chamber. On one hand, this reduces the carbon dioxide content in the chamber, meeting the requirement of maintaining a qualified carbon dioxide level. On the other hand, because the outflowing air returns to the chamber after carbon dioxide removal, air loss from the chamber is reduced, thus minimizing the impact on the chamber pressure. Combined with the first intake mechanism replenishing the chamber with air through the first intake pipe, the chamber pressure can be maintained within the required range, meeting the requirement of maintaining a qualified pressure. In other words, this chamber air conditioning system can meet both the requirements of maintaining a qualified carbon dioxide content and the requirements of maintaining a qualified pressure in the chamber.

[0018] The chamber air conditioning system of this invention comprises an intake fan, a first or second carbon dioxide removal tower, and a connecting pipe, which can form a circulation loop. Under the action of the intake fan, a circulating airflow is generated, achieving the effect of cyclically removing carbon dioxide from the first or second carbon dioxide removal tower. After a set time has elapsed since the first or second carbon dioxide removal tower removed carbon dioxide, the carbon dioxide is discharged through the exhaust pipe. This reduces the amount of external air required for the carbon dioxide removal process.

[0019] The chamber air conditioning system of this invention generates heat during operation of the first air intake mechanism, thereby increasing the temperature of the air passing through it. This temperature is higher than that of the gas entering through the second air intake pipe. Therefore, after heat exchange through the first heat exchanger, the temperature of the first air intake mechanism can be transferred to the second air intake pipe, further increasing the temperature of the gas entering the second air intake pipe. This facilitates the removal of carbon dioxide by the first and second carbon dioxide adsorption / removal towers (both of which can only remove carbon dioxide when heated to a set temperature), achieving the effect of waste heat utilization. Simultaneously, it cools the air entering the chamber through the first air intake pipe. Alternatively, a cooling device can be installed on the first air intake pipe to regulate the temperature of the air entering the chamber through it.

[0020] In the chamber air conditioning system of the present invention, since the first and second carbon dioxide adsorption towers can only remove carbon dioxide when heated to a set temperature, the air temperature discharged through the exhaust pipe is higher than the air temperature in the second intake pipe. Therefore, after heat exchange by the second heat exchanger, the temperature of the exhaust pipe can be transferred to the second intake pipe to increase the temperature of the gas entering the second intake pipe, which is beneficial for the first and second carbon dioxide adsorption towers to remove carbon dioxide and achieve the effect of waste heat utilization. At the same time, it has a cooling effect on the air discharged from the exhaust pipe. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the cavity air conditioning system of the present invention.

[0022] The labels in the diagram represent: 1. Chamber; 11. Outlet pipe; 111. Exhaust fan; 12. Return pipe; 13. Oxygen inlet pipe; 131. Oxygen storage tank; 132. Pressure reducing valve; 133. Flow meter; 134. Oxygen inlet valve; 14. Negative ion generator; 141. Fourth connecting valve; 2. First intake mechanism; 21. Intake pump; 22. Second filter; 3. First intake pipe; 31. First heat exchanger; 32. First filter; 33. Second one-way valve; 34. Second branch pipe; 4. Carbon dioxide removal mechanism; 41. 42. First carbon dioxide adsorption / removal tower; 5. Second carbon dioxide adsorption / removal tower; 6. Second air inlet pipe; 7. Air inlet fan; 8. Connecting pipe; 9. First check valve; 10. First branch pipe; 11. Third check valve; 12. Exhaust pipe; 13. First valve; 14. Second heat exchanger; 15. First connecting valve; 16. Second connecting valve; 17. Oxygen generating mechanism; 18. Third connecting valve; 19. First nitrogen adsorption / removal tower; 10. Second nitrogen adsorption / removal tower; 11. Oxygen outlet pipe; 12. Oxygen outlet valve. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Figure 1 An embodiment of the chamber air conditioning system of the present invention is shown. The chamber air conditioning system of this embodiment includes a chamber 1, a first air intake mechanism 2, a first air intake pipe 3, a carbon dioxide removal mechanism 4, a second air intake pipe 5, an exhaust pipe 6, a first connecting valve 7, and a second connecting valve 8. The first air intake mechanism 2 is connected to the chamber 1 through the first air intake pipe 3. The carbon dioxide removal mechanism 4 includes a first carbon dioxide removal tower 41 and a second carbon dioxide removal tower 42 for alternating carbon dioxide removal. The chamber 1 is connected to an exhaust pipe 11 and a return pipe 12. The first connecting valve 7 is used to selectively connect the second air intake pipe 5 and the exhaust pipe 11 to the first carbon dioxide removal tower 41 and the second carbon dioxide removal tower 42 in pairs. The second connecting valve 8 is used to selectively connect the exhaust pipe 6 and the return pipe 12 to the first carbon dioxide removal tower 41 and the second carbon dioxide removal tower 42 in pairs.

[0028] In this chamber air conditioning system, chamber 1, outlet pipe 11, first carbon dioxide removal tower 41 or second carbon dioxide removal tower 42, and return pipe 12 can be sequentially connected to form a carbon dioxide removal loop. This allows air in chamber 1 to pass through the first or second carbon dioxide removal tower 41 to remove carbon dioxide before returning to chamber 1. On one hand, this reduces the carbon dioxide content in chamber 1, meeting the requirement of maintaining a qualified carbon dioxide content. On the other hand, because the outflowing air returns to chamber 1 after carbon dioxide removal, air loss from chamber 1 is reduced, thus minimizing the impact on the pressure within chamber 1. Combined with the first intake mechanism 2 replenishing air to chamber 1 through the first intake pipe 3, the pressure within chamber 1 can be maintained within the required range, meeting the requirement of maintaining a qualified pressure within chamber 1. In other words, this chamber air conditioning system can meet both the requirements of maintaining a qualified carbon dioxide content and a qualified pressure within chamber 1.

[0029] Furthermore, the first connecting valve 7 is used to selectively connect the second inlet pipe 5 and the outlet pipe 11 to the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 in pairs. The second connecting valve 8 is used to selectively connect the exhaust pipe 6 and the return pipe 12 to the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 in pairs. This ensures that when the first carbon dioxide adsorption tower 41 is working to adsorb carbon dioxide in the carbon dioxide removal circuit, the second carbon dioxide adsorption tower 42 removes the adsorbed carbon dioxide through the inlet purging action of the second inlet pipe 5 and the exhaust action of the exhaust pipe 6. Alternatively, it ensures that when the second carbon dioxide adsorption tower 42 is working to adsorb carbon dioxide in the carbon dioxide removal circuit, the first carbon dioxide adsorption tower 41 removes the adsorbed carbon dioxide through the inlet purging action of the second inlet pipe 5 and the exhaust action of the exhaust pipe 6. This ensures that when one carbon dioxide adsorption tower is undergoing desorption and regeneration, the other carbon dioxide adsorption towers can still maintain normal adsorption operation.

[0030] Specifically, when the first connecting valve 7 connects the outlet pipe 11 to the first carbon dioxide adsorption tower 41 and the second inlet pipe 5 to the second carbon dioxide adsorption tower 42, the second connecting valve 8 connects the return pipe 12 to the first carbon dioxide adsorption tower 41 and the exhaust pipe 6 to the second carbon dioxide adsorption tower 42. At this time, the chamber 1, outlet pipe 11, first carbon dioxide adsorption tower 41, and return pipe 12 can be sequentially connected to form a carbon dioxide removal circuit for adsorbing and removing carbon dioxide from the circuit. The second inlet pipe 5, second carbon dioxide adsorption tower 42, and exhaust pipe 6 are sequentially connected to remove the carbon dioxide adsorbed in the second carbon dioxide adsorption tower 42, facilitating the re-adsorption and removal of carbon dioxide. Carbon adsorption; when the first connecting valve 7 connects the outlet pipe 11 to the second carbon dioxide adsorption tower 42 and the second inlet pipe 5 to the first carbon dioxide adsorption tower 41, the second connecting valve 8 connects the return pipe 12 to the second carbon dioxide adsorption tower 42 and the exhaust pipe 6 to the first carbon dioxide adsorption tower 41. At this time, the chamber 1, the outlet pipe 11, the second carbon dioxide adsorption tower 42 and the return pipe 12 can be connected in sequence to form a carbon dioxide removal circuit, which is used to adsorb and remove carbon dioxide in the circuit. The second inlet pipe 5, the first carbon dioxide adsorption tower 41 and the exhaust pipe 6 are connected in sequence to remove the carbon dioxide adsorbed in the first carbon dioxide adsorption tower 41, which is conducive to the adsorption and removal of carbon dioxide again.

[0031] Preferably, both the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 are solid amine adsorption towers equipped with heating devices, where the solid amine selectively adsorbs carbon dioxide. The saturated solid amine adsorption tower is heated by a heating device (electric heating tube or hot air heating), and carbon dioxide is released from the solid amine (adsorbent) by purging through the second air inlet pipe 5.

[0032] Furthermore, in this embodiment, an exhaust fan 111 is provided on the exhaust pipe 11, and an intake fan 51 is provided on the second intake pipe 5. The exhaust fan 111 can adjust the speed of air flowing out of the chamber 1 through the exhaust pipe 11, thereby adjusting the carbon dioxide removal speed. Of course, on / off valves can also be provided on the exhaust pipe 11 and / or the return pipe 12 to selectively open and close the exhaust pipe 11 and the return pipe 12. The intake fan 51 can adjust the purging air speed on the first carbon dioxide removal tower 41 and the second carbon dioxide removal tower 42, adjusting the purging speed to meet the time requirements for alternating use.

[0033] Furthermore, in this embodiment, the second intake pipe 5 and the exhaust pipe 6 are connected by a connecting pipe 52. The connecting pipe 52 is equipped with a first one-way valve 521 to prevent airflow from the second intake pipe 5 to the exhaust pipe 6. An intake fan 51 is located between the connecting pipe 52 and the first connecting valve 7. Thus, the intake fan 51, the first or second carbon dioxide adsorption / removal tower 41, and the connecting pipe 52 can form a circulation loop. Under the action of the intake fan 51, a circulating airflow can be formed, achieving the effect of cyclically removing carbon dioxide from the first or second carbon dioxide adsorption / removal tower 41 or 42. After a set time has elapsed since the first or second carbon dioxide adsorption / removal tower 41 removed carbon dioxide, the carbon dioxide is discharged through the exhaust pipe 6. This reduces the amount of external air required for the carbon dioxide removal process.

[0034] Furthermore, in this embodiment, the exhaust pipe 6 is equipped with a first valve 61, and the exhaust pipe 6 between the first valve 61 and the second connecting valve 8 is connected to the connecting pipe 52. The first valve 61 can be closed, so that the air intake fan 51, the first carbon dioxide adsorption tower 41 or the second carbon dioxide adsorption tower 42, and the connecting pipe 52 can form a circulation loop. Under the action of the air intake fan 51, a circulating airflow can be formed to achieve the effect of cyclically removing carbon dioxide from the first carbon dioxide adsorption tower 41 or the second carbon dioxide adsorption tower 42. After the first carbon dioxide adsorption tower 41 or the second carbon dioxide adsorption tower 42 has removed carbon dioxide for a set time, the first valve 61 is opened again, and carbon dioxide is discharged through the exhaust pipe 6. Of course, on / off valves can be installed on the connecting pipe 52 and the second air intake pipe 5 (the side of the second air intake pipe 5 facing the air intake end relative to the connecting pipe 52).

[0035] Furthermore, in this embodiment, a first heat exchanger 31 is provided on the first air intake pipe 3, and the second air intake pipe 5 passes through the first heat exchanger 31. The first heat exchanger 31 is used to transfer and exchange heat between the first air intake pipe 3 and the second air intake pipe 5. Since the first air intake mechanism 2 generates heat during operation, thereby increasing the temperature of the air passing through it, which is relatively higher than the temperature of the gas entering the second air intake pipe 5, the heat exchanger 31 can transfer the temperature of the first air intake mechanism 2 to the second air intake pipe 5 to increase the temperature of the gas entering the second air intake pipe 5. This facilitates the removal of carbon dioxide by the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 (the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 can only remove carbon dioxide when heated to a set temperature), and achieves the effect of waste heat utilization. At the same time, it has a cooling effect on the air entering the chamber 1 through the first air intake pipe 3. Of course, a cooling device can also be installed on the first air intake pipe 3 to regulate the temperature of the air entering the chamber 1 through the first air intake pipe 3.

[0036] Furthermore, in this embodiment, a second heat exchanger 62 is provided on the exhaust pipe 6, and the second intake pipe 5 passes through the second heat exchanger 62. The second heat exchanger 62 is used to transfer and exchange heat between the exhaust pipe 6 and the second intake pipe 5. Since the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 can only remove carbon dioxide when heated to a set temperature, the temperature of the air discharged through the exhaust pipe 6 is higher than the temperature of the air in the second intake pipe 5. Therefore, after the heat exchange through the second heat exchanger 62, the temperature of the exhaust pipe 6 can be transferred to the second intake pipe 5 to increase the temperature of the gas entering the second intake pipe 5, which is beneficial for the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42 to remove carbon dioxide and achieve the effect of waste heat utilization. At the same time, it has a cooling effect on the air discharged from the exhaust pipe 6.

[0037] Furthermore, in this embodiment, the first intake pipe 3 is provided with a first filter 32 and a second one-way valve 33 for preventing backflow of intake air.

[0038] Furthermore, in this embodiment, the first air intake mechanism 2 includes an air intake pump 21 and a second filter 22, with the air intake pump 21 connected to the second filter 22 and the first air intake pipe 3. The air intake pump 21 generates heat during operation, thereby increasing the temperature of the passing air.

[0039] Furthermore, in this embodiment, the air conditioning system within the chamber also includes an oxygen generating mechanism 9. The chamber 1 is connected to an oxygen inlet pipe 13. The oxygen generating mechanism 9 connects the oxygen inlet pipe 13 to the first air inlet pipe 3. The oxygen inlet pipe 13 is equipped with an oxygen storage tank 131, a pressure reducing valve 132, a flow meter 133, and an oxygen inlet valve 134. The first air inlet mechanism 2, the oxygen generating mechanism 9, and the oxygen inlet pipe 13 are connected to form a pipeline for supplying oxygen to the chamber 1, which can regulate the oxygen content of the chamber 1. The oxygen generating mechanism 9 and the first air inlet pipe 3 share a single first air inlet mechanism 2 (air pump 21), reducing manufacturing costs.

[0040] Furthermore, in this embodiment, the oxygen generating mechanism 9 includes a third connecting valve 91, and a first nitrogen removal tower 92 and a second nitrogen removal tower 93 for alternating nitrogen removal. A first branch pipe 53 is provided on the second air inlet pipe 5, and a second branch pipe 34 is provided on the first air inlet pipe 3. The third connecting valve 91 is used to selectively connect the first branch pipe 53 and the second branch pipe 34 to the first nitrogen removal tower 92 and the second nitrogen removal tower 93 in pairs. The oxygen outlet ends of the first nitrogen removal tower 92 and the second nitrogen removal tower 93 are respectively connected to the oxygen inlet pipe 13 through the oxygen outlet pipe 94. An oxygen outlet valve 941 is provided on the oxygen outlet pipe 94, and a third one-way valve 531 is provided on the first branch pipe 53 to prevent airflow from the second air inlet pipe 5 to the third connecting valve 91.

[0041] The third connecting valve 91 is used to selectively connect the first branch pipe 53 and the second branch pipe 34 to the first nitrogen adsorption / desorption tower 92 and the second nitrogen adsorption / desorption tower 93 in pairs. When the third connecting valve 91 selects to connect the second branch pipe 34 to the first nitrogen adsorption / desorption tower 92 and the first branch pipe 53 to the second nitrogen adsorption / desorption tower 93, the oxygen outlet valve 941 at the oxygen outlet end of the first nitrogen adsorption / desorption tower 92 opens, and the oxygen outlet valve 941 at the oxygen outlet end of the second nitrogen adsorption / desorption tower 93 closes. At this time, the first nitrogen adsorption / desorption tower 92 adsorbs the air passing through it. The nitrogen in chamber 1 is used to produce oxygen. The second nitrogen adsorption tower 93 desorbs the adsorbed nitrogen and connects the desorbed nitrogen to the second air inlet pipe 5 through the first branch pipe 53. On the one hand, it increases the air supply of the second air inlet pipe 5 to the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42, which is beneficial for purging and desorbing carbon dioxide. On the other hand, the addition of nitrogen to the second air inlet pipe 5 can reduce the oxygen content, which is beneficial for improving the life of the first carbon dioxide adsorption tower 41 and the second carbon dioxide adsorption tower 42.

[0042] When the third connecting valve 91 connects the second branch pipe 34 to the second nitrogen adsorption / desorption tower 93 and the first branch pipe 53 to the first nitrogen adsorption / desorption tower 92, the oxygen outlet valve 941 at the oxygen outlet end of the second nitrogen adsorption / desorption tower 93 opens, and the oxygen outlet valve 941 at the oxygen outlet end of the first nitrogen adsorption / desorption tower 92 closes. At this time, the second nitrogen adsorption / desorption tower 93 adsorbs nitrogen from the air to produce oxygen in chamber 1. The first nitrogen adsorption / desorption tower 92 desorbs the adsorbed nitrogen and connects the desorbed nitrogen to the second air inlet pipe 5 through the first branch pipe 53, increasing the air supply from the second air inlet pipe 5 to the first carbon dioxide adsorption / desorption tower 41 and the second carbon dioxide adsorption / desorption tower 42, which is beneficial for purging and desorbing carbon dioxide. In this way, oxygen production is achieved by the alternating adsorption / desorption of the first nitrogen adsorption / desorption tower 92 and the second nitrogen adsorption / desorption tower 93.

[0043] Furthermore, in this embodiment, the chamber 1 is connected to a negative oxygen ion generator 14, which is connected to the first air intake mechanism 2 via a fourth connecting valve 141. The negative oxygen ion generator 14 causes the passing air to contain an appropriate amount of negative oxygen ions. The air containing an appropriate amount of negative oxygen ions enters the chamber 1, which can improve the breathing comfort of the human body in the chamber 1. The negative oxygen ion generator 14, the oxygen generating mechanism 9, and the first air intake pipe 3 share a first air intake mechanism 2 (air intake pump 21), which further reduces manufacturing costs.

[0044] The second branch pipe 34 can be equipped with an on / off valve, allowing the first air intake mechanism 2 to selectively supply and cut off air to the oxygen generating mechanism 9. Alternatively, the second branch pipe 34 can also selectively supply air to either the oxygen generating mechanism 9 or the negative ion generator 14, or simultaneously supply and cut off air to both, via the fourth connecting valve 141. An on / off valve can also be installed between the negative ion generator 14 and the chamber 1.

[0045] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. An air conditioning system for a cavity, characterized in that: The chamber (1), the first air inlet mechanism (2), the first air inlet pipeline (3), the carbon dioxide removal mechanism (4), the second air inlet pipeline (5), the exhaust pipeline (6), the first communication valve (7) and the second communication valve (8), the first air inlet mechanism (2) is communicated with the chamber (1) through the first air inlet pipeline (3), the carbon dioxide removal mechanism (4) includes the first carbon dioxide adsorption and desorption auxiliary tower (41) and the second carbon dioxide adsorption and desorption auxiliary tower (42) for alternately adsorbing and desorbing carbon dioxide, the chamber (1) is communicated with the gas outlet pipeline (11) and the gas return pipeline (12), the first communication valve (7) is used for selectively communicating the second air inlet pipeline (5) and the gas outlet pipeline (11) with the first carbon dioxide adsorption and desorption auxiliary tower (41) and the second carbon dioxide adsorption and desorption auxiliary tower (42), and the second communication valve (8) is used for selectively communicating the exhaust pipeline (6) and the gas return pipeline (12) with the first carbon dioxide adsorption and desorption auxiliary tower (41) and the second carbon dioxide adsorption and desorption auxiliary tower (42).

2. The in-cabin air conditioning system according to claim 1, characterized by: The air outlet fan (111) is arranged on the gas outlet pipeline (11), and the air inlet fan (51) is arranged on the second air inlet pipeline (5).

3. The in-cabin air conditioning system of claim 2, wherein: The second air inlet pipeline (5) is communicated with the exhaust pipeline (6) through the connecting pipeline (52), the first one-way valve (521) for preventing air flow from flowing from the second air inlet pipeline (5) to the exhaust pipeline (6) is arranged on the connecting pipeline (52), and the air inlet fan (51) is arranged between the connecting pipeline (52) and the first communication valve (7).

4. The in-cabin air conditioning system of claim 2, wherein: The first valve (61) is arranged on the exhaust pipeline (6), and the exhaust pipeline (6) between the first valve (61) and the second communication valve (8) is connected with the connecting pipeline (52).

5. The in-cabin air conditioning system of claim 1, wherein: The first heat exchanger (31) is arranged on the first air inlet pipeline (3), and the second air inlet pipeline (5) is arranged in the first heat exchanger (31).

6. The in-cabin air conditioning system of claim 1, wherein: The second heat exchanger (62) is arranged on the exhaust pipeline (6), and the second air inlet pipeline (5) is arranged in the second heat exchanger (62).

7. The in-cabin air conditioning system of claim 1, wherein: The first air inlet pipeline (3) is provided with the first filter (32) and the second one-way valve (33) for preventing air backflow, the first air inlet mechanism (2) includes the air inlet pump (21) and the second filter (22), and the air inlet pump (21) connects the second filter (22) with the first air inlet pipeline (3).

8. The in-cabin air conditioning system according to any one of claims 1 to 7, characterized by: The chamber air conditioning system further includes the oxygen production mechanism (9), the chamber (1) is connected with the oxygen inlet pipeline (13), the oxygen production mechanism (9) connects the oxygen inlet pipeline (13) with the first air inlet pipeline (3), and the oxygen inlet pipeline (13) is provided with the oxygen storage tank (131), the pressure reducing valve (132), the flow meter (133) and the oxygen inlet valve (134).

9. The in-cabin air conditioning system of claim 8, wherein: The oxygen production mechanism (9) comprises a third communication valve (91), and a first nitrogen adsorption and desorption tower (92) and a second nitrogen adsorption and desorption tower (93) for alternately adsorbing and desorbing nitrogen, a first branch pipe (53) is arranged on the second gas inlet pipeline (5), a second branch pipe (34) is arranged on the first gas inlet pipeline (3), the third communication valve (91) is used for selectively communicating the first branch pipe (53) and the second branch pipe (34) with the first nitrogen adsorption and desorption tower (92) and the second nitrogen adsorption and desorption tower (93) respectively, the oxygen outlet ends of the first nitrogen adsorption and desorption tower (92) and the second nitrogen adsorption and desorption tower (93) are connected with the oxygen inlet pipeline (13) through oxygen outlet pipes (94) respectively, an oxygen outlet valve (941) is arranged on the oxygen outlet pipe (94), and a third one-way valve (531) is arranged on the first branch pipe (53) and used for preventing gas flow from the second gas inlet pipeline (5) to the third communication valve (91).

10. The in-cabin air conditioning system of claim 8, wherein: The chamber (1) is connected with a negative oxygen ion machine (14), and the negative oxygen ion machine (14) is communicated with the first gas inlet mechanism (2) through a fourth communication valve (141).

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