Circulating system for near space environment and aerostat

Abstract

The invention belongs to the technical field of low-temperature heat exchange, and particularly relates to a circulating system for a near space environment and an aerostat, and the circulating system comprises an air inlet circulating module, a phase-change heat exchange module, a refrigerating and heating circulating module and a flow control module. The full contact between the phase change working medium and the phase change heat exchange module is realized through the air inlet circulation module. The liquefaction and vaporization process of a phase change working medium is achieved through the phase change heat exchange module, flow distribution of refrigerants in the first heat exchanger and the second heat exchanger is achieved through the flow control module, it is guaranteed that the refrigerants with the large flow flow flow through the first heat exchanger in the refrigeration mode, and it is guaranteed that the refrigerants with the large flow flow flow through the second heat exchanger in the heating mode. Rapid switching between a refrigeration mode and a heating mode is achieved through the working medium circulation module, so that the rapid liquefaction and vaporization process of the phase change working medium is achieved, finally buoyancy and height are regulated and controlled through large-volume change of the phase change working medium, and long-term stable flight of the stratospheric aerostat is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-temperature heat exchange, and in particular relates to a circulation system and an aerostat used in a near-space environment. Background Art

[0002] Near-space refers to the airspace 20 to 100 km from the ground. It has attracted widespread attention internationally due to its important development and application value. Aerostats can fly stably for a long time in this space, and have advantages that aviation and aerospace aerostats do not have, especially in communication support, intelligence collection, electronic suppression, early warning, and civil use. It is a global problem to achieve long-term stable airborne flight of aerostats in a near-space environment. The biggest advantage of aerostats is their potential long-term airborne time. However, so far, the existing technology has not really achieved long-term fixed-point airborne flight of stratospheric aerostats. The "superheat" and "overpressure" phenomena caused by day and night temperature changes are the primary obstacles to their long-term resident flight. During the day, due to the combined influence of direct solar radiation, ground reflected radiation, ground-air infrared radiation and other factors, the temperature of the gas inside the aerostat will be significantly higher than the temperature of the external atmosphere. If exhaust is not performed, the internal and external pressure difference may exceed the stress tolerance range of the skin, reducing the service life of the skin. At night, the temperature of the gas inside the airstat drops and the pressure decreases. In order to maintain the pressure, air needs to be filled in, which will increase the gravity of the airstat and reduce the net buoyancy, which will also affect the altitude maintenance.

[0003] Existing buoyancy control methods have fundamental defects and are essentially difficult to keep in the air for a long time. At present, aerostats mainly control their buoyancy through primitive means such as appropriate overpressure, deflation, and throwing heavy objects. Not only can they not effectively control the height, pressure, and buoyancy of the aerostat independently, but they also have a great negative impact on the long-term stay of the aerostat and the increase of its payload. Summary of the invention

[0004] The present invention provides a circulation system and an aerostat for a near-space environment, which are used to solve the defect in the prior art that the height, pressure and buoyancy of the aerostat cannot be independently and effectively controlled, realize active buoyancy regulation, do not exchange mass with the outside world, continuously and reversibly realize the phase change process of the internal working fluid through a thermal circulation device, and controllably realize the constant total buoyancy.

[0005] The present invention provides a circulation system and an aerostat for use in a near-space environment, comprising: An air intake circulation module, the air intake circulation module comprising a phase change airbag and a circulation fan, the phase change airbag is used to provide a phase change working medium, and an air inlet of the circulation fan is connected to the phase change airbag; A phase change heat transfer module, the phase change heat transfer module comprising a liquefaction chamber, a first heat exchanger, a liquid collecting chamber and a second heat exchanger, the liquefaction chamber being connected to the air outlet of the circulation fan and the phase change airbag; the first heat exchanger being arranged in the liquefaction chamber, the second heat exchanger being arranged in the liquid collecting chamber, the liquefaction chamber being connected to the liquid collecting chamber, and the first heat exchanger and the second heat exchanger being connected in parallel; A working medium circulation module, the working medium circulation module comprises a compressor unit, an air cooler and a throttling element; in a cooling mode, a high-pressure outlet of the compressor unit is connected to a high-pressure inlet of the air cooler; a high-pressure outlet of the first heat exchanger is connected to a high-pressure inlet of the air cooler; a high-pressure outlet of the air cooler is connected to a high-pressure inlet of the throttling element, and a low-pressure outlet of the throttling element is connected to an inlet of the first heat exchanger and an inlet of the second heat exchanger; in a heating mode, a high-pressure outlet of the compressor unit is connected to an inlet of the first heat exchanger and an inlet of the second heat exchanger; refrigerant outlets of the first heat exchanger and the second heat exchanger are connected to an inlet of the throttling element, and an outlet of the throttling element flows back to the compressor unit through the air cooler; The flow control module is used to control the flow distribution of the refrigerant in the first heat exchanger and the second heat exchanger.

[0006] A circulation system for a near-space environment provided according to the present invention also includes a control module for controlling the working fluid circulation module and the flow control module, so that the working fluid circulation module can switch between the cooling mode and the heating mode at any time when working.

[0007] According to a circulation system for a near-space environment provided by the present invention, the flow control module includes a first solenoid valve, a first end of the first solenoid valve is connected to the throttling element, a second end of the first solenoid valve is connected to the first heat exchanger, and a third end of the first solenoid valve is connected to the second heat exchanger.

[0008] According to a circulation system for a near-space environment provided by the present invention, the flow control module also includes a second solenoid valve, a first end of the second solenoid valve is connected to the compressor unit, a second end of the second solenoid valve is connected to the first heat exchanger, and a third end of the second solenoid valve is connected to the second heat exchanger.

[0009] According to a circulation system for a near-space environment provided by the present invention, the flow control module also includes a four-way solenoid valve, a first end of the four-way solenoid valve is connected to the first end of the second solenoid valve, a second end of the four-way solenoid valve is connected to the low-pressure inlet of the compressor unit, a third end of the four-way solenoid valve is connected to the high-pressure outlet of the compressor unit, and a fourth end of the four-way solenoid valve is connected to the air cooler.

[0010] According to a circulation system for a near-space environment provided by the present invention, the phase change heat transfer module further includes a liquid level gauge, and the liquid level gauge is in communication with the liquid collecting chamber.

[0011] According to a circulation system for a near-space environment provided by the present invention, the working medium circulation module also includes an air storage tank, and the air storage tank is arranged upstream of the inlet of the compressor unit.

[0012] According to a circulation system for a near-space environment provided by the present invention, the first heat exchanger and the second heat exchanger include one of a shell and tube heat exchanger, a jacketed heat exchanger, a plate heat exchanger, a plate-fin heat exchanger, and a spiral plate heat exchanger.

[0013] According to a circulation system for a near-space environment provided by the present invention, the refrigerant includes one of ethane and ethylene.

[0014] The present invention also provides an aerostat, comprising a circulation system for a near-space environment as described in any one of the above items.

[0015] The circulation system for near-space environment provided by the present invention provides phase change working fluid through a phase change airbag. The phase change working fluid enters the liquefaction chamber from the phase change airbag through a circulation fan. The working fluid that has not completed liquefaction returns to the phase change airbag through a pipeline to form a complete loop. The phase change working fluid is fully contacted with the phase change heat transfer module through the air intake circulation module.

[0016] The liquefaction and vaporization process of the phase change medium is realized through the phase change heat exchange module. In the cooling mode, the flow control module ensures that a large amount of refrigerant flows through the first heat exchanger to ensure that sufficient cooling capacity is provided when heat exchange is performed with the gaseous phase change medium, so that the gaseous phase change medium can be quickly liquefied. A small amount of refrigerant flows through the second heat exchanger to achieve supercooling and prevent the liquefied phase change medium from returning to the phase change airbag. In the heating mode, the flow control module ensures that a large amount of refrigerant flows through the second heat exchanger to ensure that sufficient heat can be provided when heat exchange is performed with the liquid phase change medium, so that the liquid phase change medium can be quickly vaporized. A small amount of refrigerant flows through the first heat exchanger to achieve superheating and prevent the liquefied phase change medium from returning to the liquid collection chamber.

[0017] The working fluid circulation module is used to realize rapid switching between the cooling mode and the heating mode, thereby realizing the rapid liquefaction and vaporization process of the phase change working fluid.

[0018] The aerostat provided by the present invention includes the above-mentioned circulation system for rapid liquefaction and vaporization in the near-space environment, and controls the buoyancy and altitude through the large volume change of the phase-change medium, thereby realizing long-term stable flight of the stratospheric aerostat. By controlling the flow distribution, rapid liquefaction and vaporization of the phase-change medium in the near-space environment can be realized, with a compact structure, small mass, simple process, and high efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or 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.

[0020] Figure 1 This is a working flow chart of the refrigeration mode of the circulation system for rapid liquefaction and vaporization in a near-space environment provided by the present invention.

[0021] Figure 2 This is a working flow chart of the heating mode of the circulation system for rapid liquefaction and vaporization in a near-space environment provided by the present invention.

[0022] Reference numerals: 1. Phase change airbag; 2. Circulating fan; 3. Liquefaction chamber; 4. First heat exchanger; 5. Liquid collecting chamber; 6. Second heat exchanger; 7. Compressor unit; 8. Air cooler; 9. Throttling element; 10. First solenoid valve; 11. Second solenoid valve; 12. Four-way solenoid valve; 13. Liquid level gauge; 14. Gas storage tank. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] Combine the following Figure 1-Figure 2 A circulation system of the present invention for use in a near space environment is described.

[0026] A circulation system for a near-space environment provided in an embodiment of the present invention includes an air intake circulation module, a phase change heat transfer module, a cooling and heating circulation module, and a flow control module.

[0027] Among them, the air intake circulation module includes a phase change airbag 1, a circulating fan 2 and a connecting pipeline. The phase change airbag 1 is used to provide phase change working fluid, and the air inlet of the circulating fan 2 is connected to the phase change airbag 1; the phase change working fluid enters the liquefaction chamber 3 from the phase change airbag 1 through the circulating fan 2, and the working fluid that has not completed liquefaction returns to the phase change airbag 1 through the pipeline to form a complete circuit.

[0028] The phase change heat exchange module includes a liquefaction chamber 3, a first heat exchanger 4, a liquid collecting chamber 5, a second heat exchanger 6 and a connecting pipeline. The air outlet of the circulating fan 2 and the liquefaction chamber 3 are both connected to the phase change airbag 1; the first heat exchanger 4 is arranged in the liquefaction chamber 3, the second heat exchanger 6 is arranged in the liquid collecting chamber 5, the liquefaction chamber 3 and the liquid collecting chamber 5 are connected, and the first heat exchanger 4 and the second heat exchanger 6 are connected in parallel.

[0029] In the refrigeration mode, the phase change working medium enters the liquefaction chamber 3 through the circulating fan 2 and exchanges heat with the first heat exchanger 4. The cooled phase change working medium will condense, and the liquid phase change working medium will enter the liquefaction chamber 3 and exchange heat with the second heat exchanger 6 at the same time to achieve re-cooling, preventing the phase change working medium from vaporizing back to the phase change airbag 1, and the liquid phase change working medium will drip into the liquid collecting chamber 5.

[0030] In the heating mode, the liquid phase change medium is heated and vaporized after heat exchange with the second heat exchanger 6, and the density of the gaseous phase change medium decreases. It leaves the liquid collecting chamber 5 and enters the liquefaction chamber 3, and continues to exchange heat with the first heat exchanger 4 in the liquefaction chamber 3 to achieve superheating, and finally returns to the phase change airbag 1 through the pipeline.

[0031] The working medium circulation module comprises a compressor unit 7 , an air cooler 8 and a throttling element 9 .

[0032] In the cooling mode, the high-pressure refrigerant outlet of the compressor unit 7 is connected to the high-pressure inlet of the air cooler 8; the high-pressure refrigerant outlet of the first heat exchanger 4 is connected to the high-pressure inlet of the air cooler 8; the high-pressure refrigerant outlet of the air cooler 8 is connected to the high-pressure refrigerant inlet of the throttling element 9, and the low-pressure refrigerant outlet of the throttling element 9 is connected to the refrigerant inlets of the first heat exchanger 4 and the second heat exchanger 6. The low-pressure refrigerant outlets of the first heat exchanger 4 and the second heat exchanger 6 are connected to the low-pressure refrigerant inlet of the compressor unit 7, forming a complete circuit: A→B (C)→E (D)→F→G→H→I→J→A.

[0033] In the heating mode, the high-pressure refrigerant outlet of the compressor unit 7 is connected to the refrigerant inlet of the first heat exchanger 4 and the second heat exchanger 6; in the heating mode, the first heat exchanger 4 and the second heat exchanger 6 cool the refrigerant, and the refrigerant outlets of the first heat exchanger 4 and the second heat exchanger 6 are connected to the inlet of the throttling element 9. The refrigerant passes through the outlet of the throttling element 9 and then passes through the air cooler 8. In the heating mode, the air cooler 8 heats the refrigerant. After passing through the air cooler 8, the refrigerant flows back to the low-pressure inlet of the compressor unit 7 and forms a complete circuit: A→J→I→G→H→F→E (D)→B (C)→A.

[0034] The flow control module is used to control the flow distribution of the refrigerant in the first heat exchanger 4 and the second heat exchanger 6, complete the switching of the cooling mode and the heating mode at any time under the operation of the working fluid circulation module, and reasonably distribute the flow, so as to realize the rapid liquefaction process and vaporization process of the phase change working fluid in the near-space environment.

[0035] In a feasible embodiment of the present invention, a control module is further included to control the working medium circulation module and the flow control module, so that the working medium circulation module can switch between the cooling mode and the heating mode at any time when working.

[0036] In a feasible embodiment of the present invention, the flow control module includes a first electromagnetic valve 10, which is the key to realizing the rapid liquefaction of the phase change working fluid in the near-space environment. The connection mode is as follows: the first end of the first electromagnetic valve 10 is connected to the throttling element 9, the second end of the first electromagnetic valve 10 is connected to the first heat exchanger 4, and the third end of the first electromagnetic valve 10 is connected to the second heat exchanger 6.

[0037] The working process of rapid liquefaction is that the refrigerant flows through the outlet of the throttling element 9, through the pipeline A, into the first electromagnetic valve 10, and then is divided into two paths after passing through the first electromagnetic valve 10, flowing to the first heat exchanger 4 through the pipeline B, and flowing to the second heat exchanger 6 through the pipeline C. In the cooling mode, the first electromagnetic valve 10 can be used to control the flow distribution of the refrigerant in the first heat exchanger 4 and the second heat exchanger 6, so that the flow meter in the first heat exchanger 4 is larger, realizing rapid liquefaction, and the refrigerant flow in the second heat exchanger 6 is less, realizing the re-cooling function, and preventing the liquid phase change working medium from re-vaporizing.

[0038] In a feasible embodiment of the present invention, the flow control module also includes a second solenoid valve 11, which is the key to achieving rapid vaporization of phase change working fluid in a near-space environment. The connection method is that the first end of the second solenoid valve 11 is connected to the compressor unit 7, the second end of the second solenoid valve 11 is connected to the first heat exchanger 4, and the third end of the second solenoid valve 11 is connected to the second heat exchanger 6.

[0039] The working process of rapid vaporization is as follows: the refrigerant passes through the compressor unit 7 and then flows to the first heat exchanger 4 through the pipeline E, and then flows to the second heat exchanger 6 through the pipeline D. In the heating mode, the flow distribution of the refrigerant in the first heat exchanger 4 and the second heat exchanger 6 can be controlled by the second solenoid valve 11, so that the flow in the second heat exchanger 6 is larger to achieve rapid vaporization, and the refrigerant flow in the first heat exchanger 4 is smaller to achieve the overheating function and prevent the gaseous phase change working medium from reliquefying.

[0040] In a feasible embodiment of the present invention, the flow control module also includes a four-way solenoid valve 12, which is the key to realizing the liquefaction and vaporization transformation of the phase change working fluid. The first end of the four-way solenoid valve 12 is connected to the first end of the second solenoid valve 11, the second end of the four-way solenoid valve 12 is connected to the low-pressure inlet of the compressor unit 7, the third end of the four-way solenoid valve 12 is connected to the high-pressure outlet of the compressor unit 7, and the fourth end of the four-way solenoid valve 12 is connected to the air cooler 8.

[0041] In the cooling mode, after the refrigerant passes through the first heat exchanger 4, the second heat exchanger 6 and the second solenoid valve 11, it passes through the four-way solenoid valve 12 through the pipeline F, and then passes through the compressor unit 7 through the pipeline G. After passing through the compressor unit 7, the refrigerant flows into the four-way solenoid valve 12 through the pipeline H, and finally passes through the four-way solenoid valve 12, flows through the pipeline I and enters the air cooler 8.

[0042] In the heating mode, the refrigerant flows out of the air cooler 8, flows into the four-way solenoid valve 12 through the pipeline I, and then passes through the pipeline and the compressor unit 7 through the pipeline G. After passing through the compressor unit 7, the refrigerant flows into the four-way solenoid valve 12 through the pipeline H, and finally flows into the first heat exchanger 4 and the second heat exchanger 6 after flowing through the second solenoid valve 11 through the pipeline F.

[0043] In a feasible embodiment of the present invention, the phase change heat transfer module further includes a liquid level meter 13 , which is in communication with the liquid collecting chamber 5 , and is used to measure the liquefaction rate of the liquid collecting chamber 5 in real time.

[0044] In a feasible embodiment of the present invention, since the near-space environment is a low-temperature and low-pressure condition, a low-temperature refrigerant is required to achieve rapid liquefaction and vaporization of the phase-change working fluid. The low-temperature refrigerant can be selected from one of ethane and ethylene.

[0045] In a feasible embodiment of the present invention, the first heat exchanger 4 and the second heat exchanger 6 include one of a shell-and-tube heat exchanger, a jacketed heat exchanger, a plate heat exchanger, a plate-fin heat exchanger, and a spiral plate heat exchanger.

[0046] In a feasible embodiment of the present invention, in order to prevent overpressure when filling refrigerant in the refrigeration system under normal pressure, the working fluid circulation module also includes an air storage tank 14, which is arranged upstream of the inlet of the compressor unit 7 to store the refrigerant and prevent system overpressure.

[0047] Therefore, the circulation system for near-space environment provided by the present invention can realize rapid switching between wet cooling mode and heating mode through the working fluid circulation module, thereby realizing the process of rapid liquefaction and vaporization of phase change working fluid, and finally regulating buoyancy and altitude through large volume changes of phase change working fluid, so as to realize long-term stable flight of stratospheric airship. The circulation system can realize rapid liquefaction and vaporization of phase change working fluid in near-space environment through flow distribution, and has compact structure, small mass, simple process, high efficiency and energy saving.

[0048] The aerostat provided by the present invention is described below. The aerostat described below and the circulation system for near-space environment described above can be referred to each other.

[0049] A second aspect of the present invention provides an aerostat, comprising a circulation system for a near-space environment as described in any one of the above items.

[0050] The aerostat provided in the second aspect of the present invention includes a circulation system for realizing rapid liquefaction and vaporization in a near-space environment as described above, and can control buoyancy and altitude through large volume changes of phase-change working fluids, thereby realizing long-term stable flight of the stratospheric aerostat.

[0051] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. 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 replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circulation system for near-space environments, It is characterized in that include: An air intake circulation module, the air intake circulation module comprising a phase change airbag (1) and a circulation fan (2), the phase change airbag (1) being used to provide a phase change working medium, and an air inlet of the circulation fan (2) being in communication with the phase change airbag (1); A phase change heat transfer module, the phase change heat transfer module comprising a liquefaction chamber (3), a first heat exchanger (4), a liquid collecting chamber (5) and a second heat exchanger (6), the air outlet of the circulation fan (2) and the second heat exchanger (6) being both in communication with the phase change airbag (1); the first heat exchanger (4) being arranged in the liquefaction chamber (3), the second heat exchanger (6) being arranged in the liquid collecting chamber (5), the liquefaction chamber (3) and the liquid collecting chamber (5) being in communication, and the first heat exchanger (4) and the second heat exchanger (6) being connected in parallel; A working medium circulation module, the working medium circulation module comprising a compressor unit (7), an air cooler (8) and a throttling element (9); in a cooling mode, a high-pressure outlet of the compressor unit (7) is connected to a high-pressure inlet of the air cooler (8); a high-pressure outlet of the first heat exchanger (4) is connected to a high-pressure inlet of the air cooler (8); a high-pressure outlet of the air cooler (8) is connected to a high-pressure inlet of the throttling element (9), and a low-pressure outlet of the throttling element (9) is connected to inlets of the first heat exchanger (4) and the second heat exchanger (6); in a heating mode, a high-pressure outlet of the compressor unit (7) is connected to inlets of the first heat exchanger (4) and the second heat exchanger (6); refrigerant outlets of the first heat exchanger (4) and the second heat exchanger (6) are connected to an inlet of the throttling element (9), and an outlet of the throttling element (9) flows back to the compressor unit (7) through the air cooler (8); A flow control module is used to control the flow distribution of the refrigerant in the first heat exchanger (4) and the second heat exchanger (6).

2. The circulation system for near-space environment according to claim 1, It is characterized in that It also includes a control module for controlling the working medium circulation module and the flow control module, so that the working medium circulation module can switch between the cooling mode and the heating mode at any time when working.

3. The circulation system for near-space environment according to claim 2, It is characterized in that The flow control module comprises a first electromagnetic valve (10), a first end of the first electromagnetic valve (10) being connected to the throttling element (9), a second end of the first electromagnetic valve (10) being connected to the first heat exchanger (4), and a third end of the first electromagnetic valve (10) being connected to the second heat exchanger (6).

4. The circulation system for near-space environment according to claim 2, It is characterized in that The flow control module further comprises a second electromagnetic valve (11), a first end of the second electromagnetic valve (11) being connected to the compressor unit (7), a second end of the second electromagnetic valve (11) being connected to the first heat exchanger (4), and a third end of the second electromagnetic valve (11) being connected to the second heat exchanger (6).

5. The circulation system for near-space environment according to claim 4, It is characterized in that The flow control module further comprises a four-way electromagnetic valve (12), a first end of the four-way electromagnetic valve (12) being connected to a first end of the second electromagnetic valve (11), a second end of the four-way electromagnetic valve (12) being connected to a low-pressure inlet of the compressor unit (7), a third end of the four-way electromagnetic valve (12) being connected to a high-pressure outlet of the compressor unit (7), and a fourth end of the four-way electromagnetic valve (12) being connected to the air cooler (8).

6. The circulation system for near-space environment according to claim 1, It is characterized in that The phase change heat transfer module further comprises a liquid level meter (13), wherein the liquid level meter (13) is in communication with the liquid collecting chamber (5).

7. The circulation system for near-space environment according to claim 1, It is characterized in that The working medium circulation module further comprises an air storage tank (14), wherein the air storage tank (14) is arranged upstream of the inlet of the compressor unit (7).

8. The circulation system for near-space environment according to claim 1, It is characterized in that The first heat exchanger (4) and the second heat exchanger (6) include one of a shell-and-tube heat exchanger, a jacketed heat exchanger, a plate heat exchanger, a plate-fin heat exchanger, and a spiral plate heat exchanger.

9. The circulation system for near-space environment according to claim 1, It is characterized in that The refrigerant includes one of ethane and ethylene.

10. An aerostat, It is characterized in that Comprising a circulation system for a near-space environment as described in any one of claims 1 to 9.

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