Pneumatic cold candle based on liquid oxygen release and use method thereof

Abstract

The invention discloses a pneumatic cold candle based on liquid oxygen release and a use method of the pneumatic cold candle. After high-pressure liquid oxygen of a liquid oxygen release module is gasified, an ejector ejects air to generate airflow which flows into a phase change cold storage module, and the cold supply temperature and the air volume are adjusted by adjusting the valve opening degree of the ejector of the liquid oxygen release module; a filter screen is arranged at the air inlet to protect the ejector; the cold storage cavity is filled with a phase change cold storage material, and cold bridges are arranged in the cold storage cavity and the air duct; cold air in the tuyere dehumidification module is supplied directionally after being dehumidified, and the humidity of supplied air is reduced by utilizing a dehumidification box; after the aerodynamic force cold candle completely releases cold energy, the liquid oxygen release module needs to replenish liquid oxygen, the phase change cold storage module replenishes cold storage capacity through an external cold source, and the tuyere dehumidification module needs to heat and regenerate a dehumidizer. The device is used for emergency cold supply and oxygen supply integrated guarantee of people in the high-temperature closed environment, people are prevented from being hurt by heat, oxygen for survival is provided at the same time, and the safety of people is guaranteed more stably in the high-temperature environment for a long time.

Description

Technical Field

[0001] The invention belongs to the technical fields of phase change cold storage and cold release and internal environment guarantee of armor, and particularly relates to an integrated device based on oxygen supply flow driving phase change cold release. Background Art

[0002] When submarines, amphibious armors, tanks, etc. operate in tropical coastal areas, all intake and exhaust channels need to be closed to protect the safety of internal crew members, forming a sealed space. In the sealed space, the air circulation is limited, and there is almost no material exchange between the inside and the outside environment, resulting in a series of problems in personnel safety guarantee. First, it is difficult to supplement the oxygen consumed by personnel in the sealed space. The equipped oxygen generation equipment consumes vehicle-mounted energy, and the vehicle-mounted voltage fluctuation causes the equipment to be prone to failure, with high maintenance costs. Second, the heat transfer between the sealed space and the external environment depends on the form of heat conduction and heat convection of internal environment air → wall → external environment air, with low heat dissipation efficiency. Moreover, the heat loads of personnel and equipment are large, and the external solar radiation intensity is high, resulting in the temperature in the sealed space being as high as over 50 °C, posing a great threat to the life safety of personnel. Finally, the air humidity in coastal areas is high. The evaporation of the sweat of the crew members in the sealed space causes the humidity inside the sealed space to approach saturation, which not only easily causes corrosion of the vehicle-mounted oxygen generation equipment, but also makes it difficult for the sweat of the crew members to evaporate, causing the core temperature of the human body to rise rapidly above the threshold and generating heat damage. Equipping additional cooling, dehumidifying, and oxygen generation equipment can reduce the temperature and humidity of the sealed space and increase the oxygen content. However, the existing refrigeration, dehumidifying, and oxygen generation equipment all consume a large amount of electric energy, and it is difficult for submarines, amphibious armors, tanks, etc. whose primary mission is combat to provide sufficient power for the operation of the refrigeration, dehumidifying, and oxygen generation equipment. Therefore, how to simultaneously achieve cooling, dehumidifying, and oxygen supply in a sealed space without a power source is crucial for ensuring the safety of crew members.

[0003] Phase change cold storage for cooling is a new type of cooling method and a commonly used short-term cooling guarantee method. By storing cold energy in phase change materials in advance, when in use, the phase change materials change from solid state to liquid state (such as ice, paraffin, etc.), or from liquid state to gaseous state (such as liquid oxygen, liquid nitrogen, etc.), or from solid state to gaseous state (such as dry ice), while absorbing a large amount of heat energy. Compared with sensible heat cold storage methods, this way of using latent heat cold storage by phase change materials has the advantages of high cold storage density and stable temperature, and has been widely used in industry. In terms of personnel cooling guarantee, phase change cold storage clothing and ice-cold fans are two common application methods of phase change cold storage. The phase change cold storage clothing embeds phase change cold storage materials inside the clothing. Personnel need to work while wearing the phase change cold storage clothing. The mass of the phase change materials carried by personnel is limited, otherwise it will affect the work efficiency of personnel. Therefore, the endurance time of the phase change cooling clothing is short. The ice-cold fan combines ice cubes and a fan. The air entering the fan exchanges heat with the ice cubes and then blows out. Due to the small heat exchange area between the ice cubes and the air, low heat exchange efficiency, and high relative humidity, its cooling effect is poor, and there is a large cold energy loss. In addition, the fan needs to be powered by electricity, resulting in low environmental adaptability and low cold storage density.

[0004] Liquid oxygen is a commonly used material in aerospace, medical, and industrial production, with the characteristics of high storage pressure and large gasification latent heat. The storage pressure of liquid oxygen under normal pressure is greater than 5.04 MPa and needs to be stored in high-pressure gas cylinders. High-pressure liquid oxygen can be ejected through an ejector, converting the pressure energy into velocity energy, reducing the pressure in the suction area to generate a vacuum, thereby ejecting the surrounding air to form a high-speed air flow. The gasification latent heat of liquid oxygen is about 213.1 J / g. Liquid oxygen absorbs a large amount of heat energy from the surrounding environment when gasifying, thus reducing the temperature of the environment, and is commonly used in the fields of aquatic product preservation and quick freezing. The controllable liquid oxygen gasification process has the characteristics of expansion ejection and heat absorption and cooling. In a high-temperature closed environment, the air flow released by liquid oxygen entrains high-temperature gas, and then exchanges heat with the phase change materials efficiently, and circulates the air supply to achieve the effects of reducing the air temperature in the closed space and increasing the oxygen concentration. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems proposed in the background technology. In order to simultaneously achieve cooling, dehumidification, and oxygen supply in a high-temperature and high-humidity closed space without a power source, a pneumatic cold candle based on liquid oxygen release and its usage method are provided. The oxygen supply and cold release are designed in an integrated manner, which can continuously provide cold air with a high oxygen content in a hot and closed environment, and has the advantages of high cold storage density, high cooling efficiency, and low cold energy loss, continuously guaranteeing the safety of personnel.

[0006] To achieve the object of the present invention, the present invention discloses a pneumatic cold candle based on liquid oxygen release, which includes a liquid oxygen release module, a phase change cold storage module, and an air outlet dehumidification module; the liquid oxygen release module is located at the bottom, the phase change cold storage module is located in the middle, and the air outlet dehumidification module is located at the upper part; the three modules are connected by buckles, magnetic attraction or threads, and washers are used for sealing to prevent air leakage at the connection.

[0007] Further, the liquid oxygen release module includes a liquid oxygen storage tank, an air inlet, an air filter, and an ejector; high-pressure liquid oxygen is stored in the liquid oxygen storage tank, an ejector is installed on the top of the liquid oxygen storage tank, the outer shell of the liquid oxygen release module is outside the tank, holes are opened on the outer shell around the ejector as the air inlet, and an air filter is installed at the rear of the air inlet; when the cold candle works, the liquid oxygen gasifies in the liquid oxygen storage tank to form high-pressure and low-temperature oxygen, the oxygen is ejected from the ejector to form an oxygen gas flow, and at the same time the ejector uses the high pressure of the oxygen to entrain air, the air flows through the filter in turn from the air inlet and enters the cold candle through the injection flow channel, mixes with the oxygen gas flow to become a high-speed gas flow, and enters the phase change cold storage module along the direction of the ejector's ejection; by adjusting the sizes of the ejector nozzle and the air inlet, the flow rate and velocity of the high-speed gas flow can be controlled.

[0008] Further, the phase change cold storage module includes a heat insulation outer shell, a cold storage cavity, an air duct, and a cold bridge; the cold storage cavity is filled with phase change materials (such as ice, paraffin, etc.), and the phase change materials need to be precooled in advance; a heat insulation outer shell is arranged outside the cold storage cavity to prevent the phase change materials from exchanging heat with the surrounding high-temperature environment and improve the utilization efficiency of cold energy; the air duct is inside the cold storage cavity, and the high-speed gas flow flows along the air duct; a number of cold bridges made of high thermal conductivity materials are arranged in the cold storage cavity and the air duct to strengthen heat transfer, increasing the heat transfer area and heat exchange rate between the gas flow and the phase change materials; when the cold candle works, the high-speed gas flow from the liquid oxygen release module enters the air duct of the phase change cold storage module from bottom to top; during the process of flowing through the air duct, heat enters the phase change materials from the wall surface and the cold bridge where the gas flow passes, and the phase change materials slowly undergo phase change to provide a stable cold source, and finally the low-temperature high-speed gas flow flows from the top of the phase change cold storage module to the air outlet dehumidification module.

[0009] Further, the air outlet dehumidification module includes a dehumidification box and an air outlet; the dehumidification box is located in front of the air outlet, and solid hygroscopic materials (such as silica gel beads) are filled in the dehumidification box; when the cold candle works, the low-temperature high-speed gas flow from the phase change cold storage module first passes through the dehumidification box, the relative humidity of the gas flow decreases, and then it flows out of the cold candle through the air outlet, and the wind direction of the air outlet is changed by manually adjusting the blades.

[0010] To achieve the object of the present invention, the present invention also discloses a method for using a pneumatic cold candle based on liquid oxygen release. When cooling, the air temperature is reduced in three steps:

[0011] Step 1: High-pressure oxygen is injected into the air duct through an ejector, while entraining air to form a mixed air flow. During the expansion and injection process of liquid oxygen, it absorbs heat and preliminarily cools the relatively hot air.

[0012] Step 2: When the air flow passes through the phase change cold storage module, it exchanges heat with the cold bridge and the inner wall surface of the cold storage cavity, and the temperature decreases.

[0013] Step 3: The relative humidity of the air flow is reduced through the moisture absorption of the dehumidification box, and the air is directionally supplied through the air outlet. At this time, the air flow is high-oxygen, low-temperature, and low-humidity air.

[0014] Furthermore, before single cooling, the charging of the phase change cold storage module must be completed in advance. During charging, liquid oxygen is filled into the liquid oxygen storage tank through a liquid oxygen machine or a large liquid oxygen storage tank, and the cold storage cavity is placed in a freezer until the phase change material is completely solidified. During this period, a fan blows air into the air duct to accelerate the phase change process.

[0015] Furthermore, the dehumidification box is placed in a drying oven until the desiccant is completely dry to achieve reuse.

[0016] Compared with the prior art, the significant progress of the present invention lies in that during cooling, the present invention undergoes a triple cooling process: First, high-pressure liquid oxygen absorbs heat during gasification and expansion, reducing the air flow temperature; Second, the phase change cold storage material exchanges heat with the air flow, absorbing heat to reduce the air flow temperature; Third, the dehumidification material reduces the relative humidity of the air flow, accelerating the evaporation of sweat on the surface of the human body during the heat exchange process between the air flow and the human body, achieving the third stage of cooling; The present invention is used for emergency cooling and oxygen supply integration protection of personnel in high-temperature and airtight environments, preventing personnel from being thermally injured while providing oxygen for survival, capable of improving the cold storage density, enhancing the cooling efficiency, reducing cold energy loss, and more effectively and stably ensuring the safety of personnel in high-temperature environments.

[0017] To more clearly illustrate the functional characteristics and structural parameters of the present invention, the following further explains in conjunction with the drawings and specific embodiments. Brief Description of the Drawings

[0018] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 is a pneumatic cold candle diagram based on liquid oxygen release;

[0020] The reference numerals in the drawings are: 1 - liquid oxygen storage tank, 2 - liquid oxygen, 3 - air inlet, 4 - air filter, 5 - ejector, 6 - injection flow channel, 7 - heat insulation shell, 8 - cold storage cavity, 9 - air duct, 10 - cold bridge, 11 - dehumidification box, 12 - air outlet. Detailed implementation manners

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] The present invention relates to a pneumatic cold candle based on liquid oxygen release and its usage method, which is divided into a liquid oxygen release module, a phase change cold storage module, and an air outlet dehumidification module, and is used for the integrated guarantee of emergency cooling and oxygen supply for personnel in a high-temperature and airtight environment, preventing personnel from suffering heat damage and providing oxygen for survival; without a power device, the high-pressure liquid oxygen in the liquid oxygen release module is vaporized and then the air is entrained by an ejector to generate an air flow that flows into the phase change cold storage module. The supply temperature and air volume are adjusted by adjusting the valve opening of the ejector in the liquid oxygen release module, and a filter screen is provided at the air inlet to protect the ejector; the phase change cold storage module is composed of an air duct, a cold storage cavity, and a heat insulation outer shell. The cold storage cavity is filled with a phase change cold storage material, and cold bridges are provided in both the cold storage cavity and the air duct; in the air outlet dehumidification module, the cold air is dehumidified and then sent in a directional manner, and a dehumidification box is used to reduce the humidity of the supply air. After the pneumatic cold candle completely releases the cold energy, the liquid oxygen release module needs to be replenished with liquid oxygen, the phase change cold storage module replenishes the cold storage capacity through an external cold source, and the air outlet dehumidification module needs to heat and regenerate the dehumidifying agent. The detailed implementation manners are as follows:

[0023] As Figure 1 shown, a pneumatic cold candle based on liquid oxygen release includes a liquid oxygen release module, a phase change cold storage module, and an air outlet dehumidification module; the liquid oxygen release module is located at the bottom, the phase change cold storage module is located in the middle, and the air outlet dehumidification module is located at the upper part; the three modules are connected by buckles, magnetic attraction or threads, and gaskets are used for sealing to prevent air leakage at the connection. The liquid oxygen release module uses the vaporization and injection of high-pressure liquid oxygen to provide power and reduce the temperature of the air, without an additional power source; in the phase change cold storage module, the phase change material absorbs the heat energy in the air through the cold bridge and the heat exchange wall surface, further reducing the supply air temperature; the air outlet dehumidification module reduces the relative humidity of the supply air and controls the supply air direction, promoting the evaporation of sweat of the personnel working at high temperatures.

[0024] Specifically, in one embodiment, the liquid oxygen release module includes a liquid oxygen storage tank 1, an air inlet 3, an air filter 4, and an ejector 5. High-pressure liquid oxygen 2 is stored in the liquid oxygen storage tank 1. The ejector 5 is installed at the top of the liquid oxygen storage tank 1. The outer shell of the liquid oxygen release module is outside the tank. The outer shell around the ejector 5 is perforated as the air inlet, and the air filter 4 is installed behind the air inlet. When the cold candle is working, the liquid oxygen 2 vaporizes in the liquid oxygen storage tank 1 to form high-pressure and low-temperature oxygen. The oxygen is ejected from the ejector 5 to form an oxygen gas flow. At the same time, the ejector 5 uses the high pressure of the oxygen to eject air. The air flows through the filter in sequence from the air inlet 3 and enters the cold candle through the injection flow channel 6, mixes with the oxygen gas flow to become a high-speed gas flow, and enters the phase change cold storage module along the direction of the ejector 5. By adjusting the sizes of the nozzle of the ejector 5 and the air inlet 3, the flow rate and velocity of the high-speed gas flow can be controlled.

[0025] Specifically, in one embodiment, the phase change cold storage module includes a heat insulation outer shell 7, a cold storage cavity 8, an air duct 9, and a cold bridge 10. The cold storage cavity 8 is filled with a phase change material, and the phase change material needs to be precooled in advance. The heat insulation outer shell 7 is arranged outside the cold storage cavity 8 to prevent the phase change material from exchanging heat with the surrounding high-temperature environment and improve the utilization efficiency of cold energy. The air duct 9 is inside the cold storage cavity 8, and the high-speed gas flow flows along the air duct 9. A number of cold bridges 10 made of high thermal conductivity materials are arranged in the cold storage cavity 8 and the air duct 9 to strengthen heat transfer and increase the heat transfer area and heat exchange rate between the gas flow and the phase change material. When the cold candle is working, the high-speed gas flow from the liquid oxygen release module enters the air duct 9 of the phase change cold storage module from bottom to top. During the process of flowing through the air duct 9, heat enters the phase change material from the gas flow through the wall surface and the cold bridge 10, and the phase change material slowly undergoes a phase change to provide a stable cold source. Finally, the low-temperature high-speed gas flow flows from the top of the phase change cold storage module to the air outlet dehumidification module.

[0026] Specifically, in one embodiment, the air outlet dehumidification module includes a dehumidification box 11 and an air outlet 12. The dehumidification box 11 is located in front of the air outlet 12, and solid hygroscopic materials are filled in the dehumidification box 11. When the cold candle is working, the low-temperature high-speed gas flow from the phase change cold storage module first passes through the dehumidification box 11, and the relative humidity of the gas flow decreases. Then it flows out of the cold candle through the air outlet 12, and the wind direction of the air outlet 12 is changed by manually adjusting the blades.

[0027] A method for using a pneumatic cold candle based on liquid oxygen release. When providing cooling, the air temperature is reduced in three steps. The specific steps are as follows:

[0028] Step 1: High-pressure oxygen is ejected into the air duct through the ejector, and at the same time, air is ejected to form a mixed gas flow. The liquid oxygen absorbs heat during the process of expansion and ejection, and initially cools the relatively hot air.

[0029] Step 2: When the gas flow passes through the phase change cold storage module, it exchanges heat with the cold bridge and the inner wall surface of the cold storage cavity, and the temperature decreases.

[0030] Step 3: Reduce the relative humidity of the air flow through the moisture absorption of the dehumidification box, and send the air flow in a directional manner through the air outlet. At this time, the air flow is air with high oxygen content, low temperature, and low humidity.

[0031] Specifically, in one embodiment, during cooling, first combine the liquid oxygen release module, the phase change cold storage module, and the air outlet dehumidification module together. Then manually turn on the switch of the ejector. The switch of the ejector is connected to the wall near the air inlet through a mechanical structure. Open the air outlet and adjust the air outlet direction, and adjust the opening degree of the ejector and the air outlet according to the actual thermal sensation of the human body. The air flows in from the air inlet into the air filter and enters the ejection flow channel under the action of air pressure; the liquid oxygen is ejected at high speed from the high-pressure liquid oxygen through the ejector, and at the same time entrains the air to form an air flow; the air flow enters the air duct of the phase change cold storage module, exchanges heat with the phase change cold storage material through the wall surface and the cold bridge to cool down, and then enters the air outlet dehumidification module; finally, the cold air flow flows out of the cold candle after dehumidification to achieve cooling. This method undergoes three cooling processes: First, the high-pressure liquid oxygen absorbs heat during the gasification and expansion processes, reducing the air flow temperature; Second, the phase change cold storage material exchanges heat with the air flow, absorbing heat to reduce the air flow temperature; Third, the dehumidification material reduces the relative humidity of the air flow, and during the heat exchange process between the air flow and the human body, it accelerates the evaporation of sweat on the human body surface to achieve the third cooling.

[0032] Specifically, in one embodiment, before single cooling, it is necessary to complete the precooling of the phase change cold storage module in advance; during precooling, fill the liquid oxygen storage tank with liquid oxygen through a liquid oxygen machine or a large liquid oxygen storage tank, place the cold storage cavity in a freezer until the phase change material is completely solidified, and during this period, blow air into the air duct through a fan to accelerate the phase change process.

[0033] Specifically, in one embodiment, place the dehumidification box in a drying oven until the desiccant is completely dry to achieve reuse.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic cold candle based on liquid oxygen release, characterized in that It includes a liquid oxygen release module, a phase change cold storage module, and an air outlet dehumidification module; the liquid oxygen release module is located at the bottom, the phase change cold storage module is located in the middle, and the air outlet dehumidification module is located at the upper part; the three modules are connected by buckles, magnetic attraction or threads, and washers are used for sealing to prevent air leakage at the connection.

2. The pneumatic cold candle based on liquid oxygen release according to claim 1 is characterized in that, The liquid oxygen release module includes a liquid oxygen storage tank (1), an air inlet (3), an air filter (4) and an ejector (5); high-pressure liquid oxygen (2) is stored in the liquid oxygen storage tank (1), the ejector (5) is installed on the top of the liquid oxygen storage tank (1), the outer shell of the liquid oxygen release module is outside the tank, holes are opened on the outer shell around the ejector (5) as the air inlet, and the air filter (4) is installed at the rear of the air inlet; when the cold candle works, the liquid oxygen (2) vaporizes in the liquid oxygen storage tank (1) to form high-pressure and low-temperature oxygen, the oxygen is ejected from the ejector (5) to form an oxygen gas flow, at the same time the ejector (5) uses the high pressure of the oxygen to entrain air, the air flows through the filter in turn from the air inlet (3) and enters the injection flow channel (6), enters the cold candle, mixes with the oxygen gas flow to become a high-speed gas flow, and enters the phase change cold storage module along the direction of the ejector (5) injection; by adjusting the sizes of the ejector (5) nozzle and the air inlet (3), the flow rate and velocity of the high-speed gas flow can be controlled.

3. A pneumatic cold candle based on liquid oxygen release according to claim 1, characterized in that The phase change cold storage module includes a heat insulation outer shell (7), a cold storage cavity (8), an air duct (9) and a cold bridge (10); the cold storage cavity (8) is filled with a phase change material, and the phase change material needs to be precooled in advance; the heat insulation outer shell (7) is arranged outside the cold storage cavity (8) to prevent the phase change material from exchanging heat with the surrounding high-temperature environment and improve the utilization efficiency of cold energy; the air duct (9) is inside the cold storage cavity (8), and the high-speed gas flow flows along the air duct (9); a number of cold bridges (10) made of high thermal conductivity materials are arranged in the cold storage cavity (8) and the air duct (9) to strengthen heat transfer and increase the heat transfer area and heat exchange rate between the gas flow and the phase change material; when the cold candle works, the high-speed gas flow from the liquid oxygen release module enters the air duct (9) of the phase change cold storage module from bottom to top; during the process of flowing through the air duct (9), heat enters the phase change material from the wall surface and the cold bridge (10) through which the gas flow passes, and the phase change material slowly undergoes a phase change to provide a stable cold source, and finally the low-temperature high-speed gas flow flows from the top of the phase change cold storage module to the air outlet dehumidification module.

4. A pneumatic cold candle based on liquid oxygen release according to claim 1, characterized in that, The air outlet dehumidification module includes a dehumidification box (11) and an air outlet (12); the dehumidification box (11) is located in front of the air outlet (12), and solid hygroscopic materials are filled in the dehumidification box (11); when the cold candle works, the low-temperature high-speed gas flow from the phase change cold storage module first passes through the dehumidification box (11), the relative humidity of the gas flow decreases, and then flows out of the cold candle through the air outlet (12), and the wind direction of the air outlet (12) is changed by manually adjusting the blades.

5. A method for using a pneumatic cold candle based on liquid oxygen release, the method being based on the pneumatic cold candle according to any one of claims 1-4, characterized in that, When cooling, the air temperature is reduced in three steps: Step 1, high-pressure oxygen is ejected into the air duct through the ejector, and at the same time air is entrained to form a mixed gas flow, and the liquid oxygen absorbs heat during the expansion and ejection process to initially cool the relatively hot air. Step 2, when the gas flow passes through the phase change cold storage module, it exchanges heat with the cold bridge and the inner wall surface of the cold storage cavity, and the temperature decreases. Step 3: Reduce the relative humidity of the air flow through the moisture absorption of the dehumidification box, and conduct directional air supply through the air outlet. At this time, the air flow is air with high oxygen content, low temperature, and low humidity.

6. A method for using a pneumatic cold candle based on liquid oxygen release according to claim 5, characterized in that, Before single cooling, the charging of the phase change cold storage module must be completed in advance; during charging, liquid oxygen is filled into the liquid oxygen storage tank through a liquid oxygen generator or a large liquid oxygen storage tank, and the cold storage cavity is placed in a freezer until the phase change material is completely solidified. During this period, a fan is used to blow air into the air duct to accelerate the phase change process.

7. A method for using a pneumatic cold candle based on liquid oxygen release according to claim 5, characterized in that, Place the dehumidification box in the drying oven until the desiccant is completely dry to achieve reuse.

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