A storage device and method for backup compressed air

Abstract

This application relates to a storage device and method for standby compressed air, belonging to the technical field of gas storage. The storage device for standby compressed air includes a liquefaction mechanism, a liquid storage tank, and a vaporizer. The output end of the liquefaction mechanism is communicated with the input end of the liquid storage tank, and the output end of the liquid storage tank is communicated with the input end of the vaporizer. This application has the effects of reducing the floor area and ensuring that the installation period is not too long.

Description

Technical Field

[0001] The present application relates to the technical field of gas storage, and particularly relates to a storage device and method for standby compressed air. Background Art

[0002] In the production process of semiconductors and liquid crystal displays, a large amount of compressed air is usually required. As a key production gas, once there is a pressure fluctuation or gas cut-off in the compressed air, it will directly affect the operation of the entire factory. Therefore, it is very important for the factory to store compressed air for standby in case of emergency.

[0003] Currently, there are mainly two ways to store compressed air. One is to use a high-pressure storage tank as a standby. Due to transportation problems, the maximum volume of the high-pressure storage tank can only be 200 m 3 in volume. This method usually requires a large number of compressed air storage tanks, occupying a large area. The other is to use a site-built high-pressure spherical tank as a standby, but this method has high requirements for the ground foundation, a long on-site manufacturing cycle, and occupies a large area. Summary of the Invention

[0004] To help reduce the floor area and at the same time ensure that the installation period is not too long, the present application provides a storage device and method for standby compressed air.

[0005] In a first aspect, a storage device for standby compressed air provided by the present application adopts the following technical solution:

[0006] A storage device for standby compressed air includes a liquefaction mechanism, a liquid storage tank, and a vaporizer. The output end of the liquefaction mechanism is communicated with the input end of the liquid storage tank, and the output end of the liquid storage tank is communicated with the input end of the vaporizer.

[0007] Preferably, the liquid storage tank includes an outer tank body and an inner tank body located inside the outer tank body. A vacuum cavity is formed between the outer tank body and the inner tank body. Support and fixing members for supporting and fixing the inner tank body are arranged in the outer tank body. Both the liquefaction mechanism and the vaporizer are communicated with the inner tank body.

[0008] Preferably, the support and fixing members include first floating magnets arranged on the inner wall of the outer tank body and second floating magnets arranged on the outer wall of the inner tank body. The first floating magnets and the second floating magnets correspond to each other, and the corresponding first floating magnets and second floating magnets repel each other.

[0009] Preferably, the storage device further includes a PLC controller. A pressure sensor is arranged in the inner tank body. The pressure sensor is wirelessly connected to the PLC controller. A pressure stabilizing member for balancing the internal pressure is arranged on the inner tank body. The pressure stabilizing member is electrically connected to the PLC controller.

[0010] Preferably, the stability-maintaining component includes a pressure relief valve installed on the inner tank, the pressure relief valve extends out of the outer tank, and the pressure relief valve is electrically connected to the PLC controller.

[0011] Preferably, a connecting pipe is connected between the output end of the liquefying mechanism and the input end of the inner tank, and between the output end of the inner tank and the input end of the vaporizer. A pump body is installed on each connecting pipe, the pump body is electrically connected to the PLC controller, and a heat insulation component for blocking heat transfer between the connecting pipe and the outer tank is arranged on one side of the connecting pipe close to the outer tank.

[0012] Preferably, the heat insulation component includes a heat insulation ring sleeved on the connecting pipe and a heat insulation layer covering the connecting pipe. The heat insulation ring is located between the connecting pipe and the outer tank, the heat insulation layer is located on the side of the heat insulation ring away from the inner tank, one end of the heat insulation layer is connected to the heat insulation ring, and the other end extends in the direction away from the outer tank.

[0013] Preferably, the heat insulation layer includes a first flexible heat insulation layer covering the connecting pipe and a second flexible heat insulation layer located outside the first flexible heat insulation layer. A first magnetic strip is arranged on the side of the first flexible heat insulation layer away from the connecting pipe. One end of the second flexible heat insulation layer is connected to the heat insulation ring, and the other end is connected to the first flexible heat insulation layer. A second magnetic strip is arranged on the side of the second flexible heat insulation layer close to the connecting pipe. The first magnetic strip and the second magnetic strip are in one-to-one correspondence and are repulsively matched.

[0014] Preferably, an adiabatic sleeve is sleeved on the second flexible heat insulation layer. One end of the adiabatic sleeve is connected to the heat insulation ring, and the other end is connected to the second flexible heat insulation layer. A third magnetic strip is arranged in the adiabatic sleeve. The third magnetic strip and the second magnetic strip are in one-to-one correspondence and are attractively matched. A contact sensor is arranged on the side of the third magnetic strip close to the second magnetic strip. The contact sensor is wirelessly connected to the PLC controller. When the second flexible heat insulation layer is tensioned, the second magnetic strip and the third magnetic strip are in a separated state.

[0015] In a second aspect, a method for storing standby compressed air provided by the present application adopts the following technical solution:

[0016] A method for storing standby compressed air uses the storage device for standby compressed air as described above, and further includes the following steps:

[0017] Compressed air is converted into liquid air by a liquefying mechanism;

[0018] The liquid air produced by the liquefying mechanism is input into a liquid storage tank for storage;

[0019] When using compressed air, the liquid air in the liquid storage tank is converted into gaseous gas by a vaporizer.

[0020] In summary, the present application includes the following beneficial technical effects:

[0021] The liquefaction mechanism converts compressed air into liquid air, and the liquid air enters the liquid storage tank for storage. Since the volume of compressed air is greatly reduced after being converted into liquid air, a liquid storage tank with a volume of 150 m 3 is usually configured on-site to meet the standby requirements, eliminating the need for multiple liquid storage tanks and helping to reduce the floor area. When compressed air is needed, the liquid air in the liquid storage tank is pumped to the vaporizer and converted into gaseous gas through the vaporizer for subsequent use. Only one set of liquefaction mechanism, liquid storage tank and vaporizer needs to be installed on-site, with low cost and ensuring that the installation period is not too long to a certain extent. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.

[0023] Figure 2 is a cross-sectional view of the overall structure of the liquid storage tank in an embodiment of the present application.

[0024] Figure 3 is Figure 2 an enlarged view of part A in

[0025] Description of the reference numerals: 1. Liquefaction mechanism; 2. Liquid storage tank; 21. Outer tank body; 22. Inner tank body; 3. Vaporizer; 4. Vacuum chamber; 5. Support and fixing member; 51. First suspended magnet; 52. Second suspended magnet; 6. Pressure sensor; 7. Pressure relief valve; 8. Connecting pipe; 9. Pump body; 10. Heat insulation member; 101. Heat insulation ring; 102. Heat insulation layer; 1021. First flexible heat insulation layer; 1022. Second flexible heat insulation layer; 11. First magnetic strip; 12. Second magnetic strip; 13. Heat insulation sleeve; 14. Third magnetic strip; 15. Contact sensor. Detailed Description of the Embodiment

[0026] The following further describes the present application in detail Figures 1-3 with reference to the attached drawings.

[0027] An embodiment of the present application discloses a storage device for standby compressed air. Refer to Figure 1, the storage device for standby compressed air includes a liquefaction mechanism 1, a liquid storage tank 2, and a vaporizer 3. Among them, the liquefaction mechanism 1 is an existing cryogenic liquefaction device, and its specific structure belongs to the prior art and will not be elaborated here; the liquid storage tank 2 adopts a double-layer vacuum cryogenic liquid storage tank, and the liquefaction mechanism 1, the liquid storage tank 2, and the vaporizer 3 are all installed at the required site. Specifically, connecting pipes 8 are connected between the output end of the liquefaction mechanism 1 and the input end of the liquid storage tank 2, and between the output end of the liquid storage tank 2 and the input end of the vaporizer 3, that is, the output end of the liquefaction mechanism 1 and the input end of the liquid storage tank 2 are connected through the connecting pipe 8; the output end of the liquid storage tank 2 and the input end of the vaporizer 3 are connected through the connecting pipe 8, and pump bodies 9 are installed on the connecting pipes 8.

[0028] During use, the liquefaction mechanism 1 converts compressed air into liquid air, and the liquid air is pumped into the liquid storage tank 2 through the pump body 9 for storage. Since the volume of compressed air is greatly reduced after being converted into liquid air, usually a 150m 3 liquid storage tank 2 on-site can meet the standby requirements, and there is no need for multiple liquid storage tanks 2, which helps to reduce the floor area; when compressed air is needed, the liquid air in the liquid storage tank 2 is pumped to the vaporizer 3 through the pump body 9 and converted into gaseous gas by the vaporizer 3 for subsequent use. Only one set of liquefaction mechanism 1, liquid storage tank 2, and vaporizer 3 needs to be installed on-site, with low cost and ensuring that the installation period is not too long to a certain extent; at the same time, the liquefaction mechanism 1 can also be used as a nitrogen liquefaction device to liquefy nitrogen for storing liquid nitrogen, achieving multiple functions with one machine and greatly reducing the manufacturer's investment cost.

[0029] To facilitate the use of compressed air, a gas flow meter and a gas station outlet filter can also be set on the vaporizer 3 as needed to ensure the gas quality.

[0030] Refer to Figure 1 and Figure 2 , the liquid storage tank 2 includes an outer tank body 21 and an inner tank body 22. The inner tank body 22 is located inside the outer tank body 21, and a vacuum chamber 4 is formed between the outer tank body 21 and the inner tank body 22 to improve the cryogenic insulation effect of the inner tank body 22; support and fixing members 5 for supporting and fixing the inner tank body 22 are arranged inside the outer tank body 21, and the connecting pipes 8 on the liquefaction mechanism 1 and the vaporizer 3 all pass through the outer tank body 21 and are connected to the inner tank body 22.

[0031] Refer to Figure 2, To facilitate the support and fixation of the inner tank body 22, the support and fixation member 5 includes a first suspension magnet 51 and a second suspension magnet 52. The first suspension magnet 51 is fixed on the inner wall of the outer tank body 21, and the second suspension magnet 52 is fixed on the outer wall of the inner tank body 22. A plurality of first suspension magnets 51 and second suspension magnets 52 are arranged along the circumferential direction of the vacuum chamber 4. The first suspension magnets 51 and the second suspension magnets 52 correspond to each other one by one, and the corresponding first suspension magnet 51 and second suspension magnet 52 repel each other. Through the repulsive force between the first suspension magnet 51 and the second suspension magnet 52, the inner tank body 22 can be suspended and fixed, reducing the direct contact and heat transfer between the outer tank body 21 and the inner tank body 22, effectively achieving the effect of heat insulation and reducing adiabatic loss, which helps to ensure the stability of the liquid air in the inner tank body 22.

[0032] In other embodiments, the first suspension magnet 51 and the second suspension magnet 52 can be replaced by a plurality of adiabatic support rods. One end of the adiabatic support rod is fixed on the inner wall of the outer tank body 21, and the other end is fixed on the outer wall of the inner tank body 22. The inner tank body 22 can also be supported and fixed by the plurality of adiabatic support rods.

[0033] Refer to Figure 1 and Figure 2 , The storage device further includes a PLC controller (not shown in the figure). The liquefaction mechanism 1, the vaporizer 3, and the pump body 9 are all electrically connected to the PLC controller; a pressure sensor 6 is installed on the inner tank body 22, and the pressure sensor 6 is wirelessly connected to the PLC controller. A pressure stabilizing member for balancing the internal pressure is provided on the inner tank body 22, and the pressure stabilizing member is electrically connected to the PLC controller. To facilitate balancing and stabilizing the pressure inside the inner tank body 22, the pressure stabilizing member includes a pressure relief valve 7 installed on the inner tank body 22. The pressure relief valve 7 passes through the outer tank body 21, and the pressure relief valve 7 is electrically connected to the PLC controller.

[0034] Since the main components of liquid air are liquid oxygen, liquid nitrogen, and liquid argon, its physical properties are mainly affected by the above three components; when supercooled high-pressure liquid air is filled into the low-temperature inner tank body 22, it automatically balances to a low-pressure saturated liquid. Due to the influence of adiabatic loss, the liquid temperature will rise, and the liquid will vaporize. During the vaporization process, the nitrogen component in the liquid phase will decrease, the oxygen component will concentrate, the nitrogen component in the gas phase will increase, and the oxygen component will decrease, resulting in an increase in volume. The pressure sensor 6 detects the pressure inside the inner tank body 22 and sends it to the PLC controller. When the internal pressure value of the inner tank body 22 received by the PLC controller exceeds the preset range, the pressure relief valve 7 is started to relieve pressure, which helps to achieve automatic pressure relief until the internal pressure of the inner tank body 22 returns to the preset range, and then the pressure relief valve 7 is closed, which helps to store liquid air for a long time.

[0035] In other embodiments, the pressure sensor 6 can be replaced with a pressure gauge, a pressure sensor, etc., and the pressure relief valve 7 can be replaced with an air condenser. The air condenser is connected to the inner tank 22. Through the air condenser, using external liquid nitrogen as a cold source, the liquid air vapor in the inner tank 22 can be cooled and liquefied. After sufficient cooling, the pressure inside the inner tank 22 can be restored to the initial state, which can also ensure the long-term storage of liquid air without component changes.

[0036] Referring to Figure 2 and Figure 3 , on one side of the connecting pipe 8 close to the outer tank 21, there is a heat insulation member 10 for blocking heat transfer between the connecting pipe 8 and the outer tank 21. To facilitate heat insulation between the connecting pipe 8 and the outer tank 21, the heat insulation member 10 includes a heat insulation ring 101 and a heat insulation layer 102. The heat insulation ring 101 is fixedly sleeved on the connecting pipe 8, and the heat insulation ring 101 is located between the connecting pipe 8 and the outer tank 21. Specifically, the inner wall of the heat insulation ring 101 is fixed to the connecting pipe 8, the outer wall of the heat insulation ring 101 is fixed to the outer tank 21, and the surface of the heat insulation ring 101 close to the inner tank 22 is flush with the inner wall of the corresponding side of the outer tank 21. The heat insulation ring 101 can be one of an aerogel ring and a nano heat insulation ring 101, and there is no limitation here.

[0037] Referring to Figure 2 and Figure 3 , the heat insulation layer 102 is covered on the connecting pipe 8, and the heat insulation layer 102 is located on the side of the heat insulation ring 101 away from the inner tank 22. One end of the heat insulation layer 102 close to the inner tank 22 is connected to the heat insulation ring 101, and the other end extends in the direction away from the outer tank 21. Specifically, the heat insulation layer 102 includes a first flexible heat insulation layer 1021 and a second flexible heat insulation layer 1022. The first flexible heat insulation layer 1021 is fixedly covered on the outer wall of the connecting pipe 8 along the circumferential direction of the connecting pipe 8. The first flexible heat insulation layer 1021 is located on the side of the heat insulation ring 101 away from the inner tank 22 and is connected to the heat insulation ring 101. The first flexible heat insulation layer 1021 can be one of glass fiber and mineral wool, and there is no limitation here; a plurality of first magnetic strips 11 are fixed on the side of the first flexible heat insulation layer 1021 away from the connecting pipe 8. The first magnetic strips 11 are arranged along the circumferential direction of the connecting pipe 8, and the plurality of first magnetic strips 11 are arranged at intervals along the length direction of the connecting pipe 8.

[0038] Referring to Figure 2 and Figure 3, the second flexible heat insulation layer 1022 is located outside the first flexible heat insulation layer 1021. One end of the second flexible heat insulation layer 1022 is connected to the heat insulation ring 101, and the other end is connected to the side of the first flexible heat insulation layer 1021 away from the inner tank body 22. The second flexible heat insulation layer 1022 is one of glass fiber and mineral wool, and there is no limitation here; a plurality of second magnetic strips 12 are fixed on the side of the second flexible heat insulation layer 1022 close to the connecting pipe 8. The second magnetic strips 12 are arranged circumferentially around the connecting pipe 8. The first magnetic strip 11 corresponds to the second magnetic strip 12 one by one and is in a repulsive fit.

[0039] During use, the heat insulation ring 101 separates the outer tank body 21 from the connecting pipe 8, reducing the heat transfer between the two, which helps to block the heat bridge at the penetration of the connecting pipe 8 and ensures the stability of the liquid air in the inner tank body 22 to a certain extent; through the repulsive force between the first magnetic strip 11 and the second magnetic strip 12, a gap is formed between the first flexible heat insulation layer 1021 and the second flexible heat insulation layer 1022. At the same time, it can ensure that the first flexible heat insulation layer 1021 always fits against the outer wall of the connecting pipe 8 and is not easily detached or loosened due to the vibration of the connecting pipe 8, further insulating the connecting pipe 8 entering the outer tank body 21 and effectively reducing the heat transfer through the connecting pipe 8, providing convenience for maintaining the stability of the liquid air.

[0040] Refer to Figure 2 and Figure 3 , an adiabatic sleeve 13 is sleeved on the second flexible heat insulation layer 1022. One end of the adiabatic sleeve 13 is connected to the heat insulation ring 101, and the other end is connected to the side of the second flexible heat insulation layer 1022 away from the inner tank body 22. A third magnetic strip 14 is fixed inside the adiabatic sleeve 13. The third magnetic strip 14 corresponds to the second magnetic strip 12 one by one and is in an attractive fit. A contact sensor 15 is fixedly installed on the side of the third magnetic strip 14 close to the second magnetic strip 12. The contact sensor 15 is wirelessly connected to the PLC controller. When the second flexible heat insulation layer 1022 is tensioned, a gap is formed between the second flexible heat insulation layer 1022 and the adiabatic sleeve 13, and the second magnetic strip 12 and the third magnetic strip 14 are in a separated state.

[0041] The setting of the heat-insulating sleeve 13 helps to protect the first flexible heat-insulating layer 1021 and the second flexible heat-insulating layer 1022, making the first flexible heat-insulating layer 1021 and the second flexible heat-insulating layer 1022 not easily damaged mechanically. Through the adsorption force between the third magnetic strip 14 and the second magnetic strip 12, the vacuum gap between the first flexible heat-insulating layer 1021 and the second flexible heat-insulating layer 1022 is further ensured, ensuring the heat-insulating effect. At the same time, when the second flexible heat-insulating layer 1022 is damaged due to moisture, the second magnetic strip 12 will be in contact with the contact sensor 15 under the adsorption of the third magnetic strip 14. The contact sensor 15 sends the contact signal to the PLC controller. When the PLC controller receives the contact signal, it proves that the second flexible heat-insulating layer 1022 is damaged, prompting the operator to replace and repair it in time.

[0042] The implementation principle of the embodiment of the present application is as follows: When in use, the liquefaction mechanism 1 converts compressed air into liquid air, and the liquid air is pumped into the inner tank 22 of the liquid storage tank 2 through the pump body 9 for storage. The pressure sensor 6 detects the internal pressure of the inner tank 22 and sends it to the PLC controller. When the internal pressure value of the inner tank 22 received by the PLC controller exceeds the preset range, the pressure relief valve 7 is started for pressure relief until the internal pressure of the inner tank 22 returns to the preset range, and then the pressure relief valve 7 is closed, which helps to store liquid air for a long time. Since the volume of compressed air is greatly reduced after being converted into liquid air, usually one liquid storage tank 2 with a volume of 150m 3 can meet the standby requirements, and there is no need for multiple liquid storage tanks 2, which helps to reduce the floor area.

[0043] When compressed air is needed, the liquid air in the liquid storage tank 2 is pumped to the vaporizer 3 through the pump body 9 and converted into gaseous gas through the vaporizer 3 for subsequent use. Only one set of liquefaction mechanism 1, liquid storage tank 2 and vaporizer 3 needs to be installed on site for the storage device of the present application, which can ensure that the installation period is not too long to a certain extent and reduce costs; at the same time, the liquefaction mechanism 1 can also be used as a nitrogen liquefaction device to liquefy nitrogen for liquid nitrogen reserve, realizing multiple functions with one machine and greatly reducing the investment cost of the manufacturer.

[0044] The embodiment of the present application also discloses a method for storing standby compressed air. The method for storing standby compressed air uses the above-mentioned storage device for standby compressed air and further includes the following steps:

[0045] Step 1: The compressed air is converted into liquid air through the liquefaction mechanism 1;

[0046] Step 2: The liquid air produced by the liquefaction mechanism 1 is pumped into the inner tank 22 of the liquid storage tank 2 through the pump body 9 for storage. The internal pressure in the inner tank 22 is detected by the pressure sensor 6 and sent to the PLC controller. When the internal pressure value of the inner tank 22 received by the PLC controller is greater than the preset range, pressure relief is carried out through the pressure relief valve 7 until the internal pressure of the inner tank 22 returns to the preset range, and then the pressure relief valve 7 is closed;

[0047] Step 3: When using compressed air, the liquefied air in the inner tank 22 is transported to the vaporizer 3 through the pump body 9, and the liquid air is converted into gaseous air for use through the vaporizer 3.

[0048] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A storage device for spare compressed air, characterized in that: The invention comprises a liquefaction mechanism (1), a liquid storage tank (2) and a vaporizer (3), wherein the output end of the liquefaction mechanism (1) is connected to the input end of the liquid storage tank (2), the output end of the liquid storage tank (2) is connected to the input end of the vaporizer (3), a connecting pipe (8) is connected between the output end of the liquefaction mechanism (1) and the input end of the inner tank body (22), and between the output end of the inner tank body (22) and the input end of the vaporizer (3), the connecting pipe (8) is installed with a pump body (9), and a side of the connecting pipe (8) close to the outer tank body (21) is provided with a heat shield for blocking the heat between the connecting pipe (8) and the outer tank body (21). The heat insulating member (10) is provided with a heat insulating ring (101) sleeved on a connecting pipe (8) and a heat insulating layer (102) covering the connecting pipe (8); the heat insulating ring (101) is located between the connecting pipe (8) and an outer tank body (21); the heat insulating layer (102) is located on a side of the heat insulating ring (101) away from the inner tank body (22); one end of the heat insulating layer (102) is connected to the heat insulating ring (101) and the other end extends in a direction away from the outer tank body (21); the heat insulating layer (102) comprises a first flexible heat insulating layer (1021) covering the connecting pipe (8) and a heat insulating layer (1022) located on the connecting pipe (8); A second flexible thermal insulation layer (1022) is disposed outside the first flexible thermal insulation layer (1021); a first magnetic strip (11) is disposed on a side of the first flexible thermal insulation layer (1021) away from the connecting pipe (8); one end of the second flexible thermal insulation layer (1022) is connected to the thermal insulation ring (101), and the other end is connected to the first flexible thermal insulation layer (1021); a second magnetic strip (12) is disposed on a side of the second flexible thermal insulation layer (1022) close to the connecting pipe (8); the first magnetic strip (11) and the second magnetic strip (12) correspond to each other one by one and are mutually exclusive; and a thermal insulation sleeve is sleeved on the second flexible thermal insulation layer (1022). A tube (13), one end of the heat-insulating sleeve (13) is connected to the heat-insulating ring (101), and the other end is connected to the second flexible heat-insulating layer (1022); a third magnetic strip (14) is arranged in the heat-insulating sleeve (13); the third magnetic strip (14) corresponds to the second magnetic strip (12) one by one and is attracted to each other; a contact sensor (15) is arranged on the side of the third magnetic strip (14) close to the second magnetic strip (12); the contact sensor (15) is wirelessly connected to the PLC controller; when the second flexible heat-insulating layer (1022) is tensioned, the second magnetic strip (12) and the third magnetic strip (14) are in a disengaged state.

2. A storage device for spare compressed air according to claim 1, characterized in that: The liquid storage tank (2) comprises an outer tank body (21) and an inner tank body (22) located inside the outer tank body (21); a vacuum chamber (4) is formed between the outer tank body (21) and the inner tank body (22); a supporting fixture (5) for supporting and fixing the inner tank body (22) is provided inside the outer tank body (21); and the liquefaction mechanism (1) and the vaporizer (3) are both in communication with the inner tank body (22).

3. A storage device for spare compressed air according to claim 2, characterized in that: The supporting fixing member (5) comprises a first suspension magnetic block (51) arranged on the inner wall of the outer tank body (21) and a second suspension magnetic block (52) arranged on the outer wall of the inner tank body (22), the first suspension magnetic block (51) and the second suspension magnetic block (52) corresponding to each other, and the corresponding first suspension magnetic block (51) and the corresponding second suspension magnetic block (52) repel each other.

4. A storage device for spare compressed air according to claim 2, characterized in that: The storage device also includes a PLC controller, the inner tank body (22) is provided with a pressure sensor (6), the pressure sensor (6) is wirelessly connected to the PLC controller, the inner tank body (22) is provided with a stabilizing component for balancing the internal pressure, and the stabilizing component is electrically connected to the PLC controller.

5. A storage device for spare compressed air according to claim 4, characterized in that: The stabilizing component comprises a pressure relief valve (7) installed on the inner tank body (22), the pressure relief valve (7) protruding from the outer tank body (21), and the pressure relief valve (7) is electrically connected to the PLC controller.

6. A method for storing spare compressed air, using the spare compressed air storage device according to any one of claims 1 to 5, characterized in that: The following steps are also included: The compressed air is converted into liquid air through a liquefaction mechanism (1); The liquid air produced by the liquefaction mechanism (1) is input into the liquid storage tank (2) for storage; When compressed air is used, the liquid air in the liquid storage tank (2) is converted into gaseous gas through the vaporizer (3).

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