An inert gas liquefaction device

Abstract

This invention provides an inert gas liquefaction device, comprising a purifier, a bag condenser, a refrigeration unit, and a gas cylinder. The purifier purifies the gaseous inert gas, and the purified inert gas is then fed into the liquefaction bag of the bag condenser. A refrigerant from the refrigeration unit circulates through the chilled water chamber of the bag condenser. The refrigerant in the chilled water chamber directly feeds back temperature and pressure to the liquefaction bag, applying pressure to cause the liquefaction bag to contract, transforming the inert gas from a gaseous state to a liquid state within the liquefaction bag. The liquid inert gas is then sent to a storage chamber for storage. This design utilizes the expandable and contractile properties of the liquefaction bag as a liquefaction container. The dual pressure generated by the inlet pressurization and the refrigerant pressurization effectively prevents the inert gas from being drawn away during the vacuuming process, reducing energy consumption.

Description

Technical Field

[0001] This invention belongs to the technical field of gas liquefaction devices, and specifically relates to an inert gas liquefaction device. Background Technology

[0002] In existing technologies, current gas-to-liquid devices, such as Figures 1-2 As shown, the inert gas is typically purified using a purifier 1' and then passed into a condenser 2' made of steel to collect it. An external chiller 3' then circulates coolant into the condenser 2' for cooling; however, the cooling effect is not significant. Furthermore, a vacuum pump 5' is needed to create negative pressure inside the condenser 2' to pressurize the liquefied gas. However, using the vacuum pump 5' to create a vacuum inside the steel container of the condenser 2' carries the risk of removing the inert gas, significantly increasing energy consumption.

[0003] Furthermore, current gas-to-liquid conversion devices employ complex processes, have low automation levels, and are cumbersome to operate. They also suffer from poor sealing, high power consumption, slow and unstable water heating, environmental unfriendliness, and difficult maintenance.

[0004] Therefore, how to avoid the removal of inert gas during the vacuuming process and reduce energy consumption is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an inert gas liquefaction device that can effectively avoid the phenomenon of inert gas being drawn away during the vacuuming process, thereby reducing energy consumption.

[0006] To solve the above-mentioned technical problems, the present invention provides an inert gas liquefaction device, comprising: a purifier, a bag condenser, a refrigeration unit, and a gas cylinder;

[0007] The purifier is used to purify gaseous inert gas, the bag condenser is used to condense inert gas, and the refrigerator is used to freeze the medium.

[0008] The purifier is provided with a first air inlet, an air outlet and a vacuum port. The bag condenser includes a chilled water tank, a stretchable liquefaction bag and a liquid storage tank. The chilled water tank is provided with a first liquid inlet and a first liquid outlet. The liquefaction bag is disposed in the chilled water tank. The liquefaction bag is provided with a second air inlet and a second liquid outlet. The liquid storage tank is provided with a second liquid inlet and a third liquid outlet.

[0009] The purifier has a first air inlet for introducing inert gas, a vacuum port for evacuating a vacuum, and a first air outlet connected to the second air inlet of the liquefied bag via a first pipe. A first control valve is connected in series on the first pipe. The second liquid outlet of the liquefied bag is connected to the second liquid inlet of the storage tank via a second pipe. A drain valve is connected in series on the second pipe. The third liquid outlet of the storage tank is used to discharge inert gas in liquid state. The first liquid inlet of the chilled water tank is connected to the medium outlet of the chiller, and the first liquid outlet is connected to the medium inlet of the chiller.

[0010] Optionally, the above-mentioned inert gas liquefaction device also includes a control system, wherein the liquefaction bag is equipped with a liquefaction bag pressure gauge for monitoring internal pressure, and the chilled water tank is equipped with a chilled medium instrument for monitoring internal pressure and temperature.

[0011] The control system is used to control the opening degree of the first control valve according to the pressure of the liquefied bag pressure gauge and / or the temperature and pressure of the refrigerant instrument.

[0012] Optionally, in the above-mentioned inert gas liquefaction device, there are multiple bag condensers, and multiple first control valves are connected by interlocking switches.

[0013] Optionally, in the above-mentioned inert gas liquefaction device, a booster pump is provided between the first liquid inlet of the chilled water tank and the medium outlet of the chiller. The control system is also used to control the opening degree of the booster pump according to the pressure of the liquefaction bag pressure gauge and / or the temperature and pressure of the chilled medium instrument.

[0014] Optionally, the above-mentioned inert gas liquefaction device also includes a gas cylinder, which is connected to the third outlet of the liquid storage tank.

[0015] Optionally, in the above-mentioned inert gas liquefaction device, the number of gas cylinders is multiple.

[0016] Optionally, in the above-mentioned inert gas liquefaction device, a second control valve is provided between the gas cylinder and the third outlet of the liquid storage tank, and a liquid storage tank level gauge for detecting the liquid level is provided in the liquid storage tank.

[0017] The control system is also used to control the second control valve to open when the liquid level gauge of the liquid storage tank detects that the liquid level in the liquid storage tank has reached a preset height.

[0018] Optionally, in the above-mentioned inert gas liquefaction device, the liquefaction bag is provided with a liquefaction bag safety valve, and the control system is further used to open the liquefaction bag safety valve when the internal pressure of the liquefaction bag is greater than a preset pressure value.

[0019] Optionally, in the above-mentioned inert gas liquefaction device, the chilled water tank and the liquid storage tank are integrally formed cavity structures, and the cavity structure is divided into the chilled water tank and the liquid storage tank by a separation plate.

[0020] Optionally, in the above-mentioned inert gas liquefaction device, a check valve is connected in series on the first pipeline.

[0021] This invention provides an inert gas liquefaction device, the advantages of which are:

[0022] A purifier is used to purify the gaseous inert gas. The purified inert gas is then fed into the liquefaction bag of a baghouse condenser. Refrigerant from the chiller is circulated through the chilled water chamber of the baghouse condenser. The refrigerant in the chilled water chamber directly feeds back temperature and pressure to the liquefaction bag, applying pressure to cause the bag to contract. The inert gas then transforms from a gaseous state to a liquid state within the liquefaction bag. The liquid inert gas is then sent to a storage tank for storage. This setup utilizes the expandable nature of the liquefaction bag as a liquefaction container. The dual pressure created by the inlet pressurization and the refrigerant pressurization effectively prevents the inert gas from being drawn away during the vacuuming process, reducing energy consumption. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A schematic diagram of an inert gas liquefaction device provided by the prior art;

[0025] Figure 2 A schematic diagram of the structure of a condenser provided in the prior art;

[0026] Figure 3 A schematic diagram of the structure of an inert gas liquefaction device (a bag condenser) provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of a condenser provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the structure of an inert gas liquefaction device (three gas cylinders) provided in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of an inert gas liquefaction device (three bag condensers and three gas cylinders) provided for an embodiment of the present invention.

[0030] exist Figures 1-2 middle:

[0031] 1'-Purifier; 2'-Condenser; 3'-Refrigerator; 4'-Gas cylinder; 5'-Vacuum pumping equipment;

[0032] exist Figures 3-6 middle:

[0033] 1-Purifier; 101-Pneumatic valve;

[0034] 2-Bag condenser; 201-Liquefied bag; 202-Chilled water tank; 203-Liquid storage tank; 204-Separation plate; 205-Hose; 206-Drain valve; 207-Liquefied bag pressure gauge; 208-Refrigeration medium instrument; 209-Liquefied bag safety valve; 210-Liquid storage tank level gauge; 211-Check valve;

[0035] 3-Refrigeration unit; 301-Booster pump;

[0036] 4-Gas cylinder;

[0037] a-Inert gas; b-Refrigeration medium; c-Vacuum. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] The core of this invention is to provide an inert gas liquefaction device that can effectively avoid the phenomenon of inert gas being drawn away during the vacuuming process, thereby reducing energy consumption.

[0040] To enable those skilled in the art to better understand the technical solutions provided by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] For details, please refer to Figures 3-6 The present invention provides an inert gas liquefaction device, comprising: a purifier 1, a bag condenser 2, a refrigeration unit 3, and a gas cylinder 4.

[0042] Among them, purifier 1 is used to purify gaseous inert gas a, bag condenser 2 is used to condense inert gas a, and refrigeration unit 3 is used to freeze medium b.

[0043] The purifier 1 has a first air inlet, an air outlet, and a vacuum port. The bag condenser 2 includes a chilled water tank 202, a retractable liquefaction bag 201, and a liquid storage tank 203. The chilled water tank 202 has a first liquid inlet and a first liquid outlet. The liquefaction bag 201 is disposed inside the chilled water tank 202. The liquefaction bag 201 has a second air inlet and a second liquid outlet. The liquid storage tank 203 has a second liquid inlet and a third liquid outlet.

[0044] The first air inlet of purifier 1 is used to introduce inert gas a, and the vacuum port of purifier 1 is used to evacuate the liquefaction bag 201 of purifier 1 and bag condenser 2. The first air outlet of purifier 1 and the second air inlet of liquefaction bag 201 are connected by a first pipe, and a first control valve is connected in series on the first pipe. The first pipe passes through the wall of chilled water tank 202 and connects to liquefaction bag 201. The first control valve can be a pneumatic valve 101.

[0045] The second outlet of the liquefied bag 201 is connected to the second inlet of the storage tank 203 via a second pipe, and a steam trap 206 is connected in series on the second pipe. The steam trap 206 serves to prevent vapor leakage and drain water in the second pipe. By selecting a suitable steam trap 206, the liquefied bag 201 can achieve the highest working efficiency in draining liquid. The third outlet of the storage tank 203 is used to discharge inert gas a in liquid state. The first inlet of the chilled water tank 202 is connected to the medium outlet of the chiller 3, and the first outlet is connected to the medium inlet of the chiller 3.

[0046] It should be noted that the liquefaction bag 201 is made of a stretchable material. Utilizing its inherent stretchability and thin-walled characteristics, the liquefaction bag 201 can contract when external pressure is applied, thus allowing for a more direct feedback of temperature and pressure to the liquefaction reaction, thereby accelerating the liquefaction process. This solves the energy loss problem in existing technologies where a vacuum pump is needed to create negative pressure in steel structures, resulting in gas extraction.

[0047] The inert gas liquefaction device provided by this invention uses a purifier 1 to purify gaseous inert gas. The purified inert gas is then fed into the liquefaction bag 201 of a bag condenser 2. A refrigerant medium b from a refrigeration unit 3 circulates through the chilled water tank 202 of the bag condenser 2. The refrigerant medium b in the chilled water tank 202 directly feeds back its temperature and pressure to the liquefaction bag 201. Applying pressure causes the liquefaction bag 201 to contract, causing the inert gas to change from a gaseous state to a liquid state within the liquefaction bag 201. The liquid inert gas is then sent to a storage tank 203 for storage. This setup utilizes the expandable and contractile properties of the liquefaction bag 201 as a liquefaction container. The dual pressure generated by the pressurization of the inlet gas and the pressurization of the refrigerant medium b effectively prevents the inert gas from being drawn away during the vacuuming process, reducing energy consumption.

[0048] Specifically, the inert gas source storage device is used to collect the inert gas that needs to be liquefied. The inert gas source storage device is connected to the first air inlet of the purifier 1, and the collected inert gas that needs to be liquefied is transported into the purifier 1 through the inert gas source storage device.

[0049] The liquefaction bag 201 can be made of PTFE and can be used as a collection container that is resistant to low temperatures, corrosion, and high pressure. The freezing medium b can be a liquid such as alcohol.

[0050] To achieve automated control, this solution also includes a control system. A liquefied bag pressure gauge 207 is installed on the liquefied bag 201 to monitor internal pressure, and a refrigerant medium instrument 208 is installed on the chilled water tank 202 to monitor internal pressure and temperature. The refrigerant medium instrument 208 can be a pressure gauge, or it can include both a pressure gauge and a thermometer connected in series.

[0051] The control system is used to control the opening degree of the first control valve based on the pressure of the liquefied bag pressure gauge 207 and / or the temperature and pressure of the refrigerant medium gauge 208.

[0052] In a further specific embodiment, there are multiple bag filter condensers 2, and multiple first control valves are connected by interlocking switches. The PLC control system opens the first control valve of the corresponding bag filter condenser 2 as needed.

[0053] To improve the flowability of the cooling medium, a booster pump 301 is installed between the first liquid inlet of the chilled water tank 202 and the medium outlet of the chiller 3. The control system is also used to control the opening degree of the booster pump 301 according to the pressure of the liquefied bag pressure gauge 207 and / or the temperature and pressure of the chilled medium instrument 208.

[0054] Specifically, booster pump 301 can be a booster pump 301 with frequency conversion.

[0055] In addition, a regulating valve is provided at the medium outlet of the refrigeration unit 3, and the control system is also used to control the opening degree of the regulating valve according to the pressure of the liquefied bag pressure gauge 207 and / or the temperature and pressure of the refrigeration medium gauge 208.

[0056] In a specific embodiment, this solution also includes a gas cylinder 4, which is connected to the third liquid outlet of the liquid storage tank 203 to collect the liquefied inert gas.

[0057] There are multiple gas cylinders 4, as detailed below. Figure 5 As shown, multiple gas cylinders 4 are connected to the third outlet of a liquid storage tank 203 via a main delivery pipe. Alternatively, as shown... Figure 6 As shown, multiple gas cylinders 4 are simultaneously connected to the third outlet of multiple liquid storage tanks 203 through a single delivery main pipe.

[0058] In a further specific embodiment, a second control valve is provided between the gas cylinder 4 and the third liquid outlet of the liquid storage tank 203, and a liquid storage tank level gauge 210 for detecting the liquid level is provided in the liquid storage tank 203.

[0059] The control system is also used to control the second control valve to open when the liquid level gauge 210 detects that the liquid level in the liquid storage tank 203 has reached a preset height.

[0060] To simplify the structure of the bag condenser 2, the chilled water tank 202 and the liquid storage tank 203 are integrally formed cavity structures. The cavity structure is divided into upper and lower regions by a separation plate 204, namely the chilled water tank 202 and the liquid storage tank 203.

[0061] The second conduit can be a flexible hose 205, which can be a telescopic or elastic structure, such as a corrugated pipe, to facilitate the contraction and expansion of the liquefaction bag 201. Specifically, the flexible hose 205 can be made of PTFE low-temperature resistant material.

[0062] In a specific embodiment, a liquefaction bag safety valve 209 is provided on the liquefaction bag 201. The control system is also used to open the liquefaction bag safety valve 209 when the internal pressure of the liquefaction bag 201 is greater than a preset pressure value. Specifically, the safety valve with the set pressure value is automatically opened, returning the inert gas to the front end of the purifier 1 to release pressure, which greatly increases the safety of the equipment.

[0063] In addition, a check valve 211 is connected in series on the first pipeline. The check valve 211 is installed to prevent gas from returning to the purifier 1 when the pressure in the liquefied bag 201 is too high.

[0064] The system principle of the inert gas liquefaction device provided by this invention is as follows:

[0065] When the inert gas to be liquefied collected by the front-end equipment (inert gas source storage device) enters the purifier 1, the purified gas is controlled by the PLC system to open the pneumatic valve 101 of the corresponding interlock switch of the bag condenser 2 as needed. The inert gas enters the PTFE cryogenic liquefaction bag 201 of the bag condenser 2. At this time, the shrinking PTFE cryogenic liquefaction bag 201 will be filled with gas and expand. When the gas fills to the set pressure, the liquefaction bag pressure gauge 207 on the PLC control system interlocks with the gas inlet switch to cut off the valve. Meanwhile, the check valve 211 on the second pipeline prevents gas backflow.

[0066] Before liquefaction, the refrigeration unit 3 is turned on to cool the refrigerant medium b to the set temperature. The PLC control system then interlocks with the variable frequency booster pump 301 to pump the cooled refrigerant medium b from the refrigeration unit 3 into the chilled water tank 202 of the bag filter condenser 2. As the chilled water tank 202 of the bag filter condenser 2 is gradually filled with refrigerant medium b, the refrigerant medium gauge 208 (pressure gauge) installed on the tank monitors the pressure in real time. When the gauge detects that the pressure reaches the set value, the PLC control system interlocks with the refrigerant medium regulating valve. Similarly, the thermometer on the device measures the temperature of the refrigerant medium in the chilled water tank 202 of the bag filter condenser 2 in real time. When the bag filter condenser 2 meets the set temperature and pressure (the temperature and pressure required for condensation and liquefaction), the booster pump 301 and the regulating valve opening are simultaneously controlled, allowing the refrigerant medium b to circulate and maintain low-temperature liquefaction while simultaneously providing pressure through a pressurization process.

[0067] Inert gas enters the shrinking PTFE cryogenic liquefaction bag 201, causing it to expand. The cryogenic freezing medium b is then circulated into the chilled water tank 202, maintaining the internal temperature of the chilled water tank 202 at the liquefaction critical point. Because the PTFE cryogenic liquefaction bag 201 is elastic, under the low temperature and high pressure of the freezing medium b, the gas in the liquefaction bag 201 slowly changes from a gaseous state to a liquid state. After liquefaction, the pressure in the PTFE cryogenic liquefaction bag 201 decreases. When the pressure is lower than the set value, the control system opens the interlock switch to continuously replenish the inert gas.

[0068] After liquefaction, the inert gas falls to the bottom of the liquefaction bag 201. At this time, the pressure of the liquefaction bag 201 forces the liquefied inert gas through the drain valve 206 into the storage tank 203 below the separation plate 204. When the liquid level gauge 210 detects that the liquid level in the storage tank 203 has reached a certain level, the interlock switch is activated to pump the collected liquefied gas into the gas cylinder 4.

[0069] The advantages of this solution compared to existing technologies include:

[0070] 1. By utilizing the expandable and contractile properties of the liquefaction bag 201 as a liquefaction container, the dual pressure formed by the pressurization of the inlet gas and the pressurization of the freezing medium b solves the energy loss caused by the need for a vacuum pump to draw negative pressure in existing steel structure containers, which results in gas being drawn away.

[0071] 2. The PLC control system simultaneously detects the temperature and pressure of the liquefaction bag 201 and the circulating refrigerant b, and automatically controls the booster pump 301 and the opening of the regulating valve to achieve the ideal environment for liquefaction. The storage tank 203 is equipped with a storage tank level gauge 210. The second control valve that can be automatically controlled is added to the gas cylinder 4, which greatly increases the reliability and automation of the equipment.

[0072] 3. The device is equipped with a check valve 211 to prevent gas from returning to the purifier 1 when the pressure in the liquefied bag 201 is too high. At the same time, the safety valve with the set pressure value will be automatically opened to return the gas to the front end of the purifier 1 for pressure relief, which greatly increases the safety of the equipment.

[0073] Protection point: Compared with traditional solutions, an inert gas liquefaction device and automation system are provided. It utilizes the principle of low temperature cooling to turn into liquid and uses a liquefaction bag 201 made of low temperature resistant fabric to liquefy gas. The automatic control frequency converter is connected to the PLC automatic control system. The equipment operates automatically and will automatically alarm and stop in case of abnormality. When the equipment is running, the real-time temperature, pressure, flow rate, etc. will be recorded on the PLC automatic control cabinet for easy investigation of abnormalities.

[0074] In summary, the purpose of this invention is to provide a device that can convert inert gas energy into liquid and collect it, thereby achieving efficient energy conversion, collection and utilization. The device uses a liquefaction bag 201 as a collection container that is resistant to low temperature, corrosion and high pressure. The liquefaction bag 201 itself has the characteristic of expansion and contraction when pressure is applied from the outside, which can better and more directly feed the temperature and pressure back to the liquefaction reaction, thereby better accelerating the liquefaction reaction.

[0075] The device used in this invention has a wide range of applications and strong compatibility, and can be used in various devices that require low-temperature cooling to liquefy the gas. This invention is suitable for liquefying various inert gases that can withstand the freezing temperature of PTFE low-temperature liquefaction bags 201 (-195℃) and alcohol (-117℃). This invention enables real-time monitoring of temperature and pressure data on the device by a PLC control system, facilitating data collection and eliminating the need for frequent on-site operations. The working environment of this invention is clean and environmentally friendly, and easy to clean. The safety system is comprehensive.

[0076] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0077] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0078] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0079] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0080] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0082] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An inert gas liquefaction device, characterized in that, include: Purifier, bag filter condenser, refrigeration unit and gas cylinder; The purifier is used to purify gaseous inert gas, the bag condenser is used to condense inert gas, and the refrigerator is used to freeze the medium. The purifier is provided with a first air inlet, an air outlet and a vacuum port. The bag condenser includes a chilled water tank, a stretchable liquefaction bag and a liquid storage tank. The chilled water tank is provided with a first liquid inlet and a first liquid outlet. The liquefaction bag is disposed in the chilled water tank. The liquefaction bag is provided with a second air inlet and a second liquid outlet. The liquid storage tank is provided with a second liquid inlet and a third liquid outlet. The first air inlet of the purifier is used to introduce inert gas, and the vacuum port is used to evacuate. The first air outlet is connected to the second air inlet of the liquefaction bag through a first pipe. A first control valve is connected in series on the first pipe. The second liquid outlet of the liquefaction bag is connected to the second liquid inlet of the liquid storage tank through a second pipe. A drain valve is connected in series on the second pipe. The third liquid outlet of the liquid storage tank is used to discharge inert gas in liquid state. The first liquid inlet of the chilled water tank is connected to the medium outlet of the chiller, and the first liquid outlet is connected to the medium inlet of the chiller.

2. The inert gas liquefaction device according to claim 1, characterized in that, It also includes a control system, wherein the liquefaction bag is equipped with a liquefaction bag pressure gauge for monitoring internal pressure, and the chilled water tank is equipped with a chilled medium instrument for monitoring internal pressure and temperature; The control system is used to control the opening degree of the first control valve according to the pressure of the liquefied bag pressure gauge and / or the temperature and pressure of the refrigerant instrument.

3. The inert gas liquefaction device according to claim 2, characterized in that, There are multiple bag condensers, and multiple first control valves are connected by interlocking switches.

4. The inert gas liquefaction device according to claim 2, characterized in that, A booster pump is provided between the first liquid inlet of the chilled water tank and the medium outlet of the chiller. The control system is also used to control the opening degree of the booster pump according to the pressure of the liquefied bag pressure gauge and / or the temperature and pressure of the chilled medium instrument.

5. The inert gas liquefaction device according to claim 2, characterized in that, It also includes a gas cylinder, which is connected to the third outlet of the liquid storage tank.

6. The inert gas liquefaction device according to claim 5, characterized in that, The number of gas cylinders is multiple.

7. The inert gas liquefaction device according to claim 5, characterized in that, A second control valve is provided between the gas cylinder and the third outlet of the liquid storage tank, and a liquid storage tank level gauge for detecting the liquid level is provided in the liquid storage tank. The control system is also used to control the second control valve to open when the liquid level gauge of the liquid storage tank detects that the liquid level in the liquid storage tank has reached a preset height.

8. The inert gas liquefaction device according to claim 2, characterized in that, The liquefied bag is equipped with a liquefied bag safety valve, and the control system is also used to open the liquefied bag safety valve when the internal pressure of the liquefied bag is greater than a preset pressure value.

9. The inert gas liquefaction device according to claim 1, characterized in that, The chilled water tank and the liquid storage tank are integrally formed cavity structures, and the cavity structure is divided into the chilled water tank and the liquid storage tank by a separation plate.

10. The inert gas liquefaction device according to claim 1, characterized in that, A check valve is connected in series on the first pipeline.

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