A test device and test method for thermal insulation wrapping of cryogenic equipment

Abstract

The present invention relates to a test device and test method for the thermal insulation wrapping of cryogenic equipment. The device comprises: a first container, comprising a first chamber, a second chamber and a third chamber arranged in sequence from top to bottom, the outer wall of each chamber is wrapped with a thermal insulation material of a first preset parameter, and each chamber is filled with a first liquid of a second preset parameter; a second liquid level gauge and a second liquid inlet pipe are arranged on the second chamber, and a second valve and a flow meter are arranged at one end of the second liquid inlet pipe away from the second chamber; a second container is sleeved on the outside of the first container, and the second container is used to provide a vacuum environment for the first container; during the test, the second valve is opened, and the evaporation time required for the first liquid in the second chamber to evaporate completely from the initial liquid level is recorded based on the second liquid level gauge and the flow meter, so as to characterize the thermal insulation effect of the first liquid under the thermal insulation material based on the evaporation time. The present application can determine a thermal insulation wrapping method with low heat leakage and high economy.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature testing, and in particular to a test device and a test method for a thermal insulation wrapping method of low-temperature equipment. Background Art

[0002] Low temperature vacuum cold boxes are widely used in the field of refrigeration. They can provide a vacuum environment for low temperature refrigeration equipment to prevent heat leakage in refrigeration equipment. According to the classification of heat transfer methods in thermodynamics, there are three types of heat conduction: gas heat conduction, radiation heat conduction and solid heat conduction. For gas heat conduction, in a low temperature vacuum cold box, when the vacuum degree of the cold box reaches 10 -4 At the Pa level, the thermal conductivity of the gas is already very small, and based on actual engineering experience, the heat leakage effect caused by gas heat conduction can be ignored. For solid heat conduction, according to the Fourier equation, heat conduction can be reduced by reducing the cross-sectional area of ​​the heat conductor and increasing the heat conduction distance, thereby reducing the heat leakage effect. There are mature technologies for these two heat leakage methods that can reduce their heat leakage to a negligible level.

[0003] As for radiation heat conduction, there are many factors that affect radiation heat leakage, such as the ambient temperature, the type of insulation material and the number of wrapping layers. Generally, the more wrapping layers there are, the better the insulation effect, but the manufacturing cost also increases significantly. In order to reduce radiation heat leakage, related technologies mostly select insulation materials and the number of wrapping layers based on experience, and are unable to determine an insulation method with low heat leakage and low manufacturing cost.

[0004] Therefore, there is an urgent need to provide a test device and a test method for the thermal insulation wrapping of low-temperature equipment to solve the above technical problems. Summary of the invention

[0005] The embodiment of the present invention provides a test device and a test method for the thermal insulation wrapping method of low-temperature equipment, which can determine the thermal insulation wrapping method with low heat leakage and high economy.

[0006] In a first aspect, an embodiment of the present invention provides a test device for a low-temperature equipment thermal insulation wrapping method, comprising:

[0007] The first container comprises a first chamber, a second chamber and a third chamber which are arranged in sequence from top to bottom, the outer wall of each chamber is wrapped with a heat-insulating material of a first preset parameter, and each chamber contains a first liquid of a second preset parameter; a second liquid level gauge and a second liquid inlet pipe are arranged on the second chamber, and a second valve and a flow meter are arranged at one end of the second liquid inlet pipe away from the second chamber; the first preset parameters include the type of the heat-insulating material and the number of wrapping layers; the second preset parameters include the type and temperature of the first liquid;

[0008] a second container, which is sleeved on the outside of the first container, and the second container is used to provide a vacuum environment for the first container;

[0009] During the test, the second valve is opened, and the evaporation time required for the first liquid in the second chamber to evaporate completely from the initial liquid level is recorded based on the second liquid level meter and the flow meter, so as to characterize the insulation effect of the first liquid under the insulation material based on the evaporation time.

[0010] In a second aspect, an embodiment of the present invention provides a test method for the thermal insulation wrapping method of cryogenic equipment, and a thermal insulation test is performed using the test device provided in the above embodiment. The method includes: sealing the second container in the third container, and evacuating the space between the third container and the second container;

[0011] Injecting a second liquid with a third preset parameter into the fourth chamber to simulate an ambient temperature based on the second liquid;

[0012] After wrapping the outer walls of the first chamber, the second chamber, and the third chamber with a heat-insulating material of a first preset parameter, sealing the second container inside the second container, and evacuating the space between the first container and the second container;

[0013] Injecting a first liquid with a second preset parameter into the first chamber, the second chamber, and the third chamber respectively;

[0014] Open the second valve to allow the first liquid in the second chamber to evaporate under the influence of heat radiation, monitor the second liquid level meter and the flow meter in real time, and record the evaporation time of the first liquid when the reading of the second liquid level meter is 0 and the accumulated flow of the flow meter no longer increases;

[0015] The thermal insulation effect of the first liquid of the second preset parameter at the ambient temperature simulated by the thermal insulation material of the first preset parameter and the second liquid of the third preset parameter is determined based on the evaporation time.

[0016] The embodiment of the present invention provides a test device and test method for the thermal insulation wrapping of low-temperature equipment, wherein the second chamber is used to simulate the low-temperature equipment, and the second container is used to simulate the cold box. By arranging the first chamber at the top of the second chamber, and the low-temperature first liquid is contained in the first chamber, the temperature of the second liquid level gauge and the second liquid inlet pipe can be maintained at the temperature of the first liquid by means of the coldness of the liquid in the first chamber, thereby reducing the heat conduction and heat leakage from the liquid level gauge and the liquid inlet pipe to the second chamber. By arranging the third chamber at the bottom of the second chamber, and the first liquid is contained in the third chamber, the temperature of the lower part of the second chamber can be maintained, thereby reducing the influence of the lower radiation heat leakage on the experimental data. That is to say, during the test, the evaporation of the first liquid in the second chamber has only one heat source, namely, the radiation heat leakage between the side wall of the second chamber and the second container, and the test results are only related to the number of wrapping layers and the type of thermal insulation material, and are not affected by other factors, thereby ensuring the accuracy of the test results. In addition, the longer the evaporation time, the lower the heat leakage, indicating that the thermal insulation effect of the thermal insulation material and the number of wrapping layers is better, and it can be used as the final wrapping method. It can be seen that the present application can determine an insulating wrapping method with low heat leakage and high economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a test device for a low-temperature equipment insulation wrapping method provided in one embodiment of the present invention.

[0019] Reference numerals:

[0020] 100-first container;

[0021] 101-first chamber; 102-second chamber; 103-third chamber; 104-second liquid level gauge; 105-second liquid inlet pipe; 106-second valve; 107-flow meter; 108-first liquid level gauge; 109-safety valve; 110-first liquid discharge pipe; 111-branch valve; 112-first liquid discharge valve; 113-third liquid inlet pipe; 114-third liquid discharge pipe; 115-third valve; 116-third liquid discharge valve;

[0022] 200 - second container;

[0023] 201-fourth chamber; 202-fourth liquid inlet pipe; 203-fourth valve; 204-fourth liquid discharge pipe; 205-fourth liquid discharge valve;

[0024] 300-third container; 301-vacuum pipe; 302-vacuum valve;

[0025] 400-first flange;

[0026] 500-second flange ring;

[0027] 600-third flange ring;

[0028] 700-Radiation screen. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, an embodiment of the present invention provides a test device for a low-temperature equipment insulation wrapping method, comprising:

[0031] The first container 100 comprises a first chamber 101, a second chamber 102 and a third chamber 103 arranged in sequence from top to bottom, the outer wall of each chamber is wrapped with a heat-insulating material of a first preset parameter, and each chamber contains a first liquid of a second preset parameter; a second liquid level gauge 104 and a second liquid inlet pipe 105 are arranged on the second chamber 102, and a second valve 106 and a flow meter 107 are arranged at one end of the second liquid inlet pipe 105 away from the second chamber 102; the first preset parameters include the type of the heat-insulating material and the number of wrapping layers; the second preset parameters include the type and temperature of the first liquid;

[0032] The second container 200 is sleeved on the outside of the first container 100, and the second container 200 is used to provide a vacuum environment for the first container 100;

[0033] During the test, the second valve 106 is opened, and the evaporation time required for the first liquid in the second chamber 102 to evaporate completely from the initial liquid level is recorded based on the second liquid level meter 104 and the flow meter 107, so as to characterize the insulation effect of the first liquid under the insulation material based on the evaporation time.

[0034] In this embodiment, the second chamber 102 is used to simulate low-temperature equipment, and the second container 200 is used to simulate a cold box. By arranging the first chamber 101 at the top of the second chamber 102, and the first chamber 101 is filled with a low-temperature first liquid, the temperature of the second liquid level gauge 104 and the second liquid inlet pipe 105 can be maintained at the temperature of the first liquid by means of the coldness of the liquid in the first chamber 101, and the heat conduction heat leakage from the liquid level gauge and the liquid inlet pipe to the second chamber 102 is reduced. By arranging the third chamber 103 at the bottom of the second chamber 102, and the third chamber 103 is filled with the first liquid, the temperature of the lower part of the second chamber 102 can be maintained, and the influence of the lower radiation heat leakage on the experimental data can be reduced. In other words, during the test, the evaporation of the first liquid in the second chamber 102 has only one heat source, that is, the radiation heat leakage between the side wall of the second chamber 102 and the second container 200, so the test results are only related to the number of wrapping layers and the type of insulation material, and are not affected by other factors, ensuring the accuracy of the test results. In addition, the longer the evaporation time is, the lower the radiation heat exchange between the first liquid and the second container is, which means that the insulation effect of the insulation material and the number of wrapping layers is better, which can be used as the final wrapping method, thereby determining an insulation wrapping method with low heat leakage and high economy.

[0035] It should be noted that the first liquid can be a cryogenic liquid such as liquid helium, liquid hydrogen, or liquid nitrogen, and the specific type and temperature can be determined according to user needs. The second liquid level gauge 104 and the second liquid inlet pipe 105 pass through the first chamber 101 and are connected to the outside. Figure 1 As shown, a branch can be provided on the second liquid inlet pipe 105, and a branch valve 111 is provided on the branch. When liquid needs to be injected into the second chamber 102, the branch valve 111 is opened to perform the liquid injection operation; during the test, the branch valve 111 is closed, the second valve 106 is opened, and the evaporated first liquid is discharged through the second valve 106. Of course, the second valve 106 can also take into account both the functions of liquid inlet and liquid discharge.

[0036] In addition, the third chamber 103 is preferably filled with the first liquid so that the liquid contacts the bottom of the second chamber, which can further ensure that the temperature of the lower part of the second chamber 102 is equal to the temperature of the first liquid. The height of the liquid in the first chamber 101 is not specifically limited as long as it is not zero.

[0037] In some embodiments, a first liquid level gauge 108 and a safety valve 109 are disposed at the top of the first chamber 101; when the pressure in the first chamber 101 is greater than a preset pressure, the safety valve 109 opens; a first liquid discharge pipe 110 is disposed at the bottom of the first chamber 101, and a first liquid discharge valve 112 is disposed on the first liquid discharge pipe 110, and the liquid in the first chamber 101 is discharged through the first liquid discharge valve 112;

[0038] A third liquid inlet pipe 113 and a third liquid discharge pipe 114 are provided on the third chamber 103; a third valve 115 is provided on one end of the third liquid inlet pipe 113 away from the third chamber 103, and the other end of the third liquid inlet pipe 113 is connected with the third chamber 103 after passing through the first chamber 101 and the second chamber 102, and a liquid outlet is provided on the side wall of the third liquid inlet pipe 113 located in the area where the first chamber 101 is located; the third liquid discharge pipe 114 is connected to the bottom end of the third chamber 103, and a third liquid discharge valve 116 is provided on the third liquid discharge pipe 114, and the liquid in the third chamber 103 is discharged through the third liquid discharge valve 116.

[0039] In this embodiment, the first liquid in the first chamber 101 can be discharged by setting the first liquid discharge pipe 110, which is conducive to replacing the medium in the first chamber 101. In addition, since the first chamber 101 has a large heat exchange with the external environment, the first liquid inside it will evaporate, resulting in an increase in the pressure in the first chamber 101. When the pressure exceeds the set value, the safety valve 109 opens to discharge the evaporated first liquid to ensure the safety of the equipment. In addition, by setting the first liquid level gauge 108, the liquid level of the first liquid in the first chamber 101 can also be detected. If there is no liquid in the first chamber 101, the second liquid inlet pipe 105 and the second liquid level gauge 104 will transfer heat to the second chamber 102, affecting the accuracy of the test results.

[0040] In addition, by setting a third liquid inlet pipe 113, and setting a liquid outlet on the side wall of the third liquid inlet pipe 113 in the area where the first chamber 101 is located, the first liquid can be filled into the third chamber 103 and the first chamber 101. Specifically, at the initial stage of liquid filling, the liquid first enters the third chamber 103 through the bottom outlet of the third liquid inlet pipe 113. When the third chamber 103 is full of liquid, the liquid enters the first chamber 101 through the liquid outlet to perform a liquid filling operation on the first chamber 101. By setting it in this way, on the one hand, there is no need to separately configure a liquid inlet pipe and a liquid inlet valve for the first chamber 101, which not only saves investment, but also reduces the heat leakage loss caused by setting the liquid inlet pipe. On the other hand, when it is observed that the first chamber 101 has a liquid level, it can be determined that the third chamber 103 is already full of liquid, so there is no need to separately configure a liquid level gauge for the third chamber 103, saving materials and avoiding heat leakage loss caused by setting the liquid level gauge.

[0041] The third liquid drain pipe 114 is provided to drain the first liquid in the third chamber 103 , which is beneficial for replacing the medium in the third chamber 103 .

[0042] In some embodiments, the second container 200 includes an inner shell and an outer shell, and a fourth chamber 201 is formed between the inner shell and the outer shell;

[0043] A fourth liquid inlet pipe 202 and a fourth valve 203 disposed on the fourth liquid inlet pipe 202 are disposed at the top of the fourth chamber 201, and a second liquid with a third preset parameter is injected into the fourth chamber 201 through the fourth liquid inlet pipe 202; the third preset parameter includes the type and temperature of the second liquid;

[0044] A fourth liquid discharge pipe 204 is disposed at the bottom end of the fourth chamber 201 , and a fourth liquid discharge valve 205 is disposed on the fourth liquid discharge pipe 204 , through which the liquid in the fourth chamber 201 is discharged.

[0045] In this embodiment, different ambient temperatures can be simulated by changing the type of the second liquid in the fourth chamber 201. For example, the second liquid can be liquid nitrogen, ice water, or 30°C normal temperature water, which are used to simulate ambient temperatures of -192°C, 0°C, and 30°C, respectively.

[0046] In some embodiments, a third container 300 is further included, which is sleeved on the outside of the second container 200 , and the third container 300 is used to provide a vacuum environment for the second container 200 .

[0047] In this embodiment, by providing the third container 300, the heat exchange between the second container 200 and the outside can be reduced, which is beneficial to maintaining the temperature of the fourth chamber 201 and making the simulated ambient temperature more accurate.

[0048] In some embodiments, the container further comprises a first flange 400, a second flange ring 500 and a third flange ring 600; the third flange ring 600 is disposed at the top of the third container 300, the bottom end of the second flange ring 500 is detachably sealed to the top of the third flange ring 600, and the bottom end of the first flange 400 is detachably sealed to the top of the second flange ring 500;

[0049] The third container 300 and the second container 200 are both provided with a vacuum pipe 301 and a vacuum valve 302 to vacuum the space between the third container 300 and the second container 200 and the space between the second container 200 and the first container 100 .

[0050] In this embodiment, the first flange 400, the second flange ring 500 and the third flange ring 600 are detachably connected. When the insulation material of the outer wall of the first container 100 needs to be replaced, the first flange 400 and the second flange ring 500 only need to be disassembled. Similarly, when the second container 200 needs to be replaced, the second flange ring 500 and the first flange 400 only need to be disassembled. In addition, O-rings are provided between the first flange 400 and the second flange ring 500, and between the second flange ring 500 and the third flange ring 600 to ensure sealing.

[0051] In some embodiments, a plurality of radiation screens 700 are disposed between the top of the first chamber 101 and the first flange 400 , and each radiation screen 700 is arranged at intervals in the vertical direction.

[0052] In this embodiment, if the radiation screen 700 is not provided, the first chamber 101 directly radiates heat exchange with the first flange 400, which will cause the temperature of the first chamber 101 to rise, accelerate the temperature rise and evaporation of the liquid in the first chamber 101, and accelerate the heat transfer 109 from the first chamber 101 to the second chamber 102, resulting in medium waste. In addition, the radiation screen 700 can be fixed by a top bracket provided on the first chamber 101, or the second liquid inlet pipe 105 or the second liquid level gauge 104 can be used as a support, and the present application does not specifically limit its installation method.

[0053] It should be noted that Figure 1 The arrangement of the first drain pipe 110, the third drain pipe 114, the fourth drain pipe 204 and the safety valve connecting pipe is only for illustration. In actual installation, the installation method of each pipe should not affect the disassembly and assembly of the first container 100 while satisfying their respective functions, that is, it should not affect the removal and loading of the first container 100 from the second container 200.

[0054] The embodiment of the present invention further provides a test method for the thermal insulation wrapping method of low-temperature equipment, using the test device provided in any of the above embodiments to conduct a thermal insulation test, the method comprising:

[0055] The second container 200 is sealed in the third container 300, and the space between the third container 300 and the second container 200 is evacuated;

[0056] Injecting a second liquid with a third preset parameter into the fourth chamber 201 to simulate an ambient temperature based on the second liquid;

[0057] After the outer walls of the first chamber 101, the second chamber 102, and the third chamber 103 are wrapped with a heat-insulating material of a first preset parameter, the second container 200 is sealed inside the second container 200, and the space between the first container 100 and the second container 200 is evacuated;

[0058] Injecting a first liquid with a second preset parameter into the first chamber 101, the second chamber 102, and the third chamber 103 respectively;

[0059] Open the second valve 106 to allow the first liquid in the second chamber 102 to evaporate under the influence of heat radiation, monitor the second liquid level meter 104 and the flow meter 107 in real time, and record the evaporation time of the first liquid when the reading of the second liquid level meter 104 is 0 and the accumulated flow of the flow meter 107 no longer increases;

[0060] The thermal insulation effect of the first liquid of the second preset parameter at the ambient temperature simulated by the thermal insulation material of the first preset parameter and the second liquid of the third preset parameter is determined based on the evaporation time.

[0061] In some embodiments, it further comprises:

[0062] Keeping the parameters of the second liquid, the parameters of the first liquid, the wrapping process and the number of wrapping layers unchanged;

[0063] Changing the type of thermal insulation material, and testing the evaporation time of the first liquid under each thermal insulation material;

[0064] Based on the obtained evaporation times, the thermal insulation effect of the first liquid under different thermal insulation materials at the same number of wrapping layers and the same ambient temperature is determined.

[0065] In some embodiments, it further comprises:

[0066] Keep the parameters of the second liquid, the parameters of the first liquid, the type of insulation material and the wrapping process unchanged;

[0067] Changing the number of wrapping layers, testing the evaporation time of the first liquid under different numbers of wrapping layers;

[0068] Based on the obtained evaporation times, the thermal insulation effect of the first liquid under different numbers of wrapping layers under the same thermal insulation material and the same ambient temperature is determined.

[0069] In some embodiments, it further comprises:

[0070] Keeping the parameters of the first liquid, the type of thermal insulation material, the number of wrapping layers and the wrapping process unchanged;

[0071] Changing the parameters of the second liquid, and testing the evaporation time of the first liquid at different ambient temperatures;

[0072] Based on the obtained evaporation times, the thermal insulation effect of the first liquid at different ambient temperatures under the same thermal insulation material and the same number of wrapping layers is determined.

[0073] In some embodiments, it further comprises:

[0074] Keep the parameters of the second liquid, the type of thermal insulation material, the wrapping process and the number of wrapping layers unchanged;

[0075] Changing the type of the first liquid and testing the evaporation time of each first liquid;

[0076] Based on the obtained evaporation times, evaporation data of each first liquid under the same insulation material, the same number of wrapping layers and the same ambient temperature are determined.

[0077] It should be noted that, through the combination of the above tests, we can obtain the evaporation rate of the same first liquid under different numbers of insulating wrapping materials; the evaporation data of the same first liquid under different ambient temperatures and different numbers of insulating wrapping layers; the evaporation data of first liquids with different boiling points under different numbers of wrapping layers, etc.

[0078] It should also be noted that by controlling and measuring the consistency of the first liquid, the consistency of the ambient temperature, and the consistency of the number of insulation wrapping layers, and using insulation wrapping materials from different manufacturers and models for wrapping, it is possible to measure the quality of thermal radiation isolation of different insulation wrapping materials, thereby providing data support for the selection of insulation wrapping materials for cryogenic equipment.

[0079] Finally, through comprehensive experiments in four dimensions, including different insulation wrapping materials, different first liquids, different ambient temperatures, and different numbers of insulation wrapping layers, the optimal solution for the number of wrapping layers of first liquids with different boiling points at different ambient temperatures can be obtained, providing guidance for engineering applications.

[0080] It should be noted that the test method for the insulation wrapping method of low-temperature equipment provided in this embodiment and the test device for the insulation wrapping method of low-temperature equipment provided in the above embodiment are based on the same inventive concept, so the two have the same beneficial effects and will not be repeated here.

[0081] 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 such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the existence of other identical factors in the process, method, article or equipment including the elements.

[0082] Finally, it should be noted that the above is only a preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A test device for thermal insulation wrapping of low temperature equipment, characterized in that: include: A first container (100) comprises a first chamber (101), a second chamber (102) and a third chamber (103) which are arranged in sequence from top to bottom, the outer wall of each chamber is wrapped with a heat-insulating material of a first preset parameter, and each chamber contains a first liquid of a second preset parameter; a second liquid level gauge (104) and a second liquid inlet pipe (105) are arranged on the second chamber (102), and a second valve (106) and a flow meter (107) are arranged at one end of the second liquid inlet pipe (105) away from the second chamber (102); the first preset parameters include the type of the heat-insulating material and the number of wrapping layers; the second preset parameters include the type and temperature of the first liquid; A second container (200) is sleeved on the outside of the first container (100), and the second container (200) is used to provide a vacuum environment for the first container (100); During the test, the second valve (106) is opened, and the evaporation time required for the first liquid in the second chamber (102) to evaporate completely from an initial liquid level is recorded based on the second liquid level meter (104) and the flow meter (107), so as to characterize the thermal insulation effect of the first liquid under the thermal insulation material based on the evaporation time; A first liquid level gauge (108) and a safety valve (109) are arranged at the top end of the first chamber (101); when the pressure in the first chamber (101) is greater than a preset pressure, the safety valve (109) opens; a first liquid discharge pipe (110) is arranged at the bottom end of the first chamber (101); a first liquid discharge valve (112) is arranged on the first liquid discharge pipe (110); and liquid in the first chamber (101) is discharged through the first liquid discharge valve (112); The third chamber (103) is provided with a third liquid inlet pipe (113) and a third liquid discharge pipe (114); a third valve (115) is provided at one end of the third liquid inlet pipe (113) away from the third chamber (103); the other end of the third liquid inlet pipe (113) passes through the first chamber (101) and the second chamber (102) and is communicated with the third chamber (103); a liquid outlet hole is provided on the side wall of the third liquid inlet pipe (113) in the area where the first chamber (101) is located; the third liquid discharge pipe (114) is connected to the bottom end of the third chamber (103), and a third liquid discharge valve (116) is provided on the third liquid discharge pipe (114); the liquid in the third chamber (103) is discharged through the third liquid discharge valve (116); The second container (200) comprises an inner shell and an outer shell, and a fourth chamber (201) is formed between the inner shell and the outer shell; A fourth liquid inlet pipe (202) and a fourth valve (203) arranged on the fourth liquid inlet pipe (202) are arranged at the top of the fourth chamber (201), and a second liquid with a third preset parameter is injected into the fourth chamber (201) through the fourth liquid inlet pipe (202); the third preset parameter includes the type and temperature of the second liquid; A fourth liquid discharge pipe (204) is provided at the bottom end of the fourth chamber (201), and a fourth liquid discharge valve (205) is provided on the fourth liquid discharge pipe (204), and the liquid in the fourth chamber (201) is discharged through the fourth liquid discharge valve (205); It also includes a third container (300) which is sleeved on the outside of the second container (200), and the third container (300) is used to provide a vacuum environment for the second container (200); It also includes a first flange (400), a second flange ring (500) and a third flange ring (600); the third flange ring (600) is arranged at the top of the third container (300), the bottom end of the second flange ring (500) is detachably sealed to the top of the third flange ring (600), and the bottom end of the first flange (400) is detachably sealed to the top of the second flange ring (500); The third container (300) and the second container (200) are both provided with a vacuum pipe (301) and a vacuum valve (302) to vacuum the space between the third container (300) and the second container (200), and the space between the second container (200) and the first container (100); When working, the thermal insulation test is carried out using the test device in the following way: The second container (200) is sealed in the third container (300), and the space between the third container (300) and the second container (200) is evacuated; Injecting a second liquid with a third preset parameter into the fourth chamber (201) to simulate an ambient temperature based on the second liquid; After wrapping the outer walls of the first chamber (101), the second chamber (102) and the third chamber (103) with a heat-insulating material having a first preset parameter, the second container (200) is sealed inside the second container (200), and the space between the first container (100) and the second container (200) is evacuated; Injecting a first liquid with a second preset parameter into the first chamber (101), the second chamber (102), and the third chamber (103) respectively; Opening the second valve (106) to allow the first liquid in the second chamber (102) to evaporate under the influence of heat radiation, monitoring the second liquid level meter (104) and the flow meter (107) in real time, and recording the evaporation time of the first liquid when the reading of the second liquid level meter (104) is 0 and the accumulated flow of the flow meter (107) no longer increases; The thermal insulation effect of the first liquid of the second preset parameter at the ambient temperature simulated by the thermal insulation material of the first preset parameter and the second liquid of the third preset parameter is determined based on the evaporation time.

2. The device according to claim 1, characterized in that A plurality of radiation screens (700) are arranged between the top end of the first chamber (101) and the first flange (400), and each radiation screen (700) is arranged at intervals in the vertical direction.

3. A test method for thermal insulation wrapping of cryogenic equipment, characterized in that: A thermal insulation test is performed using the test device according to any one of claims 1 or 2, the method comprising: The second container (200) is sealed in the third container (300), and the space between the third container (300) and the second container (200) is evacuated; Injecting a second liquid with a third preset parameter into the fourth chamber (201) to simulate an ambient temperature based on the second liquid; After wrapping the outer walls of the first chamber (101), the second chamber (102) and the third chamber (103) with a heat-insulating material having a first preset parameter, the second container (200) is sealed inside the second container (200), and the space between the first container (100) and the second container (200) is evacuated; Injecting a first liquid with a second preset parameter into the first chamber (101), the second chamber (102), and the third chamber (103) respectively; Opening the second valve (106) to allow the first liquid in the second chamber (102) to evaporate under the influence of heat radiation, monitoring the second liquid level meter (104) and the flow meter (107) in real time, and recording the evaporation time of the first liquid when the reading of the second liquid level meter (104) is 0 and the accumulated flow of the flow meter (107) no longer increases; The thermal insulation effect of the first liquid of the second preset parameter at the ambient temperature simulated by the thermal insulation material of the first preset parameter and the second liquid of the third preset parameter is determined based on the evaporation time.

4. The method according to claim 3, characterized in that Also includes: Keeping the parameters of the second liquid, the parameters of the first liquid, the wrapping process and the number of wrapping layers unchanged; Changing the type of thermal insulation material, and testing the evaporation time of the first liquid under each thermal insulation material; Based on the obtained evaporation times, the thermal insulation effect of the first liquid under different thermal insulation materials at the same number of wrapping layers and the same ambient temperature is determined.

5. The method according to claim 3, characterized in that: Also includes: Keep the parameters of the second liquid, the parameters of the first liquid, the type of insulation material and the wrapping process unchanged; Changing the number of wrapping layers, testing the evaporation time of the first liquid under different numbers of wrapping layers; Based on the obtained evaporation times, the thermal insulation effect of the first liquid under different numbers of wrapping layers under the same thermal insulation material and the same ambient temperature is determined.

6. The method according to claim 3, characterized in that Also includes: Keeping the parameters of the first liquid, the type of thermal insulation material, the number of wrapping layers and the wrapping process unchanged; Changing the parameters of the second liquid, and testing the evaporation time of the first liquid at different ambient temperatures; Based on the obtained evaporation times, the thermal insulation effect of the first liquid at different ambient temperatures under the same thermal insulation material and the same number of wrapping layers is determined.

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