Device and method for testing heat conductivity coefficient of multi-layer heat insulation material of cryogenic storage and transportation equipment

Abstract

The invention discloses a device and a method for testing the heat conductivity coefficient of a multi-layer heat insulation material of cryogenic storage and transportation equipment, and belongs to the technical field of cryogenic storage and transportation equipment. The device for testing the heat conductivity coefficient of the multi-layer heat insulation material of the cryogenic storage and transportation equipment comprises an outer tank, an inner tank and an inner tank, the inner tank is detachably arranged in the outer tank, and a heat insulation material winding area is arranged on the outer side wall of the inner tank and used for arranging a heat insulation material layer; the refrigerant liquid storage assembly is connected with the inner tank and used for filling liquid gas into the inner tank; the evaporation capacity measuring instrument is connected with the inner tank and is used for measuring the evaporation capacity of the liquid gas in the inner tank; and the temperature detection assembly is arranged in the outer tank so as to measure the temperature of the inner side and the outer side of the heat insulation material layer. The testing device and method provided by the invention can improve the reliability of the measurement of the heat conductivity coefficient of the multi-layer thermal insulation material of the cryogenic storage and transportation equipment.

Description

Technical Field

[0001] The present application belongs to the technical field of cryogenic storage and transportation equipment, and in particular, relates to a device and method for testing the thermal conductivity of multi-layer insulation materials of cryogenic storage and transportation equipment. Background Art

[0002] The multi-layer insulation material composed of glass fiber paper and aluminum foil alternately stacked has good thermal insulation performance, so it is widely used in cryogenic storage and transportation equipment. In the design and processing of the thermal insulation structure of cryogenic storage and transportation equipment, especially in the design and processing of new products, it is necessary to fully consider the thermal conductivity, coverage area, thickness, coverage form and other comprehensive factors of the thermal insulation structure.

[0003] In the prior art, when considering thermal insulation structures, the heat conduction efficiency is mainly determined by conducting heating and temperature measurement tests on samples of thermal insulation materials, and then designing parameters such as coverage area, thickness, and form based on the heat conduction efficiency. However, when multi-layer thermal insulation materials are installed on cryogenic storage and transportation equipment, problems such as uneven thermal insulation performance, unreliable local thermal insulation performance, and unstable overall thermal insulation performance are prone to occur. Summary of the invention

[0004] The present application provides a device and method for testing the thermal conductivity of multi-layer insulation materials for cryogenic storage and transportation equipment, aiming to at least to some extent solve the technical problems of unreliable thermal conductivity measurement of multi-layer insulation materials for cryogenic storage and transportation equipment, and unreliable and unstable thermal insulation performance of cryogenic storage and transportation equipment.

[0005] In one aspect of an embodiment of the present application, a device for testing thermal conductivity of multilayer insulation materials of cryogenic storage and transportation equipment is provided, comprising:

[0006] The outer tank is provided with a vacuum extraction interface;

[0007] An inner tank is detachably arranged in the outer tank, and a heat insulation material winding area is arranged on the outer side wall of the inner tank for arranging a heat insulation material layer;

[0008] a refrigerant liquid storage assembly connected to the inner tank for filling the contents with liquid gas;

[0009] an evaporation amount measuring instrument, connected to the inner tank, for measuring the evaporation amount of the liquid gas in the inner tank;

[0010] The temperature detection component is arranged in the outer tank to measure the inner and outer temperatures of the thermal insulation material layer.

[0011] In some embodiments, the refrigerant liquid storage assembly includes:

[0012] Fluid storage tank;

[0013] An infusion pipeline has one end connected to the liquid storage tank and the other end arranged at the lower part of the inner cavity of the inner tank.

[0014] In some embodiments, the evaporation meter is connected to the inner tank via an evaporation line, and the evaporation line is connected to the top of the contents.

[0015] In some embodiments, the liquid gas includes liquid oxygen, liquid nitrogen, liquid argon, or carbon dioxide.

[0016] In some embodiments, the temperature detection component includes:

[0017] A first temperature sensor is attached to the inner side of the thermal insulation material layer;

[0018] The second temperature sensor is attached to the outer side of the thermal insulation material layer.

[0019] In some embodiments, the outer tank comprises: a bottom sealing seat, an outer cylinder and a top sealing cover;

[0020] The bottom sealing seat is connected to the lower port of the outer cylinder, and the top sealing cover is detachably connected to the upper port of the outer cylinder to form a closed test cavity;

[0021] The inner tank is arranged in the test cavity.

[0022] In some embodiments, the inner tank comprises: a lower insulation seat, an inner cylinder and an upper insulation seat;

[0023] The lower insulation seat is arranged on the bottom sealing seat, and the lower insulation seat is connected to the lower port of the inner cylinder;

[0024] The upper insulation seat is connected to the upper port of the inner cylinder;

[0025] Wherein, the outer peripheral surface of the inner cylinder is set as the insulation material winding area.

[0026] In some embodiments, the testing device further includes a vacuum pumping unit, and the vacuum pumping unit is connected to the vacuum pumping interface.

[0027] In some embodiments, the testing device further includes a field control host, and the field control host is respectively connected to the refrigerant liquid storage component, the evaporation measurement instrument, and the temperature detection component.

[0028] In another aspect of the embodiment of the present application, a method for testing the thermal conductivity of multilayer insulation materials of cryogenic storage and transportation equipment is provided, and the testing steps are implemented based on the testing device;

[0029] The testing steps include:

[0030] According to the set winding method and thickness, multiple layers of thermal insulation material are wound in the thermal insulation material winding area, and the temperature sensing element of the temperature detection assembly is arranged inside the multiple layers of thermal insulation material;

[0031] Installing an inner tank wrapped with multiple layers of thermal insulation material into the outer tank;

[0032] The area between the outer tank and the inner tank is evacuated to a vacuum with a degree of vacuum higher than 1×10-2Pa;

[0033] Filling the inner tank with a set amount of liquid gas;

[0034] After the system is stable, the evaporation amount of the liquid gas within a set time is measured using the evaporation amount measuring instrument, and the inner boundary temperature and the outer boundary temperature of the thermal insulation material layer within the set time are measured using the temperature detection component;

[0035] The thermal conductivity of the multilayer insulation material is obtained based on the evaporation amount of the liquid gas, the inner boundary temperature and the outer boundary temperature.

[0036] The embodiments of the present application have at least the following beneficial effects:

[0037] The embodiment of the present application provides a device and method for testing the thermal conductivity of multi-layer insulation materials of cryogenic storage and transportation equipment, comprising an outer tank, an inner tank, a refrigerant liquid storage component, an evaporation meter and a temperature detection component; the outer tank is provided with a vacuum interface, and the inner tank is arranged inside the outer tank, so that the space between the outer tank and the inner tank can be evacuated into a vacuum through the vacuum machine component to simulate the vacuum environment of the cryogenic storage and transportation equipment, thereby improving the measurement reliability to a certain extent; the refrigerant liquid storage component and the evaporation meter are respectively connected to the inner tank to mainly fill the inner tank with a set amount of liquid air, and monitor the evaporation amount within a set time in real time, so as to characterize the heat conduction effect; at the same time, the boundary temperatures on both sides of the inner and outer sides of the insulation material layer within the set time are monitored in real time through the temperature detection component, so as to cooperate with the evaporation amount within the set time, so as to comprehensively characterize the heat transfer effect per unit time, and the corresponding thermal conductivity coefficient can be obtained based on the evaporation amount within the set time and the boundary temperatures on both sides of the inner and outer sides of the insulation material layer. It is worth mentioning that by restoring the vacuum gap between the inner and outer cylinders of the cryogenic storage and transportation equipment, as well as the change in the storage state after the inner cylinder absorbs heat, that is, the endothermic evaporation phenomenon, the heat transfer inside and outside the cryogenic storage and transportation equipment is simulated, and the thermal insulation effect is characterized by quantifying the evaporation amount and the inner and outer temperatures of the thermal insulation material layer. The thermal conductivity of the entire thermal insulation material layer wrapped around the inner tank can also be determined based on the quantitative parameters, thereby guiding the product design with high reliability and obtaining stable and reliable thermal insulation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram of the structure of a multi-layer insulation material thermal conductivity testing device for cryogenic storage and transportation equipment in an embodiment of the present application is shown;

[0040] Figure 2 Shows Figure 1 Schematic diagram of the control architecture of the test device in FIG.

[0041] Reference numerals:

[0042] 1-outer tank, 11-outer cylinder, 11a-vacuum interface, 12-bottom sealing seat, 13-top sealing cover, 14-diagonal support;

[0043] 2-inner tank, 21-inner cylinder, 22-lower insulation seat, 23-upper insulation seat;

[0044] 3-refrigerant liquid storage assembly, 31-liquid storage tank, 32-infusion pipeline;

[0045] 4-evaporation measuring instrument, 41-evaporation pipeline;

[0046] 5-temperature detection component, 51-first temperature sensor, 52-second temperature sensor;

[0047] 6- Vacuum unit;

[0048] 7- thermal insulation material layer;

[0049] 8- On-site control host. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0052] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0053] A layer of thermal insulation material is usually wound around the outer wall of the inner cylinder of cryogenic storage and transportation equipment. Various forms of thermal insulation materials are often used, such as a multi-layer thermal insulation material composed of glass fiber paper and aluminum foil alternately stacked. In addition, the winding form and thickness of the thermal insulation material layer required for thermal insulation are usually determined based on the thermal conductivity of the thermal insulation material sample, and the thermal conductivity is determined by a heating test of a sample of a certain specification. This simple material thermal conductivity measurement test can only reflect the properties of the material itself, and cannot directly reflect the thermal insulation performance after being assembled in cryogenic storage and transportation equipment, making the thermal conductivity measurement of the multi-layer thermal insulation material of cryogenic storage and transportation equipment unreliable, and prone to unreliable and unstable technical problems in the thermal insulation performance of cryogenic storage and transportation equipment.

[0054] To this end, the present application provides a device and method for testing the thermal conductivity of multi-layer insulation materials for cryogenic storage and transportation equipment, aiming to improve the reliability and accuracy of the thermal conductivity test of multi-layer insulation materials for cryogenic storage and transportation equipment to a certain extent.

[0055] See also Figure 1 and Figure 2 In some embodiments, a thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment simulates the structural form of the cryogenic storage and transportation equipment and the evaporation of the contents stored therein to measure the thermal conductivity of the insulation material layer, thereby obtaining an accurate and reliable thermal conductivity.

[0056] Specifically, the thermal conductivity testing device of the multi-layer insulation material of the cryogenic storage and transportation equipment includes: an outer tank 1, an inner tank 2, a refrigerant liquid storage component 3, an evaporation amount measuring instrument 4 and a temperature detection component 5; the inner tank 2 is arranged in the outer tank 1, the refrigerant liquid storage component 3 is connected to the inner tank 2, the evaporation amount measuring instrument 4 is connected to the inner tank 2, and the temperature detection component 5 is arranged in the outer tank 1.

[0057] Among them, the outer tank 1 is used to construct the vacuum environment of the test device and simulate the outer tank body of the double-layer tank body of the cryogenic storage and transportation equipment; the outer tank 1 is provided with a vacuum interface 11a, which is used to cooperate with the vacuum unit 6 to evacuate the inside of the outer tank 1, thereby simulating the vacuum space of the outer tank body of the cryogenic storage and transportation equipment.

[0058] The inner tank 2 is used to contain liquid gas and simulate the inner tank body of cryogenic storage and transportation equipment. The outer wall of the inner tank 2 is provided with a corresponding area for winding the thermal insulation material layer 7, namely, the thermal insulation material winding area. When conducting a thermal conductivity test of a multi-layer thermal insulation material of cryogenic storage and transportation equipment, the multi-layer thermal insulation material can be wound around the thermal insulation material winding area of ​​the outer wall of the inner tank 2 to form the thermal insulation material layer 7.

[0059] The refrigerant liquid storage assembly 3 is connected to the inner tank 2 , and liquid gas is stored therein. A set amount of liquid gas is added to the inner tank 2 according to test requirements.

[0060] The evaporation amount measuring instrument 4 is connected to the inner tank 2 to measure the evaporation amount of the liquid gas in the inner tank 2 , thereby characterizing the heat absorption condition in the inner tank 2 .

[0061] The temperature detection component 5 is arranged in the outer tank 1, and the temperature detection component 5 has at least two temperature sensing elements; in the test preparation stage, at least two temperature sensing elements of the temperature detection component 5 are respectively arranged on the inner and outer sides of the thermal insulation material layer 7 to measure the boundary temperatures on both sides of the inner and outer sides of the thermal insulation material layer 7.

[0062] It is worth noting that in the preparation stage of the thermal conductivity test of the multi-layer insulation material of the cryogenic storage and transportation equipment, one temperature sensing element of the temperature detection assembly 5 can be wrapped between the inner side of the insulation material layer 7 and the outer side wall of the inner tank 2, and the other temperature sensing element of the temperature detection assembly 5 can be set on the outside of the insulation material layer 7; then the inner tank 2 is placed in the outer tank 1, and then the vacuum pumping unit 6 is connected to the vacuum pumping interface 11a to evacuate the internal space of the outer tank 1 to reduce the heat transfer medium between the inner tank 2.

[0063] When implementing the test operation, liquid gas is first added to the inner tank 2 through the refrigerant liquid storage component. After stabilization, the evaporation amount of the liquid gas in the inner tank 2 detected by the evaporation meter 4 within the set time and the temperature on both sides of the insulation material layer 7 monitored by the stability detection component 5 are recorded.

[0064] The embodiment of the present application provides a device and method for testing the thermal conductivity of multi-layer insulation materials of cryogenic storage and transportation equipment, comprising an outer tank, an inner tank, a refrigerant liquid storage component, an evaporation meter and a temperature detection component; the outer tank is provided with a vacuum interface, and the inner tank is arranged inside the outer tank, so that the space between the outer tank and the inner tank can be evacuated into a vacuum through the vacuum machine component to simulate the vacuum environment of the cryogenic storage and transportation equipment, thereby improving the measurement reliability to a certain extent; the refrigerant liquid storage component and the evaporation meter are respectively connected to the inner tank to mainly fill the inner tank with a set amount of liquid air, and monitor the evaporation amount within a set time in real time, so as to characterize the heat conduction effect; at the same time, the boundary temperatures on both sides of the inner and outer sides of the insulation material layer within the set time are monitored in real time through the temperature detection component, so as to cooperate with the evaporation amount within the set time, so as to comprehensively characterize the heat transfer effect per unit time, and the corresponding thermal conductivity coefficient can be obtained based on the evaporation amount within the set time and the boundary temperatures on both sides of the inner and outer sides of the insulation material layer. It is worth mentioning that by restoring the vacuum gap between the inner and outer cylinders of the cryogenic storage and transportation equipment, as well as the change in the storage state after the inner cylinder absorbs heat, that is, the endothermic evaporation phenomenon, the heat transfer inside and outside the cryogenic storage and transportation equipment is simulated, and the thermal insulation effect is characterized by quantifying the evaporation amount and the inner and outer temperatures of the thermal insulation material layer. The thermal conductivity of the entire thermal insulation material layer wrapped around the inner tank can also be determined based on the quantitative parameters, thereby guiding the product design with high reliability and obtaining stable and reliable thermal insulation effects.

[0065] In some embodiments, in order to stably add liquid gas to the inner tank 2 , the refrigerant liquid storage assembly 3 may include a liquid storage tank 31 and a liquid infusion pipeline 32 , and the liquid storage tank 31 is connected to the inner tank 2 via the liquid infusion pipeline 32 .

[0066] The liquid storage tank 31 stores liquid gas, and the liquid gas can be added into the inner tank 2 through the liquid infusion pipeline 32 .

[0067] It is worth noting that the liquid storage tank 31 is equipped with a control valve group, a flow meter and other components to control the output flow.

[0068] Generally speaking, one end of the infusion pipeline 32 can be connected to the liquid storage tank 31, and the other end can be extended to the lower part or bottom of the inner tank 2, so that the filled liquid gas can be stably stored in the lower part of the liquid storage tank 31, reducing the amplitude of liquid gas oscillation and reducing interference with evaporation measurement.

[0069] In some embodiments, the evaporation meter 4 is connected to the inner tank 2 through an evaporation pipeline 41, so that the evaporated liquid gas can enter the evaporation meter 4 through the evaporation pipeline 41, thereby quantifying the evaporation amount.

[0070] Alternatively, the evaporation amount measuring instrument 4 may also adopt an evaporation amount sensor similar to a liquid level meter, which is arranged in the inner tank 2 to quantify the evaporation amount by detecting the liquid level of the liquid gas.

[0071] Other forms or principles of evaporation measuring instruments may also be used.

[0072] In some embodiments, the liquid gas may be liquid oxygen, liquid nitrogen, liquid argon or carbon dioxide, thereby taking both thermal sensitivity and safety into consideration.

[0073] In some embodiments, in order to facilitate the temperature detection component 5 to detect the temperatures on both sides of the inside and outside of the thermal insulation material layer 7, the temperature detection component 5 may include an attached first temperature sensor 51 and a second temperature sensor 52, which can be respectively attached to the inner and outer surfaces of the thermal insulation material layer 7 to stably detect the temperature.

[0074] The first temperature sensor 51 and the second temperature sensor 52 can be connected to an external data processing terminal, such as a field controller or other equipment, respectively, to obtain the boundary temperatures of the inner and outer sides of the thermal insulation material layer 7 in real time.

[0075] In some embodiments, considering that in the test device, the thermal insulation material layer 7 needs to be wound, and the temperature detection assembly 5 and the inner tank 2 need to be installed, the outer tank 1 can be configured to be openable and closable.

[0076] Specifically, the outer tank 1 may include an outer cylinder 11, a bottom sealing seat 12, and a top sealing cover 13. The bottom sealing seat 12 is connected to the lower port of the outer cylinder 11, and the top sealing cover 13 is detachably connected to the upper port of the outer cylinder 11, so that the outer tank 1 can be opened and closed as needed.

[0077] Generally speaking, the closed cylindrical cavity surrounded by the outer cylinder 11 , the bottom sealing seat 12 and the top sealing cover 13 serves as a test cavity for accommodating the inner tank 2 .

[0078] The vacuum port 11a may be provided on the outer cylinder 11 and communicated with the inner cavity of the outer tank 1. Alternatively, the vacuum port 11a may also be provided on the bottom sealing seat 12 or the top sealing cover 13, and no specific limitation is made here.

[0079] In some embodiments, a diagonal brace 14 may be provided between the outer cylinder 11 and the bottom sealing seat 12 to strengthen the connection between the outer cylinder 11 and the bottom sealing seat 12 .

[0080] In some embodiments, considering that the inner tank 2 needs to store refrigerant and measure the thermal conductivity of the insulation material layer 7, in order to avoid heat transfer from other regional structures interfering with the test accuracy, the inner tank 2 may include: an inner cylinder 21, a lower insulation seat 22 and an upper insulation seat 23.

[0081] The outer circumferential surface of the inner cylinder 21 serves as a winding area for the heat insulating material, and can be wound with heat insulating material layers 7 of various forms and specifications.

[0082] The lower insulation seat 22 is arranged on the bottom sealing seat 12, and the lower insulation seat 22 is connected to the lower port of the inner cylinder 21 to isolate the contact heat transfer between the inner cylinder 21 and the outer cylinder 11; the upper insulation seat 23 is connected to the upper port of the inner cylinder 21. In other words, the heat transfer of the area except the inner cylinder 21 is strictly controlled, so as to avoid affecting the measurement of the thermal conductivity of the insulation material layer 7 wound on the inner cylinder 21.

[0083] In some embodiments, in order to avoid affecting the integrity and sealing of the inner cylinder 21 , the infusion pipeline 32 and the evaporation pipeline 41 may be passed through the upper insulation seat 23 .

[0084] It is worth noting that the inner cylinder 21, the lower insulation seat 22 and the upper insulation seat 23 can adopt a split structure, so as to facilitate installation; the lower insulation seat 22 can be installed on the bottom sealing seat 12 first, and then the inner cylinder 21 wrapped with the insulation material layer 7 can be sealed and installed on the bottom sealing seat 12, and then the upper insulation seat 22 can be installed on the upper port of the inner cylinder 21.

[0085] In some embodiments, in order to improve the degree of automation of the testing device, the testing device may also include a field control host 8, which is connected to the refrigerant liquid storage component 3, the evaporation meter 4 and the temperature detection component 5 to control the filling operation of the refrigerant liquid storage component 3, and receive the evaporation signal sent back by the evaporation meter 4, and the inner and outer boundary temperature signals of the thermal insulation material layer 7 sent back by the temperature detection component 5.

[0086] In some embodiments, a method for testing the thermal conductivity of multi-layer insulation materials of cryogenic storage and transportation equipment is also provided. Based on the above-mentioned testing device, the testing steps are implemented according to the set timing.

[0087] The testing steps include:

[0088] According to the set winding method and thickness, multiple layers of thermal insulation material are wound on the outer wall of the inner tank 2, specifically in the thermal insulation material winding area, and the temperature sensing element of the temperature detection assembly 5 is arranged on the inner side of the multiple layers of thermal insulation material layer 7;

[0089] Install the inner tank 2 wrapped with multiple layers of insulation material into the outer tank 1;

[0090] The area between the outer tank 1 and the inner tank 2 is evacuated to a vacuum with a vacuum degree higher than 1×10 -2 Pa;

[0091] Filling a set amount of liquid gas into the inner tank 2;

[0092] After the system is stable, the evaporation amount of the liquid gas within the set time is measured by the evaporation amount measuring instrument 4, and the inner boundary temperature and the outer boundary temperature of the thermal insulation material layer 7 within the set time are measured by the temperature detection component 5;

[0093] The thermal conductivity of the multi-layer insulation material layer 7 is obtained based on the evaporation amount of the liquid gas, the inner boundary temperature and the outer boundary temperature.

[0094] It is worth noting that in the product design process of cryogenic storage and transportation equipment, the winding form and thickness of the thermal insulation material layer 7 need to be fully considered, so as to take into account various factors such as thermal insulation performance, product cost, and production and processing efficiency.

[0095] Simply considering the thermal conductivity of the multi-layer thermal insulation material itself cannot obtain the thermal conductivity of the thermal insulation material layer 7 after productization, which makes the thermal insulation performance of the thermal insulation measurement layer 7 unreliable.

[0096] To this end, by testing factors such as the winding form and overall thickness of the multi-layer insulation material through the above-mentioned testing device, the reliability of the thermal insulation effect of the productized deep-cold storage and transportation equipment can be effectively improved.

[0097] In some embodiments, in order to accurately obtain the thermal conductivity, the boundary temperature and evaporation amount can be set as the average value within a set time; that is, the average value of the inner boundary temperature Tc and the average value of the outer boundary temperature Tc of the thermal insulation material layer within a set time. h And the average evaporation value q m , as a benchmark for determining the thermal conductivity parameter of the thermal insulation material layer 7.

[0098] This embodiment also provides a thermal conductivity conversion formula:

[0099]

[0100] Where: λ—thermal conductivity, unit is watt per meter Kelvin, W / (m·K);

[0101] q m —The average value of nitrogen evaporation mass within 1 hour, in kilograms per second, kg / s;

[0102] h—latent heat of vaporization of liquid nitrogen under experimental ambient pressure, in joules per kilogram, J / kg;

[0103] T h —The average value of thermal boundary temperature within 1 hour, in degrees Kelvin;

[0104] Tc—average value of cold boundary temperature within 1 hour, in degrees Kelvin, K;

[0105] r—outer radius of the inner cylinder, in meters;

[0106] δ—the thickness of the insulation material, in meters;

[0107] l—The length of the side wall of the inner cylinder, in meters.

[0108] Generally speaking, the conversion model based on the above formula can be set in the field control host 8 to convert the measured inner boundary temperature average value Tc and the outer boundary temperature average value T h And the average evaporation value q m , determine the thermal conductivity.

[0109] It is worth mentioning that when implementing a series of tests, such as the winding method, thickness, material selection, etc. of the product's thermal insulation material layer 7, multiple consecutive tests can be carried out based on the above-mentioned testing device combined with the above-mentioned thermal conductivity conversion formula to control the winding method, thickness, material selection and other parameters of the product's thermal insulation material layer 7 respectively, so as to obtain a more reliable thermal insulation solution.

[0110] Generally speaking, the shapes, specifications, material selection, etc. of the inner cylinder 21 and the outer cylinder 11 can be implemented with reference to the specifications and shapes of actual products to further improve the reliability of the test results.

[0111] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0112] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0113] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0114] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0115] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0117] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0118] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A thermal conductivity test device for multi-layer insulation materials of cryogenic storage and transportation equipment, characterized in that: include: The outer tank is provided with a vacuum extraction interface; An inner tank is detachably arranged in the outer tank, and a heat insulation material winding area is arranged on the outer side wall of the inner tank for arranging a heat insulation material layer; a refrigerant liquid storage assembly connected to the inner tank for filling the contents with liquid gas; an evaporation amount measuring instrument, connected to the inner tank, for measuring the evaporation amount of the liquid gas in the inner tank; The temperature detection component is arranged in the outer tank to measure the inner and outer temperatures of the thermal insulation material layer.

2. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 1, characterized in that: The refrigerant liquid storage component comprises: Fluid storage tank; An infusion pipeline has one end connected to the liquid storage tank and the other end arranged at the lower part of the inner cavity of the inner tank.

3. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 2, characterized in that: The evaporation amount measuring instrument is connected to the inner tank through an evaporation pipeline, and the evaporation pipeline is communicated with the top of the content.

4. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 1, characterized in that: The liquid gas includes liquid oxygen, liquid nitrogen, liquid argon or carbon dioxide.

5. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 1, characterized in that: The temperature detection component comprises: A first temperature sensor is attached to the inner side of the thermal insulation material layer; The second temperature sensor is attached to the outer side of the thermal insulation material layer.

6. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 1, characterized in that: The outer tank comprises: a bottom sealing seat, an outer cylinder and a top sealing cover; The bottom sealing seat is connected to the lower port of the outer cylinder, and the top sealing cover is detachably connected to the upper port of the outer cylinder to form a closed test cavity; The inner tank is arranged in the test cavity.

7. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 1, characterized in that: The inner tank comprises: a lower insulation seat, an inner cylinder and an upper insulation seat; The lower insulation seat is arranged on the bottom sealing seat, and the lower insulation seat is connected to the lower port of the inner cylinder; The upper insulation seat is connected to the upper port of the inner cylinder; Wherein, the outer peripheral surface of the inner cylinder is set as the insulation material winding area.

8. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to claim 1, characterized in that: The testing device also includes a vacuum pumping unit, which is connected to the vacuum pumping interface.

9. The thermal conductivity testing device for multi-layer insulation materials of cryogenic storage and transportation equipment according to any one of claims 1 to 8, characterized in that: The testing device also includes a field control host, which is connected to the refrigerant liquid storage component, the evaporation amount measuring instrument and the temperature detection component respectively.

10. A method for testing the thermal conductivity of multilayer insulation materials for cryogenic storage and transportation equipment, characterized in that: Implementing a testing step based on the testing device according to claim 1; The testing steps include: According to the set winding method and thickness, multiple layers of thermal insulation material are wound in the thermal insulation material winding area, and the temperature sensing element of the temperature detection assembly is arranged inside the multiple layers of thermal insulation material; Installing an inner tank wrapped with multiple layers of thermal insulation material into the outer tank; The area between the outer tank and the inner tank is evacuated to a vacuum with a vacuum degree higher than 1×10 -2 Pa; Filling the inner tank with a set amount of liquid gas; After the system is stable, the evaporation amount of the liquid gas within a set time is measured using the evaporation amount measuring instrument, and the inner boundary temperature and the outer boundary temperature of the thermal insulation material layer within the set time are measured using the temperature detection component; The thermal conductivity of the multi-layer insulation material is obtained based on the evaporation amount of the liquid gas, the inner boundary temperature and the outer boundary temperature.

Images