Thermal property parameter measuring device

Abstract

The utility model relates to a kind of thermophysical property parameter measuring devices, comprising: hot end crimping mechanism, including the first heat flow spare with the first thermal conductivity, first heat flow meter and at least two first temperature sensors spaced apart along the first direction are all installed on the first heat flow spare, and first heat flow meter is used to measure the heat flow of first heat flow spare;Cold end crimping mechanism, including the second heat flow spare with the second thermal conductivity, second heat flow meter and at least two second temperature sensors spaced apart along the first direction are all installed on the second heat flow spare, and second heat flow meter is used to measure the heat flow of second heat flow spare;Wherein, first heat flow spare and second heat flow spare are oppositely arranged in the first direction and form test space for installing test piece between them, and hot end crimping mechanism and cold end crimping mechanism can generate relative motion along the first direction so that first heat flow spare and second heat flow spare cooperate and crimp test piece located in test space.

Description

Technical Field

[0001] This utility model relates to the field of thermal property parameter measurement technology, and in particular to a thermal property parameter measurement device. Background Technology

[0002] Thermal resistance and thermal conductivity are the most critical physical parameters of materials in heat transfer design. Without accurate thermal resistance and thermal conductivity data, large deviations will occur between the designed and actual values ​​of the heat transfer structure, leading to abnormal temperature control in the equipment. Thermal resistance includes contact thermal resistance and material thermal resistance; the sum of contact thermal resistance and material thermal resistance is the total thermal resistance. Once the total thermal resistance and material thermal resistance are obtained, the contact thermal resistance can be calculated, and the material thermal conductivity can be obtained from the material thermal resistance and other material parameters.

[0003] The principle of thermal resistance measurement is based on a modified form of Fourier's law of heat transfer, R = ΔT / Q, where R is the thermal resistance, ΔT is the temperature difference between two points, and Q is the heat flow through the two points. Theoretically, the larger the temperature difference and the greater the heat flow between the two points, and the more accurate the heat flow measurement, the more accurate the thermal resistance measurement. Traditional techniques suffer from problems such as high accuracy in heat flow measurement but a small measurement range, or a large measurement range but low accuracy. These limitations fail to meet the demand for high-precision, wide-range heat flow measurement, and consequently, the requirement for high-precision thermal resistance testing. Utility Model Content

[0004] Therefore, it is necessary to provide a thermophysical parameter measuring device that can improve the above-mentioned problems.

[0005] A thermophysical parameter measuring device, comprising:

[0006] The hot end pressing mechanism includes a first heat flow element having a first thermal conductivity, a first heat flow meter mounted on the first heat flow element, and at least two first temperature sensors spaced apart along a first direction. The first heat flow meter is used to measure the heat flow of the first heat flow element.

[0007] The cold end pressing mechanism includes a second heat flow element having a second thermal conductivity, a second heat flow meter mounted on the second heat flow element, and at least two second temperature sensors spaced apart along the first direction. The second heat flow meter is used to measure the heat flow of the second heat flow element.

[0008] The first hot flow element and the second hot flow element are arranged opposite each other in the first direction and form a test space for mounting the specimen. The hot end pressing mechanism and the cold end pressing mechanism are capable of relative movement along the first direction so that the first hot flow element and the second hot flow element cooperate to press the specimen located in the test space.

[0009] The aforementioned thermophysical parameter measuring device is equipped with a heat flow meter and a temperature sensor on the heat flow components of both the hot-end pressing mechanism and the cold-end pressing mechanism. The heat flow meter can measure the heat flow on its corresponding heat flow component, and the temperature sensor can detect the temperature of the corresponding heat flow component. The heat flow on the heat flow component can also be obtained from the temperature value detected by the temperature sensor. Since the heat flow meter can measure small heat flows accurately, when the heat flow is small, the heat flow measured by the heat flow meter can be used to correct the heat flow obtained from the temperature value to obtain a correction coefficient. Accurate large heat flow data can be obtained from the temperature value and the correction coefficient. It can be seen that the thermophysical parameter measuring device provided in this application embodiment has a large range of heat flow measurement and high measurement accuracy, which can meet the requirements of high-precision and large-range heat flow measurement. Since the measurement accuracy of thermophysical parameters is related to the heat flow range and the heat flow accuracy, when high-precision and large-range heat flow measurement is possible, the high-precision measurement requirements of thermophysical parameters are guaranteed.

[0010] In one embodiment, the thermophysical parameter measuring device further includes a heat source for heating the first heat flow element;

[0011] and / or

[0012] The thermophysical parameter measuring device further includes a cold source, which is used to cool the second heat flow element.

[0013] In one embodiment, the heat source includes a heating element, and the thermophysical parameter measuring device further includes a heat-insulating pressing assembly, which presses the heating element onto the end face of the first heat flow element away from the second heat flow element along the first direction.

[0014] and / or

[0015] The cold source also includes a flow channel structure, a refrigerant compressor, and a heating element. The refrigerant compressor is connected to the flow channel of the flow channel structure. The second heat transfer element and the heating element are both installed on the flow channel structure. The refrigerant compressor and the heating element control the temperature of the flow channel structure through a combination of heat and cold.

[0016] In one embodiment, the first heat flow element includes a first body and a first pressure head, the first pressure head being disposed at one end of the first body along the first direction to form the test space between it and the second heat flow element; the first heat flow meter is disposed on the first body, at least two first temperature sensors are disposed on the first body and located on both sides of the first heat flow meter, and at least one first temperature sensor is disposed on the first pressure head;

[0017] and / or

[0018] The second heat flow meter includes a second body and a second pressure head. The second pressure head is disposed at one end of the second body along the first direction to form the test space between it and the first heat flow element. The second heat flow meter is disposed on the second body, at least two second temperature sensors are disposed on the second body and located on both sides of the second heat flow meter, and at least one second temperature sensor is disposed on the second pressure head.

[0019] In one embodiment, a first temperature sensor is mounted on the end of the first heat transfer element used for pressing the specimen;

[0020] and / or

[0021] The second temperature sensor is installed at the end of the second heat flow element used for pressing the specimen.

[0022] In one embodiment, the thermophysical parameter measuring device further includes a first driving mechanism, one of the hot end pressing mechanism and the cold end pressing mechanism being connected to the first driving mechanism. The first driving mechanism is used to drive the hot end pressing mechanism and the cold end pressing mechanism to generate relative movement along the first direction to press the specimen located in the test space.

[0023] In one embodiment, the thermophysical parameter measuring device further includes a first connector, a second connector, and an elastic member. The first connector is connected to one of the hot end pressing mechanism and the cold end pressing mechanism. The second connector connects the first connector and the first driving mechanism. The elastic member is disposed along the first direction between the second connector and the hot end pressing mechanism or the cold end pressing mechanism.

[0024] The first driving mechanism can drive the first connecting member, the second connecting member, the elastic member, and the pressing mechanism connected to the first connecting member to move along the first direction; the second connecting member is movably connected to the first connecting member along the first direction, and when the pressing mechanism connected to the first connecting member contacts the test piece, the second connecting member moves relative to the first connecting member to compress the elastic member.

[0025] In one embodiment, the thermophysical parameter measuring device further includes a first sealing sleeve and a second sealing sleeve, wherein the first sealing sleeve is fitted outside the hot end pressing mechanism and the second sealing sleeve is fitted outside the cold end pressing mechanism;

[0026] The thermophysical parameter measuring device further includes a movable sleeve and a second driving mechanism. The movable sleeve is connected to the second driving mechanism, which drives the movable sleeve to move along the first direction to be fitted over the first sealing sleeve, the second sealing sleeve, and the specimen.

[0027] In one embodiment, the thermophysical parameter measuring device further includes a vacuum generator, which is in communication with the inner cavity of one of the first sealing sleeve and the second sealing sleeve.

[0028] In one embodiment, the thermophysical parameter measuring device further includes a mounting structure and an adjustment mechanism. The adjustment mechanism is mounted on the mounting structure. One of the hot end pressing mechanism and the cold end pressing mechanism is connected to the adjustment mechanism. The adjustment mechanism is used to adjust the position of the pressing mechanism connected to it relative to the mounting structure, so that the pressing surfaces of the two pressing mechanisms remain parallel.

[0029] In one embodiment, the adjustment mechanism includes a plurality of adjustment members that are all disposed on the mounting structure along the first direction, and the plurality of adjustment members cooperate with each other to adjust the pressing surfaces of the two pressing mechanisms to be parallel.

[0030] In one embodiment, the thermophysical parameter measuring device further includes a pressure sensor connected to one of the hot end pressing mechanism and the cold end pressing mechanism to detect the pressure when the two press the specimen together.

[0031] and / or

[0032] The thermophysical parameter measuring device further includes a displacement sensor, which is used to detect the size of the test piece along the first direction. Attached Figure Description

[0033] Figure 1 A front view of a thermophysical parameter measuring device provided in an embodiment of this application;

[0034] Figure 2 for Figure 1 A structural diagram of a partial structure of the thermophysical property parameter measuring device shown in the figure;

[0035] Figure 3 for Figure 1 A front view of a partial structure of the thermophysical parameter measuring device shown in the figure;

[0036] Figure 4 for Figure 1 A cross-sectional view of a partial structure of the thermophysical parameter measuring device shown in the figure;

[0037] Figure 5 for Figure 1 The diagram shows a portion of the thermophysical property parameter measuring device including a hot-end pressing mechanism.

[0038] Figure 6 for Figure 5 A cross-sectional view of the structure shown;

[0039] Figure 7 for Figure 1 The diagram shows a portion of the thermophysical parameter measuring device including the cold end pressing mechanism.

[0040] Figure 8 for Figure 7 A cross-sectional view of the structure shown;

[0041] Figure 9 for Figure 1 The diagram shows the structure of the thermophysical parameter measuring device with the movable sleeve fitted outside the first and second sealing sleeves.

[0042] Figure 10 A flowchart illustrating a method for measuring the thermophysical parameters of a specimen provided in an embodiment of this application;

[0043] Figure 11 A schematic diagram of the test principle of a thermophysical parameter measuring device provided in another embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Thermophysical property parameter measuring device; 10. Hot end crimping mechanism; 11. First heat flow element; 111. First main body; 1111. First mounting section; 1112. First connecting section; 1113. First crimping section; 112. First pressure head; 12. First heat flow meter; 13. First temperature sensor; 14. First support member; 20. Cold end crimping mechanism; 21. Second heat flow element; 211. Second main body; 2111. Second mounting section; 2112. Second connecting section; 2113. Second crimping section; 212. Second pressure head; 22. Second heat flow meter; 23. Second temperature sensor; 24. Second support member; 30. Test space; 40. Mounting structure; 50. Heat source; 60. Cold source; 61. Flow channel structure; 62. Addition 70. Heat-insulating pressing assembly; 71. Pressing component; 72. Heat-insulating component; 80. First drive mechanism; 81. First drive component; 82. First transmission assembly; 821. Lead screw; 822. Nut; 90. First connecting component; 91. Guide part; 92. Limiting part; 110. Second connecting component; 120. Elastic component; 130. Pressure sensor; 140. Linear bearing; 150. First sealing sleeve; 160. Second sealing sleeve; 170. Movable sleeve; 180. Second drive mechanism; 181. Second drive component; 182. Second transmission assembly; 1821. Gear; 1822. Rack; 190. Vacuum generator; 200. Adjustment mechanism; 201. Adjustment component; 210. Displacement sensor; 300. Specimen. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] See Figure 1 One embodiment of this application provides a thermophysical parameter measuring device 100 for measuring the thermophysical parameters of a specimen 300. Specifically, the thermophysical parameters of the specimen include total thermal resistance, contact thermal resistance, and thermal conductivity. Thermal resistance is the resistance encountered during heat transfer. When heat flows through the interface between two contacting solids, the interface itself exhibits significant thermal resistance to the heat flow, called contact thermal resistance. Thermal resistance is inversely proportional to the thermal conductivity of the material; the higher the thermal conductivity, the lower the thermal resistance, and vice versa. Heat flow is the amount of heat flowing through a unit area per unit time; it can also be understood as the rate at which thermal energy passes through a unit area.

[0053] See Figure 2 and Figure 3 The thermophysical parameter measuring device 100 includes a hot end pressing mechanism 10 and a cold end pressing mechanism 20, which cooperate with each other to press the specimen 300.

[0054] See Figure 4The hot-end crimping mechanism 10 includes a first heat flow element 11, which has a first thermal conductivity, a known calibrated value. The cold-end crimping mechanism 20 includes a second heat flow element 21, which has a second thermal conductivity, a known calibrated value. The first heat flow element 11 and the second heat flow element 21 are arranged opposite each other in a first direction, forming a test space 30 for mounting the specimen 300. The hot-end crimping mechanism 10 and the cold-end crimping mechanism 20 can move relative to each other in the first direction, causing the first heat flow element 11 and the second heat flow element 21 to cooperate in crimping the specimen 300 located in the test space 300. The temperature of the first heat flow element 11 is higher than the temperature of the second heat flow element 21. When the first heat flow element 11 and the second heat flow element 21 cooperate in crimping the specimen 300, heat will be conducted within the specimen 300.

[0055] After a certain period of time, when the temperatures at both ends of the specimen 300 and the heat flow through the first heat flow element 11 and the second heat flow element 21 tend to stabilize, the thermophysical parameters of the specimen 300 can be measured. Since the total thermal resistance and the thermal resistance (internal thermal resistance of the specimen 300) of the specimen are related to the heat flow and temperature difference, the total thermal resistance and the thermal resistance of the specimen can be obtained by obtaining the temperature difference and the heat flow. Once the total thermal resistance and the thermal resistance of the specimen are obtained, the contact thermal resistance can be obtained.

[0056] The heat flux of the specimen 300 can be obtained from the heat flux of the first heat flux element 11 and the second heat flux element 21. Specifically, the average value of the heat flux of the first heat flux element 11 and the heat flux of the second heat flux element 21 is taken as the heat flux of the specimen 300.

[0057] See Figure 5 and Figure 6 The hot-end pressing mechanism 10 also includes a first heat flow meter 12 and a first temperature sensor 13, both of which are mounted on the first heat flow element 11. Specifically, there are at least two first temperature sensors 13, all of which are sequentially spaced along the first direction on the first heat flow element 11. In this way, multiple first temperature sensors 13 can detect the temperature of the first heat flow element 11 at different positions in the first direction.

[0058] The first heat flow meter 12 can directly measure the heat flow of the first heat flow element 11. The first heat flow meter 12 provides relatively accurate heat flow measurement, but its measurement range is limited. Since the heat flow of the first heat flow element 11 is related to its first thermal conductivity, its cross-sectional area (generally a known value), the temperature difference between two points, and the height difference between two points, the heat flow of the first heat flow element 11 can be calculated based on the first thermal conductivity, the cross-sectional area of ​​the first heat flow element 11, the height difference between the first temperature sensors 13, and the temperature measured by the first temperature sensors 13. Under conditions of low heat flow, the heat flow measured by the first heat flow meter 12 is used to correct the calculated heat flow of the first heat flow element 11 to obtain a correction coefficient. Under conditions of high heat flow, the calculated heat flow of the first heat flow element 11 is multiplied by the correction coefficient to obtain a correction value, which is the accurate value. In this way, high-precision measurement of the large heat flux of the first heat flux component 11 is achieved.

[0059] See Figure 7 and Figure 8 The cold end crimping mechanism 20 also includes a second heat flow meter 22 and a second temperature sensor 23, both of which are mounted on the second heat flow element 21. The second heat flow meter 22 can directly measure the heat flow of the second heat flow element 21, and the second temperature sensor 23 is used to measure the temperature on the second heat flow element 21. Specifically, there are at least two second temperature sensors 23, all of which are sequentially spaced along the first direction on the second heat flow element 21. In this way, multiple second temperature sensors 23 can detect the temperature of the second heat flow element 21 at different positions in the first direction.

[0060] The second heat flux meter 22 provides relatively accurate heat flux measurement, but its measurement range is limited. The heat flux of the second heat flux element 21 is related to its second thermal conductivity, its cross-sectional area (generally a known value, formed by cutting the element perpendicular to the first direction), the temperature difference between two points, and the height difference between two points. Therefore, the heat flux of the second heat flux element 21 can be calculated based on its second thermal conductivity, cross-sectional area, the height difference between the second temperature sensors 23, and the temperature measured by the second temperature sensors 23. Under conditions of low heat flux, the heat flux measured by the second heat flux meter 22 is used to correct the calculated heat flux of the second heat flux element 21, resulting in a correction coefficient. Under conditions of high heat flux, the calculated heat flux of the second heat flux element 21 is multiplied by the correction coefficient to obtain a corrected value, which is the accurate value. This achieves high-precision measurement of high heat flux in the second heat flux element 21.

[0061] It should be noted that the second thermal conductivity of the second heat flux element 21 and the first thermal conductivity of the first heat flux element 11 can be the same or different. Generally, to simplify calculations, the first and second thermal conductivity are set to be the same, that is, the first heat flux element 11 and the second heat flux element 21 are made of the same material (such as copper). Furthermore, to reduce abrupt changes in heat flux and ensure measurement accuracy, the regions of the first heat flux element 11 and the second heat flux element 21 used for measuring heat flux are set to have regular shapes and equal cross-sectional areas.

[0062] After obtaining the heat flow from the first heat flow element 11 and the second heat flow element 21, the heat flow of the specimen 300 can be obtained through the heat flow from the first heat flow element 11 and the second heat flow element 21. The total thermal resistance of the specimen can be obtained through the heat flow of the specimen 300 and the temperature difference between the two ends of the first heat flow element 11 and the second heat flow element 21 that are close to each other. The thermal resistance of the specimen can also be obtained through the heat flow of the specimen 300 and the temperature difference between the two ends of the specimen 300. Finally, the contact thermal resistance of the specimen 300 can be obtained through the total thermal resistance and the thermal resistance of the specimen. Furthermore, the thermal conductivity of the specimen can also be obtained through the thermal resistance of the specimen and the parameters of the specimen 300 (such as the cross-sectional area of ​​the specimen 300 and the height difference between two temperature points measured on the specimen 300).

[0063] The thermal property parameter measuring device 100 provided in this application embodiment is equipped with a heat flow meter and a temperature sensor on the heat flow components of both the hot end pressing mechanism 10 and the cold end pressing mechanism 20. The heat flow meter can measure the heat flow on its corresponding heat flow component, and the temperature sensor can detect the temperature of the corresponding heat flow component. The heat flow on the heat flow component can also be obtained based on the temperature value detected by the temperature sensor. Since the heat flow meter can measure small heat flows accurately, when the heat flow is small, the heat flow measured by the heat flow meter can be used to correct the heat flow obtained from the temperature value to obtain a correction coefficient. Accurate large heat flow data can be obtained through the temperature value and the correction coefficient. It can be seen that the thermal property parameter measuring device 100 provided in this application embodiment has a large range of heat flow measurement and high measurement accuracy, which can meet the requirements of high-precision and large-range heat flow measurement. Since the measurement accuracy of thermal property parameters is related to the heat flow range and the heat flow accuracy, when high-precision and large-range heat flow measurement is possible, the high-precision measurement requirements of thermal property parameters are guaranteed.

[0064] It should also be noted that measuring thermal conductivity requires increasing the heat flux across the specimen 300 to create a temperature difference between its two ends in order to ensure testing accuracy. In this application, the large range of heat flux measurement and high measurement accuracy are precisely what meet the requirements for measuring the thermal conductivity of materials.

[0065] Continue reading Figure 3The thermal property parameter measuring device 100 also includes a mounting structure 40, on which the hot end pressing mechanism 10 and the cold end pressing mechanism 20 are both mounted to improve the integration of the thermal property parameter measuring device 100.

[0066] In some embodiments, see further reference. Figure 6 The first heat flow element 11 includes a first body 111 and a first pressure head 112. The first pressure head 112 is disposed at one end of the first body 111 along a first direction to form a test space 30 between it and the second heat flow element 21. A first heat flow meter 12 is disposed on the first body 111, and at least two first temperature sensors 13 are disposed on the first body 111 and located on both sides of the first heat flow meter 12. At least one first temperature sensor 13 is disposed on the first pressure head 112. In this way, the first pressure head 112 cooperates with the second heat flow element 21 to facilitate the pressing of the test piece 300. Furthermore, the fact that the first heat flow meter 12 is disposed on the first body 111 rather than on the first pressure head 112 ensures the accuracy of heat flow measurement. At the same time, the fact that at least two first temperature sensors 13 are disposed on both sides of the first heat flow meter 12, resulting in a greater distance between the first temperature sensors 13, also ensures the accuracy of heat flow measurement.

[0067] Generally, the heat flow of the first heat flow element 11 is obtained by measuring the temperature value of the first temperature sensor 13 located on the first body 111, and the temperature of the end of the first heat flow element 11 is obtained by measuring the temperature value of the first temperature sensor 13 located on the first pressure head 112, thereby obtaining the temperature difference between the ends of the first heat flow element 11 and the second heat flow element 21 that are close to each other. Specifically, a first temperature sensor 13 is provided on the first pressure head 112, which is located at the end of the first pressure head 112, to measure the temperature of the end of the first heat flow element 11 that is close to the second heat flow element 21, so as to obtain the temperature difference between the ends of the first heat flow element 11 and the second heat flow element 21 that are close to each other, thereby obtaining the total thermal resistance of the specimen.

[0068] Optionally, the first body 111 includes a first mounting section 1111 for mounting the first heat flow meter 12 and the first temperature sensor 13. The first mounting section 1111 has a regular shape so that its cross-sectional area is equal at all points. The first heat flow meter 12 measures the heat flow of the first mounting section 1111, and the first temperature sensor 13 measures the temperature of the first mounting section 1111 to obtain the heat flow of the first heat flow element 11, thereby ensuring test accuracy. In some embodiments, the first pressure head 112 is directly connected to the first mounting section 1111. In other embodiments, the first body 111 also includes a first connecting section 1112 connected to the first mounting section 1111. The first pressure head 112 is connected to the first connecting section 1112, and the cross-sectional area of ​​the first connecting section 1112 may be different from that of the first mounting section 1111.

[0069] The size of the first pressure head 112 is not smaller than the size of the end of the first body 111 connected to it, so that the size of the first pressure head 112 is large enough to press the larger specimen 300.

[0070] Continue reading Figure 8 The second heat flow element 21 includes a second body 211 and a second pressure head 212. The second pressure head 212 is disposed at one end of the second body 211 along a first direction to form a test space 30 between it and the first heat flow element 11. A second heat flow meter 22 is disposed on the second body 211, and at least two second temperature sensors 23 are disposed on the second body 211 and located on both sides of the second heat flow meter 22. At least one second temperature sensor 23 is disposed on the second pressure head 212. In this way, the second pressure head 212 cooperates with the first heat flow element 11 to facilitate the pressing of the test piece 300. Furthermore, the fact that the second heat flow meter 22 is disposed on the second body 211 rather than on the second pressure head 212 ensures the accuracy of heat flow measurement. At the same time, the fact that at least two second temperature sensors 23 are disposed on both sides of the second heat flow element 21, resulting in a greater distance between the second temperature sensors 23, also ensures the accuracy of heat flow measurement.

[0071] Generally, the heat flow of the second heat flow element 21 is obtained by measuring the temperature value of the second temperature sensor 23 located on the second body 211, and the temperature of the end of the second heat flow element 21 is obtained by measuring the temperature value of the second temperature sensor 23 located on the second pressure head 212, thereby obtaining the temperature difference between the ends of the first heat flow element 11 and the second heat flow element 21 that are close to each other. Specifically, a second temperature sensor 23 is provided on the second pressure head 212. The second temperature sensor 23 is located at the end of the second pressure head 212 to measure the temperature of the end of the second heat flow element 21 that is close to the first heat flow element 11, so as to obtain the temperature difference between the ends of the first heat flow element 11 and the second heat flow element 21 that are close to each other, thereby obtaining the total thermal resistance of the specimen 300.

[0072] Optionally, the second body 211 includes a second mounting section 2111 for mounting the second heat flow meter 22 and the second temperature sensor 23. The second mounting section 2111 has a regular shape so that its cross-sectional area is equal at all points. The second heat flow meter 22 measures the heat flow of the second mounting section 2111, and the second temperature sensor 23 measures the temperature of the second mounting section 2111 to obtain the heat flow of the second heat flow element 21, thereby ensuring measurement accuracy. In some embodiments, the second pressure head 212 is directly connected to the second mounting section 2111. In other embodiments, the second body 211 also includes a second connecting section 2112 connected to the second mounting section 2111. The second pressure head 212 is connected to the second connecting section 2112, and the cross-sectional area of ​​the second connecting section 2112 may be different from that of the second mounting section 2111.

[0073] Optionally, the first body 111 and the second body 211 have identical structures, so that the cross-sectional areas of the first mounting section 1111 and the second mounting section 2111 are the same, reducing sudden changes in heat flow and ensuring measurement accuracy. In some specific embodiments, the cross-sectional shape of both the first mounting section 1111 and the second mounting section 2111 is rectangular. Of course, in other embodiments, the cross-sectional shape of the first mounting section 1111 and the second mounting section 2111 is not limited.

[0074] The size of the second pressure head 212 is not smaller than the size of the end of the second body 211 connected to it, so that the size of the second pressure head 212 is large enough to press the larger specimen 300.

[0075] In some embodiments, see further reference. Figure 2 The thermophysical parameter measuring device 100 also includes a heat source 50 for supplying the first heat flow element 11. The thermophysical parameter measuring device 100 also includes a cold source 60 for cooling the second heat flow element 21. By setting the heat source 50 and the cold source 60, the temperature of the first heat flow element 11 is higher, and the temperature of the second heat flow element 21 is lower, creating a temperature difference between them, which facilitates the measurement of the thermophysical parameters of the specimen 300.

[0076] Optionally, the heat source 50 includes a heating element, and the thermophysical parameter measuring device 100 further includes a heat-insulating pressing assembly 70, which presses the heating element onto the end face of the first heat flow element 11 away from the second heat flow element 21 along a first direction. In this way, the heat from the heating element can be transferred from the end of the first heat flow element 11 away from the second heat flow element 21 to the first heat flow element 11, ensuring the temperature difference between the first heat flow element 11 and the second heat flow element 21. Specifically, the first body 111 further includes a first pressing section 1113, which is connected to the end of the first mounting section 1111 away from the second heat flow element 21, and the heat-insulating pressing assembly 70 presses the heating element onto the end face of the first pressing section 1113 away from the first mounting section 1111.

[0077] Optionally, the first main body 111 has an I-shaped structure, with the two ends of the I-shaped structure serving as the first connecting section 1112 and the first crimping section 1113, respectively, and the middle part of the I-shaped structure serving as the first mounting section 1111. Of course, in some other embodiments, the shape of the first heat transfer element 11 is not limited.

[0078] Continue reading Figure 5 and Figure 6 The hot end pressing mechanism 10 also includes a first support member 14, which is located between the two ends of the I-shaped first main body 111 and supports the two ends of the I-shaped first main body 111 through support columns. The support columns have a small area, which reduces the heat conducted to the outside through the first support member 14.

[0079] Continue reading Figure 3 The heat-insulating pressing assembly 70 includes a pressing member 71 and a heat-insulating member 72. The pressing member 71 presses the heating element onto the first heat flow member 11. The heat-insulating member 72 is located at the end of the pressing member 71 away from the first heat flow member 11 to reduce the heat transfer between the heating element and the outside environment. Specifically, the pressing member 71 has a coating and the contact area between the heat-insulating member 72 and the pressing member 71 is small. The heat-insulating member 72 plays a role in heat preservation, reducing the heat conducted from the heating element to the outside environment, allowing more heat to be conducted to the first heat flow member 11, which facilitates temperature control of the first heat flow member 11.

[0080] Continue reading Figure 4 The cold source 60 includes a flow channel structure 61, a refrigerant compressor, and a heating element 62. The flow channel structure 61 is mounted on the mounting structure 40. The refrigerant compressor is connected to the flow channel of the flow channel structure 61. The second hot flow element 21 and the heating element 62 are both mounted on the flow channel structure 61. The refrigerant compressor and the heating element 62 control the temperature of the flow channel structure 61 through a combination of heat and cold. The refrigerant compressor provides refrigerant to the flow channel structure 61, thereby cooling the equipment. By controlling the heating power of the heating element 62, the cold end temperature is controlled.

[0081] Traditional technologies typically use a cold water bath as the cold source 60 for the equipment, with a minimum temperature above 0°C. However, the thermal resistance characteristics of many materials, especially non-metallic materials, change at low temperatures, making it difficult for the cold source 60 in traditional technologies to meet testing requirements. In this application, a high-power refrigerant generator is selected, capable of providing refrigerant as low as -60°C, significantly increasing the temperature difference between the hot and cold ends, greatly expanding the temperature range, and thus increasing the heat flux of the equipment to meet testing requirements.

[0082] Optionally, the heating element 62 is also a sheet-like structure and is sandwiched between the second heat flow element 21 and the flow channel structure 61. Specifically, the second body 211 also includes a second crimping section 2113, which is connected to the end of the second mounting section 2111 away from the first heat flow element 11, and the heating element 62 is sandwiched between the second crimping section 2113 and the flow channel structure 61.

[0083] In some specific embodiments, the second body 211 is also an I-shaped structure, with the two ends of the I-shaped structure serving as the second connecting section 2112 and the second crimping section 2113, respectively, and the middle part of the I-shaped structure serving as the second mounting section 2111. Of course, in other embodiments, the shape of the second body 211 is not limited.

[0084] Continue reading Figure 7 and Figure 8The cold end crimping mechanism 20 also includes a second support member 24, which is located between the two ends of the I-shaped second main body 211 and supports the two ends of the I-shaped second main body 211 through support columns. The support columns have a small area, which reduces the heat conducted to the outside through the second support member 24.

[0085] Continue reading Figure 1 The thermophysical property measuring device 100 also includes a first drive mechanism 80 mounted on the mounting structure 40. One of the hot-end pressing mechanism 10 and the cold-end pressing mechanism 20 is connected to the first drive mechanism 80. The first drive mechanism 80 is used to drive the hot-end pressing mechanism 10 and the cold-end pressing mechanism 20 to generate relative movement along a first direction, so as to press the specimen 300 located in the test space 30. The arrangement of the first drive mechanism 80 enables relative movement between the hot-end pressing mechanism 10 and the cold-end pressing mechanism 20, so as to ensure the pressing effect of the specimen 300 in the test space 30.

[0086] It should be noted that when the first drive mechanism 80 drives the crimping mechanism connected to it to move along the first direction, the structure fixedly connected to the crimping mechanism moves synchronously along the first direction.

[0087] In some specific embodiments, the hot-end pressing mechanism 10 is connected to the first driving mechanism 80, which can drive the hot-end pressing mechanism 10, the heating element mounted on the first hot flow element 11, and the heat-insulating pressing assembly 70 to move synchronously along a first direction to press the specimen 300. In other specific embodiments, the cold-end pressing mechanism 20 is connected to the first driving mechanism 80, which can drive the cold-end pressing mechanism 20, the heating element 62, and the flow channel structure 61 to move synchronously along a first direction to press the specimen 300.

[0088] Continue reading Figure 3 The first drive mechanism 80 includes a first drive element 81 and a first transmission assembly 82. The first drive element 81 is mounted on the mounting structure 40, and the first transmission assembly 82 connects the first drive element 81 to the pressing mechanism. Optionally, the first drive element 81 is a servo motor. The first transmission assembly 82 includes a lead screw 821 and a nut 822. The lead screw 821 is mounted on the mounting structure 40 and extends along a first direction. The nut 822 is connected to the lead screw 821, and the pressing mechanism is connected to the nut 822. When the servo motor is activated, the lead screw 821 rotates, driving the pressing mechanism to move along the first direction via the nut 822. Specifically, the servo motor drives the lead screw 821 to rotate via a pulley.

[0089] Continue reading Figure 1 , Figure 3 and Figure 4The thermophysical parameter measuring device 100 further includes a first connecting member 90, a second connecting member 110, and an elastic member 120. The first connecting member 90 is connected to one of the hot-end pressing mechanism 10 and the cold-end pressing mechanism 20. The second connecting member 110 connects the first connecting member 90 and the first driving mechanism 80. The elastic member 120 is disposed along a first direction between the second connecting member 110 and either the hot-end pressing mechanism 10 or the cold-end pressing mechanism 20. The first driving mechanism 80 can drive the first connecting member 90, the second connecting member 110, the elastic member 120, and the pressing mechanism connected to the first connecting member 90 to move along the first direction. The second connecting member 110 is movably connected to the first connecting member 90 along the first direction. When the pressing mechanism connected to the first connecting member 90 contacts the specimen 300, the second connecting member 110 moves relative to the first connecting member 90 to compress the elastic member 120.

[0090] With the above configuration, after the pressing mechanism connected to the first driving mechanism 80 presses onto the specimen 300, the first driving mechanism 80 can also drive the second connecting member 110 to continue moving, causing the elastic member 120 to compress. The second connecting member 110 continuously provides pressure to the pressing mechanism connected to the first connecting member 90 through the elastic member 120. Once the pressure reaches a preset value, the first driving mechanism 80 stops working. In this way, the pressure on the pressing surfaces of each indenter can be kept constant and controllable during testing, thereby ensuring the tightness of the fit between the specimen 300 and the indenter and ensuring measurement accuracy.

[0091] Further reading Figure 2 The thermophysical parameter measuring device 100 also includes a pressure sensor 130, which is connected to one of the hot-end pressing mechanism 10 and the cold-end pressing mechanism 20 to detect the pressure when the two press the specimen 300 together. Specifically, the pressure sensor 130 can be located between the first connecting member 90 and the pressing mechanism to ensure the sensitivity of the detection.

[0092] By setting up pressure sensor 130, the pressure supplied by the pressure head to the specimen 300 can be detected in real time, and the test pressure can be adjusted according to the test requirements.

[0093] For some specific implementation methods, please refer to [link / reference]. Figure 4The first connecting member 90 includes a guide portion 91 and a limiting portion 92. The two limiting portions 92 are respectively connected to both ends of the guide portion 91. The guide portion 91 passes through the second connecting member 110, and a linear bearing 140 is provided between the two. The elastic member 120 is a compression spring and is sleeved on the outside of the guide portion 91. The limiting portions 92 at both ends limit the compression spring and the second connecting member 110. The pressing mechanism is connected to the limiting portion 92 at one end. Thus, when the first driving mechanism 80 drives the pressing mechanism to press onto the test piece 300, the second connecting member 110 moves relative to the guide portion 91 in a first direction under the guidance of the linear bearing 140, and compresses the compression spring. The compression spring applies pressure to the limiting portion 92 at one end, thereby providing pressure to the pressing mechanism connected to the limiting portion 92.

[0094] In some embodiments, see Figure 1 and Figure 9 The thermophysical parameter measuring device 100 also includes a first sealing sleeve 150 and a second sealing sleeve 160. The first sealing sleeve 150 is fitted outside the hot end pressing mechanism 10, and the second sealing sleeve 160 is fitted outside the cold end pressing mechanism 20, so as to reduce the heat conduction between the hot end pressing mechanism 10 and the cold end pressing mechanism 20 and the outside world.

[0095] Furthermore, the thermophysical parameter measuring device 100 also includes a movable sleeve 170 and a second driving mechanism 180, with the movable sleeve 170 connected to the second driving mechanism 180. When the hot end pressing mechanism 10 and the cold end pressing mechanism 20 cooperate to press the specimen 300, the second driving mechanism 180 drives the movable sleeve 170 to move along the first direction to be fitted over the first sealing sleeve 150, the second sealing sleeve 160, and the specimen 300, thereby ensuring a sealing effect on the specimen 300, reducing heat conduction between the specimen 300 and the outside world, facilitating rapid temperature stabilization of the specimen 300, and reducing the test time.

[0096] In some specific embodiments, the second drive mechanism 180 is connected to the first drive mechanism 80 and moves synchronously with the crimping mechanism connected to the first drive mechanism 80. Generally, the movable sleeve 170 is fitted outside the sealing sleeve corresponding to the crimping mechanism connected to the first drive mechanism 80, which saves space.

[0097] Optionally, the second drive mechanism 180 is mounted on the second connector 110 and moves synchronously with the second connector 110.

[0098] Continue reading Figure 9The second drive mechanism 180 includes a second drive member 181 and a second transmission assembly 182, which connects the first drive member 81 and the movable sleeve 170. Specifically, the second drive member 181 is a DC motor, and the second transmission assembly 182 includes a gear 1821 and a rack 1822 extending along a first direction. When the linear motor is working, it drives the gear 1821 to rotate, and the gear 1821 drives the rack 1822 to move along the first direction, thereby driving the movable sleeve 170 to move along the first direction.

[0099] It should be understood that in some other embodiments, the arrangement of the second drive member 181 and the second transmission assembly 182 is not limited.

[0100] In some embodiments, when the movable sleeve 170 is fitted outside the first sealing sleeve 150 and the second sealing sleeve 160, the inner cavities of the first sealing sleeve 150, the second sealing sleeve 160, and the movable sleeve 170 are all in communication. (Continue reading...) Figure 9 The thermophysical property measuring device 100 also includes a vacuum generator 190, which is connected to the inner cavity of one of the first sealing sleeve 150 and the second sealing sleeve 160, so that the connected sealing sleeve is in a vacuum state. Since the inner cavities of the first sealing sleeve 150, the second sealing sleeve 160, and the movable sleeve 170 are all connected, the other sealing sleeve and the movable sleeve 170 are also in a vacuum state. Specifically, the vacuum generator 190 is a vacuum pump.

[0101] Since heat exchange between the heat exchanger and the test specimen 300 and the external environment is mainly through convection and radiation, evacuating the sealing sleeve using the vacuum generator 190 can prevent convection. Furthermore, a coating can be added to the surfaces of the heat exchanger and the test specimen 300 to reduce radiation. The combination of these two measures minimizes heat loss, facilitates rapid temperature stabilization of the heat exchanger and the test specimen 300, and avoids the need for existing insulation materials to maintain thermal equilibrium with the external environment (which requires a long time), thus reducing testing time.

[0102] Studies have found that the measurement accuracy of the thermophysical parameter measuring device 100 is affected not only by the magnitude of heat flux, insulation effect, heat flux measurement accuracy, and pressure of the pressing surface, but also by the parallelism of the pressing surface.

[0103] Continue reading Figure 1The thermophysical property parameter measuring device 100 also includes an adjustment mechanism 200, which is mounted on the mounting structure 40. One of the hot-end pressing mechanism 10 and the cold-end pressing mechanism 20 is connected to the adjustment mechanism 200. The adjustment mechanism 200 is used to adjust the position of the pressing mechanism connected to it relative to the mounting structure 40, so that the pressing surfaces of the two pressing mechanisms remain parallel. Generally, the adjustment mechanism 200 is connected to the pressing mechanism that is not connected to the first drive mechanism 80.

[0104] The above setup adjusts the parallelism of the pressing surfaces of the two pressing mechanisms (the pressing surfaces are the planes used by the heat flow element to press the specimen 300) by adjusting the adjusting mechanism 200 to ensure that the two pressing surfaces remain horizontal, thereby ensuring the accuracy of the measurement of thermophysical parameters.

[0105] Specifically, the adjustment mechanism 200 includes a plurality of adjustment members 201 extending along a first direction on the mounting structure 40. The plurality of adjustment members 201 cooperate with each other to adjust the parallelism of the pressing surfaces of the two pressing mechanisms. Optionally, the adjustment member 201 is screwed to the pressing mechanism and has an operating part. During adjustment, the operating part is held by hand and the adjustment member 201 is turned to adjust the screw length between the adjustment member 201 and the pressing mechanism, thereby achieving the purpose of adjusting the parallelism of the pressing surfaces.

[0106] In some specific embodiments, the hot-end crimping mechanism 10 is connected to the first driving mechanism 80, and the adjusting mechanism 200 is used to adjust the position of the cold-end crimping mechanism 20 relative to the mounting structure 40. Since the cold-end crimping mechanism 20 is mounted on the flow channel structure 61, and the adjusting mechanism 200 is directly connected to the flow channel structure 61, the cold-end crimping mechanism 20 can be adjusted when the position of the flow channel structure 61 relative to the mounting structure 40 is adjusted.

[0107] Continue reading Figure 1 The thermophysical parameter measuring device 100 also includes a displacement sensor 210, which is used to detect the size of the test specimen 300 along the first direction so as to calculate the thermophysical parameters based on the size of the test specimen 300.

[0108] The thermophysical parameter measuring device 100 also includes a controller, and the aforementioned heat flow meter, temperature sensor, pressure sensor 130, displacement sensor 210, heat source 50, cold source 60, and drive mechanism are all connected to the controller. After the specimen 300 is placed, the controller can control the equipment to automatically complete the processes of pressing, heat preservation, testing, and calculation, which has a high degree of automation and greatly improves work efficiency.

[0109] In a specific embodiment, the working principle of the thermophysical parameter measuring device 100 is as follows:

[0110] During testing, the specimen 300 is placed on the second pressure head 212, and the test begins after the temperature and pressure test conditions are set.

[0111] The first driving member 81 drives the hot end pressing mechanism 10 to move downward through the first transmission assembly 82, and the first pressing head 112 contacts the specimen 300. The first driving member 81 continues to work, and the second connecting member 110 provides pressure to the hot end pressing mechanism 10 through the elastic member 120. After the pressure value measured by the pressure sensor 130 reaches the set value, the first driving member 81 stops working.

[0112] The second driving component 181 starts working, and drives the movable sleeve 170 to move down through the second transmission assembly 182. The movable sleeve 170 moves down to be fitted outside the first sealing sleeve 150 and the second sealing sleeve 160, and the second driving component 181 stops working.

[0113] The displacement sensor 210 measures the dimension of the specimen 300 along the first direction (the dimension of the specimen 300 along the first direction is the height difference between two temperature points on the specimen 300).

[0114] Vacuum generator 190 operates to evacuate the inside of the sealing sleeve.

[0115] The controller sends a control command, and heat source 50 starts heating and cold source 60 starts cooling. After the temperature of the hot and cold ends and the measured heat flow value stabilize, the test results are obtained.

[0116] The first drive unit 81 and the second drive unit 181 are reset, and the test ends.

[0117] See Figure 10 Another embodiment of this application also provides a method for measuring the thermal properties of a specimen using the above-described thermophysical parameter measuring device 100, comprising:

[0118] S110: Obtain the temperature values ​​measured by at least two temperature sensors on each of the first heat flow element 11 and the second heat flow element 21;

[0119] That is, acquiring the temperature values ​​measured by at least two first temperature sensors 13 on the first heat flow element 11, and acquiring the temperature values ​​measured by at least two second temperature sensors 23 on the second heat flow element 21. In some embodiments, acquiring the temperature values ​​measured by two first temperature sensors 13 on the first heat flow element 11, and acquiring the temperature values ​​measured by two second temperature sensors 23 on the second heat flow element 21. In other embodiments, acquiring the temperature values ​​measured by more than two first temperature sensors 13 on the first heat flow element 11, and acquiring the temperature values ​​measured by more than two second temperature sensors 23 on the second heat flow element 21.

[0120] S120: Obtain a first heat flux value based on the thermal conductivity of the heat flux element, the cross-sectional area of ​​the heat flux element, and the corresponding data set of the heat flux element, and calculate the heat flux value based on at least one first heat flux value; each data set includes a first height difference between two temperature sensors and a first temperature value and a second temperature value measured by the two temperature sensors respectively.

[0121] That is, a first heat flux value is obtained based on the first thermal conductivity of the first heat flux element 11, the cross-sectional area of ​​the first heat flux element 11, and the corresponding data set of the first heat flux element 11, and a calculated heat flux value is obtained based on at least one first heat flux value. Each data set includes a first height difference between two first temperature sensors 13 and a first temperature value and a second temperature value measured by the two first temperature sensors 13 respectively. When only the temperature values ​​measured by two first temperature sensors 13 are obtained, the corresponding data set is considered as one set, resulting in one first heat flux value, and the calculated heat flux value is obtained from this first heat flux value. When more than two temperature sensors 13 are obtained, the corresponding data set is considered as multiple sets, resulting in multiple first heat flux values, and the calculated heat flux value is obtained from these multiple first heat flux values.

[0122] The method for obtaining the calculated heat flux value of the second heat flux element 11 is the same as that for the first heat flux element 11.

[0123] The first thermal conductivity of the first heat transfer element 11 and the second thermal conductivity of the second heat transfer element 21 are both known calibration values. The cross-sectional area of ​​the first heat transfer element 11 is the cross-sectional area of ​​a regularly shaped region of the first heat transfer element 11, and the cross-sectional area of ​​the second heat transfer element 21 is the cross-sectional area of ​​a regularly shaped region of the second heat transfer element 21. Specifically, the cross-sectional area of ​​the first heat transfer element 11 is the cross-sectional area of ​​the first mounting section 1111, and the cross-sectional area of ​​the second heat transfer element 21 is the cross-sectional area of ​​the second mounting section 2111. Generally, the cross-sectional areas of the first mounting section 1111 and the second mounting section 2111 are equal and are known values.

[0124] Furthermore, the temperature measured by the first temperature sensor 13 is the temperature on the first mounting section 1111, and the first height difference between the two first temperature sensors 13 is also a known value. The temperature measured by the second temperature sensor 23 is the temperature on the second mounting section 2111, and the first height difference between the two second temperature sensors 23 is also a known value.

[0125] S130: The calculated heat flux value is corrected based on the correction factor to obtain the corrected heat flux value, and the corrected heat flux value is determined as the target heat flux value; the correction factor is the ratio of the measured heat flux value of the heat flux meter on each heat flux element to its corresponding calculated heat flux value under the heat flux correction condition;

[0126] The heat flux correction condition is defined as the condition where the temperature difference between the first heat flux element 11 and the second heat flux element 21 is less than a preset threshold. Under the heat flux correction condition, the heat flux of the first heat flux element 11 and the second heat flux element 21 is relatively small. The heat flux of the first heat flux element 11 can be measured by the first heat flux meter 12, which has a smaller measurement range and higher measurement accuracy, and the heat flux of the second heat flux element 21 can be measured by the second heat flux meter 22, which has a smaller measurement range and higher measurement accuracy.

[0127] Since the first heat flux meter 12 and the second heat flux meter 22 have high accuracy in measuring heat flux, the measured heat flux value of each heat flux element under heat flux correction conditions is the accurate heat flux value of the heat flux element. The ratio of the measured heat flux value to the calculated heat flux value yields a correction factor. This correction factor is then used to correct the calculated heat flux value under high heat flux conditions, resulting in the accurate heat flux value. Because the corrected heat flux value is the accurate heat flux value of the heat flux element, it can be used as the target heat flux value for the heat flux element. Thus, regardless of the magnitude of the heat flux, the target heat flux value is always the accurate heat flux value for the corresponding heat flux element.

[0128] S140: The thermophysical parameters of the specimen 300 located in the test space 30 are obtained according to the target heat flux value of the first heat flux element 11, the target heat flux value of the second heat flux element 21 and the preset rules.

[0129] The specimen thermophysical parameter measurement method provided in this application embodiment allows for the measurement of heat flux on a corresponding heat flux element under heat flux correction conditions to obtain a measured flow value. A temperature sensor detects the temperature of the corresponding heat flux element. A first heat flux value is obtained based on the thermal conductivity of the heat flux element, its cross-sectional area, and a data set of the corresponding heat flux element (each data set includes a first height difference between two temperature sensors and a first and second temperature value measured by the two sensors respectively). A calculated heat flux value is then obtained based on the first heat flux value. A correction coefficient is obtained based on the ratio of the measured heat flux value to the calculated heat flux value under heat flux correction conditions. Based on the correction coefficient, the calculated heat flux value under other conditions (such as high heat flux conditions) is corrected to obtain a corrected heat flux value. This corrected heat flux value is used as the target heat flux value. Finally, the thermophysical parameters of the specimen 300 are obtained based on the target heat flux value of the first heat flux element 11, the target heat flux value of the second heat flux element 21, and preset rules. In this way, the heat flow measurement range of the heat flow component is large and the measurement accuracy is high, which can meet the requirements of high-precision and large-range heat flow measurement. Since the measurement accuracy of thermal property parameters is related to the heat flow range and the heat flow accuracy, when the heat flow can be measured with high precision over a large range, the requirement for high-precision measurement of thermal property parameters is guaranteed.

[0130] Furthermore, the methods for measuring the thermophysical parameters of the specimen also include:

[0131] Q1=λ1*A1*(T1-T2) / L1, T1>T2; Q2=k*Q3;

[0132] Q1 is the first heat flux value, λ1 is the thermal conductivity of the heat flux component, A1 is the cross-sectional area of ​​the heat flux component, T1 is the first temperature value, T2 is the second temperature value, L1 is the first height difference, Q2 is the target heat flux value, Q3 is the calculated heat flux value, and k is the correction coefficient.

[0133] It should be noted that Q2 can also represent the measured heat flux value obtained by the heat flux meter under heat flux correction conditions.

[0134] Among them, see Figure 11 The first temperature value and the second temperature value on the first heat transfer element 11 are denoted as Th1 and Th2, respectively, and the first height difference and the target heat transfer value corresponding to the first heat transfer element 11 are denoted as Lh1 and Qh2, respectively. The first temperature value and the second temperature value on the second heat transfer element 21 are denoted as Tc1 and Tc2, respectively, and the first height difference and the target heat transfer value corresponding to the second heat transfer element 21 are denoted as Lc1 and Qc2, respectively.

[0135] When there is only one first heat flux value, the first heat flux value is used as the calculated heat flux value; when there are multiple first heat flux values, the average of the multiple first heat flux values ​​is used as the calculated heat flux value.

[0136] Once the thermal conductivity λ1 of the heat flow element, the cross-sectional area A1 of the heat flow element, and the first temperature value T1, the second temperature value T2, and the first height difference T1 in the data set are determined, the first heat flow value Q1 can be obtained according to the formula: Q1=λ1*A1*(T1-T2) / L1.

[0137] When only two temperature sensors measure the temperature of the heat flux component, there is one first heat flux value, which is used as the calculated heat flux value. When more than two temperature sensors measure the temperature of the heat flux component, there are multiple first heat flux values, and the average of these multiple first heat flux values ​​is used as the calculated heat flux value. The more accurate the calculated heat flux value obtained from the first heat flux value, the better.

[0138] In some embodiments, the thermal property parameter includes total thermal resistance; S140 includes:

[0139] The average heat flux value is obtained based on the target heat flux value of the first heat flux element 11 and the target heat flux value of the second heat flux element 21;

[0140] Step S130 can obtain the target heat flux value of the first heat flux element 11 and the target heat flux value of the second heat flux element 21. The average heat flux value can be obtained based on the target heat flux values ​​of the two.

[0141] Acquire the third temperature value measured by the first temperature sensor 13 installed on the end of the first heat exchanger 11 for pressing the specimen 300 and the fourth temperature value measured by the second temperature sensor 23 installed on the end of the second heat exchanger 21 for pressing the specimen 300.

[0142] Specifically, the third temperature value measured by the first temperature sensor 13 installed on the first pressure head 112 is obtained, and the fourth temperature value measured by the second temperature sensor 23 installed on the second pressure head 212 is obtained.

[0143] The total thermal resistance of the specimen was obtained based on the average heat flux, the third temperature value, and the fourth temperature value.

[0144] The total thermal resistance of the specimen is related to the average heat flux and the temperature of the ends of the specimen 300 used for pressing. Therefore, the total thermal resistance of the specimen can be obtained based on the average heat flux, the third temperature value, and the fourth temperature value.

[0145] Furthermore, the methods for measuring the thermophysical parameters of the specimen also include:

[0146] Q=(Qh2+Qc2) / 2, R=(Th3-Tc3) / Q;

[0147] Where Q is the average heat flux value, Qh2 is the target heat flux value of the first heat flux element 11, Qc2 is the target heat flux value of the second heat flux element 21, Th3 is the third temperature value, Tc3 is the fourth temperature value, and R is the total thermal resistance of the specimen.

[0148] Once the target heat flux value Qh2 of the first heat flux element 11, the target heat flux value Qc2 of the second heat flux element 21, the third temperature value Th3, and the fourth temperature value Tc3 are determined, the total thermal resistance of the specimen can be obtained according to the formula: Q=(Qh2+Qc2) / 2, R=(Th3-Tc3) / Q.

[0149] In some embodiments, the thermal property parameters also include thermal conductivity and contact thermal resistance; S140 further includes:

[0150] Obtain the fifth temperature value of the specimen 300 at the first position near the first heat exchanger 11 and the sixth temperature value at the second position near the second heat exchanger 21;

[0151] Optionally, a third temperature sensor and a fourth temperature sensor are provided on the specimen 300. The third temperature sensor detects the fifth temperature value at the first position, and the fourth temperature sensor detects the sixth temperature value at the second position.

[0152] The thermal conductivity of the specimen is obtained based on the average heat flux, the fifth temperature value, the sixth temperature value, the second height difference between the first and second positions, and the cross-sectional area of ​​specimen 300.

[0153] Generally, the second height difference between the first and second positions is a known value, the specimen 300 is a regular shape, and the cross-sectional area of ​​the specimen 300 is known.

[0154] The contact thermal resistance of the specimen (300) was obtained based on the total thermal resistance and thermal conductivity of the specimen.

[0155] Since the total thermal resistance of the specimen is known as described above, once the thermal conductivity of the specimen is known, the contact thermal resistance of the specimen at 300° can be obtained from the total thermal resistance and the thermal conductivity of the specimen.

[0156] Specifically, the methods for measuring the thermophysical parameters of specimens also include:

[0157] Q=(Qh2+Qc2) / 2, λ2=L2 / [A2(Th4-Tc4) / Q], Rj=R-L2 / (λ2.A2)

[0158] Where Q is the average heat flux value, Qh2 is the target heat flux value of the first heat flux element 11, Qc2 is the target heat flux value of the second heat flux element 21, λ2 is the thermal conductivity of the specimen, L2 is the second height difference, A2 is the cross-sectional area of ​​the specimen 300, Th4 is the fifth temperature value, Tc4 is the sixth temperature value, R is the total thermal resistance of the specimen, and Rj is the contact thermal resistance of the specimen 300.

[0159] Once the average heat flux Q, the second height difference L2, the cross-sectional area A2 of specimen 300, the fifth temperature Th4, and the sixth temperature Tc4 are determined, the thermal conductivity λ2 of the specimen can be obtained according to the formula λ2=L2 / [A2(Th4-Tc4) / Q].

[0160] Once the thermal conductivity λ2 and the total thermal resistance R of the specimen are known, the contact thermal resistance of the specimen at 300° can be obtained using the formula Rj=R-L2 / (λ2.A2).

[0161] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A thermophysical parameter measuring device, characterized in that, include: The hot end pressing mechanism (10) includes a first heat flow element (11) having a first thermal conductivity, a first heat flow meter (12) mounted on the first heat flow element (11), and at least two first temperature sensors (13) spaced apart along a first direction. The first heat flow meter (12) is used to measure the heat flow of the first heat flow element (11). The cold end pressing mechanism (20) includes a second heat flow element (21) having a second thermal conductivity, a second heat flow meter (22) mounted on the second heat flow element (21), and at least two second temperature sensors (23) spaced apart along the first direction. The second heat flow meter (22) is used to measure the heat flow of the second heat flow element (21). The first heat exchanger (11) and the second heat exchanger (21) are arranged opposite to each other in the first direction and form a test space (30) for mounting the specimen (300). The hot end pressing mechanism (10) and the cold end pressing mechanism (20) can generate relative movement along the first direction so that the first heat exchanger (11) and the second heat exchanger (21) cooperate to press the specimen (300) located in the test space (30).

2. The thermophysical parameter measuring device according to claim 1, characterized in that, The thermophysical parameter measuring device further includes a heat source (50), which is used to heat the first heat flow element (11); and / or The thermophysical parameter measuring device further includes a cold source (60) for cooling the second heat flow element (21).

3. The thermophysical parameter measuring device according to claim 2, characterized in that, The heat source (50) includes a heating element, and the thermophysical parameter measuring device further includes a heat-insulating pressing assembly (70), which presses the heating element onto the end face of the first heat flow element (11) away from the second heat flow element (21) along the first direction; and / or The cold source (60) also includes a flow channel structure (61), a refrigerant engine, and a heating element (62). The refrigerant engine is connected to the flow channel of the flow channel structure (61). The second heat flow element (21) and the heating element (62) are both installed on the flow channel structure (61). The refrigerant engine and the heating element (62) control the temperature of the flow channel structure (61) through a combination of heat and cold.

4. The thermophysical parameter measuring device according to claim 1, characterized in that, The first heat flow element (11) includes a first body (111) and a first pressure head (112). The first pressure head (112) is disposed at one end of the first body (111) along the first direction to form the test space (30) between it and the second heat flow element (21). The first heat flow meter (12) is disposed on the first body (111), and at least two first temperature sensors (13) are disposed on the first body (111) and located on both sides of the first heat flow meter (12). At least one first temperature sensor (13) is disposed on the first pressure head (112). and / or The second heat flow meter (22) includes a second body (211) and a second pressure head (212). The second pressure head (212) is disposed at one end of the second body (211) along the first direction to form the test space (30) between it and the first heat flow element (11). The second heat flow meter (22) is disposed on the second body (211), and at least two second temperature sensors (23) are disposed on the second body (211) and located on both sides of the second heat flow meter (22). At least one second temperature sensor (23) is disposed on the second pressure head (212).

5. The thermophysical parameter measuring device according to claim 1, characterized in that, The first temperature sensor (13) is installed at the end of the first heat transfer element (11) used for pressing the specimen (300); and / or The second temperature sensor (23) is installed on the end of the second heat flow element (21) for pressing the specimen (300).

6. The thermophysical parameter measuring device according to claim 1, characterized in that, The thermophysical parameter measuring device further includes a first driving mechanism (80), one of the hot end pressing mechanism (10) and the cold end pressing mechanism (20) is connected to the first driving mechanism (80), and the first driving mechanism (80) is used to drive the other to generate relative movement along the first direction to press the specimen (300) located in the test space (30).

7. The thermophysical parameter measuring device according to claim 6, characterized in that, The thermophysical parameter measuring device further includes a first connector (90), a second connector (110), and an elastic member (120). The first connector (90) is connected to one of the hot end pressing mechanism (10) and the cold end pressing mechanism (20). The second connector (110) connects the first connector (90) and the first driving mechanism (80). The elastic member (120) is disposed along the first direction between the second connector (110) and the hot end pressing mechanism (10) or the cold end pressing mechanism (20). The first driving mechanism (80) can drive the first connector (90), the second connector (110), the elastic member (120), and the pressing mechanism connected to the first connector (90) to move along the first direction; the second connector (110) is movably connected to the first connector (90) along the first direction, and when the pressing mechanism connected to the first connector (90) contacts the test piece (300), the second connector (110) moves relative to the first connector (90) to compress the elastic member (120).

8. The thermophysical parameter measuring device according to claim 1, characterized in that, The thermophysical parameter measuring device further includes a first sealing sleeve (150) and a second sealing sleeve (160). The first sealing sleeve (150) is sleeved outside the hot end pressing mechanism (10), and the second sealing sleeve (160) is sleeved outside the cold end pressing mechanism (20). The thermophysical parameter measuring device further includes a movable sleeve (170) and a second driving mechanism (180). The movable sleeve (170) is connected to the second driving mechanism (180), which drives the movable sleeve (170) to move along the first direction to be fitted over the first sealing sleeve (150), the second sealing sleeve (160), and the specimen (300).

9. The thermophysical parameter measuring device according to claim 8, characterized in that, The thermophysical parameter measuring device further includes a vacuum generator (190), which is in communication with the inner cavity of one of the first sealing sleeve (150) and the second sealing sleeve (160).

10. The thermophysical parameter measuring device according to claim 1, characterized in that, The thermophysical parameter measuring device further includes an installation structure (40) and an adjustment mechanism (200). The adjustment mechanism (200) is installed on the installation structure (40). One of the hot end pressing mechanism (10) and the cold end pressing mechanism (20) is connected to the adjustment mechanism (200). The adjustment mechanism (200) is used to adjust the position of the pressing mechanism connected to it relative to the installation structure (40) so that the pressing surfaces of the two pressing mechanisms remain parallel.

11. The thermophysical parameter measuring device according to claim 10, characterized in that, The adjustment mechanism (200) includes a plurality of adjustment members (201) that are all disposed on the mounting structure (40) along the first direction. The plurality of adjustment members (201) cooperate with each other to adjust the pressing surfaces of the two pressing mechanisms to be parallel.

12. The thermophysical parameter measuring device according to claim 1, characterized in that, The thermophysical parameter measuring device also includes a pressure sensor (130), which is connected to one of the hot end pressing mechanism (10) and the cold end pressing mechanism (20) to detect the pressure when the two press the specimen (300). and / or The thermophysical parameter measuring device further includes a displacement sensor (210) for detecting the dimension of the test piece (300) along the first direction.

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