Measuring device for measuring the thermal conductivity or the contact thermal resistance

Abstract

The application relates to a measuring device for measuring thermal conductivity or contact thermal resistance. The measuring device comprises a mounting base, a driving mechanism, a hot-end pressing mechanism, a cold-end pressing mechanism and a controller. The cold-end pressing mechanism comprises a cold-end heat flow meter, a cold-end temperature control assembly and a cold-end pressing head in heat conduction connection with the cold-end temperature control assembly. The hot-end pressing mechanism comprises a hot-end heat flow meter, a hot-end temperature control assembly and a hot-end pressing head in heat conduction connection with the hot-end temperature control assembly. The driving mechanism is in power transmission connection with at least one of the cold-end pressing mechanism and the hot-end pressing mechanism, so as to drive the cold-end pressing head and the hot-end pressing head to move relatively to contact a component to be measured, so that the component to be measured conducts heat between the cold-end pressing head and the hot-end pressing head. The controller is used for calibrating a heat flow conversion value converted from a temperature detected by the cold-end temperature control assembly and the hot-end temperature control assembly to a heat flow actual measurement value measured by the heat flow meter.

Description

Technical Field

[0001] This application relates to the field of thermally conductive material testing technology, and in particular to a measuring device for measuring thermal conductivity or contact thermal resistance. Background Technology

[0002] Currently, thermal conductivity and contact thermal resistance are core parameters for evaluating the thermal conductivity and interfacial heat transfer efficiency of materials. In existing technologies, the steady-state heat flow method is the mainstream testing method for thermal conductivity and contact thermal resistance. The working principle of the steady-state heat flow method involves placing the sample between two temperature-controlled plates, controlling the temperature at both ends of the plates, and measuring the heat flow and temperature difference across the sample to determine the sample's thermal conductivity and contact thermal resistance. However, existing technologies rely on a single method for obtaining heat flow parameters, primarily using direct measurement with a heat flow meter. However, heat flow meters are prone to contact thermal resistance due to installation limitations, and long-term use can lead to zero-point drift, resulting in decreased reliability of the measurement data. Furthermore, the adaptability of existing pressing mechanisms is insufficient; they are typically limited to a single-specification indenter, making it difficult to meet the testing needs of samples of different sizes, and the measurable range is limited.

[0003] Therefore, it is necessary to propose a new technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0004] Based on this, this application provides a measuring device for measuring thermal conductivity or contact thermal resistance, which can improve the reliability of measurement results and has better applicability, providing a more reliable solution for the field of thermal conductivity testing.

[0005] Therefore, this application adopts the following technical solution: a measuring device for measuring thermal conductivity or contact thermal resistance, comprising:

[0006] Mounting base;

[0007] A cold end pressing mechanism is provided on the mounting base, and includes a cold end heat flow meter, a cold end temperature control component, and a cold end pressing head that is thermally connected to the cold end temperature control component;

[0008] A hot-end pressing mechanism is provided on the mounting base, and includes a hot-end heat flow meter, a hot-end temperature control component, and a hot-end pressing head that is thermally connected to the hot-end temperature control component.

[0009] A driving mechanism, disposed on the mounting base, is powerably connected to at least one of the cold-end pressing mechanism and the hot-end pressing mechanism to drive the cold-end pressing head and the hot-end pressing head to move relative to each other to contact the component under test, thereby allowing the component under test to conduct heat between the cold-end pressing head and the hot-end pressing head; and

[0010] The controller is used to calibrate the measured heat flow value obtained by the heat flow meter to the heat flow conversion value converted from the temperature detected by the cold end temperature control component and the hot end temperature control component.

[0011] In some embodiments, the cold end crimping mechanism includes various cold end crimping heads of different sizes, which are interchangeably connected to the cold end temperature control component; and / or, the hot end crimping mechanism includes various hot end crimping heads of different sizes, which are interchangeably connected to the hot end temperature control component.

[0012] In some embodiments, the cold-end temperature control assembly includes a cold-end temperature sensor thermally connected to the cold-end pressure head, and the hot-end temperature control assembly includes a hot-end temperature sensor thermally connected to the hot-end pressure head.

[0013] In some embodiments, the cold-end temperature control component includes a flow channel plate for the flow of cooling medium, the flow channel plate having at least two non-communicating flow channels for introducing different cooling media, the cold-end temperature control component including a cold-end heating plate and a cold-end heat insulation plate, the hot-end temperature control component including a hot-end heating plate and a hot-end heat insulation plate, wherein the cold-end heat flow rod, the cold-end heating plate and the cold-end pressure head are detachably connected to each other, and the hot-end heat flow rod, the hot-end heating plate and the hot-end pressure head are detachably connected to each other.

[0014] In some embodiments, the drive mechanism is connected to the hot end crimping mechanism to drive the hot end crimping mechanism to move toward or away from the cold end crimping mechanism, and a flatness adjustment element is provided between the cold end crimping mechanism and the mounting base.

[0015] In some embodiments, a pressure sensor is provided between the drive mechanism and the hot end pressing mechanism.

[0016] In some embodiments, the drive mechanism includes a power source, a lead screw driven to rotate by the power source, and a pressing member driven to translate by the lead screw; wherein the power source includes at least one of a motor and a manual wheel.

[0017] In some embodiments, the measuring device further includes a vacuum sleeve and a vacuum pump for creating a negative pressure environment inside the vacuum sleeve, wherein the cold end pressing mechanism and the hot end pressing mechanism are disposed inside the vacuum sleeve.

[0018] In some embodiments, the drive mechanism guides the hot end pressing mechanism along the length of the guide shaft.

[0019] In some embodiments, the mounting base includes a support base, a plurality of support shafts disposed above the support base, and a plurality of fixed support plates connected to the support shafts. The cold end pressing mechanism and the driving mechanism are connected to the fixed support plates. A plurality of displacement sensors are also disposed on the support shafts.

[0020] The measuring device provided in this application for measuring thermal conductivity or contact thermal resistance includes a driving mechanism that drives a cold-end pressure head and a hot-end pressure head to move relative to each other to contact the component under test, allowing heat conduction between the two pressure heads. The cold-end and hot-end temperature control components each include a temperature sensor for detecting temperature parameters, and the cold-end and hot-end pressing mechanisms each include a heat flow meter for detecting heat flux parameters. During measurement, the temperature parameters are transmitted to a controller to be converted into heat flux parameters for comparison and calibration with the measured values ​​of the heat flow meters. The theoretical heat flux value is calculated from the real-time temperature parameters obtained by the temperature sensors and dynamically calibrated against the measured values ​​of the heat flow meters, thereby improving the reliability of the measurement results. Furthermore, the pressure heads of the measuring device provided in this application can be removed from their corresponding temperature control components to replace them with pressure heads of different specifications, adapting to different components under test and exhibiting better applicability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional assembly diagram of an embodiment of the measuring device of this application.

[0023] Figure 2 This is an exploded perspective view of an embodiment of the measuring device of this application.

[0024] Figure 3 This is a side view of an embodiment of the measuring device of this application.

[0025] Figure 4 This is a cross-sectional view of an embodiment of the measuring device of this application.

[0026] Figure 5 This is a plan view of the flow channel plate in one embodiment of the measuring device of this application.

[0027] The component reference numerals are as follows: 100, Measuring device; 1, Mounting base; 11, Support base; 12, Support shaft; 13, Fixed support plate; 21, Vacuum sleeve; 22, Vacuum pump; 3, Drive mechanism; 31, Motor; 32, Manual wheel; 33, Lead screw; 34, Upper pressure plate; 35, Guide shaft; 36, Lower pressure plate; 4, Hot end pressing mechanism; 41, Hot end pressure head; 42, Hot end heat flow rod; 43, Hot end heat flow... 44. Hot end heating plate; 45. Hot end insulation plate; 5. Cold end pressing mechanism; 51. Cold end pressing head; 52. Cold end heat flow bar; 53. Cold end heat flow meter; 54. Cold end heating plate; 55. Flow channel plate; 551. Inlet 1; 552. Inlet 2; 553. Outlet 1; 554. Outlet 2; 56. Cold end insulation plate; 57. Flatness adjustment component; 58. Piping; 61. Pressure sensor; 62. Displacement sensor. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0030] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly 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 and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figures 1 to 5 As shown, this application provides a measuring device 100 for measuring thermal conductivity or contact thermal resistance, which includes a mounting base 1, a drive mechanism 3, a hot-end pressing mechanism 4, a cold-end pressing mechanism 5, and a controller. The mounting base 1 serves as a supporting body for mounting the drive mechanism 3, the hot-end pressing mechanism 4, and the cold-end pressing mechanism 5. The cold-end pressing mechanism 5 is disposed on the mounting base 1 and includes a cold-end heat flow meter 53, a cold-end temperature control component, and a cold-end pressure head 51 thermally connected to the cold-end temperature control component. The hot-end pressing mechanism 4 is disposed on the mounting base 1 and includes a hot-end heat flow meter 43, a hot-end temperature control component, and a hot-end pressure head 41 thermally connected to the hot-end temperature control component. A drive mechanism 3 is mounted on the mounting base 1 and is powerably connected to at least one of the cold-end pressing mechanism 5 and the hot-end pressing mechanism 4 to drive the cold-end pressing head 51 and the hot-end pressing head 41 to move relative to each other to contact the component under test, so that the component under test conducts heat between the cold-end pressing head 51 and the hot-end pressing head 41. The cold-end temperature control component and the hot-end temperature control component each include a temperature sensor for detecting temperature parameters. The temperature parameters can be transmitted to a controller to be converted into heat flux parameters for comparison and calibration with the measured values ​​of the heat flux meter. In this embodiment, the controller is used to calibrate the heat flux converted from the temperature detected by the cold-end temperature control component and the hot-end temperature control component using the measured heat flux values ​​obtained by the heat flux meter.

[0034] During operation, the heat flux meter measures the heat flux on its corresponding heat flux element, and the temperature sensor detects the temperature of the corresponding heat flux element. The heat flux on the heat flux element can also be calculated from the temperature value detected by the temperature sensor. The heat flux meter is accurate under low heat flux conditions. Therefore, when the heat flux is low, the heat flux measured by the heat flux meter can be used to correct the heat flux obtained from the temperature value, resulting in a correction factor. Under high heat flux conditions, the heat flux meter measurement may be inaccurate. In this case, the accurate high heat flux data can be obtained by calculating the temperature value detected by the temperature sensor and the correction factor. For the calibration described above, in a specific embodiment, the heat flux value calculated from the temperature value is corrected based on the heat flux meter measurement under low heat flux conditions, and the heat flux value calculated based on the temperature value is used as the current actual heat flux value under high heat flux conditions.

[0035] The measuring device 100 provided in this application for measuring thermal conductivity or contact thermal resistance converts real-time temperature parameters obtained by a temperature sensor into theoretical heat flux values ​​and compares them with the measured values ​​of a heat flux meter for correction and calibration, thereby improving the reliability of the measurement results. In addition, the pressure head of the measuring device 100 provided in this application can be removed from its corresponding temperature control component to replace pressure heads of different specifications, adapting to test parts of different sizes and having better applicability.

[0036] Please see Figures 1 to 4 As shown, in this embodiment, the mounting base 1 includes a support base 11, a plurality of support shafts 12 disposed above the support base 11, and a plurality of fixed support plates 13 connected to the support shafts 12. The cold end pressing mechanism 5 and the drive mechanism 3 are connected to the fixed support plates 13. Specifically, in this embodiment, the support base 11 has a frame structure, which includes a plurality of support columns and a top plate disposed at the top of the support columns. The support shafts 12 extend upward from the top plate. In this embodiment, there are four support shafts 12, which are perpendicular to the top plate of the support base 11. In this embodiment, there are three fixed support plates 13, located at the bottom, top, and middle of the support shafts 12, respectively. The one located at the bottom is used for mounting the cold end pressing mechanism 5, and the ones located at the top and middle are used for mounting the drive mechanism 3 and guiding the drive mechanism 3 to smoothly transmit power. In this embodiment, the hot end pressing mechanism 4 is connected to the drive mechanism 3, and the drive mechanism 3 drives the hot end pressing mechanism 4 to move up and down to move away from or towards the cold end pressing mechanism 5. To monitor the displacement accuracy of the hot-end pressing mechanism 4, several displacement sensors 62 are also provided on the support shaft 12 to monitor and feedback the movement of the hot-end pressing mechanism 4, ensuring the positioning accuracy of the pressing process. In this embodiment, the displacement sensor 62 is a laser displacement sensor; in other embodiments, it may be other types of sensors.

[0037] In this embodiment, the measuring device 100 further includes a vacuum sleeve 21 and a vacuum pump 22 for creating a negative pressure environment within the vacuum sleeve 21. The cold end pressing mechanism 5 and the hot end pressing mechanism 4 are disposed within the vacuum sleeve 21. In this embodiment, the vacuum pump 22 is disposed within the frame structure formed by the support base 11, without occupying additional space. The vacuum sleeve 21 is fitted over the top plate of the support base 11 to enclose the support shaft 12, the fixed support plate 13, the drive mechanism 3, the cold end pressing mechanism 5, and the hot end pressing mechanism 4. A sealed connection is formed between the vacuum sleeve 21 and the support base 11. The vacuum pump 22 communicates with the interior of the vacuum sleeve 21 through a pipe, and the vacuum pump 22 draws air to create a vacuum environment within the vacuum sleeve 21. By providing the vacuum pump 22 and the vacuum sleeve 21, this embodiment eliminates the interference of air convection on heat conduction. In this environment, heat conduction between the component under test and the pressure head is mainly through solid-state heat conduction, and the influence of natural air convection and radiation heat transfer is significantly suppressed, thereby improving the accuracy of the test.

[0038] Please see Figures 2 to 4 As shown, the cold end crimping mechanism 5 includes a cold end crimping head 51, a cold end heat flow meter 53, and a cold end temperature control assembly for controlling the temperature of the cold end crimping head 51. Specifically, in this embodiment, the cold end temperature control assembly includes a cold end heat flow rod 52, a cold end heating plate 54, a flow channel plate 55, and a cold end heat insulation plate 56, and the components are detachably connected to each other.

[0039] The cold end indenter 51 is a heat-conducting component used to directly contact the part under test during measurement. In this embodiment, the cold end crimping mechanism 5 includes cold end indenters 51 of various sizes, which are interchangeably connected to the cold end temperature control component. This configuration accommodates samples of different sizes. The cold end crimping mechanism 5 is equipped with cold end indenters 51 of various sizes, and the cold end indenters 51 are interchangeably connected to the upper end of the cold end heat flux rod 52 through detachable connection methods such as threads, snap-fit, and plug-in.

[0040] The cold-end heat flux rod 52 is made of a high thermal conductivity material, such as a high thermal conductivity copper alloy. In this embodiment, the cold-end heat flux rod 52 has a built-in cold-end temperature sensor; specifically, the cold-end heat flux rod 52 has multiple temperature probes inside, and a cold-end temperature sensor is installed at each temperature probe to collect the temperature data of the cold-end heat flux rod 52 in real time. The temperature data is transmitted to the controller, which calculates the heat flux conversion value based on the temperature of the multiple temperature probes built into the heat flux rod, and compares and calibrates it with the measured value of the cold-end heat flux meter 53 to ensure the reliability of the measurement data. When the controller compares the theoretical heat flux value with the measured value, if the deviation exceeds a preset threshold, the algorithm corrects the zero-point drift or contact thermal resistance of the heat flux meter to ensure the reliability of the measurement data. In some embodiments, the cold-end temperature sensor may not be installed inside the cold-end heat flux rod 52, but may be installed on other components such as the cold-end pressure head 51 included in the cold-end pressing mechanism 5. That is, the cold-end temperature sensor can be thermally connected to the cold-end pressure head 51.

[0041] In this embodiment, the cold-end heat flux meter 53 is disposed between the cold-end heat flux rod 52 and the cold-end heating plate 54, maintaining good thermal conductivity with both. The cold-end heat flux meter 53 directly outputs the measured value of the heat flux parameter by detecting the heat flux density of the cold-end heat flux rod 52. It is understood that in other embodiments, the cold-end heat flux meter 53 can also be disposed in other locations; the key is that it is located on the heat transfer path and can achieve heat flux detection.

[0042] The flow channel plate 55 provides cooling medium for its flow and cooling. The flow channel plate 55, together with the cold-end heating plate 54, works to achieve precise temperature control of the cold-end pressure head 51. Please refer to [further details]. Figure 5 As shown, in this embodiment, the flow channel plate 55 has at least two non-communicating flow channels for introducing different cooling media, enabling a wider temperature range control and facilitating switching between different temperature test modes. Corresponding to the two flow channels are inlet 551 and outlet 553, and inlet 552 and outlet 554, respectively. The inlets and outlets are connected to an external liquid supply device via pipes 58. In use, for example, when testing in the low-temperature range of -55 to 15°C, a cooling medium such as R134A can be introduced into one flow channel; when testing in the normal temperature range of 15 to 180°C, water can be introduced into the other flow channel. By adjusting the flow rate and temperature of the two cooling media, precise temperature control of the cold end pressure head 51 can be achieved. The upper surface of the flow channel plate 55 is tightly bonded to the lower surface of the cold end heating plate 54 using thermally conductive silicone grease, while the lower surface is fixed to the cold end insulation plate 56 via bolts or other detachable connection methods. The cold end insulation plate 56 is made of insulation material with low thermal conductivity, which effectively blocks the heat conduction between the flow channel plate 55 and the mounting base 1, reducing heat loss and external thermal interference.

[0043] In this embodiment, a flatness adjustment component 57 is provided between the cold end crimping mechanism 5 and the mounting base 1. In this embodiment, the flatness adjustment component 57 consists of four rectangularly distributed adjusting bolts. By rotating these bolts, the levelness of the cold end crimping mechanism 5 can be adjusted to ensure that the contact surfaces of the cold end crimping head 51 and the hot end crimping head 41 are completely parallel, thus avoiding uneven heat conduction due to flatness errors.

[0044] Please continue reading. Figures 2 to 4 As shown, the hot end pressing mechanism 4 is arranged symmetrically with the cold end pressing mechanism 5. The hot end pressing mechanism 4 includes a hot end pressing head 41, a hot end heat flow meter 43, and a hot end temperature control assembly. The hot end temperature control assembly specifically includes a hot end heat flow rod 42, a hot end heating plate 44, and a hot end heat insulation plate 45, etc., and the components are detachably connected to each other.

[0045] The hot end pressing mechanism 4 includes hot end pressing heads 41 of various sizes and specifications, which can be interchangeably connected to the hot end temperature control component. That is, in this embodiment, the hot end pressing heads 41 are configured with various specifications, and the hot end pressing heads 41 are detachably connected to the lower end of the hot end heat flow rod 42 through detachable connection methods such as threads, snap-fit, and plug-in.

[0046] The hot-end heat flux rod 42 is made of a high thermal conductivity material, such as a high thermal conductivity copper alloy. The hot-end heat flux rod 42 has a built-in temperature sensor; specifically, it has multiple temperature probes, each equipped with a hot-end temperature sensor, for real-time acquisition of temperature data. The heat flux conversion values ​​from the multiple temperature probes within the hot-end heat flux rod 42 are compared and calibrated with the measured values ​​from the hot-end heat flux meter 43 to ensure the reliability of the measurement data. When the controller compares the theoretical heat flux value with the measured value, if the deviation exceeds a preset threshold, an algorithm corrects for the zero-point drift or contact thermal resistance of the heat flux meter to ensure the reliability of the measurement data. In some embodiments, the hot-end temperature sensor may not be located within the hot-end heat flux rod 42; it may be located on other components, such as the hot-end pressure head 41, included in the hot-end pressing mechanism 4. That is, the hot-end temperature sensor can be thermally connected to the hot-end pressure head 41.

[0047] In this embodiment, the hot-end heat flux meter 43 is disposed between the hot-end heat flux rod 42 and the hot-end heating plate 44, maintaining good thermal conductivity with both. The hot-end heat flux meter 43 directly outputs the measured value of the heat flux parameter by detecting the heat flux density of the hot-end heat flux rod 42. It is understood that in other embodiments, the hot-end heat flux meter 43 can also be disposed in other locations; the key is that it is located on the heat flux transfer path and can achieve heat flux detection. This embodiment improves measurement accuracy by placing heat flux meters at both the cold and hot ends; of course, in some other embodiments, the heat flux meter can be disposed only on either the cold-end pressing mechanism 5 or the hot-end pressing mechanism 4.

[0048] In one embodiment, the hot-end heating plate 44 has built-in heating resistance wires, heating elements, and other heating components, and is equipped with a temperature controller. The heating power can be adjusted through a PID algorithm to stabilize the hot-end pressure head 41 at the set temperature. The hot-end insulation plate 45 is made of a low thermal conductivity insulation material to block heat conduction between the hot-end heating plate 44 and the drive mechanism 3.

[0049] In this embodiment, the drive mechanism 3 is connected to the hot-end pressing mechanism 4 to drive the hot-end pressing mechanism 4 to move closer to or further away from the cold-end pressing mechanism 5. A pressure sensor 61 is provided between the drive mechanism 3 and the hot-end pressing mechanism 4. In some other embodiments, the drive mechanism 3 may also be connected to the cold-end pressing mechanism 5. In this embodiment, the drive mechanism 3 includes a power source, a lead screw 33 driven to rotate by the power source, and a pressing member that is driven to translate by the lead screw 33; wherein, the power source includes at least one of a motor 31 and a manual wheel 32.

[0050] Specifically, in this embodiment, the drive mechanism 3 is mounted on a fixed support plate 13 located at the top of the support shaft 12. Its power output end is connected to the hot end pressing mechanism 4, which drives the hot end pressing mechanism 4 to move towards the cold end pressing mechanism 5, thereby achieving contact and pressure application of the pressing head. The drive mechanism 3 specifically includes a motor 31, a manual wheel 32, a lead screw 33, an upper pressure plate 34, a guide shaft 35, and a lower pressure plate 36.

[0051] In this embodiment, the power source adopts a parallel drive mode of motor 31 and manual wheel 32. Motor 31 is connected to the upper end of lead screw 33 via a synchronous belt, while manual wheel 32 is directly mounted on the upper end of lead screw 33. Motor 31 and manual wheel 32 can work independently, satisfying the dual requirements of electric drive and manual drive.

[0052] In this embodiment, the upper pressure plate 34, guide shaft 35, and lower pressure plate 36 are fixed together to form a pressing component. The upper pressure plate 34 is located above the fixed support plate 13 in the middle, and the lower pressure plate 36 is located below the fixed support plate 13. The guide shaft 35 passes through the fixed support plate 13. The lead screw 33 passes through the upper pressure plate 34 and is connected to the threaded sleeve embedded in the upper pressure plate 34. The drive mechanism 3 guides the hot end pressing mechanism 4 along the length direction (i.e., its axial direction) of the guide shaft 35. During operation, the motor 31 or the manual wheel 32 drives the lead screw 33 to rotate, and the lead screw 33 drives the upper pressure plate 34 to move up or down. The upper pressure plate 34 drives the lower pressure plate 36 to move up and down through the guide shaft 35, thereby driving the hot end pressing mechanism 4 connected to the lower pressure plate 36 to move up and down. A pressure sensor 61 is installed between the lower pressure plate 36 and the hot end pressing mechanism 4. This pressure sensor 61 monitors the contact pressure during the pressing process in real time and feeds the signal back to the controller. The controller achieves closed-loop control of the pressure by adjusting the output torque of the motor 31 or the rotation of the manual wheel 32, ensuring that the pressing pressure remains stable within the set range.

[0053] In use, when measuring the thermal conductivity of a single specimen, the specimen is placed on the cold end pressure head 51. The hot end pressing mechanism 4 is moved downward by the driving mechanism 3 so that the hot end pressure head 41 matches and presses the single specimen against the cold end pressure head 51. A reliable heat flow value can be obtained by using the measured heat flow value and the temperature-based heat flow conversion value. The thermal conductivity of the single specimen can then be calculated. When measuring the contact thermal resistance of two specimens, the two specimens are stacked on the cold end pressure head 51. The hot end pressing mechanism 4 is moved downward by the driving mechanism 3 so that the hot end pressure head 41 matches and presses the two specimens against the cold end pressure head 51. A reliable heat flow value can be obtained by using the measured heat flow value and the temperature-based heat flow conversion value. The contact thermal resistance of the two specimens can then be calculated.

[0054] As can be seen from the above description of the specific embodiments, the measuring device 100 for measuring thermal conductivity or contact thermal resistance provided in this application includes a temperature sensor for detecting temperature parameters and a heat flow meter for detecting heat flow parameters, respectively, in the cold end temperature control component and the hot end temperature control component. During measurement, the temperature parameters are transmitted to the controller to be converted into heat flow parameters for comparison and calibration with the measured values ​​of the heat flow meter. This effectively solves the problem of poor reliability of measurement results caused by the single reliance on the heat flow meter for heat flow parameters in traditional equipment, especially the problem of large deviation in the measurement results of the heat flow meter when the heat flow is high. At the same time, the pressure head in this application embodiment adopts a design with multiple specifications and is replaceable, which expands the adaptability of the measuring device 100 to samples of different sizes. The cold end temperature control component adopts a dual-inlet and dual-outlet flow channel design, which greatly improves the temperature control range and significantly enhances the range coverage capability of the measuring device 100.

[0055] 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.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A measuring device for measuring thermal conductivity or contact thermal resistance, characterized in that, include: Mounting base (1); The cold end crimping mechanism (5) is provided on the mounting base (1) and includes a cold end heat flow meter (53), a cold end temperature control component and a cold end crimping head (51) that is thermally connected to the cold end temperature control component. A hot end pressing mechanism (4) is provided on the mounting base (1), and includes a hot end heat flow meter (43), a hot end temperature control component, and a hot end pressing head (41) that is thermally connected to the hot end temperature control component. A drive mechanism (3) is disposed on the mounting base (1). The drive mechanism (3) is power-transmittedly connected to at least one of the cold end pressing mechanism (5) and the hot end pressing mechanism (4) to drive the cold end pressing head (51) and the hot end pressing head (41) to move relative to each other to contact the component under test, so that the component under test conducts heat between the cold end pressing head (51) and the hot end pressing head (41). as well as The controller is used to calibrate the measured heat flow value obtained by the heat flow meter to the heat flow conversion value converted from the temperature detected by the cold end temperature control component and the hot end temperature control component.

2. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 1, characterized in that, The cold end crimping mechanism (5) includes cold end crimping heads (51) of different sizes, which are interchangeably connected to the cold end temperature control component; and / or, the hot end crimping mechanism (4) includes hot end crimping heads (41) of different sizes, which are interchangeably connected to the hot end temperature control component.

3. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 1 or 2, characterized in that, The cold end temperature control component includes a cold end temperature sensor that is thermally connected to the cold end pressure head (51), and the hot end temperature control component includes a hot end temperature sensor that is thermally connected to the hot end pressure head (41).

4. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 3, characterized in that, The cold end temperature control component includes a flow channel plate (55) for the flow of cooling medium. The flow channel plate (55) has at least two non-communicating flow channels for introducing different cooling media. The cold end temperature control component includes a cold end heat flow rod (52), a cold end heating plate (54), and a cold end heat insulation plate (56). The hot end temperature control component includes a hot end heat flow rod (42), a hot end heating plate (44), and a hot end heat insulation plate (45). The cold end heat flow rod (52), the cold end heating plate (54), and the cold end pressure head (51) are detachably connected to each other. The hot end heat flow rod (42), the hot end heating plate (44), and the hot end pressure head (41) are detachably connected to each other.

5. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 1 or 2, characterized in that, The driving mechanism (3) is connected to the hot end pressing mechanism (4) to drive the hot end pressing mechanism (4) to move closer to or further away from the cold end pressing mechanism (5). A flatness adjustment component (57) is provided between the cold end pressing mechanism (5) and the mounting base (1).

6. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 5, characterized in that, A pressure sensor (61) is provided between the drive mechanism (3) and the hot end pressing mechanism (4).

7. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 5, characterized in that, The drive mechanism (3) includes a power source, a lead screw (33) driven to rotate by the power source, and a pressing member driven to translate by the lead screw (33); wherein the power source includes at least one of a motor (31) and a manual wheel (32).

8. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 1, characterized in that, The measuring device (100) further includes a vacuum sleeve (21) and a vacuum pump (22) for drawing the vacuum sleeve (21) into a negative pressure environment, wherein the cold end pressing mechanism (5) and the hot end pressing mechanism (4) are disposed inside the vacuum sleeve (21).

9. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 1, characterized in that, The drive mechanism (3) guides the hot end pressing mechanism (4) along the length of the guide shaft (35).

10. The measuring device for measuring thermal conductivity or contact thermal resistance as described in claim 1 or 9, characterized in that, The mounting base (1) includes a support base (11), a plurality of support shafts (12) disposed above the support base (11), and a plurality of fixed support plates (13) connected to the support shafts (12). The cold end pressing mechanism (5) and the driving mechanism (3) are connected to the fixed support plates (13). A plurality of displacement sensors (62) are also disposed on the support shafts (12).

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