Heat conductivity coefficient tester

Abstract

The utility model discloses a heat conductivity coefficient tester and relates to the technical field of measurement. The heat conductivity coefficient tester comprises an installation shell, a heat conduction assembly and a heat flow sensor. The mounting shell is provided with a mounting cavity; the heat conduction assembly comprises a heat conduction block and a heating piece, and the heat conduction block is arranged in the installation cavity and provided with a first cavity for containing the heating piece. The heat-flow sensor is disposed at one end of the heat-conducting block. The heat conduction block is heated through the heating piece, and the temperature sensor controls the temperature of the heat conduction block. The heat conduction block is contacted with the to-be-measured object, and a heat flow value is obtained through the heat flow sensor at the end, so that the heat conductivity coefficient of the to-be-measured object is obtained. The tester is simple in structure and high in measurement speed, and can be applied to rapid measurement of the heat conductivity coefficient of the vacuum insulated panel.

Description

Technical Field

[0001] The utility model generally relates to the technical field of measurement, and more specifically, to a thermal conductivity measuring instrument. Background Art

[0002] The thermal conductivity refers to the amount of heat transferred through an area of 1 square meter in 1 second (s) when the temperature difference between the two surfaces of a 1 m thick material is 1 degree (K, °C) under steady heat transfer conditions. Vacuum insulation panels are made based on the principle of vacuum insulation, achieving heat conduction isolation by maximizing the vacuum degree inside the panel and filling the core layer with insulating materials, thereby achieving the purpose of heat preservation and energy conservation. The thermal conductivity is an important parameter for measuring the quality of vacuum insulation panels. Currently, the main method for measuring the thermal conductivity of vacuum insulation panels is the steady-state method. However, the steady-state method has harsh experimental conditions, a long measurement time (it generally takes one hour for a 10 mm thick vacuum insulation panel to reach a stable heat flux), and high requirements for samples. Moreover, to obtain an accurate heat flux, it is necessary to strictly ensure the adiabatic conditions of the test system, and to ensure the uniformity of the temperature field across the entire heated surface, there are high requirements for the flatness of the sample surface. Therefore, this method can only be used for measuring the thermal conductivity of a small number of vacuum insulation panels in the laboratory and cannot be applied to the online measurement of a large number of vacuum insulation panels.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0004] A series of simplified concepts are introduced in the summary of the utility model, which will be further elaborated in the detailed implementation section. The summary of the utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] The purpose of the present utility model is to overcome at least one defect of the above-mentioned prior art and provide a thermal conductivity measuring instrument.

[0006] To achieve the above utility model purpose, the present utility model adopts the following technical solutions:

[0007] A thermal conductivity measuring instrument, comprising:

[0008] An installation shell having an installation cavity;

[0009] A heat conduction component, including a heat conduction block and a heating element, the heat conduction block is disposed in the installation cavity and is provided with a first chamber for accommodating the heating element; and

[0010] A heat flux sensor disposed at one end of the heat conduction block.

[0011] According to an embodiment of the present invention, the heat conduction component further includes a temperature sensor, and the heat conduction block is provided with a second chamber for accommodating the temperature sensor.

[0012] According to an embodiment of the present invention, a heat insulation layer is provided between the side wall of the heat conduction block and the installation shell.

[0013] According to an embodiment of the present invention, the heat insulation layer is formed by filling a heat insulation material in the gap between the heat conduction block and the side wall of the installation shell, and the heat insulation material is heat insulation cotton or heat insulation foaming material.

[0014] According to an embodiment of the present invention, the installation shell includes a hollow shell and a cover body connected to one end of the shell. The cavity of the shell forms the installation cavity, and the heat flow sensor is embedded in the end of the heat conduction block away from the cover body.

[0015] According to an embodiment of the present invention, the cover body is fixedly connected to the heat conduction block through a fastener.

[0016] According to an embodiment of the present invention, the material of the shell is aluminum.

[0017] According to an embodiment of the present invention, the material of the heat conduction block is copper, aluminum, copper alloy, aluminum alloy or magnesium alloy.

[0018] According to an embodiment of the present invention, it further includes a lifting plate, and the lifting plate is connected to the installation shell through an elastic buffer member.

[0019] According to an embodiment of the present invention, the elastic buffer member includes a connecting column, a limiting block and a spring. The lifting plate is provided with an avoidance hole. One end of the connecting column is connected to the installation shell, and the other end passes through the avoidance hole and is connected to the limiting block. The spring is sleeved on the connecting column and is located between the lifting plate and the installation shell.

[0020] As can be seen from the above technical solutions, the advantages and positive effects of the thermal conductivity measuring instrument of the present invention are as follows:

[0021] The thermal conductivity measuring instrument provided by the present invention is provided with a heat conduction block in the installation shell. The heat conduction block is heated by a heating element, and the temperature sensor controls the temperature of the heat conduction block to realize the control and feedback of heating and temperature. The heat conduction block is in contact with the object to be measured, and the heat flux density is obtained through the heat flow sensor at the end, so as to obtain the thermal conductivity of the object to be measured. The structure of this measuring instrument is simple and easy to use, and it can quickly measure the thermal conductivity of the object to be measured, and is applicable to the on-line measurement of a large number of vacuum insulation panels. Description of the Drawings

[0022] By considering the following detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings, various objectives, features, and advantages of the present utility model will become more apparent. The accompanying drawings are only exemplary diagrams of the present utility model and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar components. Among them:

[0023] Figure 1 is a schematic structural diagram of a thermal conductivity measuring instrument provided in Embodiment 1 of the present disclosure.

[0024] Figure 2 is Figure 1 a sectional structural diagram of the thermal conductivity measuring instrument in

[0025] Figure 3 is a schematic structural diagram of a thermal conductivity measuring instrument provided in Embodiment 2 of the present disclosure.

[0026] Icon: 100 - thermal conductivity measuring instrument; 10 - mounting shell; 101 - mounting cavity; 11 - housing; 12 - cover; 13 - fastener; 20 - heat conduction component; 21 - heat conduction block; 22 - heating element; 14 - heat insulation layer; 201 - first chamber; 202 - second chamber; 23 - temperature sensor; 30 - heat flux sensor; 40 - lifting plate; 50 - elastic buffer; 51 - connecting column; 52 - limiting block; 53 - spring. Detailed implementation manners

[0027] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present utility model will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0028] The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present utility model. However, those skilled in the art will realize that the technical solutions of the present utility model can be practiced without one or more of the specific details, or other methods, components, materials, etc. can be adopted. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present utility model.

[0029] In the following description, numerous specific details are given to provide a more thorough understanding of the present utility model. However, it will be apparent to those skilled in the art that the present utility model may be practiced without one or more of these details. In other instances, to avoid obscuring the present utility model, some well-known technical features are not described.

[0030] Embodiment 1

[0031] Please refer to Figures 1 - 2 , an embodiment of the present disclosure provides a thermal conductivity measuring instrument 100, which includes a mounting shell 10, a heat conduction component 20, and a heat flux sensor 30. The mounting shell 10 is used to provide a mounting space, which has a mounting cavity 101, and the heat conduction component 20 is installed in the mounting cavity 101. The heat conduction component 20 includes a heat conduction block 21, a heating element 22, and a temperature sensor 23, which are used to provide heat and perform temperature control, and the heat flux sensor 30 is used to detect the heat flux density of the object to be measured.

[0032] In an embodiment of the present disclosure, the mounting shell 10 includes a housing 11 and a cover 12. The housing 11 is hollow, and the cavity of the housing 11 forms the mounting cavity 101. The cover 12 is installed at one end of the housing 11, and the heat conduction block 21 is arranged in the mounting cavity 101 of the housing 11. Specifically, the cover 12 is fixed to one end of the housing 11 to close the end of the housing 11. The cover 12 can be fixed to the housing 11 by welding or other means, or the cover 12 and the housing 11 are integrally formed, and the present disclosure does not make specific limitations.

[0033] Further, in an embodiment of the present disclosure, the cover 12 is fixedly connected to the heat conduction block 21 through a fastener 13, so that the heat conduction block 21 is fixed in the mounting cavity 101. The fastener 13 can be a screw or the like, and the cover 12 and the heat conduction block 21 are locked and fixed by screws.

[0034] Further, in an embodiment of the present disclosure, the housing 11 is a hollow cylindrical structure, the heat conduction block 21 is configured as a cylinder, and the length of the heat conduction block 21 is approximately equal to the length of the mounting cavity 101 to ensure that the heat conduction block 21 can contact the object to be measured. The object to be measured can be a vacuum insulation panel, for example.

[0035] There is a gap between the outer peripheral wall of the heat conduction block 21 and the inner wall of the housing 11. The gap is filled with a heat insulating material to form a heat insulating layer 14. The heat insulating material is heat insulating cotton or heat insulating foaming material. The heat insulating cotton can be glass wool, rock wool, ceramic fiber cotton, etc. The heat insulating foaming material can be polyurethane foaming material, polystyrene foaming material, phenolic foaming material, polyethylene foaming material, etc.

[0036] By providing a thermal insulation layer 14 between the heat conducting block 21 and the inner wall of the housing 11, the temperature of the heat conducting block 21 can be maintained within an error range of ±0.2 °C, ensuring a constant temperature and thus effectively improving the accuracy of the measurement results.

[0037] It should be noted that in other embodiments, the housing 11 and the heat conducting block 21 may also be in other shapes such as a cuboid or a cube, and the present disclosure does not impose specific limitations.

[0038] Furthermore, in an embodiment of the present disclosure, the housing 11 is made of aluminum. Using aluminum as the outer shell, it is light in weight and high in strength, and can provide good protection for the heat conducting component 20. Further, the cover 12 may also be made of aluminum.

[0039] Furthermore, in an embodiment of the present disclosure, the heat conducting block 21 is provided with a first chamber 201 for accommodating the heating element 22. The first chamber 201 is provided at the central position of the heat conducting block 21 and may extend downward from the top surface of the heat conducting block 21. The heating element 22 is inserted into the first chamber 201. The heating element 22 may be, for example, an electric heating rod, etc. By heating the heat conducting block 21 through the heating element 22, the entire heat conducting block is ensured to be evenly heated.

[0040] Furthermore, in an embodiment of the present disclosure, the heat conducting block 21 is provided with a second chamber 202 for accommodating the temperature sensor 23. The second chamber 202 may extend downward from the top surface of the heat conducting block 21. The second chamber 202 may be provided at a position far from the first chamber 201, for example, at the edge position of the heat conducting block 21, to avoid interfering with the temperature measurement of the heat conducting block 21. By providing the temperature sensor 23, the temperature of the heat conducting block 21 can be measured in real time to better control the temperature of the heat conducting block 21 and improve the detection accuracy.

[0041] Furthermore, in an embodiment of the present disclosure, the heat conducting block 21 is made of copper, aluminum, copper alloy, aluminum alloy or magnesium alloy. Preferably, the heat conducting block 21 is a copper block, which has excellent heat conduction performance and a fast heating rate.

[0042] Furthermore, in an embodiment of the present disclosure, the heat flux sensor 30 is disposed at one end of the heat conducting block 21 away from the cover 12. Specifically, the heat flux sensor 30 is embedded in the heat conducting block 21. For example, an installation cavity may be opened on the bottom surface of the heat conducting block 21, and the heat flux sensor 30 is disposed in the installation cavity and then sealed with sealant or other materials. By embedding the heat flux sensor 30, it is beneficial to protect the heat flux sensor 30.

[0043] It should be noted that wiring grooves or wiring holes may be opened on the cover 12 or the housing 11 to allow the wires of the heat flux sensor 30, the temperature sensor 23, the heating element 22, etc. to pass through.

[0044] Embodiment 2

[0045] Please refer to Figure 3 , the present disclosure embodiment provides a thermal conductivity measuring instrument, which is different from that of Embodiment 1 in that the thermal conductivity measuring instrument further includes a lifting plate 40, and the lifting plate 40 is connected to the cover body 12 of the installation shell 10 through an elastic buffer 50. The lifting plate 40 is used to be connected to a driving device (such as a driving cylinder) to drive the lifting plate 40 to rise or fall, so as to drive the installation shell 10 to lift and lower.

[0046] Specifically, the elastic buffer 50 includes a connecting column 51, a limiting block 52 and a spring 53. The lifting plate 40 is provided with an avoidance hole. One end of the connecting column 51 is connected to the cover body 12 of the installation shell 10, and the other end passes through the avoidance hole and is connected to the limiting block 52. The spring 53 is sleeved outside the connecting column 51 and is located between the lifting plate 40 and the cover body 12 of the installation shell 10. Specifically, in one embodiment, the connecting column 51 is a double-headed stud, the limiting block 52 is a nut, one end of the double-headed stud is locked with the cover body 12 and the heat conducting block 21, and the other end passes through the lifting plate 40 and is locked with the nut. The middle part of the double-headed stud can move in the avoidance hole of the lifting plate 40, and both ends of the spring are abutted against the lifting plate 40 and the cover body 12 respectively.

[0047] Through the setting of the elastic buffer 50, when the lifting plate 40 descends to drive the installation shell 10 to lower, when it descends to the point where the heat conducting block 21 contacts the object to be measured, the spring 53 can provide a buffering effect, avoiding damage to the object to be measured caused by excessive impact force during pressing, and at the same time ensuring that the heat conducting block 21 contacts and fits with the object to be measured, avoiding measurement errors.

[0048] It should be understood that the above-described multiple examples can be utilized in multiple directions (such as inclined, inverted, horizontal, vertical, etc.) and in multiple configurations without departing from the principles of the present invention. The embodiments shown in the drawings are only shown and described as examples of the effective application of the principles of the present invention, and the present invention is not limited to any specific details of these embodiments.

[0049] Of course, once the above description of the representative embodiments is carefully considered, those skilled in the art will readily understand that various modifications, additions, substitutions, deletions and other changes can be made to these specific embodiments, and these changes are within the scope of the principles of the present invention. Therefore, the foregoing detailed description should be clearly understood to be given only by way of illustration and example, and the spirit and scope of the present invention are defined only by the appended claims and their equivalents.

Claims

1. A thermal conductivity measuring instrument, characterized in that: include: The mounting shell has a mounting cavity; A heat-conducting assembly, comprising a heat-conducting block and a heating element, wherein the heat-conducting block is disposed in the mounting cavity and is provided with a first cavity for accommodating the heating element; as well as The heat flow sensor is arranged at one end of the heat conducting block.

2. The thermal conductivity measuring instrument according to claim 1, characterized in that: The heat conducting component also includes a temperature sensor, and the heat conducting opening is provided with a second chamber for accommodating the temperature sensor.

3. The thermal conductivity measuring instrument according to claim 1, characterized in that: A heat-insulating layer is provided between the heat-conducting block and the side wall of the mounting shell.

4. The thermal conductivity measuring instrument according to claim 3, characterized in that: The heat-insulating layer is formed by filling a gap between the heat-conducting block and the side wall of the mounting shell with a heat-insulating material, and the heat-insulating material is a heat-insulating cotton or a heat-insulating foaming material.

5. The thermal conductivity measuring instrument according to claim 1, characterized in that: The mounting shell comprises a hollow shell and a cover connected to one end of the shell, the cavity of the shell forms the mounting cavity, and the heat flux sensor is embedded in one end of the heat conductive block away from the cover.

6. The thermal conductivity measuring instrument according to claim 5, characterized in that: The cover body is fixedly connected to the heat conducting block via a fastener.

7. The thermal conductivity measuring instrument according to claim 5, characterized in that: The shell is made of aluminum.

8. The thermal conductivity measuring instrument according to claim 1, characterized in that: The heat conducting block is made of copper, aluminum, copper alloy, aluminum alloy or magnesium alloy.

9. The thermal conductivity measuring instrument according to claim 1, characterized in that: It also includes a lifting plate, which is connected to the mounting shell through an elastic buffer.

10. The thermal conductivity measuring instrument according to claim 9, characterized in that: The elastic buffer comprises a connecting column, a limit block and a spring. The lifting plate is provided with an avoidance hole. One end of the connecting column is connected to the mounting shell, and the other end passes through the avoidance hole and is connected to the limit block. The spring is sleeved on the connecting column and is located between the lifting plate and the mounting shell.

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