Thermal conductivity coefficient measurement instrument for solid material

A technology of thermal conductivity and solid materials, which is applied in the field of material thermal conductivity testing, can solve the problems of low accuracy and achieve the effect of reducing production costs and high stability

Inactive Publication Date: 2009-06-24
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make a good thermal contact between the material to be tested and the heat strip, it is necessary to add some oil with relatively low viscosity on their contact surface, otherwise the accuracy of the measurement is not high

Method used

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  • Thermal conductivity coefficient measurement instrument for solid material
  • Thermal conductivity coefficient measurement instrument for solid material
  • Thermal conductivity coefficient measurement instrument for solid material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] refer to image 3 A top view of the structure of the heating chip of the present invention shown, and Figure 4 and Figure 5 gives image 3 The schematic diagram of the enlarged structure of local area A and local area B in the middle shows the size of the heating wire used in the present invention, the unit is mm in the figure, and the material selected for the heating sheet is a 20 μm thick pure nickel sheet.

[0059] From image 3 It can be seen from the figure that a solid material thermal conductivity measuring instrument of the present invention includes: a heating sheet 300 for generating heat, and the heating sheet 300 includes: a first heating belt 301, a second heating belt 302, and a third heating belt distributed side by side. 303; the first heat band 301 and the third heat band 303 respectively include a first rectangular groove 304 and a second rectangular groove 305, the second heat band 302 includes two first rectangular grooves 304 and two second re...

Embodiment 2

[0066] The measurement principle of the constant voltage source measuring instrument and the corresponding measuring instrument device are described in detail below in conjunction with the accompanying drawings:

[0067] refer to Figure 6 The schematic diagram of the equivalent circuit of the heating chip of the present invention is shown, in this embodiment, a constant voltage is applied to the heating chip, that is, in Figure 6 A constant voltage is applied between points A and D of the Wheatstone bridge shown, as Figure 7 As shown in the schematic diagram of the device structure, the measuring instrument includes a constant voltage source 005 for providing energy to the heating plate 003, a material to be tested 004 and a material to be tested 002 respectively attached to the upper and lower surfaces of the heating plate 003 (in this embodiment, the material to be tested is The test material 004 and the test material 002 are the same), the data acquisition system 006 fo...

Embodiment 3

[0110] The measurement principle of the constant power source measuring instrument and the corresponding measuring instrument device are described in detail below in conjunction with the accompanying drawings:

[0111] In this embodiment, a constant power source with stable output power is used to provide energy to the heating plate, so as to obtain another experimental measurement device and corresponding measurement principle for measuring thermal conductivity. The structure of the heating plate is as image 3 As shown, the structure diagram of the constant power measuring instrument is shown in Figure 11 As shown, the biggest difference between the constant power source and the constant voltage source is that the internal circuit is different, refer to Figure 6 shown in the equivalent circuit diagram; and, combined with Figure 12 Analyze the equivalent circuit diagram of the constant power source;

[0112] When the material to be tested is measured with a constant pow...

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Abstract

The invention provides an instrument for measuring the coefficient of heat conductivity of a solid material. The instrument comprises a heating plate, wherein, the heating plate comprises a first hot band, a second hot band and a third hot band which are distributed side by side; the first hot band includes a first rectangular groove and a second rectangular groove, and the third hot band includes a first rectangular groove and a second rectangular groove; the second hot band includes two first rectangular grooves and two second rectangular grooves; one first rectangular groove and one second rectangular groove in each hot band form one resistor; the resistors are electrically connected with each other in the form of Wheatstone bridge; and the measuring instrument further includes a constant voltage source or a constant power source, and a data acquisition system. The measuring instrument is capable of measuring the coefficient of heat conductivity from a heat insulating material to a metal material in a very short period of time, with the measuring range being 0.01-300Wm<-1>K<-1> and the uncertainty of the heat conductivity coefficient obtained within 5%.

Description

technical field [0001] The invention relates to the technical field of testing material thermal conductivity, in particular to a thermal conductivity measuring instrument for solid materials. Background technique [0002] The physical parameter for evaluating the thermal insulation performance of a material is the thermal conductivity of the material itself, and its reciprocal determines the thermal resistance of the material. This is a thermophysical parameter that plays a decisive role in evaluating the thermal insulation performance of a material; Physical parameters have important uses in the fields of chemical engineering, materials, energy, power and refrigeration engineering, and are indispensable basic data in many industrial processes and product designs. With the rapid development of modern industry, the measurement of thermal conductivity of solid materials has been paid more and more attention by people. [0003] The thermal conductivity of a substance can be ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
Inventor 林鸿张金涛薛寿清黄涛李宏伟董亮孙云飞王艳秋
Owner NAT INST OF METROLOGY CHINA
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