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Steady-state-method-based device for measuring block heat conductivity coefficient

A technology of thermal conductivity and measuring block, applied in the field of block thermal physical property testing, can solve the problems of unfavorable sample installation and disassembly, cold plate and central hot plate cannot be replaced, single thickness of the sample to be tested, etc., to achieve the effect of flexible testing

Pending Publication Date: 2018-04-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the distance between the two cold plates of this device is fixed, resulting in a single thickness of the sample to be tested, and only a block with a thickness of 10mm can be measured. In addition, the cold plate and the central hot plate of this device cannot be replaced, and only a circle with a diameter of 80mm can be measured. Plate samples also lead to a series of shortcomings such as sample installation and removal difficulties (there is no sliding matching groove, which is not conducive to sample installation and removal)

Method used

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  • Steady-state-method-based device for measuring block heat conductivity coefficient
  • Steady-state-method-based device for measuring block heat conductivity coefficient
  • Steady-state-method-based device for measuring block heat conductivity coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 A device for measuring block thermal conductivity based on steady-state method

[0052] A device for measuring bulk thermal conductivity based on a steady-state method, the device includes a sample stage 5 for placing a sample to be tested, a vacuum chamber 6 for providing a certain vacuum environment for the sample to be tested, and a vacuum chamber 6 for providing a vacuum for the sample to be tested A constant temperature system 10 providing a certain temperature environment; the sample stage 5 is arranged in the vacuum chamber 6; the vacuum chamber 6 is arranged in the constant temperature system 10;

[0053] The sample stage 5 includes a heat transfer base 4 fixed on the flange, a central hot plate 1 located on the side of the heat transfer base 4 away from the flange, two identical cooling plates symmetrically arranged on both sides of the central hot plate 1 . plate 3, and four thermometers respectively arranged on the heat transfer base 4, the centr...

Embodiment 2

[0063] Example 2 Measure the bulk insulation material at room temperature (25°C), vacuum (10 -3 Thermal conductivity at Pa)

[0064] Use the device shown in Example 1 to measure the temperature of the bulk insulation material at room temperature (25°C) and vacuum (10 -3 Pa) under the thermal conductivity, the method is as follows:

[0065] 1) Installation of the sample stage and the sample to be tested

[0066] According to the specifications of the sample to be tested 2 (in the present embodiment, the sample to be tested 2 is a circular plate with a diameter of 100mm and a thickness of 15mm) the appropriate central hot plate 1 is selected (in this embodiment, the central hot plate 1 is Circular plate with a diameter of 100 mm) and cold plate 3 (the cold plate 3 is a square plate with a side length of 100 mm), two identical cold plates 3 are installed with the cold plate on the heat transfer base 4 through the cold plate installation port 17 Slot 16 is coated with silicone ...

Embodiment 3

[0078] Example 3 Measure the bulk insulation material at room temperature (25°C), vacuum (10 -3 Thermal conductivity at Pa)

[0079] Use the device shown in Example 1 to measure the temperature of the bulk insulation material at room temperature (25°C) and vacuum (10 -3 Pa) under the thermal conductivity, the method is as follows:

[0080] 1) Installation of the sample stage and the sample to be tested

[0081] According to the specifications of the sample to be tested 2 (in this embodiment, the sample to be tested 2 is a square plate, the side length is 100mm, and the thickness is 12mm) and the specification selects a suitable central hot plate 1 (in this embodiment, the central hot plate 1 is Square plate, side length is 100mm) and cold plate 3 (cold plate 3 is a square plate, side length is 120mm), two identical cold plates 3 are installed with the cold plate on the heat transfer base 4 through the cold plate installation port 17 Slot 16 is coated with silicone grease an...

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Abstract

The invention discloses a steady-state-method-based device for measuring a block heat conductivity coefficient. The device comprises a constant-temperature system, a vacuum chamber and a sample platform, wherein the vacuum chamber is arranged in the constant-temperature system and comprises a vacuum chamber cylinder, a flange and a vacuum lead tube, and the vacuum lead tube penetrates the flange to be communicated with the inner cavity of the vacuum chamber cylinder; the sample platform is arranged in the vacuum chamber and comprises a heat transfer base, a central hot plate, two cold plates and thermometers, the heat transfer base is fixedly combined with the flange, the central hot plate is located on one side, away from the flange, of the heat transfer base, the two cold plates are symmetrically arranged on two sides of the central hot plate, and one thermometer is arranged on each of heat transfer base, the central hot plate and each cold plate; each cold plate is provided with a cold plate mounting port; the heat transfer base is provided with cold plate mounting grooves, and the cold plate mounting ports are slidably matched with the cold plate mounting grooves to allow the cold plates to be able to move close to or away from the central hot plate. By the device, samples of various specifications and sizes can be measured, and the heat conductivity coefficient can be flexibly and conveniently measured.

Description

technical field [0001] The invention relates to the technical field of thermal physical property testing of blocks. More specifically, it relates to a device for measuring bulk thermal conductivity based on a steady-state method. Background technique [0002] Foam insulation materials are an important class of bulk insulation materials. During the preparation process, foaming agents are used to generate bubbles, and many tiny pores (usually micron-sized closed pores) are formed inside the insulation material to achieve the purpose of heat insulation. Foam insulation materials are generally divided into foam plastics, foam glass, foam rubber, etc. Among them, foam plastics have the best comprehensive performance. Foam plastic is a thermal insulation material formed by heating and foaming with polymer or synthetic resin as raw material, adding foaming agent and stabilizer. It has the characteristics of low density, low thermal conductivity, low temperature resistance, vibrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 张敬杰王平严开祺
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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