Plane table thermo-conductivity meter based on guarded hot plate method

A flat-plate heat conduction meter and protective hot-plate method technology, applied in the field of measuring instruments, can solve problems such as poor linearity and poor measurement accuracy of analog measurement, and achieve the effects of accurate electric power measurement, accurate measurement, and uniform measurement temperature

Inactive Publication Date: 2016-03-02
JILIN UNIV
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AI Technical Summary

Problems solved by technology

The instrument usually measures the heating electric power range of 0 ~ 10W, within 27% of the minimum range, which is the area with poor linearity of analog measurement and poor measurement accuracy.

Method used

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  • Plane table thermo-conductivity meter based on guarded hot plate method
  • Plane table thermo-conductivity meter based on guarded hot plate method
  • Plane table thermo-conductivity meter based on guarded hot plate method

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Embodiment Construction

[0019] refer to figure 1 , image 3 , a flat-plate heat conduction instrument using a protective hot plate method, the heat conduction instrument includes a cooling unit 1, a vapor chamber 2, a cold surface thermocouple 4, a tracking thermocouple 5, a hot surface thermocouple 6, a protection heater 7, and a heating metering unit 8 and electrical control system, the cooling unit 1, vapor chamber 2, test piece 3, cold surface thermocouple 4, tracking thermocouple 5, and hot surface thermocouple 6 are up and down relative to the protection heater 7 and the heating metering unit 8 The same two sets are arranged symmetrically; wherein the protective heater 7 and the heating metering unit 8 are arranged on the same plane in the middle; the cold surface thermocouple 4 is installed in the vapor chamber 2 of the cooling surface and is connected in parallel at multiple points; The surface thermocouple 6 is installed in the soaking plate 2 of the heating surface, corresponding to the po...

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Abstract

The invention relates to the field of measuring instruments, in particular to a plane table thermo-conductivity meter based on a guarded hot plate method. On the basis of an existing thermo-conductivity meter, a voltage input method of heating power of protective heating units is improved, and automatic follow-up is conducted according to the hot surface temperature of a metering unit; a flow and heat exchange mode of cooling water in cooling units is improved, and the accuracy of equalization of the cooling surface temperature is increased; the temperature measurement accuracy of hot surfaces, cold surfaces and the protective heating units of test pieces are increased, and the electric power measurement accuracy of heating of the metering unit is increased through a digital electric power meter. According to the plane table thermo-conductivity meter based on the guarded hot plate method, operation is easy, and experimental data are not needed; flow of the cooling water is reasonable, the cooling temperature is uniform, and the temperature difference is small; for temperature measurement, electric power measurement of heating of the metering unit is accurate, and the electric power measurement is accurate to mW level; therefore, the coefficient of thermal conductivity is greatly increased.

Description

technical field [0001] The invention relates to the field of measuring instruments, in particular to an instrument for measuring the thermal conductivity of a plate using a guarded hot plate method. Background technique [0002] Thermal conductivity is an important parameter of thermal insulation materials, especially in chemical and construction industries where heat transfer is involved, and accurate measurement of thermal conductivity is even more important. The thermal conductivity is a function of the temperature of the material itself, and is generally determined by experimental methods, which are mainly divided into steady-state methods and unsteady-state methods. Among them, the guarded hot plate method is a standard steady-state measurement method, which is suitable for measuring dry specimens and is widely used in engineering, national defense and university teaching experiments. The advantages of calibration and other advantages have always been valued, so a ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 赵晓文矫振伟邱俊达宋薇
Owner JILIN UNIV
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