Phase-change heat accumulation type heat flow sensor

Abstract

The invention relates to a phase-change heat accumulation type heat flow sensor mainly consisting of a shell, an upper cover, a lower cover, a back cover, a phase-change heat accumulation body, a constantan circular foil, two nickel chrome wires, a thermoelectric couple, a four-hole aluminum oxide ceramic tube and the like, wherein the surface of the constantan circular foil is blacked, the constantan circular foil and the two nickel chrome wires form a measurement end surface sensitive body, the upper cover is welded with the shell after being welded with the measurement end surface sensitive body; after the phase-change heat accumulation body is screwed in, the lower cover is welded with the shell; and the two nickel chrome wires at the constantan circular foil and the thermoelectric couple are drawn out by the back cover in a fastening manner after passing through the four-hole aluminum oxide ceramic tube. According to the phase-change heat accumulation type heat flow sensor disclosed by the invention, by utilizing the phase-change heat accumulation principle, the working time is remarkably prolonged; by utilizing an E-shaped difference thermocouple, the high temperature resistance of the measurement end surface is largely improved; and by utilizing the thermocouple, a measurement end part is added with a temperature monitoring function and the situations that the measurement end part is molten, burn and the like are avoided.

Description

technical field [0001] The invention belongs to the field of heat flow and temperature measurement, and in particular relates to a phase change heat storage type heat flow sensor. Background technique [0002] With the continuous development of science and technology, the energy problem has become increasingly prominent, and the work of energy saving and consumption reduction has been continuously carried out. The theory and technology of heat flow detection have been paid more and more attention, and heat flow sensors have been widely used. [0003] The principle structure of the classic heat flow sensor is as follows: figure 1 As shown, the heat flow sensor using this principle structure is also called GARDON meter (Gordon meter). Its measurement principle: as a sensitive element, the constantan round foil is painted black on its surface to facilitate the absorption of heat flux. The copper heat sink inside the cylindrical sensor and the constantan round foil form a T-ty...

AI Technical Summary

Problems solved by technology

[0006] When the heat flow sensor is measuring, its measuring end face continuously absorbs heat. When cooling methods such as water cooling and air cooling cannot be used, it needs to use its own heat storage method to work. Generally, a high melting point metal block is used for heat storage, and its working time is short; The sensitive element of the traditional heat flow sensor uses a T-type differential thermocouple, the upper limit of which is only 350°C, and the high temperature resistance of the measuring end face is poor; The head part is melted, burnt, etc.

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