Hollow heat source

Abstract

A hollow heat source comprises a hollow substrate, a heating layer and at least two electrodes, wherein, the heating layer is arranged on the surface of the hollow substrate; the two electrodes are arranged at intervals and are electrically connected with the heating layer respectively; the heating layer comprises a carbon nano tube layer which comprises a plurality of mutually wound carbon nano tubes.

Description

technical field [0001] The invention relates to a hollow heat source, in particular to a hollow heat source based on carbon nanotubes. Background technique [0002] Heat sources play an important role in people's production, life and scientific research. The hollow heat source is a kind of heat source, and its characteristic is that the hollow heat source has a hollow structure, and the object to be heated is arranged in the hollow of the hollow structure to heat the object. Therefore, the hollow heat source can heat all parts of the object to be heated at the same time. Wide area, uniform heating and high efficiency. Hollow heat sources have been successfully used in industrial fields, scientific research fields, or living fields, such as factory pipes, laboratory heating furnaces, or electric ovens for kitchen utensils, etc. [0003] The basic structure of a hollow heat source usually includes a base and an electric heating layer arranged on the base. By passing an elect...

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Problems solved by technology

However, the use of metal wire as the electric heating layer has the following disadvantages: first, the surface of the metal wire is easily oxidized, resulting in an increase in local resistance and thus being blown, so the service life is short; second, the metal wire is gray body radiation, so the heat The radiation efficiency is low, the radiation distance is short, and the radiation is uneven; third, the metal wire has a high density, is heavy, and is inconvenient to use

[0005] However, the use of carbon fiber paper as the heating layer has the following disadvantages: First, the thickness of carbon fiber paper is relatively large, generally tens of microns, which makes it difficult for the hollow heat source to be made into a microstructure, and cannot be applied to the heating of micro devices.

Second, because the carbon fiber paper contains the paper substrate, the carbon fiber paper has a higher density and a larger weight, which makes it inconvenient to use the hollow heat source of the carbon fiber paper

Third, due to the random distribution of pitch-based carbon fibers in the carbon fiber paper, the carbon fiber paper has low strength, poor flexibility, and is easy to break, which limits its scope.

Fourth, the electrothermal conversion efficiency of carbon fiber paper is low, which is not conducive to energy saving and environmental protection

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