Full-glass vacuum heat collection element changing vacuum degree for stagnation protection

Abstract

In the graph 1, a cover glass tube (1) and an inner glass tube (2) are in sealed connection in a concentric mode to form a full-glass vacuum heat collection element changing the vacuum degree for stagnation protection. On the non-light-facing face of an area, with the angle of circumference being 140 degrees, of the inner glass tube (2), a steel wire snap spring is connected with an activated carbon fiber adsorbing material (4) in a low heat resistance mode, a fusion-sealing position of the inner glass tube (2) extends outwards by a section and then is sealed, vacuum pumping is conducted on the interior of the inner glass tube (2), working media are poured into the inner glass tube (2), and the inner glass tube (2) is sealed to be made into a heat tube. According to the working principle of the embodiment of the graph 1, sunlight penetrates through the cover glass tube (1) and is converted into heat energy on a film layer of the inner glass tube (2), and the heat energy is output through a cold end (5). When heat is collected normally, the temperature of the surface of the inner glass tube (2) is no more than 90 DEG C, and the adsorbing material cannot be desorbed. When stagnation is conducted, the temperature of the surface of the inner glass tube (2) is high, and the vacuum degree of a vacuum heat insulating layer (3) declines as the adsorbing material is desorbed and emits gas. The inner glass tube (2) releases partial heat energy to the environment through gas in the vacuum heat insulating layer (3), and excessive rising of the stagnation temperature is limited.

Description

technical field [0001] The invention relates to an all-glass vacuum heat-collecting element protected by air drying with variable vacuum degree. Background technique [0002] The existing all-glass heat pipe vacuum heat collection tube made of integrated heat pipe and inner glass tube has extremely high absorption rate and extremely low emissivity. While obtaining satisfactory heat collection performance and heat collection temperature, it also enables Air-drying temperature reaches above 230°C. Such a high air drying temperature sometimes brings about the problem of excessively high vapor pressure of the integrated heat pipe working fluid. Contents of the invention [0003] The object of the present invention is to provide a variable vacuum degree air protection all-glass vacuum heat collecting element. [0004] The technical scheme adopted by the present invention to solve the technical problem: use the cover glass tube and the inner glass tube to seal concentrically ...

AI Technical Summary

Problems solved by technology

Such a high air drying temperature sometimes leads to the pro...

Images