Flanged inverted glass metal vacuum heat collector

Abstract

A turnup inverse sealing type glass metal vacuum heat collecting pipe is a heat absorption pipe applied to a solar heat collecting device. Glass-metal sealing is adopted; by the turnup structure of a glass outer pipe, the glass-metal sealing joint is born with pressure changed from drawing force, the force bearing ability of the joint is greatly improved and the damage rate of the heat collecting pipe in usage is reduced, so that the whole structure of the sealing and an expansion difference compensating device is compact, the effective daylighting area of the heat collecting pipe is improved, and the temperature fluctuation of the glass-metal sealing joint is reduced.

Description

Technical field [0001] The invention relates to a solar heat collecting device, in particular to a glass-metal sealed vacuum solar heat collecting tube. Background technique [0002] At present, most of the high-temperature solar collector tubes use metal inner tube, glass outer tube and glass-metal sealing technology, and the interface between glass and metal is on the extension line of the glass outer tube, or the glass outer tube is flared. Or on the extension line after shrinking, due to the huge difference in expansion and contraction between glass and metal at high temperature, although various sealing structures and bellows are used to absorb the expansion and contraction difference, because the interface between glass and metal is in the glass outer tube. On the extension line, when the bellows is stretched or compressed to a certain extent, the metal tube is stretched or compressed and the shrinkage force of the vacuum on the bellows will eventually produce tensile ...

AI Technical Summary

Problems solved by technology

Although the CN1837715 patent solves part of the axial force problem with the flanging structure, its glass-metal bonding connection method makes it impossible to solve the radial expansion difference between glass and metal, which will cause great damage to it. In addition, its glass-metal The metal bonding connection method cannot meet the requirements of high-temperature vacuum exhaust during manufacturing, nor can it meet the requirements of long-term use without air leakage under repeated large temperature differences

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