Solar evacuated collector pipe

Abstract

The invention relates to a solar evacuated collector pipe which comprises a metal pipe and a glass pipe, wherein the glass pipe is installed on the periphery of the metal pipe in a sleeved mode, a vacuum layer is arranged between the glass pipe and the metal pipe, a corrugated pipe is arranged at each of both ends of the metal pipe, one ends of the corrugated pipes are in sealed connection with the metal pipe, and the other ends of the corrugated pipes are in sealed connection with the glass pipe. The solar evacuated collector pipe has the advantages that heat collection efficiency is greatly improved, a heat preservation effect is good, a reflectance coating is coated on the inner wall of the glass pipe, dust cannot be adhered, and heat collection efficiency of the collector pipe is ensured for a long time.

Description

technical field [0001] The invention relates to the field of solar water heaters, in particular to a heat collecting tube for solar water heaters. Background technique [0002] Solar water heaters mainly absorb heat through vacuum heat collecting tubes. The current heat collecting tubes are made of inner and outer double layers. The outer wall of the inner tube is coated with a selective absorbing coating to absorb the accumulated heat. heat, [0003] At present, domestic solar vacuum heat collection tubes generally adopt metal tubes covered with solar absorbing coatings, and the metal tubes are covered with glass tubes, and the space between the glass tubes and the metal tubes is evacuated. In order to compensate for the expansion of the glass tube smaller than that of the metal tube after heating up, bellows are often used to compensate for the difference in expansion, and the bellows and glass are connected by a Kovar alloy transition. [0004] In addition, there is als...

AI Technical Summary

Problems solved by technology

This kind of heat collecting tube has two main disadvantages: one is that the glass tube and the corrugated tube that is also set outside the metal tube are sealed by Kovar alloy, which increases the difficulty of operation; The diameter of the heat-absorbing tube in the device should be large, otherwise, after the light is concentrated, some of the energy will overflow the absorption range of the heat-absorbing tube

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