Direct through glass vacuum pipe, manufacture method and air heat collector

Abstract

The invention discloses a direct through glass vacuum pipe which comprises a glass outer pipe, an inner pipe assembly formed through respectively welding two ends of a metal bellows with two sections of glass inner pipe, a stainless steel support clamp and a getter, wherein a selective coating is plated on the outer wall of the inner pipe assembly and is arranged at the inner part of the glass outer pipe, the inner pipe assembly is in vacuum sealing with the glass outer pipe, and the stainless steel support clamp and the getter are assembled between the inner pipe assembly and the glass outer pipe. The direct through glass vacuum pipe is manufactured by adopting the following steps of blanking and washing, welding the glass inner pipe with the bellows, coating a film, assembling the clamp, assembling, exhausting, baking a pin and the like. An air heat collector consisting of the direct through glass vacuum pipe comprises at least one group of heat collector units which are transversely or longitudinally arranged and communicated. According to the invention, the problems of air blockage of the vacuum pipe air heat collector and easy oxidization of a melting port of the metal bellows are solved, and the production quality is improved. Meanwhile, the heat utilization efficiency is increased, the processing difficulty and cost are reduced, and the industrialized production is facilitated.

Description

technical field [0001] The invention relates to the technical field of mid-heat utilization of solar energy, in particular to a straight-through glass vacuum tube, a preparation method of the straight-through glass vacuum tube and an air heat collector prepared from the straight-through glass vacuum tube. Background technique [0002] The existing all-glass vacuum tube is a structure similar to an elongated thermos bottle, with an outlet at one end, and is mainly used in the low-temperature field of solar water heaters (40-80° C.) to manufacture solar water heater products. It has a development history of 20 to 30 years, and the output in China accounts for 70% of the world. However, the water in the vacuum tube is not easy to take out, resulting in a loss of 20% thermal efficiency; in addition, the structure of the outlet at one end will cause air blockage, which is not suitable for solar air collectors. [0003] In order to solve the problem of air blockage caused by an o...

AI Technical Summary

Problems solved by technology

[0006] The existing design structure of glass vacuum tube is the heat collecting element with water and oil as the working medium, and the small flow channel is not suitable for the solar drying system of the heat collector with air as the working medium

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