Straight-through vacuum heat collecting element with variable-vacuum-degree idle sunning protection

Abstract

The invention discloses a straight-through vacuum heat collecting element with variable-vacuum-degree idle sunning protection. The straight-through vacuum heat collecting element is characterized in that a covering glass tube 1 and an inner glass tube 2 are concentrically mounted in an inlaid manner, and two ports of the covering glass tube 1 and two ports of the inner glass tube 2 are respectively aligned with one another and are melted and sealed; a selective absorption film is deposited on the inner glass tube 2; a non-sunny surface in an area with a circumferential angle of about 140 degrees of the inner glass tube 2 is connected with an activated carbon fiber adsorption material 4 by a steel wire clamp spring in a low-heat-resistance manner, and the length of the activated carbon fiber adsorption material 4 is about 200 millimeters, so that the straight-through vacuum heat collecting element with variable-vacuum-degree idle sunning protection is manufactured. A working principle of an embodiment shown in a figure 1 includes that sunlight shines through the covering glass tube 1 and is converted into heat energy on the film of the inner glass tube 2, and the heat energy is transmitted to water in the inner glass tube 2 via the wall of the inner glass tube 2. The straight-through vacuum heat collecting element has the advantages that when heat is collected normally, the surface temperature of the inner glass tube 2 is not higher than 90 DEG C, the adsorption material is prevented from performing desorption; when in idle sunning, the surface temperature of the inner glass tube 2 is quite high, at the moment, the adsorption material 4 performs desorption, gas is released, and accordingly a vacuum degree of a vacuum heat-insulation layer 3 is reduced; a part of the heat energy is released to an environment by the inner glass tube 2 via the gas in the vacuum heat-insulation layer 3.

Description

technical field [0001] The invention relates to a variable vacuum degree air drying protection straight-through vacuum heat collecting element. Background technique [0002] There is an all-glass vacuum heat collecting tube with two ends. In order to overcome the excessive stress formed by the temperature difference between the inner glass tube and the cover glass tube, the cover glass tube and the inner glass tube are melted and sealed at one end, and a section of spring is used at the other end. Made in the form of glass tube bridges. However, spring glass tubes are difficult to bridge and are prone to clogging due to fouling. Contents of the invention [0003] The purpose of the present invention is to provide a variable vacuum degree air protection straight-through vacuum heat collecting element. [0004] The technical scheme adopted by the present invention to solve the technical problem: by melting and sealing the inner glass tube and the cover glass tube at both...

AI Technical Summary

Problems solved by technology

However, the spring glass tube is difficult to bridge and is easy to block due to fouling

Images