Solar vacuum tube

Abstract

The invention provides a solar vacuum tube. The solar vacuum tube comprises a double-layered tube structure, wherein the double-layered tube structure is formed by arranging an inner tube in an outer tube; the inner wall of the outer tube is connected with the outer wall of the inner tube through a sealing structure; a vacuum cavity is formed by the inner wall of the outer tube, the outer wall of the inner tube and the sealing structure; projections are arranged on the peripheral surface of the outer tube; a reflecting film is coated on the inner wall of the outer tube; and a solar absorbing layer and an anti-reflection film are arranged on the peripheral surface of the outer wall of the inner tube from inside to outside. The solar vacuum tube is simple in structure and convenient to manufacture; the heat collection effect of the vacuum tube is further improved; heating energy on water is improved; the heating speed of water in a water tank of a solar water heater is increased; and a heating effect is obvious.

Description

technical field [0001] The present invention relates to a solar device for generating thermal energy, and more particularly to a solar vacuum tube with high efficiency for absorbing solar light energy. Background technique [0002] The solar vacuum tube is the main core component of solar thermal utilization to collect sunlight. A solar vacuum tube generally includes a glass outer tube and an inner tube. The outer wall of the inner tube is coated with a selective absorbing coating, and the interlayer of the inner and outer tubes is pumped into a high vacuum state. When sunlight shines on the absorbing coating of the inner tube through the outer glass tube, it is converted into heat energy and heats the heat transfer fluid in the inner tube. Usually the outer tube of the existing solar vacuum tube is made of transparent glass, but the sunlight irradiated on the inner tube through the outer tube has only a 50% absorption rate, because there is always half of the backlight sur...

AI Technical Summary

Problems solved by technology

Usually the outer tube of the existing solar vacuum tube is made of transparent glass, but the sunlight irradiated on the inner tube through the outer tube has only a 50% absorption rate, because there is always half of the backlight surface on the inner tube without light irradiation, and in addition The choice of coating on the inner tube will also affect the absorption of light energy, thereby reducing the ability of the inner tube to absorb solar radiation, so that the heat absorption efficiency of solar vacuum cannot be fully utilized

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