Reducing condensation all-glass heat tube type vacuum solar heat-collecting tube

Abstract

The invention discloses a reducing condensation all-glass heat tube type vacuum solar heat-collecting tube, and belongs to the technical field of solar heat utilization. The vacuum solar heat-collecting tube comprises an inner glass tube, an outer glass tube and a glass butt joint tube, wherein the inner glass tube and the outer glass tube are sleeved with each other and are eccentric, one ends of the inner glass tube and the outer glass tube are closed, the other ends are annually weld and sealed, and the inner glass tube and the outer glass tube are vacuumized; a reflecting aluminum mirror surface is arranged on the outer glass tube; a selective absorbing coating is coated on the inner glass tube; the middle part of the inner glass tube is in butted joint with the glass butt joint tube; the glass butt joint tube is a condensing section; a hemispherical part of the inner glass tube and the part close to the hemispherical part are evaporation sections; the hemispherical part of the inner glass tube is provided with an exhaust outlet sealed orifice of the evaporation section; and the hemispherical end of the inner glass tube is fixed with a getter. The external diameter of the glass butt joint tube is greater than the external diameter of the inner glass tube, and less than the external diameter of the outer glass tube. By the vacuum solar heat-collecting tube, the hot water circulation path is greatly shortened, the heat exchange efficiency is high, the water in the tube can be used, and the problem that the inner glass tube is ruptured caused by non-fluent hot water circulation because the inner glass tube is too long can be avoided.

Description

technical field [0001] The invention relates to the technical field of solar thermal utilization, in particular to a variable-diameter concentrating all-glass heat-pipe vacuum solar heat-collecting tube. Background technique [0002] As we all know, the all-glass vacuum solar collector tube as a whole is like an elongated thermos bile, which is composed of two inner glass tubes and outer glass tubes that are set together. The outer surface of the tube is deposited with a solar selective absorbing surface, coating or film system to form a heat absorber, so as to convert solar energy into heat energy and heat the heat transfer fluid in the inner glass tube. [0003] Existing technology one [0004] The inner glass tube and the outer glass tube in the all-glass vacuum heat collecting tube are arranged concentrically. The all-glass vacuum heat collecting tube adopts the design of single-ended opening. , and a spring clip with getter is provided, the hemispherical support of th...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the heat exchange efficiency of the existing technology 2 is reduced, the water in the tube cannot be used, and the heat accumulation in the lower part of the vacuum tube causes the inner glass tube to burst, the embodiment of the present invention provides a variable-diameter concentrator Glass heat pipe vacuum solar collector tube

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