Vacuum collector tube and manufacturing method thereof

Abstract

The invention provides a vacuum collector tube and a manufacturing method thereof, and the method comprises the following steps: after the manufacturing of a glass inner tube is completed, when preparing a film on the outer surface of the glass inner tube, firstly selecting the aluminium foil or the copper foil as a metal substrate; utilizing the sputtering process to form an aluminium nitrogen compound absorbing layer or utilizing the electroplating process to form a chromium plating absorbing layer on one side of the metal substrate; utilizing the polishing process to polish the surface of the metal substrate to form a reflecting layer on the other side of the metal substrate; clipping the film, and then coating the prepared film on the outer surface of the glass inner tube and utilizing the heat-conducting transparent organic adhesive to adhere the prepared film on the outer surface of the glass inner tube seamlessly; carrying out tight closeness and butt joint on the edge; and finally forming the interval space between the glass inner tube and the glass outer tube into vacuum and sealing the connector. The heat absorption capacity of the vacuum collector tube is higher, and can reach 96% to 98%; the film is not easy to fall off; the service life is long; the color consistency is good; and the operation is simple and the manufacturing cost is low by adopting the method.

Description

technical field [0001] The invention relates to the technical field of solar water heaters, in particular to a vacuum heat collecting tube with a film layer that is not easy to fall off and has uniform appearance and color and a manufacturing method thereof. Background technique [0002] The important form of solar energy utilization is the utilization of light and heat. The vacuum heat collector tube is the key component of the solar water heater and heat collector. The heat absorption performance and heat utilization efficiency of the absorbing layer have a great influence on the performance of the solar water heater. [0003] At present, the heat absorbing layer of the conventional vacuum tube is generally coated with aluminum-nitrogen / aluminum coating or stainless steel-carbon / copper coating on the outer wall of the inner glass tube by magnetron sputtering. The absorption rate of this process is generally about 86%, and the highest is 92%. %about. In addition, this proc...

AI Technical Summary

Problems solved by technology

In addition, this process has very high requirements on the cleanliness of the glass tube. As long as there are spot stains and oil stains, it is easy to cause small area peeling off.

The stripped vacuum tube tends to fall off in a large area during long-term use, thus losing the heat-absorbing function

At the same time, traditional vacuum tubes are coated by a single coating machine, which is affected by voltage, current, and gas fluctuations, and the color of each vacuum tube is quite different.

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