Solar vacuum tube

Abstract

The invention provides a solar vacuum tube. A hot water system is high in utilization rate and work reliability. The solar vacuum tube comprises a plurality of heat absorption plates (4), a U-shaped water pipe (5) and a blocking cap (6). The heat absorption plates (4) are arranged in an inner glass pipe (1). The closed ends of the U-shaped water pipe (5) are arranged in the inner glass pipe (1). Two opening ends of the U-shaped water pipe (5) are arranged outside the inner glass pipe (1). The U-shaped water pipe (5) is connected with the heat absorption plates (4). The blocking cap (6) is arranged at an opening end of the inner glass pipe (1). The heat absorption plates (4) are metal plates, and the metal plates are coated with heat absorption coatings (7). The heat absorption coatings (7) comprise, by weight, 30-40 parts of epoxy modified polyurethane resin, 7-10 parts of drying oil alcohol acid resin, 6-8 parts of manganese dioxide, 2-4 parts of ferroferric oxide, 1-3 parts of titanium dioxide, 10-15 parts of paraxylene, 1-5 parts of assistant, 6-10 parts of linoleic acid, 1-2 parts of absorption enhancer and 5-13 parts of tributyl citrate.

Description

technical field [0001] The invention relates to the technical field of solar water heaters, in particular to a solar vacuum heat collecting tube used for solar water heaters. Background technique [0002] Solar energy is a green energy in today's society. People can save more energy by using solar energy, so we should make good use of solar energy and play its due role. Solar water heaters are favored by people because of their use of solar energy, no pollution, convenient use, and low investment costs for long-term use, and they have been well developed. Wherein, the solar vacuum heat collecting tube is one of the important components of the solar water heater, and its thermal efficiency directly affects the performance of the solar water heater. [0003] The solar vacuum heat collecting tube of prior art is as figure 1 As shown, it includes an inner glass tube 101 and an outer glass tube 102; the outer wall of the inner glass tube 101 is coated with a heat-absorbing coat...

AI Technical Summary

Problems solved by technology

The solar vacuum heat collecting tube with the above structure has the following disadvantages: due to the large amount of water stored in the inner glass tube, the temperature of the water in the tube rises slowly, and the hot water in the tube cannot be taken out completely, resulting in a low utilization rate of the hot water system; in addition, because the inner glass tube It is filled with water, if it is damaged during operation, the entire solar system will stop working, thus making its working reliability lower

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