Efficient long-service-life solar heat collection tube

Abstract

The invention discloses an efficient long-service-life solar heat collection tube. The solar heat collection tube comprises a heat collection tube body, and a one-way infrared heat conduction layer is arranged inside the heat collection tube body; a first inner tube is arranged inside the one-way infrared heat conduction layer, and filled with a hard coating; and a second inner tube is arranged inside the first inner tube, and the second inner tube is filled with a metal layer. According to the efficient long-service-life solar heat collection tube, as the one-way infrared heat conduction layer is arranged, the heat releasing of the heat collection tube can be reduced while the heat absorption of the heat collection tube is increased; and as the hard coating and the metal layer are arranged, the stress can be removed, the toughness can be increased, and the tube blasting phenomenon at the low temperature and the high temperature can be reduced.

Description

technical field [0001] The invention relates to the technical field of solar heat collecting tubes, in particular to a high-efficiency and long-life solar heat collecting tube. Background technique [0002] The existing solar heat pipe is a double-layer structure, which includes an inner tube and an outer tube. The working principle of the water heater is to use the heat collecting tube to absorb the heat of sunlight and transfer it to the heat transfer medium. The traditional heat collecting tube is a cup-shaped structure made of double-layer glass, which includes an inner tube and an outer tube, and there is a vacuum between the inner and outer tubes. , the inner tube is coated with a selective absorption layer, and the space inside the inner tube is a space for storing heat transfer medium. In the current solar heat pipe structure, the solar heat pipe consists of the outermost vacuum glass tube and the innermost aluminum The alloy heat-absorbing plate and the heat-conduc...

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Problems solved by technology

[0002] The existing solar heat pipe is a double-layer structure, which includes an inner tube and an outer tube. The working principle of the water heater is to use the heat collecting tube to absorb the heat of sunlight and transfer it to the heat transfer medium. The traditional heat collecting tube is a cup-shaped structure made of double-layer glass, which includes an inner tube and an outer tube, and there is a vacuum between the inner and outer tubes. , the inner tube is coated with a selective absorption layer, and the space inside the inner tube is a space for storing heat transfer medium. In the current solar heat pipe structure, the solar heat pipe consists of the outermost vacuum glass tube and the innermost aluminum The alloy heat-absorbing plate and the heat-conducting copper tube in the middle layer are composed of three parts. The vacuum glass tube transmits sunlight to the aluminum alloy heat-absorbing plate and prevents the heat from spreading outward. The aluminum alloy heat-absorbing plate and the heat-conducting copper tube are separated from each other, and they are produced separately. The production time is long and there are many materials. When transferring heat, the aluminum alloy heat-absorbing plate and the heat-conducting copper tube are separated. The combination is not very tight, and the heat loss is more, which affects the heat transfer efficiency. The traditional solar vacuum heat collection tube has two big problems. First: while absorbing solar energy, as the temperature of the heat collection tube increases, The rise will also reflect a large amount of heat through infrared, resulting in a decrease in the efficiency of the heat collecting tube. Second: the heat collecting tube will burst at high and low temperatures. These problems need to be solved

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