Manufacturing method of medium temperature heat pipe heat collecting pipe for solar energy internal concentration

Abstract

The invention relates to a solar inner-condensation moderate temperature heat pipe heat collecting tube and a manufacturing method of the solar inner-condensation moderate temperature heat pipe heat collecting tube. The solar inner-condensation moderate temperature heat pipe heat collecting tube comprises an outer cover tube made of light-transmitting materials, a vacuum cover tube coaxial with the outer cover tube, a heat absorbing tube, a condensation plate arranged between the outer cover tube and the vacuum cover tube, an upper end cover, a lower end cover and a radiating end tube. The upper end cover and the lower end cover are packaged at the two ends of the outer cover tube respectively. The radiating end tube and the heat energy output end of the heat absorbing tube are connected into a whole in a sealing mode, so that a glass heat tube is formed. A vacuum layer is formed by the vacuum cover tube and the heat absorbing tube. The condensation plate is assembled between the outer cover tube and the vacuum cover tube, so that an annular heating cavity is formed. The solar inner-condensation moderate temperature heat pipe heat collecting tube is rapid in manufacturing, high in heat collecting efficiency, and high in heat transfer speed and is an ideal solar inner-condensation moderate temperature heat pipe heat collecting tube capable of converting solar energy into a moderate temperature heat source.

Description

technical field [0001] The invention relates to a method for manufacturing a heat collecting tube of a medium-temperature heat pipe for internally concentrating solar energy. Background technique [0002] At present, there are mainly two types of heat collecting tubes used for solar energy. One is an all-glass vacuum heat collecting tube. One end of the tube is a blind end, and the other end is an open end connected to the collector. This type of heat collecting tube uses water as the heat transfer medium. . The other is the glass double vacuum heat pipe, both ends of which are blind ends. It uses a heat transfer medium as the heat conduction medium of the solar collector tube. These two types of heat collecting tubes have been widely used in solar water heaters. In order to further improve the heat collection temperature and scope of application of solar heat collector tubes, a Chinese patent document disclosed a technical solution on November 15, 2006 with the applicatio...

AI Technical Summary

Problems solved by technology

Although this kind of technical scheme can effectively increase the thermal efficiency of absorbing solar energy through the reflector, the patent still has the following technical defects: 1. Because the focal axis of the reflector, the heat-absorbing tube and the outer cover tube are not the central axis Overlap structure

Therefore, it not only increases the difficulty of processing and assembling the heat collecting tube

In particular, the reflector adopts a double-paraboloid or paraboloid non-tracking structure, which causes a part of the focal axis of the reflector to separate from the surface of the heat-absorbing tube within a certain period of time, which reduces the heat-absorbing efficiency.

2. The heat-absorbing tube of this scheme is made of borosilicate glass. When the heat-absorbing tube made of this material is impacted by medium-high temperature and low temperature, it is easy to burst the tube and leak heat medium, causing the system to fail.

Although this technical solution can effectively increase the thermal efficiency of absorbing solar energy through the reflector, the patent still has the following technical defects: 1. Since the ratio of the inner diameter of the heat absorbing tube to the cover tube is 3-5 times, the diameter of the outer tube is reduced When stretching, the wall of the outer tube end becomes thinner, and the air tightness and strength decrease accordingly

This can also cause annealing deformation of the reflector, causing partial failure of the reflector, increasing the difficulty of processing and assembling the heat collecting tube, and reducing the heat absorption efficiency

2. The heat-absorbing tube of this scheme is made of borosilicate glass, and the high-temperature medium exists in the metal heat conductor, and there is an air heat-resisting layer between the two, which reduces the heat-absorbing performance

3. When the metal thermal energy conductor is connected to the heat collector, it is connected with a screw or flange gasket structure, which may increase the number of possible leakage points, which is not conducive to the use of large-scale projects

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