Glass metal sealing device of intermediate temperature solar heat pipe receivers

Abstract

The invention relates to a glass-metal sealing device for a medium-temperature solar heat pipe receiver. The structure of the present invention is that the heat pipe passes through the center of the metal cover plate and is sealed and welded with the metal cover plate. In the vacuum layer, an annular cooling groove is opened on the outside of the metal cover plate, and the shielding cover is arranged outside the sealing place. The invention solves the defects of the sealing structure of the parabolic trough receiver that the expansion coefficients of the glass-metal sealing parts should be strictly matched, too many solder joints, poor reliability, difficult processing and high price. The invention can sealingly connect glass and metal whose expansion coefficients do not match. There is a cooling water tank on the cover plate. When the working temperature of the receiver is 400°C, the temperature of the sealing ring is still lower than 200°C, which prolongs the life of the sealing device and will not cause deformation. Different thermal stress is generated, no expansion joint is required, the structure is simple, the processing is convenient, and the cost is low.

Description

technical field [0001] The invention relates to a sealing device, in particular to a glass-metal sealing device for a medium-temperature solar heat pipe receiver. Background technique [0002] Using a parabolic trough concentrator to focus solar energy and generate high-temperature steam for power generation is a solar thermal power generation technology with a relatively simple structure and low technical difficulty. However, a key technology involved therein——the sealing and thermal expansion problems between the vacuum glass casing and the heat-absorbing tube have always hindered the wide application of this technology. [0003] Before the present invention, the sealing structure used in the existing parabolic trough receiver was a Kovar alloy and glass fusion sealing structure. As shown in Figure 5, a vacuum was drawn between the glass casing 6 and the heat-absorbing steel pipe 15, and the glass casing The two ends of 6 are welded with transition metal 16, the transitio...

AI Technical Summary

Problems solved by technology

However, a key technology involved in it-the sealing and thermal expansion between the vacuum glass sleeve and the heat absorbing tube has always hindered the wide application of this technology.

Therefore, the sealing structure used in such a parabolic trough receiver has the following disadvantages: ①The expansion coefficient of the glass-metal seal must be strictly matched; ②There are too many solder joints, which causes increased unreliability; ③It is difficult to process and expensive

The above-mentioned shortcomings have all affected the efficiency and popularization and application of the technology.

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