A kind of solar vacuum heat collecting tube with double expansion joints

Abstract

The invention discloses a solar vacuum heat collecting pipe with double expansion joints. The solar vacuum heat collecting pipe comprises the inner expansion joint, the outer expansion joint, a kovar alloy pipe, a glass pipe, a heat absorbing pipe, a supporting casing pipe, a flange and a degasser. The glass pipe and the kovar alloy pipe are connected in a fusion seal manner. The kovar alloy pipe and the outer expansion joint are connected through welding. The outer expansion joint and the flange are connected through welding. The flange and the inner expansion joint are connected through welding. The inner expansion joint and the supporting casing pipe are connected through welding. The supporting casing pipe and the heat absorbing pipe are connected through welding. The inner expansion joint and the outer expansion joint are both multi-layer type expansion joints. A fixing bolt hole and a sealing groove are formed in the flange. A vacuum heat collecting pipe body and a tracking device are fixed through the flange. The degasser is located in the kovar alloy pipe located at the end portion. The heat collecting pipe is reasonable in design, capable of improving the heat collecting efficiency, convenient to fix, firm, durable and capable of more safely running.

Description

technical field [0001] The invention relates to a trough type solar heat collecting device, in particular to a heat collecting tube of a trough type solar concentrating heat collector, and belongs to the technical field of energy utilization. Background technique [0002] As a clean, non-polluting renewable energy source, solar energy is considered an important part of the world's energy strategy for its development and utilization. Solar thermal utilization is the most important way in solar energy utilization. The trough solar thermal utilization system mainly uses the trough parabolic concentrator to reflect sunlight and gather it on the heat collecting tube, and export the heat energy through the medium in the tube for utilization. It has a relatively high efficiency. High, large scale, easy to standardize and so on. [0003] Solar thermal power generation is a method to replace conventional energy sources, and it is one of the focuses of scientists and governments in v...

AI Technical Summary

Problems solved by technology

In the current internal expansion joint type and external expansion joint type vacuum heat collecting tube, the heat absorbing part of the heat absorbing tube covered by the end expansion joint is relatively large, and it is not easy to fix and easily broken, thus affecting the service life

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