Solar heat collecting tube structure with external getter device

Abstract

The invention provides a solar heat collecting tube structure with an external getter device. The solar heat collecting tube structure comprises a stainless steel tube, a glass tube and the getter device which are arranged coaxially; the two ends of the glass tube are connected with metal joints correspondingly in an axial fusion manner, the metal joints are welded with elastic expansion joints, the elastic expansion joints are welded with metal rings, and the metal rings are welded with the stainless steel tube, a chamber between the stainless steel tube and the glass tube is then formed, andthe metal joints are radially provided with a guide pipe communicating the chamber; the getter device is coaxially arranged at the outer side of the glass tube and is provided with an annular cavityformed by an inner wall and an outer wall, one end of the annular cavity is closed, the other end is provided with a sealing head, the tail end of the sealing head is provided with a snap ring, getteris arranged in the annular cavity and is limited by the snap ring; and the inner wall and the outer wall of the getter device are provided with holes at corresponding positions correspondingly, the holes on the inner wall of the getter device are connected with the guide pipe on the metal joints, and the holes on the outer wall of the getter device are connected with a tail connecting pipe. The solar heat collecting tube structure with the external getter device can improve the performance and reliability of a heat collecting tube, is easy to disassemble and has shorter exhaust time.

Description

technical field [0001] The invention relates to a solar heat collecting tube structure with an external getter device, which is particularly suitable for the technical requirements of solar thermal power generation using heat conducting oil, molten salt and DSC heat conducting medium. Background technique [0002] The solar collector tube is the core component of solar thermal power generation technology. The trough collector or Fresnel collector gathers sunlight to the collector tube through a linear reflector, and exchanges heat through the medium flowing in the tube of the collector tube. The medium heats water to generate water vapor or directly generates water vapor to drive a steam turbine to generate electricity. Typical solar collector tubes use concentric stainless steel tubes and glass tubes as the inner and outer tubes respectively. The outer wall of the stainless steel tube is generally coated with a heat-absorbing coating to improve the heat absorption efficienc...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the prior art that the temperature of the getter is too high, the defect of the glass tail pipe, and the failure caused by the focusing and heating of the end of the heat collecting tube by the mirror, the purpose of the present invention is to provide an external getter device. Solar heat collector tube structure, the heat collector tube structure has good vacuum maintenance performance, light concentration and heat collection performance and weather resistance

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