Inner-expanded-type solar vacuum heat-collecting pipe

A technology of trough solar energy and vacuum heat collecting tubes, which is applied in the direction of solar heat collectors, solar heat collector safety, and solar thermal energy. It can solve problems such as complex processes, difficulty in high temperature tolerance, and limited length, and achieve simplified installation and connection. Structure, satisfying high-power heat collection and maintaining long-term sealing effect

Inactive Publication Date: 2007-02-07
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that this kind of vacuum heat collecting tube with bellows as the inner tube is concentrated on the glass tube, obviously insufficient in strength and rigidity, limited in length, and has a large flow resistance, which cannot meet the

Method used

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  • Inner-expanded-type solar vacuum heat-collecting pipe
  • Inner-expanded-type solar vacuum heat-collecting pipe
  • Inner-expanded-type solar vacuum heat-collecting pipe

Examples

Experimental program
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Embodiment 1

[0017] The internal expansion tank type solar vacuum heat collecting tube of the present embodiment is as figure 1 As shown, the structure is that the glass tube 2 is set on the central metal tube 3, and a getter is placed in the tube to achieve and maintain a vacuum degree of 10-2 Pa in the tube to form a vacuum layer 6. The surface of the metal pipe is coated with a solar light absorbing coating 5 . The metal pipe 3 is split in the middle, and a wave expansion joint 7 is added for sealing welding, so as to compensate the expansion difference between the glass pipe 2 and the metal pipe 3 after the temperature rises. Self-centering supports 4 and 8 are respectively installed in the middle of the two sections of metal pipe 3, and its specific structure is as follows image 3 and Figure 4 As shown, the self-centering support is composed of an arc support seat 4-3, an elastic support piece 4-2, and a contact head 4-1. The arc radius of the arc support seat 4-3 matches the oute...

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Abstract

The invention relates to an internal expansion groove type solar vacuum heat collection tube, which belongs to the technical field of solar heat collection facilities. The vacuum heat collecting tube includes an outer glass tube, the glass tube is set on the metal tube in the middle, and the metal tube is coated with a heat-absorbing coating. The middle of the metal tube is broken and connected by a wave expansion joint. The alloy transition pieces are respectively sealed with the extended ends of the two sections of metal tubes, the glass tube, the metal tube and the corrugated expansion joint are vacuumed to form a vacuum layer, and the middle part of the metal tube and the glass tube are respectively equipped with self-centering supports . The invention internally digests the expansion of the metal tube larger than the glass tube, simplifies the installation and connection structure; at the same time, it has sufficient strength and rigidity, and is convenient for system installation and integration, and is especially suitable for high-temperature and high-power solar thermal power generation and other occasions.

Description

technical field [0001] The invention relates to a vacuum heat collection tube, in particular to a structural improvement of the vacuum heat collection tube used in a solar heat utilization system, and belongs to the technical field of solar heat collection facilities. Background technique [0002] The vacuum heat collector is the core device in the solar heat utilization system. The typical structure of the existing vacuum heat collecting tube is as described in Chinese Patent Application No. 95117947. The outer glass tube is set on the metal tube in the middle, and the two ends are sealed and connected. To prevent heat loss, the metal pipe is coated with a heat-absorbing coating to absorb the heat of the sun. The problem in the use of this type of heat collecting tube is: because the expansion coefficient of the metal tube is much larger than that of the glass tube, when the temperature is high, the expansion of the metal tube cannot be digested in the heat collecting tube...

Claims

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Application Information

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IPC IPC(8): F24J2/05F24S10/40
CPCY02E10/44F24S10/45F24S40/80
Inventor 王军张耀明刘德有
Owner HOHAI UNIV
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