Solar vacuum heat collecting pipe with double expansion joints

A technology of vacuum heat collecting tubes and expansion joints, which is applied in the field of heat collecting tubes of trough solar heat collectors and trough solar concentrators, can solve the problems of large heat absorbing parts, affecting life, and not easy to fix Reduce heat dissipation, improve utilization efficiency, and facilitate installation and fixation

Active Publication Date: 2017-02-22
SOUTHEAST UNIV
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AI-Extracted 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 a...
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Method used

[0023] The present invention is a heat collecting tube that is reasonably designed, can improve heat collecting efficiency, is convenient for fixing, is sturdy and durable, and is conducive to safe operation. The invention adopts the vacuum heat collecting tube with double expansion j...
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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.

Application Domain

Technology Topic

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  • Solar vacuum heat collecting pipe with double expansion joints
  • Solar vacuum heat collecting pipe with double expansion joints
  • Solar vacuum heat collecting pipe with double expansion joints

Examples

  • Experimental program(1)

Example Embodiment

[0020] The present invention will be further explained below in conjunction with the drawings.
[0021] Such as figure 1 , 2 , 3 and 4 show a trough-type double expansion joint vacuum heat collector tube, including glass tube 1, Kovar alloy tube 2, outer expansion joint 3, flange 4, inner expansion joint 5, support sleeve 6, suction tube Heat pipe 7, getter 8; the glass tube 1 and the Kovar alloy tube 2 are connected by welding, the Kovar alloy tube 2 and the outer expansion joint 3 are connected by welding, and the outer expansion joint 3 and flange 4 are connected by welding For connection, the flange 4 and the inner expansion joint 5 are connected by welding, the inner expansion joint 5 and the support sleeve 6 are connected by welding, the support sleeve 6 and the heat absorption tube 7 are connected by welding, and the getter 8 is placed in the vacuum tube.
[0022] The heat collection tube adopts an outer expansion joint 3 and an inner expansion joint 5, and both expansion joints are multi-layer expansion joints. The flange 4 has a fixing bolt hole 41 and a sealing groove 42, and the vacuum heat collecting tube and the tracking device are fixed by the flange 4. A vacuum is drawn between the glass tube 1 and the heat-absorbing tube 7, and the getter 8 is placed in the space, and is located in the Kovar tube 2 or the outer expansion joint 3 at the end, so that the sunlight will not be affected.
[0023] The invention is a heat collection tube with reasonable design, capable of improving heat collection efficiency, convenient fixation, sturdiness and durability, and beneficial to safe operation. The invention adopts the vacuum heat collection tube with double expansion joints, which can facilitate the installation and fixation of the vacuum heat collection tube, reduce the failure rate of the fusion seal between the glass tube and the Kovar alloy tube, can improve the heat collection efficiency, and is beneficial to the safe operation of the heat collection tube.
[0024] It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All the components that are not clear in this embodiment can be implemented with existing technology.
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Description & Claims & Application Information

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