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Solar vacuum heat collecting pipe and production technique thereof

A technology of vacuum heat collecting tubes and solar energy, which is applied to solar heat collectors, parts of solar heat collectors, and solar thermal energy. To achieve the effect of improving the utilization rate of light and heat, improving the heat collection effect and overcoming the poor stability

Inactive Publication Date: 2016-11-16
芜湖市万里达新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deficiencies in the existing technology are: first, the glass outer tube has a light-transmitting effect, and some light is refracted and scattered, the light-gathering effect is poor, the solar energy utilization rate is low, and the light energy cannot be fully utilized; the second is that the mechanical strength is low, and the thermal expansion When the cold shrinks, it is easy to cause the tube to burst and shorten the service life; the third is that the vacuum degree of the interlayer is not high, and the use of evaporative getter increases the cost of use, and the ability to maintain the vacuum is poor, resulting in a decrease in the insulation effect

Method used

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  • Solar vacuum heat collecting pipe and production technique thereof

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Effect test

Embodiment 1

[0037] A method for producing solar vacuum heat collecting tubes, comprising the following steps:

[0038] (1) The inner and outer tubes are formed, and the sections of the inner and outer tubes are regular polygons, with a thickness of more than 2mm;

[0039] (2) The glass casing is formed, its section is a regular polygon, and its edge is polished into a convex lens;

[0040] (3) Sand blasting treatment, sandblasting the outer surface of the inner pipe to make the surface roughness Ra between 12.5, using 250 mesh quartz sand, and sandblasting the outer surface of the inner pipe at a speed of 1 cubic meter per minute deal with;

[0041] (4) cleaning treatment, cleaning and drying the inner and outer walls of the inner and outer pipes;

[0042] (5) coating, copper coating is carried out on the outer surface of the inner tube;

[0043] (6) Once assembled, the inner tube and the outer tube coated with the selective absorption coating are arranged coaxially in sequence;

[00...

Embodiment 2

[0059] A method for producing solar vacuum heat collecting tubes, comprising the following steps:

[0060] (1) The inner and outer tubes are formed, and the sections of the inner and outer tubes are regular polygons, with a thickness of more than 2mm;

[0061] (2) The glass casing is formed, its section is a regular polygon, and its edge is polished into a convex lens;

[0062] (3) Sand blasting treatment, sandblasting the outer surface of the inner pipe to make the surface roughness Ra between 18.5, using 320 mesh quartz sand, and sandblasting the outer surface of the inner pipe at a speed of 1 cubic meter per minute deal with;

[0063] (4) cleaning treatment, cleaning and drying the inner and outer walls of the inner and outer pipes;

[0064] (5) coating, copper coating is carried out on the outer surface of the inner tube;

[0065] (6) Once assembled, the inner tube and the outer tube coated with the selective absorption coating are arranged coaxially in sequence;

[00...

Embodiment 3

[0081] A method for producing solar vacuum heat collecting tubes, comprising the following steps:

[0082] (1) The inner and outer tubes are formed, and the sections of the inner and outer tubes are regular polygons, with a thickness of more than 2mm;

[0083] (2) The glass casing is formed, its section is a regular polygon, and its edge is polished into a convex lens;

[0084] (3) Sand blasting treatment, sandblasting the outer surface of the inner pipe to make the surface roughness Ra between 16, using 280 mesh quartz sand, and sandblasting the outer surface of the inner pipe at a speed of 1 cubic meter per minute deal with;

[0085] (4) cleaning treatment, cleaning and drying the inner and outer walls of the inner and outer pipes;

[0086] (5) coating, copper coating is carried out on the outer surface of the inner tube;

[0087] (6) Once assembled, the inner tube and the outer tube coated with the selective absorption coating are arranged coaxially in sequence;

[0088...

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Abstract

The invention discloses a solar vacuum heat collecting pipe which comprises a vacuum corrugated pipe. The solar vacuum heat collecting pipe is characterized in that the inner section and the outer section of the vacuum corrugated pipe are of a regular polygon structure; an included angle of 5-15 degrees is formed between the apothem of the inner regular polygon and the apothem of the outer regular polygon; and the outer wall of the inner side of the vacuum corrugated pipe is covered with a red copper film. A production method of the solar vacuum heat collecting pipe comprises the following steps of inner pipe formation and outer pipe formation, glass sleeve formation, abrasive blasting treatment, cleaning treatment, film coating, assembly for the first time, sealing for the first time, assembly for the second time, sealing for the second time, sealing for the third time and vacuum treatment. The utilization rate of the vacuum heat collecting pipe is increased, and the service life is prolonged.

Description

technical field [0001] The invention relates to the production field of vacuum heat collecting tubes, in particular to a solar vacuum heat collecting tube and a production process thereof. Background technique [0002] At present, in the domestic solar thermal utilization industry, the heat collection system with all-glass vacuum solar heat collector tube as the photothermal conversion device is the most widely used, and the selective absorption coating attached to the inner tube of the vacuum tube heat absorber is used to absorb the incident of solar radiation and convert it into heat. At present, the production enterprises of vacuum heat collecting tubes in the domestic solar energy industry usually use the production process of sealing the inner tube and the outer tube with the selective absorption coating in the production process of the vacuum tube, and then use exhaust equipment Through the tail pipe connected to the tail of the outer pipe, that is, the exhaust pipe, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/05F24J2/46C23C14/35C23C14/18C23C14/16F24S10/40
CPCC23C14/0036C23C14/165C23C14/185C23C14/352F24S10/40F24S80/00Y02E10/44
Inventor 滕忠文
Owner 芜湖市万里达新能源有限公司
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