All-glass vacuum heat collection pipe with regular prism-shaped inner pipe and production method thereof

Abstract

An all-glass vacuum heat collection pipe with a regular prism-shaped inner pipe and a production method thereof belongs to the field of solar energy utilization devices and solves the problem that the full body type special-shaped inner pipe is difficult to process and produce. The all-glass vacuum heat collection pipe comprises a basic structure of the conventional all-glass vacuum heat collection pipe, wherein, the inner pipe (2) consists of a left section (7), a middle section (8) and a right section (9) which are mutually coaxially connected to a whole, the middle section (8) comprises a regular prism-shaped structure, and the left section (7) and the right section (9) are shaped like circular pipes. The production method comprises the steps of using a special discharge mold for drawing the axial full body type regular prism-shaped blank inner pipe, then carrying out reaming and circle-expanding on two ends for forming the left section (7) and the right section (9), fixing the size, discharging, trimming edges, firing mouths, carrying out round burning and sealing on the right section (9), plating a film, splicing with an outer pipe according to the conventional method and thelike, and the production must carry out annealing treatment in time. The all-glass vacuum heat collection pipe has the advantages that the all-glass vacuum heat collection pipe maximizes the surface area of a heat absorbing body and the heat exchange area energy of a heat transfer medium, minimizes the capacity energy of the inner pipe and realizes high strength; the all-glass vacuum heat collection pipe is based on the convention equipment and technology, thereby having low investment, low cost and high finished product ratio; and the all-glass vacuum heat collection pipe is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of solar energy utilization devices, and relates to an all-glass vacuum heat collecting tube with a positive prism inner tube and a manufacturing method thereof. Background technique [0002] At present, the all-glass vacuum solar collector tube used in solar water heaters is mainly composed of an outer tube and an inner tube, and the inner tube is mostly a smooth cylindrical tube, that is, the radial section of the inner tube is circular. Under a certain size of the outer tube, In view of the surface area and water capacity of the inner tube, as well as the influence of the light-receiving area and the vertical light-receiving area, its heat collection effect is not satisfactory and not very good; in order to further improve the heat collection effect of the inner tube, under a certain size of the outer tube, make it The surface area of ​​the heat absorbing body is maximized, the heat exchange area of ​​the heat tran...

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Problems solved by technology

[0002] At present, the all-glass vacuum solar collector tube used in solar water heaters is mainly composed of an outer tube and an inner tube, and the inner tube is mostly a smooth cylindrical tube, that is, the radial section of the inner tube is circular. Under a certain size of the outer tube, In view of the surface area and water capacity of the inner tube, as well as the influence of the light-receiving area and the vertical light-receiving area, its heat collection effect is not satisfactory and not very good; in order to further improve the heat collection effect of the inner tube, under a certain size of the outer tube, make it The surface area of ​​the heat absorbing body is maximized, the heat exchange area of ​​the heat transfer medium is maximized, and the volume of the inner tube is minimized. There have been special-shaped inner tube all-glass vacuum solar collector tubes provided by CN2781287Y, CN2442189Y and ZL200720103294·6, that is, the radial direction of the inner tube The cross-section is non-circular, which has the incomparable advantages of cylindrical tubes. Its disadvantage is that the inner tube is shaped in a whole body along the axial direction, that is, its radial non-circular cross-section is in a whole-body shape along the axial direction, so the following problems arise , in the processing and production, it is difficult to complete the blanking of the special-shaped inner tube, and it is more difficult to round and seal one end of it. The other end of the outer tube is also difficult to weld and assemble with one end of the outer tube to achieve annular sealing. Even if the annular sealing is completed, the wall thickness of the sealing line is uneven and easily damaged. product launch

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