Method for manufacturing flat tubes

Abstract

The invention relates to a method for manufacturing flat tubes. The method includes a coarse pressing forming phase, a dimensional fine pressing phase, a shell nosing phase and a welding sealing phase. Rolling is carried out by progressive dies of a plate pressing machine in the coarse pressing forming phase and the dimensional fine pressing phase, progressive drawing die sets are mounted on the plate pressing machine, at least three roller groups are arranged in each progressive drawing die set and synchronously rotate on the plate pressing machine in a linkage manner, each roller group comprises an upper roller and a lower roller which are oppositely arranged in the up-down direction, the upper rollers are provided with conical bosses which outwardly extend, radially inward conical grooves which are matched with the upper rollers are formed in the lower rollers, roller gaps for pressing and forming metal sheets are reserved between the conical bosses and the conical grooves, and pressures which are applied by the upper rollers and the lower rollers on the central metal sheets are 0.5-5 KG. The method has the advantages that the plate pressing machine coarsely presses and finely presses the metal sheets, then the metal sheets are formed by the aid of shell nosing working procedures and high-frequency welding, and accordingly the flat tubes can be quickly formed.

Description

technical field [0001] The invention relates to a heat collecting tube in the field of solar heat collectors, in particular to a method for manufacturing a flat tube. Background technique [0002] Most of the existing heat collectors use cylindrical heat collecting tubes or spiral heat collecting tubes, such as the Chinese invention patent "New Heat Collecting Tube" with application number 201210426411.8, the heat collecting tubes include glass inner tubes and glass outer tubes, glass inner tubes and glass There is a vacuum layer between the outer tubes, and the glass inner tube adopts a spiral tube. Or if the PCT with the application number 201380040165.5 introduces the domestic invention patent "solar heat collector tube", the central metal tube and the central tube socketed on it are used to absorb the thermal expansion difference between the central metal tube and the glass tube through the absorption device, and the metal tube and glass tubes are cylindrical tubes. ...

AI Technical Summary

Problems solved by technology

[0003] However, according to the applicant's understanding, the existing absorbing surface of the heat collecting tube is difficult to fully absorb light, and its absorption efficiency is low, and the heat collector formed by the heat collecting tube is large in size, requires a large footprint, and has an unattractive appearance.

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