Horizontal type uniform-air-pressure pipe expansion device

Abstract

The invention provides a horizontal type uniform-air-pressure pipe expansion device which includes a workbench, a pipe expansion unit and a flaring unit. The pipe expansion unit is arranged on the workbench, and the flaring unit is arranged at the position, on one side of the pipe expansion unit, of the workbench; the pipe expansion unit includes a first base, a first mounting base, a nozzle and acompacting base, the first base is arranged on a bearing surface and is driven by a first driving unit to move in the axial direction of a heat dissipation pipe, the first mounting base is arranged on the first base, the nozzle is carried on the side, opposite to a pipe opening of the heat dissipation pipe, of the first mounting base, and the nozzle is driven by the first mounting base to achieveinsertion and extraction of the heat dissipation pipe; an inlet of the nozzle communicates with an outlet of an ultra-high pressure gas generator through a pipe; the compacting base is arranged on the side, close to the heat dissipation pipe, of the first mounting base; the compacting base is driven by a second driving unit to do reciprocating linear motion; a plurality of positioning holes are formed in the compacting base, a compacting sleeve is arranged in each positioning hole, and the compacting sleeves penetrate through the positioning holes to protrude out; and the inner walls of the compacting sleeves are provided with sealing pieces.

Description

technical field [0001] The invention relates to the technical field of tube expansion of finned heat exchangers, in particular to a horizontal air pressure uniform tube expansion device. Background technique [0002] Finned heat exchangers are generally composed of fins, radiating tubes densely distributed on the fins, and U-shaped tubes connected to adjacent radiating tubes. In order to improve the heat dissipation efficiency and stability of the finned heat exchanger, it is necessary to fully integrate the radiating tubes The fins are in contact to increase the heat exchange rate between the heat pipes and the fins. [0003] In order to achieve full contact between the heat dissipation tube and the fins, the tube wall of the heat dissipation tube is usually expanded radially by means of mechanical tube expansion, so that the heat dissipation tube forms a deformation zone and realizes expansion. [0004] Since the expansion tube mandrel in the mechanical expansion method i...

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Problems solved by technology

[0004] Since the expansion tube mandrel in the mechanical expansion method is in rigid contact with the inner wall of the heat dissipation tube, it is easy to cause damage to the inner wall of the heat dissipation tube, especially when the inner wall of the heat dissipation tube is processed into a threaded structure in order to increase the heat dissipation area, it is more likely to cause heat dissipation. The inner wall of the tube is damaged, which further increases the defective rate of the cooling tube

Moreover, during the mechanical expansion process, the wall thickness of the heat dissipation pipe will not become thinner with the expansion process. Therefore, when the diameter of the heat dissipation pipe increases, the length of the heat dissipation pipe will be compressed, that is, heat dissipation will occur. The phenomenon of tube shrinkage, the shrinkage rate is 3% to 5%, not only causes waste of materials, but also reduces the pass rate of fin heat exchangers

Furthermore, when mechanical tube expansion is used to complete the thermal tube expansion, it is necessary to use an expansion mandrel that is basically the same length as the thermal tube, which is not conducive to the expansion of thermal tubes of different specifications, and will increase the mechanical expansion device The overall size has higher requirements for the plant area

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