Processing technique of heat exchanger sheet

Abstract

The invention discloses a processing technique of a heat exchanger sheet, which comprises the following steps: (1) leveling the metal sheets for making the heat exchanger sheet; (2) overlapping two metal sheets, putting the two metal sheets on a working platform, compacting and flattening the two metal sheets by using a hold-down gear, and stitch-welding the two metal sheets according to the flow channel shape of the heat exchanger by using a laser welder head, wherein the reserved flow channel position is not welded; (3) after welding is completed, carrying out stress relieving on the stitch-welded metal sheets; (4) leveling the stitch-welded metal sheets; and (5) putting the leveled and stitch-welded metal sheets on a die, clamping the welding position or periphery of the welding position by using the die, reserving the gap for expansion on the die in the reserved flow channel position of the metal sheets, and introducing water or oil between the two metal sheets by using a hydraulic press to pressurize and maintain the pressure, so that the flow channel part expands outwards to form. The processing technique is simple and can be used for making a heat exchanger sheet from sheets.

Description

technical field [0001] The invention relates to a processing method of a plate heat exchanger, in particular to a processing method of a honeycomb heat exchanger plate. Background technique [0002] Plate heat exchangers, especially plate heat exchangers used in refrigeration equipment evaporators, are generally composed of two metal plates punched out of the flow channel and then welded. However, for the heat exchanger, the thicker the wall plate of the heat exchanger, the greater the heat transfer resistance and the lower the heat transfer efficiency. The thin plate is good for heat exchange, but the rigidity of the thin plate is poor, and the local high temperature will cause the deformation of the plate during welding. The deformation not only affects the appearance quality of the heat exchanger, but also easily leads to weak welding, especially for stainless steel with a thickness of 0.8mm to 1.5mm. Plates, in a format greater than 0.5m 2 The above deformation is larg...

AI Technical Summary

Problems solved by technology

However, for the heat exchanger, the thicker the wall plate of the heat exchanger, the greater the heat transfer resistance and the lower the heat transfer efficiency.

The thin plate is good for heat exchange, but the rigidity of the thin plate is poor, and the local high temperature will cause the deformation of the plate during welding. The deformation not only affects the appearance quality of the heat exchanger, but also easily causes weak welding, especially for stainless steel with a thickness of 0.8mm to 1.5mm. Plates, in a format greater than 0.5m 2 The above deformation is larger

Therefore, the traditional stamping and welding process is not suitable for making heat exchangers with stainless steel plates with a thickness of 0.8 mm to 1.5 mm.

[0003] In addition, when the steel plate is thinner, the strength will also decrease. When it is used in a heat exchanger, it is affected by the pressure of the medium, and when the flow channel is wider, it is easy to be deformed under pressure.

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