Manufacture method of multiple straight fin heat exchange tube

Abstract

The invention discloses a manufacturing method of a multi-straight-fin heat exchange tube, which is characterized by comprising the steps of: (1) sizing the shape of outer straight fins of a base tube; (2) welding the outer straight fins of the base tube, namely, putting a half-finished work piece on a special working rack, arranging a plug provided with a water inlet tube, a water outlet tube and a valve at two ends of the work piece, connecting the water inlet tube and the water outlet tube, inletting circulating cooling water, welding a first pair of straight fins in a two-side level and matching welding manner, turning the tube for 90 degrees after finishing the welding of the first pair of straight fins, welding a second pair of straight fins and welding other straight fins with the same method; (3) straightening the tube; (4) processing the outer appearance of the tube; (5) examining the tube. The manufacturing method of the multi-straight fin heat exchange tube has simple manufacturing technique and low labor intensity, avoids the situation of the serious deformation and twisting of the base tube and fins in the manufacturing process of the heat exchange tube and improves the quality of the multi-straight-fin heat exchange tube.

Description

technical field [0001] The invention relates to a method for manufacturing a plurality of straight-fin heat exchange tubes used in metallurgy and electric power, especially in large-scale heating and heat exchange equipment in the petrochemical industry. Background technique [0002] As early as the 1980s, double straight fin finned tubes appeared, and the industry standard was regulated in the early 1990s: JB / T5255-91. Finned tubes are two straight fins welded on a base tube, and the length of the base tube is generally not more than 10 meters, which is limited to the boiler industry. Because it welds two straight fins, it cannot increase the effective heat exchange area to the greatest extent, and its application field is greatly limited. At present, in the metallurgy, electric power and petrochemical industries, a large number of ultra-long and multi-straight finned tubes are required for heating and exchanging heat of media and fluids. The heat exchange area has increa...

AI Technical Summary

Problems solved by technology

However, in the manufacturing process of ultra-long and multi-straight fin heat exchange tubes, several straight fins must be welded on a base tube, and the internal and external stress of thermal expansion and contraction due to welding will cause the base tube and straight fins to Severe deformation and distortion, thus failing to meet the design requirements of the product and scrapping

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