Outer fin heat exchange tube with spiral inner core and manufacturing method of outer fin heat exchange tube

Abstract

The invention provides an outer fin heat exchange tube with a spiral inner core, and relates to the technical field of heat exchange. The manufacturing method comprises the following steps of S1, acquiring the spiral inner core: (1) processing into a longitudinal fin profile by adopting a hot extrusion way; and (2) applying rotational torque to the profile extruded at a constant speed through a rotation-shearing tool according to a rotational speed corresponding to a designed screw pitch while the profile is relatively hot and easy to deform, so that a longitudinal fin is spirally deformed toobtain the spiral inner core; S2, compounding the spiral inner core and a base tube: (1) obtaining a cored base tube by a thermal expansion and cold contraction or rolling compounding method; and S3,compounding the cored base tube and an outer fin sleeve: (1) manufacturing an outer sleeve by adopting a hot extrusion way; (2) performing contact-type inserting of the cored base tube in the outer sleeve when the outer sleeve is relatively hot and the internal diameter of the outer sleeve is relatively large, and compounding the outer sleeve and the cored base tube when the outer sleeve is subjected to thermal expansion and cold contraction; and (3), extruding the outer fin on the outer sleeve to manufacture the outer fin heat exchange tube with the spiral inner core. The outer fin heat exchange tube with the spiral inner core overcomes the defects that in the prior art, the length of a corrugated inner fin of a heat exchange tube is limited, trash needs to be cleaned in soldering, the production cost is high, the cycle is long, and the application range is limited.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to an outer-fin heat exchange tube with a spiral inner core and a manufacturing method thereof. Background technique [0002] Finned heat exchange tubes have been widely used in various types of heat exchange equipment and heating equipment. It mainly increases the outer surface area (or inner surface area) of the heat exchange tube by adding fins on the surface of the heat exchange tube, so as to improve purpose of heat transfer efficiency. [0003] Finned tubes used in heat exchangers are roughly divided into two types in terms of structure: one is outer finned tubes, and the other is inner finned tubes, both of which are used to realize heat exchange inside and outside the pipe. At present, there are inner fin-enhanced heat exchange tubes at home and abroad. The inner fins are generally processed into corrugated inner fins through tin-plated thin copper coils (W≤1300mm), a...

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention is to provide a manufacturing method of an outer-finned heat exchange tube with a spiral inner core in view of the defects and deficiencies of the prior art, which solves the problem that the heat exchange tube is limited by the width of the inner fin coil in the prior art. Restrictions, and the difficulty of cleaning the compound residue between the inner fin and the base tube, resulting in high cost and limited application of heat exchange tubes

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