Tube penetration and expansion method for oval tubes

Abstract

The invention discloses a tube penetration and expansion method for oval tubes. An oval tube penetration and expansion device is adopted in the method, a baffle is adjusted to the position required by an expansion height through a ruler according to requirements of a processing drawing, a sliding support is adjusted to a corresponding position and is close to the baffle, a base plate is laid on the part, where a fin is arranged, of a work rack, an inner end plate of the fin is hung on the baffle, the baffle is adjoined to a fixed support and the sliding support, the fin is placed on the base plate and abuts against the baffle, then an outer end plate of the fin is mounted on the fin, and a copper tube is penetrated into the fin. The method is easy and convenient to operate, safe and reliable. It is guaranteed that the diagonal error of the fin can be controlled by 0.1%., tightness between the fin and the aluminum end plates can reach 100%, and the friction coefficient of the hole site of the oval fin and the oval copper tube can be controlled within 0.45%.

Description

technical field [0001] The invention relates to a tube expansion method for elliptical tube series. Background technique [0002] The elliptical tube heat exchanger has a small windward area and obvious energy-saving effect. The first country in the world to apply this technology is Japan's Mitsubishi Heavy Industries. Due to its compact structure, the φ8 elliptical tube heat exchanger independently developed by our company can greatly improve the energy efficiency ratio of the air conditioner. It is the first in China and has an international advanced level. The company already has two invention patents. Due to the ultra-thin shape of the aluminum foil fin of the elliptical tube, the deformation difference of the modified hole position, and the denaturation difference of the elliptical copper tube, copper exposure and diagonal deviation are prone to occur in the production process before improvement. Copper pipes are not easy to pass through, such as rework and copper was...

AI Technical Summary

Problems solved by technology

Due to the ultra-thin shape of the aluminum foil fins of the elliptical tube, the deformation difference of the modified hole position, and the denaturation difference of the elliptical copper tube, copper exposure and diagonal deviation are prone to occur in the production process before improvement

Copper pipes are not easy to pass through, such as rework and waste of copper materials, resulting in low efficiency

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