Twisted tooth finned tube and finned tube heat exchange tube bundle

Abstract

The invention discloses a twisted tooth finned tube and a finned tube heat exchange tube bundle. The twisted tooth finned tube provided by the invention comprises a base tube part and a fin part, wherein the fin part comprises a substrate which is fixedly arranged on the outer wall along a preset path and is continuously formed, a plurality of twisted teeth which are connected to the substrate and outwards extend along the radial direction of a base tube, and a plurality of opening slots which are formed between every two adjacent twisted teeth along the direction of the preset path; the bottom ends of the twisted teeth are integrally connected with the substrate; the top ends of the twisted teeth are twisted by certain angles relative to the bottom ends of the twisted teeth. With the structure of the fin part, the finning ratio of the finned tube is greatly increased, and the manufacturing difficulty of the finned tube is reduced; moreover, the top ends of the twisted teeth are twisted by certain angles relative to the bottom ends of the twisted teeth, so that the disturbance and heat exchange of fins to air flow outside the tube are greatly enhanced; therefore the twisted tooth finned tube is excellent in enhanced heat exchange performance.

Description

technical field [0001] The invention relates to a finned tube, in particular to a twisted toothed finned tube and a finned tube heat exchange tube bundle. Background technique [0002] Annular finned tubes made of round tubes with additional annular fins are widely used in engineering heat exchange devices. Common annular finned tubes include spiral finned tubes and sleeved finned tubes. The spiral finned tube is formed by spirally winding strip-shaped metal fins on the surface of the base tube, and the sleeved finned tube is formed by unconnected annular fins arranged at a certain distance along the tube axis and connected with the base tube. Spiral finned tubes and sleeved finned tubes are easy to manufacture and have relatively large fins, which can significantly reduce the heat transfer resistance of the airflow side outside the tubes, so they are widely used in various airflow heat exchange devices. According to the basic principle of finned tube enhanced heat transfer...

AI Technical Summary

Problems solved by technology

This is mainly due to the fact that the sawtooth has a weak disturbance to the airflow outside the substrate tube, so the enhancement effect on the heat transfer capacity of the fin surface is poor.

Therefore, when compared under the same metal consumption of finned tubes, the enhanced heat transfer effect of this serrated spiral finned tube is very limited.

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