Female screw heat-transfer pipe

Abstract

A heat conduction tube of internal thread type is prepared for forming said heat conduction tube by aluminum or aluminum alloy material, setting multiple parallel-arranged tooth ribs with high tooth and low tooth being set alternatively at internal surface of heat conduction tube to increase area of internal surface on heat conduction tube as large as possible for raising heat exchange coefficient of heat conduction tube and for maintaining excellent heat exchange effect of heat conduction tube.

Description

technical field [0001] The invention relates to an internally threaded heat transfer tube, in particular to an aluminum and aluminum-based alloy seamless internally threaded heat transfer tube for air conditioning and refrigeration. Background technique [0002] Widely used in air-cooled condensers and evaporators of small and medium-sized Freon refrigeration and air-conditioning devices, most of them are finned tube cluster structures, and their structures are often copper tube aluminum sheets, copper tube copper sheets or steel pipe copper sheets. Among them, copper tubes and aluminum sheets are the most widely used because of their good heat transfer effect and easy processing. The most commonly used copper tubes for processing copper tubes and aluminum finned tube clusters are internally threaded copper tubes. The soaring copper price in the past two years has caused the increase in the manufacturing cost of air conditioners, refrigerators and other refrigeration equipme...

AI Technical Summary

Problems solved by technology

However, in the tube expansion process of ordinary internally threaded aluminum tubes in the process of heat exchanger processing, it is necessary to insert the mandrel and the expansion head into the heat transfer tube to expand the tubes, so that the internally threaded aluminum tubes and aluminum foil fins form an interference fit, Therefore, in this process, due to the strong extrusion between the mandrel and each tooth rib of the heat transfer tube, the tooth shape of the tooth rib is severely damaged, which not only reduces the effective heat exchange area, but also hinders the flow of refrigerant in each tooth rib. The flow between the ribs is not conducive to the formation of the Gregorian effect, so that the heat transfer performance of the heat transfer tube is significantly reduced

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