Copper aluminum composite pipe connecting pipe

Abstract

The invention relates to a copper aluminum composite pipe connecting pipe. The copper aluminum composite pipe connecting pipe comprises a copper aluminum composite pipe section; the inner side of thecopper aluminum composite pipe section is an aluminum layer; the outer side of the copper aluminum composite pipe section is covered with a copper layer; the two ends of the copper aluminum compositepipe are connected with copper pipe sections with the same pipe diameter; the copper aluminum composite pipe section is in weldless connection with the copper pipe sections at the two ends; the outerlayer copper material layer of the copper aluminum composite pipe section extends to part of copper material layers of the copper pipe sections at the two ends without welding seams; the contact surface of the copper materials in the copper pipe sections and the inner layer aluminum material of the copper aluminum composite pipe is a metal bond binding and fusion surface among copper aluminum atoms; through application of the technical scheme, the influence on the sealing property of the connecting pipe by leakage at the welding seam caused by electrochemical corrosion generated during weldingconnection between different metal material pipe sections of the connecting pipe can be avoided, the mechanical property of the fusion surface can be improved, damage to the fusion surface during bending is avoided, and the effect of prolonging the service life is achieved.

Description

technical field [0001] The invention relates to the field of connecting pipes for indoor and outdoor units of an air conditioner, in particular to a copper-aluminum composite pipe connecting pipe. Background technique [0002] The connecting pipes of indoor and outdoor units of air conditioners currently on the market have a copper-aluminum composite pipe whose middle section is covered with copper layer and aluminum layer inside, and the two ends are connected by copper-aluminum composite pipe with copper pipes connected by welding. Tube. [0003] The copper-aluminum composite pipe adopts a pipe surrounded by a layer of copper on the outside, and a pipe structure surrounded by an aluminum layer on the inside. The contact between the aluminum pipe and the copper pipe is an interatomic metal bonding layer, that is, It is said that the fusion between the aluminum tube and the copper tube contact surface is a combination of metal bonds. This fusion is equivalent to the mutual ...

AI Technical Summary

Problems solved by technology

[0006] Take the copper-aluminum composite pipe connecting pipe with copper pipes welded at both ends. First, there is a welding surface between the copper pipe and the copper-aluminum composite pipe. Due to the difference in welding materials, the welding surface, especially the outer welding surface, is in contact with the air in the air. Moisture and oxygen will cause galvanic corrosion, resulting in the defect of long-term use and leakage; secondly, there is also the defect that the main mechanical properties of the welded part are much lower than that of the rest of the pipeline, and it is not suitable for bending at the welded part

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