Pipe connection used for indoor and outdoor units of air conditioner and its method for making production method

Abstract

The invention relates to a connection tube applied to the indoor machine and outdoor machine of an air conditioner and a manufacture method thereof. A taper face of weld is arranged at the joint welding position of a copper pipe, and raised grains are arranged on the outer wall of an aluminum pipe. During welding, a mosaic block is arranged at the welding position of the fixed electrode; a grooveis arranged in the mosaic block, raised grains are prepared on the groove; and the nominal diameter of the groove which bears raised grains is identical with the outer diameter of the aluminum pipe. The aluminum fluid melted during welding can be filled in the raised grains of the groove of the mosaic block, so that the deformation of the aluminum pipe is avoided, and the quality and strength of the product are improved. By such welding method, the aluminum pipe can be clamped to avoid breaking off; in addition, the outer diameter of the welding position of the copper-aluminum pipe joint is kept identical with the outer diameter of the aluminum pipe.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to the improvement of connecting pipes used for indoor and outdoor units of air conditioners. Background technique [0002] In recent years, the price of copper has continued to rise, and the wall thickness of copper tubes designed in refrigeration products has become thinner and thinner. With the depletion of global copper resources, simply thinning the wall thickness of copper can no longer offset the soaring copper price, and the replacement of copper with aluminum has become a problem that the refrigeration industry has to face. Facts have proved that copper tubes at both ends are an alternative to aluminum tubes, and the first choice for aluminum instead of copper in the refrigeration industry. [0003] Refrigerant is the working substance of the refrigeration cycle in the refrigeration device. In the circulating pipeline system using refrigerant as the cooling medium...

AI Technical Summary

Problems solved by technology

In order to make the outer diameter of the welded joint the same as the outer diameter of the aluminum tube, the diameter of the groove that clamps the aluminum tube in the electrode needs to be the same as the outer diameter of the aluminum tube, but in this way the aluminum tube cannot be clamped, and the aluminum tube is easy to fall off

In practice, in order to ensure that the electrode can hold the aluminum tube, the minimum diameter of the groove that holds the aluminum tube in the electrode is usually designed to be a little smaller than the outer diameter of the aluminum tube, so the outer diameter of this part after welding is smaller than that to be welded Aluminum tubes, especially when welding thin-walled copper-aluminum tubes, too small a groove diameter design for clamping aluminum tubes will make the inner diameter of the welded joints become elliptical, the quality standard will be lowered, and the problem will become more prominent

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