[China Aluminum Network] The invention of the “resistance-pressure welding method†for thin-walled copper-aluminum pipes has revolutionized the connection technology of air-conditioners and has become a sign of the complete maturity of copper-aluminum connecting pipe technology for air-conditioners. It has also become copper and aluminum. The connecting pipe enters the turning point of the third generation from the second generation. Since then, the third-generation copper-aluminum connecting pipe has not only been able to be used safely and efficiently in air conditioning, but also has a better overall effect than copper pipes.
According to Zhao Yue, senior engineer of the China Ocean University, who is responsible for the development of the third-generation copper-aluminum connecting pipe technology and obtained a national invention patent, the third-generation copper-aluminum connecting pipe has the following obvious advantages.
First, the welding technology advantages: suitable for industrial production of thin-walled copper and aluminum pipe welding technology, known as an important problem, is the key technology of air-conditioning connection tube aluminum replacement copper. Experts from the Ocean Science and Technology Research Institute of Ocean University of China and Qingdao Haiqing Machinery General Factory, after tens of thousands of repeated experiments, invented a completely new welding method in 2003—the resistance pressure welding method. This welding method can In the welding process, copper-aluminum eutectic structure and copper-aluminum atom combination are not realized in the weld seam, and the weld seam is very firm. After mechanical tests such as stretching, bending and flattening, no gap appears. As a result, the "air-conditioner copper-aluminum connecting pipe" technology has obtained national invention patents, and the copper-aluminum connecting pipe products have been jointly identified by the Ministry of Science and Technology, the Ministry of Commerce, the General Administration of Quality Supervision, Inspection and Quarantine, and the four ministries and commissions of the State Environmental Protection Administration as national key new products. At present, this invention is applying for international invention patents.
The third-generation copper-aluminum connecting pipe produced by this technology has higher weld strength than copper and aluminum pipes.
The second is the advantage of service life: From the perspective of the inner wall of the aluminum tube, since the refrigerant does not contain moisture, the corrosion of the inner wall of the copper-aluminum connection tube will not occur. The history of aluminum tubes used in China's refrigerator industry has been more than 20 years. Refrigerators using aluminum tubes have exceeded 100 million, and aluminum tubes that have been corroded from the inside to the outside have never been found. From the appearance of the copper-aluminum tube, its appearance uses a cross-linked polyethylene (shrinkable tube) for anti-corrosion treatment, the overall protection, to ensure the isolation of moisture and damp air corrosion of the aluminum tube, the life of more than 20 years. The copper pipe is not treated with anti-corrosion treatment. The appearance of the copper pipe is exposed. Certain corrosion phenomena may occur within 20 years. This indicates that the service life of the copper-aluminum connecting pipe is higher than that of the copper pipe.
The third is energy-saving advantages: the connection between the indoor unit and the outdoor unit of the air conditioner. The lower the heat transfer efficiency, the more energy-efficient, or the better the insulation effect, the more energy-efficient. Regardless of whether a copper pipe or an aluminum pipe is used as a connecting pipe, an insulating sleeve is sheathed in the metal pipe. The main function of this layer of the sleeve is to increase the heat insulation effect so as to reduce the loss of the cooling capacity caused by the connecting pipe. The thermal conductivity coefficient of copper is 1.8 times that of aluminum. Therefore, the use of a copper-aluminum connection pipe will facilitate the insulation of the connection pipe, reduce the waste of cooling capacity, and increase the energy saving level.
In addition, there is a layer of cross-linked polyethylene pipe for preventing corrosion on the exterior, and the heat insulation effect is further increased. Therefore, the heat dissipation of the copper-aluminum connecting pipe is much smaller than that of the copper pipe, which has the advantage of energy saving.
Fourth, excellent bending performance, easy installation and transfer. The aluminum pipe is softer than the copper pipe, and the design wall thickness of the aluminum pipe of the copper-aluminum connection pipe is 1.5 times that of the copper pipe. Not only the strength is ensured, but also relative to the all-copper connection pipe, it is easier to install and move the machine; if only by reducing the thickness of the copper pipe To reduce costs, such as the use of ≤ 0.6mm thick copper tubes, not only easy to fold flat, concave, but also easily affect the sealing effect between the connecting pipe and the internal and external machines, leaks, affect the cooling effect of air conditioners, and even lead to the end of the copper tube . Therefore, the installation performance of the copper-aluminum connection pipe is significantly better than that of the all-copper connection pipe. Due to the close relationship between the cooling effect of the air conditioner and the installation quality, the air conditioner using the copper-aluminum connecting pipe is easier to install and the cooling effect is more secure.
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