Cooling requirements for copper tubes

At present, because red copper tube is widely used in air conditioning refrigeration and refrigerator refrigeration, the requirements of copper tube quality are more and more strict.

1. Copper pipe should have a certain strength and wall thickness, can withstand the pressure of refrigeration working medium (such as freon), prevent its leakage.

2. Copper pipe should have good metallographic structure and good comprehensive mechanical properties, no metallurgical defects (such as inclusion, porosity), and has the appropriate grain size, with good matching strength and plasticity, so as to smoothly withstand the bending, expanding and expanding in the manufacturing process of the two devices.

3. Copper pipe should have good welding performance. Welding performance is concerned with the chemical composition of copper tube above all, especially appropriate phosphorus, and surface condition, especially cleanliness, and the cleaning degree in the tube is also an important assurance of the safe operation of air conditioning machine.

4. Copper tubes should have good heat transfer performance. It does not refer to the thermal conductivity of the metal itself, but the heat transfer coefficient related to the pipe surface shape and copper pipe and air xi, inner thread copper pipe than light pipe heat transfer coefficient 2-3 times, collectively known as efficient heat transfer copper pipe.

The traditional copper tube production process (extrusion method) is made of continuous casting billet ingot extruded into tube billet, and then processed into pipe after cold rolling and drawing. Since the appearance of cast-rolling in the early 1990s, the cast-rolling method has been widely used in the production of copper pipes. The practice shows that the cast-rolling method has stable performance, low manufacturing cost, low energy consumption and high efficiency, which can meet the harsh requirements of air conditioning and refrigeration industry.