Refrigerant tube for heat exchangers

Abstract

A refrigerant tube for heat exchangers is disclosed. The refrigerant tube has an outer diameter of not larger than 5.3 mm, with a plurality of internal spiral fins formed on the inner surface of the refrigerant tube. The refrigerant tube has a thickness of 0.16 mm˜0.2 mm. The internal spiral fins are set in their number to 40˜50, and each have a height of 0.15 mm˜0.18 mm, a projection angle of 38°˜42°, and a spiral angle of 6°˜20°. Due to the internal spiral fins in addition to the reduced outer diameter of the refrigerant tube, the tube reduces the production cost of heat exchangers and accomplishes the recent trend of compactness of the heat exchangers. The tube also has several advantages expected from small-diameter refrigerant tubes, such as a reduction in air-side pressure loss, and improves heat transfer efficiency of the heat exchangers. This refrigerant tube thus enhances the heat exchange operational performance of the heat exchangers.

What is claimed is:  
     
         1 . A refrigerant tube assembled with a plurality of air guide fins in a heat exchanger, wherein said refrigerant tube has an outer diameter of not larger than 5.3 mm, with a plurality of internal spiral fins formed on an inner surface of said refrigerant tube.  
     
     
         2 . The refrigerant tube according to  claim 1 , wherein a thickness of said refrigerant tube is set to 0.16 mm˜0.2 mm.  
     
     
         3 . The refrigerant tube according to  claim 1 , wherein said internal spiral fins are set in their number to 40˜50, and each have a height of 0.15 mm˜0.18 mm, a projection angle of 38°˜42°, and a spiral angle of 6°˜20°.  
     
     
         4 . The refrigerant tube according to  claim 3 , wherein said spiral angle of the internal spiral fins is set to 6°˜10°.  
     
     
         5 . The refrigerant tube according to  claim 3 , wherein said spiral angle of the internal spiral fins is set to 16°˜20°.