Heat transfer tube for heat exchanger, heat exchanger, refrigerating cycle apparatus, and air conditioner

Abstract

To obtain a heat transfer tube for a heat exchanger or the like which can obtain predetermined heat transfer performance without increasing in-tube pressure loss. High ridges 22 A having 10 to 20 rows with a predetermined height and low ridges 22 B with a height lower than the high ridges 22 A having 2 to 6 rows between the high ridges 22 A and the high ridges 22 A are provided on an inner face helically with respect to a tube axial direction.

1 . A heat transfer tube for a heat exchanger, wherein
 high ridges formed with a predetermined height in ten to twenty rows and low ridges formed with a height lower than said high ridges in two to six rows between said high ridge and said high ridge are provided on an inner face of the tube, spirally with respect to a tube axial direction.   
     
     
         2 . The heat transfer tube for the heat exchanger of  claim 1 , wherein
 a difference in height between said high ridges and said low ridges is 0.04 mm or more.   
     
     
         3 . A heat exchanger, wherein
 a plurality of fins for expanding an area for heat exchange and   the heat transfer tube of  claim 1  are joined by pressurizing and performing tube expansion from an inner face side of said heat transfer tube.   
     
     
         4 . The heat exchanger of  claim 3 , wherein heights in said high ridges after tube expansion of said heat transfer tube are 0.10 to 0.26 mm. 
     
     
         5 . The heat exchanger of  claim 3 , wherein a width of a distal end portion of said high ridge after tube expansion of said heat transfer tube is 0.035 to 0.05 mm and a width of a distal end portion of said low ridge is 0.03 to 0.035 mm. 
     
     
         6 . The heat exchanger of  claim 3 ,
 wherein an apex angle of said high ridge is formed to be 15 to 30 degrees and an apex angle of said low ridge to be 5 to 15 degrees.   
     
     
         7 . A refrigerating cycle apparatus constituting a refrigerant circuit in which a compressor for compressing a refrigerant, a condenser for condensing said refrigerant by heat exchange, expanding means for decompressing the condensed refrigerant, and an evaporator for evaporating said decompressed refrigerant by heat exchange are connected by piping for circulating said refrigerant, wherein
 the heat exchanger of  claim 3  is said condenser and/or evaporator.   
     
     
         8 . The refrigerating cycle apparatus of  claim 7 , wherein as said refrigerant, any of an HC single refrigerant, a mixed refrigerant containing the HC, R32, R410A, R407C, tetrafluoropropene, or carbon dioxide is used. 
     
     
         9 . An air conditioner, wherein
 cooling/heating of a target space is performed by the refrigerating cycle apparatus of  claim 7 .   
     
     
         10 . A heat exchanger, wherein
 a plurality of fins for expanding an area for heat exchange and   the heat transfer tube of  claim 2  are joined by pressurizing and performing tube expansion from an inner face side of said heat transfer tube.   
     
     
         11 . The heat exchanger of  claim 4 , wherein a width of a distal end portion of said high ridge after tube expansion of said heat transfer tube is 0.035 to 0.05 mm and a width of a distal end portion of said low ridge is 0.03 to 0.035 mm. 
     
     
         12 . The heat exchanger of  claim 4 , wherein an apex angle of said high ridge is formed to be 15 to 30 degrees and an apex angle of said low ridge to be 5 to 15 degrees. 
     
     
         13 . The heat exchanger of  claim 5 , wherein an apex angle of said high ridge is formed to be 15 to 30 degrees and an apex angle of said low ridge to be 5 to 15 degrees. 
     
     
         14 . A refrigerating cycle apparatus constituting a refrigerant circuit in which a compressor for compressing a refrigerant, a condenser for condensing said refrigerant by heat exchange, expanding means for decompressing the condensed refrigerant, and an evaporator for evaporating said decompressed refrigerant by heat exchange are connected by piping for circulating said refrigerant, wherein
 the heat exchanger of  claim 4  is said condenser and/or evaporator.   
     
     
         15 . A refrigerating cycle apparatus constituting a refrigerant circuit in which a compressor for compressing a refrigerant, a condenser for condensing said refrigerant by heat exchange, expanding means for decompressing the condensed refrigerant, and an evaporator for evaporating said decompressed refrigerant by heat exchange are connected by piping for circulating said refrigerant, wherein
 the heat exchanger of  claim 5  is said condenser and/or evaporator.   
     
     
         16 . A refrigerating cycle apparatus constituting a refrigerant circuit in which a compressor for compressing a refrigerant, a condenser for condensing said refrigerant by heat exchange, expanding means for decompressing the condensed refrigerant, and an evaporator for evaporating said decompressed refrigerant by heat exchange are connected by piping for circulating said refrigerant, wherein
 the heat exchanger of  claim 6  is said condenser and/or evaporator.   
     
     
         17 . An air conditioner, wherein
 cooling/heating of a target space is performed by the refrigerating cycle apparatus of  claim 8 .