Heat exchanger and tube for heat exchanger

Abstract

A heat exchanger and its tubes, wherein the heat exchanger includes a core 300 a, having a lamination of flat tubes 301 for flowing a refrigerant and corrugated fins 302, and tanks 310 having slots for insertion of the ends of tubes, the core is configured to have the flat surfaces of the tubes in parallel with the airflow direction, and the tubes have their ends 301 a twisted in the width direction by 90° with respect to the airflow direction. A heat exchanger for a supercritical refrigeration cycle has tanks 310 a, 310 c displaced in a direction orthogonal to the airflow direction on one side of plural cores 300 a, 300 b which are overlaid in the airflow direction, and an inlet 320 and an outlet 330 for the refrigerant are oriented toward the windward side or the downwind side of the airflow direction.

1 - 22 . (Canceled)  
   
   
       23 . A heat exchanger which is provided with plural rows of cores having lamination of flat tubes for flowing a refrigerant and corrugated fins, and tanks provided with slots for insertion of the ends of the tubes, and carries out heat exchange of the refrigerant by flowing air to the cores and transferring heat to the cores, wherein: 
 the tanks are formed of members having a hollow portion and the same cylindrical cross section and being provided with plural rows of slots,    the individual cores are configured to have the flat surfaces of the tubes in parallel with the airflow direction,    the tubes have the width direction of their ends twisted by 90° with respect to the airflow direction,    the slots are formed in plural positions in a straight line along the longitudinal direction of the tanks, and    the tubes are arranged to have large intervals among them relative to the width of the tubes.    
   
   
       24 . The heat exchanger according to  claim 23 , wherein a total of the inner diameters of the tanks is smaller than (the width of the tubes×the number of rows of cores).  
   
   
       25 . The heat exchanger according to  claim 23 , wherein when it is assumed that the interval between the arranged tubes is P and the width of the tubes is T, they have relationships P=(6 to 12) mm and T=P·(0.95 to 0.80).  
   
   
       26 . The heat exchanger according to  claim 23 , wherein the heat exchanger comprises a plurality of cores overlaid in the airflow direction.  
   
   
       27 . The heat exchanger according to  claim 26 , wherein: 
 the cores include a first core and a second core which are overlaid in the airflow direction,    the tanks include a first tank into which one end of each of the tubes of the first core is inserted, a second tank into which the other end of each of the tubes of the first core and one end of each of the tubes of the second core are inserted, and a third tank into which the other end of each of the tubes of the second core is inserted, and    an inlet for the refrigerant is formed on the first tank, and an outlet for the refrigerant is formed on the third tank.    
   
   
       28 . The heat exchanger according to  claim 27 , wherein the first tank and the third tank are displaced in a direction orthogonal to the airflow direction, and the inlet and the outlet are oriented toward the windward side or the downwind side of the airflow direction.  
   
   
       29 . The heat exchanger according to  claim 23 , wherein the fins are determined to have a width larger than that of the tubes.  
   
   
       30 . A heat exchanger which is provided with a core having lamination of flat tubes for flowing a refrigerant and corrugated fins, and tanks provided with slots for insertion of the ends of the tubes, and carries out heat exchange of the refrigerant by flowing air to the core and transferring heat to the core, wherein: 
 the tanks are cylindrical and configured by assembling a first member which is formed by extruding and in semitubular, a second member which has the slots arranged in a row and a square cross section, and a closing member for closing its ends, and    the tubes are formed to have the ends twisted in the width direction with respect to the airflow direction.    
   
   
       31 . The heat exchanger according to  claim 30 , wherein the tanks each is configured by assembling the first member, a plurality of the second members, a spacer for connecting the plural second members mutually and the closing member.  
   
   
       32 . The heat exchanger according to  claim 30 , wherein the closing member is provided with fitting portions for fitting the second member.  
   
   
       33 . The heat exchanger according to  claim 30 , wherein the first member is provided with caulking parts, and the first member and the second member are fixed by caulking the caulking parts.  
   
   
       34 . The heat exchanger according to  claim 33 , wherein the caulking parts are caulked to fix the first member, the second member and the closing member.  
   
   
       35 . The heat exchanger according to  claim 30 , wherein the ends of the tubes are inserted into the slots, then the first member and the second member are assembled.  
   
   
       36 . The heat exchanger according to  claim 30 , wherein the first member and the second member are assembled, then the ends of the tubes are inserted into the slots.  
   
   
       37 . The heat exchanger according to  claim 23 , wherein the ends of the tubes are bent with respect to the longitudinal direction of the tubes.  
   
   
       38 . The heat exchanger according to  claim 30 , wherein the ends of the tubes are bent with respect to the longitudinal direction of the tubes.  
   
   
       39 . The heat exchanger according to  claim 37 , wherein the ends of the tubes are bent before they are inserted into the slots.  
   
   
       40 . The heat exchanger according to  claim 38 , wherein the ends of the tubes are bent before they are inserted into the slots.  
   
   
       41 . The heat exchanger according to  claim 37 , wherein the ends of the tubes are bent after they are inserted into the slots.  
   
   
       42 . The heat exchanger according to  claim 38 , wherein the ends of the tubes are bent after they are inserted into the slots.  
   
   
       43 . The heat exchanger according to  claim 23 , wherein the heat exchanger is used for a refrigeration cycle which circulates the refrigerant, and the refrigeration cycle has a pressure on a high-pressure side exceeding the critical point of the refrigerant.  
   
   
       44 . The heat exchanger according to  claim 30 , wherein the heat exchanger is used for a refrigeration cycle which circulates the refrigerant, and the refrigeration cycle has a pressure on a high-pressure side exceeding the critical point of the refrigerant.