Refrigerant distributor, heat exchanger, and air-conditioning apparatus

Abstract

A refrigerant distributor includes: an outer tube to which a heat transfer tube is connected; and an inner tube accommodated in the outer tube and having a dispersion hole that allows refrigerant to flow to the outer tube. The inner tube has an inner wall on which a projection is formed to extend in an extending direction of the inner tube. A plurality of projections including the projection are formed on the inner wall of the inner tube and arranged in a circumferential direction of the inner tube.

1 . A refrigerant distributor comprising:
 an outer tube to which a heat transfer tube is connected; and   an inner tube accommodated in the outer tube and having a dispersion hole that allows refrigerant to flow to the outer tube,   wherein an angle φ from a vertical line that extends from a center of the inner tube to a line that extends to the dispersion hole is set to satisfy the following formulas (1) and (2):   
       
         
           
             
               
                 
                   
                     
                       θ 
                       - 
                       20 
                     
                     < 
                     φ 
                     < 
                     180 
                   
                 
                 
                   
                     ( 
                     1 
                     ) 
                   
                 
               
             
           
         
         
           
             
               
                 
                   
                     α 
                     = 
                     
                       1 
                       - 
                       
                         θ 
                         / 
                         180 
                       
                       + 
                       
                         sin 
                         ⁢ 
                         θcosθ 
                         / 
                         π 
                       
                     
                   
                 
                 
                   
                     ( 
                     2 
                     ) 
                   
                 
               
             
           
         
         where θ is an estimated liquid level angle, and α is a void fraction. 
       
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . A refrigerant distributor comprising:
 an outer tube to which a heat transfer tube is connected; and   an inner tube accommodated in the outer tube and having a dispersion hole that allows refrigerant to flow to the outer tube,   wherein   the inner tube has an inner wall on which a projection is formed to extend in an extending direction of the inner tube,   a plurality of projections including the projection are formed on the inner wall of the inner tube and arranged in a circumferential direction of the inner tube, and   the inner tube is provided on an upstream side in a flow of two-phase gas-liquid refrigerant, and has a projection formation portion in which the projection is formed and a smooth portion which is located downstream of the projection formation portion in the flow of the two-phase gas-liquid refrigerant and in which the inner wall of the inner tube is smooth.   
     
     
         7 . A refrigerant distributor comprising:
 an outer tube to which a heat transfer tube is connected; and   an inner tube accommodated in the outer tube and having a dispersion hole that allows refrigerant to flow to the outer tube,   wherein   the inner tube has an inner wall on which a projection is formed to extend in an extending direction of the inner tube,   a plurality of projections including the projection are formed on the inner wall of the inner tube and arranged in a circumferential direction of the inner tube, and   the inner tube is provided on an upstream side in a flow of two-phase gas-liquid refrigerant, and has a smooth portion in which the inner wall of the inner tube is smooth and a projection formation portion which is located downward of the smooth portion in the flow of the two-phase gas-liquid refrigerant and in which the projection is provided.   
     
     
         8 . (canceled) 
     
     
         9 . (canceled) 
     
     
         10 . The refrigerant distributor of  claim 1 , wherein
 the inner tube has an inner wall on which a projection is formed to extend in an extending direction of the inner tube, and   a plurality of projections including the projection are formed on the inner wall of the inner tube and arranged in a circumferential direction of the inner tube.   
     
     
         11 . The refrigerant distributor of  claim 10 , wherein the projection is formed to helically extend in the extending direction of the inner tube. 
     
     
         12 . The refrigerant distributor of  claim 10 , wherein the projection is formed to extend in a direction inclined to the extending direction of the inner tube. 
     
     
         13 . The refrigerant distributor of  claim 10 , wherein part of the projection that is located on a downstream side in a flow of two-phase gas-liquid refrigerant has a greater height than a height of part of the projection that is located on an upstream side in the flow of the two-phase gas-liquid refrigerant. 
     
     
         14 . A heat exchanger comprising the refrigerant distributor of  claim 1 . 
     
     
         15 . An air-conditioning apparatus comprising the heat exchanger of  claim 14 .