L-type turn-fin tube and turn-fin type heat exchanger using the same

Abstract

Provided is an L-type turn-fin tube including a turn-fin which may provide excellent adhesiveness even with a tube having a small diameter, and a turn-fin type heat exchanger using the L-type turn-fin tube. The L-type turn-fin tube includes the tube and the turn-fin. A refrigerant moves in the tube. The turn-fin includes a base portion that is formed on one side of a bent portion obtained when a part of a groove portion recessed in a longitudinal direction is bent in the longitudinal direction, and a fin portion that is formed on the other side of the bent portion, wherein the base portion is spirally wound around an outer surface of the tube.

What is claimed is: 
     
         1 . An L-type turn-fin tube comprising:
 a tube in which a refrigerant flows; and   an L-type turn-fin comprising:   a groove portion that is recessed in a longitudinal direction;   a base portion that is formed on one side of a bent portion obtained when a part of the groove portion is bent in the longitudinal direction; and   a fin portion that is formed on the other side of the bent portion,   wherein the base portion is spirally wound around an outer surface of the tube.   
     
     
         2 . The L-type turn-fin tube of  claim 1 , wherein slits are further formed in the groove portion at predetermined intervals in a circumferential direction. 
     
     
         3 . The L-type turn-fin tube of  claim 2 , wherein the slits are formed to pass through the groove portion or/and to be recessed to predetermined depths in the groove portion. 
     
     
         4 . The L-type turn-fin tube of  claim 1 , wherein the fin portion has a cross-sectional thickness that decreases in the longitudinal direction toward an outer circumference. 
     
     
         5 . A turn-fin type heat exchanger comprising:
 the L-type turn-fin tube of any one of  claims 1  to  4 ; and   a bracket that maintains a shape of the L-type turn-fin tube by binding at least one of the L-type turn-fin tube and the L-type turn-fin.