Fin tube heat exchanger

Abstract

A fin tube heat exchanger has heat transfer fins disposed in an air flow and plural heat transfer tubes that are inserted in the heat transfer fins and disposed in a direction substantially orthogonal to a flow direction of the air flow. On the heat transfer fins, a set of guide fins and a set of guide fins arranged straightly from upstream to downstream in the flow direction of the air flow are formed, by cutting and raising, on the heat transfer fin surfaces on both sides of the heat transfer tubes. Straight lines that hypothetically interconnect the guide fins and the guide fins slant with respect to the flow direction of the air flow so as to guide the air flow in the vicinities of the heat transfer tubes to rear sides of the heat transfer tubes in the flow direction.

1 . A fin tube heat exchanger comprising:
 heat transfer fins disposed in an air flow; and   plural heat transfer tubes inserted in the heat transfer fins and disposed in a direction substantially orthogonal to a flow direction of the air flow,   wherein   the heat transfer fins include a plurality of guide fins arranged straight from upstream to downstream in the flow direction of the air flow formed by cutting and raising on the heat transfer fin surfaces on both sides of the heat transfer tubes, and   straight lines that hypothetically interconnect the guide fins are inclined with respect to the flow direction of the air flow so as to guide the air flow in the vicinities of the heat transfer tubes to rear sides of the heat transfer tubes in the flow direction of the air flow.   
     
     
         2 . The fin tube heat exchanger of  claim 1 , wherein the height of each of the guide fins gradually increases downstream in the flow direction of the air flow. 
     
     
         3 . The fin tube heat exchanger of  claim 1 , wherein the heat transfer fins include a water drainage promoting portion for causing water accumulating between the guide fins to flow downward. 
     
     
         4 . The fin tube heat exchanger of  claim 3 , wherein the water drainage promoting portion is a slit formed between adjacent ones of the guide fins. 
     
     
         5 . The fin tube heat exchanger of  claim 3 , wherein the water drainage promoting portion is a cutout formed in end portions of mutually adjacent ones of the guide fins. 
     
     
         6 . The fin tube heat exchanger of  claim 3 , wherein the water drainage promoting portion is a water-conducting rib formed between adjacent ones of the guide fins.