Heat exchanger

Abstract

A heat exchanger including: a plurality of heat transfer tubes that are disposed in a flow of a gas, extend in a second direction intersecting a first direction in which the gas flows, and are arranged at intervals; and a plurality of plate fins that extend in the first direction, are provided to straddle the plurality of heat transfer tubes, and are arranged at intervals in the second direction, in which the plate fins include a plurality of slits that extend in a third direction and are arranged at intervals in the first direction, the third direction being a direction intersecting both the first direction and the second direction, and the plurality of slits have zigzag shapes that alternately and obliquely extend toward an upstream side and a downstream side of the first direction in which the gas flows, and patterns of the zigzag shapes match each other.

1 . A heat exchanger comprising:
 a plurality of heat transfer tubes that are disposed in a flow of a gas, extend in a second direction intersecting a first direction in which the gas flows and are arranged at intervals; and   a plurality of plate fins that extend in the first direction, are provided to straddle the plurality of heat transfer tubes, and are arranged at intervals in the second direction,   wherein the plate fins include a plurality of slits that extend in a third direction and are arranged at intervals in the first direction, the third direction being a direction intersecting both the first direction and the second direction,   the plurality of slits have zigzag shapes that alternately and obliquely extend toward an upstream side and a downstream side of the first direction in which the gas flows, and patterns of the zigzag shapes match each other,   the slit is located at the same position as a point of the heat transfer tube that is located to be closest to the upstream side of the first direction on a stage adjacent to the upstream side of the first direction or at a position that is located toward the downstream side of the first direction as compared to the point, and is located at the same position as a point of the heat transfer tube that is located to be closest to the downstream side of the first direction on a stage adjacent to the downstream side of the first direction or at a position that is located toward the upstream side of the first direction as compared to the point.   
     
     
         2 . The heat exchanger according to  claim 1 ,
 wherein the heat transfer tubes are arranged in a staggered arrangement in which the heat transfer tubes are alternately shifted in the first direction and the third direction, and   the slits extend toward the upstream side in the first direction between the plurality of heat transfer tubes arranged in the third direction to be adjacent to each other on the upstream side in the first direction.   
     
     
         3 . The heat exchanger according to  claim 2 ,
 wherein a position of a vertex of the zigzag shape in the third direction matches a position of the heat transfer tube in the third direction.   
     
     
         4 . The heat exchanger according to  claim 2 ,
 wherein the slits are provided for every two stages of the heat transfer tubes that are arranged in the third direction and are adjacent to each other in the first direction.   
     
     
         5 . The heat exchanger according to  claim 1 , further comprising:
 protrusions that protrude from the plate fins in the second direction, extend in the first direction, and are provided at intervals in the third direction to form a pair,   wherein the pair of the protrusions are located on each of an upstream side and a downstream side of the heat transfer tube in the first direction.   
     
     
         6 . The heat exchanger according to  claim 5 ,
 wherein a gap for allowing the gas to flow between the protrusion and the heat transfer tube is provided.   
     
     
         7 . The heat exchanger according to  claim 5 , further comprising:
 protruding portions that protrude toward the third direction from part of the heat transfer tube on the downstream side in the first direction among the plurality of heat transfer tubes.   
     
     
         8 . A heat exchanger comprising:
 a plurality of heat transfer tubes that are disposed in a flow of a gas, extend in a second direction intersecting a first direction in which the gas flows, and are arranged in a staggered arrangement in which the plurality of heat transfer tubes are alternately shifted in a third direction, which is a direction intersecting both the first direction and the second direction; and   a plurality of plate fins that extend in the first direction, are provided to straddle the plurality of heat transfer tubes, and are arranged at intervals in the second direction,   wherein the plate fins include holes that penetrate in the second direction on an upstream side of each of the plurality of heat transfer tubes in the first direction.   
     
     
         9 . The heat exchanger according to  claim 8 , further comprising: 
       protrusions that protrude from the plate fins in the second direction, extend in the first direction, and are provided at intervals in the third direction to form a pair,
 wherein the pair of the protrusions are located on each of the upstream side and a downstream side of the heat transfer tube in the first direction. 
 
     
     
         10 . The heat exchanger according to  claim 9 ,
 wherein a gap for allowing the gas to flow between the protrusion and the heat transfer tube is provided.   
     
     
         11 . The heat exchanger according to  claim 9 , further comprising:
 protruding portions that protrude toward the third direction from part of the heat transfer tube on the downstream side in the first direction among the plurality of heat transfer tubes.