Heat exchanger and water heating device including same

Abstract

Provided is a heat exchanger which includes a plurality of meandering heat transfer pipes that includes first and second heat transfer pipes, as the plurality of heat transfer pipes, which are adjacent to each other in a predetermined y direction and are misaligned with each other in a z direction such that a plurality of straight pipe parts are in a non-overlapping state in the y direction, in which a first recessed part recessed in the y direction is provided in each curved pipe part of the first heat transfer pipe, and a part of each curved pipe part of the second heat transfer pipe is fitted into the first recessed part.

What is claimed is: 
     
         1 . A heat exchanger comprising:
 a plurality of heat transfer pipes that have a form of a meandering shape, in which a plurality of straight pipe parts that extend in an x direction among x, y, and z directions intersecting with each other and are arranged at intervals in the z direction are connected in a series via a plurality of curved pipe parts, and are located in a region through which a heating medium flows and stacked in the y direction,   wherein the plurality of heat transfer pipes comprises a first heat transfer pipe and a second heat transfer pipe, which are adjacent to each other in the y direction and misaligned with respect to each other in the z direction such that, in a view in the y direction, the plurality of straight pipe parts are in a non-overlapping state and parts of the plurality of curved pipe parts are in an overlapping state, and   wherein a first recessed part recessed in the y direction is provided in a part of each curved pipe part of the first heat transfer pipe, and   wherein a part of each curved pipe part of the second heat transfer pipe is fitted into the first recessed part.   
     
     
         2 . The heat exchanger according to  claim 1 ,
 wherein each curved pipe part of the first heat transfer pipe comprises a pair of side surface parts facing in the y direction, and   the first recessed part is provided in each of the pair of side surface parts.   
     
     
         3 . The heat exchanger according to  claim 1 ,
 wherein each curved pipe part of the first heat transfer pipe comprises a pair of side surface parts facing in the y direction, and   the first recessed part is provided only on one of the pair of side surface parts.   
     
     
         4 . The heat exchanger according to  claim 1 ,
 wherein a second recessed part recessed in the y direction is provided in a part of each curved pipe part of the second heat transfer pipe, and   respective formation places of the first and second recessed parts are fitted to each other.   
     
     
         5 . The heat exchanger according to  claim 1 ,
 wherein the second heat transfer pipe coincides with a configuration of a heat transfer pipe having a same shape and size with the first heat transfer pipe and has been turned upside down.   
     
     
         6 . The heat exchanger according to  claim 1 ,
 wherein, the first and second heat transfer pipes are configured by using metal round pipes.   
     
     
         7 . The heat exchanger according to  claim 1 , further comprising:
 a case which houses the first and second heat transfer pipes therein and the heating medium is supplied to an inside of the case; and   a pair of header parts for inflow of water and outflow of hot water for each of the first and second heat transfer pipes.   
     
     
         8 . The heat exchanger according to  claim 1 ,
 wherein the x and y directions are both horizontal directions, and the z direction is a vertical height direction.   
     
     
         9 . A water heating device comprising the heat exchanger according to  claim 1 .