Heat exchange device and heat source machine

Abstract

The heat exchange device includes a primary heat exchanger and a secondary heat exchanger. The secondary heat exchanger is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed. The secondary heat exchanger includes a plurality of first pipes and a plurality of second pipes. Each of the plurality of first pipes and the plurality of second pipes extends in a zigzag manner in the vertical direction by a plurality of linear portions being connected to a plurality of curved portions in series. Each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction.

What is claimed is: 
     
         1 . A heat exchange device which is capable of recovering sensible heat and latent heat of a combustion gas, comprising:
 a primary heat exchanger which recovers the sensible heat of the combustion gas; and   a secondary heat exchanger which is disposed to overlap the primary heat exchanger in a vertical direction in a state in which the heat exchange device is installed and which recovers the latent heat of the combustion gas,   wherein the secondary heat exchanger comprises a plurality of first pipes, and a plurality of second pipes each alternately adjacent to each of the plurality of first pipes in a direction intersecting the vertical direction,   each of the plurality of first pipes and the plurality of second pipes has a plurality of linear portions and a plurality of curved portions connecting the plurality of linear portions with each other and extends in a zigzag manner in the vertical direction by the plurality of linear portions being connected to the plurality of curved portions in series, and   each of the plurality of linear portions of each of the plurality of second pipes is disposed to be displaced from each of the plurality of linear portions of each of the plurality of first pipes in the vertical direction.   
     
     
         2 . The heat exchange device according to  claim 1 , wherein the primary heat exchanger comprises a plurality of fin pipes, and
 each of the plurality of fin pipes extends in a direction in which the plurality of linear portions extend.   
     
     
         3 . The heat exchange device according to  claim 1 , wherein the secondary heat exchanger comprises a circumferential wall portion surrounding the plurality of first pipes and the plurality of second pipes,
 the circumferential wall portion comprises a main body portion and an expanded portion which expands outward from the main body portion, and   each of the plurality of first pipes and each of the plurality of second pipes are disposed in an inner space of the circumferential wall portion surrounded by the main body portion and an inner space of the circumferential wall portion expanded due to the expanded portion.   
     
     
         4 . A heat source machine, comprising:
 the heat exchange device according to  claim 1 ; and   a burner disposed on a side of the primary heat exchanger opposite to the secondary heat exchanger,   wherein the burner is formed to be able to supply the combustion gas in the order of the primary heat exchanger and the secondary heat exchanger.