Heat exchanger and hot water apparatus

Abstract

A latent heat recovery heat exchanger includes a heat exchange portion and a case. The heat exchange portion includes a plurality of heat transfer plates layered on one another. The case accommodates the plurality of heat transfer plates of the heat exchange portion. The heat exchange portion includes a front plate portion provided as an outermost layer of the heat exchange portion. The front plate portion of the heat exchange portion forms a part of the case.

1 . A heat exchanger comprising:
 a heat exchange portion including a plurality of heat transfer plates layered on one another; and   a case which accommodates the plurality of heat transfer plates of the heat exchange portion,   the heat exchange portion including a front plate portion provided as an outermost layer of the heat exchange portion, and   the front plate portion of the heat exchange portion forming a part of the case.   
     
     
         2 . The heat exchanger according to  claim 1 , the heat exchanger further comprising a pipe joint portion attached to the front plate portion, the pipe joint portion being configured to allow water and/or hot water to flow in and out of the plurality of heat transfer plates. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 the case includes a rear wall portion arranged to sandwich the plurality of heat transfer plates between the rear wall portion and the front plate portion and a pair of sidewall portions which extends from opposing ends of the rear wall portion toward the front plate portion, and   the pair of sidewall portions is joined to the front plate portion.   
     
     
         4 . The heat exchanger according to  claim 1 , the heat exchanger further comprising a flange member arranged at an upper end portion of the case, wherein
 the flange member includes an extension portion which extends from the upper end portion to outside of the case and an opening provided on an inner side of the extension portion, and   the extension portion is provided to surround the opening.   
     
     
         5 . The heat exchanger according to  claim 4 , wherein
 the flange member includes a rising coupling portion which rises upward from the extension portion along the opening,   the upper end portion of the case is inserted in the opening, and   the rising coupling portion is joined from an outer side to the upper end portion of the case inserted in the opening.   
     
     
         6 . The heat exchanger according to  claim 5 , wherein
 the rising coupling portion includes a peripheral wall portion which surrounds the opening and a first cut portion provided in an upper edge of the peripheral wall portion,   the case includes a second cut portion provided in an upper edge of the upper end portion of the case, and   the first cut portion is arranged to be superimposed on the second cut portion.   
     
     
         7 . The heat exchanger according to  claim 6 , wherein
 the opening is quadrangular when the flange member is viewed from above, and   the first cut portion and the second cut portion are provided in each of four corners of the opening.   
     
     
         8 . A hot water apparatus comprising:
 a combustion apparatus which generates heating gas;   a sensible heat recovery heat exchanger which recovers sensible heat of heating gas generated by the combustion apparatus; and   the heat exchanger according to  claim 1  as a latent heat recovery heat exchanger which recovers latent heat of heating gas.   
     
     
         9 . A hot water apparatus comprising:
 a combustion apparatus which generates heating gas;   a sensible heat recovery heat exchanger which recovers sensible heat of heating gas generated by the combustion apparatus; and   the heat exchanger according to  claim 7  as a latent heat recovery heat exchanger which recovers latent heat of heating gas,   the sensible heat recovery heat exchanger including a heat transfer tube for flow of water and/or hot water,   the heat transfer tube including a water entry portion for entry of water and/or hot water in the heat transfer tube, and   any one of the first cut portion and the second cut portion provided in each of four corners of the opening being arranged directly under the water entry portion.