Fin-and-tube type heat exchanger and water heater including the same

A fin-and-tube type heat exchanger, comprising:

• a case configured such that gas for heating is supplied thereinto;
• a plurality of plate fins housed in the case and arranged in a fore-and-aft direction of the case;
• and
• a heat transfer tube including a plurality of straight-type tubular bodies each passing through the plurality of plate fins in the fore-and-aft direction, the heat transfer tube having opposite ends, a first end of which is provided with a water entry port and a second end of which is provided with a hot water delivery port,
• the plurality of plate fins including a plurality of first plate fins and a plurality of second plate fins that are configured such that each first plate fin and each second plate fin are formed separately from each other and arranged side by side in a right-and-left width direction of the case,
• the plurality of straight-type tubular bodies including a first straight-type tubular body passing through each of the plurality of first plate fins and a second straight-type tubular body passing through each of the plurality of second plate fins,
• the heat transfer tube including a connection tubular body connecting the first straight-type tubular body and the second straight-type tubular body to each other, the heat transfer tube being configured to pass through an area in which the plurality of first plate fins are arranged and an area in which the plurality of second plate fins are arranged,
• each of the plurality of first plate fins includes a first center-side bent piece at an end thereof located close to a center portion of the case in the right-and-left width direction, the first center-side bent piece being configured to protrude from the end in the fore-and-aft direction of the case,
• each of the plurality of second plate fins includes a second center-side bent piece at an end thereof located close to the center portion of the case in the right-and-left width direction, the second center-side bent piece being configured to protrude from the end in the fore-and-aft direction of the case, and
• the first and second center-side bent pieces are configured such that gas for heating having flown toward the first and second center-side bent pieces collides with at least one of the first and second center-side bent pieces, thereby causing gas for heating to be guided toward a pair of straight-type tubular bodies located on opposite sides of the first and second center-side bent pieces.

A fin-and-tube type heat exchanger, comprising:

• a case configured such that gas for heating is supplied thereinto;
• a plurality of plate fins housed in the case and arranged in a fore-and-aft direction of the case;
• and
• a heat transfer tube including a plurality of straight-type tubular bodies each passing through the plurality of plate fins in the fore-and-aft direction, the heat transfer tube having opposite ends, a first end of which is provided with a water entry port and a second end of which is provided with a hot water delivery port,
• the plurality of plate fins including a plurality of first plate fins and a plurality of second plate fins that are configured such that each first plate fin and each second plate fin are formed separately from each other and arranged side by side in a right-and-left width direction of the case,
• the plurality of straight-type tubular bodies including a first straight-type tubular body passing through each of the plurality of first plate fins and a second straight-type tubular body passing through each of the plurality of second plate fins,
• the heat transfer tube including a connection tubular body connecting the first straight-type tubular body and the second straight-type tubular body to each other, the heat transfer tube being configured to pass through an area in which the plurality of first plate fins are arranged and an area in which the plurality of second plate fins are arranged, and
• a portion of each of the first plate fins that extends in the right-and-left width direction is arranged so as to be displaced in the fore-and-aft direction from an extension line extending in the right-and-left width direction from a portion of each of the second plate fins that extends in the right-and-left width direction.