Combustion apparatus having air intake preheater

A combustion apparatus having an air intake preheater, the combustion apparatus comprising:

• a premixing chamber in which external air introduced through an air intake hole 120 is pre-mixed with a combustion gas;
• a blower supplying mixed-gas that is pre-mixed in the premixing chamber to a burner;
• a combustion chamber in which the mixed-gas is burnt by ignition of the burner;
• a heat exchanger in which water is heat-exchanged with combustion heat of the combustion chamber;
• an exhaust gas discharge part through which an exhaust gas passing through the heat exchanger is discharged;
• a duct through which the exhaust gas passing through the exhaust gas discharge part is discharged to the outside;
• and
• an air intake preheater in which the exhaust gas discharged from the duct through the exhaust gas discharge part is heat-exchanged with the air supplied to the premixing chamber through the air intake hole,
• wherein the preheater comprises a channel defining member in which a plurality of unit plates are stacked on each other in a predetermined distance to adjacently alternately define exhaust gas channels and air intake channels separated from each other therein,
• wherein each of the unit plates is constituted by a first plate and a second plate bonded to each other so that the exhaust gas channel is defined therein, and
• an exhaust gas channel is connected between the first plate and the second plate of the unit plates disposed adjacent to each other by an exhaust gas channel connection member, and
• an exhaust gas introduction tube and an exhaust gas discharge tube are connected to the exhaust gas channel connection member are defined in one side of the unit plate, and
• the air intake channel is defined in a space between the unit plates disposed adjacent to each other.