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In a cogeneration apparatus, a heat exchanger includes an exhaust gas passageway for passage therethrough of exhaust gas, a heat medium passageway for passage therethrough of a heat medium that gives heat energy to a water heater etc., and a water passageway for taking heat from the exhaust gas and

In a cogeneration apparatus, a heat exchanger includes an exhaust gas passageway for passage therethrough of exhaust gas, a heat medium passageway for passage therethrough of a heat medium that gives heat energy to a water heater etc., and a water passageway for taking heat from the exhaust gas and giving the heat to the heat medium. Cooling water for a water-cooled engine is given to the water passageway. The cogeneration apparatus requires reduced numbers of the heat exchanger and pipes, and hence a reduced number of necessary component parts, so that the cogeneration apparatus can be reduced in cost.

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1. A cogeneration apparatus comprising: a water-cooled engine;an electric generator drivable by the water-cooled engine to generate electric energy; anda heat exchanger for acquiring heat energy from high-temperature exhaust gas discharged from the engine and giving the acquired heat energy to a wat

1. A cogeneration apparatus comprising: a water-cooled engine;an electric generator drivable by the water-cooled engine to generate electric energy; anda heat exchanger for acquiring heat energy from high-temperature exhaust gas discharged from the engine and giving the acquired heat energy to a water heater and/or a heating appliance,wherein the heat exchanger includes an exhaust gas passageway for passage therethrough of the exhaust gas, a heat medium passageway for passage therethrough of a heat medium that gives heat energy to the water heater and/or the heating appliance, and a water passageway for taking heat from the exhaust gas and giving the taken heat to the heat medium,wherein cooling water for the water-cooled engine is given to the water passageway,wherein the heat medium passageway, the water passageway, and the exhaust gas passageway are concentric with each other,wherein the heat medium passageway is being radially external to and surrounds both the water passageway and the exhaust gas passageway,wherein the heat exchanger further includes: a top plate having an exhaust gas inlet formed centrally therein for taking in the exhaust gas;a holding member formed in a conical cape and extending downward from an underside of the top plate for holding a three-way catalyst;a reinforcing plate provided on the underside of the top plate for reinforcing the holding member;a first cylindrical member provided outside the reinforcing plate and having a helical recess in an outer cylindrical peripheral wall surface thereof;a generally cup-shaped partition member provided in contact with the recessed outer cylindrical peripheral wall surface of the first cylindrical member for partitioning an interior of the heat exchanger;a cooling water guide plate provided outside the partition member for guiding the cooling water;a plurality of exhaust gas guide pipes extending through the cooling water guide plate for guiding the exhaust gas;a second cylindrical member provided under the top plate in contact with an outer surface of the cooling water guide plate;a cooling water blocking member provided near a lower end portion of the second cylindrical member for closing the lower end portion of the second cylindrical member where the cooling water flows;a bottom plate provided on a lower end of the second cylindrical member for closing a bottom of the second cylindrical member;an outer member provided on an outer surface of the second cylindrical member to define an outermost wall of the heat exchanger;a heat medium guide plate provide between the outer plate and the second cylindrical plate for guiding the heat medium;an exhaust gas outlet provided in the bottom plate;a cooling water inlet and cooling water outlet provided in the second cylindrical member with the cooling water inlet disposed below the cooling water outlet; anda heat medium inlet and heat medium outlet provided in the outer plate with the heat medium inlet disposed below the heat medium outlet,wherein the exhaust gas passageway has a first portion defined jointly by the holding member, the first cylindrical member, and a bottom part of the cup-shaped partition member and extending linearly downward from the exhaust gas inlet through the three-way catalyst to the bottom part of the partition member, a second portion defined between the recessed outer cylindrical peripheral wall surface of the first cylindrical member and a cylindrical wall part of the cup-shaped partition member and extending helically upward from a lower end of the first cylindrical member to the underside of the top plate, a third portion defined by respective cylindrical peripheral walls of the exhaust gas guide pipes and extending linearly downward from top ends to bottom ends of the exhaust gas guide pipes, and a fourth portion defined between the cooling water blocking plate and the bottom plate and extending from the bottom ends of the exhaust gas guide pipes to the exhaust gas outlet,wherein the heat medium passageway is defined jointly by the second cylindrical member, the outer member, and the heat medium guide plate and extends helically upward from the heat medium inlet to the heat medium outlet, andwherein the water passageway is defined jointly by the cylindrical part of the partition member, the cooling water guide member, and the second cylindrical member and extends helically upward from the cooling water inlet to the cooling water outlet.