Heat exchanger

A heat exchanger, comprising:

• a duct including at least two plates combined into a cylindrical shape, a first fluid flow channel provided inside the duct through which a first fluid passes, an inflow port for the first fluid on one end of the first fluid flow channel, and an outflow port for the first fluid on another end of the first fluid flow channel;
• a stacked core that is accommodated in the duct and includes a plurality of tubes having flat shapes and being stacked, a second fluid flow channel provided inside each of the plurality of tubes through which a second fluid passes, and outer fins arranged between adjacent tubes of the plurality of tubes, the tubes and the outer fins being brazed to each other;
• and
• a coupling plate that is blazed to the duct and has a groove portion defining a peripheral edge of the inflow port or the outflow port, wherein
• the duct includes a first plate having a wall surface extending in a tube stacking direction, and a second plate disposed to face at least one of end faces of the stacked core in the tube stacking direction, and
• the second plate includes a second-plate end plate portion that extends in the tube stacking direction and is brazed to a wall surface of the first plate, a second-plate center plate portion disposed to face the end face of the stacked core in the tube stacking direction, and a flange portion that extends from at least the second-plate center plate portion in the tube stacking direction and is brazed to a bottom wall surface of the groove of the coupling plate.

A heat exchanger, comprising:

• a duct including a first plate and a second plate combined into a cylindrical shape, a first fluid flow channel provided inside the duct through which a first fluid passes, an inflow port for the first fluid on one end of the duct in a first fluid flow direction, and an outflow port for the first fluid on another end of the duct in the first fluid flow direction;
• a stacked core that is accommodated in the duct and includes a plurality of tubes having flat shapes and being stacked, a second fluid flow channel provided inside each of the plurality of tubes through which a second fluid passes, and outer fins arranged between adjacent tubes of the plurality of tubes, the tubes and the outer fins being brazed to each other;
• and
• coupling plates that have frame shapes and are brazed to both end portions of the duct in the first fluid flow direction to define the inflow port and the outflow port, wherein
• a direction perpendicular to a tube stacking direction and the first fluid flow direction is defined as a core width direction,
• the first plate includes first-plate both end plate portions disposed to face both end faces of the stacked core in the core width direction and brazed to the stacked core, a first-plate center plate portion disposed to face one end face of the stacked core in the tube stacking direction and brazed to the stacked core, and first plate flange portions that extend outward in a direction away from the first fluid flow channel from both end portions of the first plate in the first fluid flow direction and have surfaces facing the coupling plates and being perpendicular to the first fluid flow direction,
• the second plate includes second-plate both end plate portions disposed to face both end faces of the stacked core in the core width direction and brazed to the stacked core, a second-plate center plate portion disposed to face another end face of the stacked core in the tube stacking direction and brazed to the stacked core, and second plate flange portions that extend outward in a direction away from the first fluid flow channel from both end portions of the second plate in the first fluid flow direction and have surfaces facing the coupling plate and being perpendicular to the first fluid flow direction,
• the first-plate both end plate portions and the second-plate both end plate portions are brazed at positions where overlapped with each other in the core width direction, and
• the first plate flange portions and the second plate flange portions are brazed to bottom wall surfaces of the coupling plates which are perpendicular to the first fluid flow direction.

A heat exchanger, comprising:

• a duct including a first plate and a second plate combined into a cylindrical shape, a first fluid flow channel provided inside the duct through which a first fluid passes, an inflow port for the first fluid on one end of the duct in a first fluid flow direction, and an outflow port for the first fluid on another end of the duct in the first fluid flow direction;
• a stacked core that is accommodated in the duct and includes a plurality of tubes having flat shapes and being stacked, a second fluid flow channel provided inside each of the plurality of tubes through which a second fluid passes;
• and
• a coupling plate that is blazed to the duct and includes a groove portion defining the inflow port or the outflow port, wherein
• the first plate includes a pair of first-plate both end plate portions that extends in a tube stacking direction, a first-plate center plate portion that connects the first-plate both end plate portions to each other and is disposed to face one end face of the stacked core in the tube stacking direction, a first plate flange portion that extends from the first-plate center plate portion and the first-plate both end plate portions in the tube stacking direction and is brazed to a bottom wall surface of the groove portion of the coupling plate, and
• the second plate includes a pair of second-plate both end plate portions that extend in the tube stacking direction and are overlapped with and brazed to the first-plate both end plate portions, a second-plate center plate portion that connects the second-plate both end plate portions to each other and is disposed to face another end face of the stacked core in the tube stacking direction, and a second plate flange portion that extends from the second-plate center plate portion and the second-plate both end plate portions in the tube stacking direction and is brazed to the bottom wall surface of the groove portion of the coupling plate.