Combined heat exchanger

Abstract

A combined heat-exchanger includes a first air-cooled heat-exchanger for cooling coolant for a heat generator other than an internal combustion engine in an automobile and a second air-cooled heat-exchanger for cooling refrigerant for air-conditioning. The first air-cooled heat-exchanger includes an upstream tank into which the coolant flows, a downstream tank form which the refrigerant flows out, flow channel members that communicate the upstream tank with the downstream tank, heat release fins that are alternately stacked with the flow channel members, and a water-cooled heat-exchanger for cooling the refrigerant. The water-cooled heat-exchanger is disposed within the downstream tank, and includes an inlet port to which the refrigerant flows at its upper portion and an outlet port from which the refrigerant flows out at its lower portion. According to the heat-exchanger, staying of oil mixed in the refrigerant can be prevented, heat exchange efficiency can improve and downsizing can be achieved.

1 . A combined heat exchanger used for a cooling system that includes a first air-cooled heat exchanger for cooling coolant for a heat generator other than an internal combustion engine in an automobile and a second air-cooled heat exchanger for cooling refrigerant for air-conditioning, wherein
 the first air-cooled heat exchanger includes an upstream tank into which the coolant flows, a downstream tank form which the refrigerant flows out, a plurality of flow channel members that communicate the upstream tank with the downstream tank, a plurality of heat release fins that are alternately stacked with the flow channel members, and a water-cooled heat exchanger for cooling the refrigerant;   the water-cooled heat exchanger is disposed within the upstream tank or the downstream tank, and includes an inlet port to which the refrigerant flows at an upper portion thereof and an outlet port from which the refrigerant flows out at a lower portion thereof; and   the second air-cooled heat exchanger is disposed below the first air-cooled heat exchanger and the refrigerant that flown out from the water-cooled heat exchanger flows into the second air-cooled heat exchanger.   
     
     
         2 . The combined heat exchanger according to  claim 1 , wherein
 the water-cooled heat exchanger is disposed within the downstream tank.   
     
     
         3 . The combined heat exchanger according to  claim 1 , wherein
 the first air-cooled heat exchanger and the second air-cooled heat exchanger are disposed adjacent to each other on a plane perpendicular to a flow of cooling air therethrough.   
     
     
         4 . The combined heat exchanger according to  claim 1 , wherein
 the water-cooled heat exchanger is configured by stacking a plurality of refrigerant flow-passage units as flow passage of the refrigerant with gaps therebetween, the coolant flowing through the gaps, and   each of the refrigerant flow-passage units is oriented vertically.   
     
     
         5 . The combined heat exchanger according to  claim 4 , wherein
 a lower end of each of the refrigerant flow-passage units is formed almost circularly rounded.   
     
     
         6 . The combined heat exchanger according to  claim 4 , wherein
 each of the refrigerant flow-passage units includes a shell tube on which an inflow port communicating with the inlet port and an outflow port communicating with the outlet port are formed near both ends thereof in a flow direction of the refrigerant, and an inner fin that is fixed in the shell tube and on which an inflow hole corresponding to the inflow port, an outflow hole corresponding to the outflow port and a plurality of grooves along a flow of the refrigerant are formed; and   a slit extended from the inflow hole and a slit extended from the outflow hole are formed on the inner fin.   
     
     
         7 . The combined heat exchanger according to  claim 4 , wherein
 each of the refrigerant flow-passage units includes a shell tube on which an inflow port communicating with the inlet port and an outflow port communicating with the outlet port are formed near both ends thereof in a flow direction of the refrigerant, and an inner fin that is fixed in the shell tube and on which an inflow hole corresponding to the inflow port, an outflow hole corresponding to the outflow port and a plurality of grooves along a flow of the refrigerant are formed; and   a notch along an edge on a side of the inflow hole and a notch along an edge on a side of the outflow hole are formed on the inner fin.