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A plate heat exchanger for cooling a first fluid by a second fluid, including a plurality of stacked heat exchanger plates forming separate flow channels therebetween with a cover plate on one side and a base plate on the other side of the stacked plates. The plates have a plurality of aligned openi

A plate heat exchanger for cooling a first fluid by a second fluid, including a plurality of stacked heat exchanger plates forming separate flow channels therebetween with a cover plate on one side and a base plate on the other side of the stacked plates. The plates have a plurality of aligned openings defining inlet and outlet channels each communicating with selected ones of connected flow channels. In one form, the cover plate includes a conveying channel guiding one of the fluids to a desired position along the length of the heat exchanger, and the base plate includes a conveying channel guiding the other of the fluids to a desired position along the length of the heat exchanger. In another form, the conveying channels for both of the fluids are in the same one of the cover or base plate.

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The invention claimed is: 1. A plate heat exchanger in which a first fluid is cooled by a second fluid, comprising: a plurality of stacked heat exchanger plates forming flow channels therebetween, the plates having a plurality of aligned openings defining inlet and outlet channels each communicatin

The invention claimed is: 1. A plate heat exchanger in which a first fluid is cooled by a second fluid, comprising: a plurality of stacked heat exchanger plates forming flow channels therebetween, the plates having a plurality of aligned openings defining inlet and outlet channels each communicating with selected ones of the flow channels; a cover plate on one side of the stacked heat exchanger plates, said cover plate at least partially defining a first conveying channel guiding one of said first and second fluids to a desired position along the length of said heat exchanger; and a base plate on another side of the stacked heat exchanger plates, said base plate at least partially defining a second conveying channel guiding another of said first and second fluids to a desired position along the length of said heat exchanger. 2. The plate heat exchanger of claim 1, wherein one of said first and second fluids is oil. 3. The plate heat exchange of claim 1, further comprising a thermostat-control valve in a housing on one of said base and cover plates, said valve including a thermostat-control in said housing, said housing further in communication with one of said fluids. 4. The plate heat exchanger of claim 3, wherein said valve housing includes a first connection to a first source of said one of said first and second fluids and a second connection to a second source of said one of said first and second fluids, said first source fluid being a different temperature than said second source fluid, whereby said valve adjusts communication with said first and second sources depending on the temperature of the other of said first and second fluid. 5. The plate heat exchanger of claim 3, wherein said housing includes: a chamber in which said thermostat-control is in contact with said other of said first and second fluids; and a compartment for said one of said first and second fluids hydraulically connected to an inlet channel of the plate heat exchanger, said compartment including a first connector for connecting to a first source of said one of said first and second fluids and a second connector for connecting to a second source of said one of said first and second fluids, the fluid from said first and second sources having different temperatures. 6. The plate heat exchanger of claim 5, wherein the plate having the conveying channel guiding said other of said first and second fluids includes a cut-out with a flow-deflection element for guiding the other of said first and second fluids into the chamber. 7. The plate heat exchanger of claim 1, wherein one of said first and second conveying channels in one of said cover and base plates transfers one of said first and second fluids from a heat exchange outlet to a desired position along said one of said cover and base plates. 8. The plate heat exchanger of claim 1, wherein: said flow channels for one of said first and second fluids extend between an inlet and an outlet for said one of said first and second fluids, said inlet and said outlet being substantially at opposite longitudinal ends of said heat exchanger; and the inlet channel for the other of said first and second fluids divides said other of said first and second fluids into a first partial stream entering said flow channels for the other of said first and second fluids at one end of said heat exchanger, and a second partial stream which flows from said one end of said heat exchanger through one of said first and second conveying channels to the opposite end of the heat exchanger, said second partial stream entering said flow channels for the other of said first and second fluids at said opposite end of said heat exchanger; whereby in one direction of flow of said other of said first and second fluids, the first and second partial streams have converging flow in said flow channels and in an opposite direction of flow have diverging flow in said flow channels. 9. The plate heat exchanger of claim 8, further comprising a middle channel for said flow channels of said other of said first and second fluids, said middle channel comprising an outlet of converging flow when said other of said first and second fluids flows in said one direction and said middle channel comprising an inlet for diverging flow when said other fluid flows in said opposite direction of flow. 10. The plate heat exchanger of claim 9, wherein said middle channel communicates with one of said first and second conveying channels, said one of said first and second conveying channel communicating with a connector located at a distance from the middle channel along the longitudinal direction of the heat exchanger. 11. The plate heat exchanger of claim 10, wherein said connector is an outlet connector. 12. A plate heat exchanger in which a first fluid is cooled by a second fluid, comprising: a plurality of stacked heat exchanger plates forming flow channels therebetween, the plates having a plurality of aligned openings defining inlet and outlet channels each communicating with selected ones of the flow channels; at least one upper plate and at least one lower plate on opposite sides of the stacked plates; a first conveying channel at least partially defined by one of said upper and lower plates, the first conveying channel guiding one of said first and second fluids to a desired position along the length of said heat exchanger; and a second conveying channel at least partially defined by another of said upper and lower plates, said second conveying channel being a transfer channel for guiding the other of said first and second fluids to a desired position along the length of said heat exchanger. 13. The plate heat exchanger of claim 12, wherein a second transfer channel for the other of said first and second fluids is arranged on one of the upper and lower plates.