Plate-type heat exchanger, especially oil/coolant cooler in vehicles

Claim 1

A plate heat exchanger, with a plurality of trough-shaped heat exchanger plates (2,2') which are stacked one on the other and which have a peripheral collar (4,4'), with a connecting plate (26) which has connection pieces (12) for the supply and discharge of a first fluid, with connecting orifices for the supply and discharge of a second fluid, with fastening elements (15) which cooperate with fastening means (16) in order to fasten the plate heat exchanger (1) to another body (20), and having the following features: the peripheral collar (4, 4') of one heat exchanger plate (2, 2') bears against the peripheral collar (4, 4') of the adjacent heat exchanger plate (2, 2') or against the edge of the connecting plate (26) and is sealingly connected, thereto by assembly, the fastening elements comprise at least one passage (15) which is formed from mutually aligned orifices (6,27) in the heat exchanger plates (2, 2') and in the connecting plate (26), a fastening means designed as a tension rod (16) can be led through the passage (15), in which case, in order to fasten the plate heat exchanger (1), the tension rod (16), at one end, rests externally, in the region of the passage (15), on the connecting plate (26) and/or on the heat exchanger plate (2') adjacent to the latter and, at the other end, is anchored in the body (20), each heat exchanger plate (2, 2') is sealed off, in the region of the aligned orifices (6, 27), relative to the adjacent heat exchanger plates (2, 2') or relative to the adjacent connecting plate (26), the aligned orifices (6) of the heat exchanger plates (2, 2') are in each case provided with a peripheral collar (7, 7'), the peripheral collar (7, 7') of one orifice (6) of a heat exchanger plate (2, 2') bears against the peripheral collar (7, 7') of the adjacent orifice (6) of the adjacent heat exchanger plate (2, 2') or against the edge of the adjacent orifice (26) in the connecting plate (26) and is sealingly connected, in particular soldered, thereto by assembly, defined by the following features: the collars (7, 7') of the orifices (6) are arranged on the heat exchanger plates (2, 2') in such a way that said collars are directed away from the body (20) when the plate heat exchanger (1) is fastened to the body (20), and the free end face of the collar (7') of the respective orifice (6) of a heat exchanger plate (2') adjacent to the connecting plate (26) forms an abutment (18) for the tension rod (16).