Plattenwärmetauscher

摘要

The invention concerns a plate heat exchanger which comprises a stack of profiled annular plates which are of equal size and identical shape and whose front and rear sides face each other alternately. The heat exchanger surfaces enclosed between an inner and an outer flat edge preferably have undulating profiles. The undulations extend spirally and each begins and ends in a plateau impressed to the height of the crests of the undulations. In the centre of each plateau is a passage through the plate. The plates are welded or soldered at the locations at which they contact one another in the stack. A heat-emitting medium is fed from the periphery to the plate heat exchanger, flowing radially therethrough. In radial counterflow thereto, a heat-absorbing medium flows through the heat exchanger and is supplied and discharged via closed-circuit pipe lines at the end faces. Consequently, a flow cross-section which increases with the radius is provided for the heat-absorbing expanding medium and a decreasing flow cross-section is provided for the heat-emitting medium, the volume of which decreases. The flow is thus stabilized and the transfer of heat improved. Unlike known oil coolers, a filter is not connected axially but is disposed in the periphery of the housing. In this way the filter has a larger surface area and hence service life. Moreover, the dynamic loads on the heat exchanger are reduced.