STACK OF PLATE HEAT EXCHANGER Russian patent published in 1995 - IPC

FIELD: oil industry. SUBSTANCE: stack of plate heat exchanger has sheets 1 between which sealing bars 3 are disposed. Washers 2 made in form of wire spirals are located in channels. Spirals are formed by turns with different diameters. Maximal diameter relates to minimal one as 2,5...25. Spirals may be connected with sheets by edges and mounted in the channels in vertical. Number of spirals in the channel may be equal to one; the spiral may be mounted inside the channel in form of zigzag. Turns of spiral with maximal diameter have shape of an ellipse; small axis of ellipse is perpendicular to the sheets. Centers of turns of each spiral may be shifted one relatively another. Turns of spirals with maximal diameter may be disposed at entrance and exit parts of the channel. Spirals may be made with monotonous reduction of diameters of turns to form identical cones which are inserted one into the other partially. Turns of spirals with different-sized diameter may be disposed to form alternating parts. EFFECT: improved efficiency. 8 cl, 8 dwg