PLATE-TYPE HEAT EXCHANGER AND METHOD FOR ITS MANUFACTURE Russian patent published in 1997 - IPC

FIELD: heating or cooling liquid or gaseous media; performing function of condensers and evaporators. SUBSTANCE: heat exchanger includes shell with devices for supply and discharge of one heat transfer agent, at least one stack of corrugated plates connected in pairs over periphery edges and branch pipes for supply and discharge of second heat-transfer agent which are brought in communication with headers formed by ports provided in plates with beads, hold-down slabs with stack of plates mounted between them Shell is provided with heat- and sound-insulation; vertex angle of plate corrugation ranges from 50 to 100 deg; stack has preset width of plates. Each plate may be made of two layers of fastened sheets; plates may be additionally provided with extrusions forming rectilinear or zigzag passages. Shells may be provided with several plate stacks mounted in way of flow of first-transfer agent; branch pipes for discharge of second heat-transfer agent are secured on one stack and are brought in communication with branch pipes feeding this agent to adjacent stack. For manufacture of plate heat exchanger, identical corrugated plates are stamped with peripheral edges and ports with beads, after which plates are rigidly connected in pairs over periphery edges and heat-exchange members formed at this are interconnected by means of beads of ports in adjacent members; then supply and discharge branch pipes are connected and placed in shell. Stamping of plates is effected at preset drawing. Beads of ports have sections projecting above surface of plate corrugations by 0.3 to 0.6 mm forming inclined surface between peripheral edges and beads of ports with at base equal to 45-75 deg. Stack of plates is tightened by means of hold-down slabs and clamping members; extrusion is effected by no more than 2 or 3 stages at intermediate heat treatment. Each plate may be made from two layers by welding or soldering adjacent identical stamped plates over peripheral edges and beads of ports; contacting surfaces of stamped plates are coated with layer of heat-conducting binder are connected by means of seam resistance welding or by argon-arc welding or by soldering. EFFECT: higher efficiency. 17 cl, 14 dwg