Abstract: The heat exchanger plate presents first adjacent first corrugations generally directed along respective alignment axes in the longitudinal direction of the plate and comprising successive segments that are substantially rectilinear and oblique, being successively inclined in a first sense and in a second sense relative to the longitudinal axis. The heat exchanger plate also has at least one deformation zone constituted by at least one set of segments of second corrugations of generally transverse direction intersecting the set of longitudinal axes along which the first corrugations are disposed. The alignment axes of the segments of second corrugations make an angle lying in the range 45° to 90° with the longitudinal axes of the first corrugations.

Abstract: The invention relates to a plate heat exchanger (1) of the type comprising an impervious chamber (2), a bundle of plates (3) arranged in said chamber (2) and providing therewith a free space (4), an inlet pipe (10) for hot fluid in a first circuit of this bundle (3), an outlet pipe (12) for the cooled fluid, an inlet pipe (20) for a cold fluid communicating with the inlet of the second circuit of this bundle (3), and an outlet pipe (21) for the heated fluid. The heat exchanger also comprises means (25) for channelling the cold fluid along the internal wall of the chamber (2).

Abstract: Plates of a heat exchanger plate pack are formed by a stack of plates defining at least two independent fluid flow circuits, each circuit comprising a central heater part and a border with a smooth surface. A cutout is produced on corners of each plate and on the border to be connected, of each plate to the adjacent plate, a fold is made in order to form a first flange. On this first flange a fold is made in order to form a second flange laying parallel to the central part of the corresponding plate and directed outward from the plate. The plates are superposed and held by applying the second flange of each plate to the second flange of the adjacent plate. A continuous sealed weld bead is made by completely melting the second superposed flanges of adjacent plates.

Abstract: The heat exchanger plate presents first adjacent first corrugations generally directed along respective alignment axes in the longitudinal direction of the plate and comprising successive segments that are substantially rectilinear and oblique, being successively inclined in a first sense and in a second sense relative to the longitudinal axis. The heat exchanger plate also has at least one deformation zone constituted by at least one set of segments of second corrugations of generally transverse direction intersecting the set of longitudinal axes along which the first corrugations are disposed. The alignment axes of the segments of second corrugations make an angle lying in the range 45° to 90° with the longitudinal axes of the first corrugations.

Abstract: A device for injecting pressurized fluids into a multiplate heat exchanger, comprising a leaktight chamber (2) provided with an arrangement for feeding and discharging a first pressurized fluid, a plate pack (1) placed in the chamber (2) and including channels for the flow of this first fluid mixed with a second pressurized fluid, and at least one nozzle (21) for injecting the second fluid. The nozzle (21) is connected to a pipe (22) for feeding the second fluid and to a pipe (24) for discharging the particles deposited on a filter unit placed inside the nozzle (21) downstream of the point where the two pipes (22, 24) join the nozzle (21) with respect to the direction of flow of the second fluid. The invention also relates to a method for cleaning such an injection device.

Abstract: An apparatus for exchanging heat between at least three fluids includes an elongate sealed chamber having at least two separate plate cores arranged inside the sealed chamber and means for supporting each of the plate cores inside the scaled chamber. Each of the plate cores are provided with circuits for two separate fluids, fluid inlet and outlet means for the respective circuits of the plate cores, and connecting means enabling fluid circulation between the plate cores.

Abstract: The subject of the invention is a plate-type heat exchanger including a leaktight vessel (1) of elongate shape divided transversely into at least two independent segments and a plate bundle (3) arranged in the leaktight vessel (1) and formed by a stack of metal plates which are equipped with corrugations defining gaps between them. One gap in two forms a longitudinal main circuit for a first fluid A stretching along the entire length of the plate bundle (3), and the other gaps are divided transversely in order to form at least two secondary and independent circuits for the circulation of a second fluid B and at least one third fluid C and D perpendicular to the direction of circulation of the first fluid A.

Abstract: A bank of plates for a heat exchanger, of the type comprising a stack of parallel plates each having smooth-surface edges and an undulated central portion forming, with the associated plates, a dual circuit for countercurrent flow of two independent fluids. The bank is composed of a plurality of superposed elements, each formed by a pair of plates which are joined together. The superposed elements are connected to each other via a continuous or discontinuous longitudinal weld bead.

Abstract: A device for pressurizing a plate bundle which is arranged in a leakproof vessel (2) and comprises a stack of plates which are parallel to one another to form a first circulation circuit for a first fluid under pressure and a second circulation circuit for a second fluid under pressure. The device includes a first conduit (15) for connecting the vessel (2) to the delivery (10) of the first fluid continuously feeding the vessel (2), a second conduit (16) for connecting the vessel (2) to the delivery (12) of the second fluid feeding the vessel (2) in the event of stoppage of the delivery of the first fluid, and controls (20) for feeding of the vessel (2) with the second fluid.

Abstract: A process for forming a corrugated metal sheet (1) which includes perforations (2) over its entire surface, in which process the metal sheet (1) is laid on a die (11) provided with corrugations (11b), the space (13) delimited beween the metal sheet (1) and the die (11) is sealed by blocking off the perforations (2) in the metal sheet (1), an explosive charge (16) with remote-controlled firing is placed on top of the upper face of the metal sheet (1), a vacuum is created in the space (13) delimited between the metal sheet (1) and the die (11), the entire assembly is immersed in a firing tank filled with water, and firing of the explosive charge is initiated, so that the energy release presses the metal sheet (1) against the die (11). The invention also includes a device for forming a corrugated metal sheet and a corrugated metal sheet formed by the process.

Abstract: A plate bundle for a heat exchanger, of the type comprising a stack of mutually parallel metal heat-exchange plates (10), each including smooth-surfaced edges and a corrugated central part (11) to form, with the associated heat-exchange plates (10), a double circuit for circulation of two independent fluids in counterflow. The plates (10) are connected to one another at their longitudinal edges by connection means (13) and comprise, a zone of heat transfer and exchange between the fluids and, at their free ends, a zone for inlet and outlet of the fluids. The fluid inlet and outlet zones are formed by the plane ends (10a) of the heat-exchange plates (10), between which independent plates (21) provided with reliefs for distributing the fluids in the heat-exchange zone are inserted.