Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
  • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning

Definitions

• the invention relates to the field of plate heat exchangers, used in particular for the exchange of heat between two gases, but also between two liquids or between a liquid and a gas.
• Particularly interesting heat exchangers for the invention are gas-gas exchangers which operate with large or small flow volumes at relatively low pressures, for example from 0.01 to 1.5 MPa. They can be used, for example, as air preheaters for furnaces or can form part of NOx reduction installations (“DeNOx” devices).
• DeNOx NOx reduction installations
• heat exchangers The function of heat exchangers is to implement a heat exchange between a fluid at high temperature and a fluid at low temperature without mixing them. Plate heat exchangers have good thermal performance thanks to their large exchange surface, while being compact.
• Plate heat exchangers recover heat by arranging a plurality of plates stacked parallel to each other at predetermined intervals. Said plates are spaced so that the space between two adjacent plates forms a channel through which a fluid can flow. A high temperature fluid and a low temperature fluid are alternately supplied to successive channels so as to effect heat transfer between the high temperature fluid and the low temperature fluid through each plate.
• Patent EP165179B1 describes a plate heat exchanger whose channels are defined by the space included between pressed quadrilateral plates. Said pressed plates comprise two pairs of opposite edges curved at 90 ° in opposite directions: one upward pair and one downward pair when considering the plates in a horizontal plane. The pressed plates are mounted symmetrically and are associated to each other by welding their vertical edges. In such a heat exchanger, the inlet and the outlet of each channel are identical.
• Patent application US2010 / 0006274A1 describes a plate heat exchanger consisting of quadrilateral plates having at least two opposite edges curved with respect to the heat transfer surface. Fluid channels are defined by the space between a pair of identical plates which are positioned mirror image of each other. Therefore, the two curved edges of a plate are in contact with the two curved edges of the symmetrical plate. Thus, the plates are curved on at least two opposite edges.
• Plate heat exchangers are also known from patent application FR 2 806469, where each of the plates has edges on each of its four sides: if one of these plates is considered in a horizontal plane, two of its opposite edges extending upwards allowing the junction of the plate with an upper plate, and the two other opposite flanges extending downwards allowing the junction of said plate with a lower plate.
• the junctions between adjacent plates are made by welding between their respective edges.
• the object of the invention is to provide an improved plate heat exchanger, in particular with a plate design guaranteeing a reduced number of manufacturing operations and / or a reduced manufacturing time, and in particular, moreover, without affecting the performance. heat transfer operated by the exchanger or its robustness.
• the invention firstly relates to a pair of heat exchanger plates comprising a first plate and a second heat exchanger plate, arranged opposite and spaced apart from each other by so as to define an internal volume capable of forming a channel for the flow of a first fluid, and each comprising a central panel.
• Said central panels are plane and parallel to each other.
• Two opposite sides of the central panel of the first plate are inclined relative to said central panel in the direction of the second plate (towards the inside of the pair of plates after the two plates are assembled in pair) and form first joining panels coming from in contact with the two opposite edges corresponding planes of the central panel of the second plate.
• at least one of the central panels, in particular all of the central panels are quadrilateral or quadrilateral with truncated, cut or rounded edges.
• a “flat” edge within the meaning of the invention is to be understood with its usual meaning, namely that the edge is entirely flat, from one end to the other on the side of the plate in question, and that to the opposite edge.
• a “flat” edge within the meaning of the invention therefore does not include a portion which would not be, and which, for example would be inclined relative to the central panel (the central panel, as detailed below can be entirely flat or present reliefs, such as grooves or protuberances, in relation to a median plane).
• a "flat” edge within the meaning of the invention has no junction panel within the meaning of the invention. It extends the central panel without angular modification with it.
• the two plates of the pair of plates are geometrically different from each other. They are not identical, they are advantageously devoid of symmetry with respect to one another: they are not, preferably, "mirrors" or symmetrical to one another with respect to a plane, an axis. or a point. And it is a very innovative feature to choose to geometrically differentiate the plates to be assembled in pairs.
• the first junction panels are symmetrical to one another with respect to an axis contained in the plane of the central panel and passing through the midpoints of the other two sides not provided with these first junction panels, called by the continued “first median axis”.
• Said first junction panels make it possible to connect the first plate to the second plate, by joining them together, for example by welding.
• the space between the first and the second heat exchanger plate forms a first channel for receiving a first fluid.
• manufacture / shaping of the plates may also include a step of cutting / folding the corners of said plates.
• the pair of plates according to the invention exhibits thermal transfer performance on the same level as pairs of conventional plates, where the edges of the plates intended to be assembled are both shaped / bent to be mechanically welded / secured. Note that their mechanical robustness is also maintained at the same level.
• At least one of, in particular all of the, first junction panels of the central panel of the first plate comprises a first part extending from the central panel and a second part extending from said first part, said first part forming an angle ⁇ with the central panel and said second part being parallel to said central panel.
• junction panels in particular the two parts of these junction panels, can be obtained by folding (s) of the plate, and that the inclination of the junction panel, in particular of the first part when it has two parts, does not necessarily mean a perfect bend angle: the intersection between the plane of the central panel and that of the junction panel can form a rounded corner / curved transition zone.
• the second part can extend the first with a curved transition zone between one and the other.
• the angle a between the first part of the first junction panel and the central panel is at least 45 °, preferably at least 60 °, in particular between 80 and 110 °, preferably in the vicinity of 90 ° .
• the width of the first part of the junction panel and its angle of inclination a relative to the central panel define the spacing between the two plates A, B: for example, for the same angle, plus the first part of the junction panel will be wide, and the more space between the two plates will be important.
• the junction panel thus comes from by its sizing and its positioning relative to the central panel, determine on its own the height of the volume in which one of the fluids will flow, once the exchanger is made up of one or more of these pairs, at a given plate size.
• the two other opposite sides of the central panel of the first plate are inclined with respect to said central panel in the direction opposite to the first junction panels (extending towards the outside of the assembly consisting of the pair of plates therefore) and form second junction panels, in particular in order to come into contact with the corresponding opposite plane edges of the central panel of a third plate.
• the third plate can be part of another pair of plates intended to be assembled with the pair of plates already described, in order to constitute an exchanger comprising a stack of several pairs of plates.
• this third plate can be of identical conformation to the second plate, and, in particular, be as it plane, devoid of junction panels on its edges: the second junction panels come to be fixed, for example by welding, to two plane edges of this third plate.
• said second junction panels of the second central panel are symmetrical to each other with respect to an axis contained in the plane of their central panel and passing through the midpoints of the other two sides, hereinafter called "second median axis"
• At least one, in particular all of the second joining panels of the central panel of the first plate comprises a first part extending from the central panel and a second part extending from said first part, said first part forming an angle b with the central panel and said second part being parallel to said central panel.
• These second junction panels can therefore be of similar conformation to the first junction panels, therefore in one or two parts. They will allow, on the same principle, by their dimensioning and their inclination with respect to the central panel, to define a given spacing between the first plate and the third plate, and therefore only define the height of the volume in which another fluid will go. flow (generally of different composition and / or temperature type characteristics), once the exchanger is made up of several of these pairs, at a given plate size.
• the dimensioning and / or the inclination of the first and second junction panels is effectively chosen to be different, the volume dedicated to the flow of the two fluids being different.
• the angle b between the first part of the second junction panels and the central panel is at least 45 °, preferably at least 60 °, in particular between 80 and 110 °.
• the two other opposite sides of the central panel of the second plate are inclined with respect to said central panel in the same direction as the first junction panels (therefore oriented towards the outside of the assembly constituted by the pair of plates considered therefore) and form third junction panels, in particular with a view to coming into contact with the corresponding opposite edges of the central panel of a fourth plate.
• the second plate of the first pair of plates provides the junction with another pair of plates comprising this fourth plate and which is adjacent to it once the exchanger has been assembled.
• Said fourth plate in question has corresponding edges (those which are intended to ensure the junction with the third junction panels) which are preferably planar, and it can be completely flat, like the previous third plate.
• said third junction panels of the second central panel are symmetrical to each other with respect to an axis contained in the plane of their central panel and passing through the midpoints of the other two sides, hereinafter called “third “median” axis.
• one of, in particular all of the third joining panels of the central panel of the second plate comprises a first part extending from the central panel and a second part extending from said first part, said first part forming an angle Q with the central panel and said second part being parallel to said central panel.
• the angle Q between the first part of the third junction panels and the central panel is at least 45 °, in particular between 80 and 110 °.
• the dimensioning and the inclination of these third junction panels are similar or identical to those of the second junction panels, because they determine, as for the second panels, the spacing between two pairs of plates conditioning the volume of the l 'space where another fluid will flow, once the assembled heat exchanger, for a given plate size.
• the second and / or third junction panels are different from the first junction panels, in particular in width and / or in inclination with respect to their respective central panels.
• the first will determine, as already seen, a given height of volume for the flow of a first heat exchange fluid, and the second / third another given height of volume for the flow of another. heat exchange fluid (or a fluid identical to the first in its composition / temperature ).
• the first and / or second and / or third junction panels when they are in two parts, may have their first and second parts approximately in the shape of a Z, with the second part extending from the first in a s' shape. away from the central panel. Alternatively, they can be roughly an inverted C-shape, with the second part instead folding back towards the central panel.
• the first and / or second and / or third junction panels are obtained by folding the edges of the central panels of the plates.
• it may be a single folding operation, or several folding operations, including two.
• the invention thus also relates to a pair of plates as described above, where the first and / or second and / or third junction panels are obtained by folding the edges of the central panels of the plates.
• the plates are assembled to each other by welding between a plane edge of one of the plates and a plane part of a junction panel of the other plate, once brought into contact, either in a single pair of plates, or between two plates of two pairs of adjacent plates.
• a subject of the invention is also a stack of pairs of heat exchanger plates (A, B) comprising at least two pairs of successive plates spaced apart as described above, designated by the first pair of heat exchanger plates and the second. pair of heat exchanger plates, in which:
• said first pair and said second pair are arranged parallel to one another and facing each other, the space between the plates of each pair forming a channel for receiving a first flow of fluid (F ! ), - the space between the first and the second pair of heat exchanger plates forms a channel for receiving a second fluid flow (F 2 ), said second pair preferably being identical to said first pair or being a mirror image of said first pair.
• the stack of pairs of heat exchanger plates (A, B) comprises two successive spaced pairs which are connected laterally by closure means, which preferably comprise a side bar, or a plate of covering with a C or U profile, or a suitable, flat cover plate, for example hexagonal or pentagonal.
• the stack of pairs of heat exchanger plates (A, B) comprises two successive spaced pairs which are connected laterally by second or third junction panels.
• the subject of the invention is also a plate heat exchanger comprising pairs of heat exchanger plates or stacks of pairs of heat exchanger plates as described above, said pairs or stack of pairs being arranged in a chassis.
• a subject of the invention is also a method of manufacturing a stack of at least two pairs of heat exchanger plates as described above, said method comprising the following steps:
• first junction panels each comprising a first part inclined relative to the central panel, said junction panels preferably being symmetrical to each other with respect to a first median axis of the central panel;
• the heat exchanger plates in two stacks, namely a first stack of plates identical to each other, and a second stack of plates identical to each other and different from the plates of the first stack,
• Figure 1a shows two heat exchanger plates A and B according to an embodiment of a "one pair of junction panels" variant.
• FIG. 1b represents the corresponding pair of plates according to the invention when said plates A and B are assembled.
• Figures 2a, 2b show two plates A and B according to an embodiment of a variant "with two pairs of junction panels”.
• FIG. 2b shows the pair of plates according to Figure 2a when said plates A and B are assembled.
• FIG. 2c represents two pairs of plates according to FIG. 2b, assembled together.
• Figure 3a shows two plates A and B of a pair of heat exchanger plates according to the invention in another embodiment of the "two pair of junction panel" variant.
• Figure 3b shows the pair of plates of Figure 3a when said plates A and B are assembled.
• side or “edge” of the central panel is used with reference to the periphery of the central panel, over a certain width, for example up to 5 or 10% of the width of the central panel. plaque.
• mirror image means symmetry about a plane in the middle of the space separating the object from its image.
• the “internal face” of a plate designates the face turned in the direction of the other plate with which it is assembled in pair, and the “external face” of this plate is the face turned in. direction opposite to the other plate of the pair in question.
• the invention can be used for example for plate heat exchangers operating according to the principle of cross-flow ("cross-flow exchanger" according to the English terminology) in which the fluids flowing on the two faces of each plate are directed substantially perpendicular to each other.
• the invention can also be used for plate heat exchangers operating according to a countercurrent principle, in which the fluids flowing on both sides of each plate are directed substantially in opposite directions ("counter-current exchanger" in the English terminology).
• the invention can also be used for plate heat exchangers operating according to a co-current flow principle in which the fluids flowing on the two faces of each plate are directed in substantially the same direction.
• the invention can also be used for plate type heat exchangers operating according to other flow principles.
• the direction of fluid flow is determined by the design of the plates and how they are connected through the junction panels. It can be modified by baffles ("baffles" in English) arranged in some of the fluid flow channels, including every other channel.
• the baffles start downstream from the fluid inlet areas between the plates, and extend to the fluid outlet.
• the baffles allow, downstream of the fluid inlet zone, to modify the fluid flow direction for the first time to approximately 90 ° so that the fluid flows in. the same direction as the fluid in the next channel, then the baffles allow a second change in the fluid flow direction at 90 ° so that the fluid flows in the direction of the outlet area of the channel.
• the invention is particularly suitable for heat exchange between two fluids, in particular two gases, but can also be used for exchanging heat between two liquids, or between a liquid and a gas.
• the invention is more particularly suitable for the exchange between two gases, in particular gas flows at the inlet and at the outlet of a single piece of equipment, such as for example the air to be conveyed to a furnace and the fumes from the furnace. same furnace or, similarly, hot stream from a NOx reduction system and cold stream going to the same NOx reduction system.
• a plate heat exchanger according to the invention can be used for fluids operating at a pressure ranging from full vacuum pressure up to 1.5 MPa, preferably 0.01 to 1.0 MPa, more preferably. 0.01 to 0.6 MPa.
• a plate heat exchanger according to the invention can consist either of channels of uniform height, or of channels of different heights on each circuit. So corresponding, the height of the first junction panel and the heights of the second and third junction panel, if any, may be the same or different.
• the height of the channels can be determined depending on the operating conditions. Typically, it can be 5 to 30mm, especially 5mm, 10mm, 15mm, 20mm, 30mm or any suitable height.
• the width of the heat exchanger plate according to the invention can typically be between 1000 mm and 2000 mm, preferably between 1300 mm and 1700 mm.
• the length of the heat exchanger plate according to the invention can typically be between 1000 mm and 7500 mm, preferably between 1500 mm and 7000 mm.
• the thickness of the plate may be between 0.6 mm and 6 mm, preferably between 1.5 mm and 2.0 mm.
• the central panel of the heat exchanger plate according to the invention may have any suitable shape, for example trapezoidal, hexagonal or quadrilateral.
• the central panel is most preferably quadrilateral, in particular rectangular or square, possibly with truncated corners.
• the central panel comprises a first face (or lower face) and a second face (or upper face) opposite to the first face.
• the terms “lower” and “upper” therefore refer, by convention, to a panel arranged in a horizontal plane.
• the first and the second face can be flat but can also locally include reliefs, grooves or protuberances.
• protuberances (“dimples” according to Anglo-Saxon terminology) can be added or pressed into the central panel of the plates. Growths can be implemented on one side of the plate or on both sides of the plate with several arrangements depending on the characteristics of the plate and the use of said projections.
• the protuberances can be used as spacers and are intended to minimize deformation of the plates when stacked on top of each other. Single or double growths are typically distributed over the center panel surface of the heat exchanger plates.
• hairpin or picot fins (“fine pine” according to English terminology) can also be welded to the central panel of the heat exchanger plate according to the invention using resistance welding.
• the heat exchanger according to the invention comprises a first channel intended to receive a first fluid located between the two heat exchanger plates of a single pair of plates according to the invention. Said two plates are mechanically connected by the first two junction panels of the first plate.
• the heat exchanger according to the invention comprises a second channel intended to receive a second fluid located between two pairs of consecutive plates.
• closure means can be used, if necessary, to close the lateral sides of the second channel and to seal the channel.
• said closing means can be mechanically connected to the plates by any means known to those skilled in the art, for example by welding, in particular by seam welding ("seam welding" according to the English terminology) or by bolting.
• each pair of plates comprises only one pair of junction panels
• the second channel can advantageously be provided with means for closing its lateral side between two pairs of successive plates.
• closure means can be side bars (“edge bars” in English terminology) or dedicated cover plates (“cover parts” in English terminology) or any other equivalent means.
• the cover plates can be manufactured in one or more pieces, some having a C-shape, or a U-shape or any profile to join the second plate of the first pair and the first plate of the second pair.
• each pair of plates comprises two pairs of junction panels
• one of the plates comprises a pair of junction panels, namely the first junction panels such as described above
• the same plate or the other plate comprises another pair of junction panels, namely the second or third junction panels such as previously described: in this case, each pair is assembled to the other by the second or third pairs of junction panels.
• closure means can be advantageously arranged longitudinally in the direction of flow of the second fluid (that circulating between two pairs of assembled plates) at the level of the inlet and at the level of the outlet of the second channel.
• closure means may be a polygonal cover plate having a suitable shape.
• first and second channels intended to receive the fluid (s) either can be completely empty (“free” channel), or can include mechanical reinforcement means, such as connection bars (“connecting bars”). »According to Anglo-Saxon terminology).
• spacers manufactured for example from strips (“strips” according to Anglo-Saxon terminology), profiles, protuberances or pin fins, can be inserted into minus one / each channel to ensure the spacing between the plates. They can be loose or can be spot welded, or even be held in place using U-shaped clamps at the supply and discharge level.
• each of the junction panels comprises a part, in particular a single part, or comprises several parts extending successively from the central panel of the plate, and this or these parts are preferably all flat or substantially flat (with possible roundings. in the transition / folding zones between the central panel and the part or the first part, and between two successive parts when the panel comprises several.
• the last part, furthest from the central panel is flat and parallel to the planes of the central panels, to maximize the contacting surfaces forming the junction between two plates, thus facilitating their attachment to one another, their mechanical connection.
• junction panels are preferably obtained by folding operations of the plates, but can be obtained differently, and even be attached to the central panels by various conventional fixing means.
• each of the junction panels can be mechanically fixed to the central panel of the adjacent plate by any conventional technique, typically by welding.
• the second part of each of the junction panels can be large enough to allow mechanical attachment of the second part to the central panel of the adjacent plate by conventional means, known to those skilled in the art.
• the second junction panels can be oriented relative to the plane of the central panel, with an angle b of between 10 ° and 90 °, preferably between 20 ° and 60 °, and more preferably between 30 ° and 50 °. °, or with an angle b of between 60 ° and 120 °, preferably between 70 ° and 110 °, and more preferably between 80 ° and 100 °.
• each junction panel when it comprises two parts, may extend from the first part of the junction panel parallel to the plane of the central panel, said second part being either oriented or inwardly of the central panel. 'space between two plates of a pair (which will serve as a flow channel for a fluid) of the channel, ie outward, on the other side of this space.
• Each of the junction panels can preferably be formed in a single step, by deformation / folding.
• the deformation can be obtained by press forming and / or by bending.
• a series of flat sheet metal deformation steps may be required to form a series of side junction panels on a single plate (one or two pairs of panels).
• different areas of the central panel of the plates of the heat exchanger may be provided with an insulation layer, comprising a part of metal plate parallel to the central panel, with air. between the metal plate part and the central panel.
• Said insulation layer can make it possible to locally modify the temperature of the wall of the heat exchanger plate and can typically be implemented in the coldest areas of the cold channel.
• An example is described in patent application CZ298773.
• a tip (“ferrule" according to English terminology) can be mounted over the edges of the two adjacent plates welded together, serving as a shield protecting the junction.
• the tip is typically made from a piece of sheet metal bent so as to be able to cover the solder joint.
• the end cap can be welded to each of the two plates.
• the heat exchanger plate according to the invention can be formed in one piece, usually by one-step deformation of a flat metal sheet made of a weldable material, for example a steel plate, for example steel. stainless.
• the (or all) heat exchanger plate according to the invention can also be manufactured by assembling several independent plate parts, by conventional assembly means.
• Figure 1a shows two heat exchanger plates A and B according to an embodiment of a variant "with a pair of junction panels", in which the plate B is flat, that is to say devoid of junction panel. It is an exploded view of the two plates facing each other and oriented with respect to each other in the way they will be when assembled as shown in Figure 1b.
• the central panel A 0 is rectangular in shape and has 4 numbered sides, Ai, A 2 , A 3 and A 4 .
• Ai and A 2 are two opposite sides.
• a 3 and A 4 are two other opposite sides. All parts of plate B are numbered in the same way, with B 0 the central panel and B 1 , B 2 , B 3 , B 4 its four sides.
• the central panel A 0 is provided with a (first) pair of junction panels, namely two junction panels, respectively Pi on the side A and P 2 on the opposite side A 2 , which are symmetrical to one another. 'other with respect to a first median axis x of the central panel A 0 .
• each of the junction panels P and P 2 is formed of two parts, a first part, respectively P 1A and P 2A , forming an angle a with the central panel A 0 and a second part, respectively P 1B and P 2B , which is parallel to the central panel A 0 .
• Each junction panel is connected by a fold line to the center panel A 0 , but it could also have been supplied as a second component and have been attached to / attached to the center panel.
• Each two-part junction panel is preferably formed in a single pass, by deformation of the plate A.
• the first and second junction panels P and P 2 are oriented at an angle of about 75 ° to the plane of the central panel A 0 .
• the heat exchanger plate B has no junction panel and is substantially planar.
• the two central panels A 0 and B 0 face each other.
• Figure 1b illustrates a schematic perspective view of the two plates A and B of Figure 1a as they are disposed relative to each other when assembled and mechanically connected at the first pair of panels. junction P, and P 2 of plate A to form a pair of heat exchanger plates according to one embodiment of the invention.
• the two plates of figure 1a have been superimposed so as to be able to be connected mechanically.
• the "internal face" of the plate A faces the "internal face” of the plate B.
• the first junction panel P, of the plate A is welded at the level of its second part P 1B to the plate B on the edge plan of side Bi of central panel B 0 .
• the second junction panel P 2 of the plate A is welded at its second part P 2B to the plate B on the plane edge of the opposite plane side B 2 of the central panel B 0 .
• the space thus formed between the plate A and the plate B constitutes a first channel of the heat exchanger consisting of the pair of plates according to the invention, in which a first fluid F ! can flow.
• the first channel has a trapezoidal flow cross section and said cross section here is the same over the entire length of the channel.
• FIGS. 2a and 2b represent a perspective view of two plates A and B, respectively separately and then assembled, according to a first embodiment of a variant "with two pairs of junction panels", in which the exchanger plate A is provided with two pairs of junction panels, inclined in opposite directions in which and the exchanger plate B is devoid of junction panel.
• the central panel A 0 of the plate A is provided with two pairs of junction panels:
• the first P junction panels, on the side and P 2 on the opposite side A 2 which are symmetrical to each other with respect to the median axis x of the central panel A 0 , and which are oriented towards the side of the internal face of the plate A (from analogous to the junction panels of Figures 1a, 1b);
• the second junction panels P 3 on the side A 3 and P 4 on the opposite side A 4 which are symmetrical to each other with respect to the second median axis y, and which are oriented on the side of the external face of the plate A.
• the median axes x and y are perpendicular to each other.
• the first junction panels P, and P 2 consist of two parts, a first part, respectively P 1A and P 2A , forming an angle a with the central panel A 0 , and a second part, respectively P 1B and P 2B , which is parallel to the central panel, and which extends outward from the panel.
• the second junction panels P3 and P4 consist of two parts, a first part, respectively P 3A and P 4A , forming an angle b with the central panel and a second part, respectively P 3B and P 4B , which is parallel to the center panel plate but extending inward of the panel.
• the first junction panels P, and P 2 are oriented towards the internal face of the plate B at an angle of approximately 75 ° with respect to the plane of the central panel A 0 .
• the second junction panels P 3 and P 4 are oriented towards the side of the external face of the plate A at an angle b of approximately 90 ° with respect to the plane of the central panel A 0 .
• the junction panels are preferably formed in a single pass, by deformation. The deformation can be obtained by press forming and / or by bending, after cutting the corners.
• the heat exchanger plate B has no junction panel and is substantially planar.
• the two central panels A 0 and B 0 face each other.
• FIG. 2b illustrates a schematic perspective view of the two plates A and B of FIG. 2a once assembled and mechanically connected at the level of the first junction panels P ⁇ and P 2 of the plate A to form a pair of exchanger plates heat.
• the two plates have been superimposed so that they can be mechanically connected.
• the "internal face" of the plate A faces the "internal face” of the plate B.
• the junction panel P ⁇ of the plate A is welded at the level of its second part P 1B to the plate B on the plane side Bi of central panel B 0 .
• the junction panel P 2 of the plate A is welded at its second part P 2B to the plate B on the opposite plane side B 2 of the central panel B 0 .
• the channel formed between the plate A and the plate B constitutes a first channel of the heat exchanger consisting of the pair of plates according to the invention, in which a first fluid F1 can flow.
• the first channel has a trapezoidal flow cross section and said cross section is the same over the entire length of the channel.
• the second junction panels P3 and P4 of the plate A make it possible to associate the plate A with a third exchanger plate, preferably identical to the plate B, which would be positioned opposite the external face. of the plate A, in order to create, between the third plate and the plate A, a second space defining a channel in which a second fluid F 2 can flow.
• the second channel has, in this embodiment, a rectangular flow cross section.
• FIG. 2c represents plates which have on their surface “dimples” or protuberances already mentioned above, as well as, in dotted lines, spacers intended to guarantee a constant spacing between the two central panels, here in the form of profiles. These elements remain optional, but can prove useful in particular with large plates.
• Figure 3a shows two plates A and B of a pair of heat exchanger plates according to the invention in another embodiment of the variant "with two pairs of junction panels", in which the heat exchanger plate A is provided with a (first) pair of junction panels, and in which the exchanger plate B is also provided with a (third) pair of junction panels.
• Figure 3b shows the pair of plates when said plates A and B are assembled.
• the central panel A 0 of the plate A is provided with a first pair of junction panels: P, on the side A and P 2 on the opposite side A 2 , which are symmetrical to each other with respect to the median axis x of the central panel A 0 , and which are oriented towards the internal face of the plate B, as in the preceding Figures 1a-1b.
• the central panel B 0 of the plate B is provided with a third pair of junction panels: the junction panels R 3 on the side B 3 and R 4 on the opposite side B 4 , which are symmetrical to each other. 'other with respect to the median axis y' of the central panel B 0 , and which are oriented towards the side of the external face of the plate B.
• the median axes x and y ' are perpendicular l' to each other, with the difference that here, they materialize on two different plates parallel to each other, and not on the same plaque.
• the first junction panels P, and P 2 consist of two parts, a first part, respectively P 1A and P 2A , forming an angle a with the central panel and a second part, respectively P 1B and P 2B , which is parallel to the central panel plate A 0 , and extend from the side of the internal face of said plate.
• the third junction panels R 3 and R 4 consist of two parts, a first part, respectively R 3A and R 4A , forming an angle Q with the central panel B0 and a second part, respectively R 3B and R 4B , which is parallel to the central panel plate B 0 , but which is oriented towards the side of the outer face of the plate B.
• the first junction panels P ⁇ and P 2 are oriented downwards at an angle of approximately 90 ° in relation to the plane of the central panel A 0 .
• the third junction panels R 3 and R 4 are oriented at an angle Q of approximately 90 ° with respect to the plane of the central panel B 0 .
• the junction panels are preferably formed in a single pass, by deformation. The deformation can be obtained by press forming and / or by bending, after cutting the corners.
• Figure 3b illustrates a schematic perspective view of how the two plates A and B of Figure 3a are assembled and mechanically connected at the first and second junction panel P, and P 2 of the plate A to form a pair of heat exchanger plates:
• the two plates have been combined and welded via the junction panels P, and P 2 on the sides B ! and B 2 of plate B in a manner similar to FIG. 2b.
• the channel formed between the plate A and the plate B constitutes a first channel of the heat exchanger, in which a first fluid F ! can flow.
• the first channel has a rectangular flow cross section.
• the third junction panels R 3 and R 4 of the plate B allow in this configuration to associate the plate B with a fourth exchanger plate, preferably identical to the plate A, which would be positioned opposite the external face of the plate B, in order to create, between the plate B and the fourth plate (not shown), a second channel in which a second fluid F 2 can flow, in particular crosswise.
• the height of the pairs of junction panels is chosen according to the desired fluid flow rate.
• FIG. 3b represents an exchanger operation in crossed streams of the flows of the fluids F and F 2 , of the flows perpendicular to each other therefore, that one obtained using internal baffles (not shown) which change the direction of the fluid F 2 , once the admission zone has passed.
• the exchangers therefore comprise several pairs of plates according to the invention mounted in a frame, with alternations of plates of each of the two types, for example (ABAB) n times without excluding stacks of type (ABBA) n times, with a junction between two pairs which is made by junction panels integrated into the plates according to the invention or by additional components added, as seen above.
• ABAB ABAB
• ABBA stacks of type

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=70614280

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (7)

• 2020
  • 2020-03-26 FR FR2002999A patent/FR3108714B1/fr active Active
• 2021
  • 2021-03-02 KR KR1020227033074A patent/KR20220158722A/ko unknown
  • 2021-03-02 EP EP21707758.5A patent/EP4127589A1/de active Pending
  • 2021-03-02 WO PCT/EP2021/055206 patent/WO2021190879A1/fr unknown
  • 2021-03-02 US US17/914,079 patent/US20230117804A1/en active Pending

Also Published As

Similar Documents

Legal Events