FR3070480B1 - MICROCHANNEL THERMAL EXCHANGE PLATE HAVING PLATE EDGE ASSEMBLY MEMBER - Google Patents

Abstract

The main object of the invention is a heat exchange plate (2) for a heat exchange device (10) between first and second fluids, comprising at least two strips (B1, B2) extending between first and second fluids. (4) and second (6) edges in a first direction (X) and arranged side by side in a second direction (Y), each band (B1, B2) having a corrugation comprising vertices (9) and troughs (7). ), two directly adjacent strips (B1, B2) being arranged in such a way that the vertices (9) are offset in the first direction (X) and that, in the second direction (Y), the apex (9) of a band (B1) and the hollow (7) of the strip (B2) directly adjacent define circulation paths (C1, C2) of the second fluid, characterized in that it comprises at least one connecting element (11, 12 ) at the edge allowing the plate to be assembled with one or more other plates within the heat exchange device (1 0).

Description

MICROCHANNEL THERMAL EXCHANGE PLATE HAVING PLATE EDGE ASSEMBLY ELEMENT

DESCRIPTION

TECHNICAL AREA

The present invention relates to the general field of heat exchangers or heat exchangers, in particular heat exchangers with polymer plates. The invention finds applications in various fields of industry, and in particular for technologies developing a large heat exchange area per unit volume while maintaining reasonable hydraulic head losses. For example, the invention can be applied to produce a radiator-type gas / liquid exchanger, a liquid / liquid exchanger, in particular with corrosive fluids, an evaporator or a condenser, an exchanger arranged on the wall of a building, an exchanger radiator type natural convection, an onboard liquid / gas exchanger for aeronautics and aerospace, among others.

Thus, the invention proposes a microchannel heat exchange plate having at its edge an assembly element to another plate, a heat exchange device comprising at least one such plate, and an associated manufacturing method of such a heat exchange plate.

STATE OF THE PRIOR ART

The heat exchangers or heat exchangers with microchannels comprise an envelope provided with a plurality of microchannels in which a fluid circulates. The fluid may be in liquid and gaseous form changing phase, or the fluid is in liquid form or in gaseous form. The outer surface of the envelope exchanges heat with the external environment by convection. For example, an air flow can evacuate or provide heat. The outer surface of the casing may be provided with fins to increase the exchange surface with the external environment.

This type of heat exchanger is for example used in evaporators or condensers of thermal machines with mechanical compression of refrigerant.

US patent application US 2011/0139420 A1 describes an example of a microchannel heat exchanger intended to be implemented in an air conditioning device. The heat exchanger comprises flat tubes arranged parallel to each other, each tube having a plurality of microchannels. The microchannels are connected in parallel to a common power supply and to a common evacuation. The tubes are for example made of aluminum by extrusion. The tubes are twisted. Air circulates between the tubes. Fines are provided between the tubes to promote heat exchange with the air flowing between the tubes. Air circulates between the tubes and the fins. The presence of the fins causes clogging of the passages between the tubes and the fins, and the appearance of a pressure drop within the device and therefore a drop in efficiency of the heat exchange device. In addition, this device has many parts to manage and assemble. In addition the thermal connections between the tubes and the fins are difficult to achieve in order to obtain a good thermal connection between the tubes and the fins. The manufacturing cost of this device is therefore high.

International application WO 2016/097032 A1 describes another example of a multichannel heat exchanger with corrugated plates. Each plate comprises strips between two edges of the plate in a first direction and arranged side by side in a second direction. Each strip comprises at least one fluid circulation channel extending from one edge to the other of the plate, and has a corrugation comprising peaks and valleys, making it possible to delimit traffic paths of another fluid. This embodiment can however be complex to achieve and may not be optimal in terms of thermo-hydraulic performance.

DISCLOSURE OF THE INVENTION The object of the invention is to remedy at least partially the needs mentioned above and the drawbacks relating to the embodiments of the prior art. The invention thus has, according to one of its aspects, a heat exchange plate for a heat exchange device between a first fluid and a second fluid, the heat exchange plate extending in a plane, the heat exchange plate comprising at least two strips extending between a first edge of the heat exchange plate and a second edge of the heat exchange plate, opposite the first edge, in a first direction, the strips being arranged next to each other in a second direction, perpendicular to the first direction, each of the strips having at least one channel, in particular a plurality of channels, extending from the first edge to the second edge and opening into the first edge and the second edge, said at least one channel being intended for the circulation of a first fluid, said strips each having a corrugation comprising peaks and troughs, two directly adjacent bands or ad being arranged relative to one another so that a vertex of a strip and an apex of the directly adjacent strip are shifted in the first direction and so that, in the second direction, the vertex of a strip and the hollow of the directly adjacent strip define circulation paths of a second fluid, characterized in that the heat exchange plate comprises at least one connecting element on each of its first and second edges , secured to said at least two strips for assembling the heat exchange plate with one or more other heat exchange plates within the heat exchange device.

Advantageously, the heat exchange plate does not require the implementation of fins, the manufacture can be substantially simplified. In addition, the problems of fouling are reduced, which allows to maintain a certain level of efficiency. Moreover, the corrugations of the strips create a tortuosity favorable to thermal exchanges between the first fluid circulating in the microchannels and the plate.

In addition, they generate a large heat exchange surface between the plate and the second fluid.

In other words, the heat exchange plate comprises microchannels for a first fluid, the plate being shaped so as to define virtual channels for circulation of a second fluid in a direction normal to that of the channels. The presence of flow or flow paths extending in the second direction normal to the first direction in which the microchannels extend provides a large flow of air with a low pressure drop while ensuring the existence of obstacles between the virtual channels, these obstacles making it possible to break the boundary layers on the structure, causing the appearance of turbulence beneficial to the development of convective heat exchange coefficient on the surface of the plate.

The thermal plate according to the invention may further comprise one or more of the following characteristics taken separately or in any possible technical combinations.

Preferably, each strip has a honeycomb structure, having two substantially parallel walls forming the upper and lower faces of the strip, extending in the first direction, and a plurality of internal partitions, substantially parallel to each other and perpendicular to the two walls, connecting the walls together, so as to define a plurality of microchannels, each channel forming a cell corresponding to the space between two successive partitions and the two walls.

In addition, each strip may comprise a first flat portion forming at least partly the first edge of the heat exchange plate and a second flat portion forming at least partly the second edge of the heat exchange plate, each of the first and second edges of the heat exchange plate comprising at least one connecting element, in particular a single connecting element extending over the entire edge, respectively secured to the first and second planar portions of each strip.

Advantageously, the axial dimension in the first direction of said at least one connecting element is substantially equal to the axial dimension along said first direction of the flat portion to which it is secured.

Said at least one connecting element may advantageously form an intermediate joining element intended to be positioned between two heat exchange plates of the heat exchange device, said at least one connecting element having an upper face extending according to the plan, intended to be secured to a first heat exchange plate, in particular by welding, and a lower face extending in the plane, intended to be secured to a second heat exchange plate, in particular by welding, intended to be in contact with the first heat exchange plate.

Moreover, said at least one connecting element may comprise, on at least one of its two lateral faces extending perpendicular to the plane, at least one rib extending perpendicularly to the lateral face and over the entire length of the the lateral face in the second direction, in particular at least one rib formed at the intersection between the lateral face and the upper face, extending in the plane, and / or between the lateral face and the lower face, extending according to the plane of said at least one connecting element, respectively in the extension along the second direction of the upper face and / or the lower face of said at least one connecting element.

According to another variant of the invention, each strip may comprise, at each of its ends located respectively at the level of the first edge and the second edge of the heat exchange plate, an assembly element in the form of a box. hollow end inside which open the channel or channels for the circulation of the first fluid, said hollow end box being formed in particular by overmoulding at the corresponding end of the strip.

Each hollow end box may have open side faces, extending perpendicularly to the plane, and closed top and bottom faces, extending in the plane, to allow flow of the first fluid in the second direction.

Alternatively, each hollow end box may have closed side faces, extending perpendicular to the plane, and open top and bottom faces, extending in the plane, to allow flow of the first fluid in a third vertical direction. , the first, second and third directions forming a direct trihedron.

In addition, advantageously, each hollow end box may comprise, on a first face, a male connecting rib and, on a second face opposite to the first face, a female assembly groove, the assembly of a male connector rib of a first hollow end box with a female connector groove of a second hollow end box for assembling the first and second end boxes, and thus the assembly a plurality of strips therebetween to form one or more heat exchange plates.

In addition, each strip is preferably made of a polymer material and manufactured by extrusion and shaping.

The production of an extrusion strip is advantageously done by means of an extruder whose die is equipped with a calibration die, this calibration die particularly making it possible to impart to the extruded material a honeycomb structure.

All the strips may have the same corrugation, the corrugations of two adjacent strips being out of phase, the phase shift being such that a hollow of one strip is aligned with a vertex of the adjacent strip in the second direction.

The general profile of the undulation of the bands may be a sinusoidal curve. In a variant, preferably, the general profile of the undulation of the bands may be in an arc of a circle, comprising a juxtaposition of elementary curves in the form of "S", each formed by the union of two semi-circles reversed with respect to each other. to the other.

Preferably, the strips may have a thickness of between 0.5 and 3 mm. A wall, formed by the upper face, the lower face or a partition of a strip, may have a thickness between 0.2 and 1 mm, preferably equal to about 0.3 mm.

The height of the channel or channels may be between 0.5 and 3 mm, being preferably equal to about 1 mm. Similarly, the width of the channel or channels may be between 0.5 and 3 mm, being preferably equal to about 1 mm.

Each band may comprise between 4 and 50 channels, and preferably about 10 channels.

The pitch of the undulation of the bands, corresponding to the distance between two successive peaks of the band, may be between 10 and 30 mm, preferably being about 20 mm.

In addition, each band may have between 4 to 50 corrugations, and in particular about 6 corrugations. The corrugation angle, defined as the angle formed by the tangent to the curvature of a vertex of the strip relative to the plane of extension of the strip, may be between 10 and 80 °, being for example equal to at about 30 °.

Preferably, the peaks of the strips are located on one side of the plane of the heat exchange plate and the recesses are located on the other side of the plane of the heat exchange plate.

In another aspect, the subject of the invention is also a heat exchange device or heat exchanger, characterized in that it comprises at least one heat exchange plate as defined above.

The heat exchange device according to the invention comprising at least one heat exchange plate has a very high heat exchange compactness in terms of square meter of primary exchange surface reduced to the volume of the structure.

Advantageously, the heat exchange device comprises a plurality of plates stacked one on the other in the third vertical direction defined above. New virtual channels are then defined between the bands of the plates that intersect. Depending on the orientation of the plates relative to each other and the distance between the plates, it is possible to very easily adapt the heat exchanger to the operating conditions of the heat exchangers and to the required compactness. Indeed, the section of the circulation or flow paths can be varied easily, changing the pressure losses through the stack and the size of the stack.

The heat exchange plates of the heat exchange device may be identical. They can be oriented relative to each other so that each vertex of a heat exchange plate bears against a hollow of another heat exchange plate.

The heat exchange plates may, if necessary, be secured to each other by welding or glue points at a hollow and an apex, two vertices or two recesses.

In addition, the invention also relates, in another of its aspects, to a method of manufacturing a heat exchange plate as defined above, characterized in that it comprises the following steps: a) manufacturing by extrusion of strips, in particular made of polymer, provided with at least one channel, b) shaping of each strip by hot deformation so as to form a corrugation of the strip making it possible to obtain an embossed strip, c) fixing at least one connecting element at each end of each strip to allow the assembly of heat exchange plates to each other.

Said at least one connecting element may for example form an intermediate assembly element positioned between two heat exchange plates of the heat exchange device, the heat exchange plates and said at least one intermediate assembly element being joined together by welding.

Alternatively, said one connecting member may form a hollow end box into which the opening or channels for the circulation of the first fluid, formed by overmolding at the ends of each strip, open.

The heat exchange plate, the heat exchange device and the manufacturing method according to the invention may comprise any of the features set forth in the description, taken alone or in any technically possible combination with other characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood on reading the detailed description which follows, non-limiting examples of implementation thereof, as well as the examination of the figures, schematic and partial, of the accompanying drawing, in which: - Figure 1 is a perspective view of an embodiment of a band for a first variant of a heat exchange plate according to the invention, - Figure 2 is a enlarged and partial view of FIG. 1; FIG. 3 is a partial perspective view of an example of an interlining element for the first variant of heat exchange plate according to the invention, FIG. 4 represents, in perspective, an example of a heat exchange device obtained by the superposition of heat exchange plates according to the first variant; FIG. 5 is an enlarged and partial view of FIG. 4; FIGS. 6 and 7 are perspec views As a result of separate examples of strip production for a second variant of a heat exchange plate according to the invention, FIG. 8 represents, in perspective, an example of a heat exchange device obtained by superposing plates. heat exchange according to the second variant, and - Figure 9 is an enlarged partial front view of Figure 8.

In all of these figures, identical references may designate identical or similar elements.

In addition, the different parts shown in the figures are not necessarily in a uniform scale, to make the figures more readable.

DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS

It is pointed out that in the following description of two particular embodiments of the invention, each strip is obtained from a polymeric material and manufactured by extrusion and heat-formed to form the corrugation.

In addition, in a common way to the two embodiments described below, each heat exchange plate 2 allows the heat exchange between a first fluid and a second fluid, for example air. The heat exchange plate 2 extends in a plane P and comprises at least two strips BI and B2 extending between a first edge 4 and a second edge 6 of the heat exchange plate 2, opposite the first edge 4 in a first direction X.

The strips B1, B2 are arranged next to each other in a second direction Y, perpendicular to the first direction X, each of the strips B1, B2 having channels 5 extending from the first edge 4 to the second edge 6 and opening into the first edge 4 and the second edge 6, for the circulation of the first fluid. In addition, the strips B1, B2 each have a corrugation comprising vertices 9 and recesses 7, two directly adjacent bands B1, B2 being relatively arranged relative to one another so that a vertex 9 of a band B1 and a vertex 9 of the directly adjacent band B2 are offset in the first direction X and such that, in the second direction Y, the vertex 9 of a band B1 and the hollow 7 of the band B2 directly adjacent define circulation paths C1, C2 of the second fluid, as can be seen in FIGS. 4 and 8.

Advantageously, each heat exchange plate 2 comprises at least one assembly element 11 or 12 on each of its first 4 and second 6 edges, secured to the strips B1, B2 allowing the assembly of the heat exchange plate 2 with one or more other heat exchange plates 2 within the heat exchange device 10. Two possible embodiments of an assembly element 11, 12 are thus described below.

More specifically, with reference to Figures 1 to 5, there is illustrated a first embodiment of the invention.

According to this first variant, several strips B are produced individually from a polymer material by extrusion.

The production of a strip B by extrusion is done by means of an extruder whose die is equipped with a sizing die for imparting to the extruded material a honeycomb structure, as shown in Figures 1 and 2.

More particularly, the band B has two substantially parallel walls forming the upper faces Bs and lower Bi of the band B, extending in the first direction X, and a plurality of internal partitions 23, substantially parallel to each other and perpendicular to the two walls Bs and Bi, connecting the walls together, so as to define a plurality of microchannels 5, each of them forming a cell corresponding to the space between two successive partitions 23 and the two walls Bs and Bi. Preferably, each band B thus has a plurality of parallel microchannels 5 distributed along the second direction Y, perpendicular to the first direction X.

For example, as represented in FIG. 2, the height hc of the microchannels 5 is between 0.5 and 3 mm, being for example of the order of 1 mm. The width lc of the microchannels is likewise between 0.5 and 3 mm, being for example of the order of 1 mm. More generally, each microchannel 5 may have a hydraulic diameter of between 0.5 mm and 10 mm.

In addition, each band B may comprise from 4 to 50 microchannels, and preferably of the order of 10 microchannels. Each strip B may have a wall thickness of between 0.2 and 1 mm, for example equal to approximately 0.3 mm.

Moreover, after extrusion, each strip B is shaped (embossed) by hot deformation in order to form a corrugation between the longitudinal ends of each strip B. Preferably, this wave is periodic. The corrugation is advantageously the same for all the strips B. However, the corrugations of two adjacent strips are out of phase at the heat exchange plate 2, so that a recess 7 of a strip is aligned with a vertex 9 of the adjacent band in the second direction Y. Thus, as shown in Figure 4 for example, circulation paths Cl, C2 of maximum section are delimited. The ripple can correspond to a sinusoidal curve. Preferably, the undulation is in an arc of circle, comprising a juxtaposition of elementary curves in the form of "S", each formed by the meeting of two semi-circles inverted with respect to each other.

As can be seen in FIG. 1, the pitch p0 of the corrugation, corresponding to the distance between two successive vertices 9, may for example be between 10 and 30 mm, preferably being of the order of 20 mm. In addition, each band B may comprise between 4 and 50, preferably 6, undulations. Finally, the angle of the corrugation a, which represents the inclination of an undulation with respect to the horizontal formed by the first direction X, is for example between 10 and 80 °, being preferably of the order of 30 °. The corrugation of each strip B can be achieved by a die exit operation, while the profile is still plastic on an extruded strip of appropriate width.

Alternatively, this corrugation operation can be performed on a strip cut from an extruded plate of large width. This band is then heated by hot air, infrared, etc ...., or any other means known to those skilled in the art, to achieve a plastic state, then be deformed by calendering on a form tool.

Furthermore, each strip B obtained comprises a first flat portion 13 forming at least partly the first edge 4 of the heat exchange plate 2 to be formed and a second flat portion 14 forming at least partly the second edge 6 of the plate heat exchange 2 to form.

Once the strips B obtained, as shown in Figures 1 and 2, assembly elements 11 as shown in Figure 3 are used, the latter being secured to the first 13 and second 14 planar portions of each strip B .

These connecting elements 11 form intermediate assembly elements 11 which, as can be seen in FIG. 4, representing the heat exchange device 10 obtained according to this first example of implementation of the invention, are positioned between two plates of heat exchange 2 adjacent vertically, extending over the entire edge of the plates.

Each intermediate assembly element 11 has an upper face extending along the plane P as defined below in connection with FIG. 8, intended to be secured by welding to a first heat exchange plate 2, and a lower face 11l extending along the plane P, intended to be secured by welding to a second heat exchange plate 2, the first and second plates being in contact with each other. As can be seen in FIG. 5, within one and the same heat exchange plate 2, a plurality of B-strips may be welded together along Ls-weld lines to increase the number of microchannels 5 along the second Y direction, while preferentially the intermediate elements 11 are in one part along the second direction Y, the same intermediate element 11 being thus arranged on at least two bands B welded together.

The weld makes it possible to seal between the corrugated strips B and the intermediate elements 11. It is carried out while the intermediate elements 11 and the strips B are located in a positioning tool. The welding may notably consist of the fusion of the adjacent walls, whether the outer walls of the strips or the ribs 15 of the intermediate elements 11. This welding is carried out by hot air, by radiant panels in the infrared, by laser or by any another technique known to those skilled in the art to perform this type of welding.

Depending on the welding device used, the assembly can be welded in a single operation, or by moving a welding source at a predetermined speed in front of the parts to be welded. It is also possible to have a fixed welding device and to move the assembly comprising the parts to be welded.

Furthermore, as can be seen in FIG. 3, each intermediate element 11 comprises, on its two lateral faces 111, two ribs 15 extending perpendicularly to the corresponding lateral face 111 and along the entire length of the lateral face 111 in the second direction Y. Also, each intermediate element 11 has four ribs 15 formed at the intersections between the lateral faces 111 and the upper faces 11 and 11 lower in the extension along the second direction Y of the upper faces 11 and 11 lower.

These intermediate elements 11 may advantageously be made of a polymeric material. The ribs 15, or else designated as being "teeth", can be formed on one or both sides, as here, of the intermediate element 11. They can be made either directly by extrusion, or alternatively by machining . Advantageously, these ribs 15 make it easier to weld the intermediate elements 11 with the strips B. By way of example, as can be seen in FIG. 3, the height hz of a rib 15, ie its dimension in the third direction Z, may be of the order of 0.30 mm. Similarly, the width lx of a rib 15, ie its dimension in the first direction X, may be of the order of 0.5 mm. In addition, the height h, of the intermediate element 11 between two ribs 15 located on the same side face 111 respectively in the extension of the upper face Is and the lower face lli, corresponding to the dimension along the third direction Z between these two ribs 15, may be of the order of 3.20 mm. Finally, the width I of an intermediate element 11 comprising two opposite ribs 15 on the lateral faces 111, corresponding to the dimension along the first direction X of the intermediate element 11 comprising two ribs 15, may be of the order of 11 mm.

Referring now to Figures 6 to 9, there is illustrated a second alternative embodiment of the invention.

As previously, a plurality of strips B is made by extrusion of a polymeric material, and these strips B are then corrugated by heat deformation.

However, in this example, as is apparent from FIGS. 6, 7 and 8, each strip B has, at each of its ends situated respectively at the level of the first edge 4 and the second edge 6 of the heat exchange plate 2, a assembly element 12 in the form of a hollow end box 12, formed by overmolding and inside which open the channels 5 for the circulation of the first fluid.

The end boxes 12 allow the assembly of the heat exchange plates 2 for the heat exchange device 10 in the manner of a set of Lego®, by embedding the end boxes 12 on each other, and this in a sealed manner.

To do this, as shown in FIG. 6, each hollow end box 12 may comprise open lateral faces 18, extending perpendicularly to the plane P, and closed upper and lower faces 19, extending along the plane P , to allow a flow of the first fluid in the second direction Y.

Alternatively, as shown in FIG. 7, each hollow end box 12 may comprise closed lateral faces 18, extending perpendicularly to the plane P, and upper and lower faces 19 open, extending along the plane P, to allow a flow of the first fluid in a third vertical direction Z, the first X, second Y and third Z directions forming a direct trihedron.

After assembly of the heat exchange plates 2 with each other thanks to the recesses of the hollow end boxes 12, liquid inlet / outlet boxes of the complete heat exchanger can be positioned and secured in a sealed manner.

In the example of Figure 6, the first liquid flows in the flow axis of the second liquid. In the example of Figure 7, the first liquid flows perpendicular to the flow axis of the second liquid.

To enable assembly, each hollow end box 12 comprises, on a first face, a male connecting rib 20 and, on a second face opposite to the first face, a female assembly groove 21, the assembly a male connector rib 20 of a first hollow end box 12 with a female connector groove 21 of a second hollow end box 12 for assembling the first and second end boxes 12 , and thus the assembly of a plurality of strips B between them to form heat exchange plates 2.

FIG. 8 represents the heat exchange device 10 obtained with hollow end boxes 12 according to the principle of FIG. 6, either with boxes or manifolds 12 overmolded in the flow axis of the second liquid. In the same way, the assembly could be assembled in a configuration with collectors 12 perpendicular to the flow axis of the second liquid. The sealed assembly can be made by gluing with a glue adapted to the polymer used for the end boxes 12.

It should be noted that the fluid flowing in the plates 2 is for example a liquid, a gas or a liquid / gas mixture. The fluid flowing in the second direction Y is for example a gas or a mixture of gases, such as air or a liquid.

The operation of the heat exchange device 10 will now be described. A first fluid is circulated in the microchannels 5 via supply and discharge manifolds, the supply manifold being connected to a source of first fluid and the exhaust manifold being connected for example to a storage area. of this first fluid. A pump is for example implemented to ensure the circulation of the first fluid. The exhaust manifold can be connected to the supply manifold to circulate the first fluid in closed circuit in the plates 2.

Simultaneously, the second fluid, for example air, circulates between the strips B of the plates 2, for example by forced convection by means of a fan. The first fluid exchanges by convection with the material of the strips B and the bands B exchange by convection with the air.

Due to the tortuosity of the microchannels 5, the heat exchanges are favored between the first fluid and the material of the B-strips. Due to the very large surface of heat exchange, and the interruption of the boundary layers on the edges of the attack of each band, the exchanges between the air and the bands B are favored compared to flat multichannel plates. In addition, the pressure drops are low for the second fluid ensuring a significant air flow. The device 10 allows very efficient heat exchange in a small footprint.

Furthermore, the strips B, made by extrusion, can be made of any polymeric materials that can be extruded, such as PVDF (Polyvinylidene Fluoride), PPO (Polyphenylene Oxide), PP (Polypropylene), CPVC (Polychlorinated vinylchloride), PA (Polyamide), PPS (Polysulfide of phenylene), PEI (Polyetherimide), PSU (Polysulfone), PBI (Polybenzidimazole), PFA 15 (Perfluoroalkoxy), PEEK (Polyetheretherketone) ), PMMA (polymethyl methacrylate). Fillers such as, for example, carbon, boron nitride, glass or carbon fibers, carbon nanotubes may be incorporated into the polymer to improve its thermal conductivity and / or mechanical strength properties.

The connecting elements 11, 12 may preferably be made of the same materials as the heat exchange plates 2 extruded.

Moreover, as can be seen in FIG. 9, the heat exchange plates 2 have a shape such that the free passage sections for the second fluid, typically air, are identical or similar, so as to avoid preferential passages. air.

Advantageously, the heat exchange plate and the heat exchange device according to the invention are of relatively simple construction, using few parts. This results in a reduced manufacturing cost compared to the plates and devices of the prior art. They are robust and offer good reliability, due to the limited number of assembled parts. In addition, they have a good modularity in that the size of the heat exchange device is easily adjustable.

Of course, the invention is not limited to the embodiments which have just been described. Various modifications may be made by the skilled person.

Claims (16)

1. Heat exchange plate (2) for a heat exchange device (10) between a first fluid and a second fluid, the heat exchange plate (2) extending in a plane (P), the heat exchange plate (2) heat exchange (2) comprising at least two strips (B, B1, B2) extending between a first edge (4) of the heat exchange plate (2) and a second edge (6) of the plate heat exchange (2), opposite the first edge (4), in a first direction (X), the strips (B, B1, B2) being arranged next to each other in a second direction (Y), perpendicular to the first direction (X), each of the strips (B, B1, B2) having at least one channel (5), in particular a plurality of channels (5), extending from the first edge (4) to the second edge ( 6) and opening into the first edge (4) and the second edge (6), said at least one channel (5) being intended for the circulation of a first fluid, said strips (B, B1, B2) each having a full ripple vertexes (9) and recesses (7), two directly adjacent strips (B, B1, B2) being arranged relative to one another so that a vertex (9) of a band (Bl) and a vertex (9) of the directly adjacent strip (B2) are offset in the first direction (X) and so that, in the second direction (Y), the vertex (9) of a strip ( Bl) and the recess (7) of the directly adjacent strip (B2) define circulation paths (C1, C2) of a second fluid, characterized in that the heat exchange plate (2) comprises at least one element assembly (11, 12) on each of its first (4) and second (6) edges, secured to said at least two strips (B, B1, B2) for assembling the heat exchange plate (2) with one or more other heat exchange plates (2) within the heat exchange device (10). 2. Heat exchange plate according to claim 1, characterized in that each strip (B, B1, B2) has a honeycomb structure, having two substantially parallel walls forming the upper (Bs) and lower (Bi) sides of the strip. (B, B1, B2), extending in the first direction (X), and a plurality of internal partitions (23), substantially parallel to each other and perpendicular to the two walls (Bs, Bi), connecting the walls between they, so as to define a plurality of microchannels (5), each channel (5) forming a cell corresponding to the space between two successive partitions (23) and the two walls (Bs, Bi). 3. heat exchange plate according to claim 1 or 2, characterized in that each strip (B, B1, B2) comprises a first flat portion (13) forming at least partly the first edge (4) of the plate d heat exchange (2) and a second flat portion (14) forming at least partly the second edge (6) of the heat exchange plate (2), each of the first (4) and second (6) edges of the heat exchange plate (2) comprising at least one connecting element (11), in particular a single connecting element (11) extending over the entire edge (4, 6), respectively secured to the first (13) and second (14) planar portions of each band (B, B1, B2). 4. heat exchange plate according to one of the preceding claims, characterized in that said at least one connecting element (11) forms an intermediate assembly element (11) intended to be positioned between two exchange plates thermal (2) of the heat exchange device (10), said at least one connecting element (11) having an upper face (They) extending in the plane (P), intended to be secured to a first plate heat exchange (2), in particular by welding, and a lower face (Ili) extending in the plane (P), intended to be secured to a second heat exchange plate (2), in particular by welding, intended to be in contact with the first heat exchange plate (2). 5. Heat exchange plate according to any one of the preceding claims, characterized in that said at least one connecting element (11) comprises, on at least one of its two side faces (111) extending perpendicular to the plane (P), at least one rib (15) extending perpendicular to the lateral face (111) and along the entire length of the lateral face (111) in the second direction (Y), in particular at least one rib (15) formed at the intersection between the lateral face (111) and the upper face (Ils), extending along the plane (P), and / or between the lateral face (111) and the lower face (Ili) extending along the plane (P) of said at least one connecting element (11) respectively in the extension along the second direction (Y) of the upper face (11) and / or of the lower face (11). ) of said at least one connecting element (11). 6. heat exchange plate according to claim 1 or 2, characterized in that each strip (B, B1, B2) has at each of its ends located respectively at the first edge (4) and the second edge (6). ) of the heat exchange plate (2), an assembly element (12) in the form of a hollow end box (12) into which the channel or channels (5) for the circulation of the first fluid, said hollow end box (12) being formed in particular by overmolding at the corresponding end of the strip (B, B1, B2). 7. heat exchange plate according to claim 6, characterized in that each hollow end box (12) has side faces (18) open, extending perpendicular to the plane (P), and upper and lower faces. (19) closed, extending along the plane (P), to allow a flow of the first fluid in the second direction (Y). 8. heat exchange plate according to claim 6, characterized in that each hollow end box (12) has closed side faces (18), extending perpendicular to the plane (P), and upper and lower faces. (19) open, extending along the plane (P), to allow a flow of the first fluid in a third vertical direction (Z), the first (X), second (Y) and third (Z) directions forming a trihedron direct. 9. heat exchange plate according to one of claims 6 to 8, characterized in that each hollow end box (12) comprises, on a first face, a male connecting rib (20) and, on a second face opposite to the first face, a female joining groove (21), assembling a male connecting rib (20) of a first hollow end box (12) with an assembly groove female (21) of a second hollow end box (12) for assembling the first and second end boxes (12), and thus assembling a plurality of strips (B, B1, B2) between them to form one or more heat exchange plates (2). 10. Heat exchange plate according to any one of the preceding claims, characterized in that each strip (B, B1, B2) is made of a polymeric material and manufactured by extrusion and shaping. 11. Heat exchange plate according to any one of the preceding claims, characterized in that all the bands (B, B1, B2) have the same undulation, the corrugations of two adjacent bands (B1, B2) being out of phase, the phase-shift being such that a trough (7) of a band (B1) is aligned with a vertex (9) of the adjacent band (B2) in the second direction (Y), the general profile of the undulation of the bands ( B, B1, B2) being a sinusoidal curve. 12. Heat exchange plate according to any one of claims 1 to 10, characterized in that all the strips (B, B1, B2) have the same undulation, the corrugations of two adjacent strips (B1, B2) being out of phase. , the phase shift being such that a trough (7) of a band (B1) is aligned with a vertex (9) of the adjacent band (B2) in the second direction (Y), the general profile of the undulation of bands (B, B1, B2) being in an arc of a circle, comprising a juxtaposition of elementary curves in the form of "S", each formed by the union of two semi-circles inverted with respect to each other. 13. Heat exchange device (10), characterized in that it comprises at least one heat exchange plate (2) according to any one of the preceding claims. 14. A method of manufacturing a heat exchange plate (2) according to any one of claims 1 to 12, characterized in that it comprises the following steps: a) extrusion production of strips (B, B, B); B2) provided with at least one channel (5), b) shaping of each strip (B, B1, B2) by hot deformation so as to form a corrugation of the strip making it possible to obtain an embossed strip c) attaching at least one connecting element (11, 12) at each end of each strip (B, B1, B2) to enable heat exchange plates (2) to be joined to each other. 15. The method of claim 14, characterized in that said at least one connecting element (11) forms an intermediate assembly element (11) positioned between two heat exchange plates (2) of the heat exchange device. (10), the heat exchange plates (2) and said at least one intermediate assembly element (11) being joined together by welding. 16. The method of claim 14, characterized in that said an assembly element (12) forms a hollow end box (12) inside which open the channel or channels (5) intended for the circulation of the first fluid, formed by overmolding at the ends of each band (B, B1, B2).