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EP2376860B1 - Heat exchanger with welded plates - Google Patents

Heat exchanger with welded plates Download PDF

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Publication number
EP2376860B1
EP2376860B1 EP09802172.8A EP09802172A EP2376860B1 EP 2376860 B1 EP2376860 B1 EP 2376860B1 EP 09802172 A EP09802172 A EP 09802172A EP 2376860 B1 EP2376860 B1 EP 2376860B1
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EP
European Patent Office
Prior art keywords
plates
plate
exchanger according
edges
angle irons
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09802172.8A
Other languages
German (de)
French (fr)
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EP2376860A1 (en
Inventor
Gérard MALUGANI
Jean-Michel Cadoret
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Vitherm SAS
Original Assignee
Vitherm SAS
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Publication date
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Publication of EP2376860A1 publication Critical patent/EP2376860A1/en
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Publication of EP2376860B1 publication Critical patent/EP2376860B1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness

Definitions

  • the subject of the invention is a heat exchanger with welded plates. It also relates to a plate intended to be used in this exchanger.
  • the invention relates to the technical field of heat exchangers made by the juxtaposition of plates welded together and defining cold fluid circuits and hot interpenetrating according to the preamble of claim 1.
  • WO93 / 22608 describes such a heat exchanger.
  • Plate heat exchangers are well known to those skilled in the art. These exchangers generally ensure the transfer of frigories or calories between a cold fluid and a hot fluid, without said fluids come into contact. For example, these exchangers can be used to ensure the condensation of steam by contacting a cold source. Such exchangers are for example disclosed in the patent documents WO 93/22608 (FERNANDEZ ) and FR 2.562.997 (VICARB ).
  • the exchanger described in the document WO 93/22608 includes (the references in parentheses apply to this document) a closed enclosure within which are arranged ribbed welded plates (1, 18, 19) defining between them interpenetrating independent circuits in which are intended to to circulate fluids.
  • the plaques (1, 18, 19) are welded together in two cassette form.
  • the side walls (39) delimiting the enclosure, are fixed on vertical spars (10) inserted in gutters (16).
  • the plates (1) are directly welded to one face of the gutters (16).
  • the plates (18, 19) are welded to lights (25) made on a vertical wall (24) joining two gutters (16).
  • the method of fixing the plates (1, 18, 19) described in the document WO 93/22608 has a number of disadvantages.
  • the first embodiment there are important mounting constraints because the plates (1, 18, 19) must be perfectly positioned on the gutters (16) and be welded with great precision.
  • the welds take all the mechanical stresses and significant thermal expansions, so that these welds can quickly break and generate sealing problems (and therefore a drop in the efficiency of the exchanger) between the two fluid circuits.
  • these welds are directly exposed to fluids circulating in the device.
  • the use of the vertical walls (24) unnecessarily increases the size of the enclosure.
  • VICARB The document FR 2.562.997 (VICARB ) describes an exchanger (the references in parentheses apply to this document) consisting of ribbed plates (20) stacked inside a closed enclosure. These plates (20) are held juxtaposed one above the other by welding and stiffened by means of four longitudinal rigid longitudinal members (3) supporting the lateral walls (5, 6, 7, 8) of the pregnant. These side walls form (5, 6, 7, 8), in association with the longitudinal members (3), independent chambers for each of the fluids. Each plate (20) comprises ribs configured so as to form, during their stacking, independent and interpenetrating conduits, in which the hot and cold fluids circulate.
  • the plates (20) comprise in each corner, a vertical edge (25, 26, 27, 28) for fixing them, by welding, on the longitudinal members (3).
  • the method of fixing the plates (20) described in the document FR 2.562.997 also has many disadvantages.
  • the first is that the formation of the vertical ridges (25, 26, 27, 28) requires a specific stamping of the plates (20) made so that the edges are turned alternately in the opposite direction of 90 ° to form said edges. This particular shape makes it difficult to weld the plates (20) together.
  • a second disadvantage lies in the fact that the plates (20) must have limited surfaces (in practice at best 75 cm x 75 cm) so that said plates and the side walls (5, 6, 7, 8) of the enclosure do not undergo too much pressure which could degrade the rigidity and mechanical strength of the exchanger.
  • the main technical problem that the invention aims to solve is to improve the assembly and maintenance of the plates inside the enclosure.
  • Another object of the invention is to provide a heat exchanger making the design simpler than that of known exchangers of the prior art.
  • Yet another object of the invention is to propose an exchanger which can have a greater exchange surface than that of the exchanger described in FIG. patent document FR 2,562,997 (VICARB ), while ensuring the rigidity of the plates and the mechanical strength of the assembly.
  • the solution proposed by the invention is a heat exchanger comprising a closed chamber inside which are arranged ribbed welded plates defining between them interpenetrating independent circuits in which are intended to circulate fluids; the lateral walls delimiting said enclosure being fixed on vertical spars, the latter being inserted into said brackets.
  • the heat exchanger which is the subject of the invention is remarkable in that the plates comprise in each corner an edge fitting into slots made on angles of vertical angles,
  • corner angles adapted to receive the edges of the plates improves the assembly and maintenance of said plates together. Indeed, the establishment of the plates in the corner angle lights, which are independent of the side members, is simpler than welding said plates directly on said side members. In addition, there are fewer mounting constraints since in the prior art, the longitudinal members must receive not only the plates, but also the side walls forming the enclosure. It is now the corner angles, and no longer the spars, which ensure the separation of fluids between the two circuits. In addition, the thermal and mechanical stresses are now applied to the corner angle lights that can absorb large expansions and pressures, without compromising the tightness of the assembly. Another advantage resulting from the invention is that corner angles now ensure the sheathing and the protection of the side members, which facilitates the design and improves the rigidity and mechanical strength of the exchanger.
  • Another aspect of the invention relates to plates for use in the exchanger according to the characteristics described above.
  • the heat exchanger which is the subject of the invention is of the type comprising a closed enclosure inside which are arranged rib-shaped plates defining between them interpenetrating independent circuits in which fluids are intended to circulate, the lateral walls delimiting said enclosure being attached to vertical spars.
  • This type of exchanger is of the type known to those skilled in the art.
  • the exchanger has the general shape of a parallelepiped whose dimensions depend essentially on the number of stacked plates and the dimensions of the latter.
  • this exchanger comprises one (or more) module (s) 1 of juxtaposed plates 40 of substantially parallelepipedal shape, incrissa (s) on four vertical spars 10 arranged at four corners.
  • the number of modules 1 used is dependent on the flow rate of the fluids to be treated.
  • the longitudinal members 10se are in the form of metal columns, hollow or solid, of substantially rectangular section whose dimensions are variable depending on the operating pressure, for example about 10 cm x 10 cm. Their length corresponds substantially to the height of the module (s) 1.
  • Lateral walls 20, 21, 22, 23 are fixed on the vertical longitudinal members 10 so as to form an enclosure around the module 1.
  • These side walls 20, 21, 22, 23 are preferably metal panels of a few millimeters to several centimeters in length. thickness according to fluid pressures circulating in the exchanger.
  • fixing the walls 20, 21, 22, 23 on the longitudinal members 10 is advantageously by means of screws 200, bolts or in any other manner suitable to those skilled in the art.
  • the side walls 20, 21, 22, 23 form, in association with the longitudinal members 10 and the module 1, independent lateral chambers, respectively 202, 212, 222, 232, in which the fluids circulate.
  • a first fluid will flow through the module 1, between the chamber 202 and the chamber 222 and the second fluid will flow through the module 1, between the chamber 212 and the chamber 232.
  • other directions of circulation suitable for the Those skilled in the art can be envisaged according to the fluids to be treated.
  • each of the walls 20, 21, 22, 23, is provided with an orifice, respectively 201, 211, 221, 231, intended for the passage of a pipe connecting the inlet and the outlet of each; fluids circulating in the exchanger.
  • one wall it is possible for one wall to be provided both with the inlet and the outlet of a first fluid and another wall to be provided with the inlet and the outlet of the second fluid, the other walls having no orifice.
  • the enclosure of the exchanger is provided with an upper cover 30 and a lower bottom 31 sealingly cooperating with the side walls 20, 21, 22, 23 to close said enclosure.
  • the lid 30 is equipped with orifices 300 for purging air and the bottom 31 is equipped with orifices 310 for purging the fluids.
  • the orifices 300 of the cover 30 are positioned vis-à-vis the side chambers 202, 212, 222, 232 so that air can be properly expelled from the latter during filling of the exchanger.
  • the openings 301 of the bottom 31 are also positioned opposite the lateral chambers 202, 212, 222, 232 so that the fluids can flow completely out of these during the purge of the exchanger.
  • the module 1 is made by means of ribbed plates 40 mounted by superposing and alternating, in the manner of a millefeuille.
  • each plate 40 has ribs 400 configured so as to form, during the stacking of the plates, independent and interpenetrating conduits, in which the hot and cold fluids circulate.
  • the geometry of the ribs 400 is well known to those skilled in the art and will not be detailed in more detail in the present description.
  • the plates 40 are generally rectangular or square. Their number depends on the service conditions and their dimensions vary from 20 cm x 20 cm to 2 mx 2 m or more. For large flows and large heat capacities, several modules 1 of plates 40 will be arranged in parallel.
  • the plates 40 are made from embossable metals such as: stainless steel, titanium, nickel, Hastellogs®, etc. They are welded alternately so as to alternately form open faces and closed faces.
  • the plates 40 comprise in each corner an edge 41, preferably horizontal.
  • This horizontal edge 41 can have the shape of a square (for example L-shaped or V-shaped) oriented towards the inside of the plate 40 ( Figures 9a and 9d ), have a bevel shape ( figure 9b ) or have a circular shape oriented towards the inside of said plate ( Figure 9c ), or any other form suitable to those skilled in the art.
  • Their width varies, in practice, from a few millimeters to a few centimeters, their thickness being that of the plates 40.
  • the ridges 41 can be easily obtained during stamping of the plates 40.
  • These edges 41 can be located only at the corners of the corners. plates 40 or extend on opposite edges of said plates, or even be present on their entire periphery.
  • the edges 41 have their edges offset in space, that is to say that the edges are in two different but parallel planes.
  • a first edge of the edges 41 is in a first plane P1 located below the ribs 400 and the second edge, perpendicular to said first edge, is in a second plane P2 located above said ribs.
  • the horizontal ridges 41 are designed to fit into horizontal slots 600 made on angles of vertical angles 60.
  • the vertical side members 10 are then inserted into these angles 60.
  • these latter are in the form of one-piece metal profiles, for example obtained by folding or stamping, and having a central portion whose shape substantially corresponds to the general shape of the edges 41, that is to say having a shape of square, bevel, circular or other.
  • the horizontal lights 600 are formed at the central angular (or beveled or circular) angles 60, said lights being parallel to each other and arranged one above the other.
  • each light 600 extends on either side of the central portion of the angles 60.
  • This type of light 600 is particularly intended to receive plates 40 as shown in FIG. figure 1a .
  • each light 600 is extended only on one side of the central part of the brackets 60, said slots being staggered, that is to say present alternately on one side or the other of said central portion.
  • This type of light 600 is particularly intended to receive plates 40 as represented on the figure 1 b. It may however be noted that the plates 40 represented on the figure 1b can also be positioned in the angles 60 represented on the Figures 5a and 5b .
  • edges of the edges 41 being offset in space, they will fit alternately in the lights 600, but only on one side or the other of the central portion of the angles 60. The portion of the lights 600 that will not receive not the edges of the edges 41 will then be closed, for example by welding.
  • Each light 600 is in fact intended to receive two edges 41 which are superimposed following the juxtaposition of two plates 40 ( figure 7 ).
  • the lights 600 have, in principle, a thickness equal to the thickness of two ridges 41 superimposed, or slightly higher, to facilitate the casing.
  • the lights 600 are sized to receive exactly the edges 41, a game being preferably provided to facilitate nesting.
  • solder cords 70 are thus produced in line with the lumens 600. These welds 70 not only seal the plates 40 at its corners, but also the mechanical connection between said plates and the corner angles 60 to realize a rigid module 1.
  • the vertical weld bead inside the corner angles 60 along their angular central portion (or beveled or circular).
  • use will preferably be angle corners 60 as shown on the Figures 5b and 5c , that is to say having a longitudinal slot 601 in their angular central portion (or beveled or circular).
  • the vertical weld seam sealing between the fluid circuits will be formed in this longitudinal slot 601, outside of said fluid circuits.
  • this solution is particularly advantageous in the case where the fluids are aggressive.
  • the welding operations generate projections likely to affect the material of the plates 40 and generate corrosion primers in the exchange zone.
  • the solution consisting in making the welds outside the fluid circuits makes it possible to remedy this state of affairs by protecting the plates 40 and preserving the exchange zone.
  • the vertical corner angles 60 are intended to receive the vertical longitudinal members 10.
  • the brackets 60 therefore have in practice a profile complementary to that of the longitudinal members 10. It may be advantageous to provide the sides of the corner pieces 60 of fins verticals 6000 ( Figures 5a, 5b and 5c ) configured to maintain the longitudinal members 10 within said brackets.
  • a seal 80 made of PTFE or graphite, is disposed between the side walls 20, 21, 22, 23 of the enclosure and the portion of the brackets 60 facing said walls. In this way, when the side walls 20, 21, 22, 23 are fixed to the longitudinal members 10, the joints 80 are crushed and ensure the sealing of the chambers 20, 21, 22, 23.
  • the vertical fins 6000 also define the range joints 80.
  • the edges of said plates are preferably provided with one or more horizontal edges 42 additional.
  • These additional horizontal edges 42 may have the shape of a U oriented towards the inside of the plate 40 ( figure 9d ) or have a circular shape (semicircle) oriented towards the inside of said plate, or any other form suitable to those skilled in the art. They have the same width and the same thickness as the corner edges 41. The additional edges 42 are easily obtained during the stamping of the plates 40.
  • the additional ridges 42 are intended to fit into horizontal slots 900 made on additional vertical angles 90. Additional longitudinal members 91 are then inserted into these additional angles 90.
  • these additional angles 90 are in the form of one-piece metal profiles, having substantially the general shape of the additional edges 42, that is to say having a U-shaped, circular or other.
  • the lights 900 are parallel to each other, arranged one above the other and have the same thickness as that of the lights 600. In practice, the lights 900 are sized to receive exactly the additional edges 42 , a game being preferably provided to facilitate nesting.
  • welding beads 901 are made in line with 900 lights to ensure the mechanical connection between the plates 40 and additional angles 90. It is also possible, but not necessary, to produce a vertical weld bead along at least one of the outer edges of each additional angle 90, at the plates 40.
  • the additional vertical angles 90 are intended to receive the additional vertical spars 91.
  • the additional angles 90 are therefore in practice a profile complementary to that of the longitudinal members 91. It may be advantageous to provide the sides of the angle 90 fins verticals 9000 ( figure 6 ) configured to maintain the longitudinal members 91 within said brackets.
  • the enclosure of the exchanger may be closed by two lateral walls, respectively 20a-20b, 21a-21b, 22a-22b and 23a-23b, each attached to a longitudinal spar. 10 and an additional vertical beam 91 by means of screws 200, bolts or any other manner suitable to the skilled person.
  • a seal 80 made of PTFE or graphite, is disposed between the side walls of the enclosure and the portion of the additional angles 90 vis-a-vis said walls.
  • the vertical vanes 9000 also define the range of the joints 80.
  • the side walls 20a, 20b, 21a, 21b, 22a, 22b, 23a, 23b are metal plates having a thickness ranging from 50 mm to 200 mm depending on the fluid pressure. Without additional ridges 42 and additional angles 90, it would be necessary to provide one-piece side walls connecting each corner angle, said walls having to have a greater thickness to withstand the pressure of the fluids. The technical solution proposed by the invention therefore significantly reduces the thickness of the side walls of the exchanger.
  • Additional ridges 42 and additional angles 90 may also be provided on reduced or standard exchangers, for example exchangers composed of plates 40 having a length of about 30 cm, but subjected to significant pressures (of the order from 35 bar to 40 bar). This design will contribute to the rigidity of the assembly by avoiding that the plates are disconnected locally from each other under the effect of pressure.

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  • 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)

Description

Domaine technique de l'invention.Technical Field of the Invention

L'invention a pour objet un échangeur thermique à plaques soudées. Elle concerne également une plaque destinée à être utilisée dans cet échangeur.The subject of the invention is a heat exchanger with welded plates. It also relates to a plate intended to be used in this exchanger.

L'invention concerne le domaine technique des échangeurs thermiques réalises par la juxtaposition de plaques soudées entre elles et définissant des circuits de fluide froid et chaud s'interpénétrant, selon le prémbule de la revendication 1. WO93/22608 décrit un tel échangeur thermique.The invention relates to the technical field of heat exchangers made by the juxtaposition of plates welded together and defining cold fluid circuits and hot interpenetrating according to the preamble of claim 1. WO93 / 22608 describes such a heat exchanger.

État de la technique.State of the art

Les échangeurs thermiques à plaques sont bien connus de l'homme du métier. Ces échangeurs assurent généralement le transfert de frigories ou de calories entre un fluide froid et un fluide chaud, sans que lesdits fluides rentrent en contact. Par exemple, ces échangeurs peuvent servir à assurer la condensation de vapeur par une mise en contact avec une source froide. De tels échangeurs sont par exemple divulgués dans les documents brevets WO 93/22608 (FERNANDEZ ) et FR 2.562.997 (VICARB ).Plate heat exchangers are well known to those skilled in the art. These exchangers generally ensure the transfer of frigories or calories between a cold fluid and a hot fluid, without said fluids come into contact. For example, these exchangers can be used to ensure the condensation of steam by contacting a cold source. Such exchangers are for example disclosed in the patent documents WO 93/22608 (FERNANDEZ ) and FR 2.562.997 (VICARB ).

L'échangeur décrit dans le document WO 93/22608 (FERNANDEZ ) comporte (les références entre parenthèses s'appliquent à ce document) une enceinte fermée à l'intérieur de laquelle sont agencées des plaques (1, 18, 19) soudées nervurées définissant entre elles des circuits indépendants s'interpénétrant dans lesquels sont destinés à circuler des fluides. Les plaques (1, 18, 19) sont soudées par deux sous forme de cassette. Les parois latérales (39) délimitant l'enceinte, sont fixées sur des longerons verticaux (10) s'insérant dans des gouttières (16). Dans un premier mode de réalisation, les plaques (1) sont directement soudées sur une face des gouttières (16). Dans un second mode de réalisation, les plaques (18, 19) sont soudées sur des lumières (25) réalisées sur une paroi verticale (24) réunissant deux gouttières (16).The exchanger described in the document WO 93/22608 (FERNANDEZ ) includes (the references in parentheses apply to this document) a closed enclosure within which are arranged ribbed welded plates (1, 18, 19) defining between them interpenetrating independent circuits in which are intended to to circulate fluids. The plaques (1, 18, 19) are welded together in two cassette form. The side walls (39) delimiting the enclosure, are fixed on vertical spars (10) inserted in gutters (16). In a first embodiment, the plates (1) are directly welded to one face of the gutters (16). In a second embodiment, the plates (18, 19) are welded to lights (25) made on a vertical wall (24) joining two gutters (16).

La méthode de fixation des plaques (1, 18, 19) décrite dans le document WO 93/22608 (FERNANDEZ ) comporte un certain nombre d'inconvénients. Dans le premier mode de réalisation, il y a d'importantes contraintes de montage car les plaques (1, 18, 19) doivent être parfaitement positionnées sur les gouttières (16) et être soudées avec une grande précision. En outre, les soudures encaissent toutes les contraintes mécaniques et des dilatations thermiques importantes, de sorte que ces soudures peuvent rapidement rompre et générer des problèmes d'étanchéité (et donc une baisse du rendement de l'échangeur) entre les deux circuits de fluides. En outre, ces soudures sont directement exposées aux fluides circulant dans l'appareil. Dans le second mode de réalisation, l'utilisation des parois verticales (24) augmente inutilement l'encombrement de l'enceinte.The method of fixing the plates (1, 18, 19) described in the document WO 93/22608 (FERNANDEZ ) has a number of disadvantages. In the first embodiment, there are important mounting constraints because the plates (1, 18, 19) must be perfectly positioned on the gutters (16) and be welded with great precision. In addition, the welds take all the mechanical stresses and significant thermal expansions, so that these welds can quickly break and generate sealing problems (and therefore a drop in the efficiency of the exchanger) between the two fluid circuits. In addition, these welds are directly exposed to fluids circulating in the device. In the second embodiment, the use of the vertical walls (24) unnecessarily increases the size of the enclosure.

Le document FR 2.562.997 (VICARB ) décrit un échangeur (les références entre parenthèses s'appliquent à ce document) constitué de plaques (20) nervurées empilées à l'intérieur d'une enceinte close. Ces plaques (20) sont maintenues juxtaposées l'une au-dessus de l'autre par soudage et rigidifié par l'intermédiaire de quatre longerons (3) longitudinaux rigides supportant les parois latérales (5, 6, 7, 8) de l'enceinte. Ces parois latérales forment (5, 6, 7, 8), en association avec les longerons (3), des chambres indépendantes pour chacun des fluides. Chaque plaque (20) comporte des nervures configurées de manière à former, lors de leur empilement, des conduits indépendants et s'interpénétrant, dans lesquels circulent les fluides chaud et froid. Les plaques (20) comportent dans chaque angle, une arête verticale (25, 26, 27, 28) permettant de les fixer, par soudage, sur les longerons (3).The document FR 2.562.997 (VICARB ) describes an exchanger (the references in parentheses apply to this document) consisting of ribbed plates (20) stacked inside a closed enclosure. These plates (20) are held juxtaposed one above the other by welding and stiffened by means of four longitudinal rigid longitudinal members (3) supporting the lateral walls (5, 6, 7, 8) of the pregnant. These side walls form (5, 6, 7, 8), in association with the longitudinal members (3), independent chambers for each of the fluids. Each plate (20) comprises ribs configured so as to form, during their stacking, independent and interpenetrating conduits, in which the hot and cold fluids circulate. The plates (20) comprise in each corner, a vertical edge (25, 26, 27, 28) for fixing them, by welding, on the longitudinal members (3).

La méthode de fixation des plaques (20) décrite dans le document FR 2.562.997 (VICARB ) comporte également de nombreux inconvénients. Le premier est que la formation des arêtes verticales (25, 26, 27, 28) nécessite un emboutissage spécifique des plaques (20) réalisé de manière à ce que les bords soient retournés alternativement en sens inverse de 90° pour former lesdites arêtes. Cette forme particulière rend complexe le soudage des plaques (20) entre elles. Un second inconvénient réside dans le fait que les plaques (20) doivent avoir des surfaces limitées (en pratique au mieux 75 cm x 75 cm) de manière à ce que lesdites plaques et les parois latérales (5, 6, 7, 8) de l'enceinte ne subissent pas une pression trop importante qui risquerait de dégrader la rigidité et la résistance mécanique de l'échangeur. Un autre inconvénient majeur réside dans le fait que la liaison entre les arêtes verticales (25, 26, 27, 28) et les longerons (3) est soumise à des contraintes mécaniques et des dilatations thermiques importantes, de sorte que ces liaisons peuvent rapidement rompre et générer des problèmes d'étanchéité (et donc une baisse du rendement de l'échangeur) entre les deux circuits de fluides.The method of fixing the plates (20) described in the document FR 2.562.997 (VICARB ) also has many disadvantages. The first is that the formation of the vertical ridges (25, 26, 27, 28) requires a specific stamping of the plates (20) made so that the edges are turned alternately in the opposite direction of 90 ° to form said edges. This particular shape makes it difficult to weld the plates (20) together. A second disadvantage lies in the fact that the plates (20) must have limited surfaces (in practice at best 75 cm x 75 cm) so that said plates and the side walls (5, 6, 7, 8) of the enclosure do not undergo too much pressure which could degrade the rigidity and mechanical strength of the exchanger. Another major disadvantage lies in the fact that the connection between the vertical edges (25, 26, 27, 28) and the longitudinal members (3) is subjected to mechanical stresses and significant thermal expansion, so that these links can quickly break and generating sealing problems (and therefore a decrease in the efficiency of the exchanger) between the two fluid circuits.

Face à cet état des choses, le problème technique principal que vise à résoudre l'invention est d'améliorer l'assemblage et le maintien des plaques à l'intérieur de l'enceinte.Faced with this state of affairs, the main technical problem that the invention aims to solve is to improve the assembly and maintenance of the plates inside the enclosure.

Un autre objectif de l'invention est de proposer un échangeur thermique rendant la conception plus simple que celle des échangeurs connus de l'art antérieur.Another object of the invention is to provide a heat exchanger making the design simpler than that of known exchangers of the prior art.

Encore un autre objectif de l'invention est de proposer un échangeur pouvant avoir une surface d'échange supérieure à celle de l'échangeur décrit dans le document brevet FR 2.562.997 (VICARB ), tout en assurant la rigidité des plaques et la résistance mécanique de l'ensemble.Yet another object of the invention is to propose an exchanger which can have a greater exchange surface than that of the exchanger described in FIG. patent document FR 2,562,997 (VICARB ), while ensuring the rigidity of the plates and the mechanical strength of the assembly.

Divulgation de l'invention.Disclosure of the invention.

La solution proposée par l'invention est un échangeur thermique comportant une enceinte fermée à l'intérieur de laquelle sont agencées des plaques soudées nervurées définissant entre elles des circuits indépendants s'interpénétrant dans lesquels sont destines à circuler des fluides ; les parois latérales délimitant ladite enceinte étant fixées sur des longerons verticaux, ces derniers étant insérés dans lesdites cornières. L'échangeur objet de l'invention est remarquable en ce que les plaques comportent dans chaque angle une arête venant s'emboîter dans des lumières réalisées sur des cornières d'angles verticales,The solution proposed by the invention is a heat exchanger comprising a closed chamber inside which are arranged ribbed welded plates defining between them interpenetrating independent circuits in which are intended to circulate fluids; the lateral walls delimiting said enclosure being fixed on vertical spars, the latter being inserted into said brackets. The heat exchanger which is the subject of the invention is remarkable in that the plates comprise in each corner an edge fitting into slots made on angles of vertical angles,

L'utilisation de cornières d'angle adaptées pour recevoir les arêtes des plaques permet d'améliorer l'assemblage et le maintien desdites plaques entre-elles. En effet, la mise en place des plaques dans les lumières des cornières d'angle, qui sont indépendantes des longerons, est plus simple que le soudage desdites plaques directement sur lesdits longerons. De plus, il y a moins de contraintes de montage puisque dans l'art antérieur, les longerons doivent recevoir non seulement les plaques, mais également les parois latérales formant l'enceinte. Ce sont désormais les cornières d'angle, et non plus les longerons, qui assurent la séparation des fluides entre les deux circuits. En outre, les contraintes thermiques et mécaniques sont maintenant appliquées au niveau des lumières des cornières d'angle qui peuvent absorber des dilatations et des pressions importantes, sans nuire à l'étanchéité de l'ensemble. Un autre avantage résultant de l'invention est que les cornières d'angle assurent maintenant le gainage et la protection des longerons, ce qui facilite la conception et améliore la rigidité et la résistance mécanique de l'échangeur.The use of corner angles adapted to receive the edges of the plates improves the assembly and maintenance of said plates together. Indeed, the establishment of the plates in the corner angle lights, which are independent of the side members, is simpler than welding said plates directly on said side members. In addition, there are fewer mounting constraints since in the prior art, the longitudinal members must receive not only the plates, but also the side walls forming the enclosure. It is now the corner angles, and no longer the spars, which ensure the separation of fluids between the two circuits. In addition, the thermal and mechanical stresses are now applied to the corner angle lights that can absorb large expansions and pressures, without compromising the tightness of the assembly. Another advantage resulting from the invention is that corner angles now ensure the sheathing and the protection of the side members, which facilitates the design and improves the rigidity and mechanical strength of the exchanger.

Un autre aspect de l'invention concerne des plaques destinées à être utilisées dans l'échangeur conforme aux caractéristiques décrites précédemment.Another aspect of the invention relates to plates for use in the exchanger according to the characteristics described above.

Description des figures.Description of the figures.

D'autres avantages et caractéristiques de l'invention apparaîtront mieux à la lecture de la description d'un mode de réalisation préféré qui va suivre, en référence aux dessins annexés, réalisés à titre d'exemples indicatifs et non limitatifs et sur lesquels :

  • la figure 1a est une vue schématique en perspective de deux plaques conformes à l'invention et destinées à être juxtaposées l'une sur l'autre,
  • la figure 1b est une vue schématique en perspective de deux plaques conformes à l'invention dans une variante de réalisation et destinées à être juxtaposées l'une sur l'autre,
  • la figure 2 est une vue schématique en perspective montrant de manière éclatée l'agencement de différents éléments constitutifs d'un échangeur conforme a l'invention,
  • la figure 3 est une vue en coupe horizontale d'un échangeur conforme à l'invention,
  • la figure 4 est une vue en coupe horizontale d'un échangeur conforme à l'invention, dans une variante de réalisation ou des plaques de grandes dimensions sont utilisées,
  • la figure 5a est une vue schématique en perspective d'un premier mode de réalisation d'une cornière d'angle,
  • la figure 5b est une vue schématique en perspective d'un second mode de réalisation d'une cornière d'angle,
  • la figure 5c est une vue schématique en perspective d'un troisième mode de réalisation d'une cornière d'angle,
  • la figure 6 est une vue schématique en perspective d'un mode de réalisation d'une cornière destinée à s'agencer au niveau des bords de plaques de grandes dimensions,
  • la figure 7 est une vue en coupe selon A-A de l'échangeur de la figure 4,
  • la figure 8 est une vue en coupe selon B-B de l'échangeur de la figure 4,
  • les figures 9a à 9d sont des vues de haut de différents modes de réalisation de plaques pouvant être utilisées dans l'échangeur objet de l'invention.
Other advantages and characteristics of the invention will appear better on reading the description of a preferred embodiment which will follow, with reference to the accompanying drawings, carried out as indicative and non-limiting examples and in which:
  • the figure 1a is a schematic perspective view of two plates according to the invention and intended to be juxtaposed one on the other,
  • the figure 1b is a schematic perspective view of two plates according to the invention in an alternative embodiment and intended to be juxtaposed one on the other,
  • the figure 2 is a schematic perspective view showing exploded the arrangement of different elements constituting an exchanger according to the invention,
  • the figure 3 is a horizontal sectional view of an exchanger according to the invention,
  • the figure 4 is a horizontal sectional view of an exchanger according to the invention, in an alternative embodiment where large plates are used,
  • the figure 5a is a schematic perspective view of a first embodiment of a corner angle,
  • the figure 5b is a schematic perspective view of a second embodiment of a corner angle,
  • the figure 5c is a schematic perspective view of a third embodiment of a corner angle,
  • the figure 6 is a schematic perspective view of an embodiment of a bracket intended to be arranged at the edges of large plates,
  • the figure 7 is a sectional view along AA of the exchanger of the figure 4 ,
  • the figure 8 is a sectional view along BB of the exchanger of the figure 4 ,
  • the Figures 9a to 9d are top views of different embodiments of plates that can be used in the exchanger object of the invention.

Modes de réalisation de l'invention.Embodiments of the invention

L'échangeur thermique objet de l'invention est du type comportant une enceinte fermée à l'intérieur de laquelle sont agencées des plaques nervurées définissant entre elles des circuits indépendants s'interpénétrant dans lesquels sont destines à circuler des fluides, les parois latérales délimitant ladite enceinte étant fixées sur des longerons verticaux. Ce type d'échangeur est du type connu de l'homme du métier.The heat exchanger which is the subject of the invention is of the type comprising a closed enclosure inside which are arranged rib-shaped plates defining between them interpenetrating independent circuits in which fluids are intended to circulate, the lateral walls delimiting said enclosure being attached to vertical spars. This type of exchanger is of the type known to those skilled in the art.

En se rapportant aux figures annexées et en particulier aux figures 2, 3, 4, 7 et 8, l'échangeur a la forme générale d'un parallélépipède dont les dimensions dépendent essentiellement du nombre de plaques empilées et des dimensions de ces dernières. En se rapportant à la figure 2, cet échangeur comporte un (ou plusieurs) module(s) 1 de plaques 40 juxtaposées de forme sensiblement parallélépipédique, incéré(s) sur quatre longerons verticaux 10 disposés aux quatre angles. Le nombre de modules 1 utilisé est dépendant du débit des fluides à traiter. Les longerons 10se présentent sous la forme de poteaux métalliques, creux ou pleins, de section sensiblement rectangulaire dont les dimensions sont variables suivant la pression de service, par exemple d'environ 10 cm x 10 cm. Leur longueur correspond sensiblement à la hauteur du ou des module(s) 1.Referring to the attached figures and in particular to figures 2 , 3 , 4 , 7 and 8 , the exchanger has the general shape of a parallelepiped whose dimensions depend essentially on the number of stacked plates and the dimensions of the latter. By referring to the figure 2 this exchanger comprises one (or more) module (s) 1 of juxtaposed plates 40 of substantially parallelepipedal shape, incéré (s) on four vertical spars 10 arranged at four corners. The number of modules 1 used is dependent on the flow rate of the fluids to be treated. The longitudinal members 10se are in the form of metal columns, hollow or solid, of substantially rectangular section whose dimensions are variable depending on the operating pressure, for example about 10 cm x 10 cm. Their length corresponds substantially to the height of the module (s) 1.

Des parois latérales 20, 21, 22, 23 sont fixées sur les longerons verticaux 10 de manière à former une enceinte autour du module 1. Ces parois latérales 20, 21, 22, 23 sont préférentiellement des panneaux métalliques de quelques millimètres à plusieurs centimètres d'épaisseur selon les pressions des fluides circulant dans l'échangeur. Comme schématisée sur les figures 3 et 4, la fixation des parois 20, 21, 22, 23 sur les longerons 10 se fait avantageusement au moyen de vis 200, de boulons ou de toute autre manière convenant à l'homme du métier. En se rapportant à la figure 3, les parois latérales 20, 21, 22, 23 forment, en association avec les longerons 10 et le module 1, des chambres latérales indépendantes, respectivement 202, 212, 222, 232, dans lesquelles circulent les fluides. Dans l'exemple de réalisation représenté sur la figure 3, un premier fluide circulera au travers du module 1, entre la chambre 202 et la chambre 222 et le second fluide circulera au travers du module 1, entre la chambre 212 et la chambre 232. Toutefois, d'autres sens de circulation convenant à l'homme du métier pourront être envisagés selon les fluides à traiter.Lateral walls 20, 21, 22, 23 are fixed on the vertical longitudinal members 10 so as to form an enclosure around the module 1. These side walls 20, 21, 22, 23 are preferably metal panels of a few millimeters to several centimeters in length. thickness according to fluid pressures circulating in the exchanger. As schematized on figures 3 and 4 , fixing the walls 20, 21, 22, 23 on the longitudinal members 10 is advantageously by means of screws 200, bolts or in any other manner suitable to those skilled in the art. By referring to the figure 3 , the side walls 20, 21, 22, 23 form, in association with the longitudinal members 10 and the module 1, independent lateral chambers, respectively 202, 212, 222, 232, in which the fluids circulate. In the exemplary embodiment shown on the figure 3 a first fluid will flow through the module 1, between the chamber 202 and the chamber 222 and the second fluid will flow through the module 1, between the chamber 212 and the chamber 232. However, other directions of circulation suitable for the Those skilled in the art can be envisaged according to the fluids to be treated.

En se rapportant aux figures 2, 3, 4, 7 et 8, chacune des parois 20, 21, 22, 23, est pourvue d'un orifice, respectivement 201, 211, 221, 231, destiné au passage d'une conduite de raccordement de l'entrée et de la sortie de chacun ; des fluides circulant dans l'échangeur. Dans une variante de réalisation non représentée, il est possible qu'une paroi soit pourvue à la fois de l'entrée et de la sortie d'un premier fluide et qu'une autre paroi soit pourvue de l'entrée et de la sortie du second fluide, les autres parois n'ayant aucun orifice.By referring to figures 2 , 3 , 4 , 7 and 8 each of the walls 20, 21, 22, 23, is provided with an orifice, respectively 201, 211, 221, 231, intended for the passage of a pipe connecting the inlet and the outlet of each; fluids circulating in the exchanger. In an alternative embodiment not shown, it is possible for one wall to be provided both with the inlet and the outlet of a first fluid and another wall to be provided with the inlet and the outlet of the second fluid, the other walls having no orifice.

L'enceinte de l'échangeur est pourvue d'un couvercle supérieur 30 et d'un fond inférieur 31 coopérant de manière étanche avec les parois latérales 20, 21, 22, 23, pour fermer ladite enceinte. Selon une caractéristique avantageuse de l'invention, le couvercle 30 est équipé d'orifices 300 pour la purge d'air et le fond 31 est équipé d'orifices 310 pour la purge des fluides. En pratique, les orifices 300 du couvercle 30 sont positionnés en vis-à-vis des chambres latérales 202, 212, 222, 232 de manière à ce que l'air puisse être correctement expulsé de ces dernières lors du remplissage de l'échangeur. De même, les orifices 301 du fond 31 sont également positionnés en vis-à-vis des chambres latérales 202, 212, 222, 232 de manière à ce que les fluides puissent s'écouler totalement hors de ces dernières lors de la purge de l'échangeur.The enclosure of the exchanger is provided with an upper cover 30 and a lower bottom 31 sealingly cooperating with the side walls 20, 21, 22, 23 to close said enclosure. According to an advantageous characteristic of the invention, the lid 30 is equipped with orifices 300 for purging air and the bottom 31 is equipped with orifices 310 for purging the fluids. In practice, the orifices 300 of the cover 30 are positioned vis-à-vis the side chambers 202, 212, 222, 232 so that air can be properly expelled from the latter during filling of the exchanger. Similarly, the openings 301 of the bottom 31 are also positioned opposite the lateral chambers 202, 212, 222, 232 so that the fluids can flow completely out of these during the purge of the exchanger.

D'une manière bien connue de l'homme du métier, le module 1 est réalisé par l'intermédiaire de plaques 40 nervurées montées par superposition et alternées, à la manière d'un millefeuille. En se rapportant aux figures 1a et 1b, 1, chaque plaque 40 comporte des nervures 400 configurées de manière à former, lors de l'empilement des plaques, des conduits indépendants et s'interpénétrant, dans lesquels circulent les fluides chaud et froid. La géométrie des nervures 400 est bien connue de l'homme du métier et ne sera pas détaillée plus en détail dans la présente description. Les plaques 40 sont de forme générale rectangulaire ou carré. Leur nombre est fonction des conditions de service et leurs dimensions varient de 20 cm x 20 cm à 2 m x 2 m, voire plus. Pour des débits importants et des puissances calorifiques importantes, plusieurs modules 1 de plaques 40 seront disposés en parallèle. En pratique, les plaques 40 sont réalisées à partir de métaux emboutissables tels que : acier inoxydable, Titane, Nickel, Hastellogs®, etc. Elles sont soudées alternativement de manière à former alternativement des faces ouvertes et des faces fermées.In a manner well known to those skilled in the art, the module 1 is made by means of ribbed plates 40 mounted by superposing and alternating, in the manner of a millefeuille. By referring to figures 1a and 1b , 1, each plate 40 has ribs 400 configured so as to form, during the stacking of the plates, independent and interpenetrating conduits, in which the hot and cold fluids circulate. The geometry of the ribs 400 is well known to those skilled in the art and will not be detailed in more detail in the present description. The plates 40 are generally rectangular or square. Their number depends on the service conditions and their dimensions vary from 20 cm x 20 cm to 2 mx 2 m or more. For large flows and large heat capacities, several modules 1 of plates 40 will be arranged in parallel. In practice, the plates 40 are made from embossable metals such as: stainless steel, titanium, nickel, Hastellogs®, etc. They are welded alternately so as to alternately form open faces and closed faces.

Conformément à l'invention et en se rapportant aux figures 1a et 9a a 9d, les plaques 40 comportent dans chaque angle une arête 41, préférentiellement horizontale. Cette arête horizontale 41 peut avoir la forme d'une équerre (par exemple en forme de L ou de V) orientée vers l'intérieur de la plaque 40 (figures 9a et 9d), avoir une forme en biseau (figure 9b) ou avoir une forme circulaire orientée vers l'intérieur de ladite plaque (figure 9c), ou toute autre forme convenant à l'homme du métier. Leur largeur varie, en pratique, de quelques millimètres à quelques centimètres, leur épaisseur étant celle des plaques 40. Les arêtes 41 peuvent être facilement obtenues lors de l'emboutissage des plaques 40. Ces arêtes 41 peuvent être localisées uniquement au niveau des angles des plaques 40 ou se prolonger sur des bords opposés desdites plaques, voire être présentes sur toute leur périphérie.In accordance with the invention and with reference to figures 1a and 9a a 9d, the plates 40 comprise in each corner an edge 41, preferably horizontal. This horizontal edge 41 can have the shape of a square (for example L-shaped or V-shaped) oriented towards the inside of the plate 40 ( Figures 9a and 9d ), have a bevel shape ( figure 9b ) or have a circular shape oriented towards the inside of said plate ( Figure 9c ), or any other form suitable to those skilled in the art. Their width varies, in practice, from a few millimeters to a few centimeters, their thickness being that of the plates 40. The ridges 41 can be easily obtained during stamping of the plates 40. These edges 41 can be located only at the corners of the corners. plates 40 or extend on opposite edges of said plates, or even be present on their entire periphery.

En se rapportant à une variante de réalisation représentée sur la figure 1b, les arrêtes 41 ont leur bords décalés dans l'espace, c'est-à-dire que les bords sont dans deux plans différents mais parallèles. Par exemple, en se référant à la plaque 40 du haut de la figure 1b un premier bord des arêtes 41 se trouve dans un premier plan P1 situé en-dessous des nervures 400 et le second bord, perpendiculaire audit premier bord, se trouve dans un second plan P2 situé au-dessus desdites nervures.Referring to an alternative embodiment shown on the figure 1b , the edges 41 have their edges offset in space, that is to say that the edges are in two different but parallel planes. For example, referring to plate 40 from the top of the figure 1b a first edge of the edges 41 is in a first plane P1 located below the ribs 400 and the second edge, perpendicular to said first edge, is in a second plane P2 located above said ribs.

En se rapportant aux figures 3 à 7, les arêtes horizontales 41 sont destinées à venir s'emboîter dans des lumières horizontales 600 réalisées sur des cornières d'angles verticales 60. Les longerons verticaux 10 sont ensuite insérés dans ces cornières 60. En se référant plus particulièrement aux figures 5a, 5b et 5c, ces dernières se présentent sous la forme de profilés métalliques monoblocs, par exemple obtenues par pliage ou emboutissage, et ayant une partie centrale dont la forme correspond sensiblement à la forme générale des arêtes 41, c'est-à-dire ayant une forme d'équerre, en biseau, circulaire ou autre. Les lumières horizontales 600 sont réalisées au niveau de la partie centrale anguleuse (ou biseautée ou circulaire) des cornières 60, lesdites lumières étant parallèles entre-elles et disposées les unes au-dessus des autres.By referring to Figures 3 to 7 the horizontal ridges 41 are designed to fit into horizontal slots 600 made on angles of vertical angles 60. The vertical side members 10 are then inserted into these angles 60. Referring more particularly to Figures 5a, 5b and 5c these latter are in the form of one-piece metal profiles, for example obtained by folding or stamping, and having a central portion whose shape substantially corresponds to the general shape of the edges 41, that is to say having a shape of square, bevel, circular or other. The horizontal lights 600 are formed at the central angular (or beveled or circular) angles 60, said lights being parallel to each other and arranged one above the other.

En se rapportant aux figures 5a et 5b, chaque lumière 600 se prolonge de part et d'autre de la partie centrale des cornières 60. Ce type de lumière 600 est particulièrement destiné à recevoir des plaques 40 telles que représentées sur la figure 1a. Dans une variante de réalisation représentée sur la figure 5c, chaque lumière 600 ne se prolonge que d'un côté de la partie centrale des cornières 60, lesdites lumières étant en quinconce c'est-à-dire présentent de manière alternée d'un côté ou de l'autre de ladite partie centrale. Ce type de lumière 600 est particulièrement destinée à recevoir des plaques 40 telles que représentées sur la figure 1 b. On peut toutefois noter que les plaques 40 représentées sur la figure 1b peuvent également être positionnées dans les cornières 60 représentées sur les figures 5a et 5b. Dans ce dernier cas, les bords des arrêtes 41 étant décalés dans l'espace, ils s'emboîteront de manière alternée dans les lumières 600, mais uniquement d'un côté ou de l'autre de la partie centrale des cornières 60. La portion des lumières 600 qui ne recevra pas les bords des arêtes 41 sera alors obturée, par exemple par soudage.By referring to Figures 5a and 5b each light 600 extends on either side of the central portion of the angles 60. This type of light 600 is particularly intended to receive plates 40 as shown in FIG. figure 1a . In an alternative embodiment shown on the figure 5c each light 600 is extended only on one side of the central part of the brackets 60, said slots being staggered, that is to say present alternately on one side or the other of said central portion. This type of light 600 is particularly intended to receive plates 40 as represented on the figure 1 b. It may however be noted that the plates 40 represented on the figure 1b can also be positioned in the angles 60 represented on the Figures 5a and 5b . In the latter case, edges of the edges 41 being offset in space, they will fit alternately in the lights 600, but only on one side or the other of the central portion of the angles 60. The portion of the lights 600 that will not receive not the edges of the edges 41 will then be closed, for example by welding.

Chaque lumière 600 est en fait destinée à recevoir deux arêtes 41 qui sont superposées suite à la juxtaposition de deux plaques 40 (figure 7). Les lumières 600 ont donc, en principe, une épaisseur égale à l'épaisseur de deux arêtes 41 superposées, voire légèrement supérieure, pour faciliter l'emboîtage. En pratique, les lumières 600 sont dimensionnées de manière à recevoir exactement les arêtes 41, un jeu étant préférentiellement prévu pour faciliter l'emboîtement.Each light 600 is in fact intended to receive two edges 41 which are superimposed following the juxtaposition of two plates 40 ( figure 7 ). The lights 600 have, in principle, a thickness equal to the thickness of two ridges 41 superimposed, or slightly higher, to facilitate the casing. In practice, the lights 600 are sized to receive exactly the edges 41, a game being preferably provided to facilitate nesting.

Lorsque les arêtes 41 sont positionnées dans les lumières 600, l'extrémité desdites arêtes est à l'arase de la surface interne des cornières 60. Les extrémités des arêtes peuvent ainsi être facilement soudées dans les lumières 600. En se rapportant à la figure 3, des cordons de soudure 70 sont donc réalisés au droit des lumières 600. Ces soudures 70 assurent non seulement l'étanchéité des plaques 40 au niveau de ses angles, mais également la liaison mécanique entre lesdites plaques et les cornières d'angle 60 de manière à réaliser un module 1 rigide.When the edges 41 are positioned in the slots 600, the end of said ridges is at the base of the inner surface of the angles 60. The ends of the edges can thus be easily welded in the lights 600. Referring to the figure 3 solder cords 70 are thus produced in line with the lumens 600. These welds 70 not only seal the plates 40 at its corners, but also the mechanical connection between said plates and the corner angles 60 to realize a rigid module 1.

En se rapportant aux figures 3 et 7, on peut réaliser un cordon de soudure vertical 71 le long d'au moins un des bords externes de chaque cornière d'angle, au niveau des plaques 40, de manière à assurer une étanchéité entre les circuits de fluides, c'est-à-dire entre les différentes chambres 202, 212, 222, 232.By referring to figures 3 and 7 it is possible to produce a vertical weld bead 71 along at least one of the outer edges of each corner angle, at the level of the plates 40, so as to ensure a seal between the fluid circuits, that is to say say between the different chambers 202, 212, 222, 232.

Dans une variante de réalisation, on peut réaliser le cordon de soudure vertical à l'intérieur des cornières d'angle 60, le long de leur partie centrale anguleuse (ou biseautée ou circulaire). Pour ce faire, on utilisera préférentiellement des cornières d'angle 60 telles que représentées sur les figures 5b et 5c, c'est-à-dire comportant une lumière longitudinale 601 dans leur partie centrale anguleuse (ou biseautée ou circulaire). Le cordon de soudure vertical assurant l'étanchéité entre les circuits de fluide sera réalisé dans cette lumière longitudinale 601, à l'extérieur desdits circuits de fluides. Les soudures n'étant pas en contact direct avec les fluides, cette solution est particulièrement avantageuse dans le cas où les fluides sont agressifs. En outre, il est fréquent que les opérations de soudages engendrent des projections susceptibles d'affecter la matière des plaques 40 et générer des amorces de corrosion dans la zone d'échange. La solution consistant à réaliser les soudures à l'extérieur des circuits de fluides permet de remédier à cet état des choses en protégeant les plaques 40 et en préservant la zone d'échange.In an alternative embodiment, it is possible to produce the vertical weld bead inside the corner angles 60, along their angular central portion (or beveled or circular). To do this, use will preferably be angle corners 60 as shown on the Figures 5b and 5c , that is to say having a longitudinal slot 601 in their angular central portion (or beveled or circular). The vertical weld seam sealing between the fluid circuits will be formed in this longitudinal slot 601, outside of said fluid circuits. As the welds are not in direct contact with the fluids, this solution is particularly advantageous in the case where the fluids are aggressive. In addition, it is common that the welding operations generate projections likely to affect the material of the plates 40 and generate corrosion primers in the exchange zone. The solution consisting in making the welds outside the fluid circuits makes it possible to remedy this state of affairs by protecting the plates 40 and preserving the exchange zone.

Ce sont donc maintenant les cornières d'angle 60 qui assurent la séparation entre les deux circuits de fluides contrairement à l'échangeur décrit dans le document brevet FR 2.562.997 (VICARB ) où ce sont les longerons qui assurent cette fonction.So it is now the corner angles 60 which ensure the separation between the two fluid circuits unlike the exchanger described in the patent document FR 2.562.997 (VICARB where it is the spars that provide this function.

Comme mentionné précédemment, les cornières d'angle verticales 60 sont destinées à recevoir les longerons verticaux 10. Les cornières 60 ont donc en pratique un profil complémentaire de celui des longerons 10. Il peut être avantageux de munir les côtés des cornières 60 d'ailettes verticales 6000 (figures 5a, 5b et 5c) configurées pour maintenir les longerons 10 à l'intérieur desdites cornières. En se rapportant aux figures 3 et 7, un joint 80, en PTFE ou graphite, est disposé entre les parois latérales 20, 21, 22, 23 de l'enceinte et la partie des cornières 60 en vis-à-vis desdites parois. De cette manière, lorsque les parois latérales 20, 21, 22, 23 sont fixées sur les longerons 10, les joints 80 sont écrasés et assurent l'étanchéité des chambres 20, 21, 22, 23. Les ailettes verticales 6000 définissent également la portée des joints 80.As mentioned above, the vertical corner angles 60 are intended to receive the vertical longitudinal members 10. The brackets 60 therefore have in practice a profile complementary to that of the longitudinal members 10. It may be advantageous to provide the sides of the corner pieces 60 of fins verticals 6000 ( Figures 5a, 5b and 5c ) configured to maintain the longitudinal members 10 within said brackets. By referring to figures 3 and 7 a seal 80, made of PTFE or graphite, is disposed between the side walls 20, 21, 22, 23 of the enclosure and the portion of the brackets 60 facing said walls. In this way, when the side walls 20, 21, 22, 23 are fixed to the longitudinal members 10, the joints 80 are crushed and ensure the sealing of the chambers 20, 21, 22, 23. The vertical fins 6000 also define the range joints 80.

Pour des plaques 40 de grandes dimensions, telles que celles représentées sur les figures 4 et 9d, les bords desdites plaques sont préférentiellement pourvus d'une ou plusieurs arêtes horizontales 42 supplémentaires. En pratique, seuls les bords ayant une longueur supérieure à une valeur déterminée par l'homme du métier, par exemple supérieure à 1 m, pourront être pourvus de ces arêtes 42 supplémentaires en leur milieu. Selon la longueur des bords de la plaque 40, il est possible de prévoir plusieurs arêtes horizontales supplémentaires 42. Par exemple pour des plaques ayant une longueur de 2 m, deux arêtes supplémentaires 42 pourront être prévues sur chaque bord. Ces arêtes horizontales 42 supplémentaires peuvent avoir la forme d'un U orienté vers l'intérieur de la plaque 40 (figure 9d) ou avoir une forme circulaire (demi-cercle) orientée vers l'intérieur de ladite plaque, ou toute autre forme convenant a l'homme du métier. Elles ont la même largeur et la même épaisseur que les arêtes d'angle 41. Les arêtes supplémentaires 42 sont facilement obtenues lors de l'emboutissage des plaques 40.For plates 40 of large dimensions, such as those shown on the figures 4 and 9d , the edges of said plates are preferably provided with one or more horizontal edges 42 additional. In practice, only the edges having a length greater than a value determined by those skilled in the art, for example greater than 1 m, may be provided with these additional edges 42 in their middle. Depending on the length of the edges of the plate 40, it is possible to provide a plurality of additional horizontal edges 42. For example for plates having a length of 2 m, two additional edges 42 may be provided on each edge. These additional horizontal edges 42 may have the shape of a U oriented towards the inside of the plate 40 ( figure 9d ) or have a circular shape (semicircle) oriented towards the inside of said plate, or any other form suitable to those skilled in the art. They have the same width and the same thickness as the corner edges 41. The additional edges 42 are easily obtained during the stamping of the plates 40.

En se rapportant à la figure 4, les arêtes supplémentaires 42 sont destinées à venir s'emboîter dans des lumières horizontales 900 réalisées sur des cornières verticales supplémentaires 90. Des longerons supplémentaires 91 sont ensuite insérés dans ces cornières supplémentaires 90. En se référant plus particulièrement à la figure 6, ces cornières supplémentaires 90 se présentent sous la forme de profilés métalliques monoblocs, ayant sensiblement la forme générale des arêtes supplémentaires 42, c'est-à-dire ayant une forme en U, circulaire ou autre. Comme pour les cornières 60, les lumières 900 sont parallèles entre elles, disposées les unes au-dessus des autres et ont la même épaisseur que celle des lumières 600. En pratique, les lumières 900 sont dimensionnées de manière à recevoir exactement les arêtes supplémentaires 42, un jeu étant préférentiellement prévu pour faciliter l'emboîtement. Lorsque les arêtes supplémentaires 42 sont positionnées dans les lumières 900, l'extrémité desdites arêtes est à l'arase de la surface interne des cornières supplémentaires 90. Les extrémités des arêtes 42 peuvent ainsi être facilement soudées dans les lumières 900. Des cordons de soudure 901 sont réalisés au droit des lumières 900 pour assurer la liaison mécanique entre les plaques 40 et les cornières supplémentaires 90. Il est également envisageable, mais non nécessaire, de réaliser un cordon de soudure vertical le long d'au moins un des bords externes de chaque cornière supplémentaire 90, au niveau des plaques 40.By referring to the figure 4 , the additional ridges 42 are intended to fit into horizontal slots 900 made on additional vertical angles 90. Additional longitudinal members 91 are then inserted into these additional angles 90. Referring more particularly to the figure 6 these additional angles 90 are in the form of one-piece metal profiles, having substantially the general shape of the additional edges 42, that is to say having a U-shaped, circular or other. As for the angles 60, the lights 900 are parallel to each other, arranged one above the other and have the same thickness as that of the lights 600. In practice, the lights 900 are sized to receive exactly the additional edges 42 , a game being preferably provided to facilitate nesting. When the additional edges 42 are positioned in the apertures 900, the end of said ridges is at the base of the inner surface of the additional angles 90. The ends of the ridges 42 can thus be easily welded into the slots 900. Welding beads 901 are made in line with 900 lights to ensure the mechanical connection between the plates 40 and additional angles 90. It is also possible, but not necessary, to produce a vertical weld bead along at least one of the outer edges of each additional angle 90, at the plates 40.

Comme mentionné précédemment, les cornières verticales supplémentaires 90 sont destinées à recevoir les longerons verticaux supplémentaires 91. Les cornières supplémentaires 90 ont donc en pratique un profil complémentaire de celui des longerons 91. Il peut être avantageux de munir les côtés des cornières 90 d'ailettes verticales 9000 (figure 6) configurées pour maintenir les longerons 91 à l'intérieur desdites cornières. En se rapportant à la figure 4, au niveau de chacun des bords munis des cornières 90, l'enceinte de l'échangeur pourra être fermée par deux parois latérales, respectivement 20a-20b, 21a-21b, 22a-22b et 23a-23b, chacune fixée sur un longeron d'angle 10 et sur un longeron vertical supplémentaire 91 au moyen de vis 200, de boulons ou de toute autre manière convenant à l'homme du métier. Si plusieurs cornières supplémentaires sont prévues sur un même bord de plaque, d'autres parois latérales pourront être fixées sur les longerons verticaux supplémentaires insérés dans lesdites cornières. Comme décrit précédemment, un joint 80, en PTFE ou graphite, est disposé entre les parois latérales de l'enceinte et la partie des cornières supplémentaires 90 en vis-à-vis desdites parois. Les ailettes verticales 9000 définissent également la portée des joints 80.As mentioned above, the additional vertical angles 90 are intended to receive the additional vertical spars 91. The additional angles 90 are therefore in practice a profile complementary to that of the longitudinal members 91. It may be advantageous to provide the sides of the angle 90 fins verticals 9000 ( figure 6 ) configured to maintain the longitudinal members 91 within said brackets. By referring to the figure 4 at the level of each of the edges provided with angles 90, the enclosure of the exchanger may be closed by two lateral walls, respectively 20a-20b, 21a-21b, 22a-22b and 23a-23b, each attached to a longitudinal spar. 10 and an additional vertical beam 91 by means of screws 200, bolts or any other manner suitable to the skilled person. If several additional angles are provided on the same plate edge, other side walls may be attached to the additional vertical members inserted into said brackets. As previously described, a seal 80, made of PTFE or graphite, is disposed between the side walls of the enclosure and the portion of the additional angles 90 vis-a-vis said walls. The vertical vanes 9000 also define the range of the joints 80.

En pratique, les parois latérales 20a, 20b, 21a, 21b, 22a, 22b, 23a, 23b sont des plaques métalliques ayant une épaisseur variant de 50 mm à 200 mm selon la pression des fluides. Sans les arêtes supplémentaires 42 et les cornières supplémentaires 90, il serait nécessaire de prévoir des parois latérales monoblocs reliant chaque cornière d'angle, lesdites parois devant avoir une plus grande épaisseur pour résister à la pression des fluides. La solution technique proposée par l'invention permet donc de réduire de manière significative l'épaisseur des parois latérales de l'échangeur.In practice, the side walls 20a, 20b, 21a, 21b, 22a, 22b, 23a, 23b are metal plates having a thickness ranging from 50 mm to 200 mm depending on the fluid pressure. Without additional ridges 42 and additional angles 90, it would be necessary to provide one-piece side walls connecting each corner angle, said walls having to have a greater thickness to withstand the pressure of the fluids. The technical solution proposed by the invention therefore significantly reduces the thickness of the side walls of the exchanger.

Les arêtes supplémentaires 42 et les cornières supplémentaires 90 pourront également être prévues sur des échangeurs de taille réduite ou standard, par exemple des échangeurs composés de plaques 40 ayant une longueur d'environ 30 cm, mais soumises à des pressions importantes (de l'ordre de 35 bar à 40 bar). Cette conception contribuera à la rigidité de l'ensemble en évitant que les plaques se désolidarisent localement les unes des autres sous l'effet de la pression.Additional ridges 42 and additional angles 90 may also be provided on reduced or standard exchangers, for example exchangers composed of plates 40 having a length of about 30 cm, but subjected to significant pressures (of the order from 35 bar to 40 bar). This design will contribute to the rigidity of the assembly by avoiding that the plates are disconnected locally from each other under the effect of pressure.

Claims (15)

  1. Heat exchanger comprising a closed chamber inside which are arranged ribbed welded plates (40) defining between them interpenetrating independent circuits in which fluids are intended to flow, the side walls (20, 21, 22, 23) delimiting said chamber being fixed to vertical rails (10) inserted into vertical angle irons (60), being characterized by the fact that said plates include, in each corner, an edge (41) that fits into slots (600) formed on the vertical angle irons (60).
  2. Exchanger according to Claim 1, in which the edges (41) and the slots (600) of the angle irons (60) are horizontal.
  3. Exchanger according to Claim 2, in which the angle irons (60) have a central square, bevel or circular shaped portion, the slots (600) being produced in the central angular, beveled or circular portion of said angle irons, said slots being parallel to one another and arranged one above the other.
  4. Exchanger according to Claim 3, in which the slots (600) are staggered.
  5. Exchanger according to one of the preceding claims, in which the edges (40) are welded into the slots (600) of the angle irons (60).
  6. Exchanger according to one of the preceding claims, in which a vertical weld bead (71) is formed along at least one of the outer lips of each angle iron (60), at the level of the plates (40), so as to ensure a seal-tightness between the fluid circuits.
  7. Exchanger according to one of Claims 3 to 5, in which a vertical weld bead ensuring the seal-tightness between the fluid circuits is formed inside the angle irons (60), along their central angular, beveled or circular portion, said angle irons including a longitudinal slot (601) in their central angular, beveled or circular portion, said weld bead being formed in this longitudinal slot, outside said fluid circuits.
  8. Exchanger according to one of the preceding claims, in which the lips of the plates (40) are provided with one or more additional edges (42) that fit into the slots (900) formed on additional vertical angle irons (90), additional vertical rails (91) to which are fixed side walls (20a, 20b, 21a, 21b, 22a, 22b, 23a, 23b) delimiting the chamber being inserted into said angle irons.
  9. Exchanger according to Claim 8, in which the additional edges (42) located on the lips of the plates (40) and the slots (900) of the additional angle irons (90), are horizontal.
  10. Exchanger according to one of the preceding claims, in which the chamber is provided with a top cover (30) and a bottom (31) cooperating in a seal-tight manner with the side walls (20, 21, 22, 23), said cover being equipped with orifices (300) for bleeding air and said bottom being equipped with orifices (310) for bleeding the fluids intended to flow in the independent circuits.
  11. Ribbed plate intended to be used in the exchanger according to Claim 1, said plate including in each corner a horizontal edge (41) in the form of a bracket oriented toward the interior of said plate.
  12. Ribbed plate intended to be used in the exchanger according to Claim 1, said plate including in each corner a horizontal edge (41) having a circular shape oriented toward the interior of said plate.
  13. Ribbed plate intended to be used in the exchanger according to Claim 1, said plate including in each corner a horizontal edge (41) having a beveled shape oriented toward the interior of said plate.
  14. Ribbed plate according to one of Claims 11 to 13, in which the lips of said plate are provided with one or more horizontal edges (42) in the form of a U oriented toward the interior of said plate.
  15. Ribbed plate according to one of Claims 11 to 13, in which the lips of said plate are provided with one or more horizontal edges (42) having a circular shape oriented toward the interior of said plate.
EP09802172.8A 2008-12-15 2009-12-15 Heat exchanger with welded plates Active EP2376860B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0858570A FR2939879B1 (en) 2008-12-15 2008-12-15 THERMAL EXCHANGER WITH WELDED PLATES
PCT/FR2009/052531 WO2010076477A1 (en) 2008-12-15 2009-12-15 Heat exchanger with welded plates

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EP2376860A1 EP2376860A1 (en) 2011-10-19
EP2376860B1 true EP2376860B1 (en) 2016-04-20

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EP (1) EP2376860B1 (en)
CN (1) CN102282437B (en)
CA (1) CA2746977A1 (en)
ES (1) ES2583633T3 (en)
FR (1) FR2939879B1 (en)
HU (1) HUE029704T2 (en)
PL (1) PL2376860T3 (en)
PT (1) PT2376860T (en)
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CN102282437A (en) 2011-12-14
PT2376860T (en) 2016-07-27
PL2376860T3 (en) 2016-12-30
US9134073B2 (en) 2015-09-15
ES2583633T3 (en) 2016-09-21
EP2376860A1 (en) 2011-10-19
FR2939879A1 (en) 2010-06-18
US20120000633A1 (en) 2012-01-05
WO2010076477A1 (en) 2010-07-08
CA2746977A1 (en) 2010-07-08
FR2939879B1 (en) 2011-03-04
ZA201104815B (en) 2012-09-26
CN102282437B (en) 2016-04-20
HUE029704T2 (en) 2017-03-28

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