Classifications

• • 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
  • F28F9/02—Header boxes; End plates
  • F28F9/04—Arrangements for sealing elements into header boxes or end plates
  • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
  • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
• • 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
  • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2225/00—Reinforcing means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
  • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
• • 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
  • F28F2275/06—Fastening; Joining by welding

Definitions

• the present invention relates to a heat exchanger with welded exchange plates, for carrying out a heat exchange between a first fluid and a second fluid.
• a heat exchanger with welded exchange plates, compact structure designated by the trade name "HEATEX” (registered trademark), comprising metal plates previously stamped, assembled two by two by welding on two opposite sides, and thus forming stacked modular elements defining two independent circuits respectively for a first fluid and a second fluid.
• the set of plates, thus joined, forms an exchange block of rectangular horizontal section, so generally parallelepiped, which is assembled to four posts or corner posts belonging to the frame of the heat exchanger.
• the open ends of the stacked modular elements are docked to the edge of lights in the opposite vertical connecting walls of the exchange block.
• the heat exchanger is closed by four lateral doors screwed on the frame uprights, and easily removable for maintenance.
• the European Patent No. EP 0639258 B1 offers a solution that eliminates the differential expansion stresses between the exchange block consisting of all the stacked plates, on the one hand, and the frame on the other hand, this thanks to "corner gutters" which are integral with the aforementioned connecting walls, and which partially surround the amounts of the frame, with the possibility of relative sliding.
• the heat exchanger according to the European Patent No. EP 0639258 B1 has advantageous characteristics, in terms of temperature behavior, compared to prior art constructions also known welded plate heat exchangers, such as those described in the European patent applications EP 0165179 A and EP 0186592 A.
• the exchange plates tend to expand along their length, in a direction perpendicular to the connecting walls at their ends.
• the corresponding expansion stress is calculated by the F / S ratio, where F is the expansion force and S is the section of the weld supporting this stress.
• the present invention therefore aims to provide improvements to the heat exchanger with welded plates, as described in European Patent No. 0 EP 0639258 B1, in order to improve its temperature behavior, and in particular to avoid the risk of rupture under the effect of expansion stresses.
• the subject of the invention is essentially a heat exchanger with welded exchange plates, of the kind previously considered, that is to say comprising metal plates that have been previously stamped, assembled two by two by welding on two sides. opposed to form stacked modular elements defining two independent circuits respectively for a first fluid and a second fluid, the ends of the plates being welded by docking on the edge of lights arranged in opposite connecting walls, perpendicular to said plates, to form a exchange block generally parallelepipedic, which is assembled to four posts or corner uprights belonging to the frame of the heat exchanger, this exchanger being characterized in that, on their sides to assemble, the two stamped metal plates constituting each modular element are on each side applied flat one cont re the other on a predefined width, are joined to one another by a first weld made in this width and ensuring the mechanical strength of the assembly, and are also joined to each other along their outer edges, by a second weld ensuring sealing.
• the invention replaces the usual "edge-to-edge” assembly of the two stamped plates by a particular configuration, consisting of “jogging" of one or both plates, so that the two plates are juxtaposed on a predefined width, preferably at least equal to fifteen millimeters, allowing the realization of a double weld.
• each post or corner post of the welded plate heat exchanger frame has a chamfered inner edge, the adjacent connecting wall connecting to the post or corner post in the region of this chamfered ridge.
• the exchange plates tend to expand, they can carry with them the connecting walls which then comprise a possibility of additional deformation, bending in the space released by the chamfered edges of posts or corner posts.
• the expansion stress is absorbed largely by the bending, now made possible, of the connecting wall.
• each connecting wall comprises, in its two lateral zones, bellows conformations for its connection to the post or corner post, in the region of the chamfered edge.
• the bellows conformations which may each consist simply of two inverted folds together forming a kind of sinusoidal wave, facilitate, if necessary, an expansion along an axis perpendicular to the direction of the longitudinal expansion of the exchange plates.
• the chamfered edges of the columns or uprights provide a free space used here not only for the bending of the connecting walls, but also for the housing and the deformation of the bellows conformations.
• FIG. 1 is a partial and very schematic view in exploded perspective, showing the general principle of assembly of a heat exchanger of the type concerned by the present invention
• Figure 2 is a cross-sectional view illustrating the current mode of assembly of the plates of such an exchanger on one of their sides;
• Figure 3 is a sectional view similar to Figure 2, but illustrating the method of assembly according to the present invention;
• Figure 4 is a sectional view through one of the corner areas of such an exchanger, and illustrating the current connection mode between a connecting wall and a post or corner post;
• Figure 5 is a sectional view similar to Figure 4, but illustrating the connection mode according to the present invention;
• Figure 6 is a horizontal sectional view of a heat exchanger according to the present invention.
• Figure 7 is a perspective view showing a detail of the lower part of the exchanger of Figure 6.
• a heat exchanger with welded exchange plates comprises a series of modular elements 2, of square or rectangular general shape, which are stacked and all assembled between two opposing connecting walls 3, of shape rectangular, perpendicular to the modular elements 2.
• These modular elements 2 have a very elongated section, and their ends are welded, by docking, on the edges of parallel lights 4 arranged in the connecting walls 3.
• connecting walls 3 are themselves assembled, along their longitudinal edges (here vertical), posts or corner posts 5, four in number.
• the lower and upper ends of the columns or corner posts 5 are assembled, respectively, to a lower base and an upper base, not shown in Figure 1, to form a complete frame, generally parallelepiped shape.
• all the modular elements 2 form a exchange block, itself of parallelepipedal general shape, which defines two independent fluid circuits, namely a first fluid circuit constituted by the modular elements 2, and a second fluid circuit resulting from the free spaces located between these modular elements 2.
• Inlet and outlet pipes for the two fluid circuits thus formed are also provided.
• each modular element 2 results from the assembly on two opposite sides of two metal plates 6 and 7 previously stamped for at least one of them.
• Figure 2 illustrates the current mode of assembly of the two plates 6 and 7, on one side (the other side being made symmetrically).
• the two plates 6 and 7 are each folded at 45 °, one in the direction of the other, and a single longitudinal weld 8, type "TIG", joins these two plates 6 and 7 along their edges, brought against each other.
• the welded connection of the end thereof to the connecting wall is, in the example shown (for plates with a thickness of 1.5 mm ), on a section of 2 x 2.8 mm x 1.5 mm, or 8.4 mm 2 , and this welded assembly has a peak stress concentration at the longitudinal weld 8.
• Figure 3 illustrates the solution proposed here by the present invention.
• One of the plates 6 remains here flat in the region of the side of the modular element 2, while the other plate 7 is made with a "soyage" that is to say it has a first fold 9 , for example at 45 °, followed by a second fold 10 for example at 45 ° but in the opposite direction of the preceding one, leading to the formation of a lateral strip 11 of width L, parallel to the main plane of the plate 7 considered .
• the plate 7 is applied flat against the lateral region of the plate 6.
• the two plates 6 and 7 are then joined to one another, in the width L, by a first welding 12 which may be a spot weld or a laser weld or a weld at the wheel, ensuring the mechanical strength of the assembly.
• the two plates 6 and 7 are also joined to each other, along their outer edges, by a second weld 13 which is in particular a type of "TIG" welding, by which ensures simply sealing.
• the two plates 6 and 7 are thus juxtaposed in the lateral region of the modular element 2, over a width L equal to at least fifteen millimeters.
• the embodiment according to the invention provides at the assembly of the end of the modular element 2 to the connecting wall, a welding section equal to:
• FIG. 4 shows, in horizontal section, one of the corner zones of a heat exchanger, showing a modular element portion 2 assembled to a connecting wall 3, and a post or corner post 5 belonging to the frame of the exchanger. More particularly, this Figure 4 illustrates the current mode of connection between the connecting wall 3 and the post or corner post 5, the latter having a usual square section. In this case, the connection has a rigidity at the two points P1 and P2, rigidity which opposes the free longitudinal expansion of the exchange plates, according to the arrow F.
• Figure 5 illustrates the solution here proposed by the present invention. This consists in chamfering the inner edge of the post or corner post 5. More particularly, a 45 ° cut is made of the two adjacent faces 14 and 15 of the post or post 5, with a width of at least ten millimeters, so as to form a chamfer 16 which itself gives off a free space 17 of triangular section.
• the modular element 2 tends to expand, according to the arrow F, it can carry with it the adjacent connecting wall 3, which can flex into the free space 17, the first point of rigidity P1 being removed . The expansion stress is thus absorbed largely by the bending of the connecting wall 3.
• the connecting wall 3 is connected to the post or corner post 5 in each zone.
• each connecting wall 3 has, at its base, a portion 21 devoid of lights 4 and folded horizontally above the lower base 20, on which it is fixed. On the portion 21 is formed a longitudinal fold 22 which absorbs the expansion at this location.
• similar arrangements are provided in the upper part of the heat exchanger.
• the heat exchanger can be made indifferently with stamped plates provided with a network of bosses, or cuvettes, or with stamped plates having parallel ribs or grooves, or with smooth plates provided with studs reported, according to all configurations known per se.
• These exchange plates may consist of simple sheets, for example stainless steel.
• it may also be so-called “sandwich” sheets, made on one side by a stainless steel support layer, of sufficient thickness to ensure the term pressure, and on the other side by a metal layer or noble alloy, thin, especially based on nickel, tantalum or zirconium.
• the provisions of the present invention are particularly suitable for assembling such "sandwich” sheets together.
• Heat exchangers with welded exchange plates made according to the invention can find industrial applications in various fields: chemical and pharmaceutical industry, food industry, heating installations, etc.
• the exchange plates in all shapes and sizes, in particular with square or rectangular general shapes, and in all weldable materials;
• the welds of these plates by making the welds of these plates by implementing any appropriate method, whether it be the first weld or the second weld, for example by performing the second weld by a "plasma" method; by modifying the connection of the connecting walls with the uprights or posts of the frame, the connecting walls not being necessarily welded to the frame, but which can also be welded to intermediate parts, themselves applied around a pole, which pass in particular on the chamfered edge and the faces adjacent to the chamfer and which can overflow on the following faces;

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2006
  • 2006-05-12 FR FR0604244A patent/FR2901016B1/fr not_active Expired - Fee Related
• 2007
  • 2007-05-10 AT AT07731433T patent/ATE443839T1/de active
  • 2007-05-10 DK DK07731433.4T patent/DK2021720T3/da active
  • 2007-05-10 CN CN2007800170250A patent/CN101443619B/zh not_active Expired - Fee Related
  • 2007-05-10 DE DE602007002565T patent/DE602007002565D1/de active Active
  • 2007-05-10 JP JP2009510491A patent/JP5313131B2/ja not_active Expired - Fee Related
  • 2007-05-10 US US12/298,938 patent/US20100132929A1/en not_active Abandoned
  • 2007-05-10 PT PT07731433T patent/PT2021720E/pt unknown
  • 2007-05-10 ES ES07731433T patent/ES2334285T3/es active Active
  • 2007-05-10 PL PL07731433T patent/PL2021720T3/pl unknown
  • 2007-05-10 EP EP07731433A patent/EP2021720B1/de active Active
  • 2007-05-10 WO PCT/FR2007/000792 patent/WO2007132083A1/fr active Application Filing
  • 2007-05-10 BR BRPI0712792-8A patent/BRPI0712792A2/pt not_active IP Right Cessation
• 2008
  • 2008-12-12 KR KR1020087030318A patent/KR101344827B1/ko not_active IP Right Cessation

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