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
  • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
  • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
  • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
  • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations

Definitions

• the present invention relates to a welded plate heat exchanger, for performing a heat exchange between a first fluid and a second fluid flowing between the plates of the exchanger.
• This invention also relates to the plates constituting such a heat exchanger.
• the invention relates to a heat exchanger which comprises previously stamped metal plates, assembled two by two by welding on two opposite sides and thus forming stacked modular elements, the set of plates together forming an exchange block of parallelepipedic general shape.
• corrugated plate heat exchangers also called “corrugated” plates
• plate-type heat exchangers linked by struts also called “studded” plates
• padded plate heat exchangers these can be considered as a variant of the plate-type exchangers connected by spacers.
• each plate of a modular element has parallel ribs, giving this plate a corrugated profile.
• the ribs of a plate of the modular element have a direction different from that of the ribs of the other plate of the same modular element.
• the plates In plate-type heat exchangers connected by spacers, the plates have spacers arranged on their extent, in a square or triangular-based pattern. Thus, during the stacking of such plates, one obtains fluid circuits whose thickness corresponds to the distance between consecutive plates, itself determined by the height of said spacers.
• the padded plate heat exchangers comprise, on the extent of their plates, bosses arranged in a regular pattern. When assembling two plates arranged in opposite directions, the bosses of one plate come into contact with the bosses of the other plate, to form spacers connecting these two plates and fixing their spacing, the corresponding bosses of the two plates being welded together.
• European patent EP 0639258 B1 discloses such an embodiment of padded plate heat exchanger, with frustoconical cup-shaped bosses, flat bottom, obtained by stamping.
• the padded plates have the advantage of creating, for one of the fluids, a pressure-resistant circuit.
• the embossed bosses generate in the flow of fluid between the two plates turbulence quite correct, and thus provide performance close to that of the ribbed plates.
• the circuit for the second fluid delimited between the modular elements formed by two plates joined by their bosses, provides a perfectly free passage and can therefore be very advantageously used for highly charged fluids.
• this circuit has the disadvantage of having a thermal performance close to that of a flat tube, so relatively average.
• the quilted plate heat exchangers thus have superior performance to traditional tubular heat exchangers, but significantly lower than the ribbed plate heat exchangers.
• the present invention aims to provide a welded plate heat exchanger which combines the advantages of the various categories of exchangers mentioned above, while avoiding their disadvantages, and thus the object of the invention is to create a heat exchanger which has a high efficiency. thermal, while maintaining the ability to easily clean its internal channels, this heat exchanger to be otherwise resistant to pressure and be conveniently and conveniently manufactured and assembled.
• the invention also aims to provide a plate for the formation of such an exchanger.
• the subject of the invention is a welded plate heat exchanger, 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 one first fluid and for a second fluid, adjacent plates further having contact points distributed over the extent of these plates, the heat exchanger being essentially characterized by the fact that the plates comprise, on their extent, a part of the parallel ribs giving them a corrugated profile, and secondly bosses whose vertices lie in a plane containing the bases or the vertices of the ribs, two adjacent plates having ribs of different directions so that these two plates are in contact at the same time by the points of intersection of the vertices of their respective ribs and p ar the vertices of their respective respective bosses, the vertices of the bosses of a plate being welded to the corresponding bosses tops of the other plate.
• the bosses of each plate of the exchanger have vertices of flat shape, located in the plane containing the bases or the vertices of the ribs of this plate.
• bosses are distributed over the extent of each plate of the exchanger, in a predefined pattern and with a more or less dense distribution. These bosses can, in particular, be aligned with certain ribs of each plate of the exchanger, and present themselves in this case as local interruptions, regularly spaced, of these ribs. For example, bosses are thus formed on one rib on two of each plate of the exchanger. Viewed in the direction of the ribs, the bosses may have a staggered arrangement, the bosses formed on a rib being offset, in this direction, relative to the bosses formed on the next rib encountered with bosses.
• the two plates of a modular element must also be welded together on two opposite sides.
• the plates have, for this purpose, respective edges welded to each other, edges which are either located in the plane of the tops of the bosses, or bent at right angles to this plane.
• a heat exchanger thus made combines the particularities and advantages of the ribbed plate heat exchangers and padded plate heat exchangers.
• the exchanger according to the invention creates high turbulence as a traditional ribbed plate heat exchanger, while having excellent resistance to pressure due to the welded connection made between the plates, over the extent thereof .
• at least one fluid circuit of the exchanger is made very resistant to pressure, and therefore the effects of inflating the channels and the risk of fatigue breakage are avoided; this eliminates the limits to which traditional plate heat exchangers are subjected.
• the ribbed and bossed plates provide an excellent compromise between the simply ribbed plates on the one hand, and the quilted plates on the other hand, by combining the pressure resistance to one of the fluid circuits, the free access for cleaning the other fluid circuit and a very high thermal efficiency.
• each boss located on a rib has a flat portion of square or rectangular shape, located at the base of the rib, and two opposing facets, generally triangular, located in inclined planes and joining the top of the rib.
• the invention also relates to a metal plate specially designed for the constitution of a welded plate heat exchanger, as defined above, this plate having, on its extent, on the one hand parallel ribs conferring a corrugated profile, and secondly bosses whose apex is in a plane containing the bases or the vertices of the ribs, the vertices of the bosses of the plate being provided to be welded to the tops of the bosses of another similar plate .
• the bosses of the plate have vertices of flat shape, located in the plane containing the bases or the vertices of the ribs of this plate, which facilitates their welding on the bosses of another plate.
• the bosses of the plate are aligned with certain ribs of this plate, said bosses being local interruptions, regularly spaced, of these ribs.
• the bosses can thus be formed on one rib on two of the plate, which then has an alternation of continuous ribs and ribs interrupted by bosses.
• the bosses thereof may have a staggered arrangement, the bosses formed on a rib being offset, in this direction, relative to the bosses formed on the next rib encountered provided with bosses.
• Figure 1 is a perspective view showing two heat exchanger plates according to the invention matched, before assembly;
• Figure 2 is a perspective view of the modular element, resulting from the assembly of the two plates of Figure 1;
• Figure 3 is a perspective view showing two consecutive modular elements, in a first heat exchanger configuration
• Figure 4 is a perspective view showing consecutive modular elements, in another heat exchanger configuration
• Figure 5 is a perspective view showing, as a whole, a heat exchanger according to the present invention.
• FIG. 1 shows two metal plates 1 and 2, of generally square shape, intended to be assembled together to form an element.
• modular 3 itself shown in Figure 2, which is intended to be stacked with similar elements to form a parallelepiped exchange block.
• the plate 1 here described primarily, has on its extent ribs 4 and 5 parallel to each other and a diagonal direction of the plate 1, so that it has a general wave profile.
• a rib 4 out of two is a continuous rib from one end to the other.
• the continuous ribs 4 alternate with ribs 5 which are interrupted locally, at regular intervals, by bosses 6 whose vertices 7 are situated in a plane containing the bases of the ribs 4 and 5.
• the set of bosses 6 has a provision in FIG. staggered, that is to say that the bosses 6 of a rib 5 are offset (in the longitudinal direction of the ribs) relative to the bosses 7 of the nearest ribs 5, the offset being equal to a "half-step ".
• each boss 6 has a flat vertex 7, of square or rectangular shape, and two opposite facets 8 and 9, of triangular shape and located in inclined planes, the inclination of one of the facets 8 being opposite the inclination of the other facet 9.
• the base of each facet 8 or 9 triangular is in the plane of the vertex 7 of the boss 6, while the tip of this facet is at the top of the corresponding rib 5.
• the other plate 2 has a configuration similar to that of the plate 1.
• the two plates 1 and 2 each have two flat and parallel first edges 10 and 1 1, situated in the plane of the vertices 7 of their respective bosses 6.
• Each of the two plates 1 and 2 also has two other edges 12 and 13, parallel to each other but perpendicular to the preceding edges 10 and 11, these other edges 12 and 13 having an offset zone, that is to say located at the from the base of the bosses 6.
• the two plates 1 and 2 are arranged so that:
• the two plates 1 and 2 being close to one another, they are welded together along their edges 10 and 1 1, and at the vertices 7 of their respective bosses 6 which are brought into contact.
• the modular element 3 is then obtained in which the two plates 1 and 2 also come into contact at the crossing points of their ribs 4 and 5 - see FIG. 2.
• the offset zones of these edges lead to the formation of elongate louvers 14, allowing on one side the inlet of a fluid and on the other side the exit of this fluid.
• FIGS 3 to 5 illustrate stacking modes of modular elements 3 thus formed for the formation of an exchange block.
• the modular elements 3 are spaced from each other. These modular elements 3, traversed by a first fluid, are thus separated from each other by completely free spaces 15, in which circulates a second fluid. The spacing and the maintenance of the modular elements 3 is ensured by the engagement of their angles, at the junction of the edges 10 to 13, in "combs" 16 provided with parallel slots 17 spaced appropriately.
• the modular elements 3 here advantageously comprise side panels 18 bent at right angles, which laterally close (on two opposite sides) the free spaces 15.
• the exchange block thus formed, is itself placed inside a framework or a frame, comprising two parallel square plates 19 and 20 connected by four corner posts 21, as shown in FIG. 5, the side faces of this frame being closed by unrepresented panels or doors.
• the edges of the plates 1 and 2 may comprise, on two opposite sides, respective edges folded at right angles and welded to each other, to constitute each modular element 3.

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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)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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Citations (6)

• 2010
  • 2010-11-05 FR FR1059128A patent/FR2967247B1/fr not_active Expired - Fee Related
• 2011
  • 2011-10-31 ES ES11802458T patent/ES2901707T3/es active Active
  • 2011-10-31 EP EP11802458.7A patent/EP2635867B1/fr active Active
  • 2011-10-31 PT PT118024587T patent/PT2635867T/pt unknown
  • 2011-10-31 WO PCT/FR2011/052552 patent/WO2012059683A1/fr active Application Filing

Patent Citations (6)

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