EP2886995B1 - Plattenwärmetauscher mit Befestigungsflansch - Google Patents

Plattenwärmetauscher mit Befestigungsflansch Download PDF

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Publication number
EP2886995B1
EP2886995B1 EP13198881.8A EP13198881A EP2886995B1 EP 2886995 B1 EP2886995 B1 EP 2886995B1 EP 13198881 A EP13198881 A EP 13198881A EP 2886995 B1 EP2886995 B1 EP 2886995B1
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EP
European Patent Office
Prior art keywords
plate
heat exchanger
end surface
mounting
plate heat
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
EP13198881.8A
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English (en)
French (fr)
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EP2886995A1 (de
Inventor
Håkan Larsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfa Laval Corporate AB
Original Assignee
Alfa Laval Corporate AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alfa Laval Corporate AB filed Critical Alfa Laval Corporate AB
Priority to EP13198881.8A priority Critical patent/EP2886995B1/de
Priority to SE1650781A priority patent/SE1650781A1/sv
Priority to PCT/EP2014/077422 priority patent/WO2015091214A1/en
Priority to TW103144275A priority patent/TWI539134B/zh
Publication of EP2886995A1 publication Critical patent/EP2886995A1/de
Application granted granted Critical
Publication of EP2886995B1 publication Critical patent/EP2886995B1/de
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Anticipated expiration legal-status Critical

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    • 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
    • F28D9/0043—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 plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—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 plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
    • 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
    • F28F9/002—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core with fastening means for other structures
    • 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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/0075—Supports for plates or plate assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts
    • F28F2280/06—Adapter frames, e.g. for mounting heat exchanger cores on other structure and for allowing fluidic connections

Definitions

  • the present invention relates to a plate heat exchanger that comprises a plurality of heat exchanger plates which are stacked and permanently connected to form a plate package and a mounting structure which is permanently connected to the plate package for releasable attachment of the plate heat exchanger to an external supporting structure.
  • Heat exchangers are utilized in various technical applications for transferring heat from one fluid to another fluid.
  • Heat exchangers in plate configuration are well-known in the art.
  • a plurality of stacked plates having overlapping peripheral side walls are put together and permanently connected to define a plate package with hollow fluid passages between the plates, usually with different fluids in heat exchange relationship in alternating spaces between the plates.
  • a coherent base plate or mounting plate is directly or indirectly attached to the outermost one of the stacked plates.
  • the mounting plate has an extension that exceeds the stack of plates so as to define a circumferential mounting flange.
  • the mounting flange has holes or fasteners to attach the heat exchanger to a piece of equipment.
  • This type of plate heat exchanger is e.g. known from US2010/0258095 and US8181695 .
  • the mounting plate When fastened on the piece of equipment, the mounting plate may be subjected to a significant pressure and weight load which tends to deform the mounting plate. To achieve an adequate strength and rigidity, the mounting plate needs to be comparatively thick. Such a thick mounting plate may add significantly to the weight of the heat exchanger. Furthermore, the use of a thick mounting plate leads to a larger consumption of material and a higher cost for the heat exchanger.
  • the need for a thick mounting plate may be particularly pronounced when the heat exchanger is mounted in an environment which is subjected to vibrations. Such vibrations may e.g. occur when the plate heat exchanger is mounted in a vehicle such as a car, truck, bus, ship or airplane.
  • the design of the plate heat exchanger in general, and the design and attachment of the mounting plate in particular need to take into account the risk for fatigue failure caused by cyclic loading and unloading of the mounting plate by the vibrations.
  • the cyclic stresses in the heat exchanger may cause it to fail due to fatigue, especially in the joints between the plates, even if the nominal stress values are well below the tensile stress limit.
  • the risk for fatigue failure is typically handled by further increasing the thickness of the mounting plate, which will make it even more difficult to keep down the weight and cost of the plate heat exchanger.
  • the prior art comprises DE102007008459 , which proposes a unitary tray-shaped mounting plate for a plate heat exchanger.
  • the mounting plate has a planar bottom surface and an edge surface which is inclined upwards from the bottom surface to define a tray for receiving the stack of plates.
  • Tongues for fastening the heat exchanger are integrated with the edge surface and arranged to extend parallel to the bottom surface.
  • a depression is formed at the center of the respective tongue to enhance its strength.
  • WO2011/009412 discloses a plate heat exchanger with two spaced apart mounting plates attached to the end of the stack of plates.
  • the shape of the mounting plates generally conforms to the contour of the stack of plates.
  • the heat exchanger is fastened by connecting members that extend out of the respective mounting plate and are received in cavities defined between the respective mounting plate and the end of the stack of plates.
  • Another objective is to provide a plate heat exchanger with a relatively low weight and a relatively high strength when mounted to an external supporting structure.
  • a further objective is to provide a plate heat exchanger that can be manufactured at low cost.
  • Yet another objective is to provide a plate heat exchanger suitable for use in environments subjected to vibrations.
  • a first aspect of the invention is a plate heat exchanger, comprising: a plurality of heat exchanger plates which are stacked and permanently connected to form a plate package that defines first and second fluid paths for a first medium and a second medium, respectively, separated by said heat exchanger plates, said plate package defining a surrounding external wall that extends in an axial direction between first and second axial ends; an end plate permanently connected to one of the first and second axial ends so as to provide an end surface that extends between first and second longitudinal ends in a lateral plane which is orthogonal to the axial direction; and two mounting plates permanently connected to a respective surface portion of the end surface at the first longitudinal end and the second longitudinal end, respectively, such that the mounting plates are spaced from each other in a longitudinal direction on the end surface, wherein each of the mounting plates comprises opposing flat engagement surfaces connected by an edge portion that extends along the perimeter of the mounting plate.
  • Each of the mounting plates is arranged with one of its engagement surfaces permanently connected to the end surface, such that the perimeter of the mounting plate partially extends beyond the outer periphery of the end surface, so as to define a mounting flange, and partially extends across the end surface in contact with the same.
  • At least one slot is formed in the edge portion of each of the mounting plates and is arranged to extend below the end surface so as to intersect the perimeter of the surrounding external wall as seen in a normal direction to the end surface.
  • the inventive plate heat exchanger is based on the insight that the coherent mounting plate of the prior art may be replaced by two smaller mounting plates that are located at a respective longitudinal end on the end surface on the plate package to provide a respective mounting flange for the heat exchanger.
  • the use of two smaller, separated mounting plates may reduce the weight of the heat exchanger, and also its manufacturing cost, since material is eliminated in the space between the mounting plates, beneath the end surface of the plate package.
  • the inventive heat exchanger is furthermore based on the insight that the use of two separated mounting plates may lead to local stress concentration in the heat exchanger, which may act to reduce the heat exchanger's ability to sustain loads, and in particular cyclic loads.
  • the concentration of stress has been found to originate in the region where the edge portion of the mounting plate intersects the surrounding wall of the plate package.
  • one or more slots are provided in the edge portion and located to intersect the perimeter of the surrounding wall, as seen in the normal direction of the end surface.
  • the slot or slots provide a locally increased flexibility in the material of the mounting plate without significantly reducing the strength and stiffness of the mounting plate as a whole.
  • the locally increased flexibility serves to distribute the load that is transferred to the mounting plates, the end plate and the plate package via the mounting flanges.
  • the inventive heat exchanger may therefore be designed to achieve a more uniform distribution of stress in the plates of the heat exchanger and in the joints between these plates.
  • the distribution of stress may be controlled further by optimizing the design parameters of the heat exchanger in general, and the mounting plates in particular, for example according to the following embodiments.
  • the edge portion comprises an edge surface that extends between the engagement surfaces, the at least one slot being formed in the edge surface.
  • the edge surface may be essentially flat, and preferably perpendicular to the engagement surfaces.
  • the at least one slot extends essentially parallel to the end surface.
  • the at least one slot is located in proximity of and spaced from the engagement surface that faces the end surface.
  • the at least one slot may be spaced from the engagement surface that faces the end surface by a material thickness of less than about 3 mm, preferably less than about 1 mm or about 2 mm.
  • the at least one slot is configured to form a blind-hole that defines an elongated opening in the edge portion, said blind-hole having a bottom wall and first and second side walls, the first and second side walls being spaced from each other in the axial direction and extending from the bottom wall to the elongated opening in the edge portion.
  • the bottom wall may comprise a curved portion, which may be defined by a radius.
  • the first side wall which is located closer to the end surface than the second side wall, may connect to the edge portion at the elongated opening so as to define an angle ⁇ to the lateral plane, wherein 0 ° ⁇ ⁇ 45°, and preferably 0° ⁇ ⁇ 45°, as seen in a cross-section perpendicular to the lateral plane.
  • the first side wall may define a straight line from the elongated opening to the bottom wall, as seen in the cross-section perpendicular to the lateral plane.
  • the bottom wall may define an arc of a circle as seen in a cross-section parallel to the lateral plane.
  • the at least one slot comprises a coherent slot that at least spans the end surface in the transverse direction so as to intersect the perimeter of the surrounding external wall at two opposing sides of the plate package, as seen in the normal direction to the end surface.
  • the end plate is a sealing plate which is permanently and sealingly connected to one of the heat exchanger plates at one of said first and second axial ends.
  • the end plate is a reinforcement plate which is permanently connected to a sealing plate on the plate package, wherein the end plate has at least two supporting flanges that extend beyond the perimeter of the surrounding external wall so as to abut on the mounting flange defined by the respective mounting plate.
  • the end plate may comprise, along its perimeter and as seen in the normal direction of the end surface, concave or beveled surfaces adjacent to the supporting flanges, wherein the concave or beveled surfaces may be located to overlap the perimeter of the respective mounting plate at intersection points where the perimeter of the respective mounting plate intersects the perimeter of the surrounding external wall, and the respective concave or beveled surface may be non-perpendicular to the perimeter of the mounting plate at the overlap, as seen in the normal direction to the end surface.
  • At least one of the mounting plates defines at least one through hole that extends between the engagement surfaces and is aligned with a corresponding through hole defined in the end plate and an internal channel defined in the plate package, so as to form an inlet or an outlet for the first or the second medium.
  • the mounting flange comprises a plurality of mounting holes adapted to receive bolts or pins for fastening the plate heat exchanger.
  • the heat exchanger plates are permanently joined to each other through melting of metallic material.
  • Embodiments of the present invention relate to configurations of a mounting structure on a plate heat exchanger. Corresponding elements are designated by the same reference numerals.
  • Figs 1-3 disclose an embodiment of a plate heat exchanger 1 according to the invention.
  • the plate heat exchanger 1 comprises a plurality of plates which are stacked one on top of the other to form a plate package 2.
  • the plate package 2 may be of any conventional design.
  • the plate package 2 comprises a plurality of heat exchanger plates 3 with corrugated heat transfer portions that define flow passages (internal channels) for a first and second fluid between the heat exchanger plates 3 such that heat is transferred through the heat transfer portions from one fluid to the other.
  • the heat exchanger plates 3 may be single-walled or double-walled.
  • the heat exchanger plates 3 are only schematically indicated in Fig. 1 , since they are well-known to the person skilled in the art and their configuration is not essential for the present invention.
  • the plate package 2 has the general shape of a rectangular cuboid, albeit with rounded corners. Other shapes are conceivable.
  • the plate package 2 defines a surrounding external wall 4 which extends in a height or axial direction A between a top axial end and a bottom axial end.
  • the wall 4 has a given perimeter or contour at its bottom axial end. In the illustrated example, the wall 4 has essentially the same contour along its extent in the axial direction A.
  • the bottom axial end of the plate package 2 comprises or is provided with an essentially planar end surface 5 ( Figs 2-3 ), which may but need not conform to the contour of the wall 4 at the bottom axial end.
  • the end surface 5 extends in a lateral plane.
  • the plate package 2, and the end surface 5 extends between two longitudinal ends in a longitudinal direction L and between two transverse ends in a transverse direction T ( Fig. 2 ).
  • the heat transfer plates 3 have in their corner portions through-openings, which form inlet channels and outlet channels in communication with the flow passages for the first fluid and the second fluid. These inlet and outlet channels open in the end surface 5 of the plate package 2 to define separate portholes for inlet and outlet of the first and second fluids, respectively.
  • the end surface 5 has four portholes 6 ( Fig. 2 ).
  • the plate package 2 is permanently connected to two identical (in this example) mounting plates 7, which are arranged on a respective end portion of the end surface 5.
  • the mounting plates 7 are thereby separated in the longitudinal direction L, leaving a space free of material beneath the center portion of the plate package 2.
  • Each mounting plate 7 has two through-holes 8 which are mated with a respective pair of the portholes 6 of the plate package 2 to define inlet and outlet ports of the heat exchanger 1.
  • the mounting plates 7 are configured for attaching the heat exchanger 1 to an external suspension structure (not shown) such that the inlet and outlet ports mate with corresponding supply ports for the first and second medium on the external structure.
  • one or more seals may be provided in the interface between the mounting plate 7 and the external structure.
  • Each mounting plate 7 defines a mounting flange 9 that projects from the wall 4 and extends around the longitudinal end of the plate package 2. Bores 10 are provided in the mounting flange 9 as a means for fastening the heat exchanger 1 to the external structure. Threaded fasteners or bolts, for example, may be introduced into the bores 10 for engagement with corresponding bores in the external structure.
  • the plate package 2 and the mounting plates 7 are made of metal, such as stainless steel or aluminum. All the plates in the heat exchanger 1 are permanently connected to each other, preferably through melting of a metallic material, such as brazing, welding or a combination of brazing and welding. The plates in the plate package 2 may alternatively be permanently connected by gluing.
  • the mounting plates 7 are dimensioned, with respect to material, thickness and extent in the longitudinal and transverse directions, so as to have an adequate strength and stiffness to the static load that is applied to the mounting plates 7 when fastened on the external structure.
  • the static load which tends to deform the mounting plates 7, may originate from a combination of the weight of the heat exchanger 1, internal pressure applied by the media in the heat exchanger 1 and transferred to the mounting plates 7, and compression forces applied to the mounting plates 7, e.g. at the above-mentioned seals, via the fasteners and the bores 10. This static load tend to deform the mounting plates 7.
  • the mounting plates 7 are generally designed to have a significant thickness. As a non-limiting example, the thickness may be 15-40 mm.
  • the bottom of the plate package 2, on the other hand, is normally made of much thinner material.
  • the heat exchanger 1 is installed in an environment where vibrations are transferred to the mounting plate 7 via the external structure, the heat exchanger 1 also needs to be designed to account for the mechanical stresses caused by the cyclic loading of the vibrations, i.e. cyclic stresses.
  • cyclic stresses occur for heat exchangers that are mounted in vehicles, such as cars, trucks and ships.
  • the heat exchanger 1 is an oil cooler for an engine.
  • cyclic stresses are applied to a material, even though the stresses do not cause plastic deformation, the material may fail due to fatigue especially in local regions with high stress concentration.
  • the use of stiff thick mounting plates 7 connected to a plate package 2 with a relatively thin bottom is likely to lead to high concentrations of cyclic stress at the interface between the mounting plates 7 and the plate package 2, and possibly also within the plate package 2.
  • Embodiments of the present invention are designed to counteract stress concentration that may lead to fatigue failure.
  • the mounting plates 7 have dedicated slots 15 in the edge portion of the respective mounting plate 7.
  • the slots 15 are arranged to extend below the end surface 5 so as to intersect the surrounding wall 4 of the plate package 2, as seen in the normal direction to the end surface 5.
  • the slots 15 are arranged with their opening at selected intersection points 11 which are formed between the perimeter of the mounting plate 7 and the perimeter of the wall 4 of the plate package 2.
  • the "perimeter” designates the outer contour as seen in plan view.
  • the intersection points 11 are indicated by black dots.
  • Figs 5A-5B illustrate a mounting plate 7 in more detail.
  • the mounting plate 7 has a generally elongated shape with rounded corner portions, as seen in plan view.
  • the mounting plate 7 has essentially planar top and bottom surfaces 12, 13, where the top surface 12 forms an engagement surface to be permanently connected to the end surface 5 on the plate package 2, and the bottom surface 13 forms an engagement surface to be applied and fixed to the external supporting structure.
  • the through-holes 8 and bores 10 are formed to extend between the top and bottom surfaces 12, 13.
  • the top and bottom surfaces are connected by a peripheral edge surface 14.
  • the edge surface 14 is essentially planar and right-angled to the top and bottom surfaces 12, 13 and forms the above-mentioned edge portion.
  • the corner portions of the mounting plate 7 are connected by essentially straight contour lines, and the contour line of the edge surface 14 that extends across the plate package 2 ( Fig. 2 ) is designed to intersect the wall 4 at approximately right angles. This design is selected to minimize the width of the mounting plates 7 in the longitudinal direction L ( Fig. 2 ). Other designs are conceivable.
  • the slots 15 are located along the straight contour line that extends across the plate package 2.
  • Fig. 3B shows the juncture between the mounting plate 7 and the plate package 2 in greater detail, in a perspective from below, and is taken within the dashed rectangle 3B in Fig. 3A .
  • the slot 15 defines an elongated opening in the edge surface 14.
  • the opening has a width w in the peripheral direction of the edge surface 14 and a height h in the thickness direction of the mounting plate 7 (equal to the axial direction A, Fig. 1 ).
  • the mounting plate 7 is mounted to the end surface 5 of the plate package 1 such that the opening of the slot 15 intersects the wall 4.
  • further structures are located in the interface between the plate package 2 and the mounting plate 7. These structures are by formed a sealing plate 21 and an reinforcement plate 24, which are described below with reference to Figs 7-8 .
  • the elongated opening of the slot 15 is spaced from and generally parallel to the top surface 12, and thus to the end surface 5.
  • the slot 15 is located close to the top surface 12, so as to form a thinned lip of material between the slot 15 and the top surface 12.
  • This lip is at least partly attached to the end surface 5 and provides a locally increased flexibility for the mounting plate 7 in the region of the intersection point.
  • the lip has a uniform thickness along the width w of the slot 15 which may enable a more uniform distribution of stress.
  • the width w and height h of the respective slot 15 are of lesser importance for the stress distribution and can be selected within relatively broad limits.
  • the width and height may rather be selected to facilitate manufacture while ensuring that the mounting plate 7 has an adequate overall stiffness and strength.
  • the height h is about 5%-50% of the total thickness of the mounting plate 7, but it may fall outside this range.
  • the width w may be at least 2 mm, at least 5 mm or at least 10 mm.
  • Fig. 4A shows a cross-section in the longitudinal direction L, taken along the line A1-A1 in Fig. 2
  • Fig. 4B is a partial plan view of the mounting plate 7 at the location of the slot 15.
  • the slot 15 forms a blind hole, which is defined by a bottom wall 16 and two side walls 17, 18 which extend from the bottom wall 16 to the opening in the edge surface 14.
  • Figs 4A-4B illustrate a number of design parameters that may be adapted, in addition to the width w and the height h, to counteract stress concentration.
  • One such design parameter is the distance t1 between the slot 15 and the top surface 12, and thus the thickness of the above-mentioned lip.
  • the distance t1 is preferably small, e.g.
  • the slot 15 has a maximum depth d in the longitudinal direction L, i.e. between the bottom wall 16 and the opening in the edge surface 14. This depth d may depend on the shape of the bottom wall. In one example, the slot 15 has the same depth d along its width w. However, in the illustrated example, as seen in Fig. 4B , the bottom wall 16 follows the arc of a circle with a radius R1, as seen in a plane parallel to the end surface 5. The radius R1 is defined with respect to a center line C, which is spaced from the edge surface 14. This configuration of the bottom wall 16 may facilitate the manufacture of the slot 15.
  • the bottom wall 16 has a curved shape in cross-section transverse to the extent of the slot 15, i.e. in a plane perpendicular to the end surface 5 ( Fig. 4A ). Thereby, the bottom wall 16 forms a trough with smooth transitions to the side walls 17, 18. Such a shape of the bottom wall 16 may further counteract stress concentration.
  • the curvature of the bottom wall 16 is given by a radius R2.
  • the side walls 17, 18 extend essentially parallel to the top and bottom surfaces 12, 13 and thereby connect essentially at right angles to the edge surface 14 at the opening of the slot 15. Such a configuration may be preferred to simplify manufacture.
  • an alternative configuration that may reduce the stress concentration further is shown in Fig. 4C .
  • the side wall 17 meets the edge surface 14 at an angle ⁇ that exceeds 0°.
  • the angle ⁇ is defined with respect to the plane of the top surface 12.
  • the side wall 17 is flat and thus has a linear extent from the bottom wall 16 to the opening.
  • the angle ⁇ is given by the direction (tangent) of the side wall 17 at the opening, i.e. at the location where the side wall 17 meets the edge surface 14.
  • the angle ⁇ may be larger than 2°, 5° or 10° to achieve adequate stress distribution.
  • the angle ⁇ is preferably less than about 45°. This definition and choice of the angle ⁇ is applicable to all embodiments shown herein.
  • the slot 15 preferably has the same cross-sectional shape along its extent, i.e. along the width w in Fig. 3B .
  • the mounting plate 7 may be initially manufactured with a coherent edge surface 14, e.g. planar and right-angled as shown in the drawings, and the slots 15 may be provided by locally removing material from mounting plate 7 at the edge surface 14.
  • the slots 15 may be formed by machining, e.g. milling, grinding, boring or drilling.
  • the slot 15 in Figs 4A-4B may be formed by a milling cutter located to rotate around the center line C.
  • the heat exchanger 1 in Fig. 1 comprises some additional features that may serve to improve stability and durability.
  • Fig. 6A shows the juncture between the mounting plate 7 and the plate package 2 in greater detail and is taken within the dashed rectangle 6A in Fig. 1 .
  • a sealing plate 21 is connected to the stack of heat exchanger plates to define a bottom surface of the plate package 2.
  • the sealing plate 21, as shown in Fig. 7 is generally planar and has through-holes 22 at its corners to be mated with corresponding through-holes in the heat exchanger plates 3.
  • the perimeter of the sealing plate 21 is bent upwards to form a surrounding flange 23 which adapted to abut on and be fixed to a corresponding flange of an overlying heat exchanger plate, as is known in the art.
  • the perimeter of the sealing plate 21 generally conforms to the perimeter of the surrounding wall 4, although the surrounding flange 21 may project slightly beyond the perimeter of the surrounding wall 4 as defined by the heat exchanger plates.
  • the mounting plates 7 may be directly attached to the sealing plate 21.
  • the sealing plate 21 is an end plate that defines the end surface 5.
  • an additional plate 24 is attached intermediate the sealing plate 21 and the mounting plate 7 for the purpose of reinforcing the bottom surface of the plate package 2.
  • the end surface 5 is defined by this additional reinforcement or supporting plate 24.
  • the use of such a reinforcement plate 24 may be advantageous when the working pressure of one or both of the media conveyed through the heat exchanger 1 is high or when the working pressure for one or both of the media varies over time.
  • the reinforcement plate 24, which is shown in greater detail in Fig. 8 has a uniform thickness and defines through-holes 25 which are matched to the portholes in the plate package 2.
  • the perimeter of the reinforcement plate 24 may be essentially level with the perimeter of the sealing plate 21 or the perimeter of the wall 4 of the plate package 2.
  • the reinforcement plate 24 is adapted to locally project from the perimeter of the wall 4, and thus from the perimeter of the sealing plate 21.
  • the reinforcement plate 24 is provided with cutouts 26 that are located to extend in the longitudinal direction between the intersection points 11 on a respective transverse side of the plate package 2 so as to be essentially level with the axial wall 4.
  • the longitudinal end points of the cutouts 26 define a respective transition 27 to a projecting tab portion 28, where the transitions 27 are located to overlap the perimeter of the mounting plate 7 in proximity to the intersection points 11 and are shaped to be non-perpendicular to the perimeter of the mounting plate 7 at the overlap, as seen in a direction towards the bottom of the heat exchanger 1.
  • This configuration of the reinforcement plate 24 will locally decrease the stress in the reinforcement plate 24 at the intersection points 11.
  • the transitions 27 may e.g. form a bevel or a curve from the cutout 26 to the tab 28.
  • the tab portions 28 protrude from the plate package 2 to essentially co-extend with and abut against a respective mounting plate 7. This has been found to result in a favorable distribution of stress between the mounting plate 7, the reinforcement plate 24 and the sealing plate 21 especially at the corners of the plate package 2. It will also increase the strength of the joint between the reinforcement plate 24 and the mounting plate 7 due to the increased contact area between them.
  • the reinforcement plate 24 projects from the plate package 2 around its entire perimeter except for small notches that are located in the proximity of the intersection points 11 to provide transitions 27 that are appropriately shaped to be non-perpendicular to the perimeter of the mounting plate 7.
  • the design of the mounting plate 7, and the reinforcement plate 24 if present, may be optimized based on the general principles outlined above, by simulating the distribution of stress in the heat exchanger structure. Such simulations may serve to adapt one or more of the thickness and width of the mounting plates 7, the width w and the height h of the slots 15, the depth d of the slots 17, the thickness t1 of the attachment lip formed by the slot 15, as well as further parameters related to the internal shape of the slot 15, such as the above-mentioned parameters R1, R2 and ⁇ .
  • the simulations may be based on any known technique for numerical approximation of stress, such as the finite element method, the finite difference method, and the boundary element method.
  • a simulation of the stress distribution within the structure in Fig. 6A indicates that stresses are well-distributed without any significant peaks in the interface between the reinforcement plate 24 and the sealing plate 21.
  • the maximum stress levels are distributed along arrow L1, at which the stress values are approximately 100 N/mm 2 (MPa).
  • the simulation also indicates that stresses are equally well-distributed in the interface between the mounting plate 7 and the reinforcement plate 24, with maximum stress levels of approximately 80-90 N/mm 2 being distributed along arrow L2 in Fig. 6B , which is a reproduction of Fig. 3B .
  • the stress distribution has also been simulated, for the same vibration load condition, within a heat exchanger provided with a mounting plate 7 without slots in the edge surface 14, as shown in the enlarged perspective view in Fig. 6C .
  • the reinforcement plate 24 has the same extension as the sealing plate 21.
  • the simulation indicated a significant stress concentration at the juncture of the mounting plate 7 and the reinforcement plate 24, with a maximum stress value of about 310 N/mm 2 in region L3.
  • edge surface 14 may have any shape and angle to the top and bottom surfaces 12, 13 of the mounting plate 7.
  • the openings of the slots 15 need not exactly overlap the intersection points 11, as seen in the normal direction to the end surface 5.
  • the openings of the slots 15 may be separated from perimeter of the respective mounting plate 7 as seen in said normal direction, and thus from the intersection points 11 (which are given by the perimeter of the respective mounting plate 7).
  • the slots 15 when projected onto the lateral plane of the heat exchanger 1, the slots 15 may be spaced from the perimeter of the respective mounting plate 7.
  • FIG. 9A illustrates a mounting plate 7 with a slot 15 that extends from the nearest corner portion of the mounting plate 7 to a location further towards the center of the plate package 2 compared to the embodiment in Fig. 3B .
  • FIG. 9B shows such a mounting plate 7, in which a coherent slot 15 is formed to extend along the entire edge surface 14 that faces the other mounting plate 7.
  • top, bottom, vertical, vertical, etc merely refer to directions in the drawings and does not imply any particular positioning of the heat exchanger 1. Nor does this terminology imply that the mounting plates 7 need to be arranged on any particular end of the plate package 2.
  • the mounting plates may alternatively be arranged on the top axial end of the plate package 2 and may be permanently connected either to a sealing plate or to a reinforcement plate overlying the sealing plate.
  • the mounting plates 7 may be arranged on an end of the plate package 2 that lacks portholes or on which each or at least one porthole 6 is located intermediate the mounting plates 7.

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)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Claims (19)

  1. Plattenwärmetauscher, umfassend:
    eine Vielzahl von Wärmetauscherplatten (3), die gestapelt und dauerhaft verbunden sind, um ein Plattenpaket (2) zu bilden, das einen ersten und zweiten Fluidpfad für jeweils ein erstes Medium und ein zweites Medium getrennt durch die Wärmetauscherplatten (3) definiert, wobei das Plattenpaket (2) eine umgebende Außenwand (4) definiert, die sich in einer axialen Richtung (A) zwischen einem ersten und zweiten axialen Ende erstreckt,
    eine Endplatte (21; 24), die dauerhaft mit einem des ersten und zweiten axialen Endes verbunden ist, um eine Endfläche (5) bereitzustellen, die sich zwischen einem ersten und zweiten Längsende auf einer seitlichen Ebene erstreckt, die orthogonal zur axialen Richtung (A) ist, und
    zwei Befestigungsplatten (7), die dauerhaft mit einem jeweiligen Flächenabschnitt der Endfläche (5) jeweils am ersten Längsende und am zweiten Längsende verbunden sind, sodass die Befestigungsplatten (7) in einer Längsrichtung (L) auf der Endfläche (5) voneinander beabstandet sind, wobei jeder der Befestigungsplatten (7) gegenüberliegende flache Eingriffsflächen (12, 13) umfasst, die durch einen Randabschnitt (14) verbunden sind, der sich entlang dem Umfang der Befestigungsplatte (7) erstreckt, wobei jede der Befestigungsplatten (7) mit einer ihrer Eingriffsflächen (12, 13) dauerhaft verbunden mit der Endfläche (5) angeordnet ist, dadurch gekennzeichnet, dass sich der Umfang von jeder der Befestigungsplatten (7) teilweise über den Außenumfang der Endfläche (5) hinaus erstreckt, um einen Befestigungsflansch (9) zu definieren, und sich teilweise über die Endfläche (5) in Kontakt damit erstreckt, und mindestens ein Schlitz (15) im Randabschnitt (14) von jeder der Befestigungsplatten (7) gebildet und angeordnet ist, um sich unter der Endfläche (5) zu erstrecken, um den Umfang der umgebenden Außenwand (4) gesehen in einer normalen Richtung zur Endfläche (5) zu schneiden.
  2. Plattenwärmetauscher nach Anspruch 1, wobei der Randabschnitt eine Randfläche (14) umfasst, die sich zwischen den Eingriffsflächen (12, 13) erstreckt, wobei der mindestens eine Schlitz (15) in der Randfläche (14) gebildet ist.
  3. Plattenwärmetauscher nach Anspruch 2, wobei die Randfläche (14) im Wesentlichen flach und vorzugsweise senkrecht zu den Eingriffsflächen (12, 13) ist.
  4. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei sich der mindestens eine Schlitz (15) im Wesentlichen parallel zur Endfläche (5) erstreckt.
  5. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei sich der mindestens eine Schlitz (15) in der Nähe und beabstandet von der Eingriffsfläche (12, 13) befindet, die der Endfläche (5) gegenüberliegt.
  6. Plattenwärmetauscher nach Anspruch 5, wobei der mindestens eine Schlitz (15) durch eine Materialstärke (t1) von weniger als ca. 3 mm, vorzugsweise weniger als ca. 1 mm oder ca. 2 mm von der Eingriffsfläche (12, 13) beabstandet ist, die der Endfläche (5) gegenüberliegt.
  7. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei der mindestens eine Schlitz (15) konfiguriert ist, um ein Blindloch zu bilden, das eine längliche Öffnung im Randabschnitt (14) definiert, wobei das Blindloch (15) eine Bodenwand (16) und eine erste und zweite Seitenwand (17, 18) hat, wobei die erste und zweite Seitenwand (17, 18) in der axialen Richtung (A) voneinander beabstandet sind und sich von der Bodenwand (16) zu der länglichen Öffnung im Randabschnitt (14) erstrecken.
  8. Plattenwärmetauscher nach Anspruch 7, wobei die Bodenwand (16) einen gebogenen Abschnitt umfasst.
  9. Plattenwärmetauscher nach Anspruch 8, wobei der gebogene Abschnitt durch einen Radius (R2) definiert ist.
  10. Plattenwärmetauscher nach einem der Ansprüche 7-9, wobei die erste Seitenwand (17), die sich näher zu der Endfläche (5) als die zweite Seitenwand (18) befindet, mit dem Randabschnitt (14) an der länglichen Öffnung verbunden ist, um einen Winkel α zur seitlichen Ebene zu definieren, wobei 0°≤α≤45° und vorzugsweise 0°<α≤45° gesehen in einem Querschnitt senkrecht zur seitlichen Ebene.
  11. Plattenwärmetauscher nach Anspruch 10, wobei die erste Seitenwand (17) eine gerade Linie von der länglichen Öffnung zur Bodenwand (16) definiert, gesehen im Querschnitt senkrecht zur seitlichen Ebene.
  12. Plattenwärmetauscher nach einem der Ansprüche 7-11, wobei die Bodenwand (16) einen Bogenkreis definiert, gesehen in einem Querschnitt parallel zur seitlichen Ebene.
  13. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei der mindestens eine Schlitz einen kohärenten Schlitz (15) umfasst, der mindestens die Endfläche (5) in der Querrichtung (T) umspannt, um den Umfang der umgebenden Außenwand (4) an zwei gegenüberliegenden Seiten des Plattenpakets (2) zu schneiden, gesehen in der normalen Richtung zur Endfläche (5).
  14. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei die Endplatte (21) eine Versiegelungsplatte ist, die dauerhaft und versiegelnd mit einer der Wärmetauscherplatten (3) an einem des ersten und zweiten axialen Endes verbunden ist.
  15. Plattenwärmetauscher nach einem der Ansprüche 1-13, wobei die Endplatte (24) eine Verstärkungsplatte (24) ist, die dauerhaft mit einer Versiegelungsplatte (21) am Plattenpaket (2) verbunden ist, wobei die Endplatte (24) mindestens zwei Stützflansche (28) hat, die sich über den Umfang der umgebenden Außenwand (4) erstrecken, um an dem definierten Befestigungsflansch (9) durch die jeweilige Befestigungsplatte (7) anzustoßen.
  16. Plattenwärmetauscher nach Anspruch 15, wobei die Endplatte (24) entlang ihres Umfangs und gesehen in der normalen Richtung der Endfläche (5) konkave oder abgeschrägte Flächen (27) anliegend an den Stützflanschen (28) umfasst, wobei die konkaven oder abgeschrägten Flächen (27) angeordnet sind, um den Umfang der jeweiligen Befestigungsplatte (7) an Schnittpunkten (11) zu überlappen, wo der Umfang der jeweiligen Befestigungsplatte (7) den Umfang der umgebenden Außenwand (4) schneidet, und wobei die jeweilige konkave oder abgeschrägte Fläche (27) nicht senkrecht zum Umfang der Befestigungsplatte (7) an der Überlappung gesehen in der normalen Richtung zur Endfläche (5) ist.
  17. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei mindestens eine der Befestigungsplatten (7) mindestens ein Durchgangsloch (8) definiert, das sich zwischen den Eingriffsflächen (12, 13) erstreckt und mit einem entsprechenden Durchgangsloch (22; 25) ausgerichtet ist, das in der Endplatte (21; 24) definiert ist, und mit einem internen Kanal, der im Plattenpaket (2) definiert ist, um einen Einlass oder einen Auslass für das erste oder das zweite Medium zu bilden.
  18. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei der Befestigungsflansch (9) eine Vielzahl von Befestigungslöchern (10) umfasst, die angepasst sind, um Bolzen oder Stifte zum Befestigen des Plattenwärmetauschers aufzunehmen.
  19. Plattenwärmetauscher nach einem vorherigen Anspruch, wobei die Wärmetauscherplatten (3) durch Schmelzen eines metallischen Materials dauerhaft miteinander verbunden sind.
EP13198881.8A 2013-12-20 2013-12-20 Plattenwärmetauscher mit Befestigungsflansch Active EP2886995B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP13198881.8A EP2886995B1 (de) 2013-12-20 2013-12-20 Plattenwärmetauscher mit Befestigungsflansch
SE1650781A SE1650781A1 (sv) 2013-12-20 2014-12-11 Plate heat exchanger with mounting flange
PCT/EP2014/077422 WO2015091214A1 (en) 2013-12-20 2014-12-11 Plate heat exchanger with mounting flange
TW103144275A TWI539134B (zh) 2013-12-20 2014-12-18 具有安裝凸緣的板式熱交換器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13198881.8A EP2886995B1 (de) 2013-12-20 2013-12-20 Plattenwärmetauscher mit Befestigungsflansch

Publications (2)

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EP2886995A1 EP2886995A1 (de) 2015-06-24
EP2886995B1 true EP2886995B1 (de) 2017-03-08

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EP (1) EP2886995B1 (de)
SE (1) SE1650781A1 (de)
TW (1) TWI539134B (de)
WO (1) WO2015091214A1 (de)

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Publication number Priority date Publication date Assignee Title
JP7240931B2 (ja) * 2019-03-29 2023-03-16 株式会社荏原製作所 熱交換器の洗浄装置、および研磨装置

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Publication number Priority date Publication date Assignee Title
US7618598B2 (en) * 2004-11-29 2009-11-17 Modine Manufacturing Company Catalytic reactor/heat exchanger
US8181695B2 (en) 2005-10-05 2012-05-22 Dana Canada Corporation Reinforcement for dish plate heat exchangers
DE102007008459A1 (de) * 2006-02-22 2007-12-13 Behr Gmbh & Co. Kg Stapelscheibenwärmeübertrager
DE102009012784A1 (de) 2009-03-13 2010-09-16 Behr Gmbh & Co. Kg Wärmeübertrager
CN201440047U (zh) * 2009-07-23 2010-04-21 卡特彼勒公司 热交换器装置及使用该装置的机械

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Also Published As

Publication number Publication date
TWI539134B (zh) 2016-06-21
EP2886995A1 (de) 2015-06-24
WO2015091214A1 (en) 2015-06-25
SE1650781A1 (sv) 2016-06-03
TW201537136A (zh) 2015-10-01

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