• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    A heat exchanger plate (1) for a plate heat exchanger comprises a heat exchanger area (4) extending in parallel with an extension plane and comprising a primary corrugation (10). The heat exchanger area comprises at least three sides (5, 6). A longitudinal central axis (x) extends in parallel with the extension plane through at least one of the sides. A plurality of portholes (9) extends through the heat exchanger area. An edge flange (8) extends outside and around the heat exchanger area along the sides. The edge flange is inclined in relation to the extension plane. The edge flange comprises a secondary corrugation (20) of ridges (21) and valleys (22).
    公开号:SE1651142A1
    申请号:SE1651142
    申请日:2016-08-25
    公开日:2018-02-26
    发明作者:Romlund Jens
    申请人:Alfa Laval Corp Ab；
    IPC主号:
    专利说明:

    A heat exchanger plate, and a plate heat exchangerTECHNICAL FIELD OF THE INVENTION The present invention refers to a heat exchanger plate for a plateheat exchanger, the heat exchanger plate comprising a heat exchanger area extending in parallel with an extensionplane and comprising a primary corrugation and at least threesides, a longitudinal central axis extending in parallel with the extensionplane through at least one of the sides, a plurality of portholes extending through the heat exchangerarea, and an edge flange extending outside and around the heat exchangerarea along the sides, wherein the edge flange is inclined inrelation to the extension plane.
    The invention also refers to a plate heat exchanger comprising aplurality of heat exchanger plates.
    BACKGROUND OF THE INVENTION AND PRIOR ART A heat exchanger plate of this kind is disclosed in US-8,061,416.One problem with such heat exchanger plates of the prior art isthat the plates after the pressing operation will have a slightlycurved, banana-like shape when seen from the side along thelongitudinal central axis. This bending is due to the spring-backof the corrugated heat exchanger area after the pressingoperation has been finished, and the fact that the inclined edgeflange has a high stiffness. The stiff edge flange does not permitany spring-back corresponding to the one of the heat exchangerarea. The curved, and relatively rigid, shape is disadvantageouswhen the plate heat exchanger is assembled.
    EP-2370773 discloses another heat exchanger plate comprisinga corrugated heat exchanger area and an inclined edge flange extending outside and around the heat exchanger area. Areinforcement portion having a pressed pattern, comprising upperand lower surfaces, is provided outside the edge flange. Thereinforcement portion extends along a plane parallel to theextension plane of the heat exchanger plate.
    SUMMARY OF THE INVENTION The object of the present invention is to remedy the problemsdiscussed above. ln particular, it is aimed at a heat exchangerplate having a more flat extension after the pressing operationhas been finished.
    This object is achieved by the heat exchanger plate initiallydefined, which is characterized in that the inclined edge flangecomprises a secondary corrugation of ridges and valleys.
    The secondary corrugation will provide the inclined edge flangewith an elasticity at least along the longitudinal central axis.
    The heat exchanger plate will thus have a flat or plane extensionin parallel with the extension plane after the pressing operationhas been finished and before the heat exchanger plate is to bestacked onto other heat exchanger plates of a plate heatexchanger. The previous slightly curved shape will be avoided.The inclined edge flange will have a reduced stiffness so thatspring-back of both the heat exchanger area and the inclinededge flange is permitted.
    The primary corrugation may have various geometrical shapes,and may, for instance, comprise or consist of ridges and valleys,dimples or similar spot shaped depressions and/or protrusions.
    The corrugated edge flange makes the heat exchanger plate lesssensitive to bending of the plate. lf the heat exchanger plate isbent greatly, no dents or other permanent deformation will remain, but the heat exchanger plate may return to the originalshape.
    The heat exchanger plate of the present invention will alsoprovide an improved resistance against thermal fatigue along thelongitudinal central axis of the extension plane, an improved burstpressure resistance due to larger brazing surface area in thedirection perpendicular to the extension plane, and an improvedpressure fatigue resistance.
    The secondary corrugation of the edge flange also contributes toan improved locking of the heat exchanger plates when they arestacked on each other. The position of the heat exchanger platesrelative to each other is determined. There is no, or a reduced,risk that the heat exchanger plates are locked against each otherin an incorrect position, which means that the risk of missing ordefect brazing points is reduced.
    Since the secondary corrugation is elastic and flexible, the heatexchanger plates are more flexible and thus easily stacked ontoeach other when the plate heat exchanger is assembled.
    The corrugated edge flanges of the heat exchanger plates mayflex to a tight abutment against each other. With a smallinclination angle of the edge flange, a close fit ensures tightabutment and material contact.
    Thanks to the secondary corrugation of the edge flange, aturbulent flow, or more turbulent flow, is obtained along edgeflange. Such turbulent flow impedes bypass along and in theproximity of the edge flange, and increases the alpha value of theplate heat exchanger. ln addition, the secondary corrugation of the edge flange maycause a turbulent flow around ports, which impedes freezing inthese areas.
    A further advantage of the secondary corrugation is that it is gripfriendly, which means that a plate heat exchanger having heatexchanger plates with the secondary corrugation will be easier togrip and hold along the long sides.
    Thanks to the secondary corrugation of the edge flange, the plateheat exchanger will present a larger surface towards theenvironment, which means that cooling and/or heating may bemore rapid.
    According to an embodiment of the invention, the ridges andvalleys of the secondary corrugation extend along a secondarydirection away from extension plane of the heat exchanger area.The secondary direction crosses the extension plane.
    According to a further embodiment of the invention, the edgeflange has a root end at the heat exchanger area, and an outerend, wherein the edge flange is inclined from the root end to theouter end. Advantageously, the edge flange may be inclined withan inclination angle that is constant from the root end to the outerend.
    According to a further embodiment of the invention, the primarycorrugation extends to the root end of the edge flange. Forinstance, ridges and valleys of the primary corrugation mayextend to the root end of the edge flange.
    According to a further embodiment of the invention, the ridgesand the valleys of the secondary corrugation extend from the rootend to the outer end.
    According to a further embodiment of the invention, the edgeflange comprises a transition zone, which extends between theprimary corrugation and the secondary corrugation, wherein the secondary corrugation extends from the transition zone to theouter end.
    According to a further embodiment of the invention, the primarycorrugation comprises ridges and valleys.
    According to a further embodiment of the invention, the ridges ofthe primary corrugation extend into and continue in a respectiveone of the ridges of the secondary corrugation.
    According to a further embodiment of the invention, the primarycorrugation has a primary pitch and the secondary corrugationhas a secondary pitch. The primary pitch may be equal to thesecondary pitch.
    According to a further embodiment of the invention, the ridges ofthe primary corrugation are disconnected from the ridges of thesecondary corrugation. Thus, the transition zone may have nocorrugation or provide an even surface between the heatexchanger area and the edge flange.
    According to a further embodiment of the invention, primary pitchdiffers from the secondary pitch.
    According to a further embodiment of the invention, the ridges ofthe primary corrugation are shifted in relation to the ridges of thesecondary corrugation.
    According to a further embodiment of the invention, the ridgesand va|eys of the primary corrugation extend along a primarydirection crossing the longitudinal central axis. For instance, theridges and va|eys may extend along one direction from one of thelong sides to the other long side, or the ridges and va|eys mayextend along two directions which meet at the longitudinal centralaxis, thus forming a fishbone pattern.
    According to a further embodiment of the invention, the at leastthree sides comprise two opposite long sides and two oppositeshort sides.
    According to a further embodiment of the invention, the secondarycorrugation is provided on the edge flange at least along the longsides, or along the whole length of the long sides.
    According to a further embodiment of the invention, the secondarycorrugation provided on the edge flange along the short sides.
    According to a further embodiment of the invention, the shortsides and the long sides are connected to each other by fourcurved corners, wherein the secondary corrugation is provided onthe edge flange along the curved corners. The secondarycorrugation of the edge flange, especially at the corners, providesa better handling of excess material of the edge flange. Thesecondary corrugation forms a controlled folding of the edgeflange. Thus, undesired folds and portions of thicker material asa result of the pressing operation can be avoided. The pressingoperation may be performed without any plate holders holding theheat exchanger plate during the pressing operation.
    The object is also achieved by the plate heat exchanger initiallydefined, comprising a plurality of heat exchanger plates asdefined above.
    The plate heat exchanger according to the invention will takeadvantage of the technical advantages and properties of the heatexchanger plates explained above. Although the individual heatexchanger plates according to the invention has a greaterflexibility, the brazed plate heat exchanger will have a higherbending stiffness and higher rigidity.
    According to a further embodiment of the invention, the heatexchanger plates are permanently joined to each other. Such permanent joining may be obtained through bonding, brazing,welding, gluing etc. Thanks to the secondary corrugation and theflexibility of the edge flange, less deadweight is needed to be puton the plate heat exchanger during the brazing process.
    According to a further embodiment of the invention, the ridges ofthe secondary corrugation of one of the heat exchanger platesadjoin, or abut, the ridges of the secondary corrugation of the heatexchanger plates provided adjacent to said one heat exchangerplate. More precisely, the whole surface of the edge flange of oneheat exchanger plate may thus adjoin the whole surface of theedge flange of the adjacent heat exchanger plate or plates. Thiscontributes to the improved stiffness and improved strength of theplate heat exchanger according to the invention.
    BRIEF DESCRIPTION OF THE DRAWINGSThe present invention is now to be explained more closely through a description of various embodiments and with reference to thedrawings attached hereto.
    Fig 1 discloses a plan view of a plate heat exchangeraccording to a first embodiment of the invention.
    Fig 2 discloses a longitudinal section through the plate heatexchanger along the line ll-ll in Fig 1.
    Fig 3 discloses a side view of the plate heat exchanger inFig 1.
    Fig 4 discloses a plan view of a heat exchanger plate of theplate heat exchanger in Fig 1.
    Fig 5 discloses a side view of the heat exchanger plate inFig 4.
    Fig 6 discloses a perspective view of a part of an edgeflange of the heat exchanger plate in Fig 4.
    Fig 7 discloses a side view of a heat exchanger plate of a second embodiment of the invention.
    Fig 8 discloses a plane view of a heat exchanger plateaccording to a third embodiment of the invention.Fig9 discloses a side view of a heat exchanger plate according to a fourth embodiment of the invention.DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS Figs 1 to 3 disclose a plate heat exchanger comprising a pluralityof heat exchanger plates 1 arranged beside each other in theplate heat exchanger. The heat exchanger plates 1 arepermanently joined to each other. ln the embodiments disclosed,the heat exchanger plates are permanently joined to each otherthrough brazing. lt should be noted that other joining techniquesare also possible, such as bonding, welding, gluing etc.. The heatexchanger plates 1 may also be non-permanently joined to eachother, for instance by means of tie bolts.
    Each of the heat exchanger plates 1 extends in parallel with anextension plane p.
    The heat exchanger plates 1 are arranged side by side in such ina way that first plate interspaces 2 for a first fluid and secondplate interspaces 3 for a second fluid are formed.
    The first plate interspaces 2 and the second plate interspaces 3are provided side by side in an alternating order in the plate heatexchanger, as can be seen in Fig 2.
    Each of the heat exchanger plates 1 comprises a heat exchangerarea 4 extending in parallel with the extension plane p, see Fig 4.
    The heat exchanger area 4 may comprise, or be limited by, atleast three sides, and may have a triangular, rectangular,pentagonal or any other suitable shape. ln the embodiments disclosed, the heat exchanger plates 1 arerectangular, or substantially rectangular, with two opposite longsides 5 and two opposite short sides 6. The short sides 6 and thelong sides 5 are connected to each other by four curved corners7. A longitudinal central axis x extends in parallel with theextension plane p through the short sides 6. As can be seen inFig 4, the longitudinal central axis x may be parallel with the longsides 5.
    The heat exchanger plate 1 also comprises an edge flange 8,which extends outside and around the heat exchanger area 4along the sides, i.e. in the embodiments disclosed along the longsides 5, the short sides 6 and the curved corners 7. The edgeflange 8 is inclined in relation to the extension plane p, with anangle oi of inclination, see Fig 5.
    The heat exchanger plate 1 also comprises four portholes 9,which extend through the heat exchanger area 4.
    The heat exchanger area 4 comprises a primary corrugation 10.ln the embodiments disclosed, the primary corrugation comprisesor consists of ridges 11 and valleys 12, see Fig 4.
    The primary corrugation 10 may form various patterns, forinstance a diagonal pattern, a fishbone pattern, etc. as is knownin the art of plate heat exchangers. ln the embodiments disclosed,the primary corrugation 10 forms a fishbone pattern of the ridges11 and the valleys 12 extending along a primary direction crossingthe longitudinal central axis x. The ridges 11 and valleys 12 forma positive angle of inclination on one side of the longitudinalcentral axis x and a corresponding negative angle of inclinationon the other of the longitudinal central axis x.
    Other geometrical shapes of the primary corrugation 10 are alsopossible, for instance a corrugation of dimples or other spotshaped depressions and/or protrusions.
    As can be seen in Fig 4, the ridges 11 and valleys 12 of theprimary corrugation 10 extend to the long sides 5.
    The edge flange 8 of the heat exchanger plate 1 comprises asecondary corrugation 20 of ridges 21 and valleys 22.
    The ridges 21 and valleys 22 of the secondary corrugation 20extend along a secondary direction y away from extension planep of the heat exchanger area 4, see Fig 5. ln the first embodiment, the secondary corrugation 20 is providedon the edge flange 8 along the long sides 5, the short sides 6 andthe curved corners 7.
    The edge flange 8 has a root end 25 at the heat exchanger area4 and an outer end 26. The edge flange 8 is inclined from the rootend 25 to the outer end 26, especially with the above mentionedangle d of inclination.
    The ridges 21 and the valleys 22 of the secondary corrugation 20extend from the root end 25 to the outer end 26 as can be seenin Fig 6, which discloses more closely the secondary corrugation20 of the edge flange 8.
    The primary corrugation 10 extends to the root end 25 of the edgeflange 8, as can be seen in Fig 4. ln the first embodiment, the ridges 11 of the primary corrugation10 extend into and continue in a respective one of the ridges 21of the secondary corrugation 20, and the valleys 12 of the primarycorrugation 10 extend into and continue in a respective one of thevalleys 22 of the secondary corrugation 20, see Fig 4.
    Furthermore, the primary corrugation 10 may have a primary pitchP1 and the secondary corrugation 20 a secondary pitch P2. The 11 primary pitch P1 is the distance between adjacent ridges 11, oradjacent valleys 12, along a line parallel with the longitudinalcentral axis x, see Fig 4. The secondary pitch P2 is the distancebetween adjacent ridges 21, or adjacent valleys 22, perpendicularto the secondary direction y, see Figs 4 and 5. ln the firstembodiment, the primary pith P1 is equal to the secondary pitchP2.
    As mentioned above, the plate heat exchanger is a brazed plateheat exchanger. The individual heat exchanger plates 1 arecompression molded to obtain the shape disclosed and describedherein. The heat exchanger plates 1 are the stacked onto eachother with a sheet of braze material between each heat exchangerplate 1. Moreover, the heat exchanger plates 1 are stacked ontoeach other so that the ridges 21 of the secondary corrugation 20of one of the heat exchanger plates 1 adjoin the ridges 21 of thesecondary corrugation 20 of the heat exchanger plates 1 providedadjacent to said one heat exchanger plate 1. ln the same way, thevalleys 22 of the secondary corrugation 20 of one of the heatexchanger plates 1 adjoin the valleys 22 of the secondarycorrugation 20 of the heat exchanger plates 1 provided adjacentto said one heat exchanger plate 1. The whole surface of the edgeflange 8 of one heat exchanger plates 1 may thus adjoin the wholesurface of the edge flange 8 of the adjacent heat exchanger plate1 or plates 1. ln the plate heat exchanger with heat exchanger plates 1according to the first embodiment, the portholes 9 of the heatexchanger plates 1 may form a first inlet port 31 for the first fluidto the first plate interspaces 2, a first outlet port 32 for the firstfluid from the first plate interspaces 2, a second inlet port 33 forthe second fluid to the second plate interspaces 3, and a secondoutlet port 34 for the second fluid from the second plateinterspaces 3, see Fig 1. Each of the ports 31-34 may comprise aconnection pipe, as can be seen in Figs 2 and 3. 12 The outermost heat exchanger plate 1, at which the ports 31-34are provided, may form frame plate, and the opposite outermostheat exchanger plate 1 may form a pressure plate.
    The stack of heat exchanger plates 1 are then brazed by beingheated to a suitable temperature. The stack is held togetherduring the heating and following cooling by a deadweight providedon top of the stack.
    Fig 7 discloses a heat exchanger plate 1 according to a secondembodiment, which differs from the first embodiment in that, theedge flange 8 comprises a transition zone 28, which extendsaround the heat exchanger area 4. The transition zone 28 isprovided and extends between the primary corrugation 10 and thesecondary corrugation 20. The transition zone 28 starts at theroot end 25 and extends towards the outer end 26. The secondarycorrugation 20 thus extends from the transition zone 28 to theouter end 26 of the edge flange 8. ln the second embodiment, the ridges 11 and the valleys 12 ofthe primary corrugation 10 are thus disconnected from the ridges21 and valleys 22 of the secondary corrugation 20.
    Fig 8 discloses a heat exchanger plate 1 according to a thirdembodiment, which differs from the first embodiment in that thesecondary corrugation 20 is provided on the edge flange 8 alongthe long sides 5 only.
    Fig 9 discloses a heat exchanger plate according to a fourthembodiment, which differs from the second embodiment in thatthe primary pitch P1 is shorter than the secondary pitch P2. Theridges 11 of the primary corrugation 10 are thus not aligned withthe ridges 21 of the secondary corrugation 20, and the valleys 12of the primary corrugation 10 are not aligned with the valleys 22of the secondary corrugation 20. 13 The invention is not limited to the embodiments disclosed, butmay be varied and modified within the scope of the followingclaims.
    The invention is applicable to all permanently joined plate heatexchangers, especially brazed plate heat exchanger, not onlythose for two fluids, but also plate heat exchangers for more thantwo fluids, for instance three fluids.
    Furthermore, the heat exchanger plate may then have more orless than four portholes, for instance two portholes, six portholesetc.
    权利要求:
    Claims (17)
    [1] 1. A heat exchanger plate (1) for a plate heat exchanger, theheat exchanger plate (1) comprising a heat exchanger area (4) extending in parallel with an extensionplane (p) and comprising a primary corrugation (10) and at leastthree sides (5, 6), a longitudinal central axis (x) extending in parallel with theextension plane (p) through at least one of the sides (5), a plurality of portholes (9) extending through the heat exchangerarea (4), and an edge flange (8) extending outside and around the heatexchanger area (4) along the sides (5, 6), wherein the edge flange(8) is inclined in relation to the extension plane (p),characterized in that the edge flange (8) comprises a secondarycorrugation (20) of ridges (21) and valleys (22).
    [2] 2. A heat exchanger plate according to claim 1, wherein theridges (21) and valleys (22) of the secondary corrugation (20)extend along a secondary direction (y) away from extension plane(p) of the heat exchanger area (4).
    [3] 3. A heat exchanger plate according to any one of claims 1 and2, wherein the edge flange (8) has a root end (25) at the heatexchanger area (4), and an outer end (26), wherein the edgeflange (8) is inclined from the root end (25) to the outer end (26).
    [4] 4. A heat exchanger plate according to claim 3, wherein theprimary corrugation (10) extends to the root end (25) of the edgeflange (8).
    [5] 5. A heat exchanger plate according to claim 4, wherein theridges (21) and the valleys (22) of the secondary corrugation (20)extend from the root end (25) to the outer end (26).
    [6] 6. A heat exchanger plate according to claim 4, wherein theedge flange (8) comprises a transition zone (28), which extendsbetween the primary corrugation (10) and the secondarycorrugation (20), and wherein the secondary corrugation (20)extends from the transition zone (28) to the outer end (26).
    [7] 7. A heat exchanger plate according to any one of thepreceding claims, wherein the primary corrugation (10) comprisesridges (11) and valleys (12).
    [8] 8. A heat exchanger plate according to claim 7, wherein theridges (11) of the primary corrugation (10) extend into andcontinue in a respective one of the ridges (21) of the secondarycorrugation (20).
    [9] 9. A heat exchanger plate according to claim 7, wherein theridges (1 1) of the primary corrugation (10) are disconnected fromthe ridges (21) of the secondary corrugation (20).
    [10] 10. A heat exchanger plate according to any one of claims 7 to9, wherein the ridges (9) and valleys (10) of the primarycorrugation (8) extend along a primary direction crossing thelongitudinal central axis (x).
    [11] 11. A heat exchanger plate according to any one of thepreceding claims, wherein the at least three sides (5, 6) comprisetwo opposite long sides (5) and two opposite short sides (6),
    [12] 12. A heat exchanger plate according to claim 11, wherein thesecondary corrugation (20) is provided on the edge flange (8)along the long sides (5).
    [13] 13. A heat exchanger plate according to any one of claims 11and 12, wherein the secondary corrugation (20) provided on theedge flange (8) along the short sides (6). 16
    [14] 14. A heat exchanger plate according to any one of claims 11 to13, wherein the short sides (6) and the long sides (5) areconnected to each other by four curved corners (7), and whereinthe secondary corrugation (20) is provided on the edge flange (8)along the curved corners (7).
    [15] 15. A plate heat exchanger comprising a plurality of heatexchanger plates (1) according to any one of the precedingclaims.
    [16] 16. A plate heat exchanger according to claim 15, wherein theheat exchanger plates (1) are permanently joined to each other.
    [17] 17. A plate heat exchanger according to any one of claims 15and 16, wherein the ridges (21) of the secondary corrugation (20)of one of the heat exchanger plates (1) adjoin the ridges (21) ofthe secondary corrugation (20) of the heat exchanger plates (1)provided adjacent to said one heat exchanger plate (1).
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE532344C2|2007-12-21|2009-12-22|Alfa Laval Corp Ab|Gasket support in heat exchanger and heat exchanger including gasket support|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651142A|SE541261C2|2016-08-25|2016-08-25|A heat exchanger plate, and a plate heat exchanger|SE1651142A| SE541261C2|2016-08-25|2016-08-25|A heat exchanger plate, and a plate heat exchanger|
    DK17186703.9T| DK3287731T3|2016-08-25|2017-08-17|HEAT EXCHANGE PLATE AND PLATE HEAT EXCHANGERS|
    EP17186703.9A| EP3287731B1|2016-08-25|2017-08-17|A heat exchanger plate, and a plate heat exchanger|
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