EP2730880B1 - Manufacturing Process for a Plate Heat Exchanger Made of Plastic - Google Patents

Manufacturing Process for a Plate Heat Exchanger Made of Plastic Download PDF

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Publication number
EP2730880B1
EP2730880B1 EP12191858.5A EP12191858A EP2730880B1 EP 2730880 B1 EP2730880 B1 EP 2730880B1 EP 12191858 A EP12191858 A EP 12191858A EP 2730880 B1 EP2730880 B1 EP 2730880B1
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EP
European Patent Office
Prior art keywords
plate
heat exchanger
individual plates
welding
plates
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EP12191858.5A
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German (de)
French (fr)
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EP2730880A1 (en
Inventor
Christian Hirsch
Frank Sabaczuk
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Zehnder Group International AG
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Zehnder Group International AG
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Priority to LTEP12191858.5T priority Critical patent/LT2730880T/en
Priority to DK12191858.5T priority patent/DK2730880T3/en
Application filed by Zehnder Group International AG filed Critical Zehnder Group International AG
Priority to ES12191858T priority patent/ES2865176T3/en
Priority to HUE12191858A priority patent/HUE054160T2/en
Priority to PL12191858T priority patent/PL2730880T3/en
Priority to EP12191858.5A priority patent/EP2730880B1/en
Priority to SI201231918T priority patent/SI2730880T1/en
Priority to EA201590784A priority patent/EA037914B9/en
Priority to CN201380068662.6A priority patent/CN105008849A/en
Priority to PCT/IB2013/002500 priority patent/WO2014072804A1/en
Publication of EP2730880A1 publication Critical patent/EP2730880A1/en
Application granted granted Critical
Publication of EP2730880B1 publication Critical patent/EP2730880B1/en
Priority to HRP20210789TT priority patent/HRP20210789T1/en
Active legal-status Critical Current
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
    • 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

Definitions

  • the invention relates to a method for producing a plate heat exchanger made of plastic, in particular an air-to-air plate heat exchanger, with flow channels through which a first and a second medium can flow, for the first medium between individual plates made of plastic that are connected to form a pair of plates and for the second medium are formed between pairs of plates connected to one another to form a stack of plates.
  • Plate heat exchangers of the type mentioned at the beginning i.e. of the generic type, are known per se from the prior art. They are used to transfer heat from a first medium to a second medium. The media can be guided past one another in cocurrent or countercurrent or in cross-flow.
  • the plate heat exchanger provides corresponding flow channels for the first medium on the one hand and for the second medium on the other hand. These are formed between the individual plates of the plate heat exchanger, it being generically provided that these individual plates consist of plastic.
  • two individual plates form a plate pair.
  • the individual plates are spaced apart from one another and form a flow channel for a first medium between them.
  • Two such plate pairs together form a plate stack, the plate pairs being spaced apart from one another, thus creating a flow channel for the second medium is provided.
  • the plate heat exchanger has a plurality of individual plates, individual plates being combined to form pairs of plates and pairs of plates to form a stack of plates.
  • the D1 ( WO 2008/025359 A2 ) discloses a plate heat exchanger which provides flow channels for a first and a second medium.
  • the first flow channel is formed between individual plates connected to form a plate pair and the second flow channel is formed between plate pairs connected to form a plate stack.
  • the connection of the individual plates to a plate pair and the plate pairs to a plate stack takes place by means of pressure welding.
  • the individual plates are first formed by vacuum forming and then joined to one another by pressure welding to form pairs of plates.
  • the pairs of plates are continuously stacked on top of each other and connected to one another by pressure welding.
  • Document D2 ( WO 86/07133 A1 ) describes a plate heat exchanger made of plastic.
  • the flow channels through which a first and a second medium can flow are formed by welding individual plates, with the successive individual plates being rotated 90 degrees and then connected to one another by ultrasonic or radio wave welding. In this case, only flow channels arise between two individual plates connected to one another, but no flow channels that are formed between plate pairs connected to one another to form a stack of plates.
  • the D4 ( US 2001/0032714 A1 ) discloses a plate heat exchanger made of plastic, in which two different individual plates are alternately stacked on top of one another and successively pressure-welded to one another.
  • the D5 ( WO 02/090858 ) describes a plate heat exchanger made of a plastic strip of connected plates. To form the plate heat exchanger, the band is folded in such a way that the connected plates are arranged alternately one above the other. The flow paths for the two different media are formed by successive plates. The individual plate elements are connected to one another by gluing or, preferably, thermal welding.
  • D6 discloses a pair of plates made of plastic for a plate heat exchanger, in which deep-drawn plastic foils are joined to a pair of plates by laser welding.
  • Another citation D9 discloses laser-welded plate pairs, which are stacked to form a plate heat exchanger and then in turn connected to one another by laser welding to form a plate heat exchanger. D9 is silent about the material of the heat exchanger plates.
  • the object of the invention is to propose a manufacturing method that increases the working speed of the manufacturing process and at the same time offers good manufacturing quality for the plastic plate heat exchangers to be manufactured.
  • a process for producing a plate heat exchanger from plastic according to independent claim 1 is proposed to achieve the above-mentioned object.
  • the implementation of the method according to the invention allows a high degree of automation. In contrast to the prior art, faster production is achieved, and this while at the same time protecting the environment, since the use of chemical substances in the form of plastic glue or glue can be dispensed with. In addition, continuous production is permitted since there is no need for intermediate storage for the purpose of drying out or setting the plastic adhesive.
  • the individual plates and the plate pairs are welded to one another along two mutually opposite longitudinal edges. Edge tightness for the media is thus achieved with high accuracy.
  • a plate heat exchanger is created for counter-current, direct-current or cross-flow operation.
  • the plate heat exchanger obtained in this way is particularly suitable as an air-to-air plate heat exchanger.
  • other media can also be used in combination with the plate heat exchanger according to the invention.
  • the plate heat exchanger is made of plastic, it is particularly suitable for media that are highly corrosive.
  • the pairs of plates forming the individual plates are stacked with one another without being connected to form a stack of plates.
  • a laser welding machine is used that is equipped with a welding device that is designed for the simultaneous connection of all the individual plates that make up a stack of plates.
  • a welding device that is designed for the simultaneous connection of all the individual plates that make up a stack of plates.
  • a corresponding receiving device is used for stacking the panels, into which the individual panels to be welded together are gradually inserted to form a stack.
  • the shape of the stack formed in this way corresponds to that of the later heat exchanger.
  • a cage-like arrangement is provided as the receiving device into which the individual plates are inserted to form a stack.
  • This has a bottom and a plurality of guides formed parallel to one another, which, starting from the floor, extend orthogonally to the floor surface provided by the floor. Thanks to these guides, an exact positioning of the individual plates relative to one another is permitted.
  • the guides ensure in particular that the edge edges of adjacent individual plates to be welded to one another are aligned running parallel to one another.
  • a laser welding process is used as the welding process. It is preferred that a laser beam welding the individual plates to one another is guided at an acute angle along plate edges to be welded. This enables welding on the outer edge of two plate edge edges. The result is plate pairs that are laser-welded to one another along the outer edges of two opposite longitudinal edges.
  • a gas flow is applied to the welding area during a welding process.
  • An air stream or an inert gas stream can be used as the gas stream.
  • the gas flow hits the plate edges in the currently heated welding point or area, i.e. the longitudinal edges of the individual plates or flows past them. A cooling of the welding area can thus be achieved.
  • a gas stream can be applied to the welding area according to a first alternative by means of a blower nozzle.
  • a displaceable blower nozzle is used which, when used, is aligned in the direction of the welding area and covers it with a gas stream.
  • the laser used is preferably moved together with the blower nozzle.
  • a common movement device can then be provided for the laser on the one hand and the blow nozzle on the other hand.
  • the gas flow is not applied by means of a blower nozzle, but by means of generating negative pressure.
  • a negative pressure is applied from outside the plate stack to be welded, as a result whose air located between the individual plates is sucked off, as a result of which a gas flow is applied to the welding area in the manner already described.
  • a suction nozzle is preferably used to generate a vacuum. This can preferably be designed to be movable together with a laser beam for laser welding.
  • Fig. 1 shows in a purely schematic representation a plate heat exchanger W which can be manufactured according to the method according to the invention.
  • the plate heat exchanger W is designed as a countercurrent heat exchanger.
  • Fig. 1 As can be seen, two individual plates each form a pair of plates P, the flow channel SK provided by a pair of plates serving for the first medium I to flow through.
  • the plate pairs P together form a plate stack S.
  • the flow channel SK which is formed between two pairs of plates P, serves to guide the second medium II through.
  • the flow directions of the first medium I and the second medium II are in Fig. 1 exemplified by arrows.
  • the individual plates E forming a plate pair P on the one hand and the plate pairs P forming a plate stack S on the other hand are connected to one another by means of laser welding. It is provided that the individual plates E of the plate heat exchanger W to be welded together in one work step, for which purpose a welding machine is used in which all the individual plates E of the plate heat exchanger W are stacked and then laser-welded to one another to form the individual flow channels SK.

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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)
  • Laser Beam Processing (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Plattenwärmetauschers aus Kunststoff, insbesondere eines Luft-Luft-Plattenwärmetauschers, mit von einem ersten und einem zweiten Medium durchströmbaren Strömungskanälen, die für das erste Medium zwischen zu einem Plattenpaar miteinander verbundenden Einzelplatten aus Kunststoff und für das zweite Medium zwischen zu einem Plattenstapel miteinander verbundenen Plattenpaare ausgebildet sind.The invention relates to a method for producing a plate heat exchanger made of plastic, in particular an air-to-air plate heat exchanger, with flow channels through which a first and a second medium can flow, for the first medium between individual plates made of plastic that are connected to form a pair of plates and for the second medium are formed between pairs of plates connected to one another to form a stack of plates.

Plattenwärmetauscher der eingangs genannten, d.h. gattungsgemäßen Art sind aus dem Stand der Technik an sich bekannt. Sie dienen dem Wärmeübergang von einem ersten Medium auf ein zweites Medium. Dabei können die Medien im Gleich- oder Gegenstrom oder im Querstrom aneinander vorbeigeführt werden.Plate heat exchangers of the type mentioned at the beginning, i.e. of the generic type, are known per se from the prior art. They are used to transfer heat from a first medium to a second medium. The media can be guided past one another in cocurrent or countercurrent or in cross-flow.

Der Plattenwärmetauscher stellt für das erste Medium einerseits sowie für das zweite Medium andererseits entsprechende Strömungskanäle bereit. Diese sind zwischen den einzelnen Platten des Plattenwärmetauschers ausgebildet, wobei gattungsgemäß vorgesehen ist, dass diese Einzelplatten aus Kunststoff bestehen.The plate heat exchanger provides corresponding flow channels for the first medium on the one hand and for the second medium on the other hand. These are formed between the individual plates of the plate heat exchanger, it being generically provided that these individual plates consist of plastic.

Der gattungsgemäßen Konstruktion nach bilden zwei Einzelplatten ein Plattenpaar aus. Dabei sind die Einzelplatten voneinander beabstandet und bilden zwischen sich einen Strömungskanal für ein erstes Medium aus.According to the generic construction, two individual plates form a plate pair. The individual plates are spaced apart from one another and form a flow channel for a first medium between them.

Zwei derartige Plattenpaare bilden zusammen einen Plattenstapel, wobei die Plattenpaare beabstandet voneinander sind, womit ein Strömungskanal für das zweite Medium bereitgestellt ist.Two such plate pairs together form a plate stack, the plate pairs being spaced apart from one another, thus creating a flow channel for the second medium is provided.

Insgesamt verfügt der Plattenwärmetauscher über eine Mehrzahl von Einzelplatten, wobei Einzelplatten zu Plattenpaaren und Plattenpaare zu einem Plattenstapel zusammengefasst sind.Overall, the plate heat exchanger has a plurality of individual plates, individual plates being combined to form pairs of plates and pairs of plates to form a stack of plates.

Aus dem Stand der Technik ist es bekannt, die Einzelplatten durch Verkleben zu einem Plattenpaar bzw. Plattenpaare durch Verkleben zu einem Plattenstapel miteinander zu verbinden. Zu diesem Zweck kommt ein geeigneter Kunststoffklebstoff bzw. Kunststoffleim zum Einsatz.It is known from the prior art to connect the individual plates to one another by gluing them to form a pair of plates or to connecting the pairs of plates to one another by gluing them to form a stack of plates. A suitable plastic adhesive or plastic glue is used for this purpose.

Obgleich sich Plattenwärmetauscher der vorstehend beschriebenen Art im alltäglichen Praxiseinsatz bewährt haben, besteht Verbesserungsbedarf. So hat sich insbesondere herausgestellt, dass in der Serienfertigung gattungsgemäßer Plattenwärmetauscher große Mengen an Kunststoffklebstoff zur Verbindung der Einzelplatten bzw. der Plattenpaare zum Einsatz kommen, was mit einer entsprechenden Umweltbelastung und einer gesundheitlichen Beeinträchtigung für das Fertigungspersonal verbunden ist. Darüber hinaus ist fertigungstechnisch von Nachteil, dass der eingesetzte Klebstoff abbinden bzw. aushärten muss, was einige Zeit in Anspruch nimmt, weshalb miteinander verklebte Einzelplatten bzw. Plattenpaare zwischenzulagern sind. Es kommt deshalb zu einer Unterbrechung des Fertigungsprozesses, was zusätzliche Kosten entstehen lässt. Es ist daher aus dem Stand der Technik bekannt, Einzelplatten und/oder Plattenpaare miteinander zu verschweißen.Although plate heat exchangers of the type described above have proven themselves in everyday practical use, there is a need for improvement. In particular, it has been found that in the series production of generic plate heat exchangers, large amounts of plastic adhesive are used to connect the individual plates or the plate pairs, which is associated with a corresponding environmental impact and health impairment for the production personnel. In addition, it is disadvantageous in terms of production technology that the adhesive used has to set or harden, which takes some time, which is why individual plates or pairs of plates that are glued together have to be stored temporarily. The production process is therefore interrupted, which creates additional costs. It is therefore known from the prior art to weld individual plates and / or plate pairs to one another.

Die D1 ( WO 2008/025359 A2 ) offenbart einen Plattenwärmetauscher, der Strömungskanäle für ein erstes und ein zweites Medium bereitstellt. Der erste Strömungskanal ist hierbei zwischen zu einem Plattenpaar verbundenen Einzelplatten und der zweite Strömungskanal zwischen zu einem Plattenstapel miteinander verbundenen Plattenpaaren ausgebildet. Die Verbindung der Einzelplatten zu einem Plattenpaar und der Plattenpaare zu einem Plattenstapel findet mittels Pressschweißen statt. Verfahrensseitig werden die Einzelplatten zunächst durch Vakuumtiefziegen ausgeformt und anschließend durch Pressschweißen zu Plattenpaaren miteinander verbunden. Die Plattenpaare werden im weiteren Verfahrensverlauf kontinuierlich übereinander gestapelt und nacheinander mittels Pressschweißen miteinander verbunden.The D1 ( WO 2008/025359 A2 ) discloses a plate heat exchanger which provides flow channels for a first and a second medium. The first flow channel is formed between individual plates connected to form a plate pair and the second flow channel is formed between plate pairs connected to form a plate stack. The connection of the individual plates to a plate pair and the plate pairs to a plate stack takes place by means of pressure welding. In terms of the process, the individual plates are first formed by vacuum forming and then joined to one another by pressure welding to form pairs of plates. In the further course of the process, the pairs of plates are continuously stacked on top of each other and connected to one another by pressure welding.

Die Entgegenhaltung D2 ( WO 86/07133 A1 ) beschreibt einen Plattenwärmetauscher aus Kunststoff. Die von einem ersten und einem zweiten Medium durchströmbaren Strömungskanäle werden durch das Verschweißen von Einzelplatten gebildet, wobei die aufeinanderfolgenden Einzelplatten jeweils um 90 Grad gedreht und anschließend durch Ultraschall- oder Radiowellenschweißen miteinander verbunden werden. Es entstehen hierbei ausschließlich Strömungskanäle zwischen zwei miteinander verbundenen Einzelplatten, jedoch keine Strömungskanäle die zwischen zu einem Plattenstapel miteinander verbundenen Plattenpaaren ausgebildet sind.Document D2 ( WO 86/07133 A1 ) describes a plate heat exchanger made of plastic. The flow channels through which a first and a second medium can flow are formed by welding individual plates, with the successive individual plates being rotated 90 degrees and then connected to one another by ultrasonic or radio wave welding. In this case, only flow channels arise between two individual plates connected to one another, but no flow channels that are formed between plate pairs connected to one another to form a stack of plates.

D3 ( US 2006/0196649 A1 ) offenbart einen Plattenwärmetauscher im Cross-Flow-Betrieb, bei dem die von einem und einem zweiten Medium durchströmbaren Strömungskanäle jeweils zwischen zwei alternierenden Einzelplatten A und B ausgebildet sind. Die Einzelplatten werden hierzu alternierend miteinander thermisch verschweißt.D3 ( US 2006/0196649 A1 ) discloses a plate heat exchanger in cross-flow operation, in which the flow channels through which one and a second medium can flow are each formed between two alternating individual plates A and B. For this purpose, the individual plates are alternately thermally welded to one another.

Die D4 ( US 2001/0032714 A1 ) offenbart einen aus Kunststoff bestehenden Plattenwärmetauscher, bei dem zwei voneinander verschiedene Einzelplatten abwechselnd übereinander gestapelt und sukzessive miteinander pressverschweißt werden.The D4 ( US 2001/0032714 A1 ) discloses a plate heat exchanger made of plastic, in which two different individual plates are alternately stacked on top of one another and successively pressure-welded to one another.

Die D5 ( WO 02/090858 ) beschreibt einen Plattenwärmetauscher aus einem aus Kunststoff bestehenden Band aus zusammenhängenden Platten. Zur Ausbildung des Plattenwärmetauschers wird das Band derart gefaltet, dass die zusammenhängenden Platten abwechselnd übereinander angeordnet sind. Die Strömungswege für die beiden unterschiedlichen Medien sind durch aufeinanderfolgende Platten ausgebildet. Die Verbindung der einzelnen Plattenelemente untereinander erfolgt mittels Verkleben oder bevorzugterweise Thermoschweißen.The D5 ( WO 02/090858 ) describes a plate heat exchanger made of a plastic strip of connected plates. To form the plate heat exchanger, the band is folded in such a way that the connected plates are arranged alternately one above the other. The flow paths for the two different media are formed by successive plates. The individual plate elements are connected to one another by gluing or, preferably, thermal welding.

D6 ( DE102007009204 A1 ) offenbart ein Plattenpaar aus Kunststoff für einen Plattenwärmetauscher, bei dem tiefgezogene Plastikfolien durch Laserschweißen zu einem Plattenpaar gefügt werden.D6 ( DE102007009204 A1 ) discloses a pair of plates made of plastic for a plate heat exchanger, in which deep-drawn plastic foils are joined to a pair of plates by laser welding.

Ein weitere Entgegenhaltung D9 ( EP1097011 B1 ) offenbart lasergeschweißte Plattenpaare, die zu einem Plattenwärmtauscher gestapelt werden und dann wiederum durch Laserschweißen untereinander zu einem Plattenwärmetauscher verbunden werden. D9 schweigt zum Material der Wärmetauscherplatten.Another citation D9 ( EP1097011 B1 ) discloses laser-welded plate pairs, which are stacked to form a plate heat exchanger and then in turn connected to one another by laser welding to form a plate heat exchanger. D9 is silent about the material of the heat exchanger plates.

Durch Verschweißen der Wärmetauscherplatten wird eine schnellere Fertigung erzielt. Insbesondere Ausfallzeiten durch Zwischenlagerung zwecks Klebstoffaushärtung können vollends entfallen. Es wird darüber hinaus eine höhere Verbindungsqualität erreicht, und zwar sowohl hinsichtlich der erreichten Dichtigkeit als auch bezüglich des Wirkungsgrads. Darüber hinaus bringt die stoffschlüssige Verbindung mittels Verschweißung eine insgesamt verbesserte Festigkeit und Stabilität des gesamten Ptattenwärmetauschers. Nicht zuletzt ist ferner von Vorteil, dass auf den Einsatz von Kunststoffklebstoff bzw. -leim verzichtet werden kann, womit die Umweltbelastung einerseits und die gesundheitliche Beeinträchtigung für das Fertigungspersonal andererseits stark minimiert ist.Faster production is achieved by welding the heat exchanger plates. In particular, downtimes due to intermediate storage for the purpose of curing the adhesive can be completely eliminated. In addition, a higher connection quality is achieved, both in terms of the tightness achieved and in terms of efficiency. In addition, the integral connection by means of welding brings about an overall improved strength and stability of the entire plate heat exchanger. Last but not least, it is also advantageous that the use of plastic adhesive or glue can be dispensed with, which greatly minimizes the environmental impact on the one hand and the health impairment for the production personnel on the other.

Die Aufgabe der Erfindung besteht darin, ein Fertigungsverfahren vorzuschlagen, dass die Arbeitsgeschwindigkeit des Fertigungsprozesses erhöht und gleichzeitig eine gute Fertigungsqualität der herzustellenden Plattenwärmetauscher aus Kunststoff bietet. J Z Verfahrensseitig wird zur Lösung der vorstehend genannten Aufgabe ein Verfahren zur Herstellung eines Plattenwärmetauschers aus Kunststoff nach dem unabhängigen Anspruch 1 vorgeschlagen.The object of the invention is to propose a manufacturing method that increases the working speed of the manufacturing process and at the same time offers good manufacturing quality for the plastic plate heat exchangers to be manufactured. On the process side, a process for producing a plate heat exchanger from plastic according to independent claim 1 is proposed to achieve the above-mentioned object.

Die erfindungsgemäße Verfahrensdurchführung erlaubt einen hohen Grad der Automation. Es wird im Unterschied zum Stand der Technik eine schnellere Fertigung erzielt, und dies bei gleichzeitiger Schonung der Umwelt, da auf den Einsatz chemischer Stoffe in Form von Kunststoffklebstoff bzw. -leim verzichtet werden kann. Darüber hinaus ist eine kontinuierliche Fertigung gestattet, da auf eine Zwischenlagerung zwecks Austrockung bzw. Abbindung des Kunststoffklebstoffes verzichtet werden kann.The implementation of the method according to the invention allows a high degree of automation. In contrast to the prior art, faster production is achieved, and this while at the same time protecting the environment, since the use of chemical substances in the form of plastic glue or glue can be dispensed with. In addition, continuous production is permitted since there is no need for intermediate storage for the purpose of drying out or setting the plastic adhesive.

Die Einzelplatten und die Plattenpaare sind gemäß einem weiteren Merkmal der Erfindung entlang zweier einander gegenüberliegender Längskanten miteinander verschweißt. Es wird somit mit hoher Genauigkeit eine Randdichtigkeit für die Medien erreicht. Je nach Lage der miteinander verschweißten Längskanten entsteht ein Plattenwärmetauscher für den Gegen- bzw. Gleichstrombetrieb oder den Querstrombetrieb.According to a further feature of the invention, the individual plates and the plate pairs are welded to one another along two mutually opposite longitudinal edges. Edge tightness for the media is thus achieved with high accuracy. Depending on the position of the longitudinal edges that are welded together, a plate heat exchanger is created for counter-current, direct-current or cross-flow operation.

Der so erhaltene Plattenwärmetauscher eignet sich insbesondere als Luft-Luft-Plattenwärmetauscher. Es können selbstredend aber auch andere Medien in Kombination mit dem erfindungsgemäßen Plattenwärmetauscher zum Einsatz kommen. Da der Plattenwärmetauscher aus Kunststoff gebildet ist, eignet er sich insbesondere auch für solche Medien, die stark korrodierend wirken.The plate heat exchanger obtained in this way is particularly suitable as an air-to-air plate heat exchanger. Of course, other media can also be used in combination with the plate heat exchanger according to the invention. Since the plate heat exchanger is made of plastic, it is particularly suitable for media that are highly corrosive.

Erfindungsgemäß werden die die Einzelplatten bildenden Plattenpaare miteinander unverbunden zur Bildung eines Plattenstapels aufgestapelt.According to the invention, the pairs of plates forming the individual plates are stacked with one another without being connected to form a stack of plates.

Es erfolgt sodann in einem Arbeitsschritt eine gleichzeitige Verschweißung sämtlicher Einzelplatten, infolge dessen es zur Ausbildung der Plattenpaare einerseits und des aus den Plattenpaaren gebildeten Plattenstapel andererseits kommt. Aus fertigungstechnischen Gründen ist diese Verfahrensvariante vorteilhaft, da sie bei hoher Arbeitsgeschwindigkeit eine hohe Fertigungsqualität liefert.All the individual plates are then welded simultaneously in one work step, as a result of which the plate pairs on the one hand and the plate stack formed from the plate pairs on the other hand are formed. This process variant is advantageous for manufacturing reasons, since it delivers high manufacturing quality at a high working speed.

Zur Verfahrensdurchführung kommt eine Laserschweißmaschine zum Einsatz, die mit einer Schweißvorrichtung ausgerüstet ist, die auf die gleichzeitige Verbindung sämtlicher einen Plattenstapel ausmachenden Einzelplatten ausgelegt ist. Es ist in diesem Fall in vorteilhafter Weise möglich, die Einzelplatten des Plattenwärmetauschers innerhalb der Laserschweißmaschine aufzustapeln, die dann mittels des Lasers der Schweißvorrichtung in einem Arbeitsschritt zu einem kompakten Plattenstapel, d.h. Plattenwärmetauscher miteinander verschweißt werden. Es ist deshalb gemäß einem weiteren Merkmal des erfindungsgemäßen Verfahrens vorgesehen, die Einzelplatten vor einem Verschweißen zu stapeln. Zur Plattenstapelung dient eine entsprechende Aufnahmevorrichtung, in die die miteinander zu verschweißenden Einzelplatten nach und nach zur Bildung eines Stapels eingelegt werden. Der auf diese Weise ausgebildete Stapel entspricht in seiner Form dem späteren Wärmetauscher.To carry out the process, a laser welding machine is used that is equipped with a welding device that is designed for the simultaneous connection of all the individual plates that make up a stack of plates. In this case, it is advantageously possible to stack the individual plates of the plate heat exchanger inside the laser welding machine, which are then welded together by means of the laser of the welding device in one work step to form a compact plate stack, i.e. plate heat exchangers. It is therefore provided according to a further feature of the method according to the invention to stack the individual plates before welding. A corresponding receiving device is used for stacking the panels, into which the individual panels to be welded together are gradually inserted to form a stack. The shape of the stack formed in this way corresponds to that of the later heat exchanger.

Als Aufnahmevorrichtung, in die die Einzelplatten zur Ausbildung eines Stapels eingelegt werden, ist eine käfigartige Anordnung vorgesehen. Diese verfügt über einen Boden und mehrere zueinander parallel ausgebildete Führungen, die sich ausgehend vom Boden orthogonal zur vom Boden bereitgestellten Bodenfläche erstrecken. Dank dieser Führungen ist eine exakte Positionierung der Einzelplatten relativ zueinander gestattet. Es ist mittels der Führungen insbesondere sichergestellt, dass die miteinander zu verschweißenden Randkanten benachbarter Einzelplatten parallel zueinander verlaufend ausgerichtet sind.A cage-like arrangement is provided as the receiving device into which the individual plates are inserted to form a stack. This has a bottom and a plurality of guides formed parallel to one another, which, starting from the floor, extend orthogonally to the floor surface provided by the floor. Thanks to these guides, an exact positioning of the individual plates relative to one another is permitted. The guides ensure in particular that the edge edges of adjacent individual plates to be welded to one another are aligned running parallel to one another.

Als Schweißverfahren kommt erfindungsgemäß ein Laserschweißverfahren zur Anwendung. Dabei ist es bevorzugt, dass ein die Einzelplatten miteinander verschweißender Laserstrahl unter einem spitzen Winkel entlang zu verschweißender Plattenkanten geführt wird. Dies ermöglicht ein Verschweißen am Außenrand zweier Plattenrandkanten. Im Ergebnis ergeben sich Plattenpaare, die entlang der Außenränder zweier gegenüberliegender Längskanten miteinander laserverschweißt sind.According to the invention, a laser welding process is used as the welding process. It is preferred that a laser beam welding the individual plates to one another is guided at an acute angle along plate edges to be welded. This enables welding on the outer edge of two plate edge edges. The result is plate pairs that are laser-welded to one another along the outer edges of two opposite longitudinal edges.

Gemäß einem weiteren Merkmal der Erfindung ist vorgesehen, dass während eines Schweißvorgangs der Schweißbereich mit einem Gasstrom beaufschlagt wird. Als Gasstrom kann dabei ein Luftstrom oder ein Inertgasstrom Verwendung finden.According to a further feature of the invention, it is provided that a gas flow is applied to the welding area during a welding process. An air stream or an inert gas stream can be used as the gas stream.

Der Gasstrom trifft im jeweiligen momentan erhitzten Schweißpunkt bzw. -bereich auf die Plattenkanten, d.h. die Längskanten der Einzelplatten auf bzw. strömt an diesen vorbei. Es kann damit eine Kühlung des Schweißbereichs erreicht werden.The gas flow hits the plate edges in the currently heated welding point or area, i.e. the longitudinal edges of the individual plates or flows past them. A cooling of the welding area can thus be achieved.

Die Beaufschlagung des Schweißbereichs mit einem Gasstrom kann gemäß einer ersten Alternative mittels einer Blasdüse erfolgen. Gemäß dieser Variante kommt eine verfahrbare Blasdüse zum Einsatz, die im Verwendungsfall in Richtung auf den Schweißbereich ausgerichtet ist und diesen mit einem Gasstrom belegt. Bevorzugt wird der zum Einsatz kommende Laser gemeinsam mit der Blasdüse verfahren. Es kann dann eine gemeinsame Verfahreinrichtung für den Laser einerseits und die Blasdüse andererseits vorgesehen sein. Gemäß einer Alternative findet eine Gasstrombeaufschlagung nicht mittels einer Blasdüse, sondern mittels Erzeugung von Unterdruck statt. Gemäß dieser Alternative wird von außerhalb des zu verschweißenden Plattenstapels ein Unterdruck angelegt, infolge dessen die zwischen den Einzelplatten befindliche Luft abgesaugt wird, wodurch in der schon vorbeschriebenen Weise eine Beaufschlagung des Schweißbereichs mit einem Gasstrom erfolgt. Bevorzugter Weise kommt zur Unterdruckerzeugung eine Saugdüse zum Einsatz. Diese kann vorzugsweise mit einem Laserstrahl zum Laserverschweißen gemeinsam verfahrbar ausgebildet sein.A gas stream can be applied to the welding area according to a first alternative by means of a blower nozzle. According to this variant, a displaceable blower nozzle is used which, when used, is aligned in the direction of the welding area and covers it with a gas stream. The laser used is preferably moved together with the blower nozzle. A common movement device can then be provided for the laser on the one hand and the blow nozzle on the other hand. According to an alternative, the gas flow is not applied by means of a blower nozzle, but by means of generating negative pressure. According to this alternative, a negative pressure is applied from outside the plate stack to be welded, as a result whose air located between the individual plates is sucked off, as a result of which a gas flow is applied to the welding area in the manner already described. A suction nozzle is preferably used to generate a vacuum. This can preferably be designed to be movable together with a laser beam for laser welding.

Gemäß beider vorbeschriebener Varianten kann vorgesehen sein, eine gegenseitige Ausrichtung von Düse einerseits und Laserstrahl andererseits vorzusehen, so dass eine parallele oder eine antiparallele Ausrichtung relativ zueinander stattfindet.According to both variants described above, provision can be made for a mutual alignment of the nozzle on the one hand and the laser beam on the other hand, so that a parallel or an anti-parallel alignment takes place relative to one another.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung anhand der einzigen Figur 1, die in schematischer Darstellung einen Plattenwärmetauscher zeigt.Further features and advantages of the invention emerge from the following description with reference to the only one Figure 1 , which shows a schematic representation of a plate heat exchanger.

Fig. 1 lässt in rein schematischer Darstellung einen Plattenwärmetauscher W erkennen, der nach dem erfindungsgemäßen Verfahren gefertigt werden kann. Fig. 1 shows in a purely schematic representation a plate heat exchanger W which can be manufactured according to the method according to the invention.

Dieser verfügt über eine Mehrzahl von Einzelplatten E aus Kunststoff, die zwischen sich jeweils einen Strömungskanal SK ausbilden, wobei Strömungskanäle SK sowohl für ein erstes Medium I als auch für ein zweites Medium II vorgesehen sind. Im gezeigten Beispiel ist der Plattenwärmetauscher W als Gegenstromwärmetauscher ausgebildet.This has a plurality of individual plates E made of plastic, which each form a flow channel SK between them, flow channels SK being provided both for a first medium I and for a second medium II. In the example shown, the plate heat exchanger W is designed as a countercurrent heat exchanger.

Wie Fig. 1 erkennen lässt, bilden jeweils zwei Einzelplatten ein Plattenpaar P aus, wobei der von einem Plattenpaar bereitgestellte Strömungskanal SK zur Hindurchströmung des ersten Mediums I dient.How Fig. 1 As can be seen, two individual plates each form a pair of plates P, the flow channel SK provided by a pair of plates serving for the first medium I to flow through.

Die Plattenpaare P bilden zusammen einen Plattenstapel S aus. Dabei dient der zwischen zwei Plattenpaaren P jeweils ausgebildete Strömungskanal SK der Hindurchführung des zweiten Mediums II.The plate pairs P together form a plate stack S. The flow channel SK, which is formed between two pairs of plates P, serves to guide the second medium II through.

Die Durchflussrichtungen von erstem Medium I und zweitem Medium II sind in der Fig. 1 beispielhaft durch Pfeile kenntlich gemacht.The flow directions of the first medium I and the second medium II are in Fig. 1 exemplified by arrows.

Es ist erfindungsgemäß vorgesehen, dass die ein Plattenpaar P bildenden Einzelplatten E einerseits sowie die einen Plattenstapel S bildenden Plattenpaare P andererseits mittels Laserschweißen miteinander verbunden sind. Dabei ist vorgesehen, die Einzelplatten E des Plattenwärmetauschers W in einem Arbeitsschritt miteinander zu verschweißen, zu welchem Zweck eine Schweißmaschine zum Einsatz kommt, in der sämtliche Einzelplatten E des Plattenwärmetauschers W aufgestapelt und anschließend unter Ausbildung der einzelnen Strömungskanäle SK miteinander laserverschweißt werden.It is provided according to the invention that the individual plates E forming a plate pair P on the one hand and the plate pairs P forming a plate stack S on the other hand are connected to one another by means of laser welding. It is provided that the individual plates E of the plate heat exchanger W to be welded together in one work step, for which purpose a welding machine is used in which all the individual plates E of the plate heat exchanger W are stacked and then laser-welded to one another to form the individual flow channels SK.

BezugszeichenlisteList of reference symbols

WW.
PlattenwärmetauscherPlate heat exchanger
EE.
EinzelplatteSingle plate
PP
PlattenpaarPlate pair
SKSK
StrömungskanalFlow channel
SS.
PlattenstapelStack of plates
II.
erstes Mediumfirst medium
IIII
zweites Mediumsecond medium

Claims (6)

  1. Process for manufacturing a plate heat exchanger (W), in particular an air-air plate heat exchanger, made of plastic, in which individual plates (E) made of plastic are connected to each other to form a plate pair (P), forming a flow duct (SK) for a first medium (I), and plate pairs (P) are connected to one another to form a plate stack (S), forming a flow duct (SK) for a second medium (II), wherein the connection of the individual plates (E) forming a plate pair (P) and the plate pairs (P) forming a plate stack (S) is carried out by means of laser welding, wherein the individual plates (E) and the plate pairs (P) are laser- welded to one another along two longitudinal edges opposing each other, wherein all the individual plates (E) are laser-welded to one another simultaneously, to form both plate pairs (P) and also a plate stack (S), wherein the individual plates (E) of the plate heat exchanger (W) are stacked up within a laser welding machine comprising a holding device in the form of a cage-like arrangement and comprising a welding device, and are welded to one another simultaneously in one operation by means of a laser of the welding device to form a plate heat exchanger.
  2. Process according to Claim 1, characterized in that a laser beam welding the individual plates (E) to one another is guided at an acute angle along plate edges to be welded.
  3. Process according to one of the preceding Claims 1 or 2, characterized in that a gas stream is applied to the welding region during a welding operation.
  4. Process according to Claim 3, characterized in that the gas stream is blown in.
  5. Process according to Claim 3, characterized in that the gas stream is generated by applying a negative pressure.
  6. Process according to Claim 3, 4 or 5, characterized in that the gas stream used is an air stream or an inert gas stream.
EP12191858.5A 2012-11-08 2012-11-08 Manufacturing Process for a Plate Heat Exchanger Made of Plastic Active EP2730880B1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
SI201231918T SI2730880T1 (en) 2012-11-08 2012-11-08 Manufacturing Process for a Plate Heat Exchanger Made of Plastic
ES12191858T ES2865176T3 (en) 2012-11-08 2012-11-08 Procedure for manufacturing a plastic plate heat exchanger
DK12191858.5T DK2730880T3 (en) 2012-11-08 2012-11-08 Method for manufacturing a plastic plate heat exchanger
PL12191858T PL2730880T3 (en) 2012-11-08 2012-11-08 Manufacturing Process for a Plate Heat Exchanger Made of Plastic
EP12191858.5A EP2730880B1 (en) 2012-11-08 2012-11-08 Manufacturing Process for a Plate Heat Exchanger Made of Plastic
HUE12191858A HUE054160T2 (en) 2012-11-08 2012-11-08 Manufacturing process for a plate heat exchanger made of plastic
LTEP12191858.5T LT2730880T (en) 2012-11-08 2012-11-08 Manufacturing Process for a Plate Heat Exchanger Made of Plastic
CN201380068662.6A CN105008849A (en) 2012-11-08 2013-11-08 Plate heat exchanger made of plastic and method for the production thereof
EA201590784A EA037914B9 (en) 2012-11-08 2013-11-08 Plate heat exchanger made of plastic and method for the production thereof
PCT/IB2013/002500 WO2014072804A1 (en) 2012-11-08 2013-11-08 Plate heat exchanger made of plastic and method for the production thereof
HRP20210789TT HRP20210789T1 (en) 2012-11-08 2021-05-17 Manufacturing process for a plate heat exchanger made of plastic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12191858.5A EP2730880B1 (en) 2012-11-08 2012-11-08 Manufacturing Process for a Plate Heat Exchanger Made of Plastic

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EP2730880A1 EP2730880A1 (en) 2014-05-14
EP2730880B1 true EP2730880B1 (en) 2021-02-24

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CN (1) CN105008849A (en)
DK (1) DK2730880T3 (en)
EA (1) EA037914B9 (en)
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HR (1) HRP20210789T1 (en)
HU (1) HUE054160T2 (en)
LT (1) LT2730880T (en)
PL (1) PL2730880T3 (en)
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CN113199144B (en) * 2021-05-20 2024-02-09 湖北航嘉麦格纳座椅系统有限公司 Laser welding method and device for workpiece and storage medium

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EP1097011B1 (en) * 1998-06-24 2003-09-10 Alfa Laval Ab A method of joining at least four heat transfer plates to a plate package, and a plate package

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DK1624271T3 (en) * 2003-06-05 2010-06-07 Panasonic Ecology Systems Co Ltd heat exchanger
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CN105008849A (en) 2015-10-28
HUE054160T2 (en) 2021-08-30
WO2014072804A1 (en) 2014-05-15
PL2730880T3 (en) 2021-07-26
EA037914B9 (en) 2022-02-18
LT2730880T (en) 2021-05-25
SI2730880T1 (en) 2021-08-31
EP2730880A1 (en) 2014-05-14
EA037914B1 (en) 2021-06-04
EA201590784A1 (en) 2015-10-30
DK2730880T3 (en) 2021-05-17
HRP20210789T1 (en) 2021-06-25
ES2865176T3 (en) 2021-10-15

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