EP2895747B1 - Wall ring for a fan with heating element - Google Patents

Wall ring for a fan with heating element Download PDF

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Publication number
EP2895747B1
EP2895747B1 EP13753614.0A EP13753614A EP2895747B1 EP 2895747 B1 EP2895747 B1 EP 2895747B1 EP 13753614 A EP13753614 A EP 13753614A EP 2895747 B1 EP2895747 B1 EP 2895747B1
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EP
European Patent Office
Prior art keywords
wall ring
heating element
fan
heating
ring
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EP13753614.0A
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German (de)
French (fr)
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EP2895747A1 (en
Inventor
Thomas Heli
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Ebm Papst Mulfingen GmbH and Co KG
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Ebm Papst Mulfingen GmbH and Co KG
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Priority to PL13753614T priority Critical patent/PL2895747T3/en
Publication of EP2895747A1 publication Critical patent/EP2895747A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5853—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps heat insulation or conduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526—Details of the casing section radially opposing blade tips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/90—Coating; Surface treatment

Definitions

  • the invention is directed both to a wall ring for a fan, comprising at least one heating element for heating the wall ring and a fan, comprising a fan and a heated wall ring, wherein the wall ring surrounds the fan of the fan.
  • Fans in particular axial fans, are used inter alia in applications with very low temperatures, for example for heat pumps or for evaporators in cold rooms.
  • Such fans usually include a fan and a wall ring surrounding the fan.
  • an electrical resistance heater is placed around the wall ring of the fan from the outside and heated the wall ring. It is disadvantageous that a large amount of energy must be introduced in order to sufficiently warm the wall ring and to melt the ice on the inside of the wall ring. This is particularly problematic if the wall ring consists of materials that are only slightly thermally conductive.
  • the electrical resistance heaters usually use a mains voltage of 230V, which may be a security problem under certain circumstances.
  • the invention is therefore an object of the invention to provide a wall ring for a fan available, which particularly energy-efficient and safe prevents icing of the wall ring and thus freezing of the fan.
  • the object is achieved by a wall ring for a heater with the features of claim 1.
  • the heating element comprises an electrically conductive heating layer, which is arranged on the fan wheel facing the inside of the wall ring.
  • the heating element has, at its axially extending side edges, contacting by means of contact elements, so that the direction of an electrical current flowing through the heating element points in the circumferential direction of the wall ring.
  • the heating element By arranging the heating element on the inside of the wall ring between the inside of the wall ring and the ends of the fan blades of the fan wheel, the heating element is arranged where the ice predominantly forms. Since the heating element is disposed on the fan wheel facing surface of the wall ring, it prevents by the direct heating of the heating element, the formation of ice in the portion of the wall ring, which is covered by the heating element. In addition, the heating element heats its environment by heat conduction and heat radiation. The heat conduction and thermal radiation additionally act on the areas of the inner side of the wall ring which are not covered by the heating element and, in particular, quickly heat the surface of the inner side of the wall ring adjoining the heating element.
  • the electrically conductive heating layer of the heating element is designed as an electrically conductive lacquer, in particular as a CNT lacquer with Kohlenstoffnanomaterialien.
  • the heating element can be applied particularly simply by means of a painting process during the production of the wall ring, in particular also to complex surface structures.
  • the heating element can be applied very thin, so that the air flow within the wall ring and the movement of the wings is not affected or negligible.
  • the lacquer layer according to the invention allows a particularly uniform and planar heating of the wall ring.
  • such a heating element is particularly energy efficient, so that a reduction of the required heat energy, in particular up to between 0.5 W and 12 W, is possible.
  • the heating element covers only a portion extending in the circumferential direction of the inner side of the wall ring and / or extends only over a portion extending in the axial direction of the inside of the wall ring. This allows on the one hand to save material costs by only the critical for the protection against icing portions of the wall ring are covered by the heating element, and on the other hand, the energy requirements of certain sizes of the wall ring and / or operating parameters of the fan, for which the wall ring is determined to adjust.
  • the heating element has at its circumferentially extending side edges also contacting by means of contact elements, so that the direction of a current flowing through the heating element in the axial direction of the wall ring has.
  • a plurality of heating elements are arranged distributed on the inside of the wall ring facing the fan wheel and their contact elements connected in parallel or in series. This allows a particularly flexible and energy-optimized positioning of the heating elements for a specific use of the fan with the lowest possible cost of materials for the heating elements.
  • a wall ring 1 is shown for a fan.
  • the wall ring 1 has in particular a cylindrical basic shape and has a fan 5 facing the inside 2 on.
  • a heating element 3 is arranged for heating the wall ring 1.
  • the heating element 3 comprises an electrically conductive heating layer.
  • the heating element 3 does not cover the entire surface of the inner side 2, but only a portion of the inner side 2 of the wall ring 1.
  • the heating element 3 covers a circumferentially extending portion of the inner side 2 and / or extending in the axial direction portion the inside 2 off.
  • it is also possible that the entire area of the inner side 2 is covered in the circumferential direction and / or the axial direction.
  • the electrically conductive heating layer of the heating element 3 is formed in a preferred embodiment as an electrically conductive paint.
  • the varnish is manufactured in particular as CNT varnish and comprises carbon nanomaterials.
  • the electrically conductive heating layer of the heating element 3 is designed as an electrically conductive adhesive tape.
  • the adhesive tape comprises in particular a CNT lacquer layer with carbon nanomaterials.
  • the size and the positioning of the heating element 3 may be different depending on the application parameters, for cost reasons, the heating element 3 covers a small area as possible and is formed as a thin layer as possible.
  • the heating power must provide sufficient protection against icing.
  • the heating element 3 covers approximately one third of the circumference of the inner side 2 of the wall ring 1. It is the heating element 3 is positioned so that it is located where the icing would predominantly occur in the operating state of the fan 6.
  • the heating element 3 at its circumferentially extending side edges on a contact by means of contact elements 4a, so that the direction of a current flowing through the heating element 3 in the axial direction of the wall ring 1 has.
  • 4 and 7 has the heating element 3 at its axially extending side edges contacting by means of contact elements 4, so that the direction of a current flowing through the heating element 3 in the circumferential direction of the wall ring 1 has.
  • a plurality of heating elements 3 are arranged distributed on the inner side 2 of the wall ring 1 and the contact elements 4, 4a are connected in parallel or in series.
  • the heating element 3 is designed for a low voltage between 3 V and 60 V, in particular for 12 V or 24 V.
  • the heating element 3 By the wiring of the heating element 3 with an operating voltage current flows through the heating element 3, which is heated thereby, whereby ice formation in the region of the heating element 3 is avoided. In addition, heat is released from the heating element 3 by heat conduction and thermal radiation into the environment of the heating element 3, in particular to the surface of the inner side 2 of the wall ring 1.
  • the heating element 3 is so on the inside 2 of the wall ring. 1 positioned so that the heating element 3 in the operating state of the fan 6 covers the region of the inner side 2, on which the icing would occur predominantly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Resistance Heating (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung richtet sich sowohl auf einen Wandring für einen Lüfter, umfassend mindestens ein Heizelement zum Beheizen des Wandrings als auch auf einen Lüfter, umfassend ein Lüfterrad und einen beheizten Wandring, wobei der Wandring das Lüfterrad des Lüfters umschließt.The invention is directed both to a wall ring for a fan, comprising at least one heating element for heating the wall ring and a fan, comprising a fan and a heated wall ring, wherein the wall ring surrounds the fan of the fan.

Lüfter, insbesondere Axiallüfter, werden unter anderem bei Anwendungen mit sehr tiefen Temperaturen, wie zum Beispiel für Wärmepumpen oder für Verdampfer in Kühlräumen, eingesetzt. Derartige Lüfter umfassen in der Regel ein Lüfterrad und einen Wandring, der das Lüfterrad umgibt. Dabei besteht die Gefahr von Eisbildung am Wandring und somit einem Festfrieren der Flügel des Lüfterrades an dem Wandring. Um das Festfrieren zu verhindern, wird in bekannten Lüftern typischerweise eine elektrische Widerstandsheizung um den Wandring des Lüfters von außen gelegt und der Wandring beheizt. Dabei ist es nachteilig, dass eine große Energiemenge eingebracht werden muss, um den Wandring ausreichend durchzuwärmen und um das Eis auf der Innenseite des Wandrings zu schmelzen. Dies ist besonders problematisch, wenn der Wandring aus Materialien besteht, die nur gering wärmeleitfähig sind. Zudem wird dabei ein hoher Anteil der Wärmeenergie an die Umgebung abgegeben, was insbesondere bei Kühlräumen besonders unerwünscht ist, da diese zusätzliche Wärmeenergie dann nachträglich dem Kühlraum entzogen werden muss. Außerdem wird bei den elektrischen Widerstandsheizungen in der Regel eine Netzspannung von 230V verwendet, was unter Umständen ein Sicherheitsproblem darstellen kann.Fans, in particular axial fans, are used inter alia in applications with very low temperatures, for example for heat pumps or for evaporators in cold rooms. Such fans usually include a fan and a wall ring surrounding the fan. There is a risk of ice formation on the wall ring and thus a freezing of the blades of the fan wheel on the wall ring. In order to prevent the freezing, in known fans typically an electrical resistance heater is placed around the wall ring of the fan from the outside and heated the wall ring. It is disadvantageous that a large amount of energy must be introduced in order to sufficiently warm the wall ring and to melt the ice on the inside of the wall ring. This is particularly problematic if the wall ring consists of materials that are only slightly thermally conductive. In addition, while a high proportion of the heat energy is released to the environment, which is particularly undesirable in particular cold rooms, as this additional heat energy must be subsequently withdrawn from the refrigerator. In addition, the electrical resistance heaters usually use a mains voltage of 230V, which may be a security problem under certain circumstances.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Wandring für einen Lüfter zur Verfügung zu stellen, der besonders energieeffizient und sicher eine Vereisung des Wandrings und damit ein Festfrieren des Lüfters verhindert. Erfindungsgemäß wird die Aufgabe durch einen Wandring für einen Heizlüfter mit den Merkmalen des Anspruchs 1 gelöst.The invention is therefore an object of the invention to provide a wall ring for a fan available, which particularly energy-efficient and safe prevents icing of the wall ring and thus freezing of the fan. According to the invention the object is achieved by a wall ring for a heater with the features of claim 1.

Bei einem Wandring der eingangs beschriebenen Art wird die Aufgabe erfindungsgemäß dadurch gelöst, dass das Heizelement eine elektrisch leitende Heizschicht umfasst, die an der dem Lüfterrad zugewandten Innenseite des Wandrings angeordnet ist. Das Heizelement weist an seinen in axialer Richtung verlaufenden Seitenrändern eine Kontaktierung mittels Kontaktelementen auf, so dass die Richtung eines durch das Heizelement fließenden elektrischen Stroms in Umfangsrichtung des Wandrings weist.In a wall ring of the type described above, the object is achieved in that the heating element comprises an electrically conductive heating layer, which is arranged on the fan wheel facing the inside of the wall ring. The heating element has, at its axially extending side edges, contacting by means of contact elements, so that the direction of an electrical current flowing through the heating element points in the circumferential direction of the wall ring.

Durch die Anordnung des Heizelements auf der Innenseite des Wandrings zwischen der Innenseite des Wandrings und den Enden der Lüfterflügel des Lüfterrades ist das Heizelement dort angeordnet, wo sich das Eis überwiegend bildet. Da das Heizelement auf der dem Lüfterrad zugekehrten Oberfläche des Wandringes angeordnet ist, verhindert es durch die direkte Erwärmung des Heizelements die Entstehung von Eis in dem Teilbereich des Wand rings, der von dem Heizelement abgedeckt ist. Zudem erwärmt das Heizelement seine Umgebung durch Wärmeleitung und Wärmestrahlung. Die Wärmeleitung und Wärmestrahlung wirken zusätzlich auf die nicht durch das Heizelement abgedeckten Bereiche der Innenseite des Wandrings und beheizen insbesondere die an das Heizelement angrenzende Oberfläche der Innenseite des Wandrings schnell. Somit wird die Bildung von Eis auf der Innenseite des Wandrings im relevanten Oberflächenbereich verhindert, ohne dass der Wandring vollständig mit dem Heizelement bedeckt werden muss. Zudem werden die Luft in einem Spalt zwischen Wandring und Lüfterflügeln und die Enden der Lüfterflügel durch die Wärmestrahlung des Heizelementes erwärmt. Dies verhindert zusätzlich die Eisbildung an den Enden der LüfterflügeLBy arranging the heating element on the inside of the wall ring between the inside of the wall ring and the ends of the fan blades of the fan wheel, the heating element is arranged where the ice predominantly forms. Since the heating element is disposed on the fan wheel facing surface of the wall ring, it prevents by the direct heating of the heating element, the formation of ice in the portion of the wall ring, which is covered by the heating element. In addition, the heating element heats its environment by heat conduction and heat radiation. The heat conduction and thermal radiation additionally act on the areas of the inner side of the wall ring which are not covered by the heating element and, in particular, quickly heat the surface of the inner side of the wall ring adjoining the heating element. Thus, the formation of ice on the inside of the wall ring in the relevant surface area is prevented, without the wall ring must be completely covered with the heating element. In addition, the air in a gap between the wall ring and fan blades and the ends of the fan blades are heated by the heat radiation of the heating element. This also prevents ice formation at the ends of the fan blades

In einer Ausführungsform der Erfindung ist die elektrisch leitende Heizschicht des Heizelements als ein elektrisch leitender Lack, insbesondere als CNT-Lack mit Kohlenstoffnanomaterialien, ausgebildet. Dadurch kann das Heizelement besonders einfach durch einen Lackierprozess während der Fertigung des Wandrings, insbesondere auch auf komplexe Oberflächenstrukturen aufgetragen werden. Zudem kann das Heizelement besonders dünn aufgetragen werden, so dass der Luftstrom innerhalb des Wandrings und die Bewegung der Flügel nicht oder vernachlässigbar gering beeinflusst wird. Die erfindungsgemäße Lackschicht ermöglicht eine besonders gleichmäßige und flächige Erwärmung des Wandrings. Des Weiteren ist ein derartiges Heizelement besonders energieeffizient, so dass eine Reduzierung der benötigten Wärmeenergie, insbesondere bis auf zwischen 0,5 W und 12 W, möglich ist.In one embodiment of the invention, the electrically conductive heating layer of the heating element is designed as an electrically conductive lacquer, in particular as a CNT lacquer with Kohlenstoffnanomaterialien. As a result, the heating element can be applied particularly simply by means of a painting process during the production of the wall ring, in particular also to complex surface structures. In addition, the heating element can be applied very thin, so that the air flow within the wall ring and the movement of the wings is not affected or negligible. The lacquer layer according to the invention allows a particularly uniform and planar heating of the wall ring. Furthermore, such a heating element is particularly energy efficient, so that a reduction of the required heat energy, in particular up to between 0.5 W and 12 W, is possible.

Zur weiteren Ausgestaltung der Erfindung deckt das Heizelement nur einen in Umfangsrichtung verlaufenden Teilbereich der Innenseite des Wandrings ab und/oder verläuft nur über einen in axialer Richtung verlaufenden Teilbereich der Innenseite des Wandrings. Dies ermöglicht einerseits Materialkosten zu sparen, indem nur die für den Schutz vor Vereisung kritischen Teilbereiche des Wandrings vom Heizelement abgedeckt werden, und andererseits den Energiebedarf an bestimmte Größen des Wandrings und/oder Betriebsparameter des Lüfters, für den der Wandring bestimmt ist, anzupassen.For further embodiment of the invention, the heating element covers only a portion extending in the circumferential direction of the inner side of the wall ring and / or extends only over a portion extending in the axial direction of the inside of the wall ring. This allows on the one hand to save material costs by only the critical for the protection against icing portions of the wall ring are covered by the heating element, and on the other hand, the energy requirements of certain sizes of the wall ring and / or operating parameters of the fan, for which the wall ring is determined to adjust.

Das Heizelement weist an seinen in Umfangsrichtung verlaufenden Seitenrändern auch eine Kontaktierung mittels Kontaktelementen auf, so dass die Richtung eines durch das Heizelement fließenden Stroms in axialer Richtung des Wandrings weist.The heating element has at its circumferentially extending side edges also contacting by means of contact elements, so that the direction of a current flowing through the heating element in the axial direction of the wall ring has.

Insbesondere sind in einer Ausgestaltung der Erfindung mehrere Heizelemente auf der dem Lüfterrad zugewandten Innenseite des Wandrings verteilt angeordnet und deren Kontaktelemente parallel oder seriell geschaltet. Dies ermöglicht eine besonders flexible und energieoptimierte Positionierung der Heizelemente für eine bestimmte Verwendung des Lüfters bei möglichst niedrigem Materialaufwand für die Heizelemente.In particular, in one embodiment of the invention a plurality of heating elements are arranged distributed on the inside of the wall ring facing the fan wheel and their contact elements connected in parallel or in series. This allows a particularly flexible and energy-optimized positioning of the heating elements for a specific use of the fan with the lowest possible cost of materials for the heating elements.

In einer Ausführungsform der Erfindung ist das Heizelement für eine Kleinspannung zwischen 3 V und 60 V, insbesondere für 12 V oder 24 V, ausgelegt. Dies hat den Vorteil, dass die Gefahr durch Funkenbildung oder Stromschläge bei einer höheren Netzspannung vermieden wird.In one embodiment of the invention, the heating element for a low voltage between 3 V and 60 V, in particular for 12 V or 24 V, designed. This has the advantage that the risk of sparking or electric shock at a higher mains voltage is avoided.

Weitere Einzelheiten, Merkmale und vorteilhafte Weiterbildungen der Erfindung ergeben sich aus dem im Folgenden beschriebenen und in den Zeichnungen 3, 4 und 7 dargestellten Ausführungsbeispielen sowie aus den Unteransprüchen. Die im weiteren Verlauf ebenfalls beschriebenen und in den Zeichnungen 1,2,5 und 6 dargestellten Beispiele stellen nicht-beanspruchte Ausführungen dar. Es zeigt:

  • Fig. 1 eine skizzenhafte Darstellung eines Ventilators mit einem Wandring,
  • Fig. 2 bis 7 verschiedene Wandringe in alternativen Ausführungen.
Further details, features and advantageous developments of the invention will become apparent from the embodiments described below and shown in the drawings 3, 4 and 7 and from the dependent claims. The examples also described below and illustrated in the drawings 1, 2, 5 and 6 represent non-claimed embodiments. It shows:
  • Fig. 1 a sketchy representation of a fan with a wall ring,
  • Fig. 2 to 7 different wall rings in alternative versions.

In den verschiedenen Figuren der Zeichnung sind gleiche Teile stets mit den gleichen Bezugszeichen versehen.In the various figures of the drawing, like parts are always provided with the same reference numerals.

In Fig. 1 ist ein Wandring 1 für einen Lüfter dargestellt. Im montierten Zustand des Wandrings 1 befindet sich wie dargestellt innerhalb des Wandrings 1 ein Lüfterrad 5 des Lüfters 6. Der Wandring 1 hat insbesondere eine zylindrische Grundform und weist eine dem Lüfterrad 5 zugewandte Innenseite 2 auf. An der dem Lüfterrad 5 zugewandten Innenseite 2 des Wandrings 1 ist ein Heizelement 3 zum Beheizen des Wandrings 1 angeordnet. Das Heizelement 3 umfasst eine elektrisch leitende Heizschicht. In der dargestellten Ausführungsform deckt das Heizelement 3 nicht die gesamte Oberfläche der Innenseite 2 ab, sondern nur einen Teilbereich der Innenseite 2 des Wandrings 1. Dabei deckt das Heizelement 3 einen in Umfangsrichtung verlaufenden Teilbereich der Innenseite 2 und/oder einen in axialer Richtung verlaufenden Teilbereich der Innenseite 2 ab. Alternativ ist es auch möglich, dass in Umfangsrichtung und/oder axialer Richtung der ganze Bereich der Innenseite 2 abgedeckt wird.In Fig. 1 a wall ring 1 is shown for a fan. In the assembled state of the wall ring 1 is located as shown within the wall ring 1, a fan 5 of the fan 6. The wall ring 1 has in particular a cylindrical basic shape and has a fan 5 facing the inside 2 on. On the fan wheel 5 facing inside 2 of the wall ring 1, a heating element 3 is arranged for heating the wall ring 1. The heating element 3 comprises an electrically conductive heating layer. In the illustrated embodiment, the heating element 3 does not cover the entire surface of the inner side 2, but only a portion of the inner side 2 of the wall ring 1. In this case, the heating element 3 covers a circumferentially extending portion of the inner side 2 and / or extending in the axial direction portion the inside 2 off. Alternatively, it is also possible that the entire area of the inner side 2 is covered in the circumferential direction and / or the axial direction.

Die elektrisch leitende Heizschicht des Heizelements 3 ist in einem vorzugsweisen Ausführungsbeispiel als ein elektrisch leitender Lack ausgebildet. Der Lack ist insbesondere als CNT-Lack hergestellt und umfasst Kohlenstoffnanomaterialien. Alternativ ist die elektrisch leitende Heizschicht des Heizelements 3 als ein elektrisch leitendes Klebeband ausgebildet. In diesem Fall umfasst das Klebeband insbesondere eine CNT-Lackschicht mit Kohlenstoffnanomaterialien.The electrically conductive heating layer of the heating element 3 is formed in a preferred embodiment as an electrically conductive paint. The varnish is manufactured in particular as CNT varnish and comprises carbon nanomaterials. Alternatively, the electrically conductive heating layer of the heating element 3 is designed as an electrically conductive adhesive tape. In this case, the adhesive tape comprises in particular a CNT lacquer layer with carbon nanomaterials.

Grundsätzlich kann die Größe und die Positionierung des Heizelementes 3 je nach Anwendungsparametern verschieden sein, wobei aus Kostengründen das Heizelement 3 eine möglichst kleine Fläche abdeckt und als eine möglichst dünne Schicht ausgebildet ist. Dabei muss die Heizleistung ausreichend Schutz vor Vereisung ermöglichen. Im gezeigten Ausführungsbespiel deckt das Heizelement 3 ungefähr ein Drittel des Umfangs der Innenseite 2 des Wandrings 1 ab. Dabei ist das Heizelement 3 derart positioniert, dass es sich dort befindet, wo im Betriebszustand des Lüfters 6 die Vereisung überwiegend auftreten würde.Basically, the size and the positioning of the heating element 3 may be different depending on the application parameters, for cost reasons, the heating element 3 covers a small area as possible and is formed as a thin layer as possible. The heating power must provide sufficient protection against icing. In the exemplary embodiment shown, the heating element 3 covers approximately one third of the circumference of the inner side 2 of the wall ring 1. It is the heating element 3 is positioned so that it is located where the icing would predominantly occur in the operating state of the fan 6.

Bei den nicht-beanspruchten Ausführungsformen in Fig. 1, 2, 5 und 6 weist das Heizelement 3 an seinen in Umfangsrichtung verlaufenden Seitenrändern eine Kontaktierung mittels Kontaktelementen 4a auf, so dass die Richtung eines durch das Heizelement 3 fließenden Stroms in axialer Richtung des Wandrings 1 weist.In the non-claimed embodiments in Fig. 1, 2 . 5 and 6 the heating element 3 at its circumferentially extending side edges on a contact by means of contact elements 4a, so that the direction of a current flowing through the heating element 3 in the axial direction of the wall ring 1 has.

Bei den erfindungsgemäßen Ausführungsformen in Fig. 3, 4 und 7 weist das Heizelement 3 an seinen in axialer Richtung verlaufenden Seitenrändern eine Kontaktierung mittels Kontaktelementen 4 auf, so dass die Richtung eines durch das Heizelement 3 fließenden Stroms in Umfangsrichtung des Wandrings 1 weist.In the embodiments according to the invention in Fig. 3, 4 and 7 has the heating element 3 at its axially extending side edges contacting by means of contact elements 4, so that the direction of a current flowing through the heating element 3 in the circumferential direction of the wall ring 1 has.

Wie in den Fig. 4, 5, 6 und 7 dargestellt, ist es auch möglich, dass mehrere Heizelemente 3 auf der Innenseite 2 des Wandrings 1 verteilt angeordnet sind und dessen Kontaktelemente 4, 4a parallel oder seriell geschaltet sind. Alternativ kann das Heizelement 3 in Umfangsrichtung den, bis auf einen axial verlaufenden Isolierungsspalt, gesamten Umfang der Innenseite 2 des Wandrings 1 abdecken. Durch eine Verteilung von Heizelementen 3 über den Umfang des Wandrings 1 wird der Schutz vor Vereisung unabhängig von der Einbauposition des Lüfters 6 ermöglicht.As in the Fig. 4 . 5 . 6 and 7 illustrated, it is also possible that a plurality of heating elements 3 are arranged distributed on the inner side 2 of the wall ring 1 and the contact elements 4, 4a are connected in parallel or in series. Alternatively, the heating element 3 in the circumferential direction, except for an axially extending insulation gap, cover the entire circumference of the inner side 2 of the wall ring 1. By a distribution of heating elements 3 over the circumference of the wall ring 1, the protection against icing is made possible regardless of the installation position of the fan 6.

Das Heizelement 3 ist für eine Kleinspannung zwischen 3 V und 60 V, insbesondere für 12 V oder 24 V, ausgelegt.The heating element 3 is designed for a low voltage between 3 V and 60 V, in particular for 12 V or 24 V.

Durch die Beschaltung des Heizelementes 3 mit einer Betriebsspannung fließt Strom durch das Heizelement 3, welches sich dadurch erhitzt, wodurch eine Eisbildung in dem Bereich des Heizelementes 3 vermieden wird. Zudem wird Wärme von dem Heizelement 3 durch Wärmeleitung und Wärmestrahlung in die Umgebung des Heizelementes 3, insbesondere an die Oberfläche der Innenseite 2 des Wandrings 1 abgegeben. Das Heizelement 3 wird derart an der Innenseite 2 des Wandrings 1 positioniert, dass das Heizelement 3 im Betriebszustand des Lüfters 6 den Bereich der Innenseite 2 abdeckt, an dem die Vereisung überwiegend auftreten würde.By the wiring of the heating element 3 with an operating voltage current flows through the heating element 3, which is heated thereby, whereby ice formation in the region of the heating element 3 is avoided. In addition, heat is released from the heating element 3 by heat conduction and thermal radiation into the environment of the heating element 3, in particular to the surface of the inner side 2 of the wall ring 1. The heating element 3 is so on the inside 2 of the wall ring. 1 positioned so that the heating element 3 in the operating state of the fan 6 covers the region of the inner side 2, on which the icing would occur predominantly.

Claims (7)

  1. A wall ring (1) for a fan (6) having a fan wheel (5) comprising at least one heating element (3) for heating the wall ring (1), whereby the heating element (3) comprises an electrically conductive heating layer that is arranged on the inside (2) of the wall ring (1) facing the fan wheel (5), characterized in that the electrically conductive heating layer of the heating element (3) is configured as an electrically conductive CNT coating with carbon nano-materials, whereby the heating element (3) makes contact by means of contact elements (4) on its side edges that run in the axial direction, so that the direction of a current flowing through the heating element (3) faces in the circumferential direction of the wall ring (1).
  2. The wall ring 1 according to claim 1, characterized in that the heating element (3) covers a partial area that is on the inside (2) of the wall ring (1) and that runs in the circumferential direction.
  3. The wall ring (1) according to claim 1 or 2, characterized in that the heating element (3) covers a partial area of the inside (2) of the wall ring (1) that runs in the axial direction.
  4. The wall ring (1) according to claim 1, characterized in that several heating elements are arranged so as to be distributed on the inside (2) of the wall ring (1) facing the fan wheel (5) and its contact elements (4, 4a) are connected in parallel or in series.
  5. The wall ring (1) according to one of claims 1 to 3, characterized in that the heating element (3) covers the entire circumference of the inside (2) of the wall ring (1) in the circumferential direction, except for insulation gap that runs axially.
  6. The wall ring (1) according to one of claims 1 to 5, characterized in that the heating element (3) is configured for a low voltage between 3 V and 60 V, especially for 12 V to 24 V.
  7. A fan (6) comprising a fan wheel (5) and a heated wall ring (1), whereby the wall ring (1) encloses the fan wheel (5) of the fan, characterized by a wall ring (1) having the features according to one of claims 1 to 6.
EP13753614.0A 2012-09-11 2013-08-22 Wall ring for a fan with heating element Active EP2895747B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13753614T PL2895747T3 (en) 2012-09-11 2013-08-22 Wall ring for a fan with heating element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012108449.1A DE102012108449A1 (en) 2012-09-11 2012-09-11 Wall ring of a fan with heating element
PCT/EP2013/067475 WO2014040835A1 (en) 2012-09-11 2013-08-22 Wall ring for a fan with heating element

Publications (2)

Publication Number Publication Date
EP2895747A1 EP2895747A1 (en) 2015-07-22
EP2895747B1 true EP2895747B1 (en) 2017-05-31

Family

ID=49080860

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EP13753614.0A Active EP2895747B1 (en) 2012-09-11 2013-08-22 Wall ring for a fan with heating element

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US (1) US9816526B2 (en)
EP (1) EP2895747B1 (en)
CN (1) CN104619994B (en)
DE (1) DE102012108449A1 (en)
ES (1) ES2639095T3 (en)
HU (1) HUE035997T2 (en)
PL (1) PL2895747T3 (en)
WO (1) WO2014040835A1 (en)

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Also Published As

Publication number Publication date
CN104619994B (en) 2018-01-09
US9816526B2 (en) 2017-11-14
HUE035997T2 (en) 2018-06-28
CN104619994A (en) 2015-05-13
EP2895747A1 (en) 2015-07-22
PL2895747T3 (en) 2017-10-31
WO2014040835A1 (en) 2014-03-20
ES2639095T3 (en) 2017-10-25
DE102012108449A1 (en) 2014-03-13
US20150219117A1 (en) 2015-08-06

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