EP3608546B1 - Impeller for a fluid transport device and fluid transport device - Google Patents

Impeller for a fluid transport device and fluid transport device Download PDF

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Publication number
EP3608546B1
EP3608546B1 EP19190147.9A EP19190147A EP3608546B1 EP 3608546 B1 EP3608546 B1 EP 3608546B1 EP 19190147 A EP19190147 A EP 19190147A EP 3608546 B1 EP3608546 B1 EP 3608546B1
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EP
European Patent Office
Prior art keywords
impeller
impeller blade
disc
cover
blade
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EP19190147.9A
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German (de)
French (fr)
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EP3608546A1 (en
Inventor
Philipp Hessenbruch
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Miele und Cie KG
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Miele und Cie KG
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Publication of EP3608546A1 publication Critical patent/EP3608546A1/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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • 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
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/54—Building or constructing in particular ways by sheet metal manufacturing

Definitions

  • the invention relates to an impeller for a fluid delivery device according to the preamble of patent claim 1 and a fluid delivery device according to the preamble of patent claim 5.
  • the invention therefore faces the problem of producing a fluid delivery device with at least one impeller with less effort.
  • an impeller for a fluid delivery device with the features of patent claim 1, which is characterized in that rivets are formed in one piece on the impeller blade and rivet openings corresponding to the rivets are formed on the support disk and the cover disk, the rivets having the respective associated rivet openings in the installed position of the impeller are permanently engaged with each other, and wherein contact surfaces of the impeller blade with the support disk and the cover disk on the one hand and/or contact surfaces of the support disk and the cover disk with the impeller blade on the other side are designed in such a way that the impeller blade in the assembly position of the impeller rests essentially tightly against the support disk and the cover disk. Furthermore, this problem is solved by a fluid delivery device with the features of patent claim 5 .
  • the advantage that can be achieved with the invention consists in particular in the fact that a fluid conveying device with at least one impeller can be produced with less effort.
  • fan impellers made of aluminum in particular e.g. for vacuum cleaner fans
  • conventional impellers are subject to design tolerances and manufacturing tolerances conditional remaining gaps between the impeller blades and the cover or
  • the impellers can be painted by cathodic dip painting.
  • the painting of the impellers is comparatively complex, especially since the inner areas partially enclose air bubbles in the dip painting process.
  • parts of the gaps cannot be wetted and closed with paint.
  • Efficiency can thus be compromised compared to an impeller with completely closed gaps. Imbalances can also occur due to uneven paint application.
  • the paint is in most cases critical for the environment, so that environmental protection regulations must be observed when handling it. Painting the price of the wheels can therefore double compared to the unpainted wheels.
  • the invention enables a simplified and shortened manufacturing process compared to conventionally dip-coated impellers, an increase in (hydraulic) efficiency in particular compared to unpainted but also conventionally painted impellers, and a reduction in costs and environmental protection compared to painted impellers.
  • the invention allows the costs in the manufacture of aluminum impellers in particular to be significantly reduced. The omission of painting brings further advantages in terms of costs and environmental protection.
  • the invention can be used in all blowers, but also in pumps in which, for example, impellers (fan wheels) assembled from stamped parts are used.
  • the impeller according to the invention can be freely selected in terms of type, function, material, dimensioning and arrangement within wide, suitable limits.
  • the invention is therefore not limited to aluminum as a material.
  • the impeller can be made of any sheet metal material that can be caulked or crimped in the manner described.
  • a sealing geometry is formed on the impeller blade in a region of its respective contact surface with either the support disk and the cover disk.
  • the sealing geometry can also be formed on the support disk and the cover disk.
  • a further feature of the impeller according to the invention provides that the sealing geometry of the impeller blade is weakened in comparison to the rest of the impeller blade in its cross section. In this way, on the one hand, a simpler deformation of the sealing geometry is made possible for the purpose of producing a tight fit of the impeller blade on the support disk and on the cover disk. On the other hand, this saves material and weight.
  • the geometry can preferably be designed in such a way that it deforms during assembly without additional work steps (during the "caulking" when assembling the impellers). Furthermore, the grooves in the carrier and cover discs can be produced during production with or without an additional station in the stamping (and deep-drawing) tool.
  • the sealing geometry can be freely selected within wide suitable limits in terms of type, function, dimensioning, arrangement and shape.
  • An advantageous development of the impeller according to the invention provides that the sealing geometry has a wave profile in a top view of its free end. In this way, the sealing geometry is further improved.
  • the impeller according to the invention provides that at least one positioning projection is formed on the impeller blade and at least one positioning recess corresponding to the positioning projection is formed on the support disk and/or on the cover disk. In this way, proper positioning of the impeller blade relative to the support disk and the cover disk is reliably ensured.
  • an embodiment that does not fall under the scope of protection provides that the sealing geometries on the support disk and on the cover disk are each designed as a groove on the impeller blade side.
  • the sealing geometry formed on the support disk and on the cover disk is realized in a structurally particularly simple, robust and easy-to-assemble manner.
  • a sealing geometry additionally formed on the impeller blade is thereby unnecessary.
  • this embodiment has the advantage that an additional positioning of the impeller blade relative to the support disk and the cover disk is not necessary.
  • FIGs 1 to 3 an exemplary embodiment of the impeller according to the invention for a fluid conveying device is shown.
  • the fluid conveying device is a fan for a vacuum cleaner, comprising a housing and the impeller 2 arranged to be rotatable about an axis of rotation Figures 1 to 3 illustrated assembly position of the impeller 2 between the support disk 4 and the cover disk 6 arranged impeller blades 8.
  • Impeller blade 8 with the support disk 4 and the cover disk 6 is designed according to the invention in such a way that the respective impeller blade 8 rests essentially tightly against the support disk 4 and the cover disk 6 in the installed position of the impeller 2 . See in particular the Figures 5 to 8 .
  • a sealing geometry 16 is formed on the respective impeller blade 8 in a region of its respective contact surface 14 with the support disk 4 and the cover disk 6 . See the Figures 9 to 13 .
  • the sealing geometry 16 of the respective impeller blade 8 is in the Figures 10 to 13 variants shown weakened in comparison to the rest of the impeller blade 8 formed in the cross section, the cross section of the sealing geometry 16 in the direction of the free end in the variants according to FIG Figures 10 and 11 each is continuously reduced.
  • the sealing geometry 16 according to the 10 is designed like a knife edge, while the sealing geometry 16 according to the 11 has a sickle-like cross-section.
  • the sealing geometry 16 according to the 12 is designed as a straight paragraph.
  • the respective sealing geometry 16 according to the Figures 10 to 12 The variants shown can have a straight course over a main extension direction of the respective impeller blade 8 .
  • the main extension direction of the respective impeller blade 8 runs in the Figures 10 to 12 each perpendicular to the image plane.
  • the sealing geometry 16 has a wave profile in a plan view of its free end. See the 13 .
  • the main extension direction of the respective impeller blade 8 runs in the plane of FIG 13 from top to bottom.
  • a positioning projection 18 is formed on the respective impeller blade 8 and a positioning recess (not shown) corresponding to the positioning projection 18 is formed on the support disk 4 .
  • the impeller 2 is initially in a dismantling position; the support disk 4, the cover disk 6 and the impeller blades 8 are not yet connected to one another.
  • the respective impeller blade 8 in the dismantled position of the impeller 2 is in the 4 , 5 , 7 and 9 to 13 shown.
  • the rivets 10 of the respective impeller blade 8 are pushed through the rivet openings 12 of the support disk 4 and the cover disk 6 that correspond to the individual rivets 10 and applied to the specialist caulked or crimped in a known manner. Simultaneously with the insertion of the rivet 10 through the In each case corresponding rivet openings 12, the positioning projection 18 formed on the respective impeller blade 8 is also inserted into the corresponding positioning recess (not shown) in the support disk 4.
  • sealing geometries 20 are provided on the support disk 4 and on the cover disk 6, with the sealing geometries 20 each being designed as a groove on the rotor blade side.
  • the sealing geometries 20 each have the corresponding impeller blade 8 corresponding contact surfaces 22 which are formed such that the impeller blade 8 in the Figures 1 to 3 illustrated mounting position of the impeller 2 is substantially tight against the support disk 4 and the cover disk 6.
  • the contact surfaces 22 form a labyrinthine seal with the impeller blade 8 inserted into the sealing geometry 20 . See the 14 .
  • the invention is not limited to the present exemplary embodiment and to the explicitly explained variants of the sealing geometries.
  • the invention can also be used advantageously with other blowers as well as with pumps.

Description

Die Erfindung betrifft ein Laufrad für eine Fluidfördervorrichtung nach dem Oberbegriff des Patentanspruchs 1 und eine Fluidfördervorrichtung nach dem Oberbegriff des Patentanspruchs 5.The invention relates to an impeller for a fluid delivery device according to the preamble of patent claim 1 and a fluid delivery device according to the preamble of patent claim 5.

Derartige Laufräder für Fluidfördervorrichtungen und Fluidfördervorrichtungen sind aus dem Stand der Technik in einer Vielzahl von voneinander verschiedenen Ausführungsformen bereits vorbekannt. Die bekannten Laufräder umfassen beispielsweise eine Tragscheibe, eine Deckscheibe und mindestens eine in einer Montagelage des Laufrads zwischen der Tragscheibe und der Deckscheibe angeordnete Laufradschaufel. Die bekannten Fluidfördervorrichtungen sind beispielsweise als Gebläse oder als Pumpen ausgebildet.Such impellers for fluid conveying devices and fluid conveying devices are already known from the prior art in a large number of different embodiments. The known impellers include, for example, a support disk, a cover disk and at least one impeller blade arranged in an assembly position of the impeller between the support disk and the cover disk. The known fluid delivery devices are designed, for example, as fans or pumps.

Aus der JP 2010174718 A ist ein Laufrad einer Fluidfördervorrichtung bekannt, bei dem die Leitschaufeln verdickte Vorsprünge aufweisen, die durch entsprechende Aussparungen in der Trag- und Deckscheibe des Laufrads ragen und verstemmt werden.From the JP 2010174718 A an impeller of a fluid conveying device is known in which the guide vanes have thickened projections which protrude through corresponding recesses in the support and cover disk of the impeller and are caulked.

Aus der JP 2011208595 A ist ein Laufrad einer Fluidfördervorrichtung bekannt, bei dem die Leitschaufeln eine gegenüber der Leitschaufel dünnere und sich verjüngende Dichtrippe zur Deckscheibe des Laufrads aufweist.From the JP 2011208595 A an impeller of a fluid conveying device is known in which the guide vanes have a sealing rib that is thinner than the guide vane and tapers towards the cover disk of the impeller.

Der Erfindung stellt sich somit das Problem, eine Fluidfördervorrichtung mit mindestens einem Laufrad mit weniger Aufwand herzustellen.The invention therefore faces the problem of producing a fluid delivery device with at least one impeller with less effort.

Erfindungsgemäß wird dieses Problem durch ein Laufrad für eine Fluidfördervorrichtung mit den Merkmalen des Patentanspruchs 1 gelöst, das dadurch gekennzeichnet ist, dass an der Laufradschaufel einstückig Niete und an der Tragscheibe und der Deckscheibe zu den Nieten korrespondierende Nietöffnungen ausgebildet sind, wobei die Niete mit den jeweils zugeordneten Nietöffnungen in der Montagelage des Laufrads miteinander unlösbar in Eingriff sind, und wobei Kontaktflächen der Laufradschaufel mit der Tragscheibe und der Deckscheibe auf der einen Seite und/oder Kontaktflächen der Tragscheibe und der Deckscheibe mit der Laufradschaufel auf der anderen Seite, derart ausgebildet sind, dass die Laufradschaufel in der Montagelage des Laufrads im Wesentlichen dicht an der Tragscheibe und der Deckscheibe anliegt. Ferner wird dieses Problem durch eine Fluidfördervorrichtung mit den Merkmalen des Patentanspruchs 5 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen. Erfindungsgemäß wird kein Hilfsfügeteil eingesetzt, da die Nieten bzw. die verstemm-/crimpbaren Elemente an der Laufradschaufel mit angeformt sind, etwa durch Stanzen. Bei diesem "Verstemm- bzw. Crimpprozess" werden ggf. gleichzeitig auch bewusst geschwächte Bereiche der Laufradschaufeln mit verformt.According to the invention, this problem is solved by an impeller for a fluid delivery device with the features of patent claim 1, which is characterized in that rivets are formed in one piece on the impeller blade and rivet openings corresponding to the rivets are formed on the support disk and the cover disk, the rivets having the respective associated rivet openings in the installed position of the impeller are permanently engaged with each other, and wherein contact surfaces of the impeller blade with the support disk and the cover disk on the one hand and/or contact surfaces of the support disk and the cover disk with the impeller blade on the other side are designed in such a way that the impeller blade in the assembly position of the impeller rests essentially tightly against the support disk and the cover disk. Furthermore, this problem is solved by a fluid delivery device with the features of patent claim 5 . Advantageous refinements and developments of the invention result from the following dependent claims. According to the invention, no auxiliary joining part is used, since the rivets or the caulking/crimpable elements are also formed on the impeller blade, for example by stamping. During this "caulking or crimping process" deliberately weakened areas of the impeller blades may also be deformed at the same time.

Der mit der Erfindung erreichbare Vorteil besteht insbesondere darin, dass eine Fluidfördervorrichtung mit mindestens einem Laufrad mit weniger Aufwand herstellbar ist. Insbesondere bei Gebläse-Laufrädern aus Aluminium (z.B. für Staubsaugergebläse) geht bei herkömmlichen Laufrädern durch die konstruktiv und durch Toleranzen bei der Fertigung bedingten verbleibenden Spalte zwischen den Laufradschaufeln und der Deck- bzw.The advantage that can be achieved with the invention consists in particular in the fact that a fluid conveying device with at least one impeller can be produced with less effort. In the case of fan impellers made of aluminum in particular (e.g. for vacuum cleaner fans), conventional impellers are subject to design tolerances and manufacturing tolerances conditional remaining gaps between the impeller blades and the cover or

Tragscheibe ein relevanter Teil des Wirkungsgrades verloren. Um diese Wirkungsgradverluste zu vermeiden, werden die vorgenannten Spalte üblicherweise durch einen Lack verschlossen. Das Lackieren der Laufräder kann etwa durch kathodisches Tauchlackieren erfolgen. Die Lackierung der Laufräder ist vergleichsweise aufwändig, insbesondere, da die innenliegenden Bereiche im Tauchlackierverfahren teilweise Luftblasen einschließen. Dadurch können unter Umständen Teile der Spalte nicht mit Lack benetzt und verschlossen werden. Der Wirkungsgrad kann so im Vergleich zu einem Laufrad mit völlig geschlossenen Spalten beeinträchtigt werden. Zudem können durch ungleichmäßigen Lackauftrag Unwuchten auftreten. Weiterhin ist der Lack in den meisten Fällen kritisch für die Umwelt, so dass beim Umgang damit Umweltschutzauflagen eingehalten werden müssen. Durch das Lackieren kann der Preis für die Laufräder daher insgesamt bis auf das Doppelte gegenüber dem unlackierten Laufrad ansteigen. Mittels der Erfindung ist ein vereinfachter und verkürzter Herstellungsprozess gegenüber herkömmlich tauchlackierten Laufrädern, eine Steigerung des (hydraulischen) Wirkungsgrades insbesondere gegenüber unlackierten aber auch herkömmlich lackierten Laufrädern, sowie eine Reduzierung der Kosten und Schonung der Umwelt gegenüber lackierten Laufrädern ermöglicht. Durch die Erfindung können die Kosten bei der Herstellung von insbesondere Aluminiumlaufrädern deutlich verringert werden. Der Wegfall der Lackierung bringt weitere Vorteile hinsichtlich Kosten und Umweltschutz. Die Erfindung kann bei allen Gebläsen eingesetzt werden, aber auch bei Pumpen, bei denen beispielsweise aus Stanzteilen montierte Laufräder (Lüfterräder) verwendet werden. Grundsätzlich ist das erfindungsgemäße Laufrad nach Art, Funktionsweise, Material, Dimensionierung und Anordnung in weiten geeigneten Grenzen frei wählbar. Die Erfindung ist also nicht auf Aluminium als Werkstoff beschränkt. Grundsätzlich kann das Laufrad aus jedem Werkstoff in Blechform hergestellt werden, der sich in der beschriebenen Weise verstemmen bzw. vercrimpen lässt.Support disc lost a relevant part of the efficiency. In order to avoid this loss of efficiency, the aforementioned gaps are usually sealed with a varnish. The impellers can be painted by cathodic dip painting. The painting of the impellers is comparatively complex, especially since the inner areas partially enclose air bubbles in the dip painting process. As a result, under certain circumstances, parts of the gaps cannot be wetted and closed with paint. Efficiency can thus be compromised compared to an impeller with completely closed gaps. Imbalances can also occur due to uneven paint application. Furthermore, the paint is in most cases critical for the environment, so that environmental protection regulations must be observed when handling it. Painting the price of the wheels can therefore double compared to the unpainted wheels. The invention enables a simplified and shortened manufacturing process compared to conventionally dip-coated impellers, an increase in (hydraulic) efficiency in particular compared to unpainted but also conventionally painted impellers, and a reduction in costs and environmental protection compared to painted impellers. The invention allows the costs in the manufacture of aluminum impellers in particular to be significantly reduced. The omission of painting brings further advantages in terms of costs and environmental protection. The invention can be used in all blowers, but also in pumps in which, for example, impellers (fan wheels) assembled from stamped parts are used. In principle, the impeller according to the invention can be freely selected in terms of type, function, material, dimensioning and arrangement within wide, suitable limits. The invention is therefore not limited to aluminum as a material. In principle, the impeller can be made of any sheet metal material that can be caulked or crimped in the manner described.

Erfindungsgemäß ist vorgesehen, dass an der Laufradschaufel in einem Bereich von deren jeweiliger Kontaktfläche mit entweder der Tragscheibe und der Deckscheibe eine Dichtgeometrie ausgebildet ist. Die Dichtgeometrie kann zusätzlich auch an der Tragscheibe und an der Deckscheibe ausgebildet sein. Hierdurch ist es möglich, dass keine zusätzlichen Dichtelemente erforderlich sind, um die gewünschte Abdichtung zwischen der Laufradschaufel auf der einen Seite und der Tragscheibe und der Deckscheibe auf der anderen Seite herzustellen. Entsprechend entfällt auch die Montage oder Aufbringung derartiger zusätzlicher Dichtelemente.According to the invention, it is provided that a sealing geometry is formed on the impeller blade in a region of its respective contact surface with either the support disk and the cover disk. The sealing geometry can also be formed on the support disk and the cover disk. This makes it possible that no additional sealing elements are required in order to produce the desired seal between the impeller blade on the one hand and the support disk and the cover disk on the other side. Accordingly, the assembly or application of such additional ones is also eliminated sealing elements.

Ein weiteres Merkmal des erfindungsgemäßen Laufrads sieht vor, dass die Dichtgeometrie der Laufradschaufel im Vergleich zu dem Rest der Laufradschaufel in deren Querschnitt geschwächt ausgebildet ist. Auf diese Weise ist zum einem eine einfachere Verformung der Dichtgeometrie zwecks Herstellung einer dichten Anlage der Laufradschaufel an der Tragscheibe und an der Deckscheibe ermöglicht. Zum anderen ist dadurch Material und Gewicht eingespart.A further feature of the impeller according to the invention provides that the sealing geometry of the impeller blade is weakened in comparison to the rest of the impeller blade in its cross section. In this way, on the one hand, a simpler deformation of the sealing geometry is made possible for the purpose of producing a tight fit of the impeller blade on the support disk and on the cover disk. On the other hand, this saves material and weight.

Eine vorteilhafte Weiterbildung der letztgenannten Ausführungsform des erfindungsgemäßen Laufrads sieht vor, dass der Querschnitt der Dichtgeometrie in Richtung von deren freien Ende kontinuierlich reduziert ist. Hierdurch ist eine einfache und damit leichte Verformung der Dichtgeometrie realisierbar, ohne, dass dabei die Stabilität der Laufradschaufel in ungewünschter Weise beeinträchtigt wird.An advantageous development of the last-mentioned embodiment of the impeller according to the invention provides that the cross section of the sealing geometry is continuously reduced in the direction of its free end. As a result, a simple and therefore slight deformation of the sealing geometry can be implemented without the stability of the impeller blade being impaired in an undesired manner.

Bevorzugt kann die Geometrie so ausgelegt sein, daß sie sich während der Montage ohne zusätzliche Arbeitsschritte verformt (während des "Verstemmens" bei der Montage der Laufräder). Weiter können die Nuten in den Trag- und Deckscheiben bei der Herstellung mit oder auch ohne eine zusätzliche Station im Stanz (und -Tiefzieh) -Werkzeug hergestellt werden.The geometry can preferably be designed in such a way that it deforms during assembly without additional work steps (during the "caulking" when assembling the impellers). Furthermore, the grooves in the carrier and cover discs can be produced during production with or without an additional station in the stamping (and deep-drawing) tool.

Grundsätzlich ist die Dichtgeometrie jedoch nach Art, Funktionsweise, Dimensionierung, Anordnung und Form in weiten geeigneten Grenzen frei wählbar. Eine vorteilhafte Weiterbildung des erfindungsgemäßen Laufrads sieht vor, dass die Dichtgeometrie in einer Draufsicht auf deren freies Ende ein Wellenprofil aufweist. Auf diese Weise ist die Dichtgeometrie weiter verbessert.In principle, however, the sealing geometry can be freely selected within wide suitable limits in terms of type, function, dimensioning, arrangement and shape. An advantageous development of the impeller according to the invention provides that the sealing geometry has a wave profile in a top view of its free end. In this way, the sealing geometry is further improved.

Eine andere vorteilhafte Weiterbildung des erfindungsgemäßen Laufrads sieht vor, dass an der Laufradschaufel mindestens ein Positioniervorsprung und an der Tragscheibe und/oder an der Deckscheibe mindestens eine zu dem Positioniervorsprung korrespondierende Positionierausnehmung ausgebildet sind. Auf diese Weise ist eine ordnungsgemäße Positionierung der Laufradschaufel relativ zu der Tragscheibe und der Deckscheibe sicher gewährleistet.Another advantageous development of the impeller according to the invention provides that at least one positioning projection is formed on the impeller blade and at least one positioning recess corresponding to the positioning projection is formed on the support disk and/or on the cover disk. In this way, proper positioning of the impeller blade relative to the support disk and the cover disk is reliably ensured.

Eine nicht unter den Schutzbereich fallende Ausführung sieht vor, dass die Dichtgeometrien an der Tragscheibe und an der Deckscheibe jeweils als eine laufradschaufelseitige Nut ausgebildet sind. Hierdurch ist die an der Tragscheibe und an der Deckscheibe jeweils ausgebildete Dichtgeometrie auf konstruktiv besonders einfache, robuste und montagefreundliche Weise realisiert. Beispielsweise ist es denkbar, dass eine zusätzlich an der Laufradschaufel ausgebildete Dichtgeometrie dadurch entbehrlich ist. Ferner hat diese Ausführungsform den Vorteil, dass eine zusätzliche Positionierung der Laufradschaufel relativ zu der Tragscheibe und der Deckscheibe entbehrlich ist.An embodiment that does not fall under the scope of protection provides that the sealing geometries on the support disk and on the cover disk are each designed as a groove on the impeller blade side. As a result, the sealing geometry formed on the support disk and on the cover disk is realized in a structurally particularly simple, robust and easy-to-assemble manner. For example, it is conceivable that a sealing geometry additionally formed on the impeller blade is thereby unnecessary. Furthermore, this embodiment has the advantage that an additional positioning of the impeller blade relative to the support disk and the cover disk is not necessary.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt

Figur 1
ein Ausführungsbeispiel des erfindungsgemäßen Laufrads in einer Seitenansicht, in teilweiser Darstellung,
Figur 2
das Ausführungsbeispiel in einer Draufsicht,
Figur 3
das Ausführungsbeispiel in einer seitlichen Schnittdarstellung,
Figur 4
eine Seitenansicht einer Laufradschaufel des Laufrads gemäß dem vorliegenden Ausführungsbeispiel, in einer Demontagelage,
Figur 5
die Laufradschaufel in einer teilweisen Seitenansicht, in einer Demontagelage,
Figur 6
die Laufradschaufel in einer teilweisen Seitenansicht, in einer Montagelage,
Figur 7
die Laufradschaufel in einem Querschnitt, in der Demontagelage,
Figur 8
die Laufradschaufel in einem Querschnitt, in der Montagelage,
Figur 9
die Laufradschaufel in einer teilweisen Seitenansicht, in der Demontagelage,
Figur 10
eine erste Variante der Dichtgeometrie der Laufradschaufel in einem Querschnitt, in teilweiser Darstellung,
Figur 11
eine zweite Variante der Dichtgeometrie der Laufradschaufel in einem Querschnitt, in teilweiser Darstellung,
Figur 12
eine dritte Variante der Dichtgeometrie der Laufradschaufel in einem Querschnitt, in teilweiser Darstellung,
Figur 13
eine vierte Variante der Dichtgeometrie der Laufradschaufel in einer Draufsicht, in teilweiser Darstellung und
Figur 14
eine nicht erfindungsgemäße
An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows
figure 1
an embodiment of the impeller according to the invention in a side view, in partial representation,
figure 2
the embodiment in a plan view,
figure 3
the embodiment in a lateral sectional view,
figure 4
a side view of an impeller blade of the impeller according to the present embodiment, in a disassembled position,
figure 5
the impeller blade in a partial side view, in a disassembled position,
figure 6
the impeller blade in a partial side view, in an assembly position,
figure 7
the impeller blade in a cross-section, in the disassembled position,
figure 8
the impeller blade in a cross-section, in the assembly position,
figure 9
the impeller blade in a partial side view, in the disassembled position,
figure 10
a first variant of the sealing geometry of the impeller blade in a cross section, in partial representation,
figure 11
a second variant of the sealing geometry of the impeller blade in a cross section, in partial representation,
figure 12
a third variant of the sealing geometry of the impeller blade in a cross section, in partial representation,
figure 13
a fourth variant of the sealing geometry of the impeller blade in a top view, in a partial representation and
figure 14
one not according to the invention

Variante der Dichtgeometrie der Tragscheibe und der Deckscheibe, in einer teilweisen Darstellung.Variant of the sealing geometry of the support disc and the cover disc, in a partial representation.

In den Fig. 1 bis 3 ist ein Ausführungsbeispiel des erfindungsgemäßen Laufrads für eine Fluidfördervorrichtung dargestellt. Bei der nicht dargestellten Fluidfördervorrichtung handelt es sich um ein Gebläse für einen Staubsauger, umfassend ein Gehäuse und das um eine Drehachse drehbar angeordnete Laufrad 2. Das Laufrad 2 umfasst eine Tragscheibe 4, eine Deckscheibe 6 und eine Mehrzahl von in einer in den Fig. 1 bis 3 dargestellten Montagelage des Laufrads 2 zwischen der Tragscheibe 4 und der Deckscheibe 6 angeordneten Laufradschaufeln 8. Zwecks Befestigung der Laufradschaufeln 8 an der Tragscheibe 4 und der Deckscheibe 6 sind an der jeweiligen Laufradschaufel 8 Niete 10 und an der Tragscheibe 4 und der Deckscheibe 6 zu den Nieten 10 korrespondierende Nietöffnungen 12 ausgebildet, wobei die Niete 10 mit den jeweils zugeordneten Nietöffnungen 12 in der Montagelage des Laufrads 2 miteinander unlösbar in Eingriff sind.In the Figures 1 to 3 an exemplary embodiment of the impeller according to the invention for a fluid conveying device is shown. The fluid conveying device, not shown, is a fan for a vacuum cleaner, comprising a housing and the impeller 2 arranged to be rotatable about an axis of rotation Figures 1 to 3 illustrated assembly position of the impeller 2 between the support disk 4 and the cover disk 6 arranged impeller blades 8. For the purpose of fastening the impeller blades 8 to the support disk 4 and the cover disk 6 are on the respective impeller blade 8 rivets 10 and on the support disk 4 and the cover disk 6 to the rivets 10 corresponding rivet openings 12 are formed, the rivets 10 with the respective associated rivet openings 12 in the mounted position of the impeller 2 are inextricably engaged with one another.

In den Varianten gemäß der Fig. 10 bis 13 sind Kontaktflächen 14 der jeweiligenIn the variants according to the Figures 10 to 13 are contact surfaces 14 of the respective

Laufradschaufel 8 mit der Tragscheibe 4 und der Deckscheibe 6 erfindungsgemäß derart ausgebildet, dass die jeweilige Laufradschaufel 8 in der Montagelage des Laufrads 2 im Wesentlichen dicht an der Tragscheibe 4 und der Deckscheibe 6 anliegt. Siehe hierzu insbesondere die Fig. 5 bis 8. Hierzu ist an der jeweiligen Laufradschaufel 8 in einem Bereich von deren jeweiliger Kontaktfläche 14 mit der Tragscheibe 4 und der Deckscheibe 6 eine Dichtgeometrie 16 ausgebildet. Siehe hierzu die Fig. 9 bis 13. Wie aus den Fig. 10 bis 13 hervorgeht, ist die Dichtgeometrie 16 der jeweiligen Laufradschaufel 8 in den in den Fig. 10 bis 13 gezeigten Varianten im Vergleich zu dem Rest der Laufradschaufel 8 in deren Querschnitt geschwächt ausgebildet, wobei der Querschnitt der Dichtgeometrie 16 in Richtung von deren freien Ende bei den Varianten gemäß der Fig. 10 und 11 jeweils kontinuierlich reduziert ist. Die Dichtgeometrie 16 gemäß der Fig. 10 ist messerschneidenartig ausgebildet, während die Dichtgeometrie 16 gemäß der Fig. 11 einen sichelartigen Querschnitt aufweist. Die Dichtgeometrie 16 gemäß der Fig. 12 ist als ein gerader Absatz ausgebildet. Die jeweilige Dichtgeometrie 16 gemäß den in den Fig. 10 bis 12 gezeigten Varianten kann einen über eine Haupterstreckungsrichtung der jeweiligen Laufradschaufel 8 geraden Verlauf aufweisen. Die Haupterstreckungsrichtung der jeweiligen Laufradschaufel 8 verläuft in den Fig. 10 bis 12 jeweils senkrecht zur Bildebene. Denkbar ist aber auch, dass die Dichtgeometrie 16 in einer Draufsicht auf deren freies Ende ein Wellenprofil aufweist. Siehe hierzu die Fig. 13. Die Haupterstreckungsrichtung der jeweiligen Laufradschaufel 8 verläuft in der Bildebene von Fig. 13 von oben nach unten.Impeller blade 8 with the support disk 4 and the cover disk 6 is designed according to the invention in such a way that the respective impeller blade 8 rests essentially tightly against the support disk 4 and the cover disk 6 in the installed position of the impeller 2 . See in particular the Figures 5 to 8 . For this purpose, a sealing geometry 16 is formed on the respective impeller blade 8 in a region of its respective contact surface 14 with the support disk 4 and the cover disk 6 . See the Figures 9 to 13 . How from the Figures 10 to 13 shows, the sealing geometry 16 of the respective impeller blade 8 is in the Figures 10 to 13 variants shown weakened in comparison to the rest of the impeller blade 8 formed in the cross section, the cross section of the sealing geometry 16 in the direction of the free end in the variants according to FIG Figures 10 and 11 each is continuously reduced. The sealing geometry 16 according to the 10 is designed like a knife edge, while the sealing geometry 16 according to the 11 has a sickle-like cross-section. The sealing geometry 16 according to the 12 is designed as a straight paragraph. The respective sealing geometry 16 according to the Figures 10 to 12 The variants shown can have a straight course over a main extension direction of the respective impeller blade 8 . The main extension direction of the respective impeller blade 8 runs in the Figures 10 to 12 each perpendicular to the image plane. However, it is also conceivable that the sealing geometry 16 has a wave profile in a plan view of its free end. See the 13 . The main extension direction of the respective impeller blade 8 runs in the plane of FIG 13 from top to bottom.

Ferner sind an der jeweiligen Laufradschaufel 8 ein Positioniervorsprung 18 und an der Tragscheibe 4 jeweils eine zu dem Positioniervorsprung 18 korrespondierende, nicht dargestellte Positionierausnehmung ausgebildet.Furthermore, a positioning projection 18 is formed on the respective impeller blade 8 and a positioning recess (not shown) corresponding to the positioning projection 18 is formed on the support disk 4 .

Im Nachfolgenden wird die Funktionsweise des erfindungsgemäßen Laufrads gemäß dem vorliegenden Ausführungsbeispiel und anhand der Fig. 1 bis 13 näher erläutert.In the following, the functioning of the impeller according to the present embodiment and based on the Figures 1 to 13 explained in more detail.

Das Laufrad 2 befindet sich zunächst in einer Demontagelage; die Tragscheibe 4, die Deckscheibe 6 und die Laufradschaufeln 8 sind also noch nicht miteinander verbunden. Die jeweilige Laufradschaufel 8 in der Demontagelage des Laufrads 2 ist in den Fig. 4, 5, 7 und 9 bis 13 gezeigt.The impeller 2 is initially in a dismantling position; the support disk 4, the cover disk 6 and the impeller blades 8 are not yet connected to one another. The respective impeller blade 8 in the dismantled position of the impeller 2 is in the 4 , 5 , 7 and 9 to 13 shown.

Zwecks unlösbarer Verbindung der Laufradschaufeln 8 zum einen mit der Tragscheibe 4 und zum anderen mit der Deckscheibe 6 werden die Niete 10 der jeweiligen Laufradschaufel 8 durch die zu den einzelnen Nieten 10 korrespondierenden Nietöffnungen 12 der Tragscheibe 4 und der Deckscheibe 6 hindurchgesteckt und auf dem Fachmann an sich bekannte Weise verstemmt bzw. vercrimpt. Gleichzeitig mit dem Hindurchstecken der Niete 10 durch die jeweils korrespondierenden Nietöffnungen 12 wird auch der an der jeweiligen Laufradschaufel 8 ausgebildete Positioniervorsprung 18 in die korrespondierende, nicht dargestellte Positionierausnehmung in der Tragscheibe 4 eingesteckt.For the non-detachable connection of the impeller blades 8 to the support disk 4 and to the cover disk 6, the rivets 10 of the respective impeller blade 8 are pushed through the rivet openings 12 of the support disk 4 and the cover disk 6 that correspond to the individual rivets 10 and applied to the specialist caulked or crimped in a known manner. Simultaneously with the insertion of the rivet 10 through the In each case corresponding rivet openings 12, the positioning projection 18 formed on the respective impeller blade 8 is also inserted into the corresponding positioning recess (not shown) in the support disk 4.

Siehe hierzu insbesondere die Fig. 6 und 8. Wie aus einer Zusammenschau der Fig. 5 bis 8 hervorgeht, werden dabei nicht lediglich die Niete 10 verstemmt bzw. vercrimpt, so dass die Laufradschaufeln 8 jeweils mit der Tragscheibe 4 und der Deckscheibe 6 fest und unlösbar verbunden sind. Gleichzeitig werden dabei auch die an den Laufradschaufeln 8 ausgebildeten Dichtgeometrien 16 derart verformt, dass die Kontaktflächen 14 der Laufradschaufeln 8 mit der Tragscheibe 4 und der Deckscheibe 6 im Wesentlichen an der Tragscheibe 4 und der Deckscheibe 6 dicht anliegen.See in particular the Figures 6 and 8 . As if from a synopsis of Figures 5 to 8 shows, not only the rivets 10 are caulked or crimped, so that the impeller blades 8 are each firmly and undetachably connected to the support disk 4 and the cover disk 6 . At the same time, the sealing geometries 16 formed on the impeller blades 8 are deformed in such a way that the contact surfaces 14 of the impeller blades 8 with the support disk 4 and the cover disk 6 are essentially in close contact with the support disk 4 and the cover disk 6 .

Gemäß einer nicht unter den Schutzbereich fallenden Variante ist es vorgesehen, dass an der Tragscheibe 4 und an der Deckscheibe 6 Dichtgeometrien 20 vorgesehen sind, wobei die Dichtgeometrien 20 jeweils als eine laufradschaufelseitige Nut ausgebildet ist. Die Dichtgeometrien 20 weisen jeweils zu der korrespondierenden Laufradschaufel 8 korrespondierende Kontaktflächen 22 auf, die derart ausgebildet sind, dass die Laufradschaufel 8 in der in den Fig. 1 bis 3 dargestellten Montagelage des Laufrads 2 im Wesentlichen dicht an der Tragscheibe 4 und der Deckscheibe 6 anliegt. Die Kontaktflächen 22 bilden mit der in die Dichtgeometrie 20 eingesteckte Laufradschaufel 8 eine labyrinthartige Dichtung aus. Siehe hierzu die Fig. 14.According to a variant that does not fall under the scope of protection, it is provided that sealing geometries 20 are provided on the support disk 4 and on the cover disk 6, with the sealing geometries 20 each being designed as a groove on the rotor blade side. The sealing geometries 20 each have the corresponding impeller blade 8 corresponding contact surfaces 22 which are formed such that the impeller blade 8 in the Figures 1 to 3 illustrated mounting position of the impeller 2 is substantially tight against the support disk 4 and the cover disk 6. The contact surfaces 22 form a labyrinthine seal with the impeller blade 8 inserted into the sealing geometry 20 . See the 14 .

Die Erfindung ist nicht auf das vorliegende Ausführungsbeispiel und auf die explizit erläuterten Varianten der Dichtgeometrien begrenzt. Beispielsweise ist die Erfindung auch bei anderen Gebläsen wie auch bei Pumpen vorteilhaft einsetzbar.The invention is not limited to the present exemplary embodiment and to the explicitly explained variants of the sealing geometries. For example, the invention can also be used advantageously with other blowers as well as with pumps.

Claims (6)

  1. Impeller (2) for a fluid-conveying device, comprising a support disc (4), a cover disc (6) and at least one impeller blade (8) which is arranged between the support disc (4) and the cover disc (6) when the impeller (2) is in an assembled position, rivets (10) being formed on the impeller blade (8), and rivet openings (12) corresponding to the rivets (10) being formed on the support disc (4) and the cover disc (6), the rivets (10) being permanently engaged with the respectively associated rivet openings (12) when the impeller (2) is in the assembled position, and contact surfaces (14) of the impeller blade (8) with the support disc (4) and the cover disc (6) being formed and/or contact surfaces (22) of the support disc (4) and the cover disc (6) with the impeller blade (8) being formed in such a way that the impeller blade (8), when the impeller (2) is in the assembled position, substantially sealingly abuts against the support disc (4) and the cover disc (6), characterized in that a sealing geometry (16) is formed on the impeller blade (8) in a region of its particular contact surface (14) with the support disc (4) and the cover disc (6), the sealing geometry (16) of the impeller blade (8) being weakened in its cross section by comparison with the remainder of the impeller blade (8), and the sealing geometry (16) being deformed in such a way that the contact surfaces (14) of the impeller blades (8) with the support disc (4) and the cover disc (6) sealingly abut against the support disc (4) and the cover disc (6).
  2. Impeller (2) according to claim 1, characterised in that the cross section of the sealing geometry (16) is continuously reduced in the direction of its free end.
  3. Impeller (2) according to either claim 1 or claim 2, characterised in that, in a plan view of its free end, the sealing geometry (16) has a wave profile.
  4. Impeller (2) according to any of claims 1 to 3, characterised in that at least one positioning projection (18) is formed on the impeller blade (8), and at least one positioning recess corresponding to the positioning projection (18) is formed on the support disc (4) and/or on the cover disc.
  5. Impeller (2) according to any of claims 1 to 4, characterised in that the rivets (10) are permanently connected to the respectively associated rivet openings (12) by means of crimping.
  6. Fluid-conveying device, comprising a housing and an impeller arranged in the housing so as to be rotatable about an axis of rotation, characterised in that the impeller is designed according to any of claims 1 to 5.
EP19190147.9A 2018-08-06 2019-08-06 Impeller for a fluid transport device and fluid transport device Active EP3608546B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021005121A1 (en) 2021-10-13 2023-04-13 KSB SE & Co. KGaA Impeller with teeth in the cover plate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240052850A1 (en) * 2020-12-14 2024-02-15 Volvo Truck Corporation Centrifugal fan assembly for a heat exchanger system in a vehicle

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Publication number Priority date Publication date Assignee Title
FR608797A (en) * 1925-01-22 1926-08-02 Anciens Ets Skoda Blades for rotors of rotating machines
DE10252538B4 (en) * 2002-11-08 2009-12-24 Motec Components Gmbh & Co. Kg Blower wheel and method for its production
JP2010174718A (en) * 2009-01-29 2010-08-12 Panasonic Corp Electric blower and vacuum cleaner using the same
JP2011208595A (en) * 2010-03-30 2011-10-20 Panasonic Corp Electric blower and vacuum cleaner
JP6774595B2 (en) * 2016-02-26 2020-10-28 日本電産株式会社 Impeller, blower, and method of manufacturing the impeller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021005121A1 (en) 2021-10-13 2023-04-13 KSB SE & Co. KGaA Impeller with teeth in the cover plate

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