EP2748467B1 - Paddle wheel for a fluid delivery device, and domestic appliance having a paddle wheel - Google Patents
Paddle wheel for a fluid delivery device, and domestic appliance having a paddle wheel Download PDFInfo
- Publication number
- EP2748467B1 EP2748467B1 EP12751042.8A EP12751042A EP2748467B1 EP 2748467 B1 EP2748467 B1 EP 2748467B1 EP 12751042 A EP12751042 A EP 12751042A EP 2748467 B1 EP2748467 B1 EP 2748467B1
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- Prior art keywords
- paddle
- paddle wheel
- walls
- blade
- connecting web
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- 239000012530 fluid Substances 0.000 title claims description 16
- 238000000034 method Methods 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims 1
- 238000005457 optimization Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000001968 nicotinic acid Nutrition 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/247—Vanes elastic or self-adjusting
Definitions
- the present invention relates to a paddle wheel for a fluid conveying device with a plurality of blades distributed over a wheel circumference of the paddle wheel, which blades each have blade walls tapered towards an associated blade tip. Moreover, the present invention relates to a household appliance with such a paddle wheel.
- Such a paddle wheel is from the GB 352,507 A known.
- a screw propeller having three blades which are flexible to accommodate varying environmental conditions in operation of the screw propeller in water. Elastic rotation of the vanes is intended to allow smooth and shock-free transmission of force and, moreover, vortices at the vane end and torsions in the flow from the vane propeller are to be reduced.
- a component for absorbing forces which has a flexible outer skin.
- struts are vertically engageable with the outer skin via a flexible fastening means in operative connection.
- a force acting on the outer skin is transmitted to the struts, wherein an upper end of the struts and a lower end of the struts always perform an opposite movement about the vertical axis.
- the present invention relates to a paddle wheel, or impeller, for a device for conveying fluids.
- the fluids may be gaseous (eg air) or liquid (for example water).
- Corresponding conveyors are accordingly also referred to as Schaufelrad- or impeller pumps and are per se, for example, as water pumps for washing machines from the German Offenlegungsschrift DE 195 37 944 A1 or the German Patent DE 10 2008 054 998 B3 known.
- paddle wheels which can promote an increased volume flow through a curved or curved blade shape in the main direction of rotation defined therewith and thus are correspondingly more efficient.
- the flow-guiding part is designed as a multi-component injection-molded part with a basic structure of a rigid, preferably fiber-reinforced plastic as the first and with the elastomer as the second component.
- the curved or blade-shaped blades of the impeller are designed to be rigid by the basic structure.
- an object of the invention is to provide a paddle wheel for a fluid delivery device and a household appliance with a fluid conveying device, which is characterized by an increased conveying efficiency, in particular in a conveying operation in alternating conveying directions.
- the blades distributed over a wheel circumference of the blade wheel are each provided with blade walls tapering towards an associated blade tip made of elastic material that allows for correct operation or pressurization elastic deformation (curvature) of the blade.
- the mutually facing inner sides of the blade walls are each connected to at least one force-transmitting element (connecting web).
- This connecting web is aligned and hinged so that the elastic blade walls under normal operation pressurization of one of its outer sides through the connecting web move so that adjusts a (possibly increasing) curvature of the blade profile to the side of the load or pressurization out.
- the blades of the blade wheel according to the invention thus show a behavior which corresponds to the so-called "Fin Ray (fin jet) effect".
- This principle which is known in principle from bionics, has hitherto been found in the art of applications which involve optimally adapting a body or boundary wall to another body, such as, for example, the contact surface of a towing lug with the user's body contours ( DE 20 2009 010 377 U1 ) or the shape optimization of a wringing funnel for a mop ( DE 10 2006 045 615 B3 ) - goes.
- a project sheet "Finrayeffect.pdf" on the website www.bionische-innovationen.de the use of this effect for form-matched joint fills known.
- an operationally adapted optimization of the blade shape is realized both with respect to stepwise or continuously increasing load and in particular when the direction of rotation of the paddle wheel is reversed.
- an optimized blade shape adapted to the specific load and in particular to the alternating direction of rotation or conveying direction of the fluid is realized.
- an extremely powerful Schaufelradgestalt is ensured, which leads to a significantly reduced energy consumption and allows a smaller dimensioning of the Schaufelradantriebs.
- when used in a tumble dryer treatment times can be significantly reduced.
- these aspects are becoming increasingly important for marketing as well.
- the at least one connecting web is dimensioned in its elasticity so that it escapes elastically in the form of a buckling bar in a pressurized operation.
- This embodiment allows a particularly continuous shape optimization of the blade profile and a particularly material-friendly and reliable return of the blade in its initial geometry when the pressurization decreases or ends.
- the at least one connecting web is rotatably connected with its ends via at least one film hinge with the respective inner side.
- This embodiment of the invention is characterized by a particularly easy to manufacture connection of the connecting web with the respective inner side and gives the blade with only one degree of freedom in the movement of the connecting web a particularly high stability.
- this and thus the paddle wheel can be realized with particularly low weight, whereby the centrifugal forces and the masses of the paddle wheel to be accelerated are reduced while reducing the wear and the energy requirement.
- the blade walls and the at least one connecting web are made in one piece from a plastic.
- the mutually facing inner sides of the blade walls of a blade are connected to one another via a plurality of connecting webs.
- a domestic appliance for laundry treatment is equipped with a fluid conveying device which has a paddle wheel of the type described above.
- a fluid conveying device which has a paddle wheel of the type described above.
- a particularly preferred application is a household appliance in the form of a tumble dryer, in which the paddle wheel according to the invention serves to convey a process air stream and / or a cooling air stream.
- FIG. 1 shows a fluid conveying device 1 in the form of a paddle wheel fan for the promotion of only schematically illustrated process air stream 2 in a tumble dryer 3 not shown.
- the fluid conveyor can be a self-sufficient drive, for example in the form of an electric motor 4 or via a V-belt 5 and a corresponding V-belt pulley 6 via an axis 7 a paddle wheel 8 to promote the process air stream 2 drive.
- the paddle wheel 8 includes a plurality of blades 9 distributed uniformly over its circumference, of which in the view FIG. 1 by way of example only two blades 14, 15 are designated.
- the blades are - as related to even closer FIG. 2 explained - designed as hollow profiles and end with their respective foot region 14a, 15a in a conventional manner to a paddle wheel hub 18. Radially outward, the blades end at their respective blade tip 14b, 15b.
- each blade consists of two blade walls 20, 21 which converge towards the respective blade tip 14b to form an acute angle 23.
- the blade walls 20, 21 each have an inner side 20a, 21a and an outer side 20b, 21b.
- Between facing inner sides 20a, 21a extend approximately horizontally or concentrically to the paddle wheel hub 18 a plurality of connecting webs 24, 25 and 26.
- the ends of the connecting webs are each a film hinge 28, 29 with the blade walls 20, 21st rotatably connected.
- the connecting webs are dimensioned so and consist of such an elastic material that they bend, as described below, under pressure pressure of one of the blade walls arcuately elastic.
- the elements shown are in one piece and made of an elastic plastic.
- the blade tip 14a moves in the opposite direction until finally back to its original position by the elastic curvature of the blade walls is formed back and this process by the force-transmitting connecting webs, which also elastic return to their original form becomes.
- the advantage here is that the degree of curvature and thus the profile adjustment of the blade can be optimally adjusted to the respective load situation. This can be used in particular the choice of material, the arrangement and the dimensioning of the connecting webs.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Description
Die vorliegende Erfindung betrifft ein Schaufelrad für eine Fluidfördereinrichtung mit mehreren über einen Radumfang des Schaufelrades verteilten Schaufeln, die jeweils zu einer zugehörigen Schaufelspitze hin zulaufende Schaufelwände aufweisen. Außerdem betrifft die vorliegende Erfindung ein Haushaltsgerät mit einem solchen Schaufelrad.The present invention relates to a paddle wheel for a fluid conveying device with a plurality of blades distributed over a wheel circumference of the paddle wheel, which blades each have blade walls tapered towards an associated blade tip. Moreover, the present invention relates to a household appliance with such a paddle wheel.
Eine solches Schaufelrad ist aus der
Aus der
Die vorliegende Erfindung bezieht sich auf ein Schaufelrad, oder auch Flügelrad genannt, für eine Einrichtung zum Fördern von Fluiden. Die Fluide können dabei gasförmig (z.B. Luft) oder flüssig (beispielsweise Wasser) sein. Entsprechende Fördereinrichtungen werden demgemäß auch als Schaufelrad- oder Flügelradpumpen bezeichnet und sind an sich beispielsweise als Wasserpumpen für Waschmaschinen aus der Deutschen Offenlegungsschrift
Bei diesen bekannten Schaufelradpumpen sind die Schaufeln bzw. Flügel des Schaufelrades bzw. Flügelrades bezüglich ihrer Vertikalachse häufig symmetrisch ausgebildet. Damit haben diese Schaufelräder zwar in beiden Drehrichtungen eine gleich große Leistungsfähigkeit und können entsprechend drehrichtungsunabhängig den gleichen Volumenstrom fördern. Die Schaufelkontur und damit die Förderleistung sind strömungstechnisch insoweit aber nicht optimiert.In these known impeller pumps, the blades or vanes of the impeller or impeller are often symmetrical with respect to their vertical axis educated. Thus, these paddle wheels, although in both directions of equal performance and can promote according to the direction of rotation independent of the same volume flow. The blade contour and thus the delivery rate are so far not optimized in terms of flow.
Es sind auch Schaufelräder bekannt, die durch eine gebogene oder gekrümmte Schaufelform in der damit definierten Hauptdrehrichtung einen erhöhten Volumenstrom fördern können und damit entsprechend leistungsfähiger sind.There are also known paddle wheels, which can promote an increased volume flow through a curved or curved blade shape in the main direction of rotation defined therewith and thus are correspondingly more efficient.
Aus der
Aus dem
Allerdings gibt es viele Anwendungsfälle, in denen auch in der der Hauptdrehrichtung entgegengesetzten Nebendrehrichtung ein zumindest annähernd gleicher Volumenstrom erforderlich bzw. gewünscht ist. Dies ist insbesondere dann der Fall, wenn das Schaufelrad beispielsweise in einem Wäschetrockner Verwendung findet, bei dem der Antrieb des Schaufelrades mit der Drehrichtung der Wäschetrommel gekoppelt ist. Da diese Haushaltsgeräte üblicherweise im sog. Reversierbetrieb arbeiten, d. h. die Trommeldrehrichtung alternierend wechselt, sind die Schaufelräder der letztgenannten Art in diesen Anwendungsfällen nicht optimal. Beispielsweise bei Waschtrocknern muss dann aus Sicherheitsgründen, z.B. wegen drohender Überhitzung des Prozessluftstroms bzw. des Kältekreislaufs, in der Nebendrehrichtung entweder die Heizleistung und damit die Trocknereffizienz reduziert werden oder bei energierückgewinnenden Wäschepflegetrocknern der Kompressor der Wärmepumpe kurzzeitig ausgeschaltet werden. Dies führt zu unerwünscht längeren Wäschebehandlungs- bzw. Trocknungszeiten und einem erhöhten Energieverbrauch.However, there are many applications in which an at least approximately the same volume flow is required or desired even in the direction opposite to the main direction of rotation. This is the case in particular when the paddle wheel is used, for example, in a tumble dryer in which the drive of the paddle wheel is coupled to the direction of rotation of the laundry drum. Since these household appliances usually work in the so-called. Reversierbetrieb, d. H. the drum rotation alternately changes, the paddle wheels of the latter type are not optimal in these applications. For example, in the case of washer-dryers, for safety reasons, e.g. due to impending overheating of the process air flow or the refrigeration cycle, in the secondary direction either the heating power and thus the drying efficiency can be reduced or the compressor of the heat pump are temporarily switched off in energy-recovering laundry need dryers. This leads to undesirably longer Wäschebehandlungs- or drying times and increased energy consumption.
Vor diesem Hintergrund besteht eine Aufgabe der Erfindung darin, ein Schaufelrad für eine Fluidfördereinrichtung und ein Haushaltsgerät mit einer Fluidfördereinrichtung anzugeben, das sich durch eine erhöhte Fördereffizienz, insbesondere bei einem Förderbetrieb in alternierenden Förderrichtungen, auszeichnet.Against this background, an object of the invention is to provide a paddle wheel for a fluid delivery device and a household appliance with a fluid conveying device, which is characterized by an increased conveying efficiency, in particular in a conveying operation in alternating conveying directions.
Diese Aufgabe wird erfindungsgemäß gelöst durch ein Schaufelrad und durch ein Haushaltsgerät mit den Merkmalen des jeweiligen unabhängigen Patentanspruchs. Bevorzugte Ausführungsformen der Erfindung sind Gegenstände entsprechender abhängiger Patentansprüche, wobei bevorzugten Ausführungsformen des Schaufelrades bevorzugte Ausführungsformen des Haushaltsgeräts entsprechen und umgekehrt, und dies auch dann, wenn darauf hierin nicht explizit hingewiesen ist.This object is achieved by a paddle wheel and by a household appliance with the features of the respective independent claim. Preferred embodiments of the invention are subject matters of corresponding dependent claims, wherein preferred embodiments of the paddle wheel correspond to preferred embodiments of the household appliance and vice versa, and this even if it is not explicitly indicated herein.
Erfindungsgemäß sind demnach die über einen Radumfang des Schaufelrades verteilten Schaufeln mit jeweils zu einer zugehörigen Schaufelspitze hin zulaufenden Schaufelwänden aus einem elastischen Material gefertigt, das bei betriebsgemäßer Belastung bzw. Druckbeaufschlagung eine elastische Verformung (Krümmung) der Schaufel ermöglicht. Um diese Krümmung strömungstechnisch optimiert und damit zur erheblichen Steigerung des Fördervermögens zu gestalten, sind die einander zugewandten Innenseiten der Schaufelwände jeweils mit mindestens einem kraftübertragenden Element (Verbindungssteg) verbunden. Dieser Verbindungssteg ist derart ausgerichtet und angelenkt, dass sich die elastischen Schaufelwände bei betriebsgemäßer Druckbeaufschlagung einer ihrer Außenseiten durch den Verbindungssteg kraftgekoppelt so bewegen, dass sich eine (gegebenenfalls zunehmende) Krümmung des Schaufelprofils zur Seite der Belastung bzw. Druckbeaufschlagung hin einstellt.According to the invention, therefore, the blades distributed over a wheel circumference of the blade wheel are each provided with blade walls tapering towards an associated blade tip made of elastic material that allows for correct operation or pressurization elastic deformation (curvature) of the blade. In order to aerodynamically optimize this curvature and thus to considerably increase the conveying capacity, the mutually facing inner sides of the blade walls are each connected to at least one force-transmitting element (connecting web). This connecting web is aligned and hinged so that the elastic blade walls under normal operation pressurization of one of its outer sides through the connecting web move so that adjusts a (possibly increasing) curvature of the blade profile to the side of the load or pressurization out.
Die Schaufeln des erfindungsgemäßen Schaufelrades zeigen damit ein Verhalten, das dem sog. "Fin Ray (Flossen-Strahl)-Effekt" entspricht. Dieses grundsätzlich aus der Bionik bekannte Prinzip hat bisher in der Technik Anwendungen gefunden, bei denen es um die möglichst optimierte Anpassung eines Körpers oder einer Begrenzungswand an einen anderen Körper - wie beispielsweise der Aufsitzfläche eines Schleppliftes an die Körperkonturen des Benutzers (
Mit der erfindungsgemäßen Ausgestaltung eines Schaufelrades ist dagegen eine betriebsangepasste Optimierung der Schaufelform sowohl hinsichtlich stufenweiser oder kontinuierlich zunehmender Belastung als auch insbesondere bei einer Drehrichtungsumkehr des Schaufelrades realisiert. Mit anderen Worten: Hier ist ein an die spezifische Belastung und insbesondere an die alternierende Drehrichtung bzw. Förderrichtung des Fluids angepasste optimierte Schaufelform realisiert. In beiden Drehrichtungen ist damit eine äußerst leistungsstarke Schaufelradgestalt sichergestellt, die zu einem deutlich verminderten Energieverbrauch führt und die eine geringere Dimensionierung des Schaufelradantriebs erlaubt. Beispielsweise beim Einsatz in einem Wäschetrockner können damit die Behandlungszeiten deutlich verringert werden. Diese Aspekte erlangen im Zeitalter der "Green Technologie" nicht zuletzt auch für das Marketing zunehmende Bedeutung.By contrast, with the embodiment of a paddle wheel according to the invention, an operationally adapted optimization of the blade shape is realized both with respect to stepwise or continuously increasing load and in particular when the direction of rotation of the paddle wheel is reversed. In other words, here an optimized blade shape adapted to the specific load and in particular to the alternating direction of rotation or conveying direction of the fluid is realized. In both directions of rotation thus an extremely powerful Schaufelradgestalt is ensured, which leads to a significantly reduced energy consumption and allows a smaller dimensioning of the Schaufelradantriebs. For example, when used in a tumble dryer treatment times can be significantly reduced. In the age of "green technology", these aspects are becoming increasingly important for marketing as well.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus der beigefügten Zeichnung sowie aus den Unteransprüchen, deren Merkmale einzeln und in beliebiger Kombination miteinander angewendet werden können.Advantageous embodiments of the invention will become apparent from the following description and from the accompanying drawings and from the subclaims, the features of which can be used individually and in any combination with each other.
Nach einer bevorzugten Ausgestaltung der Erfindung ist der mindestens eine Verbindungssteg in seiner Elastizität so bemessen, dass er bei einer betriebsgemäßen Druckbeaufschlagung elastisch in Form eines Knickstabs ausweicht. Diese Ausgestaltung erlaubt eine besonders kontinuierliche Formoptimierung des Schaufelprofils und eine besonders materialschonende und zuverlässige Rückkehr der Schaufel in ihre Ausgangsgeometrie, wenn die Druckbeaufschlagung nachlässt oder endet.According to a preferred embodiment of the invention, the at least one connecting web is dimensioned in its elasticity so that it escapes elastically in the form of a buckling bar in a pressurized operation. This embodiment allows a particularly continuous shape optimization of the blade profile and a particularly material-friendly and reliable return of the blade in its initial geometry when the pressurization decreases or ends.
Nach einer vorteilhaften Fortbildung der Erfindung ist der mindestens eine Verbindungssteg mit seinen Enden über je mindestens ein Filmscharnier mit der jeweiligen Innenseite drehbeweglich verbunden. Diese Ausgestaltung der Erfindung zeichnet sich durch eine besonders einfach zu fertigende Verbindung des Verbindungssteges mit der jeweiligen Innenseite aus und verleiht der Schaufel bei nur einem Freiheitsgrad in der Bewegung des Verbindungssteges eine besonders hohe Stabilität.According to an advantageous development of the invention, the at least one connecting web is rotatably connected with its ends via at least one film hinge with the respective inner side. This embodiment of the invention is characterized by a particularly easy to manufacture connection of the connecting web with the respective inner side and gives the blade with only one degree of freedom in the movement of the connecting web a particularly high stability.
Aufgrund der so realisierten Hohlkonstruktion der Schaufel kann diese und damit das Schaufelrad besonders gewichtsarm realisiert werden, wodurch die Fliehkräfte und die zu beschleunigenden Massen des Schaufelrades unter Verminderung des Verschleißes und des Energiebedarfs reduziert sind.Due to the thus realized hollow construction of the blade, this and thus the paddle wheel can be realized with particularly low weight, whereby the centrifugal forces and the masses of the paddle wheel to be accelerated are reduced while reducing the wear and the energy requirement.
Nach einer in diesem Zusammenhang besonders vorteilhaften weiteren Ausgestaltung der Erfindung sind die Schaufelwände und der mindestens eine Verbindungssteg einstückig aus einem Kunststoff gefertigt.After a particularly advantageous embodiment of the invention in this context, the blade walls and the at least one connecting web are made in one piece from a plastic.
Um eine besonders belastungsdosierte und vorherbestimmte Formänderung und Formoptimierung der Schaufel zur weiteren Effizienzsteigerung des erfindungsgemäßen Schaufelrades zu realisieren, ist nach einer vorteilhaften Weiterbildung der Erfindung vorgesehen, dass die einander zugewandten Innenseiten der Schaufelwände einer Schaufel über mehrere Verbindungsstege miteinander verbunden sind.In order to realize a particularly load-metered and predetermined shape change and shape optimization of the blade to further increase the efficiency of the blade wheel according to the invention, according to an advantageous development of the invention, the mutually facing inner sides of the blade walls of a blade are connected to one another via a plurality of connecting webs.
Weiterhin ist erfindungsgemäß ein Haushaltsgerät zur Wäschebehandlung mit einer Fluidfördereinrichtung ausgestattet, die ein Schaufelrad der vorbeschriebenen Art aufweist. Damit lässt sich die Energieeffizienz eines eine derartige Fluidfördereinrichtung umfassenden Haushaltsgeräts weiter steigern. Ein besonders bevorzugter Anwendungsfall ist ein Haushaltsgerät in Form eines Wäschetrockners, bei dem das erfindungsgemäße Schaufelrad zum Fördern eines Prozessluftstroms und/oder eines Kühlluftstroms dient. Die eingangs im Zusammenhang mit dem Stand der Technik beschriebenen Restriktionen bei einem im Reversierbetrieb betriebenen Wäschetrockner sind mit dem erfindungsgemäßen Schaufelrad vermieden.Furthermore, according to the invention, a domestic appliance for laundry treatment is equipped with a fluid conveying device which has a paddle wheel of the type described above. This can further increase the energy efficiency of a household appliance comprising such a fluid conveying device. A particularly preferred application is a household appliance in the form of a tumble dryer, in which the paddle wheel according to the invention serves to convey a process air stream and / or a cooling air stream. The restrictions described above in connection with the prior art in a tumble dryer operated in reversing operation are avoided with the blade wheel according to the invention.
Die Erfindung ist nachfolgend anhand eines in der beigefügten Zeichnung figürlich dargestellten Ausführungsbeispiels weiter erläutert. Es zeigen:
-
Fig. 1 : eine Fluidfördereinrichtung mit einem Schaufelrad und -
Fig. 2 : eine einzelne Schaufel des Schaufelrades nach in Querschnitt.Figur 1
-
Fig. 1 a fluid conveyor with a paddle wheel and -
Fig. 2 : a single scoop of the paddle wheel behindFIG. 1 in cross section.
Das Schaufelrad 8 enthält mehrere, über seinen Umfang 9 gleichmäßig verteilte Schaufeln, von denen in der Ansicht nach
Wie die stellvertretend in
Wie in
Sobald allerdings der Strömungsdruck 31 nachlässt bzw. verschwindet, bewegt sich die Schaufelspitze 14a in entgegengesetzter Richtung bis schließlich in ihre Ausgangsposition zurück, indem sich die elastische Krümmung der Schaufelwände zurückbildet und dieser Vorgang durch die kraftübertragenden Verbindungsstege, die ebenfalls elastisch in ihre Ursprungsform zurückkehren, unterstützt wird. Der Vorteil ist dabei, dass sich der Grad der Krümmung und damit die Profilanpassung der Schaufel optimal auf die jeweilige Belastungssituation einstellen lässt. Dazu können insbesondere die Materialwahl, die Anordnung und die Dimensionierung der Verbindungsstege dienen. Bei einer Drehrichtungsumkehr in die der Drehrichtung 30 entgegengesetzte Richtung würde die Bewegung und Verformung der Schaufel 14 in entgegengesetzter, spiegelsymmetrischer Weise erfolgen.However, once the
- 11
- FluidfördereinrichtungFluid delivery device
- 22
- ProzessluftstromProcess air flow
- 33
- Wäschetrocknerclothes dryer
- 44
- Elektromotorelectric motor
- 55
- Keilriemenfan belt
- 66
- Keilriemenscheibepulley
- 77
- Achseaxis
- 88th
- Schaufelradpaddle wheel
- 99
- Umfangscope
- 14, 1514, 15
- Schaufelshovel
- 14a, 15a14a, 15a
- Fußbereichfooter
- 14b, 15b14b, 15b
- Schaufelspitzeblade tip
- 1818
- Schaufelradnabeimpeller hub
- 20, 2120, 21
- Schaufelwändeblade walls
- 20a, 21a20a, 21a
- Innenseiteinside
- 20b, 21b20b, 21b
- Außenseiteoutside
- 2323
- Winkelangle
- 24, 2524, 25
- Verbindungsstegeconnecting webs
- 2626
- Verbindungsstegconnecting web
- 24a, 24b24a, 24b
- Endenend up
- 28, 2928, 29
- Filmscharnierfilm hinge
- 3030
- Pfeilarrow
- 3131
- Strömungsdruckflow pressure
- 3232
- Druckbeaufschlagungpressurization
- 3333
- Seitepage
Claims (7)
- Paddle wheel (8) for a fluid delivery device (1),- having a plurality of paddles (14, 15) which are distributed over a circumference (9) of the paddle wheel and which each have paddle walls (20, 21) which taper in the direction of an associated paddle tip (14b, 15b), characterised in that- at least one force-transmitting connecting web (24, 25, 26) is connected in an articulated manner to the mutually facing inner faces (20a, 21a) of the paddle walls (20, 21) and wherein the elasticity of the paddle walls (20, 21) is dimensioned such that, when pressure is applied (32) to an outer face (20b) of a paddle wall (20b, 21b) during operation, the paddle tip (14b, 15b) moves in the direction of the side (33) on which pressure is applied (32), with elastic bending of the paddles (14, 15).
- Paddle wheel according to claim 1,- wherein the at least one connecting web (24, 25, 26) is dimensioned in its elasticity such that when pressure is applied (32) during operation it elastically deflects in the form of an articulated rod.
- Paddle wheel according to claim 1 or 2,- wherein the at least one connecting web (24, 25, 26) is rotatably connected by its ends (24a, 24b) by way of at least one film hinge (28, 29) in each case to the respective inner face (20a, 21a).
- Paddle wheel according to at least one of claims 1, 2 or 3,- wherein the paddle walls (20, 21) and the at least one connecting web (24, 25, 26) are manufactured in one piece from a plastic.
- Paddle wheel according to at least one of the preceding claims,- wherein the mutually facing inner faces (20a, 21a) of the paddle walls (20, 21) of a paddle (14, 15) are interconnected by way of a plurality of connecting webs (24, 25, 26).
- Domestic appliance for treating laundry,- having a fluid delivery device (1) containing a paddle wheel (8) according to at least one of the preceding claims.
- Domestic appliance according to claim 6,
which is a tumble dryer, in which the paddle wheel (8) is used for delivering a process air flow and/or a cooling air flow.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12751042T PL2748467T3 (en) | 2011-08-22 | 2012-08-13 | Paddle wheel for a fluid delivery device, and domestic appliance having a paddle wheel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081333A DE102011081333A1 (en) | 2011-08-22 | 2011-08-22 | Paddle wheel for a fluid conveying device and household appliance with such |
PCT/EP2012/065823 WO2013026733A2 (en) | 2011-08-22 | 2012-08-13 | Paddle wheel for a fluid delivery device, and domestic appliance having a paddle wheel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2748467A2 EP2748467A2 (en) | 2014-07-02 |
EP2748467B1 true EP2748467B1 (en) | 2015-10-14 |
Family
ID=46750311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12751042.8A Active EP2748467B1 (en) | 2011-08-22 | 2012-08-13 | Paddle wheel for a fluid delivery device, and domestic appliance having a paddle wheel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2748467B1 (en) |
DE (1) | DE102011081333A1 (en) |
PL (1) | PL2748467T3 (en) |
WO (1) | WO2013026733A2 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB352507A (en) * | 1930-04-10 | 1931-07-10 | Franz Melcher | Improvements in and relating to screw propellers with flexible blades |
US3042371A (en) * | 1958-09-04 | 1962-07-03 | United Aircraft Corp | Variable camber balding |
DE1115585B (en) * | 1958-10-04 | 1961-10-19 | Siemens Ag | Impeller for self-priming centrifugal pumps, especially side channel pumps |
US4706928A (en) * | 1985-06-10 | 1987-11-17 | Baker International Corporation | Vane cone assembly for use in making centrifugal elastomeric coated impellers |
DE19537944A1 (en) | 1995-10-12 | 1997-04-17 | Aeg Hausgeraete Gmbh | Discharge pump for washing machines etc. |
DE19916411A1 (en) * | 1999-04-01 | 2000-11-16 | Leif Kniese | Dynamic lever to improve power transmission |
DE102006045615B3 (en) | 2006-09-25 | 2007-10-11 | Carl Freudenberg Kg | Mop wringing system comprises basket-shaped wringer mounted on bucket, into which mop head is pushed to wring it out, basket being made up of inner and outer strips connected at top and with spacers at base connected to them by film hinges |
ATE556224T1 (en) * | 2008-07-10 | 2012-05-15 | Grundfos Management As | PUMP |
DE102008054998B3 (en) | 2008-12-19 | 2010-06-17 | BSH Bosch und Siemens Hausgeräte GmbH | Front loading washing machine, has guiding device arranged before drain pump, hollow cylindrical part comprising two ends, inner upper surface and external upper surface, and vane arranged on external upper surface |
DE202009010377U1 (en) | 2009-07-31 | 2009-12-17 | Cermak, Markus | Alpine transport element |
-
2011
- 2011-08-22 DE DE102011081333A patent/DE102011081333A1/en not_active Withdrawn
-
2012
- 2012-08-13 EP EP12751042.8A patent/EP2748467B1/en active Active
- 2012-08-13 PL PL12751042T patent/PL2748467T3/en unknown
- 2012-08-13 WO PCT/EP2012/065823 patent/WO2013026733A2/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2013026733A3 (en) | 2013-09-26 |
PL2748467T3 (en) | 2016-03-31 |
DE102011081333A1 (en) | 2013-02-28 |
WO2013026733A2 (en) | 2013-02-28 |
EP2748467A2 (en) | 2014-07-02 |
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