(19)
(11)EP 2 340 356 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.08.2016 Bulletin 2016/33

(21)Application number: 09740739.9

(22)Date of filing:  23.09.2009
(51)Int. Cl.: 
F01C 1/36  (2006.01)
(86)International application number:
PCT/IB2009/006809
(87)International publication number:
WO 2010/035097 (01.04.2010 Gazette  2010/13)

(54)

FLUID-POWERED MOTORS AND PUMPS

FLUIDGETRIEBENE MOTOREN UND PUMPEN

MOTEURS ET POMPES À ÉNERGIE HYDRAULIQUE


(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(30)Priority: 23.09.2008 US 192927 P

(43)Date of publication of application:
06.07.2011 Bulletin 2011/27

(73)Proprietor: Zodiac Pool Systems, Inc.
Vista, CA 92081 (US)

(72)Inventors:
  • VAN DER MEIJDEN, Hendrikus Johannes
    Glen Austin Midrand (ZA)
  • MOORE, Michael Edward
    Westdene Johannesburg 2092 (ZA)

(74)Representative: Ipside 
6, Impasse Michel Labrousse
31100 Toulouse
31100 Toulouse (FR)


(56)References cited: : 
FR-A1- 2 870 883
US-A- 2 557 427
US-A- 5 156 541
US-B1- 6 292 970
GB-A- 341 013
US-A- 2 584 582
US-A1- 2004 261 757
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    REFERENCE TO PROVISIONAL APPLICATION



    [0001] This application is based on, claims priority to, and hereby refers to U.S. Provisional Patent Application Serial No. 61/192,927, filed September 23, 2008, entitled "Fluid Powered Motor and Pump".

    FIELD OF THE INVENTION



    [0002] This invention relates to fluid-powered motors and pumps and more particularly, but not necessarily exclusively, to motors and pumps powered by (or powering) liquids such as water. The motors and pumps may be especially useful in connection with filtration systems for pools and spas, although they may be used in other ways as well.

    BACKGROUND OF THE INVENTION



    [0003] U.S. Patent No. 4,449,265 to Hoy illustrates an example of a wheeled automatic swimming pool cleaner. Powering the wheels is an impeller comprising an impeller member and pairs of vanes. Evacuating the impeller causes water within a swimming pool to interact with the vanes, rotating the impeller member. The impeller is reversible, with the impeller member apparently moving laterally when the pool cleaner reaches an edge of a pool to effect the rotation reversal.

    [0004] U.S. Patent No. 6,292,970 to Rief, et al., describes a turbine-driven automatic pool cleaner. The cleaner includes a turbine housing defining a water-flow chamber in which a rotor is positioned. Also included are a series of vanes pivotally connected to the rotor. Water interacting with the vanes rotates the rotor in one direction (clockwise as illustrated in the Rief patent), with the vanes pivoting when encountering "debris of substantial size" to allow the debris to pass through the housing for collection. The contents of the Hoy and Rief patents are incorporated herein in their entireties by this reference.

    [0005] U.S Patent No. 5,156,541 illustrates a revolving vane pump-motor-meter with a troidal working chamber and paddles rotating about two orthogonal axes.

    SUMMARY OF THE INVENTION



    [0006] The present invention provides efficient alternatives to conventional impellers and turbines. The invention also may be activated as a pump and, if desired, may switch between motor and pump functions dynamically. It has especial usefulness as a motor powering an automatic swimming pool cleaner, although the invention may be utilized in connection with other aspects of a filtration system for a pool or spa or as part of any other system in which conversion of energy from, for example, a suction or pressure source to rotational power is necessary or desired.

    [0007] Currently-preferred versions of the present invention typically comprise a body having at least one inlet and at least one outlet. Within the body are positioned one or more pairs of paddles whose distal edges are locally flexible to facilitate passage of debris. Rather than being placed in the same plane (or otherwise uniformly formed), however, paddles of a pair in the present invention may be positioned perpendicularly. Stated differently, if the paddles themselves are generally planar and one paddle of a pair exists in a first plane, the other paddle of the pair may exist in a second plane normal to the first plane. In other versions these paddles of a pair need not necessarily be perpendicular to each other, although some angular difference between orientations of paddles of a pair may be beneficial. In yet other versions, paddles need not necessarily be paired, although again having angular differences between orientations of various paddles may be advantageous.

    [0008] In at least one version of the invention having paired paddles, a first pair of paddles is connected by a shaft. The paddles additionally are connected, via hinges, bearings, or other connection means, to a base. The base is configured to allow some rotation of the paddles about an axis aligned with at least part of the shaft, with the base and connection means also functioning to limit rotation of the paddles in some, but not all, versions of the invention. Preferably, the paddles may rotate through an angle of ninety degrees about this axis, although other angular rotations may occur instead.

    [0009] At least this embodiment further includes a second pair of paddles likewise connected by a shaft and to a base. Each of the two shafts beneficially may be non-linear, allowing the shafts to cross without interfering with paddle rotation yet permitting portions of each shaft to remain in the same plane. Moreover, the two bases may be configured to fit together, forming a unitary structure housing at least parts of both shafts. Either or both bases may include an outwardly-extending shaft that provides (1) rotational output when the invention is used as a motor and (2) rotational input when the invention is used as a pump.

    [0010] Bodies consistent with the invention may be hollow (or have hollow portions) into which the paddles and bases are fitted. The unitary structure including the paddles and bases may rotate about the outwardly-extending shaft (or shafts) a full three hundred sixty degrees (i.e. in paddle-wheel fashion) either clockwise or counterclockwise as desired. Consequently, paddles of the present invention may rotate about two different axes in operation, although they preferably do not move linearly--unlike the impeller member of the Hoy patent.

    [0011] The bodies also may be configured to present flow restrictions. Such a restriction may, when contacted by a paddle, cause the paddle to rotate so that its faces are parallel (or generally parallel) to the fluid direction through the body. This rotation in turn causes the paired paddle to rotate so that its faces are perpendicular to the flow direction. The result is one paddle of a pair presenting minimum surface area to the flow direction while the other provides maximum surface are to the flow direction, allowing the suction or pressure force to work with greatest efficiency in rotating the unitary structure to supply high-torque output.

    [0012] Stated differently, the present invention uses predominantly surface-area differentials to cause rotary motion. The fluid-flow pressure encountered by both paddles of a pair is the same (or approximately so); one paddle merely presents a larger surface area to the fluid flow than does the other paddle. This concept differs significantly from that of standard impellers, which jet fluid at one side of an impeller to cause a pressure differential on sides of the blades, thus creating rotation to relieve the imbalance.

    [0013] Moreover, in standard impellers, a blade opposite the one being impacted by the jetted fluid is moving fluid in a direction opposite the flow. In this sense, it is "dragging dead fluid" along, reducing the overall efficiency of the device. By contrast, no material level of such "dragging" occurs in connection with the present invention.

    [0014] It thus is an optional, non-exclusive object of the present invention to provide fluid-powered devices that may be employed as motors or pumps (or both).

    [0015] It is another optional, non-exclusive object of the present invention to provide fluid-powered devices using, predominantly or exclusively, surface-area differentials to cause rotary motion.

    [0016] It is a further optional, non-exclusive object of the present invention to provide fluid-powered devices utilizing at least one pair of paddles, with each paddle of a pair being non-planar, or otherwise non-uniformly oriented, with the other paddle of the pair.

    [0017] It is, moreover, an optional, non-exclusive object of the present invention to provide paddles configured to rotate about multiple axes.

    [0018] It is also an optional, non-exclusive object of the present invention to provide fluid-powered devices having a pair of paddles connected via a non-linear shaft.

    [0019] It is an additional optional, non-exclusive object of the present invention to provide fluid-powered devices especially useful in connection with automatic swimming pool cleaners or other equipment used as part of filtration systems of pools, spas, or hot tubs.

    [0020] Other objects, features, and advantages of the present invention will be apparent to those skilled in appropriate fields with reference to the remaining text and the drawings of this application.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0021] 

    FIG. 1 is a first exterior plan view of an exemplary device consistent with the present invention.

    FIG. 2 is a second exterior plan view of the device of FIG. 1.

    FIG. 3 is a first perspective view of portions of the device of FIG. 1, including two pairs of paddles and a flow restrictor depicted within a body.

    FIG. 4 is a second perspective view of portions of the device of FIG. 1, including the pairs of paddles of FIG. 3.

    FIG. 5 is a perspective view of the pairs of paddles of FIG. 3.


    DETAILED DESCRIPTION



    [0022] Depicted in FIGS. 1-2 is exemplary device 10. Device 10 may function as a motor or pump or as any other device configured to convert energy from a suction or pressure source to rotational movement. Device 10 may include body 14 defining inlet 18 and outlet 22 as well as outwardly-extending shafts 26. Although two such outwardly-extending shafts 26 are illustrated in FIGS. 1-2, more or fewer shafts 26 may be utilized instead. Likewise, although shafts 26 are shown in FIGS. 1-2 as being elongated rods, they may be configured or shaped differently than as shown.

    [0023] Body 14 may, if desired, comprise at least first and second portions 30 and 34. If so, first and second portions 30 and 34 preferably are connected in use, as illustrated in FIGS. 1-2. At least part of body 14 additionally preferably (although not necessarily) is symmetric about both (1) the connection between first and second portions 30 and 34 and (2) an axis coincident with shafts 26. Fluid flow through body 14 may occur from inlet 18 to outlet 22 or from outlet 22 to inlet 18. Hence, the terms "inlet" and "outlet" of body 14 are used herein for convenience, as the "inlet" may at times be the outlet of body 14 and the "outlet" may at these times be the inlet of body 14.

    [0024] Also depicted in FIGS. 1-2 as being within body 14 is an exemplary blade, vane, or paddle 38 as well as restriction 42 and hubs or bases 46A and 46B. Paddle 38, together with one or more similar paddles, may be connected directly or indirectly to outwardly-extending shafts 26. When device 10 is employed as a motor, fluid flowing through body 14 interacts with each paddle 38 to produce rotation of shafts 26.

    [0025] FIGS. 3-5 depict multiple paddles 38. FIG. 5, in particular, illustrates that paddles 38 may, if desired, be paired; two such pairs are shown in the figure, with one pair comprising paddles 38A and 38B and the other pair comprising paddles 38C and 38D. In presently-preferred versions of device 10, paddles 38A and 38B are connected by shaft 50A and paddles 38C and 38D are connected by shaft 50B. Preferably no direct connection exists between paddles 38A and 38B, on the one hand, and paddles 38C and 38D, on the other hand. Instead, shafts 50A and 50B are configured to cross in a manner avoiding interference by shaft 50A with rotation of paddles 38C and 38D and by shaft 50B with rotation of paddles 38A and 38B. Although device 10 preferably includes four paddles 38 (e.g. paddles 38A, 38B, 38C, and 38D), more or fewer paddles 38 may be used.

    [0026] In a version of paddles 38 depicted in FIGS. 3-5, shaft 50A resembles an elongated cylinder and thus may define a generally longitudinal axis X. Shaft 50B is similar, defining a generally longitudinal axis Y. Central portion 54A of shaft 50A, however, deviates from axis X, essentially being shifted laterally from the axis X to form nesting space 58A. Likewise, central portion 54B of shaft 50B is translated from axis Y to form nesting space 58B. Shaft 50A thus may be placed generally in the same plane as shaft 50B, with nesting spaces 58A and 58B being adjacent. In the version shown in FIG. 5, central portion 54A is atop central portion 54B but not in contact therewith because of the alignment of nesting spaces 58A and 58B.

    [0027] FIG. 5 additionally illustrates a preferred relative orientation of paddles 38 of a pair. Paddle 38A, for example, is shown in FIG. 5 as having a principal face 62 (together with its opposite face, which is not shown) generally in the plane of the page. By contrast, paddle 38B is depicted as having its principal and opposite face 66 (as well as its unshown opposite face) generally normal to the plane of the page. Stated differently, a plane containing principal face 62 and passing through axis X preferably is perpendicular to a plane containing principal face 66 and passing through axis X, so that principal faces 62 and 66 are offset by ninety degrees. Accordingly, when principal face 62 presents maximum surface area to the flow direction through body 14, principal face 66 will present minimum surface area to the flow direction. Relative orientation of paddles 38C and 38D preferably is similar; a plane containing principal face 70 of paddle 38D passing through axis Y may be perpendicular to a plane containing principal and opposite faces 74 and 78, respectively, of paddle 38C passing through the axis Y.

    [0028] Although relative faces of pairs of paddles 38 preferably are offset by ninety degrees, this exact angular orientation is not mandatory. Angular offset should be greater than zero for paddles 38 of a pair; thus the invention contemplates any other such offset. Nevertheless, offsets greater than, for example, five, twenty, or forty-five degrees may be necessary to produce satisfactory results in many cases. Because preferred versions of shafts 50A and 50B and faces 62, 66, 70, 74, and 78 (etc.) are inflexible, paddles 38A and 38B will retain their angular offset at all times, while paddles 38C and 38D likewise will retain their angular offset at all timers. Paddle edges (such as edge 82 of paddle 38A) are flexible to facilitate passage of debris through body 14 or reduce frictional wear of paddles 38 (or of body 14).

    [0029] Shafts 50A and 50B, together with bearings-containing wheels 86, may be placed in base 46B as illustrated in FIG. 3. Base 46A (FIG. 4) may be fitted over wheels 86 and attached to base 46A. The resulting structure permits shafts 50A and 50B and associated paddles 38A-D to rotate about axis Z coincident with shafts 26. When device 10 functions as a motor, rotation about axis Z occurs because of fluid flow through body 14; if fluid enters via inlet 18, rotation will be in the direction of arrow A (see FIG. 3). Conversely, if fluid enters via outlet 22, rotation will be in the opposite direction, as shown by arrow B. (Alternatively, restriction 42 may be repositioned appropriately within body 14 to reverse rotational direction without changing whether fluid enters via inlet 18 or outlet 22.) Because shafts 26 are connected to the rotating components, they too will rotate, providing power available to perform useful work.

    [0030] In use, paddles 38 rotate about another axis as well. Paddles 38A-B, for example, may rotate about axis X, while paddles 38C-D may rotate about axis Y. This second type of rotation is caused by restrictor 42.

    [0031] Assume, for example, that paddles 38A-D are configured and oriented as shown in FIG. 3 and rotating in the direction of arrow A. Paddle 38C is generally vertical in this example as it approaches restrictor 42, which is shown as being in the form of a ramp. Further movement in the direction of arrow A causes face 78 of paddle 38C to contact restrictor 42, whose sloping surface 90 (see also FIG. 2) forces paddle 38C to rotate about axis Y so as to reorient generally horizontally (with its face 74 ultimately facing upward like face 62 in FIG. 3). As paddle 38C rotates from a generally vertical position to a generally horizontal one, paired paddle 38D will rotate from a generally horizontal position to a generally vertical one. Indeed, this relationship is illustrated in FIG. 3 by paired paddles 38A and 38B: Paddle 38A has already been forced by restrictor 42 into a generally horizontal orientation, causing paired paddle 38B to assume a generally vertical orientation.

    [0032] Continuing this example consistent with FIG. 3, fluid entering inlet 18 may travel to outlet 22 via either side of base 46B--i.e. through both channel 94 and channel 98. (Preferably, however, channel 98 is substantially more restricted than channel 94, so that only limited flow occurs therethrough.) The fluid entering inlet 18 initially encounters paddle 38D. Because paddle 38D is generally horizontal, it presents minimal surface area to the direction of fluid flow from inlet 18 to outlet 22. This result additionally is true for paddle 38A, having been forced to the horizontal position by restriction 42 (and in effect sealing, or substantially sealing, channel 98). By contrast, paddle 38B is generally vertical, presenting maximum surface area (in the form of face 66, which is not shown in FIG. 3 but is depicted in FIG. 5) to the fluid flow direction. This differential surface area causes the flowing fluid to push on paddle 38B, resulting in paddle rotation in the direction of arrow A.

    [0033] Although not illustrated in FIG. 3, restrictor 42 may continue throughout channel 98 or otherwise have a sloping surface adjacent inlet 18, so that device 10 may be operated in reverse. Further, if power is supplied to rotate one or more shafts 26, the shafts 26 in turn may rotate paddles 38 about axis Z so that device 10 may function as a fluid pump, in this sense being fluid "powered" in its operation regardless of how shafts 26 are caused to rotate. As a consequence, device 10 provides a versatile, efficient mechanism for using flowing fluid to create rotation.

    [0034] The foregoing is provided for purposes of illustrating, explaining, and describing embodiments of the present invention. Modifications and adaptations to these embodiments will be apparent to those skilled in the art and may be made without departing from the scope of the invention.


    Claims

    1. A device (10) comprising:

    a. a body (14) having an inlet (18) and an outlet (22) and a water flow region between the inlet and the outlet configured so that water flows in a direction from the inlet to the outlet;

    b. first paddle (38A) positioned at least partly within the body (14) and configured for rotation about first (X) and second (Z) axes; and

    c. second paddle (38B) positioned at least partly within the body and configured for rotation about the first and second axes so that when the first paddle rotates about the first axis to present substantially maximum surface area to the water flow direction, the second paddle rotates about the first axis to present substantially minimum surface area to the flow direction;

    characterised in that each of the first paddle (38A) and the second paddle (38B) has a flexible edge.
     
    2. A device (10) according to claim 1 in which the first (38A) and second (38B) paddles are connected by a first shaft (50A) defining the first axis.
     
    3. A device (10) according to claim 2 in which the first (38A) and second (38B) paddles are connected to a shaft (26) (i) extending outwardly from the body and (ii) coincident with the second axis (Z).
     
    4. A device (10) according to claim 3 further comprising third (38C) and fourth (38D) paddles.
     
    5. A device (10) according to claim 4 in which the third (38C) and fourth (38D) paddles are connected by a second shaft (50B) defining a generally longitudinal axis (Y), the third (38C) and fourth (38D) paddles being configured to rotate about the generally longitudinal axis (Y) of the second shaft (50B).
     
    6. A device (10) according to claim 5 in which the third (38C) and fourth (38D) paddles are configured to rotate also about the second axis (Z).
     
    7. A device (10) according to claim 6 further comprising (i) a body (14) and (ii) a restriction (42) positioned at least partly within the body (14) and configured to contact at least the first paddle (38A) and cause it to rotate about the first axis (X).
     
    8. A device (10) according to claim 5 in which the first shaft (50A) comprises a central portion (54A) translated from the first axis (X) to form a nesting space (58A) and the second shaft (50B) comprises a central portion (54B) translated from the generally longitudinal axis (Y) to form a nesting space (58B).
     
    9. A device (10) according to claim 1 in which the first (38A) and second (38B) paddles are connected via a non-linear shaft.
     
    10. A device (10) according to claim 1 in which the device is a motor.
     
    11. A device (10) according to claim 1 in which the device is a pump.
     
    12. An automatic swimming pool cleaner comprising the device (10) of claim 1.
     


    Ansprüche

    1. Vorrichtung (10), umfassend:

    a. einen Körper (14) mit einem Einlass (18) und einem Auslass (22) und einer Wasserflussregion zwischen dem Einlass und dem Auslass, derart konfiguriert, dass das Wasser in eine Richtung vom Einlass zum Auslass fließt;

    b. ein erstes Paddel (38A), das mindestens teilweise innerhalb des Körpers (14) positioniert und zur Rotation um eine erste (X) und eine zweite (Z) Achse konfiguriert ist; und

    c. ein zweites Paddel (38B), das mindestens teilweise innerhalb des Körpers positioniert und zur Rotation um die erste und die zweite Achse konfiguriert ist, so dass, wenn das erste Paddel um die erste Achse rotiert, um der Wasserflussrichtung einen im Wesentlichen maximalen Oberflächeninhalt zu präsentieren, das zweite Paddel um die erste Achse rotiert, um der Flussrichtung einen im Wesentlichen minimalen Oberflächeninhalt zu präsentieren;

    dadurch gekennzeichnet, dass jedes des ersten Paddels (38A) und des zweiten Paddels (38B) einen flexiblen Rand aufweist.
     
    2. Vorrichtung (10) nach Anspruch 1, wobei das erste (38A) und das zweite (38B) Paddel durch eine erste Welle (50A) verbunden sind, die die erste Achse definiert.
     
    3. Vorrichtung (10) nach Anspruch 2, wobei das erste (38A) und das zweite (38B) Paddel mit einer Welle (26) verbunden sind, die (i) sich vom Körper aus nach außen erstreckt und (ii) mit der zweiten Achse (Z) zusammenfällt.
     
    4. Vorrichtung (10) nach Anspruch 3, ferner umfassend ein drittes (38C) und viertes (38D) Paddel.
     
    5. Vorrichtung (10) nach Anspruch 4, wobei das dritte (38C) und das vierte (38D) Paddel durch eine zweite Welle (50B) verbunden sind, die eine allgemein längsgerichtete Achse (Y) definiert, wobei das dritte (38C) und vierte (38D) Paddel derart konfiguriert sind, dass sie um die allgemein längsgerichtete Achse (Y) der zweiten Welle (50B) rotieren.
     
    6. Vorrichtung (10) nach Anspruch 5, wobei das dritte (38C) und vierte (38D) Paddel derart konfiguriert sind, dass sie auch um die zweite Achse (Z) rotieren.
     
    7. Vorrichtung (10) nach Anspruch 6, ferner umfassend (i) einen Körper (14) und (ii) eine Engstelle (42), die mindestens teilweise innerhalb des Körpers (14) positioniert und konfiguriert ist, um mindestens das erste Paddel (38A) zu kontaktieren und herbeizuführen, dass es um die erste Achse (X) rotiert.
     
    8. Vorrichtung (10) nach Anspruch 5, wobei die erste Welle (50A) einen Mittelabschnitt (54A) umfasst, der von der ersten Achse (X) unter Bildung eines Nistraums (58A) verschoben ist, und die zweite Welle (50B) einen Mittelabschnitt (54B) umfasst, der von der allgemein längsgerichteten Achse (Y) unter Bildung eines Nistraums (58B) verschoben ist.
     
    9. Vorrichtung (10) nach Anspruch 1, wobei das erste (38A) und das zweite (38B) Paddel durch eine nichtlineare Welle verbunden sind.
     
    10. Vorrichtung (10) nach Anspruch 1, wobei die Vorrichtung ein Motor ist.
     
    11. Vorrichtung (10) nach Anspruch 1, wobei die Vorrichtung eine Pumpe ist.
     
    12. Automatischer Schwimmbadreiniger, umfassend die Vorrichtung (10) nach Anspruch 1.
     


    Revendications

    1. Dispositif (10) comprenant :

    a. un corps (14) ayant une entrée (18) et une sortie (22) et une région d'écoulement d'eau entre l'entrée et la sortie, configurée de telle sorte que l'eau s'écoule dans une direction allant de l'entrée à la sortie ;

    b. une première pale (38A) positionnée au moins en partie à l'intérieur du corps (14) et configurée de manière à tourner autour de premier (X) et deuxième (Z) axes ; et

    c. une deuxième pale (38B) positionnée au moins en partie à l'intérieur du corps et configurée de manière à tourner autour des premier et deuxième axes de telle sorte que lorsque la première pale tourne autour du premier axe pour présenter substantiellement une superficie maximale à la direction d'écoulement d'eau, la deuxième pale tourne autour du premier axe pour présenter substantiellement une superficie minimale à la direction d'écoulement ;

    caractérisé en ce que la première pale (38A) et la deuxième pale (38B) présente un bord flexible.
     
    2. Dispositif (10) selon la revendication 1, dans lequel la première (38A) et la deuxième (38B) pale sont connectées par un premier arbre (50A) définissant le premier axe.
     
    3. Dispositif (10) selon la revendication 2, dans lequel la première (38A) et la deuxième (38B) pale sont connectées à un arbre (26) (i) s'étendant vers l'extérieur depuis le corps et (ii) coïncidant avec le deuxième axe (Z).
     
    4. Dispositif (10) selon la revendication 3, comprenant en outre une troisième (38C) et une quatrième (38D) pale.
     
    5. Dispositif (10) selon la revendication 4, dans lequel la troisième (38C) et la quatrième (38D) pale sont connectées par un deuxième arbre (50B) définissant un axe principalement longitudinal (Y), la troisième (38C) et la quatrième (38D) pale étant configurées pour tourner autour de l'axe principalement longitudinal (Y) du deuxième arbre (50B).
     
    6. Dispositif (10) selon la revendication 5, dans lequel la troisième (38C) et la quatrième (38D) pale sont configurées pour tourner également autour du deuxième axe (Z).
     
    7. Dispositif (10) selon la revendication 6, comprenant en outre (i) un corps (14) et (ii) une restriction (42) positionnée en moins en partie à l'intérieur du corps (14) et configurée pour venir en contact avec au moins la première pale (38A) et pour la faire tourner autour du premier axe (X).
     
    8. Dispositif (10) selon la revendication 5, dans lequel le premier arbre (50A) comprend une portion centrale (54A) déplacée en translation depuis le premier axe (X) pour former un espace d'emboîtement (58A) et le deuxième arbre (50B) comprend une portion centrale (54B) déplacée en translation depuis l'axe principalement longitudinal (Y) pour former un espace d'emboîtement (58B).
     
    9. Dispositif (10) selon la revendication 1, dans lequel la première (38A) et la deuxième (38B) pale sont connectées par le biais d'un arbre non linéaire.
     
    10. Dispositif (10) selon la revendication 1, dans lequel le dispositif est un moteur.
     
    11. Dispositif (10) selon la revendication 1, dans lequel le dispositif est une pompe.
     
    12. Dispositif de nettoyage de piscine automatique comprenant le dispositif (10) selon la revendication 1.
     




    Drawing


















    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description