PUMP

Description

[0001] This invention is related to a pump, which has a bearing group with reduced rotor friction resistance.

[0002] Synchronous pumps, which are used for water discharge preferably in the washing machines, must operate on possible low grid voltage and to activate with low energy consumption.

[0003] A rotor bearing group of the centrifugal pump defined in the European Patent No. 0207430, makes noise, especially during the initial start up of the pump and may cause vibrations and locking of the pump.

[0004] In another prior art reference, in EP No. 287984, the connection detail of the pump rotor to the motor is defined in the synchronous pumps. An O-ring, located on a mechanical and cylindrical part, which rotates around the central axis in the coupling housing a viscous liquid, is causing loss of power, due to the friction it creates. Therefore, such pumps are starting up by using high grid voltages. More energy is being consumed due to this reason and the pump may not operate in case the voltage is low.

[0005] A pump according to the preamble of Claim 1 is known from US2002012593 and EP0723329.

[0006] The purpose of this invention is to develop a pump, which has a rotor-bearing group that provides the start up of the operation under low voltage conditions and which provides the reduction of the power losses.

[0007] The pump according to claim 1 realized to attain the object of this invention has been illustrated in the attached drawings, wherein:

Figure 1 - is the schematic view of a pump.

Figure 2 - is the side section view of a coupling.

Figure 3 - is the section view of a seal that has two internal surfaces and one side surface.

[0008] The parts in these figures have been numbered as below:

1.

Pump

2.

Seal

3.

Shaft

4.

Rotor

5.

Coupling

6.

Rotor Washer

7.

Rotor Holder

8.

Recess

9.

Body

10.

Protrusion

11.

Extension

12.

Motor

13.

Pump Body

14.

Rotor Housing

15.

Vane

16.

Side Surface

17.

Internal Surface

18.

Groove

[0009] Pumps which are preferably used in domestic appliances, in dish washing machines and in washmachines, for the purpose of discharging comprise of a motor (12), to provide the operation of the pump, a pump body (13), which covers the motor (12), a shaft (3) which transmits the drive power received from the motor (12) a rotor (4), attached the motor (12), to provide desired liquids to be sucked and pumped by a shaft (3), a coupling (5) to provide the shaft (3) itself to be rotated together with the rotor (4), and a rotor housing (14) which covers the rotor (4) and which directs the liquids to the directions of suction and discharge.

[0010] The rotor (4) includes more than one vane (15), which provide the liquid to be sucked and pumped is filled in and discharged and has a recess (8) to connect the rotor (4) to the shaft (3) in the center part of the vanes (15). The recess (8) has a ladder-like structure having several cylindrical steps of different diameters and having a protrusion (10) in the form of a slice of a circle in the lowest step.

[0011] The shaft (3) is being attached to a recess (8), which has a viscous liquid in itself by a coupling (5). The coupling (5) comprises a rotor washer (6) having a central bore to accommodate the shaft (3) to protect the coupling (5), a seal (2) placed below the rotor washer, having a central bore to accommodate the shaft (3) to prevent the escape of the viscous liquid outside the recess and vice versa, a rotor holder (7) connected to the shaft (3) under the seal preferably in a tight fit fashion, with a central bore to accommodate the shaft (3) to transmit the drive from the shaft to the rotor (4).

[0012] The rotor holder (7) has a cylindrical body (9) to rotate it around its axis inside the recess it is born and includes an extension piece (11) having a form of a circle slice, connected to this body (9) to complete the protrusion (10) in the form of a chord in the recess (8) so that a gap remains in between.

[0013] The extension (11) moves in the gap, without touching the protrusion (10) in order to determine the direction of rotation of the motors in the pumps during start up. The viscous liquid inside the recess (8) prevents noise and vibration during this movement. Hence, locking are also prevented during this phase. The viscous liquid that creates non-friction movement of the rotor holder (7) connected to the shaft, within the recess by providing a sliding surface between the recess (8) and rotor holder (7) facilitates the movement.

[0014] The seal (2) comprises of one or more internal surfaces (17) forming the central hole to accommodate the shaft (3); one or more grooves (18) between said surfaces; one or more side surfaces (16) wider than the internal surface(s) and contacting the whole surface of the recess; one or more grooves between side surfaces (16).

[0015] As the shaft (3) starts to rotate, it tries to rotate the coupling (5) attached to it. The rotor holder (7) which has no barrier that will resist this rotation except the viscous liquid in it, starts rotating before the rotor washer (6) that contacts the side surfaces of the recess (8) and the seal (2) because higher friction forces than the force that drives the shaft (3) is formed on the seal (2) that contacts all surfaces of the rotor washer (6), attached in a tight fit fashion and the recess (8) due to the surface they contact. Since the area of the internal surface (17), through which the shaft (3) passes is smaller than the side surface (16) a lower friction force does not prevent the rotation of the shaft (3) due to internal surface (17), is formed. This friction force on more than one internal surface (17), among which grooves (18) are present may be further lowered.

[0016] The extension (11) rests on the protrusion (10) after the first movement of the rotor holder (7), which is driven by the shaft (3) and this causes the movement of the moves coupling (5), together with the rotor (4) as a single piece.

[0017] In the preferred embodiment of the invention, a side surface (16) and two internal surfaces (17) having a gap there between are used. Thus, since a smaller friction area is formed by two internal surfaces (16), the shaft (3) moves easily inside them and the escape of the viscous liquid in the recess (8) is prevented. By using a side surface (16) in full contact with the recess, the friction surface is increased and movement of the seal gets more difficult.

[0018] Thanks to this invention, the friction in the first movement has been reduced and the operation of the motor (12) by consuming less energy has been provided. As less energy is sufficient, the amount of winding wire used on motor (12) is decreased and use of lower magnetic value magnets can be used. Thus, the present pump (1) provides optimum and economic usage.

Claims

1. A pump used for discharging purposes in domestic appliances, dishwashers or washing machines comprising a motor (12), a pump body (13) to accommodate the motor (12), a shaft (3) to transmit the power produced by the motor (12), a rotor (4) coupled to the shaft (3) by means of a recess (8) having viscous fluid inside, a coupling (5) having a rotor holder (7) having a central bore to accommodate a shaft (3), centrally connected to the shaft (3) in a tight fit fashion and that transmits the drive from the shaft (3) to the rotor (4) in a tight fit fashion, a rotor housing (14) accommodating the rotor (4) and directing it to the direction of the suction and pumping of the fluids, characterized in that a seal (2) provided on the rotor holder (7) to provide a sliding surface between the rotor holder (7) and recess (8) to provide non-friction movement of the rotor holder (7) in the recess (8), preventing the viscous fluid to escape from the recess (8) and vice versa, comprising a bore in its center, through which the shaft (3) passes and in which the shaft (3) rotates when the motor (12) starts up for the first time, without rotating itself and which starts to move as a single unit together with the shaft (3), the rotor (4) and the rotor holder (7) after it starts.

2. A pump as claimed in claim 1 characterized in that the seal (2) comprises of one or more internal surfaces (17) forming the bore to accommodate the shaft (3) centrally and one or more side surfaces (16) having a greater surface than internal surfaces (17) and in full contact with the recess (8).

3. A pump as claimed in claim 2 characterized in that one or more grooves (18) are placed between internal surfaces (17).

Ansprüche

1. Pumpe für Ablasszwecke in Haushaltsgeräten, Geschirrspülmaschinen oder Waschmaschinen, umfassend einen Motor (12), ein Pumpengehäuse (13) zum Aufnehmen des Motors (12), eine Welle (3) zum Übertragen der vom Motor (12) erzeugten Leistung, einen Rotor (4), der mittels einer Vertiefung (8), die in ihrem Inneren ein viskoses Fluid aufweist, an die Welle (3) gekoppelt ist, eine Kupplung (5) mit einer Rotorhalterung (7) mit einer Mittelöffnung zum Aufnehmen einer Welle (3), die mittig nach Haftsitzart mit der Welle verbunden ist, und die die Antriebskraft von er Welle (3) nach Haftsitzart an den Rotor (4) überträgt, ein Rotorgehäuse (14), das den Rotor (4) aufnimmt und diesen in die Richtung des Ansaugens und Pumpens der Fluide lenkt, dadurch gekennzeichnet, dass eine Dichtung (2), die an der Rotorhalterung (7) vorgesehen ist, eine Gleitfläche zwischen der Rotorhalterung (7) und der Vertiefung (8) bereitstellt, um eine reibungsfreie Bewegung der Rotorhalterung (7) in der Vertiefung (8) zu ermöglichen, und verhindert, dass das viskose Fluid aus der Vertiefung (8) austritt, und umgekehrt, und in ihrer Mitte eine Bohrung umfasst, durch die die Welle (3) tritt und in der sich die Welle (3) dreht, wenn der Motor (12) erstmals gestartet wird, ohne sich selbst zu drehen, und beginnt, sich nach dem Starten des Motors (12) als Einheit zusammen mit der Welle (3), dem Rotor (4) und der Rotorhalterung (7) zu bewegen.

2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Dichtung (2) eine oder mehrere Innenflächen (17) umfasst, die die Bohrung zum mittigen Aufnehmen der Welle (3) bilden, und eine oder mehrere Seitenflächen (16), die eine größere Fläche aufweisen als die Innenflächen (17) und in vollem Kontakt mit der Vertiefung (8) stehen.

3. Pumpe nach Anspruch 2, dadurch gekennzeichnet, dass zwischen den Innenflächen (17) eine oder mehrere Nuten (18) angeordnet sind.

Revendications

1. Une pompe utilisée pour décharger dans les électroménagers, les lave-vaisselles ou les machines à laver comprenant un moteur (12), un corps de pompe (13) pour accueillir le moteur (12), un axe (3) pour transmettre la puissance produite par le moteur (12), un rotor (4) couplé à l'axe (3) au moyens d'un évidement (8) ayant un fluide visqueux à l'intérieur, un couplage (5) ayant un support de rotor (7) ayant un alésage central pour accueillir un axe (3), connecté centralement à l'axe (3) de façon d'ajustement serré, un logement de rotor (14) accueillant le rotor (4) et le guidant à la direction de l'aspiration et pompant les fluides, caractérisée en ce que un joint (2) déposé sur le support de rotor (7) pour fournir une surface de glissement entre le support de rotor (7) et l'évidement (8) pour permettre au support de rotor (7) de se déplacer sans frottement dans l'évidement (8), empêchant le fluide visqueux de sortir de l'évidement (8) et vice versa, comprenant un alésage dans son centre, à travers lequel l'axe (3) passe et dans lequel l'axe (3) tourne lorsque le moteur (12) démarre pour la première fois, sans se tourner et qui commence à se déplacer comme une seule élément avec l'axe (3), le rotor (4) et le support de rotor (7) après son démarrage.

2. Une pompe selon la Revendication 1, caractérisée en ce que le joint (2) comprenant une ou plusieurs surface(s) interne(s) (17) qui forme(nt) l'alésage pour accueillir l'axe (3) centralement et une ou plusieurs surface(3) latérales (16) ayant une surface plus grande que les surfaces internes (17) et en plein contact avec l'évidement (8).

3. Une pompe selon la Revendication 2, caractérisée en ce que une ou plusieurs rainure(s) (18) est/sont placée(s) entre les surfaces internes (17).

Drawing