WO2011154237A2

WO2011154237A2 - Rotary vane pump

Info

Publication number: WO2011154237A2
Application number: PCT/EP2011/058252
Authority: WO
Inventors: André MAEDER; Eike Stitterich
Original assignee: Mahle International Gmbh
Priority date: 2010-06-09
Filing date: 2011-05-20
Publication date: 2011-12-15
Also published as: EP2580477B1; EP2580477A2; WO2011154237A3

Abstract

The invention relates to a rotary vane pump (1), comprising an interior (2), a rotor (3), which is rotatably mounted therein and which has a slot (4) extending perpendicularly to the rotational axis (9), a vane (5), which is movably supported in the slot (4) of the rotor (3) and divides the interior (2) into two chambers and contacts the inner circumferential surface of the interior so that the vane (5) moves relative to the rotor (3) and the rotor (3) moves relative to the inner circumferential track (7). It is essential to the invention that the interior (2) has a cross-sectional shape that deviates from a circular shape and that has steady curvature, in other words has no curvature jumps, said cross-sectional shape being designed in such a way that there is an equal distance between the longitudinal ends (6, 6') of the vane (5) and the inner circumferential track (7) in certain rotational positions of the vane (5), in which the vane (5) contacts the inner circumferential track (7) at both longitudinal ends (6, 6'), and that the slot (4) has at least one convex slot wall (11, 12).

Description

Rotary vane pump

The present invention relates to a rotary vane pump according to the

Preamble of claim 1.

From WO 2007/1 18501 A1 a generic rotary vane pump with an interior and a rotor rotatably mounted therein is known. The rotor has a transverse to its axis of rotation slot in which a wing is slidably mounted. This wing divides the inner space into two chambers and abuts on an inner peripheral surface of the inner space, so that the wing with respect to the rotor and the rotor relative to the inner peripheral surface can perform a relative movement.

A disadvantage of such known rotary vane pumps is often that they do not run smoothly, especially at higher speeds.

The present invention deals with the problem for a

Rotary vane pump of the generic type to provide an improved or at least one alternative embodiment, which is characterized in particular by a high degree of smoothness.

This problem is inventively achieved by the subject matter of

independent claim 1 solved. Advantageous embodiments are

Subject of the dependent claims.

The present invention is based on the general idea, in a known rotary vane pump with a rotatably mounted in an interior rotor with a transverse to the axis of rotation slot and a slidably mounted in this slot wings, which divides the interior into two chambers and with its longitudinal ends along a

Inner circumferential path of the interior along, a cross-sectional shape of the interior deviating from a circular shape, but curvature continuous, that is, having no curvature jump to design and form such that between the longitudinal ends of the wing and the inner circumferential track in all and especially in critical rotational positions of the wing a same Distance, that is a game always the same, exists, whereby a jerk-free operation of

Rotary vane pump is enabled. The cross-sectional shape according to the invention is approximately equal to a compressed circular shape and is made of a

oscillating sine / cosine function, which is described as the wing is rotated by a fixed point on the wing. When the rotor rotates, the vane is displaced back and forth along the slot, with the value of the distance of, for example, a vane center and the axis of rotation of the rotor changing sinusoidally / cosinusoidally. Together with the

Rotation movement and the finite width of the wing can be calculated from this responsible for optimal smoothness cross-sectional shape of the interior.

In a further advantageous embodiment of the invention

Solution, the wing recesses, in particular in the manner of circular openings, which are arranged parallel to the axis of rotation of the wing. These recesses reduce the weight of the wing and thus its moment of inertia and the energy required to move the wing, whereby the efficiency of the invention

Rotary vane pump can be improved. The recesses may of course also have a square, oval or honeycomb-shaped cross-section. In an advantageous development of the solution according to the invention, the rotor and / or the wing are made of plastic. This allows a cost-effective and manufacturing technology simple manufacturing of the rotor and the wing, whereby the manufacturing cost of the rotary vane pump can be kept low overall.

Second, the present invention is based on the general idea of a bearing slidably mounted in a slot of a rotor

Rotary vane pump mounted wing thereby improve that at least one of the two slot walls is formed spherical and thereby on the one hand quieter operation of the rotary vane pump allows and on the other hand, an improved sealing function and thus higher performance. Of course, this is accompanied by a reduced friction between the rotor and the wing. Since the wing in the rotary vane pump according to the invention also has only only linear contact with the slot, a lighter adjustment can be achieved movement of the wing along the slot. The at least one convex diaphragm wall also improves the leadership of the wing, which in turn makes noticeable in the improved sealing function and thus in the improved performance of the rotary vane pump.

In an advantageous development of the solution according to the invention, the rotor and / or the wing are made of plastic. This allows a cost-effective and manufacturing technology simple manufacturing of the rotor and the wing, whereby the manufacturing cost of the rotary vane pump can be kept low overall.

Suitably, the slot walls are provided with a support, in particular with a sheet metal support. Such a sheet metal support has in comparison to a purely made of plastic diaphragm wall a much improved

Wear behavior, wherein still a separate manufacturing process of the rotor and the wing is conceivable through the sheet metal supports, which can be subsequently applied to the previously manufactured rotor.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated

Description of the figures with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Show, in each case schematically,

1 is a rotary vane pump according to the invention in the open position,

Fig. 2 shows a possible cross-sectional shape of an inventive shaped

Interior,

Fig. 3 shows a structure in the manner of an exploded view of a

rotary vane pump according to the invention, 4 shows different views of an inventively designed rotor of the rotary vane pump,

Fig. 5 is a rotor with an active lubrication.

According to FIG. 1, a rotary vane pump 1 according to the invention has an interior space 2 in which a rotor 3 is rotatably mounted. This rotor 3 has a transverse to the axis of rotation thereof extending slot 4, in which a wing 5 is slidably mounted. The wing 5 divides the interior 2 of the rotary vane pump 1 into two chambers and runs with its longitudinal ends 6 and 6 'during operation of the rotary vane pump 1 along an inner peripheral track 7 of the interior 2 from. According to the invention, the interior space 2 now has a curvature-constant, that is, no curvature-discontinuing, cross-sectional shape, as shown, for example, in FIG. 2, wherein the cross-sectional shape and thus the interior space 2 are formed such that between the longitudinal ends 6 , 6 'of the wing and the inner circumferential track 7 in all, in particular critical rotational angular positions of the wing 5 an equal distance, that is, an equal game prevails. This may be due solely to the design or

Shaping the inner space 2 a smooth movement of the wing 5 are forced, whereby the rotary vane pump 1 according to the invention a

comparatively high smoothness experiences.

Looking at Fig. 1, it can be seen that the wing. 5

Recesses 8, on the one hand help to reduce the weight of the wing 5 and on the other hand also reduce a moment of inertia of the wing 5, whereby less energy to drive the

Rotary vane pump 1 is required. The inventive

Rotary vane pump 1 can in principle be part of a not shown Form brake booster in a motor vehicle, but also elsewhere, for example, be used as a vacuum pump.

To be able to form the rotary vane pump 1 as inexpensively as possible, the rotor 3 and / or the vane 5 may be formed of plastic, which allows for a simple and cost-effective production and on the other hand a high degree of flexibility.

With the invention shaped interior 2, which causes the wing 5 in the operation of the rotary vane pump 1, that is, during its rotation, in those rotational angular positions in which the wing 5 with both

Longitudinal ends 6,6 'rests against the inner peripheral track 7, has a same distance from the inner circumferential track 7, a jerk-free operation and thus a high degree of smoothness of the rotary vane pump 1 can be ensured.

According to FIG. 3, a rotary vane pump 1 has one in one

Interior 2 eccentrically rotatably mounted rotor 3 with a transverse to

Rotary axis 9 extending slot 4 (see also Fig. 4). In the slot 4 of the rotor 3 while a wing 5 is slidably mounted, which divides the interior 2 into two chambers and which rests against an inner peripheral surface of the inner space 2, so that the wing 5 with respect to the rotor 3 and the rotor 3 with respect to the inner peripheral surface of a Performs relative movement. The rotor 3 may have the shape shown in FIG. 3 or else that shown in FIG. 4. According to FIG. 3, the wing 5 is additionally held by a rotor housing on the rotor 3, it being understood that this can be dispensed with given a correspondingly long axial configuration of the rotor 3. It is essential to the invention that the slot has at least one, preferably two, spherically formed slot walls 10 and 11. The two slot walls 10,11 are preferably curved convexly towards the slot 4, whereby the slot 4 with its Each of the longitudinal ends 12, 13 has a slot width of x + n for n> 0, whereas in the middle 14 it has only one slot width of x. The slot 4 thus widens toward its longitudinal ends 12, 13. The slot 4 thus has a biconcave shape.

The spherically shaped diaphragm walls 10,11 cause no full-surface contact between the slot walls 10,11 on the one hand and the wing 5 on the other hand, but only a linear contact, whereby on the one hand a guide of the wing 5 can be improved and on the other hand

Adjustability of the wing 5 in the slot 4 is facilitated. To increase the wear resistance, the slot walls 10,11 at least

partially with a support, not shown, in particular with a

Sheet metal pad, be provided, wherein the wing 5 and the rotor 3 can generally be made of plastic, in particular as a plastic injection molded part. Of course, it is also conceivable that the two diaphragm walls 10,1 differ in terms of their crowning, that is formed differently spherical. For example, according to FIG. 4, a distance n1> n2 may be. The crown may also be symmetrical or asymmetrical.

The rotary vane pump 1 according to the invention can, for example, at

Hydraulic power units but also used in brake boosters in motor vehicles.

According to FIG. 5, the rotor 3 has an active lubrication of its slot 4. For this purpose, it has a through hole 15 through which lubricant, in particular oil, is pumped into the slot 4 and lubricates the wing 5 mounted there. This leads to a significant improvement of the lubrication and also the cooling of the blade 5 in the slot 4, as well as a lubrication when sliding the blade 5 on the inner circumferential track 7. This makes it possible the Drehschieberpunnpe 1, in particular a vacuum pump to operate at much higher speeds.

Advantages:

- Better lubrication and thus less friction,

- Reduction of the size of the rotary vane pump 1 and thereby less material use.

Of course, it is clear that the individual features of the

Rotary vane pumps 1 according to FIGS. 1, 2 and as shown in FIGS. 3,4,5 in any, but meaningful way are combined with each other, so that, for example, a rotary vane pump 1 with a

deviating from a circular shape, curvature continuous interior cross-section and a rotor 3 with a slot 4, which may have at least one convex diaphragm wall 10.1 1.

Claims

claims

1 . Rotary vane pump (1) with a rotatably mounted in an interior (2) rotor (3) with a transverse to the axis of rotation slot (4), in the slot (4) of the rotor (3) slidably mounted wings (5), the interior

(2) divided into two chambers and running with its longitudinal ends (6,6 ') along an inner circumferential track (7) of the interior (2),

characterized,

the interior (2) has a shape deviating from a circular shape,

curvature-continuous, that is, having no curvature jump

Has cross-sectional shape which is formed such that between the

Longitudinal ends (6,6 ') of the wing (5) and the inner peripheral track (7) in certain rotational positions of the wing (5), in which the wing 5 with both longitudinal ends 6,6' on the inner circumferential track (7), an equal distance consists.

2. rotary vane pump (1) with an interior (2), a rotatably mounted therein rotor (3) with a transverse to the axis of rotation (9) extending slot (4), in the slot (4) of the rotor (3) slidably mounted wings ( 5), which divides the inner space (2) into two chambers, and bears against the inner peripheral surface of the inner space, so that the wing (5) with respect to the rotor (3) and the rotor

(3) with respect to the inner circumferential track (7) perform a relative movement, characterized

in that the slot (4) has at least one ball-shaped slot wall (1 1, 12).

3. Rotary vane pump (1) with an interior (2), a rotatably mounted therein rotor (3) with a transverse to the axis of rotation (9) extending slot (4), in the slot (4) of the rotor (3) slidably mounted wings ( 5) dividing the inner space (2) into two chambers and abutting against the inner peripheral surface of the inner space so that the vane (5) relative to the rotor (3) and the rotor (3) relative to the inner circumferential path (7), characterized,

- That the interior (2) has a deviating from a circular shape,

curvature-continuous, that is, having no curvature jump

Has cross-sectional shape which is formed such that between the longitudinal ends (6,6 ') of the wing (5) and the inner peripheral track (7) in

certain rotational positions of the wing (5), in which the wing 5 with both longitudinal ends 6,6 'rests against the inner peripheral track (7), there is an equal distance,

- That the slot (4) has at least one convex slot wall (1 1, 12).

4. Rotary vane pump according to claim 2 or 3,

characterized,

that both slot walls (1 1, 12) are formed spherical and convex to the slot (4) are curved so that the slot (4) has a biconcave shape.

5. Rotary vane pump according to one of claims 2 to 4,

characterized,

that the slot (4) widens towards its longitudinal ends (12, 13).

6. Rotary vane pump according to one of claims 2 to 5,

characterized, that the two slot walls (10,) in terms of their crown

distinguish, that is differently formed spherical.

7. Rotary vane pump according to one of claims 2 to 6,

characterized,

that the slot walls (1 1, 12) with a support, in particular with a

Sheet metal support, are provided.

8. rotor (3) for a rotary vane pump (9) according to one of claims 2 to 7, with a transverse to the axis of rotation (9) extending slot (4), which has at least one convexly formed slot wall (10,1 1).

9. Rotary vane pump according to one of claims 1 to 7,

characterized,

- That the rotary vane pump (1) is part of a hydraulic unit in a motor vehicle, or

- That the rotary vane pump (1) is part of a brake booster in a motor vehicle.

10. Rotary vane pump according to one of claims 1 to 7 or 9,

characterized,

- That the rotor (3) and / or the wing (5) are formed of plastic, and / or

- That the wing (5) has recesses (8).

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