阅读说明：本技术 低噪音旋转泵 (Low-noise rotary pump ) 是由 F·埃塞勒 T·沃尔 S·彼得斯 G·杰格尔 I·佩克鲁 于 2021-03-17 设计创作，主要内容包括：一种旋转泵,优选叶片单元泵或摆动滑块泵,包括定子和转子,所述转子能够在所述定子内绕旋转轴线旋转,其中,所述转子包括多个输送元件,所述多个输送元件能够相对于所述旋转轴线径向移动,并且两个相邻的输送元件与所述转子的外表面区域和所述定子的内表面区域一起限定输送单元,其中,呈现第一最大单元容积的至少两个输送单元,优选两个相邻的输送单元形成第一输送单元组,并且呈现第二最大单元容积的至少两个其它输送单元,优选两个其它相邻的输送单元形成第二输送单元组,使得所述第一输送单元组的输送单元的第一最大单元容积大于所述第二输送单元组的输送单元的第二最大单元容积。(A rotary pump, preferably a vane cell pump or a wobble slider pump, comprising a stator and a rotor, which is rotatable within the stator about an axis of rotation, wherein the rotor comprises a plurality of transport elements which are radially movable relative to the axis of rotation, and two adjacent conveying elements define a conveying unit together with an outer surface region of the rotor and an inner surface region of the stator, wherein at least two delivery units, preferably two adjacent delivery units, exhibiting a first maximum unit volume form a first group of delivery units, and at least two other delivery units, preferably two other adjacent delivery units, presenting a second maximum unit volume form a second delivery unit group, such that a first maximum cell volume of the delivery units of the first set of delivery units is greater than a second maximum cell volume of the delivery units of the second set of delivery units.)

1. A rotary pump (1), preferably a vane pump or a swing link slider pump, comprising:

(a) a stator (2), and

(b) a rotor (3), the rotor (3) being rotatable within the stator (2) about an axis of rotation (D), wherein

(c) The rotor (3) comprising a plurality of conveying elements (4) radially movable with respect to the axis of rotation (D), and

(d) two adjacent conveying elements (4) define conveying units (11-13, 21-26) together with an outer surface region of the rotor (3) and an inner surface region of the stator (2), wherein

(e) At least two conveying units, preferably two adjacent conveying units (11 to 13), exhibit a first maximum unit volume to form a first group (10) of conveying units, and

(f) at least two other of said conveying units, preferably two other adjacent conveying units (21 to 26), exhibiting a second maximum unit volume, to form a second group of conveying units (20),

it is characterized in that the preparation method is characterized in that,

(g) the first maximum cell volume of the conveying units (11 to 13) of the first conveying unit group (10) is larger than the second maximum cell volume of the conveying units (21 to 26) of the second conveying unit group (20).

2. The rotary pump (1) according to claim 1, characterized in that the conveying units (11 to 13) of the first conveying unit group (10) exhibit the first maximum unit volume which is at least substantially identical, and the conveying units (21 to 26) of the second conveying unit group (20) exhibit the second maximum unit volume which is at least substantially identical.

3. The rotary pump (1) according to one of the preceding claims, characterized in that the conveying elements (4) of the conveying units (11 to 13) which delimit the first group of conveying units (10) are each arranged at a first angular distance (a) from one another on the rotor (3), and the conveying elements (4) which delimit the conveying units (21 to 26) of the second group of conveying units (20) are each arranged at a second angular distance (β) from one another on the rotor (3), wherein the first angular distance (a) is greater than the second angular distance (β).

4. The rotary pump (1) according to one of the preceding claims, characterized in that the number of the conveyor units (11 to 13) in the first conveyor unit group (10) is not equal to the number of the conveyor units (21 to 26) in the second conveyor unit group (20).

5. The rotary pump (1) according to one of the preceding claims, characterized in that the number of the conveying units (11 to 13) in the first conveying unit group (10) is smaller than the number of the conveying units (21 to 26) in the second conveying unit group (20).

6. The rotary pump (1) according to one of the preceding claims, characterized in that the first conveying unit group (10) comprises at least two and at most six and in particular three conveying units (11 to 13), wherein adjacent conveying elements (4) of the first conveying unit group (10) are arranged on the rotor (3) at the first angular distance (a) of 40 ° to 45 °, in particular at the first angular distance (a) of 43 °.

7. The rotary pump (1) according to one of the preceding claims, characterized in that the second conveying unit group (20) comprises at least four and at most ten and in particular six conveying units (21 to 26), wherein adjacent conveying elements (4) of the second conveying unit group (20) are arranged at the second angular distance (β) of 35 ° to 40 °, in particular at the second angular distance (β) of 38.5 °, from each other on the rotor (3).

8. The rotary pump (1) according to one of the preceding claims, characterized in that the rotary pump (1) comprises a total of at least six and at most sixteen and in particular exactly nine of the delivery units (11 to 13, 21 to 26).

9. The rotary pump (1) according to one of the preceding claims, characterized in that a circumferential distance (U) of the conveying units (11 to 13) of the first conveying unit group (10) is defined between two adjacent conveying elements (4) along the inner surface region of the stator (2)_I) Greater than in two adjacent stationsA circumferential distance (U) between the conveying elements (4) defining the conveying units (21 to 26) of the second conveying unit group (20) along an inner surface region of the stator (2)_I)。

10. The rotary pump (1) according to one of the preceding claims, characterized in that a circumferential distance (U) of the conveying units (11 to 13) of the first conveying unit group (10) is defined between two adjacent conveying elements (4) along the outer surface region of the rotor (3)_A) A circumferential distance (U) greater than the conveying units (21 to 26) defining the second conveying unit group (20) along the outer surface area of the rotor (3) between two adjacent conveying elements (4)_A)。

11. The rotary pump (1) according to any of the preceding claims, characterized in that the rotary pump (1) comprises more than two groups of the delivery units.

12. The rotary pump (1) according to claim 11, characterized in that the maximum unit volume of the delivery units of each group of delivery units is not equal to the maximum unit volume of the delivery units of each other group of delivery units.

13. The rotary pump (1) according to claim 11, characterized in that the delivery units of two non-adjacent groups of delivery units exhibit the same maximum unit volume.

Technical Field

The invention relates to a rotary pump for conveying a medium. The rotary pump includes a stator and a rotor that is rotatable within the stator about an axis of rotation. The rotor comprises a plurality of transport elements distributed over the circumference of the rotor. The conveying elements are arranged on the rotor such that they can move radially relative to the axis of rotation. Each two adjacent delivery elements define, together with the outer surface region of the rotor, the inner surface region of the stator and the axial wall (bottom and cover), a delivery unit, so that the rotary pump comprises a plurality of delivery units, wherein at least two delivery units exhibiting a first maximum unit volume form a first delivery unit group. At least two other delivery units exhibiting a second maximum unit volume form a second group of delivery units.

Background

DE2415620a1 discloses a device for hydraulic pumps and positive displacement motors, in which the pump rotor has a non-uniform pitch between the individual pump bodies, for example pistons or vanes. The varying geometric distance between all the pump bodies means that the pulses of the conveying medium delivered by the pump are as continuous as possible in an irregular sequence, so that the overall noise level is reduced to a minimum without any form of isolation or shielding.

DE706484a1 discloses a rotary piston drive or a working machine with a sickle-shaped working space. The machine includes a housing in which an eccentric rotor is mounted, the eccentric rotor including a slot for a slide. To avoid exciting the rotor, the distance between the notches on the rotor circumference varies in magnitude, as measured in radians. Furthermore, the angle between the radius and the slider centerline is different for different sliders.

FR773258a1 also discloses a rotary piston machine whose vanes are connected to the piston cylinder such that they can move in a sickle-shaped working chamber, wherein the distances separating the vanes from each other differ in size.

Disclosure of Invention

It is an object of the present invention to provide a rotary pump that emits less noise during operation.

This object is achieved by using the features of claim 1, advantageous refinements being derived from the dependent claims, the description and the figures.

The rotary pump according to the invention is preferably embodied as a vane cell pump or a pendulum slider pump, which comprises a stator and a rotor. The rotor is arranged such that it can rotate about an axis of rotation within the stator. Furthermore, the rotor comprises a plurality of transport elements which are radially movable relative to the axis of rotation. Each two adjacent conveying elements define a conveying unit together with an outer surface region of the rotor and an inner surface region of the stator, so that the rotary pump comprises a plurality of conveying units. At least two delivery units exhibiting a first maximum unit volume form a first group of delivery units. The transport units of the first transport unit group are preferably adjacent transport units. The at least one second group of delivery units is formed by at least two further delivery units exhibiting a second maximum unit volume. The transport units of the second transport unit group are preferably adjacent transport units. The rotary pump preferably comprises only groups of delivery units. The rotary pump advantageously lacks a delivery unit which is not assigned to one of the groups of delivery units. In other words, the rotary pump preferably comprises only delivery units assigned to the delivery unit groups. The rotary pump may comprise delivery units that are grouped exactly into two delivery unit groups, three delivery unit groups, four delivery unit groups, etc.

According to the invention, the first maximum cell volume of the transport units of the first transport unit group differs from the second maximum cell volume of the transport units of the second transport unit group in that the first maximum cell volume is greater, advantageously at least 10% greater, particularly advantageously at least 15% greater, most particularly advantageously at least 20% greater. Grouping the delivery units into groups of delivery units in this manner advantageously means that the sound emission of the rotary pump during operation can be significantly reduced.

The implementation of the delivery units according to the invention and their grouping into delivery unit groups particularly influences the pressure pulses of the delivery medium delivered by the rotary pump such that the excitation vibrations caused by the pressure pulses are reduced. This in turn minimizes the noise emitted by the rotary pump.

The term "adjacent" should be understood to mean similar elements of the rotary pump which are immediately adjacent to each other in the circumferential direction of the rotor. The term "adjacent conveyor units" for example denotes conveyor units which are immediately adjacent to each other in the circumferential direction of the rotor. The term "adjacent conveying elements" denotes conveying elements which are immediately adjacent to each other in the circumferential direction of the rotor.

The stator preferably comprises a cylindrical hollow space in which the rotatable rotor is arranged. The maximum outer diameter of the rotor is advantageously smaller than the minimum inner diameter of the cylindrical hollow space of the stator. The cylindrical hollow space of the stator may present a circular cross-section or an elliptical cross-section or another type of cross-section.

The radial movement of the conveying elements is related to the axis of rotation of the rotor in a technically advantageous manner. The radial movement of the transport element towards the axis of rotation is preferably limited by the structure of the rotor and/or a support means, such as a support ring. The radial movement of the transport element away from the axis of rotation may be limited by an inner surface area of the stator and/or by a support means of the stator. When the rotor rotates due to centrifugal forces acting on the transport element, the transport element may for example move radially outwards, wherein the movement is limited by the inner surface area of the stator.

Each delivery unit exhibits a unit volume which can be filled with the delivery medium to be delivered when the rotary pump is operated, in particular when the rotor rotates about the axis of rotation. The cell volume of each delivery unit is advantageously changed when the rotor rotates about its axis of rotation. In a rotary pump designed as a multi-flow rotary pump (multi-flow rotary pump), the unit volume can be changed, for example, several times, in particular periodically, from the maximum unit volume to the minimum unit volume and then to the maximum unit volume, when the rotor rotates through 360 °. In a mono-flow rotary pump, the unit volume of the delivery unit will change, for example, from the maximum unit volume to the minimum unit volume only once to the maximum unit volume when the rotor rotates 360 °.

As mentioned above, the rotor has at least one rotational angular position in which the transport unit exhibits a maximum unit volume. Alternatively or additionally, the conveying unit can also exhibit a maximum unit volume over a range of rotational angular positions of the rotor. This is advantageously the rotational angle position and/or the rotational angle range of the rotor at which the transport unit passes a circumferential position at which the distance between the outer surface region of the rotor and the inner surface region of the stator is greatest.

To deliver the fluid, the size of the delivery unit is increased to the maximum unit volume as the rotor rotates, and then the size is decreased again. For each full revolution of the rotor, the delivery unit exhibits a cell volume which is the maximum cell volume of the respective delivery unit, i.e. the cell-specific maximum cell volume. During a 360 ° rotation of the rotor, the respective delivery unit reaches, but does not exceed, its maximum unit volume. There is no rotational angle position of the rotor in which the respective delivery unit exhibits a unit volume greater than its maximum unit volume.

In a first embodiment, in a particular embodiment in which the rotary pump comprises only one working flow, i.e. in a particular embodiment in which the rotary pump is a single-flow rotary pump, the rotary pump may be implemented such that each of the delivery units reaches its unit-specific maximum unit volume only once during a complete revolution of the rotor. If the pump is a multi-stream pump, it may be implemented in the second embodiment such that each of the delivery units reaches its unit specific maximum unit volume multiple times during a complete revolution of the rotor, for example if the working streams of the pumps have the same stroke. However, if the pump is a multi-stream pump, it may alternatively also be implemented in the third embodiment, such that each of the delivery units only reaches its unit specific maximum unit volume once during a complete rotation of the rotor, for example if the working streams of the pumps have different strokes.

The transport units of the first set of transport units preferably exhibit at least substantially the same first maximum unit volume, wherein the shapes of the transport units of the first set of transport units may be different and/or identical. The transport units of the second set of transport units preferably exhibit an at least substantially identical second maximum unit volume, irrespective of the embodiment of the transport units of the first set of units, wherein the shape of the transport units of the second set of transport units may be different and/or identical. An "at least substantially identical maximum unit volume" is to be understood in particular to mean that the two unit volumes can differ from one another by at most 10%, advantageously by at most 5%, particularly advantageously only due to manufacturing tolerances.

In an advantageous development, the conveyor elements of the conveyor units defining the first conveyor unit group are each arranged at a first angular distance (angular distance) from one another on the rotor. The conveying elements of the conveying units defining the second conveying unit group may each be arranged on the rotor at a second angular distance from each other, wherein the angular distances are defined such that they describe an angle enclosed by two straight lines, wherein the straight lines each connect a reference point of two adjacent conveying elements on the rotor to a vertex of the angle on the rotational axis of the rotor.

The first angular distance between every two transport elements of the first group of transport elements is preferably at least substantially the same, and the second angular distance between every two transport elements of the second group of transport elements is at least substantially the same, wherein the first angular distance is different from the second angular distance. "at least substantially identical angular distances" is to be understood in particular to mean that two angular distances can differ from one another by at most 1 °, advantageously by at most 0.5 °, and particularly advantageously only by manufacturing tolerances. The first angular distance is advantageously greater than the second angular distance, advantageously at least 1 ° greater, particularly advantageously at least 3 ° greater, and most particularly advantageously at least 5 ° greater. The first angular distance may be, for example, between 40 ° and 45 °, preferably 43 °. The second angular distance may measure, for example, 35 to 40 °, preferably 38.5 °.

In a further embodiment of the rotary pump, the number of transport units in the first transport unit group is not equal to the number of transport units in the second transport unit group. In general, the number of delivery units in each group of delivery units may vary as desired, as long as each group of delivery units comprises at least two delivery units. The number of conveyor units in the first set of conveyor units is preferably smaller than the number of conveyor units in the second set of conveyor units. The first group of transporting units may for example comprise three transporting units, while the second group of transporting units comprises six transporting units. In this exemplary embodiment, the rotary pump comprises a total of nine delivery units.

In a further refinement, the circumferential distance of the transport units defining the first transport unit group between two adjacent transport elements along the inner surface region of the stator is greater than the circumferential distance of the transport units defining the second transport unit group between two adjacent transport elements along the inner surface region of the stator. In this further development, all the conveying elements can be arranged, for example, at a constant angular distance from one another on the rotor without projecting radially perpendicularly out of the rotor. The conveying elements may alternatively be arranged radially at an inclination on the rotor.

Advantageously, the circumferential distance of the conveyor units defining the first group of conveyor units along the outer surface region of the rotor between two adjacent conveyor elements is greater than the circumferential distance of the conveyor units defining the second group of conveyor units along the outer surface region of the rotor between two adjacent conveyor elements. In a rotary pump in which the circumferential distance between all the conveying elements along the inner surface region of the stator is constant, the first maximum unit volume of the conveying units of the first conveying unit group can be implemented, for example, larger than the second maximum unit volume of the conveying units of the second conveying unit group. In this embodiment, the conveying elements are preferably arranged radially at an inclination on the rotor.

In a possible development, the rotary pump can comprise more than two conveying unit groups, wherein the maximum unit volume of the conveying units of each conveying unit group is advantageously not equal to the maximum unit volume of the conveying units of each of the other conveying unit groups. The rotary pump may for example comprise three sets of conveying units, wherein the conveying units of a first set of conveying units exhibit a first maximum unit volume, the conveying units of a second set of conveying units exhibit a second maximum unit volume, and the conveying units of a third set of conveying units exhibit a third maximum unit volume. The first maximum unit volume is advantageously greater than the second maximum unit volume, which is advantageously greater than the third maximum unit volume.

Alternatively or additionally, in embodiments in which the rotary pump comprises more than three sets of conveying elements, the maximum element volume of the conveying elements of non-adjacent sets of conveying elements may be the same. An embodiment of the rotary pump comprising six groups of delivery units may for example be implemented in such a way that two non-adjacent groups of delivery units comprise delivery units exhibiting the same maximum unit volume.

In a preferred embodiment of the rotary pump, the rotor is arranged eccentrically with respect to the stator. In other words, the stator, in particular the cylindrical hollow space in which the rotor is arranged, may present a central axis. If eccentrically disposed, the central axis of the stator is spaced from the axis of rotation of the rotor. This means that the distance between the outer surface area of the rotor and the inner surface area of the stator varies and/or is not constant over the circumference of the rotor. Such eccentricity is advantageous, for example, in a single-flow rotary pump.

In a further refinement, the eccentricity (eccentricities) between the stator and the rotor is variable. The position of the stator relative to the rotor may for example be variable, such that the distance between the central axis of the stator and the axis of rotation of the rotor is variable. The variable eccentricity between the stator and the rotor advantageously means that the delivery rate of the rotary pump can be controlled during operation, in particular when the rotor is rotating. The rotary pump may for example exhibit a maximum delivery rate at maximum eccentricity, in particular a maximum distance between the central axis of the stator and the axis of rotation of the rotor, and a minimum delivery rate at minimum eccentricity, in particular a minimum distance between the central axis of the stator and the axis of rotation of the rotor.

The region in which the distance between the outer surface region of the rotor and the inner surface region of the stator increases in the direction of rotation of the rotor advantageously forms the suction region of the rotary pump. The suction region starts, for example, at a circumferential position of the stator, at which the distance between the outer surface region of the rotor and the inner surface region of the stator is minimal. The delivery unit advantageously has a minimum unit volume when it reaches the beginning of the suction zone by rotating the rotor. The suction zone may terminate at a circumferential location of the stator where the distance between the outer surface region of the rotor and the inner surface region of the stator is greatest. The delivery unit advantageously has the largest unit volume when it reaches the end of the suction zone by rotating the rotor. The suction region of the rotary pump is preferably connected to a suction port via which the transport medium can be supplied.

The region in which the distance between the outer surface region of the rotor and the inner surface region of the stator in the rotational direction of the rotor is reduced can form a pressure region of the rotary pump. The pressure region starts, for example, at a circumferential position of the stator, at which the distance between the outer surface region of the rotor and the inner surface region of the stator is greatest. The conveying unit advantageously has a maximum unit volume when it reaches the beginning of the pressure zone by rotating the rotor. The pressure zone may terminate at a circumferential location of the stator where the distance between the outer surface region of the rotor and the inner surface region of the stator is at a minimum. The transport unit advantageously has a minimum unit volume when it reaches the end of the pressure area by rotating the rotor. The pressure region of the rotary pump is preferably connected to a pressure port via which the conveying medium can be discharged.

In a further embodiment, the rotary pump can comprise a stator which exhibits a cylindrical hollow space with an elliptical cross section, so that the rotary pump can deliver media in a multi-stream manner. The term "multi-flow" means that the rotary pump comprises a plurality of suction zones and pressure zones.

In a rotary pump designed as a vane cell pump, the conveying elements are designed as vanes. In a rotary pump designed as a pendulum slider pump, the conveying element is designed as a pendulum which is preferably arranged on the rotor so as to be pivotable, in particular so as to be pivotable in the circumferential direction relative to an outer surface region of the rotor. In this embodiment, the stator is advantageously embodied as a rotatable outer rotor which is connected to the wobble member in such a way that the rotational movement of the rotor can be transmitted to the outer rotor via the wobble member.

Rotary pumps are particularly designed for use in motor vehicles. Thus, the rotary pump may be implemented as a motor vehicle pump. The rotary pump is preferably designed to deliver a liquid, in particular a lubricant, a coolant and/or an actuator. Thus, the rotary pump may be implemented as a liquid pump. The rotary pump is preferably designed to supply, lubricate and/or cool a motor vehicle drive motor or a motor vehicle transmission. The liquid is preferably embodied as an oil, in particular as engine lubricating oil or transmission oil. The rotary pump may be embodied as an engine lubricant pump for a motor vehicle or as a transmission pump for a motor vehicle.

Drawings

Different exemplary features of the invention can be combined according to the invention as far as technically convenient and appropriate. Further features and advantages of the invention emerge from the following description of an exemplary embodiment based on the drawings. The figures show:

fig. 1 is a schematic cross-sectional view of a first exemplary embodiment of a rotary pump according to the present invention;

FIG. 2 is a second schematic cross-sectional view of the first exemplary embodiment of the rotary pump according to the present invention;

FIG. 3 is a third schematic cross-sectional view of the first exemplary embodiment of the rotary pump according to the present invention;

fig. 4 is a sectional view of a second exemplary embodiment of a rotary pump according to the present invention.

Description of the reference numerals

1 vane pump

2 stator

3 rotor

4 conveying element

10 first conveying unit group

11 conveying unit

12 conveying unit

13 conveying unit

20 second conveying unit group

21 conveying unit

22 transport unit

23 transport unit

24 conveying unit

25 conveying unit

26 conveying unit

Alpha first angular distance

Beta second angular distance

Rotating shaft of D rotor

Center shaft of M stator

U_ICircumferential distance along the inner surface area of the stator

U_ACircumferential distance along the outer surface area of the rotor

Detailed Description

Fig. 1 shows a schematic cross-sectional view of a first exemplary embodiment of a rotary pump 1, in which the rotary pump 1 is embodied as a vane cell pump 1 comprising a stator 2 with a cylindrical hollow space.

The rotor 3, which is rotatable about a rotational axis D, which in the exemplary embodiment shown is arranged eccentrically with respect to the stator 2, is arranged within the cylindrical hollow space of the stator 2, the outer diameter of the rotor 3 being smaller than the inner diameter of the cylindrical hollow space of the stator 2, such that an outer surface region of the rotor 3 is spaced apart from an inner surface region of the stator 2, the rotational axis D preferably also forming a central axis of the rotor 3.

As shown in fig. 1, the rotor 3 comprises a plurality of conveying elements 4 distributed over the circumference of the rotor 3, the conveying elements 4 projecting radially from the rotor 3 with respect to the axis of rotation D and being attached or arranged on the rotor 3 such that they can move in the radial direction. The radial movement of the conveying elements 4, directed outwards away from the axis of rotation D, is limited by the inner surface area of the stator 2.

Each two adjacent conveying elements 4 define, together with the inner surface area of the stator 2 and the outer surface area of the rotor 3, a conveying unit 11 to 13, 21 to 24. The exemplary embodiment shown in fig. 1 comprises a total of seven transport units 11 to 13, 21 to 24. Each delivery unit 11 to 13, 21 to 24 presents the maximum unit volume due to the eccentricity of the rotor 3 with respect to the stator 2. For example, in the vane cell pump 1 shown in fig. 1, due to the rotational movement of the rotor 3, the delivery units 11 to 13, 21 to 24 reach their maximum cell volume when they are in the "12 o' clock" position, and therefore, the delivery unit 12 has reached its maximum cell volume when the vane cell pump 1 is in the state shown in fig. 1.

Three adjacent delivery units 11 to 13 exhibit the same first maximum unit volume at the "12 o 'clock" position and together form a first delivery unit group 10, four adjacent delivery units 21 to 24 exhibit the same second maximum unit volume at the "12 o' clock" position and together form a second delivery unit group 20, the first maximum unit volume of the delivery units 11 to 13 being greater than the second maximum unit volume of the delivery units 21 to 24.

The area between the outer surface area of the rotor 3 and the inner surface area of the stator 2 on the right-hand half of the vane cell pump 1 shown in fig. 1 forms a suction area when the rotor 3 rotates counterclockwise. In the suction region, the cell volume of the delivery units 11 to 13, 21 to 24 increases in size from a minimum cell volume at the "6 o 'clock" position to a maximum cell volume at the "12 o' clock" position. In an advantageous embodiment of the vane cell pump 1, the suction area is connected to a suction opening (not shown) for conveying the medium, so that the conveying medium is sucked via the suction opening by increasing the conveying volume of the respective conveying unit 11 to 13, 21 to 24.

When the rotor 3 rotates counterclockwise, the area between the outer surface area of the rotor 3 and the inner surface area of the stator 2 on the left-hand side half of the vane cell pump 1 shown in fig. 1 forms a pressure area. In the pressure region, the size of the cell volume of the conveying units 11 to 13, 21 to 24 decreases from the maximum cell volume at the "12 o 'clock" position to the minimum cell volume at the "6 o' clock" position. In an advantageous embodiment of the vane cell pump 1, the pressure region is connected to a pressure connection (pressure outlet, not shown) for the conveying medium, so that the conveying medium is pumped out via the pressure connection (pressure outlet) by a reduction of the conveying volume of the respective conveying unit 11 to 13, 21 to 24.

Since the conveying units 11 to 13, 21 to 24 are advantageously embodied and grouped into two conveying unit groups, the pressure pulses of the conveying medium at the pressure ports (pressure outlets) are influenced such that the excitation vibrations caused by the pressure pulses are reduced. This in turn minimizes the noise emitted by the vane cell pump 1.

Fig. 2 shows a further schematic cross-sectional view of the first embodiment of the rotary pump 1, in which the angular distances α, β of the individual conveying elements 4 from one another are shown. The conveyor elements 4 of the conveyor units 11 to 13 of the first conveyor unit group 10 are constrained to be arranged at a first angular distance α from each other on the rotor 3, and the conveyor elements 4 of the conveyor units 21 to 24 of the second conveyor unit group 20 are constrained to be arranged at a second angular distance β from each other on the rotor 3, wherein the first angular distance α is greater than the second angular distance β. This means that the respective first maximum cell volumes of the transport units 11 to 13 of the first group of transport units 10 are larger than the respective second maximum cell volumes of the transport units 21 to 24 of the second group of transport units 20.

Fig. 2 also shows a circumferential distance U extending along the inner surface area of the stator 2 between two adjacent conveying elements 4_I. In the embodiment of the rotary pump 1 shown in fig. 2, the circumferential distance U between the conveyor units 11 to 13 of the first conveyor unit group 10_IAnd a circumferential distance U_AAre all greater than the circumferential distance U between the conveyor units 21 to 24 of the second conveyor unit group 20_IAnd U_AIn particular in the embodiment of a rotary pump 1 (not shown) in which the conveying elements 4 are arranged at a constant angular distance on the rotor 3 but do not project perpendicularly radially outward from the outer surface region of the rotor 3, due to the different circumferential distances U_IAnd/or different circumferential distances U_AThe maximum cell volume of the transport units 11 to 13 of the first set of transport units 10 may be different with respect to the maximum cell volume of the transport units 21 to 24 of the second set of transport units 20.

Fig. 3 shows an exemplary embodiment of the rotary pump 1 shown in fig. 1, wherein the axis of rotation D of the rotor 2 and the central axis M of the stator 2 are shown. The rotation axis D is offset from the central axis M so that the rotor 3 is arranged eccentrically with respect to the stator 2, which eccentricity means that the area between the outer surface area of the rotor 3 and the inner surface area of the stator 2 on the right-hand half of the rotary pump 1 forms the suction area when the rotor 3 rotates counterclockwise. Conversely, the region between the outer surface region of the rotor 3 and the inner surface region of the stator 2 forms a pressure region on the left-hand half of the rotary pump 1.

In a development of the embodiment of the rotary pump 1 shown in fig. 3, the eccentricity of the rotor 3 relative to the stator 2 can be designed to be variable. The position of the stator 2 relative to the rotor 3 can for example be changed in such a way that in the second position of the stator 2 the centre axis M coincides with the rotation axis D. As a result, the distance between the outer surface area of the rotor 3 and the inner surface area of the stator 2 remains constant over the entire circumference. In operation, the rotary pump 1 exhibits a so-called zero throughput in the second position of the stator 2, in which position the delivery speed of the rotary pump 1 is significantly reduced or eliminated. Finally, the delivery rate of the rotary pump can be controlled by the eccentricity of the stator 2 with respect to the rotor 3.

Fig. 4 shows a sectional view of a second exemplary embodiment of the rotary pump 1, in which the rotary pump 1 is again embodied as a vane-cell pump 1, in which the vane-cell pump 1 comprises a total of nine conveying units 11 to 13, 21 to 26, a first conveying-unit group 10 being formed by adjacent conveying units 11 to 13, wherein the adjacent conveying units 11 to 13 are defined by conveying elements 4 arranged on the rotor 3 at a first angular distance α (not shown) of 43 ° from one another, and a second conveying-unit group 20 being formed by adjacent conveying units 21 to 26, wherein the adjacent conveying units 21 to 26 are defined by conveying elements 4 arranged on the rotor 3 at a second angular distance β (not shown) of 38.5 ° from one another.