Reduced-noise rotary pump

A rotary pump comprising:

• (a) a stator and
• (b) a rotor rotatable about a rotational axis within the stator, wherein
• (c) the rotor comprises multiple delivery elements adapted to move radially in relation to the rotational axis, and
• (d) two adjacent delivery elements limit a delivery cell together with an outer surface area of the rotor and an inner surface area of the stator, wherein
• (e) at least two delivery cells, which exhibit a first maximum cell volume form a first delivery cell group, and
• (f) at least two other delivery cells, which exhibit a second maximum cell volume form a second delivery cell group,
• wherein
• (g) the first maximum cell volume of the delivery cells of the first delivery cell group is larger than the second maximum cell volume of the delivery cells of the second delivery cell group, and
• (h) wherein the first delivery cell group comprises at least two and at most six delivery cells, wherein the adjacent delivery elements of the first delivery cell group are arranged at a first angular distance of 43° from each other on the rotor.

A rotary pump comprising:

• (a) a stator and
• (b) a rotor rotatable about a rotational axis within the stator, wherein
• (c) the rotor comprises multiple delivery elements adapted to move radially in relation to the rotational axis, and
• (d) two adjacent delivery elements limit a delivery cell together with an outer surface area of a rotor and the inner surface area of the stator, wherein
• (e) at least two delivery cells which exhibit a first maximum cell volume form a first delivery cell group and
• (f) at least two other delivery cells which exhibit a second maximum cell volume form a second delivery cell group,
• wherein
• (g) the first maximum cell volume of the delivery cells of the first delivery cell group is larger than the second maximum cell volume of the delivery cells of the second delivery cell group, and
• (h) wherein the second delivery cell group comprises at least four and at most ten delivery cells, wherein the adjacent delivery elements of the second delivery cell group are arranged at a second angular distance of 38.5° from each other on the rotor.

A rotary pump comprising:

• (a) a stator and
• (b) a rotor rotatable about a rotational axis within the stator, wherein
• (c) the rotor comprises multiple delivery elements adapted to move radially in relation to the rotational axis, and
• (d) two adjacent delivery elements limit a delivery cell together with an outer surface area of a rotor and the inner surface area of the stator, wherein
• (e) at least two delivery cells which exhibit a first maximum cell volume form a first delivery cell group and
• (f) at least two other delivery cells which exhibit a second maximum cell volume form a second delivery cell group,
• wherein
• (g) the first maximum cell volume of the delivery cells of the first delivery cell group is larger than the second maximum cell volume of the delivery cells of the second delivery cell group, and
• (h) wherein the rotary pump comprises a total of at least six and no more than sixteen delivery cells.