(57) Pump with a rotor (10) comprising one or more vanes (12a, 12b, ...), wherein each
vane (12a, 12b, ...) is arranged to run each in a corresponding diametrical slot (141,
142 ...) in the rotor (10), each vane (12a, 12b, ...) extends from an end edge (17a1,
17b1, ...) to the opposite end edge (17a2, 17b2 ...) substantially across the entire
inner diameter (Ø) of the rotor housing, between two opposite sides of the inner wall
surface (2) for all rotation angles of the rotor (10), and wherein the cross-section
of the cylindrical rotor housing (1) is non circular with a radius (R) from the center
of the rotor (10) to the inner wall surface (2), increasing from a base radius (R0) with a given rate (DeltaR) per arclength counted from a top point (T) to 180 degrees-from
the top point (T), and decreases with an equivalent rate continuously for the increasing
arclength further to the top point (T).
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