Fluid pump with volute shaped housing

The present invention relates to a fluid pump (1), a method to manufacture the fluid pump (1) and another method to operate the fluid pump (1), where the fluid pump (1) comprises a housing (2) having an inlet opening (31) for receiving the fluid (F), an outlet opening (32) for discharging the fluid (F) and enclosing an impeller (4) rotating inside the housing (2) to pump the fluid (F) from the inlet opening (31) to the outlet opening (32) and a motor assembly to drive the impeller (4), wherein the housing (2) is shaped to establish a single turn volute of 360° turn angle providing a first conveying channel (21) located peripherally around the impeller (4) from a fluid entry point (21a) at 0° turn angle to a fluid exit point (21c) at 360° turn angle of the single turn volute being connected to the outlet opening (32), where the first conveying channel (21) has a first cross section area (21F) in radial direction (RD) perpendicular to the rotational plane (41) of the impeller (4), where a size of the first cross section area (21F) increases as a monotonic increasing function of the turn angle between entry point (21a) and exit point (21b), where the monotonic increasing function (MIF) has an average slope in a first turn angle interval (21i) from a first turn angle (21b) to the 360° turn angle at the exit point (21b) being smaller than the average slope in a second turn angel interval (21s) between 0° turn angle and the first turn angle (21b) to increase a velocity of the conveyed fluid (F) at least in an area (211) of the first conveying channel (21) assigned to the first turn angle interval (21i).