Stirrer

A stirrer comprising a stator and a rotor capable of rotating to the stator,

• the rotor being provided with a main shaft as a center of the rotation and a plurality of blades,
• the stator being provided with one or a plurality of stator part,
• the stator part surrounding the plurality of blades with the main shaft of the rotor as the center thereof, and
• a rotational direction of the rotor being in a circumferential direction,
• the stator part comprising a plurality of penetrating parts in the circumferential direction thereof and a stator main part located between the penetrating parts adjacent to each other, and
• a fluid being discharged from inside to outside of the stator part through the penetrating part by rotating at least the rotor out of the rotor and the stator;
• wherein
• a side of the stator part facing to the blades is served as an inner wall surface of the stator part, and a side of the stator part facing to a side opposite to the blades is served as an outer wall surface of the stator part, and
• an opening of each of a plurality of the penetrating parts provided on the inner wall surface of the stator part is served as an inflow opening, an opening of each of a plurality of the penetrating parts provided on the outer wall surface of the stator part is served as an outflow opening, a space between the inflow opening and the outflow opening is served as an inner space of the penetrating part, and the inner space of the penetrating part includes a minimum cross-sectional part whose cross-sectional area is smaller than any other part of the inner space in the middle way from the inflow opening to the outflow opening, wherein
• an opening area of the outflow opening and an opening area of the inflow opening are provided so as to be larger than the cross-sectional area of the minimum sectional-area part of the inner space of the penetrating part.