Rotary mixer, bubble shear filter, ultrafine bubble generation device and ultrafine bubble fluid manufacturing method

A rotary mixer for accelerating a gas-liquid mixed fluid comprising:

• a hollow part formed rotationally symmetrically around a central axis;
• an inflow hole for introducing the gas-liquid mixed fluid into the hollow part;
• a groove having a spiral shape and formed on an inner wall surface of the hollow part, the groove reaching from the inflow hole to a vertex of the hollow part;
• and
• a discharge hole for discharging the gas-liquid mixed fluid in the hollow part to the outside of the hollow part;
• wherein
• a cross-sectional shape of the hollow part cut along the central axis is a convex shape represented by a curved line toward the vertex of the hollow part on the central axis, and
• the inflow hole is inclined relative to a perpendicular line to the central axis along the groove having the spiral shape.

A bubble shear filter including a cylindrical hollow part, an inflow hole for introducing a fluid containing bubbles into the hollow part and a discharge hole for discharging the fluid in the hollow part to the outside of the hollow part comprising:

• a type 1 of plate being a circular plate and arranged inside the hollow part;
• and
• a type 2 of plate being a circular plate and arranged on a downstream side the type 1 of plate;
• wherein
• the type 1 of plate is provided with a plurality of openings,
• the type 2 of plate is provided with a plurality of pointed end portions (mountains) protruding from the downstream side toward an upstream side and a plurality of openings (valleys) surrounded by the adjacent pointed end portions,
• the opening of the type 1 of plate and the opening of the type 2 of plate face each other, and the entire pointed end portion of the type 2 of plate is located downstream of the opening of the type 1 of plate.