PUMP AND FINE BUBBLE GENERATOR INCLUDING THE PUMP

PROBLEM TO BE SOLVED: To provide a pump and a fine bubble generator including the pump not deteriorating pump performance and pump efficiency even if a gas-liquid mixed fluid having a high void ratio is sucked. SOLUTION: The pump includes an impeller 3 making fluid flow by being rotatively driven by a motor. The impeller 3 has: a rotating disk 31; a shroud 32; a plurality of main blades 4 arranged between the rotating disk 31 and the shroud 32 at equal intervals along a circumferential direction; and auxiliary blades 5 extending from rear surfaces of the main blades 4 at a rear side in a rotating direction T with respect to the rear side in the rotating direction T. Thereby, when a flow speed at an outer peripheral side is increased and the gas-liquid mixed fluid is made to flow, gas is made to flow to the outer peripheral side of the impeller 3, gas is prevented from being separated from the gas-liquid mixed fluid and remaining at the inner peripheral side of the impeller 3, and the deterioration of the pump performance and pump efficiency is suppressed. COPYRIGHT: (C)2011,JPO&INPIT