| 摘要 |
A mix-in structure for a gas or the like in a pressurization centrifugal pum p, capable of mix-discharging liquid and gas or the like to prevent cavitation and of suppressing gas residence in the pump chamber at the time of operatio n stoppage or the like. It comprises a drum-like case (4) having a suction por t (2) and a delivery port (3), in which opposedly disposed are a vane wheel (5 ) radially formed with a plurality of vanes (19), a pressurization surface (36 ) formed with a compression chamber (33) opposed to the vane wheel (5) and converging from the suction port (2) toward the vanes (19), and pressurizati on section (16) formed with a pressurization partition wall (35) disposed close to the side surfaces of the vanes (19) to prevent leakage of the fluid in th e vane chamber (27), wherein a gas supply device (6) is installed for supplyin g a gas into the suction port (2) by an increase in the liquid pressure in the delivery port (3) by using a pressurization centrifugal pump for pressurizin g the liquid taken in from the suction port (2) in a pump chamber (9) defined by the vane wheel (5) and the pressurization section (16) and delivering it through the delivery port (3).
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