| 摘要 |
A mixing system utilizes up pumping axial flow impellers (14, 16, 18) which entrain gas into the liquid both at the surface (12) and below the surface by induction to draw gas down below the surface where it is dispersed into the circulation produced by the impellers (14, 16, 18). Tubes (48) are disposed on the suction sides of the impeller blades (14, 16, 18), and provide gas outlets near the tips (50) of the blades (14, 16, 18). The tubes (48) may extend along the shaft above the surface or into a hollow shaft having a breathing opening (46) above the surface (12). The rotation of the impellers (14, 16, 18) produces a suction at the tube outlets to draw gas into the liquid while the upward circulation produces surface turbulence for gas entrainment.
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