Patent ID: 9744505
Date: 2017-08-29
CPC Classifications: B01F

Claim:
1. A stirrer comprising: a shaft disposed at least partially within a medium; a first rotor having a first rotor blade and a second rotor blade each attached to the shaft, wherein the first and second rotor blades are spaced apart from one another about a circumference of the shaft so as to define a gap between the first and second rotor blades, and wherein the first rotor is configured when driven to draw the medium from above the first rotor through the gap between the first and second rotor blades; a second rotor spaced axially along the shaft from the first rotor so as to define an intermediate space between the first and second rotors, the second rotor having a third rotor blade and a fourth rotor blade each attached to the shaft, wherein the third and fourth rotor blades are spaced apart from one another about a circumference of the shaft so as to define a gap between the third and fourth rotor blades, and wherein the second rotor is configured when driven to draw the medium from below the second rotor through the gap between the third and fourth rotor blades; and a first additive outlet opening, defined by the shaft, at the intermediate space between the first and second rotors.