| 摘要 |
A mixer apparatus for use with a vessel (102) centered about a longitudinal axis is disclosed. The mixer has a tubular blade (106) which: defines a central head axis (H-H); has a first end (120) and a second end spaced from the first end (122) along the head axis; and tapers from the first end to th e second end. The inner surface of the blade and the second end define an insi de blade diameter "ID" and the outer surface of the blade and the first end define an outer blade diameter "OD". The blade is positioned within and coaxial to the vessel. A scotch yoke (144), operatively connected to the bla de by a shaft, effects reciprocating longitudinal movement of the blade through a stroke "S", with a duration "T" for each stroke, wherein 175 >= 0.36 x OD 2 x S/T <= 250 when OD, ID and S are expressed in inches, and T is expressed in seconds.
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