Imperforate bowl: centrifugal separators – Including plurality of miniature bowls distrubuted about...
Patent
1997-11-07
2000-10-17
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Including plurality of miniature bowls distrubuted about...
494 20, 494 82, 68 232, 74573R, B04B 914
Patent
active
061323543
ABSTRACT:
A ball balancer for minimizing a dynamic unbalance of a moving part of a rotating machine such as a centrifuge is provided. The ball balancer includes a rotary balancer casing having disposed therein balls. The rotary balancer casing is mounted on the moving part coaxially with an axis of rotation thereof and has formed therein an inner side wall which is so curved that the balls are lifted away from the bottom of the balancer casing along the inner side wall by the centrifugal force and biased toward the opposite side of an unbalanced mass of the moving part when the rotational speed of the moving part exceeds a resonant speed that is a rotational speed of the moving part when matched with a natural frequency of the moving part, thereby counterbalancing the unbalanced mass of the moving part. In an alternative form, the balls include a first group having a large diameter and a second group having a small diameter. The large-diameter balls and the small-diameter balls are arranged alternately. Each of the large-diameter balls is lifted on adjacent one of the small-diameter balls by the reaction force produced by a shift in center between one of the large-diameter balls and adjacent one of the small-diameter balls arranged on the bottom of the balancer casing and biased toward the opposite side of the unbalanced mass of the moving part when the rotational speed of the moving part exceeds the resonant speed.
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Ishikawa Mitsuyuki
Ohtsu Shinki
Yoshioka Masanori
Cooley Charles E.
Hitachi Koki Co,. Ltd.
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