Parameter optimization of the centrifugal juicer with the ball auto-balancer under the impulse change of an unbalance by 3D modeling
DOI:
https://doi.org/10.15587/1729-4061.2017.102241Keywords:
unbalance, auto-balancer, 3D modeling, impulse change of an unbalance, transition processes, centrifugal juicerAbstract
The optimization of the parameters of the centrifugal juicer with the ball auto-balancer under the impulse change of the sieve unbalance at cruising velocity is conducted by 3D modeling. The dependence of the duration of the transition processes on the main parameters of the juicer and the auto-balancer is studied.
Using the example of a two-ball auto-balancer, the impulse changes of an unbalance, which are the most unfavorable for the duration of transition processes, are found: the turn of the unbalance vector around the rotation axis of the rotor by 90° or 180°. In this, the balls pass the longest distance along the running track.
The following is established.
1. The proposed in previous works methods of optimizing the parameters of machines with an auto-balancer for minimization of the duration of transition processes are also efficient under the impulse change of an unbalance at cruising velocity.
2. The previously obtained results are confirmed, namely:
a) the increase of the number of the balls in the auto-balancer leads to the decrease of the duration of transition process; this is explained by the fact, that:
– when there are more than two balls in the auto-balancer, the multi-parameter family of the steady motions appears in the rotor machine;
– under the change of an unbalance, the balls make the transition between the two nearest steady motions;
b) the decrease of the running track radius leads to the decrease of the duration of transition processes; this is due to the fact, that the running track becomes more filled and the balls need to move less between auto-balancing positions;
c) the dependence of the optimal values of the parameters of the centrifugal juicer and the auto-balancer on the magnitude of an unbalance is revealed. The dependence is significant only for the two-ball auto-balancer and weakens with the increase of the number of the balls in the auto-balancer;
d) the use of the two-ball auto-balancer, both in practice and for theoretical and experimental studies of the duration of transition processes in auto-balancing of machines, is inexpedient.
3. It is established that at the centrifugal juicer run-up with the fixed unbalance and under the impulse change of its unbalance at cruising velocity:
– the trends in the influence of the running track radius of an auto-balancer and the number of the balls on the duration of transition processes are identical;
– the optimal values of the main parameters of the auto-balancer and the centrifugal juicer coincide, except for the coefficient of viscous resistance forces of the relative motion of the balls;
– the optimal values of the coefficient of viscous resistance forces of the relative motion of the balls at run-up are less than the corresponding values under the impulse change of an unbalance by 50 %.References
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