Switch arrangement for controlling scroll speed differential of decanter centrifuge - by controlling speed as function of the torque developed between bowl and scroll

摘要

Switch arrangement that impulses proportional to the rotational speeds of the bowl and scroll are generated from probes (3;4) and fed direct to a control unit (2) as the measured value I of the speed differential, and in parallel but after amplification a valve II of the torque as measured by an electronic device (1), that the measured value I is compared with the set point value in the control unit (2), and that the then corresp. analogue difference signal is fed via an amplifier (7) to the inductive coupling (6) which operates in conjunction with both the scroll and the bowl and so continually adjusts in this way any variation of the speed differential between the bowl and the scroll, so that the assigned set-point differential is maintained. USE/ADVANTAGE - Cost effective, low energy consumption differential speed control by torque monitoring.