Drive system for a water pump with rotatable sealing arrangement

Details Drive system for a water pump with rotatable sealing arrangement Drive system for a water pump with rotatable sealing arrangement

1991-11-27

1994-08-23

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 22, 417 44J, 318127, F04D 1500

Patent

active

053402820

ABSTRACT:
Drive system for a water pump unit (7, 8) driven by the shaft of a reversible motor (4) through a partition wall, about said shaft (5) being mounted a first sealing ring (14) fixed to said wall (13), and a second sealing ring (15) rotatably driven by the shaft and forming a rotatable water-tight sealing arrangement (6) with the first ring (14). The system includes control device (19, 22) capable of normally actuating the motor according to a preset program, and devices (19, 20, 26) to make the motor temporarily oscillate at a predetermined frequency (f), with a sequence of rotations in alternate directions, in case the two sealing rings (14, 15) are sticked together. The oscillation of the rotatable unit associated with the rotor (5) causes the two sealing rings to mutually separate.

REFERENCES:
patent: 3918479 (1975-11-01), Perl
patent: 4885487 (1989-12-01), Ksovreli et al.

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