Pumps – Condition responsive control of pump drive motor – Responsive to pump or pump fluid temperature
Patent
1993-07-21
1996-06-11
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Responsive to pump or pump fluid temperature
417244, 417420, 41742311, 41742312, 41742313, 41742314, F04B 4910, F04B 1700
Patent
active
055250394
ABSTRACT:
A pump assembly is disclosed having a housing including a suction inlet and a discharge outlet and a pump assembly contained within the housing. The pump assembly includes a pumping stage and a driving stage, with the pumping stage including an impeller assembly constructed and arranged to impart regenerative action flow to the fluid being pumped. The driving stage includes a magnetic drive comprised of a drive magnet and a driven magnet associated with a shaft operatively coupled to the impeller assembly, with the driven magnet positioned with in a sealed containment vessel. A portion of the pumped liquid is circulated as a coolant through the containment vessel and returned to the pumping stage. A control assembly is provided to monitor the differential temperature of the magnetic drive and the bearing structure within the magnetic drive to control operation of the pump assembly.
REFERENCES:
patent: 3764236 (1973-10-01), Carter
patent: 4932848 (1990-06-01), Christensen
patent: 4943208 (1990-07-01), Schoenwald
patent: 4990057 (1991-02-01), Rollins
patent: 5137418 (1992-08-01), Seighartner
patent: 5201642 (1993-04-01), Hinckley
patent: 5248245 (1993-09-01), Behnke et al.
patent: 5334004 (1994-08-01), Lefevre et al.
patent: 5368446 (1994-11-01), Rode
Bertsch Richard A.
Roy E. Roth Company
Thai Xuan M.
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