US 5,525,039 AGranted

Hermetically sealed magnetic drive pump

AssigneeRoy E. Roth Company

InventorLeonard J. Sieghartner

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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.

Claims23

Dependent claims

A pump assembly for pumping volatile fluids comprising:

a housing having a suction inlet and a discharge outlet;
a pump assembly contained within said housing, said pump assembly including a pump stage and a drive stage;
said pump stage including an impeller assembly having an impeller member constructed and arranged to impart regenerative turbine flow to the fluid being pumped;
said drive stage including a bearing structure and driven magnet rotating a shaft which is operatively coupled to said impeller assembly to rotate the same;
said drive stage further including a drive magnet for rotating the driven magnet and said shaft, with said driven magnet associated with said shaft and said bearing structure having a sealed containment canister positioned thereabout and sealed to said housing;
with said shaft being operatively connected to said impeller assembly of said pump stage to rotate the same to impact regenerative turbine flow of the fluid through the pump stage;
wherein a portion of said pumped fluid exiting said discharge outlet of said pump stage is circulated through said drive stage to cool and lubricate the same and is returned to said pump stage intermediate said suction inlet and said discharge outlet;
and
including means for measuring the temperature of said bearing structure within said containment canister and the temperature of said containment canister.

6 more elements

Dependencies are inferred from the claim text.