Long-life multi-stage ferrofluid seals incorporating a ferroflui

Details Long-life multi-stage ferrofluid seals incorporating a ferroflui Long-life multi-stage ferrofluid seals incorporating a ferroflui

1988-11-04

1989-09-12

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 59, F16J 1540, F16J 1554

Patent

active

048653349

ABSTRACT:
A multi-stage ferrofluid seal incorporates a ferrofluid reservoir for extending seal life. The reservoir is located between seal stages and contains a quantity of ferrofluid sufficient to replace ferrofluid in the seal stages which is lost due to evaporation or contamination. The seal is designed to withstand a pressure drop between a high pressure area and a low pressure area and the location of the reservoir is selected so that the pressure capacity of the seal stages between the low pressure area and the reservoir is sufficient to withstand the entire pressure drop. The pressure capacity of the seal stages between the high pressure area and the reservoir is less than the entire pressure drop. Failure of the seal stages between the reservoir and low pressure area causes failure of the seal stages between the reservoir and the high pressure area. The total failure of all of the seal stages allows fluid to flow through the seal which fluid sweeps ferrofluid from the reservoir into the seal stages between the reservoir and low pressure area. This latter ferrofluid replenishes the ferrofluid in the failed seal stages and restores pressure capacity of the seal. A preferred embodiment is described which utilizes a single pole piece to define the seal stages and the reservoir.

REFERENCES:
patent: 3588124 (1971-06-01), Guinard
patent: 3773336 (1973-11-01), Walter et al.
patent: 4200296 (1980-04-01), Stahl et al.
patent: 4502700 (1985-03-01), Gowda et al.
patent: 4526379 (1985-07-01), Raj

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