Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1982-12-07
1984-06-19
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 13, 277 80, F16J 1542
Patent
active
044550260
ABSTRACT:
A combined magnetic/centrifugal seal for a rotating shaft rotatably journalled within a housing. The rotating shaft has a generally circular cross section and at least one radially extending generally Vee-shaped cross section circumferential portion formed about its periphery. A plurality of radially extending circumferential teeth are concentrically arrayed around the periphery of the rotating shaft in parallel relationship to the Vee-shaped circumferential portion on the rotating shaft on at least one of its sides and spaced closely adjacent thereto. The housing has a complementary generally Vee-shaped cross section within which the Vee-shaped circumferential portion of the rotating shaft rides and in conjunction with the Vee-shaped cross section portion defines a space within which the concentrically arrayed circumferential teeth extend. A magnetically susceptible ferrofluid is disposed within this space for forming a centrifugal seal during high speed rotation of the shaft and the ferrofluid communicates with the gaps formed between the ends of the concentrically arrayed circumferential teeth and the opposite surfaces of the rotating shaft on each side of the Vee-shaped cross section circumferential teeth. A magnetic field is impressed across the gaps thus defined to form a plurality of magnetic seal stages with the shaft at standstill and at low rotating speeds.
REFERENCES:
patent: 2665929 (1954-01-01), Sawyer
patent: 3620584 (1971-11-01), Rosensweig
patent: 4200296 (1980-04-01), Stahl et al.
patent: 4304411 (1981-12-01), Wilcock et al.
patent: 4335885 (1982-06-01), Heshmat
patent: 4357024 (1982-11-01), Raj
Pinkus Oscar
Wilcock Donald F.
Claeys Joseph V.
Mechanical Technology Incorporated
Smith Robert I.
Trausch III Arthur N.
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