Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1989-01-18
1992-01-07
Cuchlinksi, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 81R, 277 96, E21B 3300
Patent
active
050784110
ABSTRACT:
A variable magnetic rotary seal sealingly couples a shaft to a housing as the shaft rotates. The variable magnetic rotary seal includes a seal head, a seal ring and a mating ring. The seal head is formed out of a non-magnetic material. The seal head has a first annular surface in the first plane with a circular groove therein and a second annular surface with a plurality of recesses. Each recess has a bottom wall. The sealing ring is disposed in the circular groove and is mechanically coupled thereto. A first "O" ring sealingly couples the seal head to the shaft. The mating ring is formed out of a magnetic, heat-treated and hardened material. The mating ring surrounds the shaft. The mating ring has an annular sealing surface in a second plane which is parallel and adjacent to the first plane. a second "O" ring sealingly couples the mating ring to the housing and secures the mating ring against rotation relative to the shaft. The variable magnetic rotary seal also includes a plurality of separate magnets. Each magnet is disposed in one of the plurality of recesses of the seal head. The seal head draws the sealing ring and the mating ring toward each other so that the annular sealing surface of the mating ring fluidly engages with the sealing ring.
REFERENCES:
patent: 2944843 (1960-07-01), Colby
patent: 3050319 (1962-08-01), Colby
patent: 3080170 (1963-03-01), Colby
patent: 3170409 (1965-02-01), McLeod et al.
patent: 3708177 (1973-01-01), Baerman
patent: 4389051 (1983-06-01), Mullaney
patent: 4669735 (1989-06-01), Sundberg et al.
patent: 4795168 (1989-01-01), Adams et al.
H. Hugo Buchter, Industrial Sealing Technology, 1979 pp. 204-206.
Cuchlinksi, Jr. William A.
DePumpo Daniel G.
Johansen W. Edward
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