Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1980-04-17
1981-12-08
Ward, Jr., Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 13, 277 25, 277135, F16J 1542, F16J 1516
Patent
active
043044115
ABSTRACT:
A magnetic/centrifugal-fluid seal comprising a rotating disk-like collar/vane surrounding a rotatable shaft journalled in a housing defined by close-fitting stationary members forming a cavity to accommodate the rotatable shaft and disk-like collar/vane. A magnetic fluid is retained in a close clearance magnetic gap region between the rotatable shaft and the stationary members and is magnetized by an external permanent magnet or electromagnet. At standstill or low-speed the magnetic fluid is retained by magnetic force in the close-clearance magnetic gap region formed by several sets of opposing pole-like teeth confronting the inner surfaces of the rotating disk-like collar/vane. By virtue of magnetic attraction the magnetic fluid can withstand a pressure drop between high and low pressure regions and thus effects a magnetic seal at standstill and low speeds. As the shaft rotates faster, the magnetic fluid is forced centrifugally from the magnetic seal region and becomes a rotating mass or pool of fluid at the circumferential rim of the disk-like collar/vane. The fluid then acts as a conventional centrifugal seal. When stopping or slowing down, a speed is reached where the magnetic/gravitational forces again dominate over the centrifugal forces and the magnetic fluid returns to the magnetic seal region.
REFERENCES:
patent: 2874982 (1959-02-01), Winther
patent: 2996162 (1961-08-01), Lehde
patent: 3097853 (1963-07-01), McHugh
patent: 3254745 (1966-06-01), Isakov et al.
patent: 3612549 (1971-10-01), Berkowitz
patent: 3620584 (1971-11-01), Rosensweig
patent: 4054293 (1977-10-01), Hoeg et al.
patent: 4200296 (1980-04-01), Stahl et al.
Eusepi Martin W.
Wilcock Donald F.
Claeys Joseph V.
Mechanical Technology Incorporated
Ward, Jr. Robert S.
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