Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1988-06-01
1989-12-26
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 42, 277 93R, 277 27, F16J 1534, F16J 1552
Patent
active
048893501
ABSTRACT:
A bellows seal arrangement (50) seals a rotating shaft (30) passing through a housing wall (32). The seal uses two bellows (56, 58) of different effective diameters (B, C) that are connected in series by a coupling member (60). The series-connected bellows (56, 58) are fixed to the housing at one end and carry a seal insert (54) at the other providing a seal interface with a seal face member (38) rotating with shaft (30). The coupling member has bridging portions (62, 64) extending parallel to the bellows and spaced from respective stop surfaces (66, 68). Both bellows are responsive to the external pressure (P2) and to the internal (shaft side) pressure (P.sub.1). An excess of either pressure causes the larger effective diameter bellows (56) to expand or contract whereby one of the bridging portions (62, 64) abuts its stop surface (66, 68) to render one or other bellows inactive. By selection of the effective diameters (B, C) of the bellows (56, 58) relative to the internal and external diameter (A, D) of the seal interface the seal interface can be doubly-balanced to any desired degree with respect to both the internal (P1) and external (P2) pressures.
REFERENCES:
patent: 1363378 (1920-12-01), Vuilleumier
patent: 3336034 (1967-08-01), Smith
patent: 3713707 (1973-01-01), Bennett
patent: 4202553 (1980-05-01), Kropp
patent: 4240610 (1980-12-01), Trimble
patent: 4415165 (1983-11-01), Martini
patent: 4688806 (1987-08-01), Heilala
patent: 4691276 (1987-09-01), Miller et al.
Cuchlinski Jr. William A.
EG&G Limited
Gutierrez Diego F. F.
LandOfFree
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