Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1993-12-10
1996-05-14
Cummings, Scott W.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277169, 285336, 285918, F16J 1506
Patent
active
055161227
ABSTRACT:
An ultra high vacuum (UHV) joint is scaled by an elastomer O-ring (7) between adjacent flanges (3,4), fitting in a seal cavity formed by grooves (41,42) in the flange (3,4) surfaces. The groove surfaces (41,42) are highly polished and shaped such that the O-ring (7) conforms to the groove surfaces (41,42) and contacts them substantially entirely when the flanges (3,4) are clamped together. This improved structure significantly reduces the permeation through and the gas leakage around the seal (7). The resulting seal (7) can support a vacuum of 10.sup.-11 torr or better. The conformal-groove geometry of the present invention can be used with seals other than elastomer seals, such as soft metal seals (55,65).
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A. Roth: "Vacuum Sealing Techniques"; Jan. 15, 1970; pp. 307, 318-320, 326-330,345-349, 398-399.
H. Hugo Butcher: "Industrial Sealing Technology"; Jul. 23, 1986; pp. 70-82.
"Seals and Sealing Handbook"; Gulf Publ. Co.; Jul. 1, 1986; p. 26.
Berkowitz Edward
Cummings Scott W.
Fishman Bella
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