Sealing arrangement

Details Sealing arrangement Sealing arrangement

1988-10-31

1990-02-20

Look, Edward K.

Expansible chamber devices

Miscellaneous

277 3, F02F 700

Patent

active

049016296

ABSTRACT:
FIG. 1 shows a sealing arrangement which includes a mushroom-shaped piston is driven to reciprocate in a cylinder by an annular driving part extending around its stem. The driving part forms the "rotor" of a linear electric motor, the "stator" of which is provided by the cylinder. The ends of the piston are exposed to respective greater and lesser pressures. During movement of the driving member relative to the piston against the bias of a spring, fluid flow through a passage containing a one-way valve generates an overpressure in a chamber to which a seal between the piston head and the cylinder is exposed and thus prevents leakage of fluid around the seal. FIG. 2 shows a modification in which the piston has a central well containing a plunger biassed by a diaphragm. Here the overpressure is generated in the well and a passage exposes a seal to the overpressure to prevent leakage around the piston.

REFERENCES:
patent: 1694859 (1928-12-01), Laugaudin
patent: 2610098 (1952-12-01), Reiners
patent: 2686402 (1954-08-01), Samuel
patent: 2696197 (1954-12-01), Forwald
patent: 2946318 (1960-07-01), Rutherford
patent: 4569641 (1986-02-01), Falk et al.

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