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US 5,701,797 AGranted
Sealing system
AssigneeFramo Engineering AS
InventorFrank Mohn
Life of this patent
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AssigneeFramo Engineering AS
InventorFrank Mohn
Estimating the term…
A piston reciprocally movable within a cylinder is sealed to the cylinder wall by fluid at a pressure greater than those of the fluids on the opposed sides of the piston supplied to the space (18) between two seals (19, 20) operative between the piston and cylinder wall, an accumulator or auxiliary intensifier chamber (67) being provided from which overpressure fluid is supplied to the space between the two seals to regulate the pressure between them. The two seals between the piston and the cylinder wall can be constituted respectively by first (19A-19C) and second (20A-20C) groups or pluralities of separate seal rings selected as regards material and dimensions so as to perform specific functions. Also, a sealing system between a piston and a cylinder within which the piston is reciprocally movable can comprise a forward seal (19, 20), conveniently having two seals or seal ring groups, separating a process or working fluid (4) being moved by the piston, from a second fluid (7) in the space around the piston, and a rearwardly spaced barrier seal (21A-21C) separating the second fluid from a third fluid filling a housing (6) containing a motor by which the piston is driven.
A sealing system for a piston pump comprising a piston rod (5) extending into a cylinder (1) from a motor housing (6), the motor housing containing drive means for reciprocably driving the piston rod, and the cylinder having a piston (2) reciprocable there within, the sealing system comprising a first seal means (19, 20) between the piston and the cylinder for separating a first fluid to be pumped by the piston from a second fluid around the piston rod, and second seal means (21A, 21B, 21C) between the piston rod and the cylinder separating the second fluid from a third fluid in the motor housing, wherein the second seal means comprises a first seal ring (21A), a second seal ring (21B) spaced from the first seal ring on the side thereof remote from the first seal means to define between the seal rings a first chamber (22), a third seal ring (216) spaced from second seal ring on the side thereof remote from the second seal ring to define a second chamber (27) between the second and third seal rings, means (25) for supplying a fourth fluid to the first chamber, and means (27) for maintaining a lower pressure within the second chamber than in the first.
A sealing system for sealing between a fluid-containing cylinder (1) and a piston reciprocably moveable therein, the system comprising first and second sealing means (19, 20) operative between the piston and the cylinder at positions spaced apart along the direction of reciprocable movement, a pressure chamber bounded by the first and the second sealing means, and means (10-12, 14-17) for generating a fluid pressure in the pressure chamber (18) between the first and second sealing means, the piston and the cylinder, in excess of the fluid pressures at the outer sides of the first and second sealing means characterised in that an least one of the first and second sealing means comprises a plurality of seal rings (19A-19C;
A sealing system for sealing between a fluid-containing cylinder (1) and a piston reciprocably movable therein, the system comprising first and second sealing means (19, 20) operative between the member and the cylinder at positions spaced apart along the direction of reciprocable movement, a pressure chamber bounded by the first and the second sealing means, and means (10-12, 14-17) for generating a fluid pressure in the pressure chamber (18) between the first and second sealing means, the member and the cylinder in excess of the fluid pressures at the outer sides of the first and second sealing means, characterised by an accumulator (64) in communication with the space (18) to regulate the pressure therein.
Dependencies are inferred from the claim text.