High pressure sealing apparatus

Acoustics – Geophysical or subsurface exploration – Seismic wave generation

Patent

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Details

91216B, 92111, 277 53, G01V 104, F01B 1500

Patent

active

041642643

ABSTRACT:
A high pressure seal is formed between a stationary piston and a reciprocating cylinder. The seal includes a sleeve which has an inner diameter dimensioned to permit the cylinder to slide freely over the piston rod, the sleeve being in rigid contact at one end to the cylinder and the other end to an end plate surrounding the piston and closing the end of the sleeve. A bleeder port communicates with the outer surface of the piston rod, through the piston rod, and terminates at a low pressure supply. Bleeder grooves are formed around the inner wall of the sleeve. A first bleeder groove is positioned in the inner wall of the sleeve at the mid-stroke position of the piston with second and third bleeder grooves positioned at each extreme position of the piston stroke in the inner wall of the sleeve. A plurality of pressure drop grooves is formed along the inner sleeve diameter such that the hydraulic fluid passing from the cylinder into the sleeve will gradually drop in pressure as it moves toward the end plate. Pressure relief at the end plate seal is provided by the hydraulic fluid accumulating in the bleeder grooves where it is removed through the bleeder port.

REFERENCES:
patent: 3159233 (1964-12-01), Clynch et al.
patent: 3745885 (1973-07-01), Fair et al.
patent: 4031716 (1977-06-01), Zabcik

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