Power plants – Pressure fluid source and motor – Cyclically operable reciprocating or oscillating motor or...
Patent
1997-12-29
2000-09-12
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Cyclically operable reciprocating or oscillating motor or...
F16D 3102
Patent
active
061160253
ABSTRACT:
This pneumatic stroke reversal system for reciprocating, linearly driven pumping units is completely automatic in its cyclic operation, and greatly improves efficiency. A smaller drive motor is required because kinetic energy is stored at the end of each stroke, to be returned to the system to assist in beginning and accelerating the following stroke, and because the smooth and controlled reversals allow a substantially higher stroke velocity and production from a unit of a given size. The reversals are effective on both the upstroke and the downstroke, and their maximum net values are individually selectable over a wide range, and adjustable in the field. The exact points of direction change occur at the instant of maximum rod stretch and maximum rod contraction, respectively, thereby greatly reducing parasitic rod string oscillation, and reducing pressure peaks on, and problems with, the rod string. The subject system is beneficial for long stoke hydraulic pumping units, and it also makes possible very efficient and economical short stroke hydraulic pumping units because of the smaller motor and greater stroke velocity which is made possible. This reversal system is uncomplicated and flexible in its application, requires few moving parts, and can be used in any of a number of embodiments.
REFERENCES:
patent: 2279057 (1942-04-01), Reed
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patent: 4114375 (1978-09-01), Saruwatari
patent: 4347049 (1982-08-01), Anderson
patent: 4571939 (1986-02-01), Dollison
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