Pumps – Motor driven – Fluid motor
Patent
1994-07-28
1996-07-16
Bertsch, Richard A.
Pumps
Motor driven
Fluid motor
417398, 60372, 60476, F04B 910
Patent
active
055361501
ABSTRACT:
This pumping unit stroke reversal invention can be employed in various embodiments, and uses one or more resilient hydraulic-pneumatic accumulators which slow and stop each stoke, storing the kinetic energy, and returning this energy to begin and accelerate the next succeeding stroke. This storing and re-application of energy greatly increases the efficiency of any pumping unit which incorporates the stroke reversal system of this invention. Counterbalance force is mechanical, hydraulic-pneumatic, or a combination of the two, and is applied in linear or rotary fashion. Drive power is applied during the larger central portion of each stroke, either mechanically or hydraulicly, and in either linear or rotary fashion, and the drive mechanism is then passive during the remaining, reversal portions of the stroke cycle. Pumping units incorporating the subject reversal system are uncomplicated, with a small number of total components, and some embodiments are totally controlled by a single three-position hydraulic valve which can be mechanically operated. Stroke reversal occurs at the instant of maximum rod stretch and maximum rod contraction, respectively, thereby eliminating parasitic rod string oscillation due to reversal, and permitting a higher stroke velocity and increased production from a unit of a given size. A further increase in efficiency is achieved by the smaller drive motor which is sufficient because movement of the system is begun and accelerated by the reversal accumulator.
REFERENCES:
patent: 2956511 (1960-10-01), Morehead
patent: 4099447 (1978-07-01), Ogles
patent: 4114375 (1978-09-01), Saruwatari
patent: 4347049 (1982-08-01), Anderson
patent: 4406597 (1983-09-01), Stanton
patent: 4762473 (1988-08-01), Tieben
patent: 5145332 (1992-09-01), Bohon
Bertsch Richard A.
McAndrews, Jr. Roland G.
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