Pumps – Successive stages – Reciprocating rigid stages
Patent
1978-03-07
1980-01-29
Croyle, Carlton R.
Pumps
Successive stages
Reciprocating rigid stages
137512, 417560, 417566, 417571, F04B 300
Patent
active
041859464
ABSTRACT:
A downhole pump has spaced upper and lower pistons connected together by a common rod so that the pistons reciprocate within a cylinder. The cylinder is separated into an upper and lower engine chamber by a frame supported from the cylinder wall and arranged laterally with respect to the longitudinal axial centerline of the connecting rod. A bushing is positioned centrally of the frame and sealingly engages a reciprocating marginal length of the connecting rod. An exhaust port is formed through the frame in spaced relationship to the bushing. A resilient exhaust valve element surrounds the bushing and includes a lower, circumferentially extending edge affixed to the frame outwardly of the exhaust port and further includes an upper seal end which sealingly engages a marginal external surface of the bushing. A lower resilient intake valve element circumferentially extends about the connecting rod in spaced relationship therewith and has an upper end attached to the lower side of the frame and a lower end which sealingly engages the cylinder inner sidewall. This geometrical configuration forms an annulus between the bushing, frame, and upper resilient member, while a lower annulus is formed between the cylinder wall, lower side of the frame, and the lower resilient element. An intake port is arranged for flow into the lower annulus. As the pump reciprocates, fluid flows from outside the pump, through the intake port, into the lower annulus, across the lower seal surface, into the lower cylinder, where the lower piston forces the fluid to flow through the exhaust port, into the upper annulus, and across the seal surface formed between the bushing and the upper end of the exhaust valve element.
REFERENCES:
patent: 1139991 (1915-05-01), Melmore
patent: 2081222 (1937-05-01), Coberly
patent: 2628563 (1953-02-01), Coberly
patent: 2902049 (1959-09-01), Ilfrey et al.
patent: 4032266 (1977-06-01), Roeder
patent: 4084606 (1978-04-01), Mittleman
Bates Marcus L.
Croyle Carlton R.
Look Edward
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