Positive displacement pump having a ratchet drive guide for disp

Details Positive displacement pump having a ratchet drive guide for disp Positive displacement pump having a ratchet drive guide for disp

1997-10-10

1999-10-12

Freay, Charles G.

Pumps

Motor driven

Fluid motor

92 86, 92 92, 417392, 417478, F04B 4506

Patent

active

059645806

ABSTRACT:
A positive displacement pump includes a deformable hollow member for delivering a subject liquid by a cycle of contraction and restoration of its volume, a casing which contains the hollow member, and a pressurizing device for supplying and evacuating a hydraulic liquid in an annular space between the casing and the hollow member. The supplying of hydraulic fluid causes the contraction of the hollow member, and the evacuating of the hydraulic fluid causes the restoration (expansion) of the hollow member. A guide structure contacts and deforms the outer circumferential portions of the hollow member as the hollow member continues to expand to determine an initial contraction position of the hollow member. That is, a particular direction of contraction of the hollow member is set by the guide structure. Drive means periodically vary the circumferential position of the guide means relative to the hollow member to vary the initial contraction position of the hollow member. Consequently, stresses due to contraction and restoration are dispersed in the hollow member.

REFERENCES:
patent: 2405734 (1946-08-01), Coe
patent: 3048121 (1962-08-01), Sheesley
patent: 3062153 (1962-11-01), Losey
patent: 3442292 (1969-05-01), Jacuzzi et al.
patent: 3684405 (1972-08-01), Wright et al.
patent: 4006260 (1977-02-01), Webb et al.
patent: 4104005 (1978-08-01), Poirier
patent: 4212589 (1980-07-01), Bosio
patent: 4439113 (1984-03-01), Owen
patent: 5209654 (1993-05-01), Lofsjogard Nilsson et al.

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