Pumps – Three or more cylinders arranged in parallel – radial – or... – Radial cylinders
Patent
1988-10-24
1990-04-10
Smith, Leonard E.
Pumps
Three or more cylinders arranged in parallel, radial, or...
Radial cylinders
417462, 418166, F04B 120
Patent
active
049155962
ABSTRACT:
A pure rotary positive displacement device includes a rotatably mounted circular cylindrical housing having an even number of equiangularly spaced, radial cylinders formed therein. A rotatably mounted piston carrier rotates in synchronization with the cylinder housing and supports at least one piston for movement within the cylinders. The central axis of the piston carrier is offset from the central axis of the cylinder housing, and each piston is spaced from the central axis of the piston carrier by the offset between the rotational axes of the piston carrier and the cylinder housing. The pistons and cylinders preferably have congruent conjugate surfaces to reduce leakage between the pistons and the cylinders, and the pistons are rotatably mounted to the piston carrier. The number of pistons is typically one-half the number of cylinders, and if multiple pistons are used, then they are spaced equiangularly about the piston carrier. When the device is designed to function as a pump or as a compressor, a fluid to be pumped or compressed is admitted to the cylinder housing and is forced from each cylinder as a piston advances toward the distal end thereof. A stationary cylinder head forms a sliding seal with the arcuate peripheral surface of the cylinder housing to exhaust fluid pumped, expanded or compressed by the pistons.
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Wilson, "Positive-Displacement Pumps", Product Engineering, Jun. 6, 1960, pp. 42-51.
Mahanay, "Gerotor Air Motor", Machine Design, Feb. 6, 1986, pp. 75-77.
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