Pumps – Three or more cylinders arranged in parallel – radial – or...
Patent
1994-01-27
1994-10-25
Bertsch, Richard A.
Pumps
Three or more cylinders arranged in parallel, radial, or...
91478, 91499, F04B 112, F01B 300
Patent
active
053583884
ABSTRACT:
A rotary pump (10) is disclosed of the type including a rotating cylinder block (25) defining a plurality of cylinders (27), each defining an imaginary axis (a), which are uniformly spaced about an axis of rotation (A) of the cylinder block. A piston (29) is disposed for reciprocation within each cylinder (27) as the cylinder block rotates. The housing defines a fluid inlet (43) and a fluid outlet (45). In open communication with each cylinder (27) is a cylinder port (47), disposed for serial communication with the fluid inlet and fluid outlet as the cylinder block (25) rotates. Each cylinder port (47) defines a leading edge (L) which are disposed randomly relative to their respective imaginary axis (a). As a result, the timing of communication between the leading edges of the cylinder ports (47) and the fluid inlet and fluid outlet comprise a non-repetitive pattern, thus substantially reducing the sound level at the second fundamental frequency of the piston frequency, also substantially improving the quality of the sound during operation of the pump.
REFERENCES:
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Malaney David W.
Schutten Herman P.
Wakefield Danny M.
Zimmerer Donald R.
Bertsch Richard A.
Eaton Corporation
Kasper L. J.
Kocharov Michael I.
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