Pumps – Condition responsive control of pump drive motor – With control of pump drive transmission
Patent
1998-01-26
2000-08-08
Thorpe, Timothy S.
Pumps
Condition responsive control of pump drive motor
With control of pump drive transmission
417 441, 417 45, 417221, 417326, F04B 4900
Patent
active
06099259&
ABSTRACT:
For a refrigerant compressor having two capacities, a camming structure operable in different manners depending on direction of crankshaft rotation, to achieve each capacity while providing top dead center piston operation thru the use of a circular cam bushing which is eccentrically, rotatably mounted on the crankshaft eccentric and within the connecting rod bearing wherein the combined eccentricities of the bushing and the eccentric equal the primary stroke of the piston. A first stop mechanism is provided for stabilizing the bushing on the eccentric upon rotation of the crankshaft in one direction whereby the eccentricities of the eccentric and bushing become aligned and remain so during synchronous rotational orbiting motion of the eccentric and bushing during rotation of the crankshaft for producing full stroke and full capacity. A second stop mechanism is provided for stabilizing the bushing within the bearing upon opposite rotation of the crankshaft whereby the bushing eccentricity becomes and remains substantially aligned with the connecting rod stroke axis while the eccentric moves alone thru its rotational orbit for producing reduced stroke and reduced capacity. A unique electrical control system is also provided for a reversible electric induction motor for selectively and efficiently driving the compressor crankshaft in either direction for providing the different capacities.
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Product Information, Definite Purpose Controls, Contactors, Starters, 2-Speed Controller, General Electric, GEA-11540B.
Hill Joe T.
Loprete Joseph F.
Monk David T.
Wagner Philip C.
Young Michael R.
Bristol Compressors, Inc.
Gartenberg Ehud
Thorpe Timothy S.
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