Reciprocating piston pump system with screw drive

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4276003
SERIAL NO

05961398

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A pump system of the reciprocating piston type is described, which facilitates direct motor drive and cylinder sealing. A threaded middle potion of the piston is engaged by a nut connected to rotate with the rotor of an electric motor, in a manner that minimizes loading on the rotor by the use of a coupling that transmits torque to the nut but permits it to shift axially and radially with respect to the rotor. The nut has a threaded hydrostatic bearing for engaging the threaded piston portion, with an oil-carrying groove in the nut being interrupted. A fluid emitting seal located at the entrance to each cylinder, can serve to center the piston within the cylinder, wash the piston, and to aid in sealing. The piston can have a long stroke to diameter ratio to minimize reciprocations and wear on valves at high pressures. The voltage applied to the motor can be reversed prior to the piston reaching the end of its stroke, to permit pressure on the piston to aid in reversing the motor.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CALIFORNIA INSTITUTE OF TECHNOLOGYPASADENA, CA2320

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Moore, Nicholas R Altadena, CA 1 39
Perkins, Gerald S Altadena, CA 6 166

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