Patent Number: 6,168,387

Title: Reciprocating pump with linear displacement sensor

Abstract: A reciprocating pump having an active feedback system is provided. The reciprocating pump includes a reciprocating pump having a pump chamber with a rod reciprocally movable along a longitudinal axis of the pump chamber, with the rod including a ferromagnetic material. An induction coil disposed around the rod wherein relative axial movement between the inductance coil and the ferromagnetic material of the rod varies the inductance of the induction coil. Also provided is a reciprocating pump having an active feedback system in which the rod has an electrically conductive, diametrically tapered portion. A linear displacement sensor is disposed next to the tapered portion which induces a current in the tapered portion and generates an output voltage proportional to a relative position between the linear displacement sensor and the tapered portion.

Inventors: Able; Stephen D. (Bryan, OH), Meloche; Joseph L. (Royal Oak, MI), Schroeder; Gordon M. (New Bavaria, OH)

Assignee: Ingersoll-Rand Company

International Classification: F04B 15/02 (20060101); F04B 15/00 (20060101); F04B 049/00 ()

Expiration Date: 01/02/2018