Electromagnetically controlled injector having flux bridge and flux break

摘要

An injector for injecting a reagent includes an axially translatable valve member positioned within a housing. An electromagnet is positioned within the housing and includes a cylindrically-shaped coil of wire. The valve member moves between a seated position and an unseated position in response to energizing the electromagnet. A flux sleeve passes through the coil and includes two magnetic portions interconnected by a non-magnetic portion. Each of the magnetic portions is aligned with transverse planes defined by the ends of the cylindrical coil. The non-magnetic portion is axially positioned between the transverse planes.

主权项

1. An injector for injecting a reagent, the injector comprising:
a housing; an axially translatable valve member positioned within the housing; an electromagnet positioned within the housing and including a coil of wire circumscribing at least a portion of the valve member, wherein the valve member moves between a seated position and an unseated position in response to energizing the electromagnet; a flux frame surrounding the coil, the frame including first and second radially extending portions axially spaced apart from one another, extending along substantially parallel planes positioned on opposite sides of the coil; a flux sleeve including two magnetic portions interconnected by a non-magnetic portion, each of the magnetic portions being intersected by one of the planes in which the radially extending flux frame portions lie to define flux bridges, the non-magnetic portion being surrounded by the coil and axially positioned between the parallel planes to define a flux break; and a tubular pole piece disposed within the housing, wherein the pole piece defines a return passageway for reagent to flow when the valve member is at the seated position.