Pumps – Motor driven – Magnetostrictive chamber
Patent
1986-09-08
1989-01-03
Stout, Donald E.
Pumps
Motor driven
Magnetostrictive chamber
417410, 417505, 310 26, F04B 1700, F04B 3500
Patent
active
047953179
ABSTRACT:
A hydraulic pump having a cylinder closed at one end with an elongated piston arranged within the cylinder from the other end. The piston is constructed of a positive magnetostrictive material which increases in length in the presence of a magnetic field of appropriate intensity. It is wound along its length with a coil of wire capable of producing an electro-magnetic field upon energization. The piston is fastened at the open end of the cylinder to define a cylinder cavity between the cylinder closed end and the piston. A pair of passages including valves, for use as an intake and an exhaust passage, settable as required, communicate with this cavity. The valve members in each cavity comprises a magnetically polarized member, each of opposed polarity as related to the other, such that upon energization of the pump with one polarity of pulses, the valves will assume a particular function, and with a reversed polarity of operating pulses, a reverse function. The volume of this cavity is reduced when the piston expands under the influence of the magnetic field created by the coil to produce a pressure on any fluid contained within said cavity to force it out the exhaust passage. In a preferred embodiment the cylinder is constructed of a negative magnetostrictive material which contracts or shrinks in length in the presence of magnetic field. Thus, in the preferred embodiment, upon energization of the coil, the cylinder's shrinkage and the piston's expansion double the relative movement of the piston force to increase the volume displacement of the pump.
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GTE Valeron Corporation
Koris David J.
Stout Donald E.
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