Magnetostrictive pump with hydraulic cylinder
US4726741A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Oct 14, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/1082
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A magnetostrictive hydraulic pump having a pump cylinder closed at one end with an elongated piston arranged within the cylinder from the other end. The piston is constructed of a magneto-strictive 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 electromagnetic 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, lead to a differential hydraulic actuator, for use as an intake and an exhaust passage to the actuator. The valve members in each cavity comprise a magnetically polarized member, each end of opposed polarity, 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 to ac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.