Solenoid valve with permanent magnet
US6199587A · kind A · utility
Inventors
Key dates
| Filing date | Jul 21, 1998 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Jul 21, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86895
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A solenoid valve comprises a first coil, a plunger, a first and a second opening in the valve, and a latching mechanism placed in association with the first opening. The latching mechanism causes latching, with a predetermined latching force, of the plunger to the first opening, and energization of the first coil along a predetermined first polarity causes at least a reduction of the latching force. The plunger has a first end towards the first opening and a second end towards the second opening, and a magnetic field extensor extends a first pole of the magnetic field produced by the first coil to the first end of the plunger. The extensor comprises a hollow cylindrical ferrous member terminated by a ferrous endpiece and is movable, with the plunger, relative to the first opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.