| 摘要 |
<p>1,006,763. Magnetic filters. MULLARD Ltd. April 23, 1964, No. 16875/64. Heading B2J. A magnetic filter e.g. for a closed water system in a power station comprises two gratings 22 of ferromagnetic material (one shown, cut away), one extending across the inlet of a non-ferromagnetic housing, and the other across the outlet, each grating having a plurality of parallel slots 24, a plurality of parallel meshes located between the gratings, each mesh consisting of non-ferromagnetic strips 6 extending at right angles to the gratings and supporting ferromagnetic strips 7 extending at right angles to strips 6 (and preferably at right angles to slots 24), and means for applying a magnetic field between the gratings, such as two permanent magnets having the gratings as pole-pieces. One of these magnets may be reversible, to produce zero field between the gratings, so that auxiliary inlet and outlet ducts may be used for automatic backwashing when interruption of a light path through the meshes or pressure drop across the filter indicates clogging. The auxiliary inlet may be dispensed with, pressure downstream of the filter being used to backwash it into an auxiliary outlet. Electromagnets may be used instead of permanent magnets.</p> |
