| 摘要 |
1. A device for filtering ferromagnetic material from a fluid in which said material is suspended, comprises a cycindrical magnet (2) and a pair of metal plates (5, 6), said magnet (2) having faces (3, 4) of opposite magnetic polarity, said plates (5, 6) being disposed in abutment with said faces (3,4) respectively, each plate having a plurality of recesses (7, 8) about an outer perimeter (9, 10) of each plate (5, 6) to form radially extending magnetic pole pieces (11, 12), which extend beyond an outer perimeter of the magnet faces, said plates (5, 6) being oriented so that the recesses (7) and pole pieces (11) on one plate (5) are axially aligned with those recesses (8) and pole pieces (12) on the other plate (6) , wherein axially opposite recesses (7,8) define passage means for said fluid in an axial direction. 2. A device as in claim 1, characterized in that said device is provided with a means for retaining said recesses (7,8) axially aligned. 3. A device as in claim 1 and 2, characterized in that the outer edges of axially facing pole pieces (11, 12) are curved towards one another. 4. A device as in claim 1 to 3, characterized in that each recess (7, 8) and an outer edge of each pole piece (11,12) is further provided with one or a plurality of slots (15). 5. A device as in claim 1 to 4, characterized in that said device is provided with a distribution plate (21) having a plurality of apertures (24) which are axially alignable with said recesses (7, 8), said apertures (24) being the only passage means of fluid to said metal plates (5, 6). 6. A device as in claim 1 to 5, characterized in that the distribution plate (21), the magnet (2) and said metal plates (5,6) are each provided with an aperture which is adapted to receive a tube (20) through which fluid can pass, said tube is provided with a means for isolating, within the device, fluid passage in the tube from fluid flow through the recesses (7,8). 7. A device as in claim 1 to 6, characterized in that means are provided for ensuring that said recesses (7, 8) and said apertures (24) are maintained in axial alignment. 8. A device as in claim 1 to 7, characterized in that the distribution plate (21) is made of a non-ferromagnetic material. 9. A device as in claim 1 to 8, characterized in that the magnet (2) is made of a material which will generate a magnetic field between the metal plates (5, 6) which is strong enough to attract ferromagnetic material from fluid passing therebetween. 10. A device as in claims 1 to 9, characterized in that the metal plate (5) which is impinged first by fluid flow through the device, is thicker than the other metal plate through which fluid leaves the device. 11. A device as in claims 1 to 10, characterized in that an outer face of the tube (20) is provided with a recess (31) which can receive retaining means (32) which is able to keep the distribution plate (21) in abutment with the axially closer of said metal plates (5). 12. A device as in claims 1 to 11, characterized in that comprises a housing, which is adapted for connecting to the input and output means of the fluid containing means, and also adapted for connecting to a filter of known type comprising a central output passage, whereby said output means from the liquid containing means being continuous with the apertures (24) in the distribution plate (21) and the recesses (7, 8) in the metal plates (5, 6). 13. A device as in claim 1 to 4, characterized in that two distribution plates are disposed either side of each of the metal plates, each distribution plate having a plurality of apertures which are axially alignable with said recesses, said apertures being the only passage means of fluid to said metal plates, the apertures in both distribution plates providing for bi-directional axial flow of fluid. 14. A device as in claim 1 to 10, characterized in that a filter of known type is connected to the magnetic filter, said filter of known type is provided with a passage means for said fluid, successively associated with passing the fluid through slots and apertures of the magnetic filter. |
