Patent ID: 7976704

Claim:
A filtration device comprising: a filter tank into which a contaminated fluid containing fine particles to be removed is introduced; first and second magnets arranged horizontally spaced apart from each other in the filter tank; and first and second filter media units arranged horizontally adjacent to each other between the first and second magnets, and being subjected to magnetic fields by the magnets, each of the first and second filter media units including a filter media accommodation case and a large number of magnetic granular filter media of a magnetic material contained in the filter media accommodation case, the magnets being movable with respect to the filter media units between a first position and a second position and configured to apply the magnetic field to the magnetic granular filter media, thereby causing the magnetic granular filter media to magnetically attract and fix one another, when in the first position and to cancel the magnetic attraction between the magnetic granular filter media when in the second position, the filter media accommodation case of the first filter media unit including a first nonmagnetic mesh member formed of a horizontal, flat plate of a nonmagnetic material, the first nonmagnetic mesh member supporting the magnetic granular filter media and having a large number of circulation holes through which the contaminated fluid is passable, and a magnetism intensification plate formed of a magnetic material and provided on an end portion of the first nonmagnetic mesh member, the filter media accommodation case of the second filter media unit including a second nonmagnetic mesh member formed of a horizontal, flat plate of a nonmagnetic material, the second nonmagnetic mesh member supporting the magnetic granular filter media and having a large number of circulation holes through which the contaminated fluid is passable, and a magnetism intensification plate formed of a magnetic material and provided on an end portion of the second nonmagnetic mesh member, and the magnetism intensification plates being configured to be located between the first and second magnets when the magnets are in the first position.