Patent ID: 7906021
Filing Date: 2011-03-15
Classification: B01D,B03C

Abstract:
1. A contaminated fluid recovery apparatus comprising: a dirty tank which contains a contaminated fluid; a contaminated fluid supply port through which the contaminated fluid to be decontaminated is discharged into the dirty tank; an exit section located in a position higher than a liquid surface of the dirty tank; a conveyor including a scraper and a chain for scraping out magnetic objects settled on a bottom portion of the dirty tank toward the exit section and including a lower portion which moves from the bottom portion of the dirty tank toward the exit section and an upper portion which passes over the lower portion and approaches a starting end of the lower portion; and a drum-shaped filter unit including a filter drum member disposed in the dirty tank, the filter drum member being located between the lower portion and the upper portion of the conveyor such that an axis extends in a horizontal direction and the axis is perpendicular to a direction of travel of the conveyor, and the apparatus including a drive system which transmits a motion of the chain of the conveyor to the filter drum member, thereby rotating the drum member in association with the conveyor, wherein the filter drum member is a magnet drum comprising a cylindrical outer peripheral surface, an upper fluid guide plate disposed along an upper region of the magnet drum, a lower fluid guide plate disposed along a lower region of the magnet drum, an upper fluid channel defined between the upper fluid guide plate and the magnet drum, the upper fluid channel includes an upper inlet port located at an upper end thereof and extending along the axis (X) of the magnet drum, the contaminated fluid flows along the upper fluid guide plate downward from the upper inlet port toward a lower end of the upper fluid guide plate, a lower fluid channel defined between the lower fluid guide plate and the magnet drum, the lower fluid channel includes an lower inlet port located at an lower end thereof and extending along the axis, the contaminated fluid flows along the lower fluid guide plate upward from the lower inlet port toward an upper end of the lower fluid guide plate, an outlet port located at a confluence of the upper fluid channel and the lower fluid channel, the outlet port opens between the lower end of the upper fluid guide plate and the upper end of the lower fluid guide plate, a magnet is located inside the magnet drum so as to extend along the fluid channels and be fixed relatively to the magnet drum, the outer peripheral surface of the magnet drum includes a magnetic field region which faces the magnet and a nonmagnetic field region which does not face the magnet, and a ridge part which protrudes radially of the magnet drum from the outer peripheral surface of the magnet drum and rotates integrally with the magnet drum, the cylindrical outer peripheral surface of the magnet drum is configured to hold the magnetic objects in the magnetic field region when the ridge part is in the magnetic field region, and the ridge part is configured to force out the magnetic objects toward the nonmagnetic field region when the ridge part is moved in the nonmagnetic field region in a state where the magnet drum rotates.