Patent ID: 7867388

Claim:
A contaminated fluid recovery apparatus comprising: a dirty tank which contains a fluid to be cleaned; an exit section provided in a position higher than a fluid surface ( 0 ) of the dirty tank ; a conveyor having a scraper which scrapes out objects of removal deposited on a bottom portion of the dirty tank toward the exit section and including a lower portion, which moves along the bottom portion of the dirty tank toward the exit section and an upper portion, which moves toward a starting end of the lower portion via a region over the lower portion; a fluid circulating section having an opening which connects the inside and outside of the dirty tank; a sludge removal mechanism including a magnetic drum which is located between the lower portion and the upper portion of the conveyor in the vicinity of the fluid circulating section in the dirty tank and is rotationally driven; fluid surface retainer means which keeps the fluid surface (Q) of the dirty tank in a position higher than the fluid circulating section and the magnetic drum; the magnetic drum is located in a substantially horizontal posture between the lower portion and the upper portion of the conveyor so that an axis (X) thereof extends along the moving direction of the scraper of the conveyor and the entire periphery of the magnetic drum is immersed in the contaminated fluid (D) in the dirty tank; an upper guide plate and a lower guide plate are arranged in the dirty tank, the guide plates are curved in a circular arc so as to extend partially circumiacent the outer peripheral surface of the magnetic drum; an upper fluid passage which communicates with the opening is formed between the upper guide plate and the magnetic drum and a lower fluid passage which communicates with the opening is formed between the lower guide plate and the magnetic drum the contaminated fluid (D) in the dirty tank proceeds toward the opening through the upper and lower fluid passages.