Waste-oil cleaning apparatus

Apparatus for recovering combustible oil from waste-oil including liquid and solid contaminants, comprising:

• a tank having a top and a base, said base being tapered toward an apex portion thereof;
• an inlet for admitting waste-oil to be recovered into said tank, said;
• an outlet at the apex portion of said tapered base for directly extracting from said tank any liquid contaminants which settle out of waste-oil contained therein;
• a heater for heating any oil in said tank;
• an oil cleaning arrangement outside of said tank for removing particulate material from oil passed through said oil cleaning arrangement, said oil cleaning arrangement including a mesh filter, a magnet located in said mesh filter for extracting metallic particles from said circulating oil, a centrifuge said centrifuge being the only centrifuge in the apparatus and having only one input port, said input port arranged to receive oil to be centrifuged and only one discharge port, said discharge port connected with said tank such that all fluids discharged from said centrifuge are returned to said tank, and a pump for circulating oil through said oil cleaning means, said pump having a suction side and a discharge side;
• said mesh filter in fluid communication on one side thereof with said tank at a point proximate the base thereof and said mesh filter in fluid communication on an opposite side thereof with said pump on the suction side thereof;
• said one discharge port of said centrifuge in fluid connection with said tank at a point thereon above a maximum level for liquid in the tank, and said input port of said centrifuge in fluid communication with said pump on the discharge side thereof;
• and
• said oil cleaning arrangement configured such that, when said tank contains waste-oil, said pump, when operating, causes oil to be extracted from said tank, drawn through said mesh filter and over said magnet therein, passed through said centrifuge, and discharged therefrom only back into said tank.