Patent GB-529209-A (GB)
Title: Improvements in and relating to the reclaiming of oil and the like
IPC: C10M175/00
Filed: 1939-05-24
Abstract: 529,209. Reconditioning used oils. BOULY, H. G. (Hilliard Corporation). May 24, 1939, No. 15456. [Class 91] In apparatus for purifying used lubricating and other oils, the oil passes through a filter into a tortuous path formed by shallow channels in a heated member within a vaporizing chamber connected to a source of suction, and the heating element is arranged to heat the oil before it reaches the filter. For example, oil from a diesel engine is passed through a strainer 8 to a tank 5 from which water and solids settling out are withdrawn through a cock 6 ; the oil is withdrawn through an opening 12 on a flexible pipe 10 supported by a float 11, and taken by a pipe 13 and a valve 15 to a cylinder 16 from which it is forced by a piston 18 past a spring-pressed valve 20 and through a tube 25, a valve 29, a heated coil 30, and a flexible pipe 5U to a filter chamber 31 ; it flows from the filter outlet 38 along a spiral channel formed by baffles 53 on a conical plate 52 heated by an element 69 which also heats the coil 30 and is controlled by a thermostat 70 ; the oil freed from volatiles discharges through a passage 54 to a pipe 55 and a cylinder 57 from which it is pumped past a spring-pressed valve to a pipe 58 leading to the diesel or to a receiver. Conveniently the oil is heated in the coil 30 to 300‹F. and in the vaporizing chamber to 350-400‹F. The volatiles pass through an outlet T to a condensing coil 68 and a tank 67 connected to a suction pump 65 which discharges into a tank 71 open to the atmosphere through a pipe 72 provided with a drain pipe 73. The suction pump is operated from a motor 59 which also drives a fan 60, used to cool the coil 68, and a worm, worm-wheel. and crank disc 61, 62 reciprocating the pistons 18. The pipes 14, 25 are connected by a bye-pass 27 fitted with a relief valve 28 ; and a surge tank 26 is arranged on the pipe 25. The pipe 25 may be branched so that several filtering and vaporizing devices may be used in parallel with the one feed tank 5 and receiving tank 67. The filter chamber 31 is closed airtight by a hinged lid 32; its base 36 is recessed for a screen 37 above the outlet 38, and is corrugated, grooved, or formed with projections 41 ; on them is a layer of canvas 40 clamped to the wall of the chamber 31, a layer of paper 43, a perforated plate 39, fuller's earth 45 with embedded blotting paper 44, a layer of cotton wool 46, and a coarse screen 47, all pressed down by springs 49 or by a weight 48. When the filter material is spent, the oil feed is stopped by closing the valve 15, and a cock 77 on the lid 32 is opened whereby air rushes in and dries the filter ; the motor 59 is then stopped, the lid lifted, and the filter unit removed. A suitable vacuum pump 65 is described comprising inlet and outlet passages to a rotor chamber in which is arranged an eccentrically-mounted rotor having radial spring-pressed vanes and cut-away portions on the side forward of each vane to reduce the load at starting should oil collect in the rotor chamber on standing and become heavy and viscous ; lubricant may be forced to the spindle on each side of the rotor.