GB846752A - Preheater for oil burners - Google Patents

Abstract

846,752. Heating by friction. ROBINSON, T. O. June 24,1957 [June 25, 1956], No. 19821/57. Class 64(2) [Also in Group XXVI] Fuel oil for a burner is preheated by a friction disc 37 having a ring of twelve holes 38 and driven by a shaft 16 of a gear pump on which shaft the disc 37 and a gear wheel 26 are mounted for rotation by the shaft and there may be heat exchange between the oil passing to and from the pump. There may be a further friction disc through which the oil passes as it leaves the pump chamber 2. The shaft 16 passes through central holes in three discs 17, 22, 32 secured by four bolts to the back of the pump housing. A ring 42 screw-threaded on to the outer edge of the gear-housing disc 22 has an internal flange 43 which bears against a disc 39 held from rotation by the engagement of edge notches with pins 36 on the disc 32. The friction disc 37 being sandwiched between the fixed disc 32 and the axiallymovable disc 39, the pressure on it, and therefore the friction produced, may be increased by tightening the ring 42 on the disc 22. The second gear wheel rotates on a pin secured to the back disc 17 and the two wheels, by way of ducts, Fig. 4 (not shown), formed in the rear face of the disc 22, draw oil from the pump chamber 2 through a duct 31, formed by the coincidence of holes each formed in one of the discs 22, 32 and 39, and pass it to an outlet duct formed by a hole 20 in the rear plate 17 and a bore 8 in the back of the pump housing. In the passage to the burner from the bore 8 is a piston valve 10, spring loaded to open under pump pressure and to regulate the outflow. The holes 38 in the rotating friction disc 37 successively coincide with the duct 31 and are not so widely spaced that they ever completely close it. Any oil not passed to the burner may be returned from the chamber 3 of the regulating valve 10 partly to the pump chamber 2 through a duct 12 and partly to the oil tank through another duct in the pump housing 1, Fig. 2 (not shown, but which indicates also two inlets to the chamber 2 of which one may receive oil returned from the burner.