Patent GB-942993-A (GB)
Title: Improvements in liquid fuel combustion apparatus
Inventor: SCOTT ALEXANDER
IPC: F23K5/02
Filed: 1959-03-23
Abstract: 942,993. Supplying liquid fuel to burners. BRISTOL SIDDELEY ENGINES Ltd. June 20, 1960 [March 23, 1959], No. 10006/59. Heading F4T. [Also in Division F1] A liquid fuel supply system for a combustion apparatus includes a vortex chamber 19 having tangential fuel inlets 18a, 18b and annular fuel outlets 22a, 22b spaced from the axis of the vortex chamber and connected to pipes 23a, 23b leading to two sets of burner nozzles, and a port 20 at the axis of the vortex chamber through which a gas may be supplied, when the flow of fuel is shut off, to purge the vortex chamber, the fuel supply pipes and the burner nozzles of fuel. Fuel is supplied by a pumping and control device 1 to a high pressure fuel cock 3 where it displaces a piston 4 against a spring 5 to uncover a port 6 feeding a pilot burner 8 and later to uncover a port 14 to supply the vortex chamber. The rate of movement of the piston 4 is determined by a bleed orifice 9 in a valve 10 in a conduit 11 leading from the back of the piston to the low pressure side of the pumping and control device 1. The port 14 is connected directly to the tangential inlets 18a of the vortex chamber and to the other tangential inlets 18b through a shut off valve 31 comprising a piston 32 which is a free fit in a cylinder 33. The space above the piston is connected via a constriction 35 and an electromagnetic shut off valve 36 to the low pressure side of the pumping and control device 1. The electromagnetic valve 36 is energized to open position by contacts 39, 40, closed by the power selection lever 37 of the control device 1 when the latter'is set to bring both sets of burner nozzles into operation. The reduction in fuel pressure in the cylinder 33 when the electromagnetic valve is opened allows the piston 34 to move upwardly and open a fuel supply port connected to the tangential inlets 18b. At lower settings of the throttle the contacts 39, 40 are open and consequently only the tangential inlets 18b are supplied with fuel to form a vortex which covers the outer annular outlet 22a but not the inner annular outlet 22b. At maximum throttle opening the vortex covers both annular outlets but does not reach the inlet port 20 for the purging gas. In the fully closed position of the fuel cock 3 the port 14 supplying the vortex chamber and the port 6 supplying the pilot burner are connected so that the purging gas can purge the pipes supplying the vortex chamber through the pilot burner. In a simpler arrangement, Fig. 1 (not shown), for supplying only one set of burner nozzles the vortex chamber has only one set of tangential inlets which are fed directly from the fuel cock 3. In another arrangement, Fig. 4 (not shown), two vortex chambers each having two sets of tangential inlets operated sequentially as in Fig. 3 are provided. The outer annular outlet of the first vortex chamber feeds one set of burner nozzles and its inner annular outlet feeds the second vortex chamber. The outer and inner annular outlets of the second vortex chamber feed a second and a third set of burner nozzles. Specification 942,994 is referred to.