Patent GB-788161-A (GB)
Title: Improvements in or relating to method and device for feeding burners with liquid fuel
IPC: F23D11/44
Filed: 1954-07-16
Abstract: 788,161. Supplying liquid fuel to burners. BAIER, O., BAIER, W., BAIER, S.. BAIER, L., BAIER, W.. and SCHLUMPRECHT, E., [trading as BAIER KOMM.-GES WEBASTO-WERK, W.]. July 16, 1954 [July 18, 1953], No. 20790/54. Class 75(1) For feeding liquid fuel to a burner from a supply tank to a position at a higher level by a riser which communicates with the supply tank and ends at a higher level or communicates at the higher level with a descending pipe the riser is heated over the area of the liquid standing in it. Fuel supply tank 10 supplied by a level fountain head from a bottle 11, supplies fuel through a tube 14, 3, 15 and 16 to a burner by the ascending portion 15 of the tube being heated by an electric heater 9 so that the fuel leaves the discharge end of the pipe 15 at a level L higher than the level s-s in the tank 10. A vent 5<SP>1</SP> at the discharge end of the pipe 15 prevents siphoning should the end of the pipe 16 terminate below the fuel level s-s in tank 10. In the arrangement shown in Fig. 2 part of the ascending pipe 15 extends into a heating furnace 32 and fuel is supplied to a receiver 20. An overflow pipe 18 returns excess fuel to the tank 10 and cooling fins 19 are attached thereto to avoid excessive heating of the fuel. The pipe 18, Fig. 3 (not shown) may alternatively be connected to the pipe 14 below the valve 17. Fuel is fed through pipes 25, 26 to two porforated tube type burners 30, 31 arranged one above the other. The fuel supply to the pipes 25, 26 is through a chamber 24 and is controlled by nozzles 21, 22 and chamber 24 communicates with the receiver 20 through a pipe 23 to eliminate pressure differences therebetween. The arrangement is such that the lower burner 30 may be continuously operated and when additional heat is required a valve 38 is manually or automatically operated to supply fuel to the burner 31 which is lit by the lower burner 30. Air is fed to the burners 30, 31 through a pipe 28 and the furnace 32 is exhausted through a duct 33. A pipe 36 in a cover 35 on the receiver 20 and a pipe 37 attached to the upper part of the tank 10 may be closed to liquefy the fuel vapours or open and connected to the exhaust duct 33. In the arrangement shown in Fig. 4 fuel is fed to a space in the receiver 20 defined by a wall 46 and the amount of fuel passing to the burner feed pipe 25 through the chamber 24 is determined by the position of a tapered groove 41 formed in the spindle 40 of an adjustable valve member. The pressure balance between the receiver 20 and chamber 42 is obtained through ducts 43, 43<SP>1</SP> in the spindle 40. In the arrangement shown in Fig. 5 the pipe 25 projects into the receiver 20 and terminates in a flexible tube 47 attached to a nozzle 48 which is raised or lowered by a pivoted lever 49 controlled by a manually or thermostatically operated rod 50 to stop the fuel supply to the burner when the nozzle 48 is raised above the fuel level. A pipe 23 is provided to effect pressure equalization before and after the nozzle 48. In a modification shown in Fig. 6 the fuel supply to the burner through the pipe 25 is determined. by the amount allowed to pass through a pipe 52 to the overflow pipe 18 or tank 10 and controlled by a spring loaded valve 51 operated by a thermostat 55 through a pivoted lever 54. Fig. 7 shows an arrangement in which the pipe 15 is arranged in a heating tube 57 of a water heater 58 and fuel is fed from the receiver 20 through a pipe 25 and hollow toroidal evaporator 60 to a nozzle 61. The fuel supply to the burner may be controlled by a nozzle at 62 or 61. Starting is effected by igniting fuel in a cup 64. In a modification, Fig. 8 (not shown). the pipe 15 returns on the outside of the heater 58 and is encased in a heat insulating material adjacent the evaporator 60, heat being conducted to the pipe 15 by a heat conducting body connected thereto and extending into the burner flame. In the arrangement shown in Fig. 9 the fuel tank 10 is placed under pressure by a pump 68 and a member 65, bored and fitted with a tube to form the pipe 15 and embedded in a heat insulating material 66 is heated by the flame issuing from a nozzle 61 so as to feed fuel to a receiver 20 whence it passes to the nozzle 61 under pressure. The fuel enters the pipe 15 through a strainer 74. In a further modification shown in Fig. 10 the pipe 15 is arranged in the central duct of an annular fuel container 10 and is heated by conduction from a bar 65 embedded in heat insulating material 66 and arranged so that the upper end extends into the flame of a perforated tube type burner 30 and the lower end is connected to the pipe 15. The fuel is fed to the receiver 20, attached to the inner perforated wall 71 of the burner 30, and enters the burner 30 through a passage 70 and the vapour enters the burner flame through a passage 72. A wick 73 of asbestos wool or the like retains a certain amount of fuel for starting and serves for uniformly distributing and evaporating the fuel. The receiver 80 shown in Fig. 11 is attached to the tank 10 and is in communication therewith through openings 81, 82 through which fuel passes through a filter 93 to a space 85 containing a throttling and checking device 86. Fuel is normally fed past a valve 87 and through an aperture 92 to the pipe 14 but on rotating a thumb screw 91 the valve 87 cuts off the fuel supply to the pipe 14. In a further modification shown in Fig. 13 the pipe 15 is heated by an electric heater 9 controlled by thermostats 8, 8<SP>1</SP>. The thermostat 8 is located in the flame of an open tray burner 2 and thermostat 8<SP>1</SP> is exposed to room or other temperature. In further arrangements described with reference to Figs. 1 and 14 (not shown) the pipe 15 is placed against the outside of the burner 2 to be heated.