Patent GB-780961-A (GB)
Title: Improvements in or relating to fuel burners
IPC: F23D11/00
Filed: 1953-01-09
Abstract: 780.961. Supplying fuel and air to burners. SCHIELDROP. B. H. Jan. 6, 1954 fJan. 9. 1953: May 13, 1953], Nos. 776/53 and 13436/53. Class 75(1) [Also in Group XXIX] A burner, preferably an oil burner, comprises a first non-rotatable valve member 15 controlling the supply of air through the burner outlet 3 and a second non-rotatable valve member 16 controlling the supply of fuel, each valve member co-operating with a fixed seat on or within the burner casing 1 and the valve members being secured together so that they can be moved together axially of the burner and so that they are relatively adjustable to alter the ratio of fuel to air. The air valve 15 is a tube having a forward end of frusto-conical shape co-operating with the coned forward end 2 of the burner casing 1 to control the flow of air from an air inlet 7 in the casing to the burner outlet 3. The fuel valve 16 is a stem having an elongated V-shaped and V- sectioned groove 25 co-operating with the forward end 26 of a tube 36 supported in the inlet end of a fuel tube 14 extending through the air valve 15 to an oil discharge outlet and supported on a member 34 secured by screws 32 to the rear of the burner casing. The rear end of the fuel valve 16 is connected by a yoke 28 to a rod 27 connected to the air valve 15, the yoke having a clearance about the rod and being clamped in adjusted position thereto by two nuts 29 screwed thereon. The air valve 15 is slidably mounted in a sleeve 19 rotatably but non-slidably mounted in a second sleeve 20 fixed to the casing. A pin 23 secured to the air valve 15 projects through a helical slot 22 in the rotatable sleeve 19 into a longitudinal slot 21 in the fixed sleeve 20. A handle 17 is secured to the rotatable sleeve 19. Fuel is supplied to a channel formed in the burning casing 1 and communicating with each of three sockets therein for receiving the screws 32 which secure the member 34 to the casing and one of the screws is hollow to convey the fuel from the channel through the member 34 to the fuel valve 16. A cylindrical guard 11 is adjustably secured to the front of the burner casing by a thumb-screw 12 and controls the flow of additional air between the burner casing and the furnace wall. In a modified construction the air valve 15 is connected by a link to an eccentric on a shaft rotated by the handle 17 and the seating for the fuel valve is constituted by an annular member which is a loose fit in a recess in the member 34, but is clamped therein when correctly aligned with the fuel valve by the end of the fuel tube 14. In a second modification the air valve is connected by a link to the free end of a lever pivoted about the fuel tube 14, the link being connected to the air valve and to the lever by universal joints. The first Provisional Specification describes burner construction in which the air is swirled by pivoted vanes connected to the air valve so that the amount of swirl varies with the air flow. It also states that the fuel valve may be a coned or needle valve. The second Provisional Specification states that the slot 22, in the rotatable sleeve 19 is so shaped as to produce a small movement of the valves when the valves are closed and a large movement when the valves are open for equal movements of the operating handle. It also describes, a modification of the second modification above in which the lever is pivoted about an axis at right angles to the burner axis and the link is spring loaded.