Patent GB-431778-A (GB)
Title: Improvements in or relating to means for producing and utilizing a steam jet in heating burners for domestic or other purposes
IPC: F24C5/06
Filed: 1933-12-09
Abstract: 431,778. Wick-burner apparatus. SNELL, C. SCOTT-, East Prawle, Salcombe, Devon, and C.S.S., Ltd., Columbia House, Aldwych, London. Dec. 9, 1933, Nos. 34666/33 and 6138/34. [Class 75 (i)] [See also Group XIII] A liquid-fuel burner for a domestic heater comprises inner and outer wick tubes 31b, 32, Fig. 1, surrounding an adjustable wick 31, a dome or hood 35 having an inclined wall forming with the inner wick tube a narrow passage through which air supplied at greater than atmospheric pressure passes to the inner side of the flame, and a perforated band 34 supported by the outer wick tube limiting the passage of air to the outer side of the flame. The dome 35 is loosely mounted on a vertical cylinder 36 spaced away from the inner wall of the fuel reservoir 30 by brackets 37. The cylinder 36 is formed at its upper end with perforations 39 and communicates at its lower end with a duct 28 connected to a Venturi tube 27 in which an air flow is induced by a jet of steam discharged from a nozzle 6<b>. Additional burners may be supplied with air by the duct 28. The steam supplied to the nozzle 6b is produced in a cylindrical generator 4 formed at its upper end with a dome 6, the cylindrical part being lined with asbestos or other capillary material 7 extending to slightly above the level of a wick burner 2. The wick burner 2 is surrounded by a gallery 22 having a perforated ring 23 admitting air to the flame. The gallery 22 supports a casing 24 and a hood 25 having a perforated opening or gauze 26 allowing the escape of combustion products. Water is supplied through a pipe 15 to the generator 4, the water level being limited by a valve 9 operated by a float 1<a> arranged in a casing 12 having an opening 13 in its upper surface and carried by an apertured tube 14. A relief valve 19 connected by a pipe 20 to the generator 4 allows the water to be driven back into the pipe 15 if the pressure in the generator becomes excessive. Fig. 3 shows a modified generator in which the float valve 1<a> is dispensed with, the main feed watertank 55 being connected to a supplementary tank 56 which communicates by a syphon tube 57 with an air vessel 59 connected to the generator. At starting the syphon tube, which extends above the water level in the tanks 55, 56 is charged with air. When the burner heating the generator is ignited the steam pressure forces the water from the generator up the siphon tube which thus becomes primed so that water is fed to the generator to replace that evaporated. When the burner is extinguished the steam pressure quickly falls and water is fed to the generator more rapidly than it can pass into the tank 56 through the small orifice 62<a> of the pipe connecting the tanks 55, 56. The water continuity from the tank 56 to the generator consequently is broken by air entering the syphon pipe and the flow of water to the generator ceases. Specification 431,849 is referred to. The first Provisional Specification states that the steam generator may be heated otherwise than bv a wick burner and the second Provisional Specification describes a syphon tube feed for the steam generator in which the cock between the main and supplementary water tanks is closed when the steam generator is not being heated.