Patent GB-788865-A (GB)
Title: Improvements in or relating to dispersing apparatus for control agents
Inventor: MORRIS ALBERTO JORGE
IPC: A01M13/00
Filed: 1955-03-11
Abstract: 788,865. Manure distributers: influencing meteorological conditions. LISTER-TODD ENGINEERING CORPORATION, Ltd. March 12, 1956 [March 11, 1955], No. 7282/55. Classes 6(1) and 6(2). [Also in Group XXIX] In apparatus in which a liquid or solid substance to be sprayed is fed into the hot gas stream emitted from a combustion tube, the combustion tube 12 is fed through a duct 21, Figs. 2 and 3, with a mixture of fuel and compressed air ignited by a spark plug 40, and additional air is fed into an annular passage 24 between the tube and an outer casing 19 and passes into the tube through perforations in a part 23a thereof. The substance sprayed may be a herbicide or insecticide &c. or may be a chemical such as silver chloride used in influencing meteorological conditions. A chamber 14 is attached to the outlet of the tube into which the hot gases flow, and a cupshaped member 45 within the chamber has external swirl-vanes 47 and swirl slots 48 in its wall so that the gases are swirled within the member before leaving the outlet 44. In the embodiment, spray liquid is fed under pressure through a union 55 to the inlet ports 52 of a nozzle 49 in the base of the member 45, and a small passage 57 in a plug 56 allows a small proportion of the hot gases to flow into the axial bore of the nozzle and to mix with spray liquid emitted from radial outlets 53. The apparatus includes an I.C. engine 10, Fig. 1, which drives an air compressor or blower 11, and a pump 59 for supplying spraying liquid from a tank 58 via valves 62, 63 to the chamber 14. The valve 63 allows the pipe between it and the chamber to be cleared by compressed air from the blower, and a pressure-control valve 61 allows excess liquid to flow back to the tank. Air from the blower passes to a casing 15 and swirls around the perforated end 22 of the combustion tube to effect cooling thereof, and some of this air flows into the tube through the perforations 22a and some flows past axial guide vanes 25 to the perforations in the part 23a. The remainder of the air flows through a branch 26, Fig. 2, and about a fuel injector nozzle 30a, and the fuel and air mixture passes from an outlet 32 to a heat exchanger 16 wherein the mixture is vapourized before flowing into the duct 21. The heat exchanger comprises a chamber divided by a heat transfer plate 35, and exhaust gases from the engine 10 flow on one side of the plate and the fuel mixture flows in a sinuous path on the opposite side. Flame traps in the form of perforated plates 39, 41 are provided at the duct 21 and at the combustion tube outlet respectively. The fuel tank 64 is pressurized from the blower and the fuel passes through a filter and a control valve 67 to a regulator and cut-out unit 68 and thence to the fuel injector. The unit 68 reduces the fuel supply in the event of high fuel pressure and cuts off the supply on failure of the ignition. Valves. The unit 68 is fed with liquid fuel via a needle valve 72 and the fuel flows past a normally open valve 82 to an outlet port 89. The valve 82 is urged towards its closed position by a spring 71 and when the fuel supply pressure exceeds a predetermined value it acts through a passage 90 onto a diaphragm 74, to which a plunger 86 is connected, and resultant movement of the plunger allows the valve 82 to move towards its closed position. The end 88 of the plunger touches the end of a bolt 94 on a piston 92 secured to a diaphragm 76 and a space 95 is subjected to the gas pressure within the combustion tube. This pressure is exerted on the diaphragm 76 via passage 96 and the resultant force on the bolt 94 is transmitted to the plunger 86 and holds the valve 82 open. A hand. operable lever engages the end 88 to open the valve 82 for starting purposes. Specification 657,783 [Group XXIX] is referred to.