Patent GB-631194-A (GB)
Title: Improvements in or relating to internal combustion generators
IPC: F02K7/00
Filed: 1945-02-23
Abstract: 631,194. Generating combustion products under pressure. MAGILL, H. L. Feb. 23, 1945, No. 1761/47. Convention date, Dec. 30, 1943. Divided out of 631,165, [Group XXXIII]. [Class 51 (i)] [Also in Groups XXVI, XXVII and XXVIII] In an apparatus for generating combustion products under pressure, the combustion chamber is supplied with successive charges of fuel and air mixture which are exploded when the pressure in the chamber reaches a predetermined constant valve, the frequency of the explosions being varied by varying the rate of supply of the mixture. In Fig. 2, the chamber 30 is cooled by pressure air admitted through a pipe 50, the air passing through a throat 96 to mix with the combustion products issuing from the nozzle 93. The air, in passing through the venturi passage 96, effects a scavenging of the chamber 30. The combustible mixture is supplied under pressure through a pipe 45 to the space 92 surrounding a slidable inlet valve 101 having a seat 102 and a central cavity in which is slidably accommodated the outlet valve 103 and a spring 106 which tends to keep both inlet and outlet valves closed. The pressure of the fuel mixture acting on the valve seat 102 and the stepped part 110 of the valve 101 opens the valve and admits mixture to the chamber 30. When the pressure in the chamber rises sufficiently it acts against the valve head and assists the spring 106 to shut the valve and stop the further supply of mixture. The movement of the valve 101 to the right brings the stem 111 thereon, against a switch 130 in the ignition circuit and the sparking-plug 46 ignites the charge. The pressure rises in the chamber 30 until it is sufficient to open the valve 103 by acting on the tapered surface 115 thereof. When the valve is'thus opened, the full pressure can act on the end of the valve and ensure the full opening. Lubricant for the valves is supplied through the pipe 113. The pre-ignition chamber pressure is determined, relatively to the mixture supply pressure by the strength of the spring 106 and the particular stepped formation of the valve 101. A relief valve 120 may be provided, this comprising a valve stem 123 and a head 122 operated manually by a knob 124 or by remote control means consisting of a push button switch 126 and a solenoid 128. The knob 124 is of magnetic material and the remainder of the valve of non-magnetic material. Further cooling air is supplied through the pipe 52 to a jacket 32 surrounding the nozzle 98. The air is supplied from a constant pressure compressed air tank 55 maintained charged by a compressor 56 (see Group XXVIII) driven by an automatically starting and stopping internal combustion engine (see Group XXVII). The tank is connected by a'pipe 36 to a shut off valve 33 having a control handle 72 the shaft of which carries a cam which closes a switch 73 in the ignition circuit when the valve is opened. The compressed air then passes to a feed control valve 35 adjusted by a handle 48 likewise associated with a switch 83 in the ignition circuit. The valve 35 controls the supply of air to pipes 50, 52 leading to the cooling-jackets and to the pipe 45 leading from the carburetter 37 (see Group XXVII) which is supplied with fuel from a tank 38 through a pump 42 and pipes 43.