Patent GB-711904-A (GB)
Title: Improvements in or relating to the supply of scavenging and combustion air to internal combustion engines
IPC: F02B37/10
Filed: 1951-01-24
Abstract: 711,904. Centrifugal blowers; gas turbines; motor power-plant. DOXFORD & SONS, Ltd., W., PURDIE, W. H., and JACKSON, P. Jan. 18, 1952 [Jan. 24, 1951], No. 1870/51. Classes 110(1) and 110(3) [Also in Group XXVII] In an internal-combustion engine of the kind provided with a fuel-control member 12, Fig. 1, movable progressively to increase or decrease the fuel supplied to the engine and having a blower actuated by an exhaust driven turbine for supplying pressure air for super-charging and scavenging, and also employing a source of power, for example steam or air under pressure, external to the engine for supplying the scavenging and supercharging air during slow running, such as experienced during starting, at which the exhaust energy is insufficient to drive the turbo-blower to produce the air required, there is provided an operative connection, for example lever 13 and rod 14. between the member 12, and a control, such as a valve for the steam or air, whereby the supply of the latter is gradually reduced or cut off as member 12 is moved to increase the fuel supply and vice versa. The blower supplies air to the engine 2 through an intercooler 3 and pipe 4 whilst during normal running the exhaust gases are supplied to the turbine through conduits 5 and 6; the steam or air is led to the turbine by conduit 7 which incorporates the valve that is controlled from member 12. The turbine nozzle ring is divided into a number of sections, for example, three, each supplied from one of the conduits 5, 6 and 7. In a modification, the turbo-blower has a separate air or steam turbine mounted on its shaft, the supply of operating medium to which is controlled conjointly with the control member although a separate hand valve is also provided to enable the turbine to operate independently of the engine. In another modification, a separate air or steam motor is coupled to the turbo-blower through a clutch which is conjointly controlled together with the main air or steam valve from the control member; a separate hand valve is also provided for independent motor operation. In a further modification, the turbo-blower is driven from an electric motor through step-up gearing and a clutch, the motor and clutch being conjointly operated from the control member whilst the motor has an additional manual control switch. In another modification, an electrically driven fan 49, Fig. 11, supplies air to the blower intake 50. In addition or alternatively two electrically driven fans 51, 52 supply air to the engine intake whilst non- return valves, connected between the fans and the intake, may be actuated from the control member together with the supply to fans 49 and/or 51, 52 which latter may be started independently of the engine. Where a single fan is used it may be driven by an air or steam turbine or motor or an electric motor to supply air in parallel or series with the main engine blower. The clutches may be operated manually, magnetically, electrically or pneumatically through linkage systems. The compressed air may be obtained from the same source as the starting air i.e. derived from a compressor driven from the engine or an auxiliary engine or motor.