Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1995-10-11
1998-08-18
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
25112921, F02M 5106, F16K 3105
Patent
active
057948607
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fluid injector for delivering a controlled quantity of pressurised fluid and relates particularly, though not exclusively, to a gas injector for delivering a controlled quantity of gaseous fuel to an internal combustion engine.
BACKGROUND TO THE INVENTION
The term "fluid" employed throughout this specification is used in the technical sense of any flowable substance, including a liquid or a gas, even though the description is given primarily with reference to the delivery of gas.
In co-pending International patent application No. PCT/AU92/00575 a Gas Delivery System is disclosed for delivering gaseous fuel to a gas fuelled internal combustion engine. A plurality of gas injectors are employed in the system, for injecting a controlled amount of gaseous fuel into a region adjacent the source of ignition in each cylinder of the engine. The Gas Delivery System is under the control of an engine control unit that directly controls operation of each injector responsive to various operating parameters of the engine, including engine speed and load. The engine control unit calculates an injector ON time for each injector in order to deliver a precisely controlled quantity of gaseous fuel to each cylinder of the engine to achieve optimum engine performance at the current speed and load.
The operating characteristics of prior art fluid injectors were found to be inadequate for the above gas delivery system. In particular, the opening and closing response times of prior art injectors were either found to be too slow or the flow rate capacity was too low for the purpose of delivering a precisely controlled and adequate quantity of gaseous fuel to each cylinder on demand.
Accordingly, the present invention was developed with a view to providing a fluid injector which overcomes at least some of the limitations of prior art injectors.
SUMMARY OF THE INVENTION
According to the present invention there is provided a fluid injector for delivering a controlled quantity of pressurised fluid, the injector comprising: closed to prevent flow of said fluid through the injector, to a second position in which said port is opened to permit a flow of said fluid through the injector, said valve member having a hollow elongate valve stem with an opening proximate both ends to allow a flow of said fluid through the valve stem; to said second position responsive to an electrical control signal whereby, in use, a precisely controlled quantity of said fluid can be delivered by the injector; and, of the valve stem adjacent an end face of the solenoid actuator, said valve stem having a flange of magnetic material provided at said one end which faces the end face of the solenoid actuator and forms an armature of a magnetic circuit formed by the solenoid actuator.
Preferably said solenoid actuator comprises a coil wound about a stationary magnetic core member, said core member having a hollow interior in fluid communication and coaxial with said hollow valve stem whereby, in use, fluid flowing through the injector can help dissipate heat generated by the coil.
Advantageously a non-magnetic separator is provided between an end face of the core member and said annular flange on the valve stem whereby, in use, any residual magnetic force acting on the valve member after said electrical control signal is switched off can be minimized.
Preferably an air gap provided between said annular flange and said end face of the core member is kept to a minimum and is designed to be substantially equal to the distance said valve member is required to be lifted from the valve seat to the second position, plus the thickness of said non-magnetic separator.
The injector preferably further comprises a return spring mounted between said solenoid actuator and valve member and adapted to bias said valve member towards said first position. In the preferred embodiment the injector is provided with an outer casing of magnetic material, a wall of the outer casing being located immediately adjacent said coil an
REFERENCES:
patent: 3241768 (1966-03-01), Croft
patent: 4116389 (1978-09-01), Furtah et al.
patent: 4477027 (1984-10-01), Knapp et al.
patent: 5188336 (1993-02-01), Graner et al.
TK Garrett, "Automotive Fuels and Fuel Systems" vol. 1, published 1991, by Pentech Press (figure 11:36 and associated text, p. 259).
Morris Lesley D.
Transcom Gas Technologies PTY, Ltd.
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