US1586006A

US1586006A - Device for injecting, pulverizing, and vaporizing fuel in internalcombustion engines

Info

Publication number: US1586006A
Application number: US635788A
Authority: US
Inventors: Rochefort Francois
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-04-30
Filing date: 1923-04-30
Publication date: 1926-05-25
Anticipated expiration: 1943-05-25

Description

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I CHEFORT DEVICE FOR INJECTI PULVERIZING, AND V RIZING FUEL IN IN NAL CO STION ENGI Filed April 1923 Patented May 25, 1926.

UNITED STATES" PATENTOFFICE.

FRANQOIS ROCHEFOBT, OF PARIS, Fm

DEVICE FOR INJ'EG'IEN'G, 1ULVEBIZING,, AND VAPORIZING FUILIN COMBUSTION ENGINES. 7

Application filed'lpril 30, 1923. Serial No. 685,788.

The present invention relates to fuel pulverizing and vaporizing injectors for internal combustion engines, of the type in which the pressure of the liquid fuel itself is l utilized for lifting from its seat the fuel injection valve or the like, which likewise forms the valve for the compressed air or compressed gas serving for the difi'usion of the liquid fuel, by the pressure of the liquid 10 fuel acting upon a piston connected to, and forming part of said needle valve.

The device in accordance with my invention is characterized by the fact that the liquid fuel is admitted by a passage of'very small cross sectional area, between the cylindrical external surface of this needle valve and the cylindrical bore in which the needle valve is displaceable, so as to obtain a constant cross sectional area of passage for the liquid fuel, with a view to ensure its flattening, before its mixture with the diffusing air or other gas under pressure, whatever be the quantity of liquid fuel adupon the verizer comprises two members a and e and the membera is adapted to be mounted in the cylinder head of the engine and terminates in a conical portion a forming a nozzle and comprises internally a cylindri- '40 cal bore a.

I This member a of, the body comprises on one side the inlet d for the su ply of fuel under. pressure, and on the ot er side the inlet c for the supply ofcompressed air.

Within the member a of the body is located the member e, held in place therein by a rin -nut i screwed into t e member a..

7 is member e comprisesa conical seat k and below the-latter a cylindrical bore k.

Within the member '0 is arran d-a needle valve, which comprises a cylin rical art Z",

a conical portion l, corresponding to t eseat k and,.below this conical portion l, is 'arranged a cylindrical member m connected guiding ribs 27*. This stem is hollowed out serves at the same time as a sto ,valve. mitted. The flattening of the liquid fuel which of the obliquity of the grooves in, agyratory therewith and forming a piston the external diameter of which corresponds as accurately as possible to the internal diameter of the cylindrical bore 70 of the member c. It is quite obvious that the members a and e of the body could if desired Be made in one piece although it might be quite impractical, the arrangement as shown having for its object merely to facilitate and show a practical manner "for the manufacture of the body. Upon the periphery of this member m are formed small grooves m, which are sealed by the portion 1 when the latter rests upon its seat It. The needle-valve extends upwards in the form of a stem Z provided with m internally so as to accomodate a spring 11.

which presses at one end upon th bottom of the hollow interior of then le-valve and at the other end upon a plug 0 which for the e needlestem Z in order to. limit rise of I Fuel is delivered through a port d to beneath the piston m; compressed air passes between the ribs 1 to above theportion Z and is held up thereby. An annular groove k is cut in the seat is, to communicate through ports is with grooves is formed in the conical extremity of the member e;

groovesare formed on oblique or helical lines. 4

The operation of this device is as follows: Under the pressureof the fuel delivered by the injection pump, the piston m is lifted raising with it the valve, which is lifted from its seat is. The liquid fuel then travels along the grooves m cut on the external surface of the piston m and into the annular groove is, where it mixes with thecompressed air, admitted by the valve being lifted from its seat, Th s mixture flows through the ports in and the grooves Ii into the nozzle a and assumes as a result motion which produces an intimate mixture 103 of the fluids. The very small quantity of fuel, which may pamf by reason of leakages between the piston m and the cylindrical bore reaches the annular groove is and is carried off by the comp air, and mixes therewith.

When the injection of fuel ceases, the needle-valve is returned to its. seat by the combined action of the compressed air and of the spring 11, or else b the pressure of the compressed air'alone i this be sufiicient. Orifices Z are formed at the lower endof the hollow stem l of the needle-valve in order that fuel ma never be able to 'accumulate therein. rifices 2' formed at the upper part of the stem Z allow the compressed air always to exertits pressure upon the whole area ofthe valve Z so as to'ensure the rapidity of closing of this valve.

What I claim is 1. In a device for injecting, pulverizing and vaporizing fuel for internal combustion en 'nes, comprising a body, outlet in the b0 y, a needle valve member displaceable in the body, separate inlet means 1n the body for supplying fuel and gas under pressure to the needle valve member, which is arranged to control the inlet of both fuel and gas under pressure. and to open communication between the inletsand the outlet through its displacements relatively to the body, means for moving the needle-valve member relatively to the body through pressure exerted by fuel. on the needle-va1ve member to thus allow inlet offuel and gas under pressure, and means for movin the needlevalve member'in the opposite irection for cutting off the inlet of fuel and gas under pressure, the provision of a piston in the body and forming part of the needle-valve member and arranged to receive the pressure of .the liquid fuel under pressure, a cylin-.

drical bore in the body for receiving the piston, and through-way passage means of very small cross sectional area between the piston and the cylindrical bore in the body, for permitting a flow of fuel.

2. In a device for injecting, pulverizing and vaporizing fuel for internal combustion engines, comprising a body, outlet in the body, a needle valve member displaceable in the body, separate inlet means in the body for supplying fuel and gas under pressure to the needle valve member, which is arranged to control inlet of both fuel and gas under pressure and to open communication between the inlets and the outlet through its displacements relatively to the body, means for moving the needle-valve member relatively to the body through pressure exerted by fuel on the needle-valve member and thus allow inlet of the fuel and gas under pressure, and means for movin the needle-valve member. in the opposite irection for cutting off inlet of fuel and gas under pressure, the'provision of a piston in the body forming part of the needle-valve member and arranged to receive the pressure of the liquid fuel under pressure, a cylindrical bore in the body for receivi the piston, the piston having an external. diameter cor-- responding as accurately as possible to the internal diameter of the cylindrical bore in the .body, and small through-way grooves between the piston and the cylindrical bore, for permitting discharge of fuel through the body outlet.

In testimony whereof I have signed my name to this specification.

- FRANQOIS ROCHPFORT.