US1521389A - Liquid-fuel spraying and injecting device - Google Patents

Description

De@7 30 i924.

G. PIELSTHCK LIQUID FUEL SPRAYING AND INJECTING DEVICE Filed April 4, 1922 ,|r". All" Patented Dec. 30, 1924.

lUNITED STATES 1,521,389 PATENT oFFllcE.

GUSTAV PIELSTICK, F AUGSBURG, GERMANY, ASSIGNOR TO THE FIRM'MASC'HINEN- FABBIK AUGSBURG-NUERNBERG AKTIENGESELLSCHAFT, OF AUGSBURG, l GER- MANY, A GERMAN CORPORATION.

LIQUID-FUEL SPRAYING- AND INJECTING DEVICE.

Application led April 4, 1922. Serial No. 549,619.

To all lwhom t mag/concern.

Be it known that lI, GUsTAv PIELSTICK, a citizen of the German Republic, residing at Augsburg, Germany, have invented cer- 6 tain new and useful Improvements in Liquid-Fuel Spraying and In-jecting Devices, of which the following is a specification.

This invention relates to a device for l0 spraying or atomizing liquid fuel and injecting it into the cylinders of internal combustion engines;V It relates more especially to that type of devices in which the fuel is atomized by the action of highly compressed air directly before being injected.

The main object of the invention is to rovide a. simple4 and effective device of the 'nd referred to, in which an improved atomization of the fuel and a thorough mixlo ing of fuel and air may be obtained.

Another object of the invention is to reduce the number of parts to a minimum and to eliminate in particular all such parts which would require individual adjustment w or setting. f I

According to the invention the diffuser cone is made integral with the guide for the needle valve, which guide vis suitably provided with short radial arms serving as 0 distance pieces within the valve casing so that a sleeve-like channel is formed for the passage of the highly compressed. air. Means are provided to cause the compressed air to enter the device so that part of it will 5 force the fuel downwardly in the direction of the valve seat, whilst the remaining part intercepts the fuel at approximately right angles to its direction of flow shortly before it passes the valve seat, thereby causing an Q intense turbulence and an `effective' atomization of the fuel which, according to the invention, is made to enter the device in the immediate proximity of the conical valve seat.

The accompanying drawing shows by way of example a central longitudinal section throu h an injection valve constructed in accordance with the invention.

In this drawing 1 is the valve cage within which the combined needle valve guide and diffuser cone 2 and the needle valvei3 are concentrically arranged. The fuel is admitted through a passage 4. into an annular chamber formed around the diffuser conevin the diffuser.

immediate proximity of the conical valve seat .5. The compressed air enters through a conduit 6 into the sleeve-like passage7 above When the needle valve 3 is lifted, part of the compressed air rushes through the clearance 8 between the diffuser cone and the inner wall of the valve cage, t thereby forcing the fuel which is contained therein downwardly through the gap 9, and past the conical valve seat 5. The remaining part of the 'compressed air enters simultaneously through the drill holes 10 into the hollow 11 formed between the needle valve and the diffuser. From here it rushes e at high velocity through the narrow annular clearance 12 and intercepts the stream of fuel passing at right angles thereto lthrough the gap 9,'whereby the intense impact between the two streams causes an eiective turbulence and, a complete atomization of the fuel. Having passed the valve 5 the mixture of fuel and air passes through the noz` zle plate 13 into the combustion space of the cylinder. A spring 14 is provided to maintain the diffuser in its proper position, whereas short radial arms 15 and 16 near the ends of the valve guide portion serve as vice for internal combustion engines the combination with a needle valve and a diffuser of means to, admit the fuel closely above the valve 'seat and means'to cause the compressed air to partly force the jfuel downwardly through the valve opening and partly, to intercept the stream of fuel at right angles to the direction of its flow below the diffuser and above the valve opening.

2: In a -fuel s rayingL and injecting device for interna combustion engines the combinatlon with a valve cage, a needle valve and a diffuser, of a sleeve-like passage between the diifuserand the valve cage, an annular fuel chamber at the lower end thereof, a fuel passage in communication with said chamber, passages to admit compressed air from above the fuel chamber and passages to divert part ofthe compressed air so as to interceptvthe stream of the-fuel at right angles to the direction of its flow below the diffuser and above thevalve opening.

3. In a fuel spraying and injecting device for internal combustion engines, the combination with a valve cage, a needle valve andav diffuser cone of an annular fuel chamber external of the diffuser cone, 'a-sleeve-like air passage above the said diffuser cone, a narrow annular clearance between the'said fuel chamber and the sleeve-like air passage, a narrow gapbetween the lower end surface ofthe diffuser cone and the valve lcage bottom, a hollow nspace within the diffuser cone encircling the needle valve with a slight clearance at its lower end, and of passages connecting the sleeve-like passage with the said hollow space.' l

4. 'A fuel, spraying and Iinjecting device for internal combustion engines' having in combination a valve cage, a needle'valve, a needle valve guide integral with a diffuser cone, distance pieces for the said guide and diffuser cone within the valve cage, passages including an annular fuel chamber to admit fuel into the device closely above the valve seat,v air passages arranged so as to divert a stream of compressed air to partly act on the fuel level in the annular chamber and partly to intercept the stream of fuel at approximately right angles to the direction of its 'flow at a place intermediate thc annular fuel chamber and the needle valve seat. v

In testimony whereof I have hereunto set my hand, 1n the presence of two subscribing witnesses.

GUSTAV .PIELSTICK Witnesses:

ALEXANDER DE So'ro, ALEXIS v. PHILIPPOFF.

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