US1795898A

US1795898A - Spray nozzle

Info

Publication number: US1795898A
Application number: US152927A
Authority: US
Inventors: William H Schneider
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-12-06
Filing date: 1926-12-06
Publication date: 1931-03-10
Anticipated expiration: 1948-03-10

Description

March 10, 1931. w. H. SCHNEIDER 1,795,898

' SPRAY NOZZLE Filed Dec. 6, 1926 1 Z 0| 7- I '[6 l 2Q i f.

59 6 INVENTOIR.

.1 wmfi W 2 7 28 I By A TTORNEY.

valve.

Patented Mar. 10, 1931 messes PATENT oFFicE WILLIAM H. SCHNEIDER, F MILWAUKEE, WISCONSIN SPRAY NOZZLE Application. filed December 6,1926 Serial No. 152,927.

. The invention relates tospray nozzles, and more particularly" to spray nozzles for use in connection with carburettors although not necessarily limited thereto. 1

In the-majority of carburettors in use today the, flow of fuel to the mixing chamber or passage is controlled by a nozzle whose dischar e orifice is regulated by a needle hile these needle valves are adjustable, they are generally set to effect a compromise to suit most running conditions of the motor and the result is that the fuel is not'as efliciently sprayed as it should be, which results in imperfect mixing and hence imperfect consumption. -The object of this invention is to improve the nozzle structure ofthe carburettor by providing for a large area of fuel discharge and at the same time cause the fuel to'be discharged in a fine film into the mixing chamber for efficient mixture with the air on its way to the motor. More specifically, the invention consists in a nozzle formed by a coiled spring from whose closely spaced convolutions the fuel enters or is sucked into the mixing chamber,

I preferably a Venturi passage.

; sion hereof. I

I shown in Fig. 1, parts being broken away;

Fig. 3 is a detail view of-a part of the nozzle; I

Fig. 4 is an enl'argedbottom view of the rod shown in Fig. 3; 7

Fig. 5 is a view similar to Fig. 2, showing a modification Fig. 6 is a detail sectional view taken on the line 66 of Fig. 3.

In Fig. 1 I have shown a carburettor having a float chamber 7 into which the fuel is introduced in any suitable manner, the float 8 being operatively connected to the usual supply valve (not shown), said chamher being formed by a topv casing?) and a shell 10 clamped to thetubular extension 11 of said casing by a nut 12. a

The top casing 9 is provided with an air inlet passage 13, a Venturi mixing chamber or passage 14, and an outlet passage 15 having the butterfly throttle control valve 16 mounted therein, the extension 11 having a fuel passage 17 formed therein communicatingbypassages 18 with the interior of the filoat-chamber and conducting fuel to the nozz e.

Thenozzle embodying the invention comprises, in each instance, a coil spring 19, preferably of square or rectangular cross section to present flatdischarge surfaces, and means are provided for holding this spring in operative position at the upper end of the pas sage 17 and so as to extend into the mixing passage 14. While the spring may seat directly upon the upper end of the passage 17, 1 preferably, in eachinstance, secure an annular member 20 to its lower end by soldering it thereto and provide said member with a conical face 21 engageable with a concial seat 22 at the upper end of the passage 17.

Forholdingthe spring 19 in operating position, I have'shown, in Figs. 1 to 4, inclusive, a, rod 23 having a threaded portion 24 engageable in the threaded opening 25 in the cap 26 secured to the casing 9 and provided with a fluted extension 27 of less diameter extending down through the spring and the openingin the member 20 and projecting into the'upper end of the passage 17, said stem having grooves -28,best shown in Fig. 4.

The upper end of the spring 19 is secured, as by soldering, to an apertured or screenlike memberv 29 and a spring 30 is interposed between said disk and a shoulder 31, formed on the rod 23, said spring 30 being soldered to 1 carburettor, as'shown in Fig. 1, turning of the rod in a clockwise direction will shorten the distance between the shoulder 31 and the member 20, the extension 17 being free to move lengthwise therein, with the result that the

springs

19 and 30 are compressed until the coils of the spring 19 are brought so close- 1y together as to leave a very fine helical discharge opening therebetween, with the result that when the fuel is drawn by the suction of the air through the space between the coils it will be discharged therefrom in a thin film that will readily mix with the air passing through the Venturi passage 14. As the springs 19 and balance each other, the dish or member 29 is free to move in the mixing passage, and for any initial setting of the nozzle unit an increase of air supply through a speeding up of the motor will cause an upward movement of the disk 29 with the result that the spring 30 is compressedsomewhat charge opening between the convolutions of the spring, and a decrease in suction will again cause the member 29 to move back to its initial position and thus cut down the effective nozzle discharge opening. Thus, the discharge area of the nozzle may be variedunder varying demands of the motor.

In order, however, to simplify the construction, I may omit the automatic nozzle area regulatin feature by omitting the mem= ber 29 and spring 30, and such aconstruction is shown in Fig. 5, wherein the upper end'of the spring 19 is soldered direct toa shoulder 32 of a rod 33 having athreaded portion 34 which is designed to engage the threaded opening 25 in the same manner as the rod 23, said rod having a fluted extension 35 extending down through the spring and projecting into the upper end of the passage 17fwhen the nozzle is in assembled position in the carburettor, and when sozassembled the spring 19 of the structure shown in Fig. 5 occupies the same position as the similar spring 19 of the unit shown in Fig. 1.

Assuming then that the nozzle shown in Fig. 5 is mounted in the Venturi passage 14, it will be noted that as the air flows up through said passage, under engine suction, fuel from the passage 17 willbe drawn up through the grooves in the fluted extension into the interior of the spring and will then pass through the very narrow but long helical passage formed between the convolutionsof the spring19 and be discharged therefrom into the air in passage, and since the adjustment of the rod 3a in the proper direction serves to d crease the length of the spring the space between the convolutions may be made very fine so that a filnilike dischar e is assured hence the fuel. mines readily. with the. air. Furthermore, as the total length of discharge opening is relatively large, efiicient mixtures are. formed under varying motor-operating conditions since on a decrease of. velocity of air through the passage .14 less the discharge be effective for active fuel discha at higher speeds. In order, however, where conditions require it, to vary the nozzle area ith varying speeds, I have provided the first-described construction.

I desire it to be understood that this invention is not to be limited to any specific form or arrangement of parts except in so far as such limitations are specified in the claims.

What I claim as my invention is:

1. In carburettor, the combination with the mixing passage, of a fuel nozzle comprising, a coiled resilient member for delivering fuel to the mixing chamber, said member having closelyspaced convolutions, and separate means for supplying air to said mixing passage. V

2. In a carburettor, the combination with the mixing passage, of a fuel nozzle comprising a coiled spring. for-delivering fuelitothe 'ng chamber, and means for adjusting said spring to space its convolutions for etficient fuel dlstribution therebetween, and

separate means for supplying air to said mixpassage. 3. In a carburettor, the combination with the Venturi mixin passage, of a coil spring positioned in said passageand'having itsia terior communicating with the fuel supply and its coil closely spacedtoform a' fuel discharge'nozzle, and separate means for supplying air to said Venturi passage.

a. In a carburettor, the combination with if the casing, the Venturi mixing passage, and the fuel supply conduit tosaid'passa'ge, of a spring having a seat member seated on the upper end of said conduit, a rod associated with said spring and adjustably mounted'on said casing to hold said spring in operative fuel nozzle-forming position in said mixing passage, and separate means for supplying air to said mixing'passage.

5. In a carburettor, the combination with V a mixing passage, of-a. coil spring positioned in said passage and'having its inteniorcommunicating with the fuel supply and its coils closely spaced to form a fuel discharge nozzle, means responsive to pressure changes in said chamber for varying the effective length of saidspring to vary its nozzle discharge area, and separate means for supplying air to said mixing passage.

6. In a carburettor, the combination-with the mixing passage, of'a coil spring positioned 1n said passage and hav ng 1ts interior communlcating with the fuel supply. and its coils closely spaced to form a fuel discharge nozzle, means including a shiftabledisk'responsive to pressure changes in saidchamber for varying the effectivelength of said spring to vary its nozzle discharge area,rand separate means for supplying air to saidmixing passage.

In a carburettor, the combination'with the mixing passage, of a coilspring positioned in said passage, a fuel supply conduit communicating directly 'with the interior of said spring, and adjustable spring tensioning-means having a fluted extension fitting within said spring and extending into said conduit.

8. In a carburettor, the combination with the mixing passage, of a coil spring positioned in said passage and having its interior communicating directly with the fuel supply and its coils closely spaced to form a fuel discharge nozzle, a spring, a shiftable disk interposed between said nozzle spring and said last-named spring and responsive to pressure changes in said chamber for varying the effective length of said nozzle spring to vary its nozzle discharge area, and a centering member for said disk and springs.

9. In a carburettor, the combination'with the mixing passage, of a coil spring posi tioned in said passage, a fuel supply conduit communicating directly with the interior of said spring, and adjustable spring-tension ing means having an extension fitting within said spring and provided with a fuel-distributing passage communicating with said conduit. I In testimony whereof, I afi'ix my signature.

WILLIAM I-IJ SCHNEIDER.