US2552644A

US2552644A - Blending nozzle

Info

Publication number: US2552644A
Application number: US716239A
Authority: US
Inventors: Frank W Ofeldt
Original assignee: Homestead Valve Manufacturing Co
Current assignee: Homestead Valve Manufacturing Co
Priority date: 1946-12-14
Filing date: 1946-12-14
Publication date: 1951-05-15
Anticipated expiration: 1968-05-15

Description

f E x r M m. R. NF 5 E05. 5 w 2 1V9 K rmw Y B Emu wd E M Bwn May 15, 1951 Patented May 15, 1951 BLENDING NOZZLE Frank W. Ofeldt, Carnot, Pa., assignor to Homestead Valve Manufacturing Company, Coraopolis, Pa., a corporation of Pennsylvania Application December 14, 1946, Serial No. 716,239

This invention relates generally to the method and apparatus for controlling the discharge of fluids under pressure and more particularly to spray gun nozzles for controlling a discharge of a spray mixture composed of a liquid'and a vapor of a liquid from the spray generating apparatus.

This invention is an improvement over the invention entitled, Hydraulic System and Nozzle Therefor, disclosed in United States Letters Patent No. 1,958,094, issued May 8, 1934.

Spray generating apparatus with which the spray gun nozzle comprising this invention is particularly adapted comprises a heat transfer means such as a coil to which the liquid spray solution is supplied in metered quantities where it is heated to convert a portion thereof into vapor or steam under pressure to produce a spray mixture composed of liquid and the vapor of a liquid under pressure and the amount of the vapor or steam generated is determined by correlating the amount of heat with the amount of liquid spray solution supplied to the heating coil. Such a spray generating apparatus may be advantageously employed for cleaning or agricultural spraying,

When the spray mixture under pressure is discharged to atmosphere it is atomized and produces a spray for cleaning or a mist, which, if fortified with a chemical such as a germicide, a

. fungicide or an insecticide may be advantageously employed for agricultural spraying or disinfecting. When used for cleaning purposes such a spray usually contains cleaning compounds and is effective as a cleaning agent when the surface to be cleaned is close to the nozzle from which the spray is discharged. However such a cleaning spray is ineffective as a cleaning agent when the surface to be cleaned is a few feet away from the spray gun nozzle.

The principal object of this invention is the provision of a method and apparatus for the discharge of fluid under pressure such as a spray mixture that is eifective as a cleaning agent when the surface to be cleaned is located at a material distance from the spray gun nozzle.

Another object is the provision of a method and apparatus for discharging a liquid under pressure that prevents atomization of the mixture by flashing at the mouth of the nozzle, making the cleaning spray effective at greater distances.

Another object is the provision of a spray gun nozzle for producing a spray stream having asubstantially solid liquid central core.

Another object is the provision of a spray gun 1 Claim. (01. 299140) 2 nozzle thatproduces a concentrated central core of liquid slugs.

Other objects and advantages appear hereinafter in the following description and claim.

A practical embodiment illustrating the principles of this invention is shown in the accompanying drawing wherein:

Fig. 1 is a view in side elevation of the spray gun comprising this invention.

Fig. 2 is a sectional view of the nozzle of the spray gun shown in Fig. 1.

The spray gun shown in Figs. 1 and 2 of the drawing, consists of the nozzle I made up of an outer nozzle member 2 and an inner nozzle member 3. The outer nozzle 2 is provided with a bore 4 of uniform diameter throughout its length. The inner nozzle member 3 is arranged to close the rear end of the bore 4 of the outer nozzle as shown at 5 in Fig. 2. The enlarged head 6 of the outer nozzle 2 is provided with a laterally disposed opening 1 arranged to receive a water supply tube 8. a

The inner nozzle 3 is materially shorter in length than the outer nozzle and is provided with a central 1 bore 9 which is considerably smaller in diameter than the bore 4 of the outer nozzle 2. The bore 9 of the inner nozzle 3 is provided with an outwardly flaring mouth I0 which terminates within the outer nozzle slightly beyond the mouth of the tube 8 where the latter enters the bore 4 of the outer nozzle 2'. The perimetral surface of the inner nozzle 3 is cut away as indicated at H for a length substantially equal to the outwardly flaring mouth L0- to provide the annular chamber l2 between the inner nozzle 3 and the bore 4 of the outer nozzle 2 and into which water may be discharged from the pipe 8.

The rear end of the inner nozzle 3 is provided with a flattened surface I3 preferably disposed at an angle to the axes of the nozzles and is provided with an annular recess l4 surrounding the opening of the bore 9 for receiving the end of the tube 15. The tubes 8 and I5 are disposed parallel with one another. This arrangement of parts provides a convenient spray gun that may be readily manipulated without obstructing the view of the operator and also provides an economical structure due to the manner in which the tubes 8 and I5 are connected to the nozzles.

The nozzles and tubes 8 and [5 may be made of any suitable metal which lends itself to be fabricated as by welding or brazing. The tubes 8 and I5 extend rearwardly of the nozzles to their respective shut-off valve members l6 and 11. The other or inlet side of the valve members l6 and I1 is connected with the tubes I8 and I9 respectively, the ends of which are provided with hose fittings 20 and 2|. A handle 22, made of insulating material such as wood, encircles the intermediate portion of the tube l9 and partially surrounds the water tube 18, being retained (in place fby'the handle strap clamping members '23and '24. The handle 22 is preferably made of considerable length, such as two feet, which permits the gun to be readily manipulated, The tubes 8, l5, l8 and 19 are held in spacedl'elation by means of three spacer blocks "25 distributed therealong. Thus thBflIIDZZlB': 1 together with the strap handle clampsi'zsandjflrmaintain.

the tubes in parallel clamped relation'against the' blocks 25 and provide a unitaryspray-gun structure.

The included angle of the outwardly. .fi'aring. mouth ID of the inner nozzle 3 is approximately fourteen and'one-half degrees. If the bore 4 of the outer nozzle 2 is substantially .five-eighths of an :inch in diameter it should be approximately fourinches longgand the chamber [2 approximately three-fourths of an inch long and the bore .9 of the inner nozzle 3 should be approximately three-sixteenths 'ofuarn' inch in diameter. Ainozzlertof these dimensions is capable of discharging water through the tube 8 at the rate oftapproximately eightgallonsper minute when the spray mixture of liquid "and vapor of a liquid being transmitted-by'the tube l is approximately one; and one-halfagallons ;-per minute at a pressure from one hundred 1302-0118 hundred and fifty pounds ,per square inch and at a water saturation-of from eighty to ninety per cent. vA nozzle. of these :dimensions supplied with such a spray mixture and water, will produce a spray with a; substantially solid liquid core which may be projected against-asurface twenty to thirty feet in the air and produce anefficient cleaning action on the surface. The water being supplied under domestic-pressure and forced into the chamber 1.2 .flows through the bore 4 of the.-outer.n0Z- zle land robs the spray mixture, coming from the. mouthlfl of .the inner nozzle 3, of its latent heat. A sufiicient amount of heat is removed from the spray'm'ixture by the water at this "position within the nozzle to prevent the: spraymixture =ofliquid and vapor. of a liquid from atomizingbyfiashingas it issues from the nozzle and .a stream of considerable force is formed carrying a substantially solid liquid core. which. has-improved erosive force.

If the valve 16 is shut off to prevent further flow of water to the nozzle, the latter will produce a spray, the central core of which contains concentrated water slugs larger than water drops or globules and has excellent cleaning qualities at distances approximating three feet. This improved nozzle will function to discharge an improved cleaning 'vapor spray :mixture Whether 'thewater tube 8' is presenter not.

A nozzle of this character is disclosed in my rec-pending application Serial No. 716,238, filed December 14, 1946.

.Aispraynozzle structure comprising an outer nozzleiclosed'atz one end and having a cylindrical borenf' uniform diameter extending inwardly for itsfulllength from, its open mouth, an inner nozz'le projecting into said closed end and coaxially spaced from the wall of said cylindrical bore to form with said wall an annular rear chamber, anyoutwardly-fiaring; mouth-at the exit end of the inner nozzle, a-conduit to supply a spray mixturev of liquid anda vapor of a liquid under pressure to the bore of the inner nozz1e,and .a second conduit :to supply liquid to said annular rear, chamber, to thereby discharge a spray having a concentrated core of liquid slugs effectiveto clean 'a surface a material distance from .the nozzle.

FRAN. OEELDT.

REFERENCES CITED file of this patent:

STATES PATENTS Number: :Name- Date a 675,840 Phillips June 4, 1901 853,634 Harris .May 1+1, 1907 945,899 Achee. Jan. 11,1910- 1,067,891 Wagner ..-J,ul-y 22, 1913 1,102,329 Dunn July 7., 1914 1,107,244 Carter- Aug. :11, 1,914, 1,153,132 Pettitt. Sept. !7, 1915 1,466,247 Pickop ,-Aug.28, 1923 1,581,018 .Mulroy- .Apr. 1351926 1513595 Herold; Jan; 1 1., .1927 1,739,909 .Negro Oct. 21,193!) 1,800,413 Smith Apr. 14, 193.1; 1,894,829 7 Lay .-Jan...-17, '193.3 1,920,721 f-I-irrell Aug. 1-933 1,958,094 Ofeldt .May, 8 ,1, 1934 2,083,851 Marcy .J,une 15, 1937 2,391,422 Jackson Dec. 25 .1945