US2503481A

US2503481A - Atomizing nozzle

Info

Publication number: US2503481A
Application number: US713856A
Authority: US
Inventors: William W Hallinan
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-12-04
Filing date: 1946-12-04
Publication date: 1950-04-11
Anticipated expiration: 1967-04-11

Description

April 11, 1950 w. w. HALLINAN 2,503,481

ATOMIZING NOZZLE Filed Dec. 4, 1946 4 2 Sheets-Sheet 1 45 4 /d g w INVENTOR.

Ap 1950 I w. w. HALLINAN 2,503,481

ATOMIZING NOZZLE Filed Dec. 4, 1,946 2 Sheets-Sheet 2 IN VEN TOR.

Patented Apr. 11, 1950 UNITED STATES PATENT OFFICE ATOIVHZING NOZZLE William W. Hallinan, Racine, Wis.

Application December 4, 1946, Serial No. 713,856

19 Claims.

The present invention relates to atomizing nozzles, and is particularly concerned with an improved element for atomizing nozzles by means of which unobstructed liquid metering grooves of minute and accurate size may be provided so that clogging is avoided, nozzles may be made of smaller capacity, the capacity may be varied according to certain factors, or may be kept subtantially constant, irrespective of the changes in viscosity of the liquid fuel due to changes of temperature.

The adjustable nozzles of the prior art have been limited to use on large burners only; and by large burners I mean those having a burner rate of from ten gallons per hour upward. The nozzles of the prior art having a capacity below the ten gallon per hour rate have such small feeder grooves and whirling chambers that none of them have been satisfactory; and so far as I am aware none are used at the present time.

One of the greatest diificulties in the formation of the feeder grooves lies in the fact that these grooves are cut in the elements of the nozzle according to the prior art; and this cutting operation inevitably forms burs, which must be removed from the grooves or from their proximity because such burs interfere with the flow of oil.

The operation of cutting gooves involves the inevitable formation of such burs, and the burs interfere more with the flow of liquid fuel in the smaller sized grooves than in the larger, Therefore, it has become the practice of nozzle manufacturers to make the grooves fewer in number and larger in size than they should be for perfect oil rotation in the whirling chamber.

It is practically impossible to remove such burs completely, and the number and location and character of the burs varies in each nozzle element havin rooves, so that nozzles of the same size practically never have the same flow capacity, even though they are otherwise of identical construction, because of the burs in the feeder grooves.

It has become necessary in the devices of the prior art to make the feeder grooves larger than necessary so as to pass larger particles of dirt. It has also been customary to provide a long and large whirling chamber with a very small discharge orifice in the devices of the prior art to place a back pressure on these grooves, and this combination of structures naturally reduces the whirling velocity in the whirling chamber.

When such a structure is used in nozzles of less than one gallon per hour capacity, the nozzle will ot break up th oil and will not effect proper atomization. The result is that nozzles of one gallon per hour capacity are rare, and such as may be found are very fragile and are not at all adjustable.

So far as I am aware, the smallest nozzle for residence burners of the high pressure type made at this time has approximately three-fourths of a gallon per hour capacity. Even though some may be marked one-half gallon per hour, when they are tested, I have found them to have a flow rate of about one gallon per hour.

One of the objects of the present invention is the provision of accurately formed grooves of smaller dimension than the devices of the prior art, which may be increased in number, while still making a nozzle of very low capacity by providing grooves which are absolutely free of burs so that there is little or no tendency for the walls of the groove to interfere with the flow of liquid fuel and such fine particles of solids as may be permitted to have access to these grooves.

Another object of the invention is the provision of nozzle elements having burless grooves which may have a taper from the inlet to the outlet, the outlet end being smaller so as to create a nozzle effect in the wirling chamber, thus increasing the rotatin velocity materially.

Another object of the invention is the provision of nozzle elements in which the feeder grooves may be so sized with respect to the size of the discharge orifice that a free flow is permitted through the discharge orifice, which may be made large enough to accommodate the largest flow of the grooves so that, due to the high rotating velocity of the liquid from the whirling chamber, the liquid fuel follows the surface of the discharge orifice and produces a perfectly atomized spray at the lowest capacity.

Another object of the invention is the provision of improved nozzle elements having feeder grooves which are adapted to be manufactured so uniformly that they are interchangeable and so that any of these elements will give the standard of results desired and in which the nozzle elements are made as durable as is necessary for long and effective service under the most adverse conditions.

Another object of th invention is the provision of an improved method of manufacture of nozzle elements of the type having feeder grooves, which produces a superior product, having more desirable characteristics than in the similar nozzle elements of the prior art.

Another object of the invention is th provision of an improved method of atomizing liquid fuel by the use of my improved nozzle elements, which results in a more perfect spray, having a uniform spread and uniform atomization, with minimum possibility of clogging, and with the capability of producing the same result at extremely small capacities, such as one-half gallon per hour.

Another object is an improved method of making nozzle tips, which includes the use of a soft material, such as brass, for the part in which the grooves, whirling chamber, and orifice are formed so that they can be formed by a punching or coining operation, and thereafter coated with a hard layer of chromium plate, thus producing parts of uniform size and characteristics which are interchangeable and which have a long life of use, and which may also be made by tools which will endure for a long life.

Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings, in which similar characters of reference indicate similar parts throughout the several views.

Referring to the single sheet of drawings,

Fig. l is a side elevational view in partial section of an adjustable nozzle unit of the fixed rate of flow type, embodying one of my improved nozzle elements, shown on a plane passing through the axis of the nozzle, with the nozzle adjusted for minimum rate of fiow Fig. 2 is a similar fragmentary sectional view, with the nozzle adjusted for a maximum rate of flow;

Fig. 3 is an elevational view of my improved nozzle element, taken from the right side of Fig. 2, on the plane of the line 3-3, in the direction of the arrows;

Fig. 4 is a view in perspective of the same nozzle element, often referred to as the nozzle tip;

Fig. 5 is a view similar to Fig. 3 of a simpler type of nozzle tip;

Fig. 6 an enlarged fragmentary sectional view, showing the V type shape of groove;

Fig. 7 is a view similar to Fig. 6, showing a half hexagon form of groove;

Fig. 8 is a view similar to Fig. 6, showing a semicircular form of groove.

Fig. 9 is an axial cross-sectional view taken through a cylindrical slug which has been punched out of sheet metal to be used in the formation of a nozzle tip, showing this slug after a preliminary stamping or coining operation which forms a conical depression 44.

Fig. 10 is a similar view Of the blank after it has been subjected to another operation which forms the

grooves

45, 46, rounded surface 61, pointed depression 61a, and conical depression 64a on the opposite side.

Fig. 11 is a similar view showing the blank after the discharge orifice 63 has been drilled.

In order to explain and illustrate the nozzle element to which my invention relates, I have shown in Fig. 1 one complete form of manually adjustable nozzle provided with a nozzle tip embodying my invention.

The nozzle unit is indicated in its entirety by the numeral II], and it preferably includes a housing II, a cap I2, a nozzle tip I3, nozzle plug I4, adjustable plug I5, and filter element I6. The housing II may consist of a substantially cylindrical cast metal body preferably made of a noncorrodible material, such as brass, having an axially extending lug H, which is apertured to pass the cylindrical adjustment shank I8, and

4 provided with an annular recess for receiving a packing, which is compressed by a gland I9.

At one side the housing II has an internally threaded inlet 20 for connection to a pipe introducing liquid fuel under pressure. The filter unit I6 may consist of a metal sleeve having its cylindrical periphery provided with a fine screw thread or ring grooves 2I, and also having axially extending slots 22 extending inwardly from the right and terminating short of the left end to feed the liquid fuel to the grooves between the threads 2 I.

Other axially extending outlet grooves 23 extend inwardly from the left end of the filter sleeve I6 and terminate short of the right end so that liquid fuel entering the channels or grooves 22 must pass through the grooves between the threads 2| to the outlet channels 23, and thence to the open space 24.

At its left end the housing II is internally threaded at 25 for engagement with the complementary threads 26 on the cap I2. The cap I 2 also comprises a substantially cylindrical metal member, the cylindrical wall being indicated at 2], which is also provided with a noncircular projecting portion, such as a hexagonal formation, indicated at 28.

The end of the housing I I abuts against the annular shoulder 29 on the hexagonal formation 28. At its other end the nozzle cap I2 is provided with an enlarged circular opening 30, which is the beginning of a tapered or frusto-conical surface 3|, spreading outwardly and located so that it will clear the spray of atomized fuel, which is thrown by the tip I 3.

The inwardly projecting annular shoulder 32 at the end of the cap I2 serves to engage and confine the nozzle tip I3, which has a sliding fit in the cylindrical bore 33 of the cap 22. The cap I2 is also internally threaded against its right end in Fig. l at 34 for receiving the compillementary external threads 35 on the fixed plug I The fixed plug I4 is formed at its right end with an annular disc 33, having a cylindrical surface 37 that engages the inner cylindrical surface 38 of the filter I6 to close the left end of the filter I6 and cause all liquid fuel to pass through the filter thread or ring grooves from channels 20 to 23.

Toward the left of the disc 36, fixed plug I4 has an annular groove 38, which assures communication between the chamber 24 and a plurality of axially extending grooves 40 in the fixed plug I4. The grooves 46 interrupt the threads 35 of fixed plug I4 and provide communication between chamber 24 and feed chamber 4I formed between the cap I2 and the other reduced cylindrical portion 42 of fixed plug I l.

Fixed plug I4 is provided at its left end (Fig. 1) with a frusto-conical surface 43 of the same angularity as the complementary surface 44 on the nozzle tip I 3 so that, except for the grooves 45-48, Fig. 3, the end 43 of fixed plug I4 provides a liquid-tight engagement with nozzle tip I3 at

surfaces

43, 44. The fixed plug I4 is preferably provided with a pair of opposed fiat surfaces 35a at its right end for application of a wrench or the like in tightening the fixed plug I4 in the cap.

The fixed plug I4 has an internal cylindrical bore 49 adapted to have a sliding fit with the external cylindrical surfaces 50, 52 on the adjustable plug IS. The adjustable plug I5 may have an enlarged threaded portion 53 and a reduced shank l8 which may terminate inside the housing H, being provided with a slot for a screwdriver to effect adjustments, when it has been removed from the housing, or it may be provided with the extended shank l8 projecting out of the housing, and provided with a lever handle 54 for rotating the shank 18, which handle may have suitable indicia in gallons per hour for indicating the flow rate at various adjustments.

In other embodiments of the invention the plug I may be moved axially .by suitable automatic pressure responsive, thermally responsive, or other automatic devices for regulating the rate of flow by means of the position of the adjustment plug l5. v

The left end of the adjustment plug I5 is provided with a frusto-conical surface 55 complementary to the frusto-conical surface 56 on the nozzle tip l3, as best seen in Fig. 2. Inside the frusto-conical surface 55 of the adjustment plug l5 the left end of this plug is formed with a partially spherical depression 5'! centrally located and forming a part of the whirling chamber 58.

The frusto-

conical surfaces

55 and 56 are again of the same angularity adapted to effect a cutoff at the points between these surfaces, except at the grooves 59, 60 formed in the nozzle tip l3.

The nozzle tip I3 is preferably made of some soft metal, such as brass, and it is preferably substantially of circular form comprising a disk of metal having an external cylindrical surface 6| which has a sliding fit in the bore 33 of cap I2. Its outer face 62 may have a plane surface engaging the inner annular shoulder 32 on the cap.

Centrally located of the nozzle tip l3 there is a cylindrical bore 63 terrminating in a frustoconical countersunk portion 64 at the outer face 62. The bore 63 may be drilled in the disk !3, but the rest of the formations on the nozzle tip 53 are preferably made by a coining operation.

on its inner face the nozzle tip it is formed with the frusto-

conical surfaces

56 and 69, forming a conical cavity which is complementary to the end of the plugs I5 and M, respectively. The conical surface 56 may terminate at the point 65 so that the inner face has an annularplane surface 66 outwardly of conical cavity 56. Between the inner conical surface 56 and the cylindrical bore 63 the corner is rounded off at 67? on a curve corresponding to the radius of a circle or some other suitably streamlined curve, so that there is no abrupt shoulder in the nozzle tip aperture at this point.

The nozzle tip which has been selected to illustrate the present invention happens to be of a type having a ring-shaped manifold chamber 63 comprising an annular groove of trapezoidal formation extending axially into the nozzle tip disk 13 concentrically with respect to the discharge orifice 63. This manifold feed chamber communicates on its inner side with the grooves 59 and Bi] which extend tangentially with respect to the outer circle of the rounded portion 6? of the nozzle tip, as shown in Fig. 3, and discharge the liquid fuel into the whirling chamber it in such manner as to cause a rotation in the whirling chamber 16.

As shown in Fig. 2, the grooves 59, 66 are tapered from the ring manifold 68 inwardly toward their inner ends for the purpose of permitting an adjustment of the capacity of these grooves, which is effected by means of the plug [5, as will be further described.

Outwardly of the manifold feed ring 68, the

inner surface of the nozzle tip l3 has the frusto conical surface 69 and the flat surface 66, which may be provided with a plurality of feed grooves 45-48 (Fig. 3), and these feed grooves may also taper in depth from their outer ends toward their inner ends, and they communicate with the annular chamber 4| inside the cap l2 and around the plug M; The grooves 45-48 also preferably extend tangentially with respect to the whirling chamber 10 and are offset radially with respect to the manifold feed chamber 68 so as to cause the liquid to rotate in the ring chamber 68 in the same direction as in the whirling chamber 10.

It should be understood that although only two feed grooves 59 and 60 are shown in the nozzle tip inside the ring 68, three or four, or more, may be used for increasing the capacity, and a greater number of the feed grooves 4548 may be used outside of the ring chamber 68. In other embodiments of the invention the ring chamber 68 may be eliminated, and the nozzle tip merely provided with a plurality of grooves like the grooves 59 and 60 which taper inwardly and conduct fuel from the chamber 4! to the whirling chamber 10, as shown in Fig. 5.

One of the most important features of the invention is the making of the nozzle tip l3. This method preferably comprises the formation of a blank for the disc l3 of relatively soft metal, such as brass, which can be subjected to a stamping or coining operation.

The blank may be formed by punching slugs out of sheet metal, by casting slugs out of molten metal, or by turning the blank out of solid round bar stock.

In order to illustrate the method of making nozzle tips, Fig. 5 shows the simplest type of nozzle tip; and Figs. 9 to 11 show the steps which are taken in making the nozzle tip after the blank has been pnuched out of sheet metal, or made as described.

Fig. 9 is a sectional view, taken through a. blank slug for a nozzle tip, which has been subjected to a first operation by stamping or coining for producing a conical depression forming the conical surface 44.

Fig. 10 shows the same blank after it has been subjected to the next operation, in which a pair of tapered

grooves

45, 46 have been formed by a stamping or coining operation in the conical depressions 44; and the rounded surface 67 joining the frusto-conical surface 44 and the later formed bore 63 have also been formed, terminating in a pointed depression 61a. At the same time the conical depression 64a is. formed on the opposite side, concentrically with the depression tie, the outer portions of the conical depression 64a later forming the conical surface 64.

In the next operation the bore .63 may be formed by a drilling operation, leaving the blank as shown in Fig. 11, after which the nozzle tip is coated with a. hard, durable layer of hard chromium plate.

The grooves which are formed by the stamping or coining operation may be of various cross-sectional shapes, all of which are preferabl tapered downwardly into the body of the nozzle tip in cross-section, so that they may be formed by a die. Examples of these cross-sectional shapes are shown in Figs. 6, 7 and 8.

Fig. 6 shows an enlarged diagrammatic view of the shape of the groove, which may be substantially V-shaped on a suitable anglasuch as, for

example, sixty degrees, with a rounded corner. Fig. '1 shows a groove of hexagonal shape, only three of the sides of the hexagon appearing in the groove. Fig. 8 shows a groove of semi-circular shape.

If the substantiall rectangular shape is emplayed it also preferably has rounded corners, and its sides taper slightly inwardly, as is necessary to permit the withdrawal of the die used for the coining operation. Next the tip i provided with a hard coating.

This may be accomplished by any suitable method, such as electroplating, which will put a hard, uniform layer of chromium on the external surface of the nozzle tip, thus giving it a hard wearing surface which is heat resistive and adapted to increase its life. Such a chromiumplated nozzle tip of soft metal is adapted to have a life which compares favorably with the nozzle tips made by any other method.

By using this method of forming nozzle tips, all machining operations in the formation of feed grooves or any part of the whirling chamber and counterbore are eliminated, and thus there is a complete absence of machine burs which cannot be completely removed in the devices of the prior art having cut grooves and machined whirling chambers and counterbores. Such machine burs and sharp edges cause a difference in the flow rates of the nozzles of the prior art, even when all of the dimensions are held the same, as nearly as possible; and the nozzle tips of the prior art are not interchangeable, particularly in the smaller capacities.

By forming the feed grooves in my nozzle tips by a coining or stamping operation, I am enabled to make extremely small feed grooves of uniform size and shape, completely free of burs, and my nozzle tips are interchangeable.

Another method of making the nozzle tips is by means of die casting the nozzle tips out of suitable die casting metal. In this case finished steel dies would be employed, which would form the nozzle tip in its intermediate condition, as shown in Fig. 10, in one operation. Thereafter the discharge orifice -63 would be drilled, and a coat of hard chromium plate or the like should be applied to the exterior of the die cast nozzle tip, as shown in Fig. 11.

The operation of such a nozzle is as follows:

Liquid fuel passes in at the inlet 2!] in the housing ll under pressure; and it passes from the chamber at the right end into the grooves 22 of the filter member :8. This filter member has threads or rings 2|, which are cut rings or threads made by a machine operation, and which are finer than any feed grooves employed in the nozzle tip or plugs. As the grooves of the thread 2! are finer and smaller than the feed groove of the nozzle tip, they will be adapted to catch any particles of dirt and to filter out all foreign material in the liquid fuel which might clog up the feed grooves of the nozzle.

In addition to this, the machine operation of forming the threads 2| causes the formation of burs and sharp edges, which have a tendency to entrap solid particles.

As the longitudinally extending groove conduits 22 are closed at the left end, the liquid fuel must pass peripherally of the filter IS in the grooves of the thread to the conduits 23 which are closed at the right end in Fig. 1 and extend outwardly at the left end into the chamber 24.

From the chamber 24 the filtered liquid fuel passes axially through the grooves 40 which are cut in the threaded surface of the plug l4, into the annular chamber 4|. Thence the liquid fuel goes inwardly toward the ring chamber I! through the grooves -48.

In the ring chamber 68 the liquid fuel is given a preliminary whirling motion, causing a circulation counter-clockwise in Fig. 3 in the ring chamber 68. From the ring chamber 6-8 the liquid fuel goes into the grooves 59 and 60 which lead to the whirling chamber ill into which the fuel is discharged with a whirling motion.

The plug I4 is threaded home against the frusto-conical surface 69, and therefore eflects a closure except at the grooves 45-48. When adjusted for minimum flow the plug I5 is threaded in a clockwise direction, inwardly and toward the left in Fig. 1, until its frusti-conical surface engages the frusto-conical surface 56 on the no zle tip l3. Then the edge II of the spherical depression 51 on plug l5 defines the cut-off surface, and it is the depth of the grooves 59 and at this point which determines the capacity of the nozzle, as shown in Fig. 1.

In order to increase the capacity of the nozzle, the plug 45 must be retracted by turning the handle 54 counter-clockwise, and when the frustoconical surface 55 registers with the frusto-conical surface 33 on the end of the plug 1 4, the nozzle is opened to a maximum capacity, substantially as shown in Fig. 2. Thus the retraction of the plug l'5 from the grooves 59 and 60 effectively increases the size of those portions of the feed grooves which are utilized.

In addition to this, there is an annular space between the

surfaces

55 and 56 of saucer-like shape, containing whirling liquid fuel feeding into the whirling chamber 10 which increases the rotating velocity.

As distinguished from the devices of the prior art, the present atomizer feed grooves may be made very small, and may be adapted for more perfect oil rotation in the whirling chamber. The devices of the prior art have had to have a fewer number of grooves, and of larger size, to eliminate the trouble which was caused by the burs resulting from machining, which interfered with the flow of oil through them.

The grooves had to be made larger in those prior art devices so as to pass particles of dirt as large as possible, and the whirling chamber had to be made long and large, with a very small discharge orifice, to place a back pressure on these grooves. In a nozzle of less than one gallon capacity per hour such a structure will not atolnize the oil, and the result is that the nozzles of the prior art of less than one-gallon-perhour capacity are very few, and very fragile, and not at all adjustable. The smallest nozzle of the prior art for residence burners of the high pressure type, which I am aware is being manufactured at this time, is approximately three-quarters-gallon-per-hour capacity, and it has a tendency to clog, due to the burs caused by machining operations in the feed grooves.

i may be so sized that a free flow is permitted through the discharge orifice of the nozzle.

The discharge orifice of the nozzle is made large enough to accommodate the largest flow, and because of the high rotating velocity from the whirling chamber the oil is forced to the surface of the discharge orifice 63 and the frustoconical countersunk part 64, which surfaces it follows to produce a perfect frusto-conical spray at the lowest capacity of the nozzle.

The result is more perfect atomization at all capacities, and, in particular, perfect atomization and spray in a frusto-conical form at the very lowest capacity of the nozzle, which may be adjusted in capacity as desired.

It will thus be observed that I have invented an improved fuel nozzle which may be adjusted as to its capacity, and which may be constructed in extremely small sizes. The nozzle tips or other members having feed grooves may be manufactured at a much lower cost than the devices of the prior art, and with greater accuracy, and to closer dimensions, without any burs resulting from machining in the feed grooves, since these feed grooves are formed by a coining or stamping operation.

The structure of my nozzle is so different from the devices of the prior art that an entirely different method of atomization of the liquid fuel takes place in them, which may be described as follows: The liquid fuel is first separated from entrained solid matter or dirt by being passed through relatively fine, machine-cut grooves, having sharp edges and the inherent burs which are formed by such operations so as to entrap and eliminate all solid matter of size larger than the feed grooves of the nozzle.

Thereafter, the liquid fuel passes to an annular chamber in the nozzle cap which communicates with a plurality of feed grooves of smooth, burless and hard-chromium-plated construction, which extend tangentially of a whirling chamber centrally formed in a nozzle tip, the feed grooves tapering toward their discharge apertures into the whirling chamber so as to cause a nozzle effect at the entrance to the whirling chamber. This greatly increases the speed of rotation in the whirling chamber, which is relatively small and which communicates with a discharge orifice of substantially greater size and cross-sectional capacity than the maximum size of discharge of the feed grooves.

The nozzle effect produced at the discharge of the feed grooves into the whirling chamber drives the atomized liquid into engagement with the cylindrical periphery of the enlarged discharge orifice which the atomized fuel engages and follows, continuing to a frusto-conical outer surface, which it also follows at the outer face of the nozzle tip to form a perfect conical spray of atomized fuel under all conditions.

When the capacity adjustment plug is retracted from the nozzle tip, this increases the effective size of the feed grooves at the point of cut-01f H, and, in addition, feeds into the whirling chamber a saucer-like body of rotating liquid fuel, which maintains the high rotating velocity as the discharge capacity increases, the size of the whirling chamber also increasing with the capacity of the feed grooves.

Besides permitting the manual adjustment of the capacity of the nozzle, the present devices may be embodied in nozzles which may vary their capacity with the temperature of the furnace, the pressure of the vapor, or steam in the boiler,

Or the temperature of the water of the boiler; or the capacity of the nozzle may be varied with the pressure of the oil or the temperature of the oil being supplied to the nozzle.

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

1. In an atomizer nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a groove extending from said annular supply chamber to said whirl chamber, and said groove terminating at the edge of said whirl chamber and directing liquid flow in a oncular direction peripherally inside said whirl chamber, said groove tapering to zero depth'at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said groove, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray.

2. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at itsend wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said plug having a through conduit extending from the rear-of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageble with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a groove extending from said annular supply chamber to said whirl chamber, and said groove terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said groove tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said groove, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, said adjustable member when retracted increasing the effective depth of the discharge end of said groove, and augmenting the size of the whirl chamber diameter to form an annular rotating saucer of liquid, the groove portion between the end wall and said plug continuing to direct the liquid peripherally of the whirl chamber.

3. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force -i' following the outer cylindrical surface of the nozzle aperture to form a conical spray.

4. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall memhen-said aperture being formed at its inner end with a convexly curved annular surface formin a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementarysurface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member-having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber,. said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid'flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, the said grooves comprising minute indentations in the surface of one of said members.

5. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the Whirl chamber. and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, the said end wall member comprising a separate disc engaging an annular shoulder in the discharge end of said housing, said disc being removable for inspection and cleaning of its grooves and surfaces.

6. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a conveXly curved amiular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said Whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force followin the outer cylindrical surface of the nozzle aperture to form a conical spray, the engaging surfaces of said end wall member and said other members being frusto-conical, and the grooves being directed longitudinally of the housing as well as peripherally of the whirl chamber.

7. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber. a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, the said housing bore being threaded and the said plug being threaded therein to engage said end Wall member.

8. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, the said housing bore being threaded and the said plug being threaded therein to engage said end wall member, the said plug having a longitudinal external slot forming said conduit to the supply chamber.

9. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end Wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, said nozzle aperture terminating at its outer end in a flaring frusto-conical surface.

10. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end Wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end Wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug,

said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end 1 surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, said adjustable member being threaded into said bore in said plug for gradual axial adjustment by rotation of said adjustable member.

ll. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, said adjustable member being threaded into said bore in said plug for gradual axial adjustment by rotation of said adjustable member, and having a cylindrical shank pro jecting from said housing and provided with an actuating member.

12. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having athrough conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, said central end surface on said adjustable member having a partially spherical depression therein.

13. In an atomizing nozzle, the combination of a housing provided with a circular bore, ending in a cylindrical nozzle aperture at its end wall member, said aperture being formed at its inner end with a convexly curved annular surface forming a forward annular wall of a whirl chamber, a fixed cylindrical plug member in said bore and having a complementary surface engaging said end wall member, said plug and housing bore being shaped to provide an annular supply chamber adjacent the end wall and about the outer end of said plug, said housing and plug having a through conduit extending from the rear of said housing to said annular supply chamber, said plug member having a cylindrical bore, and an axially adjustable member in said bore and having an annular end surface complementary to and engageable with said end wall and also having a central end surface forming the rear wall of said whirl chamber, said end wall member being formed with a plurality of symmetrically located grooves extending from said annular supply chamber to said whirl chamber, and said grooves terminating at the edge of said whirl chamber and directing liquid flow in a circular direction peripherally inside said whirl chamber, said grooves tapering to zero depth at the whirl chamber, and said adjustable member in a minimum position closing communication from the supply chamber to the whirl chamber except through the minimum end of said grooves, the liquid whirling in annular form in said whirl chamber, and due to centrifugal force following the outer cylindrical surface of the nozzle aperture to form a conical spray, the said housing bore being threaded and the said plug being threaded therein to engage said end wall member, and an externally threaded sleeve engaging said plug and engaging the inside of said housing bore, said sleeve having axial slots in its threaded surface to conduct liquid to and from the threaded grooves to filter out solids, said sleeve being urged against said plug by a sprmg.

14. In an atomizing nozzle, a cylindrical housing having an annular shoulder at one open end and a liquid inlet communicating with the other end, said housing having a cylindrical bore, a nozzle tip member located in said bore engaging said annular shoulder, said tip member having a centrally located cylindrical discharge aperture and having an inner frusto-conical surface, a curved flaring surface between said nozzle bore and said frusto-conical surface, said flaring surface forming the outer annular wall of a whirl chamber, a threaded plug member threaded into said housing and having a cylindrical bore, and having an annular frusto-conical end surface engaging said tip member and securing it against said annular shoulder, said nozzle tip member being, formed with inwardly tapering grooves located at its frusto-conical surface and tapering tozerodepth at the edge of said Whirl chamber,

said grooves being symmetrically located and directed with respect to the whirl chamber to direct liquid from the grooves peripherally of the whirl chamber in the same direction, an adjustable cylindrical member located in the bore of said plug and movable axially therein to adjust the volume of discharge, said adjustable member having a frusto-conical end surface complementary to the adjacent frusto-conical surface on the nozzle tip member, the said plug and adjustable member eifffecting a liquid-tight seal against said nozzle tip member except at the tapering grooves when the adjustable member is at its minimum position, the retraction of said adjustable member increasing the effective depth of the inner end portion of said grooves to increase the volume of discharge, to augment the diametrical size of the whirl chambber and to permit the outer portions of the grooves to continue to direct liquid peripherally of the augmented whirl chamber to provide a continuous spray of atomized liquid of the same character istics, but in different volumes, depending on the position of said adjustable member.

15. In an atomizing nozzle, a cylindrical housing having an annular shoulder at one open end and a liquid inlet communicating with the other end, said housing having a cylindrical bore, a nozzle tip member located in said bore engaging said annular shoulder, said tip member having a centrally located cylindrical discharge aperture and having an inner frusto-conical surface, a curved flaring surface between said nozzle bore and said frusto-conical surface, said flaring sur face forming the outer annular wall of a whirl chamber, a threaded plug member threaded into said housing and having a cylindrical bore, and having an annular frusto-conical end surface engaging said tip member and securing it against said annular shoulder, said nozzle tip member being formed with inwardly tapering grooves located at its frusto-conical surface and tapering to zero depth at the edge of said whirl chamber, said grooves being symmetrically located and directed with respect to the whirl chamber to direct liquid from the grooves peripherally of the whirl chamber in the same direction, an adjustable cylindrical member located in the bore of said plug and movable axially therein to adjust the volume of discharge, said adjustable member having a frusto-conical end surface complementary to the adjacent frusto-conical surface on the nozzle tip member, the said plug and adjustable member effecting a liquid-tight seal against said nozzle tip member except at the tapering grooves when the adjustable member is at its minimum position, the retraction of said adjustable member increasing the effective depth of the inner end portion of said grooves to increase the volume of discharge, to augment the diametrical size of the whirl chamber and to permit the outer portions of the grooves to continue to direct liquid peripherally of the augmented whirl chamber to provide a continuous spray of atomized liquid of the same characteristics, but in different volumes, depending on the position of said adjustable member, the nozzle bore in said nozzle tip member terminating at its outer end in a flaring frusto-conical surface adapted to assist in the conical formation of the spray.

16. In an atomizing nozzle, a cylindrical housing having an annular shoulder at one open end and a liquid inlet communicating with the other end, said housing having a cylindrical bore, a nozzle tip member located in said bore engaging 18 said annular shoulder, said tip member having a centrally located cylindrical discharge aperture and having an inner frusto-conical surface, a curved flaring surface between said nozzle bore and said frusto-conical surface, said flaring surface forming the outer annular wall of a Whirl chamber, a threaded plug member threaded into said housing and having a cylindrical bore, and having an annular frusto-conical end surface engaging said tip member and securing it against said annular shoulder, said nozzle tip member being formed with inwardly tapering grooves located at its frusto-conical surface and tapering to zero depth at the edge of said whirl chamber, said grooves being symmetrically located and directed with respect to the whirl chamber to direct liquid from the grooves peripherally of the whirl chamber in the same direction, an adjustable cylindrical member located in the bore of said plug and movable axially therein to adjust the volume of discharge, said adjustable member having a frusto-conical end surface complementary to the adjacent frusto-conical surface on the nozzle tip member, the said plug and adjustable member effecting a liquid-tight seal against said nozzle tip member except at the tapering grooves when the adjustable member is at its minimum position, the retraction of said adjustable member increasing the effective depth of the inner end portion of said grooves to increase the volume of discharge, to augment the diametrical size of the whirl chamber and to permit the outer portions of the grooves to continue to direct liquid peripherally of the augmented whirl chamber to provide a continuous spray of atomized liquid of the same characteristics, but in different volumes, depending on the position of said adjustable member, the said adjustable member being formed in its end with a partially spherical depression, forming the rear wall of the whirl chamber.

1'7. In an atomizing nozzle, a cylindrical housing having an annular shoulder at one open end and a liquid inlet communicating with the other end, said housing having a cylindrical bore, a nozzle tip member located in said bore engaging said annular shoulder, said tip member having a centrally located cylindrical discharge aperture and having an inner frusto-conical surface, a curved flaring surface between said nozzle bore and said frusto-conical surface, said flaring surface forming the outer annular wall of a whirl chamber, a threaded plug member threaded into said housing and having a cylindrical bore, and having an annular frusto-conical end surface engaging said tip member and,securing it against said annular shoulder, said nozzle tip member being formed with inwardly tapering grooves located at its frusto-conical surface and tapering to zero depth at the edge of said whirl chamher, said grooves being symmetricall located and directed with respect to the Whirl chamber to direct liquid from the grooves peripherally of the whirl chamber in the same direction, an adjustable cylindrical member located in the bore of said plug and movable axially therein to adjust the volume of discharge, said adjustable member having a frusto-conical end surface complementary to the adjacent frusto-conical surface on the nozzle tip member, the said plug and adjustable member effecting a liquid-tight seal against said nozzle tip member except at the tapering grooves when the adjustable member is at its minimum position, the retraction of said adjustable member increasing the effective depth of the inner end portion of said grooves to increase the volume of discharge, to augment 'the'diametrical size'of the whirl chamber and'topermit the outer'portions of the grooves to' continue to' direct liquid peripherally of the augmented whirl chamber to provide a continuous spray of atomized liquid of the same characteristics, but in different volumes, depending on the position of said adjustable member, the said grooves comprising minute indentations formed in the surface of said nozzle tip member, said indentations being free of all burs and roughened surface.

18. In an atomizingnozzle, a cylindrical housinghaving' ana'nnular shoulder at one open end and a liquid inlet communicating withthe other end,"said housing having a cylindrical bore, a nozzle tip member located said boreengaging said annular shoulder, said tip member having a centrally located cylindrical discharge aperture and having an inner fru'sto-conical surface, a curved flaring surface between said nozzle bore and said frusto-c'onical surface, said flarin surfacforming the outer annular wall of a Whirl chamber; a threaded plug'member threaded into sa'id'hou's'ing and having a cylindrical bore, and having an'annular frusto 'conica'l end surface engaging'said tip'member and securing it against said annular shoulder, said nozzle tip member being formed with inwardly'tapering'grooves located at its frusto-conical surface and tapering to zero depth at'the' edge' of s'aid whirl chamber,

said'grooves being symmetrically located and directed with respect to the'w'hirl chamber to direct liquid from the'grooves peripherally of the whirl chamber in thejsame' direction, and adjustablecylindrical memberlocated in the bore 2;

todirect'liquid peripherally of the augmented whirl chamber to provide a continuous'spraypf atomized liquidof the same characteristics, but indifferent volumea'depe'nding on the position of said adjustable member, said nozzle tip member being formed with an annular'groove, the inner wall of which is 'substantiallyin alignment with the periphery of said adjustable member and having a, plurality ofadditional outwardly extending grooves in said nozzle tip member adjacent'said plug member.

19. In an atomizin'g'nozzle, a cylindrical housing having an annular shoulderat one open end and a liquid-inlet communicating with the outer end, said housing having a cylindrical bore, a nozzle tip'member located ins'aid bore engag ingsai'd annular shoulder, said tip member having a centrally located cylinder discharge aperture and having an innerfrusto-conical"surface, a curved flaring surface between said nozzle bore and said frusto-conical surface, said flaring surface forming the-outer annular wall of a Whirl chamber, a threaded-plug member threaded into said housing and having a. cylindrical bore, and having an annular frusto-conical end surface engaging said tip member and securing it against said annular shoulder, said nozzle tip member being formed with inwardly tapering grooves located at its frusto -conical'surface and tapering to zero depth at the edge of said whirl chamber, said grooves being symmetrically located and directed with respect to the whirl chamber to direct liquid from thegrooves peripherally of the whirl chamber in the same direction, an adjustable cylindrical member'located in the bore of said plug and movable axially therein to adjust the volume of discharge, said adjustable member having a frusto-conical end surface complementary to the adjacent frusto-conical surface on the nozzle tip member, the said plug and adjustable member effecting a liquid-tight seal against said nozzle tip member except at the tapering grooves when the adjustable member is at its minimum position, the retractionof said adjustable member increasing the ellectivedepth of the inner end portion of said grooves to increase the volume of discharge, to augment the diametrical size of the whirl chamber-and to permit the outer portions of the grooves to continue to direct liquid peripherallyof the augmented whirl chamber'to provide a continuous-spray of atomized liquid of the same characteristics, but in diiferent volumes, depending on-"the' position of said adjustable member, the said adjustable member being threaded into the bore in said plug member and having a rotatable shank extending from said housing and provided with an actuating member.

WILLIAM W. HALLINAN.

' REFERENCES CITED The following references are of record in the T file of this patent:

UNITED STATES PATENTS Number :Name Date 952,306 .Carnt Mar. 15, 1910 957,014 -Thornycroft May 3, 1910 1,051,908 Normand Feb. 4, 1913 1,098,160 'Mackie May 26, 1914 1,147,018 Hansen July 20, 1915 1,344,964 Russell June 29, 1920 1,667,943 Munz May 1, 1928 1,714,316 Oakley May 21, 1929 1,901,415 Schneider Mar. 14, 1933 1,972,537 Rufe Sept. 4, 1934 2,051,663 Werth Aug. 18, 1936 2,055,864 Harsch Sept. 29, 1936 2,069,150 Holder Jan. 26, 1937 2,086,074 Genovese July 6, 1937 FOREIGN PATENTS Number Country Date 118,856 Great Britain Sept. 12, 1918 298,252 Great Britain Oct. 8, 1928 288,727 ItaIy Sept. 19, 1931