US2273830A - Method of making nozzle sprayer plates - Google Patents

Description

Feb. 24, 1942. c, BR|ERLY AL 2,273,830

METHOD OF MAKING NOZZLE SPRAYER PLATES Filed Nov. 29, 1940 INVENTORS RALPH a; BR/ERLY BY assar H. WILEY A RNEY Patented Feb. 24, 1942 METHOD OF MAKING NOZZLE SPRAYER PLATES Ralph C. Brierly, Narberth,

' Darby, Pa.

and Elbert H. Wiley,

Application November 29, 1940, Serial N 0. 367,718

(Granted under the act of March 3, 1883. as amended April 30, 1928; 370 0. G. 757) 2 Claims.

This invention relates to a method of making a nozzle'sprayer plate, and has for an object to provide an improved nozzle sprayer plate especially intended for use in fuel oil burner nozzles or in atomizing other liquids or pulverized solids, and also to a method of manufacturing such sprayer plate which is much more rapid, eificient,

and less costly than the present known method of manufacturing the conventional sprayer plates.

The present manufacture of standard fuel oil sprayers plates requires sixteen separate operations for making the sprayer plate from one piece of metal rod. Such manufacture renders use of tough or highly resilient metals an arduous task, necessitating stocking of diverse sizes of milling cutters, and practically precludes any possibility of truly tangential entry of the sprayer plate slots into the whirling chamber. With this invention, instead of making the sprayer plate from a single piece of rod, it is made in two pieces, each individual piece being die stamped from a piece of metal ribbon stock and then the two individual pieces are spot welded to constitute a single piece, thus materially reducing the number of manufacturing operations essential in the production of a sprayer plate, simultaneously facilitating the use of abrasion resistant or non-free machining alloys, decreasing the number of tools necessary, and permitting truly tangential slot entry with consequent improvement in atomization performance. The slots of present single piece, solid metal sprayer plates are square in cross-section, out directly into the back of the plate, their combined cross-sectional area being a variable with the size and ratio of the sprayer plate. The slots of the two-piece,

die stamped, spot welded plate of this inventionlikewise possess combined cross-sectional areas which vary according to the size and ratio of the sprayer plate; few slot widths, however, are necessary in manufacture because the proper cross-sectional areas are obtained primarily through the use of various thicknesses of metal ribbon from which the rear portion of the plate is stamped. Use of a few standard thicknesses of metal ribbon stock for the rear portion of the plate, together with either constant or variable thicknesses of ribbon stock from which the front portion of the sprayer plate is stamped. permits a large number of sprayer plate ratios to be manufactured without changing the rear plate or front plate dies.

With the foregoing and other objects in view, the invention consists in the construction, comill bination and arrangement of parts hereinafter described and illustrated in the drawing, in which:

Fig. 1 is a perspective view of an alloy ribbon stock showing the rear portion of the sprayer plate which has just been .die stamped therefrom;

Fig. 2 is a similar view of another ribbon stock including the forward portion of the sprayer plate and the whirling chamber formed therein;

Fig. 3 is a perspective view of the assembled completed sprayer plate; and

Fig. 4 is a sectional view showing the sprayer plate mounted in operative position in a fuel oil burner nozzle.

There is shown at It) an atomizing nozzle in which the completed sprayer plate H has been assembled between the nozzle block l2 and the nut l3, the nozzle block l2 being threaded on a conduit H through which the fuel oil or other liquid being atomized is fed to the nozzle III. The sprayer plate II is provided with a whirling chamber I 5 terminating in an atomization orifice l6 and is also provided with slots I! truly tangential to and leading to the whirling chamber l5. This sprayer plate II is originally made in two separate individual portions, a front or whirling chamber portion l8 and a rear or slot portion 20, which two portions are integrally united into one piece by spot welds 2| equidistantly located between the slots I l to form a single sprayer plate II, as shown in Figs. 3 and 4. The rear or slot portion 20 is die stamped from a strip 22 of alloy ribbon stock which may be slightly greater in thickness 23 than the depth of the slots I! and of the rear opening 24 to the whirling chamber l5.

This ribbon 22 is passed between a suitable die stamp and anvil which stamps out the rear or slot portion 20 from the ribbon strip 22, simultaneously stamps through the slots l1 and the rear opening 24 to the whirling chamber, and at the same time compresses the portion 20 to the proper thickness. Another ribbon 25 of the same or other alloy is passed between a suitable die stamp and anvil which stamps out the front or whirling chamber portion l8, and at the same time draws out the whirling chamber dome 26 which. together with the whirling chamber opening 24 when assembled, forms the whirling chamber IS. The whirling chamber orifice l6 may then be drilled through, if it has not already been punched out simultaneously with the punching out of the whirling chamber portion l8. By selecting ribbons of suitable thickness,

slots ll of greater or lesser depth may be formed, and similarly the whirling chamber dome 26 maybe varied in size suitable to the particular adaptation for which it is intended.

Although the whirling chamber dome 26 has been shown as hemispherical, it is to be understood that this represents only a preferred shape and that the whirling chamber may be constructed through the use of a die which will produce conical or any other geometric form suitable for the purpose intended.

After the two portions l8 and 20 are thus formed, they are assembled into a unitary piece by the spot welds 2|. Thereafter a few additional machine operations may be necessary to smooth finish or complete the sprayer plate thus stamped and assembled. If the orifice l6 was not previously punched through, it may now be drilled through, and, if desired, as in producing rounded sprayer plates, the orifice edge may be rounded, reducing the thickness of the orifice wall to reduce the travel of the fuel oil or other liquid in that area. In addition, the rear surface of the plate may be lapped to make it truly flat after the spot weld so as to make it fit accurately within the nut I3 in the assembled nozzle Ill. Also, the slots may be honed to secure accuracy of dimensions as well as freedom from burrs.

Other modifications and changes in the numher and arrangement of the parts may be made by those skilled in the art without departing from the nature of the invention within the scope of what is hereinafter claimed.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

Having thus set forth and disclosed the nature of this invention, what is claimed is: 7

1. The method of making a sprayer plate for an atomizing nozzle, comprising die stamping a rear portion of the sprayer plate from ribbon stock of suitable thickness and material, simultaneously stamping an aperture centrally thereof, together with a plurality of slots leading to and terminating in said aperture at a tangent thereto, separately die stamping a whirling chamber dome front portion from ribbon stock of suitable thickness and material with the internal diameter of the whirling chamber dome substantially identical to the diameter of the central aperture of the rear portion, and spot welding said front and rear portions, with the aperture of the rear portion and the whirling chamber of the front portion in coincidence, into a unitary article. a

2. The method of making a sprayer plate for an-atomizing nozzle, comprising die stamping a rear portion of the sprayer plate from ribbon stock of suitable thickness and material, simultaneously stamping an aperture centrally thereof, together with a plurality of slots leading to and terminating in said aperture at a tangent thereto, separately die stamping a front portion from ribbon stock of suitable thickness and material and simultaneously drawing a whirling chamber dome therein with the internal diam-,

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