US2116863A - Spray and jet nozzle - Google Patents

Description

May 10, 1938. DlNLEY I 2,116,863

SPRAY AND JET NOZZLE Filed May 5, 1937 2 Sheets-Sheet 1 WITNESSES: INVENTOR:

2 BY Clarence Z'Dinley,

May 10, 1938. c; DINLEY 2,116,863

SPRAY AND JET NOZZLE Filed May 5, 1937 2 Sheets-Sheet 2 WITNESSE I INVENTOR- W Q Clarence iiflinlzy, fi 9 TTORNEYS.

Patented May 10, 1938 I 2,116,863

A UNITED STATES PATENT OFFICE 2,116,883 I SPRAY AND .m'r NOZZLE Clarence F. 'Dinley, Mich, .lssignor, by

mesne assignments, to Solvent Machine Com,- pany, trustee, Detroit, Mich, a corporation of Michigan Application tray 1m, No. 140,816

5 Claims. (Cl. sac-154) My invention relates to spray-jet nozzles and novel features of my nozzle that obviate clogging the like, and particularly to the'production of a can best be explained byreference to a specific flat spray or jet. An important object of the form of embodiment such as shown in the accominvention is to provide for spraying liquids conpanying drawings, in which:

-5 taining fine solid particles or dirt for long periods I Fig. I is av tilted or perspective view of one 5 without objectionable clogging of the spraying formof nozzle advantageously embodying my inopening by the solid matter. vention, showing the outlines of the flat spray of My new nozzle is especially adaptable and adliquid that it produces. vantageous for spraying (hot) liquid cleaning Fig. 11 is a side or edge view of the same nozzle.

agents, including grease solvents (e. g-., chlorinated Fig. III is a plan view of the same nozzle, with 10 solvents, such as trichlorethylene, for instance) one side partly cut and broken away; and for the purpose of cleaning metal parts of ad- .Fig. IV is a front end view. herent grease and solid particles of dirt, such as Fig. V is a side view of a cylindrical tubular abrasive, bufiing, and polishing agents. For this blank suitable for the manufacture of the nozzle 15 purpose, it is desirable to circulate and recircushown in Figs. I-IV; and 15 late the solvent continuously for considerable Fig. VI is an end view of this blank. lengths of time, during which the liquid solvent Figs. VII and VIII are similar views illustrating becomes charged with fine solid particles in susa stage in the manufacture of a nozzle from such pension. These particles tend to clog up the a blank.

spray devices or nozzles, compelling frequent As shown in Figs. I, II, III, and IV, the nozzle 0 costly shut-downs of the cleaning apparatus to has around body portion ill, with cylindrical bore, allow of cleaning the nozzles; or, to minimize the and is externally screw-threaded on its inlet end frequency of such shut-downs, it is necessary to Ii for convenience in attaching it to a liquid sup- 'replace or purify the solvent oftener than would ply connection, Fig. I. The body portion I 0 may be required to keep it in effective dirt-removing be of any length that is desirable in a particular 25 condition. This is expensive, and generally encase, but is here shown quite short. At its distails a shut-down of the apparatus. charge end or mouth i2, Fig. 11, the nozzle is There is no great difficulty in spraying mere flat (Figs. I and IV), and has an elongated outlet liquid, even when of rather thick consistency; and orifice or slot opening i3 of uniform width. The

many types of nozzles heretofore used answer that connecting portion between the and 3 purpose satisfactorily. But to spray in a flat the mouth edge 12a which defines the outlet orisheet a liquid containing solid particles is much fice ll forms an easy, smooth transition from the more diilicult, if clogging up and virtual stoppage round form to theflat. As shown in Figs. I and of the nozzle is to be avoided. One form of nozzle II, t s transitional Portion 1S fl tened more heretofore used for spraying liquids in a sheet and more on its top and bottom sides, from the 35 consists of a flattened head widely spread out, with bo y N t h mouth on a gradual, even tape a mouth slit from ear to ear of this head, so d 1S fl 'esp y w d 011i; e a to speak; but when the liquid contains solid pare horlzentally- In other Words, the internal ticles, they gradually deposit in the outer sides of Passage in e P01171011 is defined y a u c 40 the head, where the velocity of the fluid is rewhich changes and merges continuously and sub- 40 duced, and the deposits grow inward toward the fl l y uniformly from the ound inlet concenter. Another old form of nozzle consists of a figuration at l t0 the elon ated Outlet Orifice tube with its end closed off something like a derby and which ates at the fo ward mouth hat, with a diametrical slit across the end wall; d s "a. wh as h shown a p t y but in this device, the solid particles depositin strai ht. As r s wn. l t l n itudi al 45 the dead corners at either side of the slit, and elements of the internal surface -of the DOItiOII gradually build and come together. Yet another II are app y 0 Substantially Straight form of nozzle is like a tube with the and flate In the flattened melllih Portion the tened to a sort of slit, but nearly closed'in the d s f t nozzle a n t h d r sl tted back middle to spread the liquid out to each side: in at Ii, in relieving prolongation ension of 50 this nozzle, the solid particles deposit in the centhe Slot Opening 8 distance between one ter, where the velocity and flow are reduced. and tWO times the Width of the ts e e My new nozzle operates without objectionable shown, about one and one-half times the width. clogging many times as long as any nozzle here- In other words, the extremities of the elongated tofore available in the market. The distinctively outlet orifice II are prolonged and extended back 55 shown, the corners of the fiat mouth i2 are bevelled 011' at it, in the general direction of the nozzle length. As best shown in Figs. I and II,

the upper and lower corners of the slot opening l3 itself are also slightly relieved at H, in the way of bevelling or rounding.

From a consideration of Figs. I-IV in connection with the foregoing description, it will be seen that the interior of the nozzle presents no recesses or corners that may form dead places where the flow of the fluid is checked, or its velocity reduced. On the contrary, the fluid sweeps through in a steady flow, which increases in velocity with the progressive flattening out in cross-section and the corresponding gradual reduction in internal cross-sectional area. The fluid remains under pressure and its velocity builds up right to the very mouth opening, where the pressure is suddenly released.

In a nozzle through which the fluid sweeps freely at continually increasing velocity, as above described, the relief or cutting back at I5 in the edges of the mouth has a peculiar action, serving to augment the flow in the edges of the flat nozzle passage behind these notches, rather than to spread or fan out the flat liquid spray or jet beyond the nozzle opening l3. This compensates for the extra retarding friction of thefluid with the edges of the internal nozzle passage. The bulk of thefiuid sweeps through and out under the impetus of the velocity previously gained in the nozzle passage, with only a little more lateral spread than would be produced by the divergence of the nozzle edges as shown in Fig. 111 even in the absence of any notches l5. Thus the tendency toward deposition of solid particles at the corners or extremities of the orifice I3 is so materially reduced that my nozzle with the notches l5 will operate without clogging objectionably several times as long as if the corners of the mouth were not thus relieved. The relief of the edge corners at I! has a similarly helpful effect, though less marked.

'Flgs'V-VIII illustrate a preferred method of making a nozzle such as shown'in Figs. I-IV.

Starting with a suitable length of cylindrical metal tubing as a blank, as shown in Figs. V and VI, the first step is .to mash it down on a taper,

thus flattening the mouth end l2 and forminga s indicated in dot-and-dash lines in Figs. VII

and VIII, thereby forming the notches I! as shown in Figs. I-IV. This may conveniently be done by milling or grinding. The bevelling method of producing the notches l5 has the advantage of leaving these notches with edges of almost knife-edge sharpness at their bottoms, so that there is no drag on the escaping fluid at these points, to facilitate formation of deposits there, and no surface to receive such deposits. If found desirable, of course, the mouth slot l3 may be internally finished and the bottoms of the notches l5 squared by filing, or by an operation with a milling cutter, or by grinding.

The incidental operations of threading the blank or nozzle as at H in Figs. II and III and bevelling or rounding off the corners of the slot opening l3 at I! may be done in any preferred sequential relation to the other operations, by methods well known in metal working.

Having thus described my invention, I claim:

1. A flat-spray nozzle having an inlet round in cross-section and a narrowed outlet or mouth with an outlet orifice of elongated shape and uniform width, and having a passage connecting said inlet to said outlet orifice and defined by a surface which changes and merges continuously and uniformly from the round configuration of the inlet to the elongated outlet orifice, and terminates at the forward mouth edge which defines said outlet orifice, the extremities of the elongated outlet oriflce being prolonged and extending back from its said edge into the narrow sides of the mouth; all so that the fluid sweeps right through the nozzle and its mouth under pressure, while internal corners and relatively dead places within the nozzle are avoided, as well as frictional drag at the edges of the flat fluid stream.

2. A flat-spray nozzle asset forth in claim 1 having the forward mouth edge which defines the elongated outlet orifice slightly relieved.

3. A fiat-spray nozzle as set forth in claim 1 wherein the mouth edges which define the outlet orifice are straight.

4. A flat-spray nozzle as set forth in claim 1 having the corners of its narrowed mouth excised in the general direction of the nozzle length, so that the prolongations of the outlet orifice back into the narrow sides of the mouth terminate in knife edges at their bottoms.

5. A flat-spray nozzle as set forth in claim 1 consisting of a length of originally round tubing having its end portion flattened on a substantially even taper and the corners of its narrowed mouth excised in the general direction of the nozzle length, so as to prolong the outlet orifice back into the narrow sides of the mouth.

CLARENCE F. DINLEY.

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