Spiral film spray nozzle
US RE23413 E
Description (OCR text may contain errors)
Oct. 2, 1951 J. u. BETE SPIRAL FILM SPRAY NOZZLE Original Filed Feb. 26, 1946 Reissued Oct. 2, 195 1 SPIRAL FILM SPRAY NOZZLE John U. Bete, Greenfield, Mass., assignor, by mcsne assignments, to Bete Fog Nozzle, Inc., Greenfield, Mass., a corporation of Massachusetts Original No. 2,518,116, dated August 8, 1950, Se
rial No. 650,341, February 26, 1946. Application for reissue May 25, 1951, Serial No. 228,332
Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue specification; matter printed in italics indicates the additions made by reissue.
This invention relates to a spray nozzle and its principal object is to provide a nozzle which is of simple but durable construction, efiicient and reliable in operation and embodying a design which may readily be varied so as to obtain the desired spray characteristics.
Further objects relate to various features of construction and will be apparent from the consideration of the following description and the accompanying drawings, wherein:
Fig. 1 is an elevation of a spray nozzle constructed in accordance with the present invention;
Fig. 2 is a vertical section through the nozzle shown in Fig. 1;
Fig.3 is an elevation of the insert; and
Fig. 4 is a cross section through a thread or vane of modified form.
In accordance with the present invention my spray nozzle comprises a generally tubular member having a body portion defined by one or more helical threads or vanes, one end of the tubular member defining an inlet and preferably being formed so as to provide a connection with a pipe line or the like. The opposite end of the tubular member is provided with a generally conical insert having its tapered portion extending inwardly in coaxial relation and preferably coextensive with the helical vane or vanes. With this construction and arrangement, variations in the type and character of the spray may be had by varying (a) the lead or pitch of the helical vane or vanes; (b) the number of vanes, i. e., single, double, etc.; (0) the length and shape of the insert; (d) the angle and shape of the active surface of the helical vane or vanes; and (e) the diameter of the helix defined by the vanes.
With a given tubular member having uniform helical vanes, the spray characteristics may be modified by varying the shape of the taper-ed insert, an insert having a, surface contour presenting a generally parabolic shape producing the maximum degree of fineness of spray, although a straight taper, i. e., ageometric cone, produces satisfactory results and has the further advantage of being more economical to manufacture. Special spray patterns, e. g., coarse outside cone and fine inside cone, may be obtained by using inserts having different shaped surface contours. The size and shape of the entrance inlet or throat may also be varied to obtain different effects, but for general use, a high velocity jet is usually desired, and to this end a Venturi throat is recommended.
A full cone spray may be obtained by varying followed with a 90 cut over a portion of its length, or a combination of two or all of these modifications. Thus, an unlimited number of spray patterns and characteristics may be obtained from the same basic arrangement of parts.
Referring to Figs. 1 to 3, which illustrates what is now considered a preferred embodiment particularly suitable for use as a sprinkler in a fire protection system, a length of metal rod of hexagonal cross section, turned down to form a cylindrical body portion I and a hexagonal coupling head 2 is bored or drilled axially to provide a central channel 4 communicating with a Venturi throat or inlet 5 formed in the head 2. The outer end of the head 2 is turned down and threaded, as shown at 6, to provide a coupling element for attachment to a pipe or other conduit, and the body portion is milled or cut away to form a pair of helical threads or vanes 8 and 9 of generally trapezoidal cross section.
A generally conical insert N) (Fig. 3) having a surface contour of approximately parabolic curvature, is disposed within the channel 4 with its enlarged end sealing the outer end of the channel, and its tapered body portion extending coaxially into the channel with its inner end terminating at or adjacent to the inner end of the throat 5, as shown in Fig. 2. A set screw 12, carried by the lower end of the tubular body I, holds the insert l0 securely in place.
The sprinkler head herein shown may be screwed into a socket equipped with a fusible plug or the like, and when put in use, the high velocity jet issuing from the throat 5 is progressively diverted outwardly by the insert H) as it travels the length of the vanes 8 and 9, so that it impinges upon the inner edges of the upper faces 14 and I5 of the vanes and is directed outward along said faces and is thus transformed into a relatively fine conical shaped spray.
If it be desired to increase the fineness of the spray, the upper or active surface of each vane I!" may be stepped, as shown in Fig. 4, to provide a relatively narrow inner surface l6 spaced above the outer surface ll. This particular design appreciably reduces the frictional resistance of the fluid passing over the active surface of the vanes without materially reducing the mechanical strength of the spray nozzle.
While I have shown and described one desirable embodiment of the invention, it is to be undertrally in said jet and having a surface of revolu stood thaitthis enclosure is to! theipurpOSeibflilitioni enlarging in the dineetion of Eflow or the jet lustration and" that various changes andmodifialong"smoothlycontinuous-lines=curving from a Cations y be made Without departing from the :sdirection partly radial at the apex toward a more spirit and scope of the invention as set forth in nearly axial direction to divert the jet flow prothe appended claims. gr'essively- -ontward in annular formation around I claim: ssesaidicoreimem-ber and a vane winding helically l. A nozzle f p inea continuouspir atoundesaid core-member and said annular jet Comprising a generallyifiyiindliba'l membersandihdvingiansactive surface inclined upward at the inte d ate portion Which is Cut y an angle to said'aaz-is and also winding around said form a Co t uo s helical threadlhaving r a i-core,memberwin.helical formation and ,having a t y parallel inner and 6111513135Wainsfiwithiidd- ,ffre'e inn'er'jedge atysubstantially constant distance joining faces that are a y e i he -,fromft he,sa1bl amis so as to be spaced progressively inner l Of Said thread being of greater Width nearer tot/1e surface of said core member, the y'et than the outer Wall and defining a M -IS issuing" from said throat being progressively of substantially uniform. diameter, one end oftsaid e aio iward.insaidannu ar, f rmat n Said cylindrical'member providing a fll lidlinlt fiilda m along thetzen g th o a -w generally coniealinsert in the 'otheibndwf 'pingg on" the said inner "edge" of the active guyy dri l me wi h i tapered d portion face thereof to be transformed into a relatively extending towardsaidinlet and coaxially within fine smwg Said'helical threadv Anoezlefor producing a spray directed out- 2. A nozzle forpro'd'ueing' a continuous-spiral gwa d r nd an axis comprisinga generally m. filmQcomDriSing a genifiillycylind'lica1 member, bularmember having a throat portion receiving "theintermediate'portionoffwl ich is'cut awa'yto I 'i m supplyv and farming it into a jet amdnd i vfofm continuous helical thread f approximate '25 saidaxis, a core member coaxial'with saidtubu- T. trapezoidal-Shaped'" =ioss:seciion, inner lar member and, positioned centrally in s aid ret "Wall O saido'thread'being o r e Width than and enlarginginthe direction of flow of the jet ithe'outerw'alland'defininganaxial bOreofsub- 15 ve t th jet";flow'.p7f0gr888i2)l3j outward in s'tantia11y"'uniform diameter; oneend of said cyannular formation around said core member, and
fir r g 'fl inlet'havingw amvaneflwinding. helically, around said coreflmern- I a n i 'Wa11' frme with venturifthmat' benand, said annularjet andhaving a telfltizzely a a q n j is i i the" other. narrow active surface less than the maximum T9 i cylindrical r ih a a. axial thickness of; thevane andinclinedoutward portion extendingi'towardsaid inlet and coaxially at an angle to said axis and dlsowmdmg around Wtthm k e r V a said corememben. in helicalformationandhavfor P fqmt i m ingan innerv-edge spacediprogressively nearer to y n t 53 F3 i member "the surface of said core member s othat as. thejet 1t i te port on of w ic a to issuing from saidthroatisvrogressi-velgdinected .h' F m "having s Ontwatd inannular formation byvsaid. core memfstannavloly parallel mnerand'outer Wang wlth'ad' her it. travels the lengthof said vane and impinges 'fijoining faces that are outwardly convergent the .lonlthe inneredge of..the active face thereof to be "innerwall of saidthrea'd being" of g'reaterwidth etrransfm'gmedlmto relatively fine spray "than the'outenwalkand defining an axial bore of "substantially"uniforin diameter,'t.one"endoi ."JOHN' U- B T said cylindrical member'providi'ng afluidinlet, 1r,
the adjoining "face of said'thread opposing the E CITED fiilid fl j g' S DD p "Theifollowing' ereferen'ces 'are of record in the vide-a relatively-narrow Surface spaced inwardly filebfthis-patent or 'the original patent:
of'and axially offset from the-outer surfacepor- I non thereof; a'nda generally'conical insertin the UNITED STATES; PATENTS other end' ofsaid cylindrical rnember withits Nii'm-ber 'Name Date tape'red-end-portion' eXtending-towardsaid inlet I -'-'Hansen Aug. 11; 1925 "and coaxially within said-helicarthread. 2 'scofield *Dec.- 10,;- 1940 4; A nozzle f r producing a spray directed up- 2,'359,171 'Tarbox Sep-t.'26;.'1944 ward around an amis-comprising 'a generallntu-a bular member having a throat-=portion receiving "FOREIGN'PATENTS 'a-liquid su pl and forming it into-a jetaroand Number 1 il'icountry -D said axis, a generally conicdl core 'm-mber cbam- 501L109 Jan-1 ial with said tubular'rnemberand positioned-cen-