US2612407A

US2612407A - Spray nozzle

Info

Publication number: US2612407A
Application number: US219549A
Authority: US
Inventors: John U Bete
Original assignee: Bete Fog Nozzle Inc
Current assignee: Bete Fog Nozzle Inc
Priority date: 1951-04-06
Filing date: 1951-04-06
Publication date: 1952-09-30
Anticipated expiration: 1969-09-30

Description

TOR. fizz:

flTTORNEY J. u. BETE SPRAY NOZZLE Filed April 6, 1951 Sept. 30, 1952 Patented Sept. 30, 1952 u we:

sfiRAYNiinii Jena =U. Bate, S'tbiiiliton, Mass assisiiaifco iace For News, 1116., Greenfield, corpora;

tion "of Massachusetts implication Kpiil itsi; semi its; titisib q '3 oiaiins.

This invention relates to spray type nozzles and is directedparticularly to "a spray nozzle for fire prevention and :fire extinguishing purposes of the type shown in niy patent No.;;2;518;11 6 entitled Spiral Film Spray Nozzle issued on Au- The object of this invention is to provide a spray type nozzle that has a solid cone shaped cAnotl-ierobject of the invention is to provide a spray nozzle that has a predete mined axial component combined with an effective spreading g nnother object of the inventionis to provide an elongated nozzle that has an even distribution of a hig-hrate ilow and is strong and rugged in construction.

Other and further objects of; the invention, particularly in the tapering oi thenozzle structure to a narrow tip at the end, will appear from the followingdescription taken in connection with the accompanying dr awing'sin which 2 is a ;long'itudi nal setional view oi the nozzletaken through the center ofthenozzle;

3 is a fragmentary view of the lower end ot the nozzle; w

41s an enlarged cross sectional view of the opt on portion of the ane; and M x Fig.; 5 a cross sectional view of the lower portiers of the var-16 H The nozzle shownin the drawings is of a generally tubular shape witha central passage I .f hrlpassing theliquid from the inlet orifice II to the helical slot I2 between; the convolutions of the helically formed vane I3 on th e lower part of tl-inozzle. A needle-shaped core I4 positioned inthelowen portionof the passage 19 within-- the vane I3 widening in the direction of flow of the liquid to progressively; reduce the cross sectional area of the passage I0 and force the liquid let to expand against the; inner cutting edge of the wine [3? The-vane l3 has an active surface I5 substantially lateral to the direction of now of the liquidand adjgcen'tthepass'age (0, The ac- .tivesurface l5 peels off the liquid and disperses it as a substantially uniform spray outside the nozzle-through the slot I2 between" the convolutions' of the vane. The van I3" is sha'ped on the general form of a helii: around thecylindr-i'cal exit pa'ss'age portion IQ of the'p'assag'e" H) with the convolutionsof the vane spa-@e'dfiom one another to form the helical 51st It communicatio with the exit assage ortion I8 through tl l helical opening [9' in'tl'ie' wall 20. The passage I0 may have a ventur'i' l-inarr'dwmg the direction of flow toincreasethe-velocity of flow oi the liquid in the exit passage portion I8 impinging on the inner edge of the active surface 15 of the vane I3. The wind'ffig" 6f vane l3 starts 811' a iibint above the nai rowed end of the Venturi I1 and ttfiifi'fifies btfi e lower end of th'fiizl. Th viiln l 3 an upper portion having a cross seetimer-shape as-indicated in Fig; 4 and a lower portion having-a cross sectionalshape typified in Fig: 5:

The upper portion-of the vane I3 comprises the convolution's fl 24; ,25 with the cross section of the convolution 24' shown in an enlarged viewdn Fig: 4'. Considering the cross sectional shape; the outer wall 28 is tapered narrowing the core end of the nozzle; The active surface I5 is substantial-ly lateral to the flow of the liquid and is at a small angle to a plane lateral to the axis of the nozzle The surface I5 forms a sharp-edge 30 with the wall 3[ of the passage I8. The outer portion 32 of the vane is stepped so that the surface 33 is recessed below the surface ;I5. An outer portion ofthe stream or jet of liquid flares and catches on the edge 3Dandsurface I5 an'dis directed outwardlythroughthe slot I2 as a sheet or mass ofwater that disintegrates into droplets liquid flow so that the spray has a; substantial axial component. The thin edge 40' between the surf-ace 1511 and thew'all 3| narrows down to a sharp edge on the latter part of the convolution 26 and the convolution 2'I bringing the upper portion of the surface I5a c los'e to ths surface 4| of the core I4. The under surface 42 is similar menses to the un etsurfac at gieyt that the adjaeefitths outer e ge 44 is flattened. Fig.3- are IiiiiQ-kSteFfrBfii the upset I 56?- the 16W g swath-e end or th the nozzle; Tus

notch 49. The core is securely held iii p the niit 52 tightened on the threads- 53' and seated asainst tlifl'at end; 54 of thehozzle'. s

The vnturr- |-1 extenas'ddwn toth iit passage sortie-11w and nierge'swithit t'o forth a c n'tinuous smootii sur'fadevane" I3 starts at the mwer portion or the ventur'i' with the e" 30a of theconvomudn zsmthesuiraee of th eritu'fi n S'Wthat-the' inner surface are or the contem- 30a and surface [5 peel off an outer portion of the moving liquid and direct it outwardly.

The core l4 extends into the passage up to with--' in the convolution 24 with the point 46 on a level with the upper portion of the edge 30b of the cona single vane winding helically around said annular jet. and having a, relatively. narrow helical slotofsmalle'r axial width'than gthej axial thickness of said vane and with an active surface of said vane inclined outwardly at an angleto said axis with its inner edge spaced progressively ,.;.nearer tothe surface of said tapering core, the angle of said active surface becoming greater at withe core end of the nozzle so that as the jet is volution 24. The portion of the surface 3| formy,

ing the passage I8 is substantially cylindrical and the cross sectional area of the passage [8 is 'reducedbythe widening conical-like surface 43 and the helical space between the surface 43 of the core and the helical surface 3| is reduced progressively.- The longitudinal space in the direction of axial flow is reduced longitudinally so that liquid entering'at the wide'en'd has an increased velocity or is maintained at-substantially the same velocity as on enteringthe passage 18.

The active surface is preferably 'helically formed progressivelyspread outwardly by said core a portion engages the active surface with the greater angle and is peeled off the jet and diverted with the surface substantially equal for each con- 1 reducing the thickness of the'walls of the nozzle and the obstruction of the outer supporting portion'32 to remove any interference of the support with thedispersion of the liquid." I

The liquid enters at the orifice ll under pressure from" a supply into the 'venturi IT. The

venturi I! reduces the cross sectional area of the flow increasing the velocity of-the "liquid while still within the tapering walls of the venturi and impinges on the edge 36a and surface l5 projecting into the liquid and forming a discontinuity in the wall of the assage: The edge a and surface l5 of the convolution 23 shave off a sheet of liquid and disperse it outwardly'around the 1 nozzle at an acute angle to a plane lateral to the axis of the nozzle inthe general shape of a come. The liquid moves on to withinjthe walls 3| of the convolution 24; The core it acts on the liquid forcing it' outwards against the edge 30 of the vane IS/maintaining the passage" l8 filled with liquid moving at a'high velocity. The edge 30 andsurface l5 of thesuccessive convolutions shave ofi a portion of thejliquid anddisperse it outwardly atan angle around 'the nozzle filling in the coneof spray. The shape of the vane l3 changes on convolutions 2 6. 21 and the surface 15a is at a greater angle and directs the, liquid in a moreaxial direction to fill in thecenter of the cone of spray and form solid mass of saturating spray. The sheets of liquid start to, break up afterleaving the surface-1.5and'eventually disintegrate into droplets forming a spray and an atmosphere diffusedwith liquid droplets.

, While a particular embodiment of the invention has been shown and described, it is understood that variouschanges and modifications can be made without departing from the invention.

. I claim:

1. ,A nozzle for producing a spray of desired characteristics directed outwardly around an axis comprising a generally tubular member having a passage to form a liquid jet around said axis, a core member coaxial with said tubular member and positioned centrally in said jet and tapered I to divert the jet fiow progressively outward in .annularformationaround said score member and outwardly by the active surface to form a full cone-shaped spray." i l '2. A nozzle fo'r'producing acone-shapedspray around an axis comprising; a generally tubular member having a central passageto con'finea liquid stream around said axis, a venturi at the inlet end of said passage, a helical vane formed around said stream overlapping with the venturi to taper the inner wall of said vane and-position the inner edge of said vane in said streani'of liquid to divert said liquid outside ofsaid nozzle, and a core member coaxial with said tubular member and positioned within said vane to narrow the cross sectional area of said passag'ebeyond said venturiand force the stream of liquid outwardly against said inner edgeof "said vane to further disperse said stream and form af'substantially full cone-shaped spray.

3. A-nozzle for producing a cone-shaped spray around the axis ofthe nozzle comprising a generally tubular member having an inner surface to form a passage to axially confine a solid stream of liquid, a'vane formed helicallya'roun'd said stream and having'a surfacei'nclined outwardly at an angle to'said axis,'said inner surface formed into a velocityincreasing venturiat the inlet end overlapping with the active surface "of'said vane to position said active surface in said stream from said wall to disperse a portion of the stream outwardly at an angle to said axis and around said nozzle, a tapered core coaxial with said tubular member and positioned within said vane beyond said overlapping portion of said venturi and said surface to force said stream against said active surface todisperse said liquid in a cone shape, and a secondactivesurface on the core end of said vane at a largeangle to a plane lateral to said axis to disperse said stream in a cone shape with a substantial axial componenfltofill said conesprayqfl; v I

4. Anozzle'as claimed inclaim 1 wherein the angle of said active surface changes abruptly and said active surface having the greater angle has a longer radial dimension than the active surface at the smaller'ang le 5. A nozzle'as claimed inclaim 1' wherein'said vane has an outer surface tap'ering inwardly'to widen the space between theconvo'lutions of the vane so the dispersed liquid can be directed with a larger axial component. j 6.;A no'zzle as claimed in claim l whereinthe outer surface of the helical'vane tapers continuously from a large diameter at its basetoa substantially smallerdiameter at its tip; v

' v JOHN U. BETE. REFERENCES CITED f "The following references are of record in'the file of this patent: i UNITED STATES PATENTSI 'I Number. 7

Name v -Date 1,549537; Y Hansen -Aug.:11,-:1925 2,518,116 7 Beta Aug. 8, 1950