CA1117167A - Liquid particle deflector structure for discharge nozzles - Google Patents
Liquid particle deflector structure for discharge nozzlesInfo
- Publication number
- CA1117167A CA1117167A CA000330410A CA330410A CA1117167A CA 1117167 A CA1117167 A CA 1117167A CA 000330410 A CA000330410 A CA 000330410A CA 330410 A CA330410 A CA 330410A CA 1117167 A CA1117167 A CA 1117167A
- Authority
- CA
- Canada
- Prior art keywords
- stream
- teeth
- row
- discharge
- pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
A plurality of circumferentially spaced teeth are posi-tioned in a predetermined manner on the end of a pattern-forming sleeve for a liquid discharge nozzle. Each of the teeth is provided with a stream-deflecting surface which is disposed to deflect portions of the discharge stream angular-ly into the intercepting relationship with each other to in-crease the liquid particle break-up in the stream and improve the uniformity and homogeneity of the stream pattern.
A plurality of circumferentially spaced teeth are posi-tioned in a predetermined manner on the end of a pattern-forming sleeve for a liquid discharge nozzle. Each of the teeth is provided with a stream-deflecting surface which is disposed to deflect portions of the discharge stream angular-ly into the intercepting relationship with each other to in-crease the liquid particle break-up in the stream and improve the uniformity and homogeneity of the stream pattern.
Description
~ ~'7~ 7 l~lis applic~tion relates to licluid flow di~charge nozzles, particularly o:f the type used in fire fighting. It is common-place for such fire figh-ting nozzles to have æome form o~
discharge s-tream pattern adjustment which will permit -the dis-charge to be varied from a straight stream -to a mist or wide fog pattern by means of a longi-tudinally adjustable pattern sleeve which projects beyond the discharge orifice of the nozzle into the path of the ~tream. The patter~ forming sleeve is usually metal and has molded thereto a rubber bumper which serves both to protect the discharge end of the noz~le against damage or injury, as well as to prov~de a grooved or toothed surface for reflecting a portion of the discharge stream inwardly toward the center of the stream. Examples o~
this general type of stream forming pattern sleeve structure are disclosed in U.S. Patent Nos. ~,387,791; 3,540,657 and ~,784,113.
As the pa-ttern sleeve on the nozzle i5 adjusted from the straight stream position to the wider fog pattern, a progres~
sively increasing portion of the discharge stream is directed toward the teeth on the bumper. The forward or inwardly directed surfaces of these teeth are flat and are deliberate-ly designed to reflect those portions o~ the stream which impinge upon it directly back into the central portion of the discharge stream.
The teeth are circumferentially spaced from each other and the non-reflected portion of the stream passes divergent-ly upwardly of -the nozzle through the passageways or spaces between the teeth.
By reason of the customary structure of fire-fighting nozzles, which include a central baffle head arrangement, the center portion of the discharge stream contains far fewer water particles than the other portions of` the discharge stream. This cen-ter por-tion de~ines a low pressure area resulting from the jet s-tream or aspirator effect of -the high velocity flow o~ lL~uid surrounding it. ~liS central hollow core of the discharge stream is undesirable both from the standpoint of the safe-ty of the hose handler as well as from the standpoint of effectively and efficiently extinguish~
ing a fire.
The purpose of providing the reflecting surfac~s on the bumper teeth is to attempt to get some of the water to bounce back into the cen-tral void in the discharge stream and there-by increase the water conten-t in this hollow core of the stream. However, the major portion of the discharge stream passes between the spaced tee-th and forms the "fingers" of a typical cone pattern. Only a minor proportion of the stream actually is reflected back by the fingers into the hollow central core.
It has been observed that the low pressure area in the center of the discharge stream causes a rush of air at the higher atmospheric pressure to pass into and through the dis-charge stream toward the central portion of the stream in order to achieve atmospheric pressure equilibrium~ This air M ow can be utilized to direct a significantly increased pro~
portion of the stream back toward its hollow center~ than is possible by simple utilization of a flat reflecting surface on the teeth of the pattern sleeve.
It is a primary object of the in~ention to provide an improved form of stream deflecting teeth on the discharge end of a stream forming pattern sleeve for a nozzle.
A further obJect of the invention is to provide a tooth
discharge s-tream pattern adjustment which will permit -the dis-charge to be varied from a straight stream -to a mist or wide fog pattern by means of a longi-tudinally adjustable pattern sleeve which projects beyond the discharge orifice of the nozzle into the path of the ~tream. The patter~ forming sleeve is usually metal and has molded thereto a rubber bumper which serves both to protect the discharge end of the noz~le against damage or injury, as well as to prov~de a grooved or toothed surface for reflecting a portion of the discharge stream inwardly toward the center of the stream. Examples o~
this general type of stream forming pattern sleeve structure are disclosed in U.S. Patent Nos. ~,387,791; 3,540,657 and ~,784,113.
As the pa-ttern sleeve on the nozzle i5 adjusted from the straight stream position to the wider fog pattern, a progres~
sively increasing portion of the discharge stream is directed toward the teeth on the bumper. The forward or inwardly directed surfaces of these teeth are flat and are deliberate-ly designed to reflect those portions o~ the stream which impinge upon it directly back into the central portion of the discharge stream.
The teeth are circumferentially spaced from each other and the non-reflected portion of the stream passes divergent-ly upwardly of -the nozzle through the passageways or spaces between the teeth.
By reason of the customary structure of fire-fighting nozzles, which include a central baffle head arrangement, the center portion of the discharge stream contains far fewer water particles than the other portions of` the discharge stream. This cen-ter por-tion de~ines a low pressure area resulting from the jet s-tream or aspirator effect of -the high velocity flow o~ lL~uid surrounding it. ~liS central hollow core of the discharge stream is undesirable both from the standpoint of the safe-ty of the hose handler as well as from the standpoint of effectively and efficiently extinguish~
ing a fire.
The purpose of providing the reflecting surfac~s on the bumper teeth is to attempt to get some of the water to bounce back into the cen-tral void in the discharge stream and there-by increase the water conten-t in this hollow core of the stream. However, the major portion of the discharge stream passes between the spaced tee-th and forms the "fingers" of a typical cone pattern. Only a minor proportion of the stream actually is reflected back by the fingers into the hollow central core.
It has been observed that the low pressure area in the center of the discharge stream causes a rush of air at the higher atmospheric pressure to pass into and through the dis-charge stream toward the central portion of the stream in order to achieve atmospheric pressure equilibrium~ This air M ow can be utilized to direct a significantly increased pro~
portion of the stream back toward its hollow center~ than is possible by simple utilization of a flat reflecting surface on the teeth of the pattern sleeve.
It is a primary object of the in~ention to provide an improved form of stream deflecting teeth on the discharge end of a stream forming pattern sleeve for a nozzle.
A further obJect of the invention is to provide a tooth
- 2 -1~7~L~7 arrang~ment of -the character de3cribed which will result in er~anced a~omization or break-up of the liquid particles o~
the stream which impinge upon the teeth.
Another object of the invention is to improve the uni-formity and homogeneity of the discharge s-tream cross section.
According to a broad aspect of the invention, there is provided in a stream-forming pattern sleeve for a cylindrical discharge no~zle, the combination of an angularly extending tooth-supporting surface provided on the end of said sleeve, a first row of upright circum~erentially-spaced teeth pro-jecting from said surface lnto the path of the discharge stream, a second row o~ upright circumferentially-spaced teeth projecting ~rom said surface into the path of the dis-~charge stream and radially outwardly of said ~irst row, the teeth of said second row being of lesser width than the teeth of said first row, a stream-deflecting surface presen-ted by each tooth, said stream-deflecting surface having forward portions thereof disposed to de M ect said stream angularly toward adjacent teeth, whereby portions of said discharge stream are directed into intercepting rela-tionship with each other to enhance liquid particle break-up of said stream.
Other objects and advantages of the invention will appear during the course of the following description and with refer-ence to the annexed drawings in which like parts are designated by like numerals throughout the same.
Fig~ 1 is a plan view of the end of a pattern sleeve on a liquid discharge nozzle, showing the tooth structure of the invention.
Fig 2 is an enlarged fragmentary cross-sectional view9 t~en as indicated on line 2-2 of Fig. 1.
the stream which impinge upon the teeth.
Another object of the invention is to improve the uni-formity and homogeneity of the discharge s-tream cross section.
According to a broad aspect of the invention, there is provided in a stream-forming pattern sleeve for a cylindrical discharge no~zle, the combination of an angularly extending tooth-supporting surface provided on the end of said sleeve, a first row of upright circum~erentially-spaced teeth pro-jecting from said surface lnto the path of the discharge stream, a second row o~ upright circumferentially-spaced teeth projecting ~rom said surface into the path of the dis-~charge stream and radially outwardly of said ~irst row, the teeth of said second row being of lesser width than the teeth of said first row, a stream-deflecting surface presen-ted by each tooth, said stream-deflecting surface having forward portions thereof disposed to de M ect said stream angularly toward adjacent teeth, whereby portions of said discharge stream are directed into intercepting rela-tionship with each other to enhance liquid particle break-up of said stream.
Other objects and advantages of the invention will appear during the course of the following description and with refer-ence to the annexed drawings in which like parts are designated by like numerals throughout the same.
Fig~ 1 is a plan view of the end of a pattern sleeve on a liquid discharge nozzle, showing the tooth structure of the invention.
Fig 2 is an enlarged fragmentary cross-sectional view9 t~en as indicated on line 2-2 of Fig. 1.
- 3 -1~7~L6~7 Fig 3 is a view similar to Fig. 1, but showin~ another form of the invention.
Fig. 4 ~s an enlarged fragmentar~ cross~sectional view, taken as indicated on line 4-4 on Fig. ~.
Figs. 5, 6 and 7 are fragmentary schematic plan views illustrating comparative water stream formations for various tooth arrangements.
Fig~ 8 is a fragmentary plan view, similar to Fig. 3, but showing a modified form of tooth.
Referring to Figs. l and 2 of the drawings, ~he parts of a liquid discharge nozzle pertinent to an understanding of the invention are shown. A nozzle body lO has a throat portion ll defining a liquid discharge opening 12. Overlying the discharge opening and throat is a baf~le 13 which custom-arily is movably mounted to adjustably define a discharge orifice 14.
Movably mounted on the nozzle body lO is a stream-form-ing pattern sleeve 15 whose position can be longitudinally adjusted from ~he phantom line position shown in Fig. 2, for a straight stream pattern, to the solid line position shown in Fig. l, for a wide fog or spray pattern. me pattern sleeve is usually metal and has customarily molded thereon a protective rubber bumper portion 16. Although the stream-deflecting tooth arrangement hereinafter described is indi~
cated as being provided on the bumper 16, it will be under-:
stood that it can be provided on the pattern sleeve regard-less of whether the pattern sleeve is a composite of metal and rubber or not.
The terminal portion of the pattern sleeve 15 is pro-vided with an angularly extending tooth-supporting surface 17, ~ - 4 _ ~ 6 7 which forms par-t of the bumper 16. A plurality of up~ight circumferentially-spaced teeth lB project from the surface 17, adjacent the inner edge 19 thereof, and extend radially out-wardly toward the periphery or rim 20 of the surface 17.
The nose or forward portion 21 of each of the teeth 18 has a rounded or arcuate configura-tion which provides a stream-deflecting surface 22. me sides 23 of each tooth 18 are flat or planar and are substantially parallel with each other. The sides 23 of adjacent teeth 18 define a flow channel for the stream o~ liquidO me flat sides 23 also serve as impingement surfaces for liquid particle break-up in the manner hereina~ter described.
As the pattern sleeve is adjustably moved from the phantom line straight stream position toward the wide fog solid line position, progressively greater portions of the discharge stream are directed from the discharge orifice 14 toward the terminal end of the pattern sleeve and the teeth 18 to form a cone spray pattern. The baffle 13 obstructs the center of the discharge opening and tends to create a liquid void in the center of the stream. This void is undesirable from the standpoint of operator safety as well as from -the standpoint of fire fighting efficiency. It has heretofore been accepted that the function of the teeth on the end of the pattern sleeve 15 is to mechanically obstruct the diver-gence of a portion of the li~uid stream when the position of the pattern sleeve is such as to cause the stream to be directed in a cone shaped pattern. As lndicated in Flg. 5 of the drawing? the prior art teeth are provided with a nose or forward portion which is flat and substantially parallel to the longitudinal axis of the nozzle. Those portions o~
i7 the stream whose flow is obstructed by -the -teeth, are re~lect-ed or bounced back into a straight stream tra~ectory, and the remainder of the stream discharges through the channels form-ed between adjacent teeth and creates -the characteristic "finger" effect in the conical stream pat-tern. For any given particle of the liquid, there is only a single instance of impingement on the flat nose surface of the too-th.
In contras-t to the accepted prlor art approach described above, the present invention is based upon utilizing a tooth structure which will not completely obstruct and reflect a portion of -the liquid stream, but which will create smaller liquid particles through deflection and multiple impingement of portions of the liquid stream with each other and with the surfaces of the teeth 18. Instead of mechanically de-~lecting these portions of the liquid stream into a given straight stream pattern, the liquid particles are broken up into sufficiently small particle sizes so that they can be carried by air flow bac~ toward the center of the stream in a dispersed fashion which provides greater uniformity and homogeneity for -the stream pattern.
me high pressure and high velocity discharge of water from a fire nozzle creates a low pressure area in the central portion of the discharged s*ream which generates a substantial air flow toward the center of the stream to achieve atmos-pheric pressure equilibrium. mis atmospheric air flow is of sufficient in-tensity and velocity to carry wi-th it sub-stantial quantit:ies of fine water particles and direct them toward the center of the discharge stream. The functîon of the teeth 18 is to break up the li~uid particles into a ~0 sufficiently fine size so that a substantial portion of the .
~171~7 deflected stream will be carried back by the air flow into the desired central area of the cone pattern.
Wh~reas the fla-t reflecting forward por-tion of -the prior art form of too~h acts ~ssentially as an ex-tension of the straight stream forming surface 24 of the pattern sleeve 15 the nose portion 21 of the tooth l8 is disposed to deflect the liquid stream angularly in the direction of the adJacent teeth 18 so that these deflected portions o~ the stream inter-cept each other to cause further break-up of the liquid particles. The intercepting portions of the deflected stream divert each other into impingement on ~he sides 23 of the teeth 18 for further particle break-up of the liquid by said impingement, as well as by the interaction of these deflected portions of the stream with the portions of the stream which pass directly into the previously described channels 25 form-ed between adjacent teeth. mus the deflected stream is exposed to a multiple sequence of liquid particle atomization which reduces particle size sufficiently so that the inrush-ing atmospheric air flow can carry the particles toward the center of the discharge stream and restore greater liquid con-tent in ~liS area of the stream pattern. As schematically illustrated in Fig. 6, the resulting conical stream pattern shows a substantial min1mization of the undesirable and characteristic "fingers" created by deliberate obstruction of fluid flow by the prior art form of teeth shown in Fig~ 5.
In Figs. 3 and 4 of the drawing, there is sho~n a modi-fied form of tooth arrangement on the tooth support surface 17 of the pattern sleeve 15. An inner or first row of cir-cumferentially-spaced teeth 26 and a second outer row of cir~
cumferentially spaced teeth 27, in staggered relationship to the teeth 26, is utilized.
Both the tee-th 26 and the teeth 27 have the rounded stream-deflecting surface 22 on the forward portion 21 there~
of Both the teeth 26 ~nd 27 have the flat side portions 23 as in th~ previousl~ described -too1;h l8.
The -teeth 27 o~ the outer row are s-taggered in relation ship to the teeth 26 of the inner row ~nd are preferably dis-posed midway in the channel 25 formed ~y the ad~acent teeth of the inner row. The teeth 27 are elevated abo~e the teeth 26 so as to project outwardly from the surface 17 to a greater extent than the teeth 26. It has been found desirable, though not mandatory, that the teeth 27 be of somewhat small-er dimension thc~n the teeth 26, particularly in width. The teeth are disposed coaxially relatively to the longitudin~1 axis of the pattern sleeve 15 and the discharge stream.
m e utilization of the staggered outer row of teeth 27 provides an additional deflecting and impingement surface for the discharge stream and provides a discharge channel 28 between adjacent teeth 27 in the outer row~ In the larger sizes of fire-fighting nozæles, where the discharge gallonage is of substantial magnitude, the outer row of teeth provides further atomiza-tion and particle break-up of the discharge stream to create the necessary fine particle size which will lend itself to being carried back toward the center of the stream by the jet stream or suction effect previously de scribed~
As illustrated in Fig~ 7 of the drawing, the dispos-tion of the deflecting teeth in staggered coaxial rows results in substantial elimination of the non-homogeneous pattern of characteristic ~Ifingers~ in the wide fog stream and pro-vldes a uni~ormity of stream pa-ttern and liquid content.
In Fi~. 8, there is shown a modified form of tooth 29 having a trian~ular nose por-tion 30 which presents divergen-t flat deflecting surfaces 31 to the liquid s-tream. ~5 in -the case of the rounded stream deflect;ing surfaces 22 o~ the teeth 18, 26 and 27, the angularly directed deflecting sur-faces 31 cause portions of the discharge stre~n to be direct-ed into intercepting relationship with each other and to be diverted into impingement with the fla-t sides 23 of -the teeth.
As in -the case of the previously described rounded stream-deflecting surfaGe 22, the function of the deflecting surfaces 31 is to direct portions of the discharge stream into paths which will cause sufficient atomization of the liquid particles to permit the atmospheric air flow to carry them back toward the center of the discharge stream.
It is to be understood that the forms of my invention, herewith shown and described, are to be taken as preferred examples o~ the same, ~nd that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoined claims.
Fig. 4 ~s an enlarged fragmentar~ cross~sectional view, taken as indicated on line 4-4 on Fig. ~.
Figs. 5, 6 and 7 are fragmentary schematic plan views illustrating comparative water stream formations for various tooth arrangements.
Fig~ 8 is a fragmentary plan view, similar to Fig. 3, but showing a modified form of tooth.
Referring to Figs. l and 2 of the drawings, ~he parts of a liquid discharge nozzle pertinent to an understanding of the invention are shown. A nozzle body lO has a throat portion ll defining a liquid discharge opening 12. Overlying the discharge opening and throat is a baf~le 13 which custom-arily is movably mounted to adjustably define a discharge orifice 14.
Movably mounted on the nozzle body lO is a stream-form-ing pattern sleeve 15 whose position can be longitudinally adjusted from ~he phantom line position shown in Fig. 2, for a straight stream pattern, to the solid line position shown in Fig. l, for a wide fog or spray pattern. me pattern sleeve is usually metal and has customarily molded thereon a protective rubber bumper portion 16. Although the stream-deflecting tooth arrangement hereinafter described is indi~
cated as being provided on the bumper 16, it will be under-:
stood that it can be provided on the pattern sleeve regard-less of whether the pattern sleeve is a composite of metal and rubber or not.
The terminal portion of the pattern sleeve 15 is pro-vided with an angularly extending tooth-supporting surface 17, ~ - 4 _ ~ 6 7 which forms par-t of the bumper 16. A plurality of up~ight circumferentially-spaced teeth lB project from the surface 17, adjacent the inner edge 19 thereof, and extend radially out-wardly toward the periphery or rim 20 of the surface 17.
The nose or forward portion 21 of each of the teeth 18 has a rounded or arcuate configura-tion which provides a stream-deflecting surface 22. me sides 23 of each tooth 18 are flat or planar and are substantially parallel with each other. The sides 23 of adjacent teeth 18 define a flow channel for the stream o~ liquidO me flat sides 23 also serve as impingement surfaces for liquid particle break-up in the manner hereina~ter described.
As the pattern sleeve is adjustably moved from the phantom line straight stream position toward the wide fog solid line position, progressively greater portions of the discharge stream are directed from the discharge orifice 14 toward the terminal end of the pattern sleeve and the teeth 18 to form a cone spray pattern. The baffle 13 obstructs the center of the discharge opening and tends to create a liquid void in the center of the stream. This void is undesirable from the standpoint of operator safety as well as from -the standpoint of fire fighting efficiency. It has heretofore been accepted that the function of the teeth on the end of the pattern sleeve 15 is to mechanically obstruct the diver-gence of a portion of the li~uid stream when the position of the pattern sleeve is such as to cause the stream to be directed in a cone shaped pattern. As lndicated in Flg. 5 of the drawing? the prior art teeth are provided with a nose or forward portion which is flat and substantially parallel to the longitudinal axis of the nozzle. Those portions o~
i7 the stream whose flow is obstructed by -the -teeth, are re~lect-ed or bounced back into a straight stream tra~ectory, and the remainder of the stream discharges through the channels form-ed between adjacent teeth and creates -the characteristic "finger" effect in the conical stream pat-tern. For any given particle of the liquid, there is only a single instance of impingement on the flat nose surface of the too-th.
In contras-t to the accepted prlor art approach described above, the present invention is based upon utilizing a tooth structure which will not completely obstruct and reflect a portion of -the liquid stream, but which will create smaller liquid particles through deflection and multiple impingement of portions of the liquid stream with each other and with the surfaces of the teeth 18. Instead of mechanically de-~lecting these portions of the liquid stream into a given straight stream pattern, the liquid particles are broken up into sufficiently small particle sizes so that they can be carried by air flow bac~ toward the center of the stream in a dispersed fashion which provides greater uniformity and homogeneity for -the stream pattern.
me high pressure and high velocity discharge of water from a fire nozzle creates a low pressure area in the central portion of the discharged s*ream which generates a substantial air flow toward the center of the stream to achieve atmos-pheric pressure equilibrium. mis atmospheric air flow is of sufficient in-tensity and velocity to carry wi-th it sub-stantial quantit:ies of fine water particles and direct them toward the center of the discharge stream. The functîon of the teeth 18 is to break up the li~uid particles into a ~0 sufficiently fine size so that a substantial portion of the .
~171~7 deflected stream will be carried back by the air flow into the desired central area of the cone pattern.
Wh~reas the fla-t reflecting forward por-tion of -the prior art form of too~h acts ~ssentially as an ex-tension of the straight stream forming surface 24 of the pattern sleeve 15 the nose portion 21 of the tooth l8 is disposed to deflect the liquid stream angularly in the direction of the adJacent teeth 18 so that these deflected portions o~ the stream inter-cept each other to cause further break-up of the liquid particles. The intercepting portions of the deflected stream divert each other into impingement on ~he sides 23 of the teeth 18 for further particle break-up of the liquid by said impingement, as well as by the interaction of these deflected portions of the stream with the portions of the stream which pass directly into the previously described channels 25 form-ed between adjacent teeth. mus the deflected stream is exposed to a multiple sequence of liquid particle atomization which reduces particle size sufficiently so that the inrush-ing atmospheric air flow can carry the particles toward the center of the discharge stream and restore greater liquid con-tent in ~liS area of the stream pattern. As schematically illustrated in Fig. 6, the resulting conical stream pattern shows a substantial min1mization of the undesirable and characteristic "fingers" created by deliberate obstruction of fluid flow by the prior art form of teeth shown in Fig~ 5.
In Figs. 3 and 4 of the drawing, there is sho~n a modi-fied form of tooth arrangement on the tooth support surface 17 of the pattern sleeve 15. An inner or first row of cir-cumferentially-spaced teeth 26 and a second outer row of cir~
cumferentially spaced teeth 27, in staggered relationship to the teeth 26, is utilized.
Both the tee-th 26 and the teeth 27 have the rounded stream-deflecting surface 22 on the forward portion 21 there~
of Both the teeth 26 ~nd 27 have the flat side portions 23 as in th~ previousl~ described -too1;h l8.
The -teeth 27 o~ the outer row are s-taggered in relation ship to the teeth 26 of the inner row ~nd are preferably dis-posed midway in the channel 25 formed ~y the ad~acent teeth of the inner row. The teeth 27 are elevated abo~e the teeth 26 so as to project outwardly from the surface 17 to a greater extent than the teeth 26. It has been found desirable, though not mandatory, that the teeth 27 be of somewhat small-er dimension thc~n the teeth 26, particularly in width. The teeth are disposed coaxially relatively to the longitudin~1 axis of the pattern sleeve 15 and the discharge stream.
m e utilization of the staggered outer row of teeth 27 provides an additional deflecting and impingement surface for the discharge stream and provides a discharge channel 28 between adjacent teeth 27 in the outer row~ In the larger sizes of fire-fighting nozæles, where the discharge gallonage is of substantial magnitude, the outer row of teeth provides further atomiza-tion and particle break-up of the discharge stream to create the necessary fine particle size which will lend itself to being carried back toward the center of the stream by the jet stream or suction effect previously de scribed~
As illustrated in Fig~ 7 of the drawing, the dispos-tion of the deflecting teeth in staggered coaxial rows results in substantial elimination of the non-homogeneous pattern of characteristic ~Ifingers~ in the wide fog stream and pro-vldes a uni~ormity of stream pa-ttern and liquid content.
In Fi~. 8, there is shown a modified form of tooth 29 having a trian~ular nose por-tion 30 which presents divergen-t flat deflecting surfaces 31 to the liquid s-tream. ~5 in -the case of the rounded stream deflect;ing surfaces 22 o~ the teeth 18, 26 and 27, the angularly directed deflecting sur-faces 31 cause portions of the discharge stre~n to be direct-ed into intercepting relationship with each other and to be diverted into impingement with the fla-t sides 23 of -the teeth.
As in -the case of the previously described rounded stream-deflecting surfaGe 22, the function of the deflecting surfaces 31 is to direct portions of the discharge stream into paths which will cause sufficient atomization of the liquid particles to permit the atmospheric air flow to carry them back toward the center of the discharge stream.
It is to be understood that the forms of my invention, herewith shown and described, are to be taken as preferred examples o~ the same, ~nd that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoined claims.
Claims (5)
1. In a stream-forming pattern sleeve for a cylindrical liquid discharge nozzle, the combination of an angularly extending tooth-supporting surface provided on the end of said sleeve, a first row of upright circumferentially-spaced teeth projecting from said surface into the path of the dis-charge stream, a second row of upright circumferentially spaced teeth projecting from said surface into the path of the discharge stream and radially outwardly of said first row, the teeth of said second row being of lesser width than the teeth of said first row, a stream-deflecting surface pre-sented by each tooth, said stream-deflecting surface having forward portions thereof disposed to deflect said stream angularly toward adjacent teeth, whereby portions of said discharge stream are directed into intercepting relationship with each other to enhance liquid particle break-up of said stream.
2. A combination as defined in Claim 1, wherein said forward portions of said stream-deflecting surface are rounded.
3. A combination as defined in Claim 1, wherein said forward portions of said stream-deflecting surface are of triangular configuration.
4. A combination as defined in Claim 1, wherein the teeth of said second row are circumferentially disposed midway between the teeth of said first row.
5. A combination as defined in Claim 1, wherein the teeth of said second row are elevated above the teeth of said first row.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000330410A CA1117167A (en) | 1979-06-22 | 1979-06-22 | Liquid particle deflector structure for discharge nozzles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000330410A CA1117167A (en) | 1979-06-22 | 1979-06-22 | Liquid particle deflector structure for discharge nozzles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1117167A true CA1117167A (en) | 1982-01-26 |
Family
ID=4114533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000330410A Expired CA1117167A (en) | 1979-06-22 | 1979-06-22 | Liquid particle deflector structure for discharge nozzles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1117167A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2301632A4 (en) * | 2008-06-16 | 2016-03-09 | Yamato Protec Corp | Fire-extinguishing spray nozzle and fire-extinguishing equipment |
-
1979
- 1979-06-22 CA CA000330410A patent/CA1117167A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2301632A4 (en) * | 2008-06-16 | 2016-03-09 | Yamato Protec Corp | Fire-extinguishing spray nozzle and fire-extinguishing equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |