WO2014205255A1 - Ensemble buse de pulvérisation d'atomisation d'air à mélange interne - Google Patents

Ensemble buse de pulvérisation d'atomisation d'air à mélange interne Download PDF

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Publication number
WO2014205255A1
WO2014205255A1 PCT/US2014/043244 US2014043244W WO2014205255A1 WO 2014205255 A1 WO2014205255 A1 WO 2014205255A1 US 2014043244 W US2014043244 W US 2014043244W WO 2014205255 A1 WO2014205255 A1 WO 2014205255A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
cap
passage
atomizing
spray nozzle
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.)
Ceased
Application number
PCT/US2014/043244
Other languages
English (en)
Inventor
Mark Lacroix
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spraying Systems Co
Original Assignee
Spraying Systems Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Spraying Systems Co filed Critical Spraying Systems Co
Publication of WO2014205255A1 publication Critical patent/WO2014205255A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
    • B05B7/0466—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber with means for deflecting the central liquid flow towards the peripheral gas flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0012—Apparatus for achieving spraying before discharge from the apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/265—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being symmetrically deflected about the axis of the nozzle

Definitions

  • the present invention relates generally to spray nozzle assemblies, and more particularly, to internal mix spray nozzle assemblies in which liquid is atomized by pressurized air prior to discharge from the nozzle.
  • Internal mix spray nozzle assemblies are known which utilize pressurized air for breaking down liquid into relatively small particle sizes. Such nozzle assemblies have particular utility in gas scrubbing applications, such as where finely atomized lime slurry or the like is sprayed into a discharging stream of combustion gases for removing sulfur dioxide or other combustion byproducts.
  • Such spray nozzle assemblies commonly direct very finely atomized liquid spray discharges from a plurality of circumferentially spaced discharge orifices of the nozzle so as to generate a conical spray pattern.
  • the high pressure discharging flow streams from the plurality of discharge orifices can cause a negative pressure within the conical spray pattern that draws ambient air and fine liquid particles inwardly back toward the nozzle with resulting strong eddy currents that can create a heavy buildup of particulate matter about the discharge orifices that choke off the spray and significantly degrade performance. This creates the need for frequent costly cleaning of the spray nozzles of such buildup.
  • the negative pressures within the conical spray pattern further tend to draw inwardly the discharging flow streams from the plurality of discharge orifices so as to reduce the size and effective area of the spray coverage.
  • Another object is to provide spray nozzle assembly as characterized above that is effective as an incident to the spray operation for preventing spray particles due to eddy currents within the discharging spray pattern from accumulating on the nozzle about the discharge orifices.
  • a further object is to provide a spray nozzle assembly of the foregoing type which is effective for preventing negative pressures and eddy currents within a conical spray discharge from narrowing the angle of the conical spray pattern and the effective coverage of discharging spray.
  • Still another object is to provide such a spray nozzle assembly that is relatively simple in construction and economical to manufacture.
  • FIG. 1 is a side elevational view of an illustrative internal mix pressurized air atomizing spray nozzle assembly in accordance with the invention
  • FIG. 2 is a downstream end view of the spray nozzle assembly shown in Fig. 1;
  • Fig. 3 is a horizontal section of the illustrated spray nozzle assembly taken in the plane of line 3-3 in Fig. 1;
  • Fig. 4 is a vertical section of the illustrated spray nozzle assembly taken in the plane of line 4-4 in Fig. 2;
  • FIG. 5 is a side elevational view of the air cap of the illustrated spray nozzle assembly.
  • Fig.6 is a perspective of the air guide of the illustrated spray nozzle assembly.
  • FIG. 3 there is shown an illustrative internal-mix, air-atomizing spray nozzle assembly 10 in accordance with the invention connected to a conventional fluid supply manifold 11.
  • the fluid supply manifold 11 in this case includes a central pressurized liquid supply passage 12 and a plurality of pressurized air supply passages 14 in surrounding relation to the liquid supply passage 12.
  • the air passages 14 in this instance communicate with an annular manifold air passage 15 at a downstream end of the fluid supply manifold 11.
  • the illustrated spray nozzle assembly 10 basically comprise a nozzle body 20, a downstream air cap 21, and an air guide 22 interposed between the nozzle body 20 and air cap 21.
  • the nozzle body 20 in this case is in the form of a multipart fluid supply subassembly comprising an outer annular body member 24 and an inner axial liquid supply tube 25 fixed therein which defines a liquid flow passage with a discharge orifice 27.
  • the outer annular body member 24 has an externally threaded, upstream stem 26 secured within a threaded axial bore of the fluid supply manifold 11 with the liquid supply tube 25 in fluid communication with the liquid passage 12.
  • An annular sealing gasket 28 is interposed between the annular body member 24 and the downstream end of the fluid supply manifold 11.
  • the annular body member 24 further is formed with a plurality of circumferentially spaced axial air passageways 29 that communicate between the annular manifold air passage 15 and an air chamber 30 about the liquid supply tube 25.
  • the air cap 21 which in this case has an inwardly curved or tapered end, is secured to the nozzle body 20 by a threaded retaining cap 31 with the air guide 22 retained between an upstream end of the air cap 21 and a downstream end of the outer nozzle body member 24.
  • the air cap 21 in turn retains the air guide 22 in seated relation within a downstream counter bore of the outer annular body member 24.
  • the air guide 22, as best depicted in Fig. 6, has a generally triangular configured upstream end 32 with the rounded corners 33 thereof in seated engagement within the annular body member 24 and flat sides 34 thereof defining air passages 35
  • the annular air passageway 36 directs pressurized air into an expansion chamber 42 within the air cap 21 simultaneously as liquid is directed through and discharges from the downstream discharge orifice 27 of the liquid supply tube 25.
  • the liquid discharging from the liquid supply pipe 25 impacts a transverse impingement surface 44 of an upstanding impingement pin or pintel 45 of the air cap 21 which facilitates both mechanical and air atomized liquid particle breakdown of the liquid as it is dispersed laterally of the impingement surface 44.
  • the lateral liquid dispersion is further broken down and atomized by the annular air flow stream about the impingement surface 44 prior to discharge from the air cap 21 through a plurality of circumferentially spaced discharge orifices 46 disposed in surrounding relation to the impingement pin 45 which effects further liquid particle breakdown and atomization.
  • the atomized liquid discharges from the discharge orifices 46 in the form of a plurality of circumferentially spaced high pressurized streams of atomized particles. Since the discharge orifices 46 are angled outwardly relative to the longitudinal axis of the spray nozzle assembly, the discharging flow streams form a generally conical spray pattern.
  • the spray nozzle assembly has a pressurized air passage system communicating with the atomizing air inlet of the nozzle assembly that directs pressurized purging air externally of the air cap adjacent the discharge orifices for preventing the buildup of particulate matter about the discharge orifices that can impede the efficient discharge of the atomized liquid spray. More particularly, the spray nozzle assembly is designed to actively purge the outer surfaces of the air cap adjacent the discharge orifices by utilizing a small percentage of the atomizing air from within the nozzle assembly which is directed under the retaining ring that holds the air cap in place and along external passageways that communicate between the circumferentially spaced discharge orifices of the air cap.
  • the air cap 21 is formed with a plurality of transverse, in this case radial, diverting air passages 50 (Fig. 3) that communicate with the annular air passage 36 that supplies atomizing air through the air cap 21 of the spray nozzle assembly.
  • the transverse diverting air passages 50 communicate with exterior purging air passages 51 that extend axially along the outer periphery of the air cap 21.
  • the air cap 21 has a fluted outer periphery that defines the plurality of the longitudinal purging air passages 51 in recessed relation to the outer surface of the air cap 21.
  • the longitudinal purging air passages 51 upstream closed sections 5 la of the longitudinal purging passages 51 are defined between the outer periphery of the air cap 21 and an inner cylindrical portion of the retaining ring 30.
  • purging air directed through the radial passages 50 communicates with the closed longitudinal passage sections 5 la.
  • the closed longitudinal passage sections 5 la in turn communicate with open external longitudinal passage sections 5 lb that extend along an inwardly curved downstream end of the air cap 21 and between the discharge orifices 46 to a protruding end 52 of the pintel or impingement pin 45. It has been unexpectedly found that the purging air directed longitudinally along the closed purging air passage sections 51a will continue to follow the exterior passage sections 51b in a downstream direction between the discharging orifices 46 such that the purging air adjacent the terminal end of the air cap 21 effectively breaks up strong eddy currents at that location that normally cause the heavy build of particulate matter about the discharge orifices 46.
  • Purging air also increases the pressure within the conical spray pattern so as to compensate for negative pressures that normally draw the discharging flow streams from the discharge orifices inwardly toward each other. Hence, the purging air further effectively prevents narrowing of the desired spray angle for more efficient and effective coverage.
  • the internal mix air atomizing spray nozzle assembly of the present invention can be highly effective for discharging liquids, such as lime slurries and the like, in gas scrubbing and other applications without undesirable buildup of residues about the discharge orifices of the air cap that can impede spray performance and require frequent cleaning.
  • the external purging air effectively reduces negative pressure and resulting eddy currents within the discharging spray pattern that create such particle build up and which narrows the effective coverage of the spray nozzle assembly.
  • the spray nozzle assembly is relatively simple in construction and lends itself to economical manufacture.

Landscapes

  • Nozzles (AREA)

Abstract

Ensemble buse de pulvérisation d'atomisation d'air comprenant un corps de buse doté d'un chapeau d'air en aval dans lequel le liquide comprimé et l'air d'atomisation sont dirigés et possédant une pluralité d'orifices de sortie circonférentiellement espacés depuis lesquels est dirigé le liquide atomisé. Le chapeau d'air possède une pluralité de passages d'air externes longitudinaux s'étendant le long d'une surface extérieure destinés à recevoir une partie déviée d'air d'atomisation dirigée vers le chapeau d'air et à diriger l'air de purge vers des endroits situés entre les orifices de sortie circonférentiellement espacés du chapeau d'air pour réduire au minimum l'accumulation de liquide atomisé autour de la surface extérieure du chapeau d'air.
PCT/US2014/043244 2013-06-19 2014-06-19 Ensemble buse de pulvérisation d'atomisation d'air à mélange interne Ceased WO2014205255A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361836710P 2013-06-19 2013-06-19
US61/836,710 2013-06-19

Publications (1)

Publication Number Publication Date
WO2014205255A1 true WO2014205255A1 (fr) 2014-12-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/043244 Ceased WO2014205255A1 (fr) 2013-06-19 2014-06-19 Ensemble buse de pulvérisation d'atomisation d'air à mélange interne

Country Status (1)

Country Link
WO (1) WO2014205255A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022121605A1 (fr) * 2020-12-10 2022-06-16 深圳市普渡科技有限公司 Structure de conduit d'air d'atomiseur, atomiseur et robot de désinfection
US11534728B2 (en) * 2018-11-15 2022-12-27 Caterpillar Inc. Reductant nozzle with helical channel design
EP3855958B1 (fr) 2018-09-24 2024-10-30 Imperial Tobacco Limited Dispositif de distribution d'aérosol

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656218A (en) * 1949-07-21 1953-10-20 John F Campbell Spray nozzle
US6012647A (en) * 1997-12-01 2000-01-11 3M Innovative Properties Company Apparatus and method of atomizing and vaporizing
US7028867B2 (en) * 2003-10-30 2006-04-18 Nordson Corporation Conformal coating applicator and method
US20100116900A1 (en) * 2008-11-11 2010-05-13 Dieter Wurz Two-substance nozzle, cluster nozzle and method for the atomization of fluids
KR101122289B1 (ko) * 2010-05-28 2012-03-21 스프레이시스템캄파니코리아 유한회사 내부 혼합식 분무 노즐

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656218A (en) * 1949-07-21 1953-10-20 John F Campbell Spray nozzle
US6012647A (en) * 1997-12-01 2000-01-11 3M Innovative Properties Company Apparatus and method of atomizing and vaporizing
US7028867B2 (en) * 2003-10-30 2006-04-18 Nordson Corporation Conformal coating applicator and method
US20100116900A1 (en) * 2008-11-11 2010-05-13 Dieter Wurz Two-substance nozzle, cluster nozzle and method for the atomization of fluids
KR101122289B1 (ko) * 2010-05-28 2012-03-21 스프레이시스템캄파니코리아 유한회사 내부 혼합식 분무 노즐

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3855958B1 (fr) 2018-09-24 2024-10-30 Imperial Tobacco Limited Dispositif de distribution d'aérosol
US11534728B2 (en) * 2018-11-15 2022-12-27 Caterpillar Inc. Reductant nozzle with helical channel design
WO2022121605A1 (fr) * 2020-12-10 2022-06-16 深圳市普渡科技有限公司 Structure de conduit d'air d'atomiseur, atomiseur et robot de désinfection

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