EP1042072A1 - Spray nozzle with static means for inhibiting outflow - Google Patents

Spray nozzle with static means for inhibiting outflow

Info

Publication number
EP1042072A1
EP1042072A1 EP98959100A EP98959100A EP1042072A1 EP 1042072 A1 EP1042072 A1 EP 1042072A1 EP 98959100 A EP98959100 A EP 98959100A EP 98959100 A EP98959100 A EP 98959100A EP 1042072 A1 EP1042072 A1 EP 1042072A1
Authority
EP
European Patent Office
Prior art keywords
coaxial
spray nozzle
fluid
swirl chamber
outlet passage
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.)
Granted
Application number
EP98959100A
Other languages
German (de)
French (fr)
Other versions
EP1042072B1 (en
Inventor
Jean René BICKART
Pascal Meyer
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.)
Verbena Corp NV
Original Assignee
Verbena Corp NV
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 Verbena Corp NV filed Critical Verbena Corp NV
Publication of EP1042072A1 publication Critical patent/EP1042072A1/en
Application granted granted Critical
Publication of EP1042072B1 publication Critical patent/EP1042072B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3421—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber
    • B05B1/3431—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber the channels being formed at the interface of cooperating elements, e.g. by means of grooves
    • B05B1/3436—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber the channels being formed at the interface of cooperating elements, e.g. by means of grooves the interface being a plane perpendicular to the outlet axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant

Definitions

  • the present invention relates to liquid spray nozzles, which can be used in the most diverse applications such as, for example, spray pumps, vaporizers, nozzles for combustion burners, injectors for internal combustion engines.
  • the invention applies more particularly to spray nozzles in which the liquid to be sprayed is brought into a central swirl chamber by lateral channels for admitting fluid tangentially injecting the liquid which then exits in an axial direction of exit by a coaxial outlet passage out of the central vortex chamber.
  • the swirl chamber is conical, and the liquid is injected tangentially along the conical peripheral wall of the chamber in an oblique direction oriented towards 1 before.
  • the outlet has a rounded lip.
  • a blind posterior coaxial recess is provided in the rear wall of the swirl chamber, with a diameter smaller than that of the outlet orifice, in order to stabilize the spray cone at the outlet of the nozzle.
  • One known solution consists in providing a valve at the inlet of the spray nozzle. This solution is however expensive, a source of blockages, and it disturbs the operation by introducing a threshold effect at startup. Such a valve also requires the provision of upstream fluid pressures which are sufficient for its correct operation, that is to say significantly greater than the pressure necessary for the operation of the nozzle itself.
  • the problem proposed by the present invention is to design a static and inexpensive means of inhibiting flow out of the spray nozzle as soon as its supply is interrupted.
  • the invention results from the surprising observation that, during the operation of a spray nozzle with central swirl chamber, if a swirl of liquid is produced in the swirl chamber in a plane generally perpendicular to the axis of the outlet orifice and if a sufficiently large posterior coaxial recess is provided, the residual flow out of the nozzle is inhibited as soon as the nozzle is no longer supplied with liquid.
  • the invention provides a spray nozzle having:
  • a central vortex chamber limited by a peripheral wall of revolution with a longitudinal axis, by a front wall with coaxial outlet passage, and by a rear wall, - at least one lateral channel for admitting fluid into the peripheral wall, open in the central swirl chamber and shaped to tangentially inject the fluid into the swirl chamber,
  • the lateral fluid inlet channel or channels are shaped to inject the fluid into the swirl chamber in a direction substantially perpendicular to the longitudinal axis
  • the rear coaxial recess is dimensioned and shaped so as to inhibit any residual flow of fluid through the coaxial outlet passage as soon as the supply of fluid is interrupted at the inlet of the spray nozzle.
  • the posterior coaxial recess is of revolution around said longitudinal axis. It has been observed that good results in inhibiting residual liquid flow are obtained by providing a posterior coaxial recess having a diameter greater than the diameter of the coaxial outlet passage, more advantageously between 1.2 and 2 times the diameter of the coaxial output passage.
  • the posterior coaxial recess may have a length between once and five times the length of the coaxial outlet passage.
  • Too short lengths do not produce inhibition of residual flow. Too long lengths apparently have no additional effect.
  • FIG. 1 is a partial side view in longitudinal section of a spray nozzle according to a particular embodiment of the invention
  • FIG. 2 is a cross section along the plane P-P of Figure 1;
  • FIG. 3 is a cross section along the same plane P-P of a spray nozzle according to another embodiment of one invention.
  • FIG. 4 is a side view in enlarged longitudinal section showing a swirl chamber according to an embodiment of the invention
  • FIG. 5 is an enlarged front view of the swirl chamber zone of FIG. 4.
  • a spray nozzle in the embodiment illustrated in FIG. 1, comprises a central swirl chamber 1 limited by a peripheral wall 2 of revolution of longitudinal axis II, by a front wall 3 having a coaxial outlet passage 4, and through a rear wall 5.
  • the fluid is brought into the swirl chamber 1, from an outlet 6, by at least one lateral fluid intake channel 7 formed in the peripheral wall 2, open in the central swirl chamber 1, and shaped to tangentially inject the fluid into the swirl chamber 1 in a direction substantially perpendicular to the longitudinal axis II.
  • there occurs in the swirl chamber 1 a fluid vortex in a plane substantially perpendicular to the longitudinal axis I-I of the swirl chamber.
  • the rear wall 5 of the swirl chamber 1 comprises a rear coaxial recess 8 dimensioned and shaped so as to inhibit any residual flow of fluid through the coaxial outlet passage 4 from the interruption of fluid supply to the inlet 6 of the spray nozzle.
  • the posterior coaxial recess 8 is of revolution around the longitudinal axis I-I. Its diameter De is greater than the diameter Ds of the coaxial outlet passage 4, and less than twice the value of said diameter Ds of the coaxial outlet passage 4.
  • the fluid penetrates through the tangential lateral channels such as the channel 7, enters in a vortex in the swirl chamber 1 around the longitudinal axis II in a plane substantially perpendicular to said axis, then exits axially by the coaxial outlet passage 4. It may be advantageous to choose a length Le of the posterior coaxial recess 8 which is just sufficient for obtain the desired effect of inhibiting residual flow, without limiting its length, but without excess.
  • the inhibition of residual liquid flow can be further improved by providing a posterior frontal annular rib 9 bordering the entry of the coaxial outlet passage 4 in the swirl chamber 1, as best seen in FIG. 4.
  • a rib of which 1 'radial thickness and 1 axial thickness are about 100 microns gives good results. Other values can be chosen depending on the flow and liquid pressure conditions.
  • the coaxial outlet passage 4 is a cone section whose half-angle at the apex A is between approximately 0 ° and 3 ° and converges towards the outlet, as illustrated in FIG. 4.
  • the invention applies to a spray nozzle which may have various structures for swirling the fluid, that is to say having at least one lateral tangential fluid inlet channel 7.
  • a spray nozzle which may have various structures for swirling the fluid, that is to say having at least one lateral tangential fluid inlet channel 7.
  • the invention also applies to spray nozzles with a multi-stage intake circuit, such as that illustrated for example in FIG. 3, in which the lateral intake channels 7, 7a and 7b in the swirl chamber 1 start from a common intermediate coaxial annular chamber 10 itself connected to the inlet 6 of the nozzle by a plurality of intermediate lateral channels such as channels 11a, 11b and 11e tangentially injecting the fluid into the common intermediate coaxial annular chamber 10 so as to rotate the fluid in the opposite direction of its rotation in the swirl chamber 1.
  • a multi-stage intake circuit such as that illustrated for example in FIG. 3, in which the lateral intake channels 7, 7a and 7b in the swirl chamber 1 start from a common intermediate coaxial annular chamber 10 itself connected to the inlet 6 of the nozzle by a plurality of intermediate lateral channels such as channels 11a, 11b and 11e tangentially injecting the fluid into the common intermediate coaxial annular chamber 10 so as to rotate the fluid in the opposite direction of its rotation in the swirl chamber 1.
  • the diameter De of the swirl chamber 1 is greater than the length Le of said swirl chamber 1.

Landscapes

  • Nozzles (AREA)
  • Catching Or Destruction (AREA)
  • Reciprocating Pumps (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention concerns a spray nozzle comprising a central swirl chamber (1) in which the fluid to be sprayed penetrates by tangential channels (7) producing a swirl axis perpendicular to the longitudinal axis (I-I). The fluid comes out of the swirl chamber (1) through a coaxial outlet passage (4). The nozzle comprises a rear coaxial recess (8) dimensioned and shaped so as to inhibit any residual outflow of fluid through the coaxial outlet passage (4) when the fluid supply is interrupted at the spray nozzle inlet (6).

Description

BUSE DE PULVERISATION A MOYEN STATIQUE D'INHIBITION D'ECOULEMENT SPRAY NOZZLE WITH STATIC MEANS OF FLOW INHIBITION
DOMAINE TECHNIQUE DE L'INVENTION La présente invention concerne les buses de pulvérisation de liquide, susceptibles d'être utilisées dans les applications les plus diverses telles que par exemple des pompes de pulvérisation, des vaporisateurs, des gicleurs pour brûleurs de combustion, des injecteurs de moteurs à combustion interne. L'invention s'applique plus particulièrement aux buses de pulvérisation dans lesquelles le liquide à pulvériser est amené dans une chambre centrale de tourbillonnement par des canaux latéraux d'admission de fluide injectant tangentiellement le liquide qui sort ensuite selon une direction axiale de sortie par un passage coaxial de sortie hors de la chambre centrale de tourbillonnement .TECHNICAL FIELD OF THE INVENTION The present invention relates to liquid spray nozzles, which can be used in the most diverse applications such as, for example, spray pumps, vaporizers, nozzles for combustion burners, injectors for internal combustion engines. The invention applies more particularly to spray nozzles in which the liquid to be sprayed is brought into a central swirl chamber by lateral channels for admitting fluid tangentially injecting the liquid which then exits in an axial direction of exit by a coaxial outlet passage out of the central vortex chamber.
Un exemple de buse de pulvérisation connue est décrit dans le document FR 2 324 986. Dans cette buse, la chambre de tourbillonnement est conique, et le liquide est injecté tangentiellement le long de la paroi périphérique conique de chambre selon une direction oblique orientée vers 1 ' avant . L'orifice de sortie comporte une lèvre arrondie. Un évidement coaxial postérieur borgne est prévu dans la paroi postérieure de la chambre de tourbillonnement, selon un diamètre inférieur à celui de l'orifice de sortie, dans le but de stabiliser le cône de pulvérisation en sortie de la buse.An example of a known spray nozzle is described in the document FR 2 324 986. In this nozzle, the swirl chamber is conical, and the liquid is injected tangentially along the conical peripheral wall of the chamber in an oblique direction oriented towards 1 before. The outlet has a rounded lip. A blind posterior coaxial recess is provided in the rear wall of the swirl chamber, with a diameter smaller than that of the outlet orifice, in order to stabilize the spray cone at the outlet of the nozzle.
Ces buses de pulvérisation à chambre centrale de tourbillonnement assurent généralement une bonne pulvérisation du liquide. Un problème rencontré, lors de l'utilisation de ces buses connues est que, en fin d'une étape de pulvérisation, lorsqu'on interrompt l'alimentation de la buse, un écoulement résiduel de fluide se produit en sortie de la buse, sous forme d'une ou plusieurs gouttes de grosse dimension, non pulvérisées. Dans les applications à la combustion, cela conduit à une augmentation du taux en oxyde de carbone et du taux d'hydrocarbures dans les gaz d'échappement, et à l'encrassement des parois d'échange thermique qui réduit ensuite la transmission thermique et affecte le rendement de l'installation.These spray nozzles with central swirl chamber generally ensure good spraying of the liquid. A problem encountered when using these known nozzles is that, at the end of a spraying step, when the supply to the nozzle is interrupted, a residual flow of fluid occurs at the outlet of the nozzle, under form of one or more large drops, not sprayed. In combustion applications, this leads to an increase in the rate of carbon monoxide and the rate of hydrocarbons in the exhaust gases, and in the fouling of the walls. heat exchange which then reduces thermal transmission and affects the efficiency of the installation.
Une solution connue consiste à prévoir un clapet à l'entrée de la buse de pulvérisation. Cette solution est toutefois onéreuse, source d'obturations, et elle perturbe le fonctionnement en introduisant un effet de seuil au démarrage. Un tel clapet oblige en outre à prévoir des pressions de fluide en amont qui sont suffisantes pour son fonctionnement correct, c'est-à-dire nettement supérieures à la pression nécessaire pour le fonctionnement de la buse elle-même.One known solution consists in providing a valve at the inlet of the spray nozzle. This solution is however expensive, a source of blockages, and it disturbs the operation by introducing a threshold effect at startup. Such a valve also requires the provision of upstream fluid pressures which are sufficient for its correct operation, that is to say significantly greater than the pressure necessary for the operation of the nozzle itself.
EXPOSE DE L'INVENTION Le problème proposé par la présente invention est de concevoir un moyen statique et peu onéreux d'inhibition d'écoulement hors de la buse de pulvérisation dès l'interruption de son alimentation.PRESENTATION OF THE INVENTION The problem proposed by the present invention is to design a static and inexpensive means of inhibiting flow out of the spray nozzle as soon as its supply is interrupted.
L'invention résulte de l'observation surprenante selon laquelle, en cours de fonctionnement d'une buse de pulvérisation à chambre centrale de tourbillonnement, si l'on réalise dans la chambre de tourbillonnement un tourbillon de liquide dans un plan généralement perpendiculaire à l'axe de l'orifice de sortie et si on prévoit un évidement coaxial postérieur de diamètre suffisamment grand, on inhibe l'écoulement résiduel hors de la buse dès l'interruption d'alimentation de la buse en liquide.The invention results from the surprising observation that, during the operation of a spray nozzle with central swirl chamber, if a swirl of liquid is produced in the swirl chamber in a plane generally perpendicular to the axis of the outlet orifice and if a sufficiently large posterior coaxial recess is provided, the residual flow out of the nozzle is inhibited as soon as the nozzle is no longer supplied with liquid.
Pour cela, l'invention prévoit une buse de pulvérisation ayant :For this, the invention provides a spray nozzle having:
- une chambre centrale de tourbillonnement limitée par une paroi périphérique de révolution à axe longitudinal, par une paroi antérieure à passage coaxial de sortie, et par une paroi postérieure, - au moins un canal latéral d'admission de fluide dans la paroi périphérique, ouvert dans la chambre centrale de tourbillonnement et conformé pour injecter tangentiellement le fluide dans la chambre de tourbillonnement,- a central vortex chamber limited by a peripheral wall of revolution with a longitudinal axis, by a front wall with coaxial outlet passage, and by a rear wall, - at least one lateral channel for admitting fluid into the peripheral wall, open in the central swirl chamber and shaped to tangentially inject the fluid into the swirl chamber,
- un évidement coaxial postérieur prévu dans la paroi postérieure de la chambre de tourbillonnement .- a rear coaxial recess provided in the rear wall of the swirl chamber.
En outre : - le ou les canaux latéraux d'admission de fluide sont conformés pour injecter le fluide dans la chambre de tourbillonnement selon une direction sensiblement perpendiculaire à l'axe longitudinal,In addition : the lateral fluid inlet channel or channels are shaped to inject the fluid into the swirl chamber in a direction substantially perpendicular to the longitudinal axis,
- l' évidement coaxial postérieur est dimensionné et conformé de façon à inhiber tout écoulement résiduel de fluide par le passage coaxial de sortie dès l'interruption d'alimentation en fluide à l'entrée de la buse de pulvérisation.- The rear coaxial recess is dimensioned and shaped so as to inhibit any residual flow of fluid through the coaxial outlet passage as soon as the supply of fluid is interrupted at the inlet of the spray nozzle.
De préférence, l' évidement coaxial postérieur est de révolution autour dudit axe longitudinal. On a pu constater que de bons résultats d'inhibition d'écoulement résiduel de liquide sont obtenus en prévoyant un évidement coaxial postérieur ayant un diamètre supérieur au diamètre du passage coaxial de sortie, plus avantageusement compris entre 1,2 et 2 fois le diamètre du passage coaxial de sortie. En pratique, l' évidement coaxial postérieur peut avoir une longueur comprise entre une fois et cinq fois la longueur du passage coaxial de sortie.Preferably, the posterior coaxial recess is of revolution around said longitudinal axis. It has been observed that good results in inhibiting residual liquid flow are obtained by providing a posterior coaxial recess having a diameter greater than the diameter of the coaxial outlet passage, more advantageously between 1.2 and 2 times the diameter of the coaxial output passage. In practice, the posterior coaxial recess may have a length between once and five times the length of the coaxial outlet passage.
Des longueurs trop courtes ne produisent pas 1 ' inhibition de l'écoulement résiduel. Des longueurs trop longues n'ont apparemment pas d'effet supplémentaire.Too short lengths do not produce inhibition of residual flow. Too long lengths apparently have no additional effect.
DESCRIPTION SOMMAIRE DES DESSINS D'autres objets, caractéristiques et avantages de la présente invention ressortiront de la description suivante de modes de réalisation particuliers, faite en relation avec les figures jointes, parmi lesquelles:SUMMARY DESCRIPTION OF THE DRAWINGS Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, made in relation to the attached figures, among which:
- la figure 1 est une vue de côté partielle en coupe longitudinale d'une buse de pulvérisation selon un mode de réalisation particulier de l'invention ;- Figure 1 is a partial side view in longitudinal section of a spray nozzle according to a particular embodiment of the invention;
- la figure 2 est une coupe transversale selon le plan P-P de la figure 1 ;- Figure 2 is a cross section along the plane P-P of Figure 1;
- la figure 3 est une coupe transversale selon le même plan P-P d'une buse de pulvérisation selon un autre mode de réalisation de 1 ' invention ;- Figure 3 is a cross section along the same plane P-P of a spray nozzle according to another embodiment of one invention;
- la figure 4 est une vue de côté en coupe longitudinale agrandie montrant une chambre de tourbillonnement selon un mode de réalisation de l'invention ; et - la figure 5 est une vue de face agrandie de la zone de chambre de tourbillonnement de la figure 4.- Figure 4 is a side view in enlarged longitudinal section showing a swirl chamber according to an embodiment of the invention; and FIG. 5 is an enlarged front view of the swirl chamber zone of FIG. 4.
DESCRIPTION DES MODES DE REALISATION PREFERES Dans le mode de réalisation illustré sur la figure 1, une buse de pulvérisation selon l'invention comprend une chambre centrale de tourbillonnement 1 limitée par une paroi périphérique 2 de révolution d'axe longitudinal I-I, par une paroi antérieure 3 ayant un passage coaxial de sortie 4, et par une paroi postérieure 5. Le fluide est amené dans la chambre de tourbillonnement 1, à partir d'une sortie 6, par au moins un canal latéral d'admission de fluide 7 ménagé dans la paroi périphérique 2, ouvert dans la chambre centrale de tourbillonnement 1, et conformé pour injecter tangentiellement le fluide dans la chambre de tourbillonnement 1 selon une direction sensiblement perpendiculaire à l'axe longitudinal I-I. Ainsi, il se produit dans la chambre de tourbillonnement 1 un tourbillon de fluide dans un plan sensiblement perpendiculaire à l'axe longitudinal I-I de la chambre de tourbillonnement.DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment illustrated in FIG. 1, a spray nozzle according to the invention comprises a central swirl chamber 1 limited by a peripheral wall 2 of revolution of longitudinal axis II, by a front wall 3 having a coaxial outlet passage 4, and through a rear wall 5. The fluid is brought into the swirl chamber 1, from an outlet 6, by at least one lateral fluid intake channel 7 formed in the peripheral wall 2, open in the central swirl chamber 1, and shaped to tangentially inject the fluid into the swirl chamber 1 in a direction substantially perpendicular to the longitudinal axis II. Thus, there occurs in the swirl chamber 1 a fluid vortex in a plane substantially perpendicular to the longitudinal axis I-I of the swirl chamber.
La paroi postérieure 5 de la chambre de tourbillonnement 1 comprend un évidement coaxial postérieur 8 dimensionné et conformé de façon à inhiber tout écoulement résiduel de fluide par le passage coaxial de sortie 4 dès l'interruption d'alimentation en fluide à l'entrée 6 de la buse de pulvérisation.The rear wall 5 of the swirl chamber 1 comprises a rear coaxial recess 8 dimensioned and shaped so as to inhibit any residual flow of fluid through the coaxial outlet passage 4 from the interruption of fluid supply to the inlet 6 of the spray nozzle.
Comme on le voit mieux à plus grande échelle sur les figures 4 et 5, l' évidement coaxial postérieur 8 est de révolution autour de l'axe longitudinal I-I. Son diamètre De est supérieur au diamètre Ds du passage coaxial de sortie 4, et inférieur à deux fois la valeur dudit diamètre Ds de passage coaxial de sortie 4.As best seen on a larger scale in Figures 4 and 5, the posterior coaxial recess 8 is of revolution around the longitudinal axis I-I. Its diameter De is greater than the diameter Ds of the coaxial outlet passage 4, and less than twice the value of said diameter Ds of the coaxial outlet passage 4.
Lors du fonctionnement de la buse de pulvérisation, le fluide pénètre par les canaux latéraux tangentiels tels que le canal 7, entre en tourbillon dans la chambre de tourbillonnement 1 autour de l'axe longitudinal I-I dans un plan sensiblement perpendiculaire audit axe, puis sort axialement par le passage coaxial de sortie 4. On peut trouver intérêt à choisir une longueur Le d' évidement coaxial postérieur 8 qui soit juste suffisante pour obtenir l'effet recherché d'inhibition d'écoulement résiduel, sans en limiter la longueur, mais sans excès.During the operation of the spray nozzle, the fluid penetrates through the tangential lateral channels such as the channel 7, enters in a vortex in the swirl chamber 1 around the longitudinal axis II in a plane substantially perpendicular to said axis, then exits axially by the coaxial outlet passage 4. It may be advantageous to choose a length Le of the posterior coaxial recess 8 which is just sufficient for obtain the desired effect of inhibiting residual flow, without limiting its length, but without excess.
En pratique, on peut généralement choisir une longueur Le comprise entre une fois et cinq fois la longueur Ls du passage coaxial de sortie 4, et de préférence comprise entre quatre fois et cinq fois cette longueur.In practice, it is generally possible to choose a length Le of between once and five times the length Ls of the coaxial outlet passage 4, and preferably of between four times and five times this length.
A titre d'exemple non limitatif, des résultats satisfaisants ont été obtenus avec des buses de pulvérisation dans lesquelles Le est de 600 microns à 900 microns, Ls est d'environ 250 microns, Ds est de 160 microns à 240 microns. Ces valeurs ne sont pas limitatives, car de bons résultats peuvent être obtenus au delà des limites indiquées.By way of nonlimiting example, satisfactory results have been obtained with spray nozzles in which Le is from 600 microns to 900 microns, Ls is around 250 microns, Ds is from 160 microns to 240 microns. These values are not limitative, because good results can be obtained beyond the limits indicated.
On peut encore améliorer l'inhibition d'écoulement résiduel de liquide en prévoyant une nervure annulaire frontale postérieure 9 bordant l'entrée du passage coaxial de sortie 4 dans la chambre de tourbillonnement 1, comme mieux visible sur la figure 4. Une nervure dont 1 ' épaisseur radiale et 1 ' épaisseur axiale sont d'environ 100 microns donne de bons résultats. D'autres valeurs pourront être choisies en fonction des conditions de débit et de pression de liquide.The inhibition of residual liquid flow can be further improved by providing a posterior frontal annular rib 9 bordering the entry of the coaxial outlet passage 4 in the swirl chamber 1, as best seen in FIG. 4. A rib of which 1 'radial thickness and 1 axial thickness are about 100 microns gives good results. Other values can be chosen depending on the flow and liquid pressure conditions.
De préférence, le passage coaxial de sortie 4 est un tronçon de cône dont le demi-angle au sommet A est compris entre 0° et 3° environ et converge vers la sortie, comme illustré sur la figure 4. L'invention s'applique à une buse de pulvérisation pouvant avoir des structures diverses de mise en tourbillon du fluide, c'est-à-dire ayant au moins un canal latéral d'admission de fluide 7 tangentiel. De préférence, comme illustré sur la figure 2, on peut prévoir une pluralité de canaux latéraux d'admission 7, 7a et 7b régulièrement répartis en périphérie de la chambre de tourbillonnement 1.Preferably, the coaxial outlet passage 4 is a cone section whose half-angle at the apex A is between approximately 0 ° and 3 ° and converges towards the outlet, as illustrated in FIG. 4. The invention applies to a spray nozzle which may have various structures for swirling the fluid, that is to say having at least one lateral tangential fluid inlet channel 7. Preferably, as illustrated in FIG. 2, it is possible to provide a plurality of lateral intake channels 7, 7a and 7b regularly distributed around the periphery of the swirl chamber 1.
L'invention s'applique également à des buses de pulvérisation à circuit d'admission à plusieurs étages, telles que celle illustrée par exemple sur la figure 3 , dans laquelle les canaux latéraux d'admission 7, 7a et 7b dans la chambre de tourbillonnement 1 partent d'une chambre annulaire coaxiale intermédiaire commune 10 elle-même reliée à l'entrée 6 de la buse par une pluralité de canaux latéraux intermédiaires tels que les canaux lia, 11b et lie injectant tangentiellement le fluide dans la chambre annulaire coaxiale intermédiaire commune 10 de façon à faire tourner le fluide dans le sens opposé de sa rotation dans la chambre de tourbillonnement 1.The invention also applies to spray nozzles with a multi-stage intake circuit, such as that illustrated for example in FIG. 3, in which the lateral intake channels 7, 7a and 7b in the swirl chamber 1 start from a common intermediate coaxial annular chamber 10 itself connected to the inlet 6 of the nozzle by a plurality of intermediate lateral channels such as channels 11a, 11b and 11e tangentially injecting the fluid into the common intermediate coaxial annular chamber 10 so as to rotate the fluid in the opposite direction of its rotation in the swirl chamber 1.
On pourra naturellement prévoir un nombre de canaux latéraux d'admission différent de 1 ou de 3 ou plus, et un nombre d'étages différent de 1 ou 2.It will naturally be possible to provide a number of lateral intake channels different from 1 or 3 or more, and a number of stages different from 1 or 2.
Dans la réalisation illustrée sur la figure 4, qui donne de bons résultats, le diamètre De de la chambre de tourbillonnement 1 est supérieur à la longueur Le de ladite chambre de tourbillonnement 1.In the embodiment illustrated in FIG. 4, which gives good results, the diameter De of the swirl chamber 1 is greater than the length Le of said swirl chamber 1.
La présente invention n'est pas limitée aux modes de réalisation qui ont été explicitement décrits, mais elle en inclut les diverses variantes et généralisations contenues dans le domaine des revendications ci-après. The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof contained in the field of claims below.

Claims

REVENDICATIONS
1 - Buse de pulvérisation ayant :1 - Spray nozzle having:
- une chambre centrale de tourbillonnement (1) limitée par une paroi périphérique (2) de révolution à axe longitudinal (I-I) , par une paroi antérieure (3) à passage coaxial de sortie (4) , et par une paroi postérieure (5) ,- a central swirl chamber (1) bounded by a peripheral wall (2) of revolution with longitudinal axis (II), by a front wall (3) with coaxial outlet passage (4), and by a rear wall (5) ,
- au moins un canal latéral d'admission de fluide (7) dans la paroi périphérique (2) , ouvert dans la chambre centrale de tourbillonnement (1) et conformé pour injecter tangentiellement le fluide dans la chambre de tourbillonnement (1) , un évidement coaxial postérieur (8) prévu dans la paroi postérieure (5) de la chambre de tourbillonnement (1) , caractérisée en ce que : le ou les canaux latéraux d'admission de fluide (7) sont conformés pour injecter le fluide dans la chambre de tourbillonnement (1) selon une direction sensiblement perpendiculaire à l'axe longitudinal (I-I),- at least one lateral fluid intake channel (7) in the peripheral wall (2), open in the central swirl chamber (1) and shaped to tangentially inject the fluid into the swirl chamber (1), a recess posterior coaxial (8) provided in the posterior wall (5) of the swirl chamber (1), characterized in that: the lateral fluid inlet channel (s) (7) are shaped to inject the fluid into the swirling (1) in a direction substantially perpendicular to the longitudinal axis (II),
- l' évidement coaxial postérieur (8) est dimensionné et conformé de façon à inhiber tout écoulement résiduel de fluide par le passage coaxial de sortie (4) dès l'interruption d'alimentation en fluide à l'entrée (6) de la buse de pulvérisation.- the rear coaxial recess (8) is dimensioned and shaped so as to inhibit any residual flow of fluid through the coaxial outlet passage (4) upon interruption of the supply of fluid to the inlet (6) of the nozzle spray.
2 - Buse de pulvérisation selon la revendication 1, caractérisée en ce que l' évidement coaxial postérieur (8) est de révolution autour de l'axe longitudinal (I-I). 3 - Buse de pulvérisation selon l'une des revendications 1 ou 2, caractérisée en ce que l' évidement coaxial postérieur (8) a un diamètre (De) supérieur au diamètre (Ds) du passage coaxial de sortie (4) , et inférieur à deux fois la valeur dudit diamètre (Ds) de passage coaxial de sortie (4) . 4 - Buse de pulvérisation selon la revendication 3 , caractérisée en ce que l' évidement coaxial postérieur (8) a un diamètre (De) compris entre 1,2 fois et 2 fois la valeur du diamètre (Ds) du passage coaxial de sortie (4) .2 - Spray nozzle according to claim 1, characterized in that the rear coaxial recess (8) is of revolution about the longitudinal axis (I-I). 3 - Spray nozzle according to one of claims 1 or 2, characterized in that the rear coaxial recess (8) has a diameter (De) greater than the diameter (Ds) of the coaxial outlet passage (4), and less twice the value of said outlet coaxial passage diameter (Ds) (4). 4 - Spray nozzle according to claim 3, characterized in that the rear coaxial recess (8) has a diameter (De) of between 1.2 times and 2 times the value of the diameter (Ds) of the coaxial outlet passage ( 4).
5 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 4, caractérisée en ce que l' évidement coaxial postérieur (8) a une longueur (Le) choisie voisine de sa valeur minimale juste suffisante pour obtenir l'effet recherché d'inhibition de l'écoulement résiduel de liquide.5 - Spray nozzle according to any one of claims 1 to 4, characterized in that the posterior coaxial recess (8) has a length (Le) chosen close to its value just sufficient to achieve the desired effect of inhibiting the residual flow of liquid.
6 - Buse de pulvérisation selon la revendication 5, caractérisée en ce que l' évidement coaxial postérieur (8) a une longueur (Le) comprise entre une fois et cinq fois la longueur (Ls) du passage coaxial de sortie (4) .6 - Spray nozzle according to claim 5, characterized in that the rear coaxial recess (8) has a length (Le) between once and five times the length (Ls) of the coaxial outlet passage (4).
7 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'une nervure annulaire frontale postérieure (9) borde l'entrée du passage coaxial de sortie (4) dans la chambre de tourbillonnement (1) .7 - Spray nozzle according to any one of claims 1 to 6, characterized in that a rear frontal annular rib (9) borders the entry of the coaxial outlet passage (4) in the swirl chamber (1).
8 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le passage coaxial de sortie (4) est un tronçon de cône dont le demi-angle au sommet (A) est compris entre 0° et 3° environ et converge vers la sortie. 9 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'elle comprend une pluralité de canaux latéraux d'admission (7, 7a, 7b) régulièrement répartis en périphérie de la chambre de tourbillonnement (1) .8 - Spray nozzle according to any one of claims 1 to 7, characterized in that the coaxial outlet passage (4) is a cone section whose half-angle at the top (A) is between 0 ° and 3 ° approximately and converges towards the exit. 9 - Spray nozzle according to any one of claims 1 to 8, characterized in that it comprises a plurality of lateral inlet channels (7, 7a, 7b) regularly distributed around the periphery of the swirl chamber (1) .
10 - Buse de pulvérisation selon la revendication 9, caractérisée en ce que les canaux latéraux d'admission (7, 7a, 7b) partent d'une chambre annulaire coaxiale intermédiaire commune (10) elle-même reliée à l'entrée (6) de la buse par une pluralité de canaux latéraux intermédiaires (lia, 11b, lie) injectant tangentiellement le fluide dans la chambre annulaire coaxiale intermédiaire commune (10) de façon à faire tourner le fluide dans le sens opposé de sa rotation dans la chambre de tourbillonnement (1). 10 - Spray nozzle according to claim 9, characterized in that the lateral inlet channels (7, 7a, 7b) start from a common intermediate coaxial annular chamber (10) itself connected to the inlet (6) of the nozzle by a plurality of intermediate lateral channels (11a, 11b, lie) tangentially injecting the fluid into the common intermediate coaxial annular chamber (10) so as to rotate the fluid in the opposite direction of its rotation in the swirl chamber (1).
EP98959100A 1997-12-24 1998-12-22 Spray nozzle with static means for inhibiting outflow Expired - Lifetime EP1042072B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9716748 1997-12-24
FR9716748A FR2772644B1 (en) 1997-12-24 1997-12-24 SPRAY NOZZLE WITH STATIC MEANS OF FLOW INHIBITION
PCT/IB1998/002101 WO1999033572A1 (en) 1997-12-24 1998-12-22 Spray nozzle with static means for inhibiting outflow

Publications (2)

Publication Number Publication Date
EP1042072A1 true EP1042072A1 (en) 2000-10-11
EP1042072B1 EP1042072B1 (en) 2004-06-30

Family

ID=9515339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98959100A Expired - Lifetime EP1042072B1 (en) 1997-12-24 1998-12-22 Spray nozzle with static means for inhibiting outflow

Country Status (10)

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US (1) US6371389B1 (en)
EP (1) EP1042072B1 (en)
JP (1) JP2001526957A (en)
AT (1) ATE270153T1 (en)
AU (1) AU1501699A (en)
BR (1) BR9814352A (en)
CA (1) CA2315908A1 (en)
DE (1) DE69824890D1 (en)
FR (1) FR2772644B1 (en)
WO (1) WO1999033572A1 (en)

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Also Published As

Publication number Publication date
FR2772644A1 (en) 1999-06-25
ATE270153T1 (en) 2004-07-15
JP2001526957A (en) 2001-12-25
DE69824890D1 (en) 2004-08-05
EP1042072B1 (en) 2004-06-30
CA2315908A1 (en) 1999-07-08
WO1999033572A1 (en) 1999-07-08
BR9814352A (en) 2002-03-05
FR2772644B1 (en) 2000-02-04
US6371389B1 (en) 2002-04-16
AU1501699A (en) 1999-07-19

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