WO2001000329A1 - Spray nozzle with swirl chamber provided with a front end rear annular rib for outlet passage - Google Patents

Spray nozzle with swirl chamber provided with a front end rear annular rib for outlet passage Download PDF

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Publication number
WO2001000329A1
WO2001000329A1 PCT/IB2000/000817 IB0000817W WO0100329A1 WO 2001000329 A1 WO2001000329 A1 WO 2001000329A1 IB 0000817 W IB0000817 W IB 0000817W WO 0100329 A1 WO0100329 A1 WO 0100329A1
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WO
WIPO (PCT)
Prior art keywords
swirl chamber
annular rib
spray nozzle
central
nozzle according
Prior art date
Application number
PCT/IB2000/000817
Other languages
French (fr)
Inventor
Jean René BICKART
Pascal Meyer
Original Assignee
Verbena Corporation N.V.
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 Corporation N.V. filed Critical Verbena Corporation N.V.
Priority to AU50969/00A priority Critical patent/AU5096900A/en
Publication of WO2001000329A1 publication Critical patent/WO2001000329A1/en

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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

Definitions

  • the present invention relates to single-stage spray nozzles, as described for example in the document
  • CH 421 009 A in which the fluid to be sprayed is supplied by fluid inlet channels injecting the fluid in a vortex fashion into a central vortex chamber limited by a peripheral wall with a longitudinal axis, by a front wall with coaxial passage of exit and through a rear wall.
  • the fluid admission channel or channels pass directly through the peripheral wall and are shaped to inject the fluid into the swirl chamber in a direction substantially perpendicular to the longitudinal axis of the nozzle, or axis of the coaxial outlet passage.
  • Multistage spray nozzles are also known as described in document FR 2 399 282
  • A in which the fluid admission channels pass through the peripheral wall in at least two successive stages separated by at least one intermediate annular channel, constituting stages of turbulence.
  • a posterior frontal annular rib borders the entry of the coaxial exit passage, and is surrounded by the discontinuous zone of arrival of the fluid admission channels.
  • the coaxial outlet passage shown in the drawings is strongly conical.
  • the document teaches that the posterior frontal annular rib has the function of element generating turbulence.
  • Document WO 94 27729 A also describes a multistage spray nozzle in which the fluid intake channels pass through the peripheral wall in at least two successive stages separated by at least one intermediate annular channel, with reversal of the direction of rotation of the flux.
  • a posterior frontal annular rib also has the effect of generating turbulence to promote the liquid dispersion.
  • the shape of the coaxial outlet passage is not specified.
  • the turbulence generation means make it possible to control the size of the droplets at the outlet of the nozzle without having to excessively reduce the diameter of the coaxial outlet passage.
  • the coaxial outlet passage has a significantly reduced cross section compared to the cross section of the swirl chamber, and its size is chosen according to the flow rate of the nozzle. spraying and depending on the size of the droplets to be obtained at the outlet of the nozzle.
  • the diameter of the coaxial outlet passage constitutes the essential parameter for controlling the size of the droplets at the outlet of such single-stage nozzles.
  • a major problem with such known single-stage liquid spray nozzles is the risk of clogging of the nozzle when the diameter of the coaxial outlet passage is reduced to obtain a fine spray. This risk is further increased in the nozzles intended to spray liquids at a relatively low rate, since the channels of the nozzle must then have a reduced section.
  • a spray nozzle operates correctly if the flow rate is above a given minimum threshold.
  • the problem proposed by the invention is to reduce the minimum flow threshold of a spray chamber nozzle swirl and axial outlet channel without reducing the cross section of the outlet channel and thus without increasing the risk of clogging of the spray nozzle.
  • the invention aims to reduce the risk of clogging of the low-flow spray nozzles.
  • the invention can find application in various spraying systems for different types of liquids, and can be advantageous in particular for spraying products liable to cause clogging, for example lacquers.
  • the invention provides a spray nozzle having:
  • a central swirl chamber bounded by a peripheral wall of revolution with a longitudinal axis, by a front wall, and by a rear wall, - at least one fluid intake channel directly passing through the peripheral wall, open in the central chamber swirling and shaped to tangentially inject the fluid into the swirling chamber,
  • the spray nozzle comprises a plurality of intake channels regularly distributed around the periphery of the central swirl chamber.
  • the fluid inlet channels directly conduct the fluid inlet flow from anterior peripheral cavities to the central swirl chamber.
  • the central swirl chamber can advantageously be of generally cylindrical shape.
  • the posterior frontal annular rib is preferably limited by a circular inner edge with a sharp angle.
  • the posterior front annular rib has a rectangular section.
  • the rear frontal annular rib has an outside diameter smaller than the diameter of the central swirl chamber, leaving around it a free annular portion of the central swirl chamber.
  • an improvement in the effect sought by the invention is obtained by providing that the posterior frontal annular rib is of a height such that its upstream vertex remains set back downstream of the posterior zone of the central vortex chamber receiving the channels of admission of fluid, leaving between the posterior frontal annular rib and the posterior zone of the central vortex chamber a section of free chamber of sufficient height which favors the vortex.
  • 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 an enlarged view of the front area of Figure 1;
  • FIG. 3 is a rear view of the rear face of a front plate according to the embodiment of Figure 2;
  • FIG. 4 is a side view in longitudinal section along the plane A of the front plate.
  • FIG. 5 is a view on a larger scale of the central zone B of FIG. 4.
  • the spray nozzle generally illustrated in the figures comprises a hollow nozzle body 1, for example a cylindrical hollow body, bounded by a peripheral external wall 2 of longitudinal axis II and of revolution, and closed by a radial front external wall 3 provided with an axial outlet hole 4.
  • a posterior core 5 is fitted in the hollow body of nozzle 1, with channels 6 and 7 for supplying fluid to one or more anterior peripheral cavities 8, 8a and 8b.
  • the rear core 5 may be in one piece, or may be an assembly of several parts, for example an assembly of two parts 5a and 5b as illustrated in FIG. 2.
  • the front face 16 of the rear core 5 constitutes a first surface for guiding the liquid to be sprayed.
  • the liquid to be sprayed is also guided by the rear wall 13 of the front nozzle structure.
  • the front nozzle structure is formed on the one hand by the radial front external wall 3, and on the other hand by an attached front plate 15 engaged in abutment against the rear face of the radial anterior outer wall 3.
  • the rear face of the added front plate 15 includes grooves forming lateral fluid intake channels 14, 14a and 14b, directly leading the fluid inlet flow from the peripheral anterior cavities 8, 8a and 8b to the rear part of a central swirl chamber 9 itself produced in the front plate 15.
  • At least one channel such as channel 14 is provided, shaped to inject the fluid tangentially into the rear part of the central swirl chamber 9.
  • the central swirl chamber 9 is limited by a peripheral wall 10 of revolution with a longitudinal axis II, by a front wall 11 with coaxial outlet passage, and by a rear wall.
  • the rear wall is formed by the rear core 5, the peripheral 10 and front 11 walls being formed by the front plate 15.
  • the central swirl chamber 9 is generally cylindrical in shape with a longitudinal axis II and a diameter D2, and communicates with the front face of the nozzle by a coaxial outlet passage 12 passing through the front plate 15 attached.
  • the coaxial outlet passage 12 is coaxial with the central swirl chamber 9, and communicates with the central swirl chamber 9 through an inlet port 29. Its diameter D1 is smaller than that of the axial outlet hole 4 of the wall external anterior radial 3.
  • a rear front annular rib 30 borders the inlet orifice 29 of the coaxial outlet passage 12 in the central swirl chamber 9.
  • the coaxial outlet passage 12 is substantially cylindrical, that is to say - say with an angle of cone C with apex directed towards the outlet and of value between 0 ° (cylindrical hole) and a maximum of approximately 6 ° (frustoconical hole with very small angle).
  • the posterior front annular rib 30 is surrounded by a free annular anterior portion 33 of the swirl chamber which is limited externally by a continuous cylindrical peripheral wall 10a.
  • the flow rate can be reduced, and the particle size of the droplets at the outlet of the nozzle can be finer, without having to reduce the actual diameter of the coaxial outlet passage 12.
  • a cone angle C less than about 4 ° will preferably be chosen.
  • the internal diameter of the rear frontal annular rib 30 is equal to the diameter Dl of the inlet orifice 29 of the coaxial outlet passage 12. There is thus continuity between the inner surface of the posterior front annular rib 30 and the interior surface of the coaxial outlet passage 12.
  • posterior front annular rib 30 is limited by an inner edge 32 circular at a sharp angle, as illustrated in FIG. 5.
  • rear frontal annular rib 30 has a rectangular section.
  • the posterior frontal annular rib 30 has an outside diameter D3 which must remain smaller than the diameter D2 of the central swirl chamber 9.
  • a free annular anterior portion 33 of the chamber is provided around the posterior frontal annular rib 30 swirl center 9, externally limited by a continuous cylindrical peripheral wall 10a, and in which a fluid vortex is maintained.
  • the cross section of diameter D2 of the central swirl chamber 9 is occupied approximately for a third by the coaxial outlet passage 12, for a second third by the posterior front annular rib 30, and for a third third by the free annular portion 33.
  • the rear frontal annular rib 30 has a height H1 such that its upstream vertex remains set back downstream of the rear zone of the central swirl chamber 9 receiving the fluid intake channels 14, 14a, 14b.
  • a free cylindrical section 34 of height H2 there is provided between the posterior front annular rib 30 and the posterior zone of the central swirl chamber 9 a free cylindrical section 34 of height H2 in which the fluid can freely swirl around the axis II along the entire cross section of the chamber. swirl center 9.
  • the central swirl chamber 9 has a height H3, or dimension in the axial direction, which is greater than the sum of the height H4 of the posterior zone occupied by the outlet orifices of the fluid inlet channels 14, 14a and 14b and of the height H1 of the posterior front annular rib 30.
  • the invention can find application in the spraying of liquids more difficult to spray, for example of water-based mixtures, of lacquers.

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Abstract

The invention concerns a spray nozzle comprising a central swirl chamber (9) in the rear part whereof the fluid to be sprayed penetrates in a vortex through fluid intake channels (14). The fluid exits the central swirl chamber (9) through a cylindrical or slightly conical coaxial outlet passage (12) converging towards the outlet, and whereof the inlet orifice (29) is flanged with a rear front end annular rib (30) itself enclosed by a free annular front portion (33) of the swirl chamber, thereby reducing the minimum flow rate of the nozzle, and the size of the sprayed fluid droplets.

Description

BUSE DE PULVERISATION SPRAY NOZZLE
A CHAMBRE DE TOURBILLONNEMENT MUNIEWITH PROVIDED SWIRL CHAMBER
D'UNE NERVURE ANNULAIRE FRONTALE POSTERIEUREOF A POSTERIOR FRONTAL ANNULAR RIB
DE PASSAGE DE SORTIEOUTPUT PASS
DOMAINE TECHNIQUE DE L'INVENTIONTECHNICAL FIELD OF THE INVENTION
La présente invention concerne les buses de pulvérisation à un seul étage, telles que décrites par exemple dans le documentThe present invention relates to single-stage spray nozzles, as described for example in the document
CH 421 009 A, dans lesquelles le fluide à pulvériser est amené par des canaux d'admission de fluide injectant le fluide de façon tourbillonnaire dans une chambre centrale de tourbillonnement limitée par une paroi périphérique à axe longitudinal, par une paroi antérieure à passage coaxial de sortie et par une paroi postérieure. Le ou les canaux d'admission de fluide traversent directement la paroi périphérique et sont conformés pour injecter le fluide dans la chambre de tourbillonnement selon une direction sensiblement perpendiculaire à l'axe longitudinal de la buse, ou axe du passage coaxial de sortie.CH 421 009 A, in which the fluid to be sprayed is supplied by fluid inlet channels injecting the fluid in a vortex fashion into a central vortex chamber limited by a peripheral wall with a longitudinal axis, by a front wall with coaxial passage of exit and through a rear wall. The fluid admission channel or channels pass directly through the peripheral wall and are shaped to inject the fluid into the swirl chamber in a direction substantially perpendicular to the longitudinal axis of the nozzle, or axis of the coaxial outlet passage.
On connaît également des buses de pulvérisation à plusieurs étages telles que décrites dans le document FR 2 399 282Multistage spray nozzles are also known as described in document FR 2 399 282
A, dans lesquelles les canaux d'admission de fluide traversent la paroi périphérique en au moins deux étapes successives séparées par au moins un canal annulaire intermédiaire, constituant des étages de turbulence. Une nervure annulaire frontale postérieure borde l'entrée du passage coaxial de sortie, et est entourée par la zone discontinue d'arrivée des canaux d'admission de fluide. Le passage coaxial de sortie représenté sur les dessins est fortement conique.A, in which the fluid admission channels pass through the peripheral wall in at least two successive stages separated by at least one intermediate annular channel, constituting stages of turbulence. A posterior frontal annular rib borders the entry of the coaxial exit passage, and is surrounded by the discontinuous zone of arrival of the fluid admission channels. The coaxial outlet passage shown in the drawings is strongly conical.
Le document enseigne que la nervure annulaire frontale postérieure a la fonction d'élément générateur de turbulence. Le document WO 94 27729 A décrit également une buse de pulvérisation à plusieurs étages dans laquelle les canaux d'admission de fluide traversent la paroi périphérique en au moins deux étapes successives séparées par au moins un canal annulaire intermédiaire, avec inversion du sens de rotation du flux. Dans cette structure de buse, une nervure annulaire frontale postérieure a également pour effet de générer des turbulences pour favoriser la dispersion du liquide. La forme du passage coaxial de sortie n'est pas précisée.The document teaches that the posterior frontal annular rib has the function of element generating turbulence. Document WO 94 27729 A also describes a multistage spray nozzle in which the fluid intake channels pass through the peripheral wall in at least two successive stages separated by at least one intermediate annular channel, with reversal of the direction of rotation of the flux. In this nozzle structure, a posterior frontal annular rib also has the effect of generating turbulence to promote the liquid dispersion. The shape of the coaxial outlet passage is not specified.
Dans les buses connues à plusieurs étages, les moyens de génération de turbulence permettent de maîtriser la taille des gouttelettes en sortie de buse sans avoir à réduire exagérément le diamètre du passage coaxial de sortie.In known nozzles with several stages, the turbulence generation means make it possible to control the size of the droplets at the outlet of the nozzle without having to excessively reduce the diameter of the coaxial outlet passage.
Par contre, dans les buses de pulvérisation connues à un seul étage, le passage coaxial de sortie présente une section transversale nettement réduite par rapport à la section transversale de la chambre de tourbillonnement, et sa dimension est choisie en fonction du débit de la buse de pulvérisation et en fonction de la taille des gouttelettes à obtenir en sortie de la buse. Ainsi, le diamètre du passage coaxial de sortie constitue le paramètre essentiel pour maîtriser la taille des gouttelettes en sortie de telles buses à un seul étage.In contrast, in known single-stage spray nozzles, the coaxial outlet passage has a significantly reduced cross section compared to the cross section of the swirl chamber, and its size is chosen according to the flow rate of the nozzle. spraying and depending on the size of the droplets to be obtained at the outlet of the nozzle. Thus, the diameter of the coaxial outlet passage constitutes the essential parameter for controlling the size of the droplets at the outlet of such single-stage nozzles.
Un problème important de telles buses connues de pulvérisation de liquide à un seul étage est le risque de bouchage de la buse lorsqu'on réduit le diamètre du passage coaxial de sortie pour obtenir une pulvérisation fine. Ce risque est encore augmenté dans les buses destinées à pulvériser des liquides selon un débit relativement faible, car les canaux de la buse doivent alors avoir une section réduite.A major problem with such known single-stage liquid spray nozzles is the risk of clogging of the nozzle when the diameter of the coaxial outlet passage is reduced to obtain a fine spray. This risk is further increased in the nozzles intended to spray liquids at a relatively low rate, since the channels of the nozzle must then have a reduced section.
A défaut de réduire la section des canaux, en particulier la section du passage coaxial de sortie de buse en aval d'une chambre de tourbillonnement, la pulvérisation est défectueuse et les tailles de gouttelettes sont trop grandes.Failing to reduce the section of the channels, in particular the section of the coaxial nozzle outlet passage downstream of a swirl chamber, the spraying is defective and the droplet sizes are too large.
Ainsi, pour une taille de canaux donnée, en particulier pour une taille donnée de passage coaxial de sortie, une buse de pulvérisation fonctionne correctement si le débit est supérieur à un seuil minimal donné .Thus, for a given size of channels, in particular for a given size of coaxial outlet passage, a spray nozzle operates correctly if the flow rate is above a given minimum threshold.
Autrement dit, plus le seuil minimal désiré de débit est faible, plus les canaux doivent être petits, et plus les risques de bouchage sont grands. Egalement, leur réalisation est plus difficile et onéreuse. EXPOSE DE L'INVENTIONIn other words, the lower the desired minimum flow threshold, the smaller the channels, and the greater the risk of clogging. Also, their realization is more difficult and expensive. STATEMENT OF THE INVENTION
Le problème proposé par l'invention est de réduire le seuil de débit minimal d'une buse de pulvérisation à chambre de tourbillonnement et canal axial de sortie sans réduire la section transversale du canal de sortie et ainsi sans augmenter les risques de bouchage de la buse de pulvérisation.The problem proposed by the invention is to reduce the minimum flow threshold of a spray chamber nozzle swirl and axial outlet channel without reducing the cross section of the outlet channel and thus without increasing the risk of clogging of the spray nozzle.
De façon similaire, l'invention vise à diminuer les risques de bouchage des buses de pulvérisation à faible débit.Similarly, the invention aims to reduce the risk of clogging of the low-flow spray nozzles.
Ainsi, l'invention peut trouver application dans divers systèmes de pulvérisation pour différents types de liquides, et peut être avantageuse notamment pour la pulvérisation de produits susceptibles de provoquer un bouchage, par exemple les laques. Pour atteindre ces objets ainsi que d'autres, l'invention prévoit une buse de pulvérisation ayant :Thus, the invention can find application in various spraying systems for different types of liquids, and can be advantageous in particular for spraying products liable to cause clogging, for example lacquers. To achieve these and other objects, 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, et par une paroi postérieure, - au moins un canal d'admission de fluide traversant directement la paroi périphérique, ouvert dans la chambre centrale de tourbillonnement et conformé pour injecter tangentiellement le fluide dans la chambre de tourbillonnement,- a central swirl chamber, bounded by a peripheral wall of revolution with a longitudinal axis, by a front wall, and by a rear wall, - at least one fluid intake channel directly passing through the peripheral wall, open in the central chamber swirling and shaped to tangentially inject the fluid into the swirling chamber,
- un passage coaxial de sortie, traversant la paroi antérieure et en forme de tronçon de cône dont 1 ' angle au sommet est compris entre 0° et 6° environ et converge vers la sortie,- a coaxial outlet passage, passing through the front wall and in the form of a cone section, the apex angle of which is between approximately 0 ° and 6 ° and converges towards the outlet,
- une nervure annulaire frontale postérieure, bordant l'orifice d'entrée du passage coaxial de sortie dans la chambre centrale de tourbillonnement, - entourant la nervure annulaire frontale postérieure, une portion antérieure annulaire libre de chambre centrale de tourbillonnement, limitée par une paroi périphérique cylindrique continue.- a rear frontal annular rib, bordering the entry orifice of the coaxial outlet passage in the central swirl chamber, - surrounding the rear frontal annular rib, a free annular anterior portion of central swirl chamber, bounded by a peripheral wall cylindrical continuous.
De préférence, la buse de pulvérisation comprend une pluralité de canaux d'admission régulièrement répartis en périphérie de la chambre centrale de tourbillonnement.Preferably, the spray nozzle comprises a plurality of intake channels regularly distributed around the periphery of the central swirl chamber.
Selon un mode de réalisation avantageux, les canaux d'admission de fluide conduisent directement le flux d'entrée de fluide depuis des cavités antérieures périphériques jusqu'à la chambre centrale de tourbillonnement. La chambre centrale de tourbillonnement peut avantageusement être de forme générale cylindrique. La nervure annulaire frontale postérieure est de préférence limitée par une arête intérieure circulaire à angle vif. Selon une première réalisation, la nervure annulaire frontale postérieure présente une section rectangulaire. En alternative, on peut prévoir que la nervure annulaire frontale postérieure présente une section triangulaire avec une face postérieure orientée radialement vers l'extérieur.According to an advantageous embodiment, the fluid inlet channels directly conduct the fluid inlet flow from anterior peripheral cavities to the central swirl chamber. The central swirl chamber can advantageously be of generally cylindrical shape. The posterior frontal annular rib is preferably limited by a circular inner edge with a sharp angle. According to a first embodiment, the posterior front annular rib has a rectangular section. Alternatively, provision may be made for the rear frontal annular rib to have a triangular section with a rear face oriented radially outwards.
De préférence, la nervure annulaire frontale postérieure présente un diamètre extérieur plus petit que le diamètre de la chambre centrale de tourbillonnement, laissant autour d'elle une portion annulaire libre de chambre centrale de tourbillonnement.Preferably, the rear frontal annular rib has an outside diameter smaller than the diameter of the central swirl chamber, leaving around it a free annular portion of the central swirl chamber.
Egalement, une amélioration de l'effet recherché par 1 ' invention est obtenue en prévoyant que la nervure annulaire frontale postérieure est de hauteur telle que son sommet amont reste en retrait en aval de la zone postérieure de chambre centrale de tourbillonnement recevant les canaux d'admission de fluide, laissant entre la nervure annulaire frontale postérieure et la zone postérieure de chambre centrale de tourbillonnement un tronçon de chambre libre de hauteur suffisante qui favorise le tourbillonnement.Also, an improvement in the effect sought by the invention is obtained by providing that the posterior frontal annular rib is of a height such that its upstream vertex remains set back downstream of the posterior zone of the central vortex chamber receiving the channels of admission of fluid, leaving between the posterior frontal annular rib and the posterior zone of the central vortex chamber a section of free chamber of sufficient height which favors the vortex.
DESCRIPTION SOMMAIRE DES DESSINS Un mode de réalisation avantageux de 1 ' invention est décrit ci-après en relation avec les figures 1 à 5, dans lesquelles : - 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 ;SUMMARY DESCRIPTION OF THE DRAWINGS An advantageous embodiment of the invention is described below in relation to FIGS. 1 to 5, in which: FIG. 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 vue à plus grande échelle de la zone antérieure de la figure 1 ; - la figure 3 est une vue d'arrière de la face postérieure d'une plaquette antérieure selon le mode de réalisation de la figure 2 ;- Figure 2 is an enlarged view of the front area of Figure 1; - Figure 3 is a rear view of the rear face of a front plate according to the embodiment of Figure 2;
- la figure 4 est une vue de côté en coupe longitudinale selon le plan A de la plaquette antérieure ; et- Figure 4 is a side view in longitudinal section along the plane A of the front plate; and
- la figure 5 est une vue à plus grande échelle de la zone centrale B de la figure 4.FIG. 5 is a view on a larger scale of the central zone B of FIG. 4.
DESCRIPTION DES MODES DE REALISATION PREFERES La buse de pulvérisation généralement illustrée sur les figures comprend un corps creux de buse 1, par exemple un corps à creux cylindrique, limité par une paroi externe périphérique 2 d'axe longitudinal I-I et de révolution, et fermé par une paroi externe antérieure radiale 3 munie d'un trou axial de sortie 4.DESCRIPTION OF THE PREFERRED EMBODIMENTS The spray nozzle generally illustrated in the figures comprises a hollow nozzle body 1, for example a cylindrical hollow body, bounded by a peripheral external wall 2 of longitudinal axis II and of revolution, and closed by a radial front external wall 3 provided with an axial outlet hole 4.
Un noyau postérieur 5 est adapté dans le corps creux de buse 1, avec des canaux 6 et 7 d'amenée de fluide jusqu'à une ou plusieurs cavités antérieures périphériques 8, 8a et 8b.A posterior core 5 is fitted in the hollow body of nozzle 1, with channels 6 and 7 for supplying fluid to one or more anterior peripheral cavities 8, 8a and 8b.
Le noyau postérieur 5 peut être d'une seule pièce, ou peut être un assemblage de plusieurs pièces, par exemple un assemblage de deux pièces 5a et 5b comme illustré sur la figure 2. La face antérieure 16 du noyau postérieur 5 constitue une première surface de guidage du liquide à pulvériser.The rear core 5 may be in one piece, or may be an assembly of several parts, for example an assembly of two parts 5a and 5b as illustrated in FIG. 2. The front face 16 of the rear core 5 constitutes a first surface for guiding the liquid to be sprayed.
Le liquide à pulvériser est également guidé par la paroi postérieure 13 de la structure antérieure de buse. Dans le mode de réalisation illustré sur la figure 2, la structure antérieure de buse est constituée d'une part par la paroi externe antérieure radiale 3, et d'autre part par une plaquette antérieure 15 rapportée engagée en appui contre la face postérieure de la paroi externe antérieure radiale 3.The liquid to be sprayed is also guided by the rear wall 13 of the front nozzle structure. In the embodiment illustrated in FIG. 2, the front nozzle structure is formed on the one hand by the radial front external wall 3, and on the other hand by an attached front plate 15 engaged in abutment against the rear face of the radial anterior outer wall 3.
La face postérieure de la plaquette antérieure 15 rapportée comprend des rainures formant des canaux latéraux d'admission de fluide 14, 14a et 14b, conduisant directement le flux d'entrée de fluide depuis les cavités antérieures périphériques 8, 8a et 8b jusqu'à la partie postérieure d'une chambre centrale de tourbillonnement 9 elle-même réalisée dans la plaquette antérieure 15. On prévoit au moins un canal tel que le canal 14, conformé pour injecter le fluide tangentiellement dans la partie postérieure de la chambre centrale de tourbillonnement 9. La chambre centrale de tourbillonnement 9 est limitée par une paroi périphérique 10 de révolution à axe longitudinal I-I, par une paroi antérieure 11 à passage coaxial de sortie, et par une paroi postérieure. La paroi postérieure est constituée par le noyau postérieur 5, les parois périphérique 10 et antérieure 11 étant constituées par la plaquette antérieure 15.The rear face of the added front plate 15 includes grooves forming lateral fluid intake channels 14, 14a and 14b, directly leading the fluid inlet flow from the peripheral anterior cavities 8, 8a and 8b to the rear part of a central swirl chamber 9 itself produced in the front plate 15. At least one channel such as channel 14 is provided, shaped to inject the fluid tangentially into the rear part of the central swirl chamber 9. The central swirl chamber 9 is limited by a peripheral wall 10 of revolution with a longitudinal axis II, by a front wall 11 with coaxial outlet passage, and by a rear wall. The rear wall is formed by the rear core 5, the peripheral 10 and front 11 walls being formed by the front plate 15.
La chambre centrale de tourbillonnement 9 est de forme généralement cylindrique d'axe longitudinal I-I et de diamètre D2, et communique avec la face avant de la buse par un passage coaxial de sortie 12 traversant la plaquette antérieure 15 rapportée. Le passage coaxial de sortie 12 est coaxial avec la chambre centrale de tourbillonnement 9, et communique avec la chambre centrale de tourbillonnement 9 par un orifice d'entrée 29. Son diamètre Dl est plus petit que celui du trou axial de sortie 4 de la paroi externe antérieure radiale 3.The central swirl chamber 9 is generally cylindrical in shape with a longitudinal axis II and a diameter D2, and communicates with the front face of the nozzle by a coaxial outlet passage 12 passing through the front plate 15 attached. The coaxial outlet passage 12 is coaxial with the central swirl chamber 9, and communicates with the central swirl chamber 9 through an inlet port 29. Its diameter D1 is smaller than that of the axial outlet hole 4 of the wall external anterior radial 3.
Selon l'invention, une nervure annulaire frontale postérieure 30 borde l'orifice d'entrée 29 du passage coaxial de sortie 12 dans la chambre centrale de tourbillonnement 9. Simultanément, le passage coaxial de sortie 12 est sensiblement cylindrique, c'est-à-dire avec un angle de cône C à sommet dirigé vers la sortie et de valeur comprise entre 0° (trou cylindrique) et un maximum de 6° environ (trou tronconique à angle très faible) . Egalement, la nervure annulaire frontale postérieure 30 est entourée par une portion antérieure annulaire libre 33 de chambre de tourbillonnement qui est limitée extérieurement par une paroi périphérique cylindrique 10a continue.According to the invention, a rear front annular rib 30 borders the inlet orifice 29 of the coaxial outlet passage 12 in the central swirl chamber 9. Simultaneously, the coaxial outlet passage 12 is substantially cylindrical, that is to say - say with an angle of cone C with apex directed towards the outlet and of value between 0 ° (cylindrical hole) and a maximum of approximately 6 ° (frustoconical hole with very small angle). Also, the posterior front annular rib 30 is surrounded by a free annular anterior portion 33 of the swirl chamber which is limited externally by a continuous cylindrical peripheral wall 10a.
Dans une telle buse, la combinaison de ces caractéristiques fait apparaître et accentue la présence d'une veine gazeuse annulaire pariétale 31 au bord intérieur de l'orifice d'entrée 29 dans le passage coaxial de sortie 12. Cette veine gazeuse annulaire pariétale 31 réduit le diamètre hydraulique utile du passage coaxial de sortie 12, provoquant ainsi la réduction du débit de fluide à pulvériser, et permettant de réaliser une granulométrie plus fine de la pulvérisation de liquide en sortie de la buse. Des essais ont permis de réduire le débit de la buse de pulvérisation dans un rapport de l'ordre de 30 %.In such a nozzle, the combination of these characteristics reveals and accentuates the presence of a parietal annular gas stream 31 at the inner edge of the inlet orifice 29 in the coaxial outlet passage 12. This parietal annular gas stream 31 reduces the useful hydraulic diameter of the coaxial outlet passage 12, thus causing the reduction in the flow rate of fluid to be sprayed, and making it possible to achieve a finer particle size distribution of the liquid spray at the outlet of the nozzle. Tests have made it possible to reduce the flow rate of the spray nozzle by a ratio of the order of 30%.
Ainsi, le débit peut être réduit, et la granulométrie des gouttelettes en sortie de buse peut être plus fine, sans avoir à réduire le diamètre réel du passage coaxial de sortie 12.Thus, the flow rate can be reduced, and the particle size of the droplets at the outlet of the nozzle can be finer, without having to reduce the actual diameter of the coaxial outlet passage 12.
En pratique, on choisira de préférence un angle de cône C inférieur à 4° environ.In practice, a cone angle C less than about 4 ° will preferably be chosen.
Dans le mode de réalisation illustré sur les figures, le diamètre intérieur de la nervure annulaire frontale postérieure 30 est égal au diamètre Dl de l'orifice d'entrée 29 du passage coaxial de sortie 12. Il y a ainsi continuité entre la surface intérieure de la nervure annulaire frontale postérieure 30 et la surface intérieure du passage coaxial de sortie 12.In the embodiment illustrated in the figures, the internal diameter of the rear frontal annular rib 30 is equal to the diameter Dl of the inlet orifice 29 of the coaxial outlet passage 12. There is thus continuity between the inner surface of the posterior front annular rib 30 and the interior surface of the coaxial outlet passage 12.
Egalement, la nervure annulaire frontale postérieure 30 est limitée par une arête intérieure 32 circulaire à angle vif, comme illustré sur la figure 5.Also, the posterior front annular rib 30 is limited by an inner edge 32 circular at a sharp angle, as illustrated in FIG. 5.
Sur cette même figure, on voit que la nervure annulaire frontale postérieure 30 présente une section rectangulaire.In this same figure, it can be seen that the rear frontal annular rib 30 has a rectangular section.
En alternative, on pourrait prévoir une nervure annulaire frontale postérieure 30 présentant une section triangulaire, avec une face postérieure orientée radialement vers l'extérieur.Alternatively, one could provide a posterior front annular rib 30 having a triangular section, with a rear face oriented radially outwards.
La nervure annulaire frontale postérieure 30 présente un diamètre extérieur D3 qui doit rester inférieur au diamètre D2 de la chambre centrale de tourbillonnement 9. De la sorte, on prévoit, autour de la nervure annulaire frontale postérieure 30, une portion antérieure annulaire libre 33 de chambre centrale de tourbillonnement 9, limitée extérieurement par une paroi périphérique cylindrique continue 10a, et dans laquelle est entretenu un tourbillon de fluide. Par exemple, comme illustré sur la figure 5, la section transversale de diamètre D2 de la chambre centrale de tourbillonnement 9 est occupée environ pour un tiers par le passage coaxial de sortie 12, pour un second tiers par la nervure annulaire frontale postérieure 30, et pour un troisième tiers par la portion annulaire libre 33.The posterior frontal annular rib 30 has an outside diameter D3 which must remain smaller than the diameter D2 of the central swirl chamber 9. In this way, a free annular anterior portion 33 of the chamber is provided around the posterior frontal annular rib 30 swirl center 9, externally limited by a continuous cylindrical peripheral wall 10a, and in which a fluid vortex is maintained. For example, as illustrated in FIG. 5, the cross section of diameter D2 of the central swirl chamber 9 is occupied approximately for a third by the coaxial outlet passage 12, for a second third by the posterior front annular rib 30, and for a third third by the free annular portion 33.
De préférence, la nervure annulaire frontale postérieure 30 présente une hauteur Hl telle que son sommet amont reste en retrait en aval de la zone postérieure de chambre centrale de tourbillonnement 9 recevant les canaux d'admission de fluide 14, 14a, 14b. Ainsi, on prévoit entre la nervure annulaire frontale postérieure 30 et la zone postérieure de chambre centrale de tourbillonnement 9 un tronçon cylindrique libre 34 de hauteur H2 dans lequel le fluide peut librement tourbillonner autour de l'axe I-I selon toute la section transversale de la chambre centrale de tourbillonnement 9.Preferably, the rear frontal annular rib 30 has a height H1 such that its upstream vertex remains set back downstream of the rear zone of the central swirl chamber 9 receiving the fluid intake channels 14, 14a, 14b. Thus, there is provided between the posterior front annular rib 30 and the posterior zone of the central swirl chamber 9 a free cylindrical section 34 of height H2 in which the fluid can freely swirl around the axis II along the entire cross section of the chamber. swirl center 9.
En d'autres termes, dans ce mode de réalisation avantageux, la chambre centrale de tourbillonnement 9 présente une hauteur H3, ou dimension dans le sens axial, qui est supérieure à la somme de la hauteur H4 de zone postérieure occupée par les orifices de sortie des canaux d'admission de fluide 14, 14a et 14b et de la hauteur Hl de la nervure annulaire frontale postérieure 30.In other words, in this advantageous embodiment, the central swirl chamber 9 has a height H3, or dimension in the axial direction, which is greater than the sum of the height H4 of the posterior zone occupied by the outlet orifices of the fluid inlet channels 14, 14a and 14b and of the height H1 of the posterior front annular rib 30.
Par exemple, de bons résultats sont obtenus en prévoyant des hauteurs Hl et H2 sensiblement égales l'une à l'autre.For example, good results are obtained by providing heights H1 and H2 substantially equal to each other.
L'invention peut trouver application dans la pulvérisation de liquides plus difficiles à pulvériser, par exemple de mélanges à base d'eau, de laques.The invention can find application in the spraying of liquids more difficult to spray, for example of water-based mixtures, of lacquers.
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 :CLAIMS 1 - Spray nozzle having:
- une chambre centrale de tourbillonnement (9) limitée par une paroi périphérique (10) de révolution à axe longitudinal (I-I), par une paroi antérieure (11), et par une paroi postérieure (5), au moins un canal d'admission de fluide (14) traversant directement la paroi périphérique (10), ouvert dans la chambre centrale de tourbillonnement (9) et conformé pour injecter tangentiellement le fluide dans la chambre de tourbillonnement (9), - un passage coaxial de sortie (12), traversant la paroi antérieure (11) et en forme de tronçon de cône dont l'angle au sommet (C) est compris entre 0e et 6° environ et converge vers la sortie, une nervure annulaire frontale postérieure (30), bordant l'orifice d'entrée (29) du passage coaxial de sortie (12) dans la chambre centrale de tourbillonnement (9),- a central swirl chamber (9) limited by a peripheral wall (10) of revolution with a longitudinal axis (II), by a front wall (11), and by a rear wall (5), at least one inlet channel fluid (14) passing directly through the peripheral wall (10), open in the central swirl chamber (9) and shaped to tangentially inject the fluid into the swirl chamber (9), - a coaxial outlet passage (12), crossing the anterior wall (11) and in the form of a cone section whose apex angle (C) is between approximately 0 e and 6 ° and converges towards the outlet, a posterior frontal annular rib (30), bordering the inlet orifice (29) of the coaxial outlet passage (12) in the central swirl chamber (9),
- entourant la nervure annulaire frontale postérieure (30) , une portion antérieure annulaire libre (33) de chambre centrale de tourbillonnement, limitée par une paroi périphérique cylindrique (10a) continue. 2 - Buse de pulvérisation selon la revendication 1, caractérisée en ce qu'elle comprend une pluralité de canaux d'admission (14, 14a, 14b) régulièrement répartis en périphérie de la chambre centrale de tourbillonnement (9) .- surrounding the posterior frontal annular rib (30), a free annular anterior portion (33) of the central swirl chamber, bounded by a continuous cylindrical peripheral wall (10a). 2 - Spray nozzle according to claim 1, characterized in that it comprises a plurality of intake channels (14, 14a, 14b) regularly distributed around the periphery of the central swirl chamber (9).
3 - Buse de pulvérisation selon l'une des revendications 1 ou 2 caractérisée en ce que le ou les canaux d'admission de fluide3 - Spray nozzle according to one of claims 1 or 2 characterized in that the fluid intake channel (s)
(14, 14a, 14b) conduisent directement le flux d'entrée de fluide depuis des cavités antérieures périphériques (8, 8a, 8b) jusqu'à la chambre centrale de tourbillonnement (9) .(14, 14a, 14b) directly direct the fluid inlet flow from peripheral anterior cavities (8, 8a, 8b) to the central swirl chamber (9).
4 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la chambre centrale de tourbillonnement (9) est de forme générale cylindrique.4 - Spray nozzle according to any one of claims 1 to 3, characterized in that the central swirl chamber (9) is of generally cylindrical shape.
5 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le diamètre intérieur de la nervure annulaire frontale postérieure (30) est égal au diamètre (Dl) de l'orifice d'entrée (29) du passage coaxial de sortie (12) . 6 - Buse de pulvérisation selon la revendication 5 caractérisée en ce que la nervure annulaire frontale postérieure (30) est limitée par une arête intérieure (32) circulaire à angle vif. 7 - Buse de pulvérisation selon la revendication 6 caractérisée en ce que la nervure annulaire frontale postérieure (30) présente une section rectangulaire.5 - Spray nozzle according to any one of claims 1 to 4, characterized in that the internal diameter of the rear frontal annular rib (30) is equal to the diameter (Dl) of the inlet orifice (29) of the coaxial outlet passage (12). 6 - Spray nozzle according to claim 5 characterized in that the rear frontal annular rib (30) is limited by an inner edge (32) circular at a sharp angle. 7 - Spray nozzle according to claim 6 characterized in that the rear frontal annular rib (30) has a rectangular section.
8 - Buse de pulvérisation selon la revendication 6 caractérisée en ce que la nervure annulaire frontale postérieure (30) présente une section triangulaire avec une face postérieure orientée radialement vers l'extérieur.8 - Spray nozzle according to claim 6 characterized in that the rear frontal annular rib (30) has a triangular section with a rear face oriented radially outwards.
9 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 8 caractérisée en ce que la nervure annulaire frontale postérieure (30) présente un diamètre extérieur (D3) plus petit que le diamètre (D2) de la chambre centrale de tourbillonnement (9) , laissant autour d'elle ladite portion annulaire libre (33) de chambre centrale de tourbillonnement (9) .9 - Spray nozzle according to any one of claims 1 to 8 characterized in that the rear frontal annular rib (30) has an outside diameter (D3) smaller than the diameter (D2) of the central swirl chamber (9 ), leaving around it said free annular portion (33) of the central swirl chamber (9).
10 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 9 caractérisée en ce que la nervure annulaire frontale postérieure (30) présente une hauteur (Hl) telle que son sommet amont reste en retrait en aval de la zone postérieure de chambre centrale de tourbillonnement (9) recevant les canaux d'admission de fluide (14, 14a, 14b), laissant entre la nervure annulaire frontale postérieure (30) et la zone postérieure de chambre centrale de tourbillonnement (9) un tronçon cylindrique libre (34) de hauteur (H2) favorisant le tourbillonnement. 10 - Spray nozzle according to any one of claims 1 to 9 characterized in that the rear frontal annular rib (30) has a height (Hl) such that its upstream top remains recessed downstream of the posterior zone of the central chamber of swirl (9) receiving the fluid intake channels (14, 14a, 14b), leaving between the posterior frontal annular rib (30) and the posterior zone of central swirl chamber (9) a free cylindrical section (34) height (H2) promoting swirling.
PCT/IB2000/000817 1999-06-24 2000-06-21 Spray nozzle with swirl chamber provided with a front end rear annular rib for outlet passage WO2001000329A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU50969/00A AU5096900A (en) 1999-06-24 2000-06-21 Spray nozzle with swirl chamber provided with a front end rear annular rib for outlet passage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9908272A FR2795346B1 (en) 1999-06-24 1999-06-24 SPRAY NOZZLE WITH SWIRL CHAMBER PROVIDED WITH A FRONTAL ANNULAR RIB POSTERIOR EXIT PASSAGE
FR99/08272 1999-06-24

Publications (1)

Publication Number Publication Date
WO2001000329A1 true WO2001000329A1 (en) 2001-01-04

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PCT/IB2000/000817 WO2001000329A1 (en) 1999-06-24 2000-06-21 Spray nozzle with swirl chamber provided with a front end rear annular rib for outlet passage

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AU (1) AU5096900A (en)
FR (1) FR2795346B1 (en)
WO (1) WO2001000329A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB144348A (en) * 1919-08-08 1920-06-17 Robert Best Helliwell Improvements in spray jets
US4011992A (en) * 1975-07-23 1977-03-15 Par-Way Mfg. Co. System for heat conditioning of non-stick liquid preparation for spraying on grill
FR2399282A1 (en) * 1977-08-02 1979-03-02 Werding Winfried NOZZLE, DEVICES INCLUDING SUCH A NOZZLE AND PRODUCTION METHODS
US4273290A (en) * 1977-11-14 1981-06-16 The Afa Corporation Unitary valve and spring assembly
WO1994027729A1 (en) * 1993-05-25 1994-12-08 Winfried Werding Spraying nozzle for regulating a rate of flow per unit of time

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB144348A (en) * 1919-08-08 1920-06-17 Robert Best Helliwell Improvements in spray jets
US4011992A (en) * 1975-07-23 1977-03-15 Par-Way Mfg. Co. System for heat conditioning of non-stick liquid preparation for spraying on grill
FR2399282A1 (en) * 1977-08-02 1979-03-02 Werding Winfried NOZZLE, DEVICES INCLUDING SUCH A NOZZLE AND PRODUCTION METHODS
US4273290A (en) * 1977-11-14 1981-06-16 The Afa Corporation Unitary valve and spring assembly
WO1994027729A1 (en) * 1993-05-25 1994-12-08 Winfried Werding Spraying nozzle for regulating a rate of flow per unit of time

Also Published As

Publication number Publication date
FR2795346B1 (en) 2001-09-14
AU5096900A (en) 2001-01-31
FR2795346A1 (en) 2000-12-29

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