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EP1365864A1 - Spray nozzle with profiled channels - Google Patents

Spray nozzle with profiled channels

Info

Publication number
EP1365864A1
EP1365864A1 EP02701496A EP02701496A EP1365864A1 EP 1365864 A1 EP1365864 A1 EP 1365864A1 EP 02701496 A EP02701496 A EP 02701496A EP 02701496 A EP02701496 A EP 02701496A EP 1365864 A1 EP1365864 A1 EP 1365864A1
Authority
EP
European Patent Office
Prior art keywords
spray nozzle
swirl chamber
liquid
coaxial
channel
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
EP02701496A
Other languages
German (de)
French (fr)
Other versions
EP1365864B1 (en
Inventor
Jean René BICKART
Pascal Meyer
Jean-Pierre Songbe
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 EP1365864A1 publication Critical patent/EP1365864A1/en
Application granted granted Critical
Publication of EP1365864B1 publication Critical patent/EP1365864B1/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

Definitions

  • the present invention relates to liquid spray nozzles, in which a liquid to be sprayed is brought into a central swirl chamber by peripheral transfer channels tangentially injecting the liquid which swirls into the central swirl chamber and then leaves the central swirl chamber by a coaxial outlet passage to the atmosphere.
  • Such spray nozzles may be used in sprayers, in combination with spray pumps with manual actuation or with a pusher gas, in particular for spraying cosmetic products.
  • spray nozzles described in particular in document EP 0 000 688 A, comprising a swirl chamber having a general shape of revolution around a longitudinal axis, limited by a peripheral wall, by a rear wall, and by a front wall pierced with a coaxial outlet hole.
  • a coaxial circular channel surrounds the swirl chamber, and communicates with said swirl chamber through a plurality of first oblique peripheral transfer channels which inject the rotating liquid in a direction of rotation into the swirl chamber.
  • a plurality of second transfer channels conduct the liquid from a liquid inlet and inject it into the coaxial circular channel in rotation in said direction of rotation.
  • the first transfer channels are each limited by an outer face with a straight profile which tangentially connects to the peripheral wall of the swirl chamber, and which angularly connects to the inner wall of the coaxial circular channel.
  • Said first transfer channels are each limited by an inner face with a rectilinear profile and which is angularly connected to the peripheral wall of the swirl chamber and which is angularly connected to the internal wall of the coaxial circular channel.
  • the cross section of the first transfer channels is reduced gradually from the coaxial circular channel to the swirl chamber.
  • Such spray nozzles work well for spraying low viscosity liquids such as water, producing droplets of satisfactory size, on the order of 90 microns.
  • the problem proposed by the present invention is to reduce the size of the droplets sprayed at the outlet of a nozzle supplied with medium viscosity liquid or supplied with gel.
  • a spray nozzle according to the invention for spraying liquids, comprises:
  • a swirl chamber having a general shape of revolution around a longitudinal axis, limited by a peripheral wall, by a rear wall, and by a front wall pierced with a coaxial outlet hole, at least one coaxial circular channel arranged around the swirl chamber and communicating with said swirl chamber by a plurality of first oblique transfer channels injecting the liquid in rotation in a direction of rotation into the swirl chamber,
  • the first transfer channels are each limited by an outer face with a generally rectilinear profile and tangentially connecting to the peripheral wall of the swirl chamber,
  • the first transfer channels are each limited by an inner face having a concave profile over most of its length.
  • the droplet sizes sprayed at the outlet of the nozzle are significantly smaller than those obtained by the nozzles of the prior art mentioned above. It is estimated that we gain about 30% on the size of the droplets sprayed at the outlet.
  • the average diameter of the droplets can be between approximately 95 microns and approximately 65 microns.
  • a side effect of this particular nozzle structure according to the invention is an acceptance of higher tolerances of concentricity of the outlet hole with respect to the swirl chamber when spraying relatively viscous liquids: the spraying is excellent when the outlet is centered, but remains acceptable when the outlet hole is slightly off center. Good results can be obtained up to an offset offset of about 80 microns, for liquids whose viscosity is between 800 and 1000 mPa. s.
  • the inner face with a concave profile of the first transfer channel is generally circular according to a radius of between one and a half and two times the radial distance DR between the coaxial circular channel and the swirl chamber. This reduces the presence of dead zones, that is to say zones in which the liquid takes a slow speed in the spray nozzle, and the spraying is improved.
  • the inner face with concave profile of the first transfer channel is connected to the inner wall of coaxial circular channel by a convex rounded area. This feature also reduces the presence of dead spots, and improves spraying.
  • an outer face with a generally rectilinear profile of the first transfer channel which is connected to the inner wall of a coaxial circular channel by a rounded convex zone.
  • the invention provides a liquid sprayer, which comprises a spray nozzle as defined above.
  • a sprayer has advantages in particular when it contains a liquid to be sprayed whose viscosity is between 800 and 1000 mPa. s approximately, and whose density is between 1000 and 1100 kg / m 3 approximately.
  • FIG. 2 is a cross section on a larger scale along the plane A-A of Figure 1;
  • FIG. 3 is an enlarged view of the front region of the spray nozzle of Figure 1, in section along the surface C-C of Figure 2;
  • Figure 4 is a partial view of Figure 2, showing on a larger scale the curvature of the channel faces;
  • FIG. 5 is a general schematic view of a sprayer according to the invention.
  • a spray nozzle according to the invention comprises a nozzle body 1 comprising a cylindrical housing 2 open towards the rear and closed towards the front by a front wall 3.
  • a generally cylindrical core 4 with a full front face 5 is engaged coaxially in the cylindrical housing 2 of the nozzle body 1, coming to bear on the rear face 6 of the front wall 3.
  • a swirl chamber 7 is thus distinguished, having a general shape of revolution around the longitudinal axis II, limited by a peripheral wall 8, by a rear wall formed by the core 4, and by a front wall 9 pierced with a coaxial outlet hole 10.
  • the spray nozzle comprises at least one coaxial circular channel 11 placed around the swirl chamber 7 and communicating with said swirl chamber 7 by a plurality of first oblique transfer channels such as channels 12, 13, 14 and 15.
  • the first transfer channels 12-15 tangentially inject the liquid into the swirl chamber 7 by giving it a rotation about the axis II, for example in the direction of rotation of the needles of a watch in FIG. 2.
  • a plurality of second transfer channels such as channels 16, 17, 18 and 19 conduct the liquid from a liquid inlet 20 and inject it tangentially into the coaxial circular channel 11.
  • the liquid is in rotation in the same direction of rotation as in the vortex chamber 7, that is to say clockwise in the example of FIG. 2.
  • the first transfer channels 12-15 are distributed equitably around the swirl chamber 7 and have the same shape, so that the spray nozzle has symmetry about the longitudinal axis I-I. We will therefore describe the shape of only one of the first transfer channels. This shape is as shown to scale in Figures 2 and 4, which may be referred to for more details.
  • the first transfer channel 14 is limited by an external face 21 and by an internal face 22: the external face 21 is the face furthest from the longitudinal axis II, while the internal face 22 is the face closest to longitudinal axis II.
  • the external face 21 has a generally rectilinear profile and is tangentially connected according to the connection zone 23 to the peripheral wall 8 of the swirl chamber 7.
  • the inner face 22 of the first transfer channel 14 has a concave profile L1 over most of its length.
  • the inner face 22 with concave profile L1 can be generally circular according to a radius advantageously between one and a half and two times the radial distance DR between the coaxial circular channel 11 and the swirl chamber 7.
  • the inner face 22 with concave profile L1 of the first transfer channel can be connected to the interior wall 35 of the coaxial circular channel 11 by a convex rounded zone 24.
  • the external face 21 with a generally rectilinear profile of the first transfer channel 14 can be connected to the internal wall 35 of the coaxial circular channel 11 by a convex rounded zone 25.
  • the inner face 22 with a concave profile Ll of the first transfer channel 14 can be connected to the peripheral wall 8 of the swirl chamber 7 by a rounded convex connection zone 26 with a small radius.
  • the radius of curvature of the convex connection zone 26 can be between approximately 50 microns and 80 microns.
  • the coaxial outlet hole 10 can advantageously be centered on the longitudinal axis I-I according to a tolerance of less than approximately 80 microns, preferably less than 60 microns. Likewise, the exit coaxial hole 10 can be aligned on the longitudinal axis I-I with a deviation tolerance of less than approximately 4 °.
  • the cross section of the first transfer channels 12-15 can advantageously be reduced progressively from the coaxial circular channel 11 towards the swirl chamber 7.
  • Their anterior (in the anterior wall 3) and posterior (anterior face 5 of the core 4) faces advantageously be parallel, to facilitate manufacture.
  • the nozzle structure thus defined promotes the acceleration of the fluid inside the channels and in the swirl chamber, thus producing at the outlet of the nozzle a spraying with particularly fine droplets, the size of which is approximately 30% smaller. compared to the droplets obtained by known spray nozzles.
  • the general dimensions of the spray nozzle according to the invention can be chosen as a function of the desired flow rate of liquid.
  • a liquid sprayer 27 comprises a container 28, a pump 29 and a spray nozzle 30 as defined above.
  • the pump is activated 29 which sucks the liquid 32 from the container 28 through a dip tube 33 and injects it under pressure into the spray nozzle 30 which produces, at the outlet, a spray cone 34.
  • the particular structure of the spray nozzle 30 according to the invention allows the correct operation of such a sprayer 27 containing a liquid 32 to be sprayed, the viscosity of which may be greater than that of water, which may be between 800 and 1000 mPa .s approximately, and whose density is between 1000 and 1100 kg / m 3 approximately. Good results can also be obtained when the liquid 32 has thixotropic properties.

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  • Nozzles (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

According to the invention, the swirl chamber (7) in a liquid spray nozzle communicates with the outside by means of a coaxial outlet hole (10) and communicates with a coaxial circular channel (11) by means of numerous oblique first transfer channels (12-15). Each first transfer channel (14) is delimited by an external face (21) having a generally rectilinear profile which connects tangentially to the peripheral wall (8) of the swirl chamber (7), while the internal face is provided with a concave profile (L1) over most of the length thereof. In this way, the fineness of the droplets sprayed from the nozzle is improved, particularly when the liquid has a viscosity greater than that of water.

Description

BUSE DE PULVERISATION A CANAUX PROFILES PROFILED CHANNEL SPRAY NOZZLE
DOMAINE TECHNIQUE DE L'INVENTION La présente invention concerne les buses de pulvérisation de liquides, dans lesquelles un liquide à pulvériser est amené dans une chambre centrale de tourbillonnement par des canaux de transfert périphériques injectant tangentiellement le liquide qui tourbillonne dans la chambre centrale de tourbillonnement et sort ensuite de la chambre centrale de tourbillonnement par un passage coaxial de sortie vers l'atmosphère.TECHNICAL FIELD OF THE INVENTION The present invention relates to liquid spray nozzles, in which a liquid to be sprayed is brought into a central swirl chamber by peripheral transfer channels tangentially injecting the liquid which swirls into the central swirl chamber and then leaves the central swirl chamber by a coaxial outlet passage to the atmosphere.
De telles buses de pulvérisation sont susceptibles d'être utilisées dans des pulvérisateurs, en association avec des pompes de pulvérisation à actionnement manuel ou avec un gaz pousseur, notamment pour la pulvérisation de produits cosmétiques . On connaît déjà de telles buses de pulvérisation, décrites notamment dans le document EP 0 000 688 A, comprenant une chambre de tourbillonnement ayant une forme générale de révolution autour d'un axe longitudinal, limitée par une paroi périphérique, par une paroi postérieure, et par une paroi frontale percée d'un trou coaxial de sortie . Un canal circulaire coaxial entoure la chambre de tourbillonnement, et communique avec ladite chambre de tourbillonnement par une pluralité de premiers canaux de transfert périphériques obliques qui injectent le liquide en rotation dans un sens de rotation dans la chambre de tourbillonnement. Une pluralité de seconds canaux de transfert conduisent le liquide depuis une entrée de liquide et l'injectent dans le canal circulaire coaxial en rotation selon ledit sens de rotation. Les premiers canaux de transfert sont limités chacun par une face extérieure à profil rectiligne qui se raccorde tangentiellement à la paroi périphérique de la chambre de tourbillonnement, et qui se raccorde angulairement à la paroi intérieure du canal circulaire coaxial. Lesdits premiers canaux de transfert sont limités chacun par une face intérieure à profil rectiligne et qui se raccorde angulairement à la paroi périphérique de la chambre de tourbillonnement et qui se raccorde angulairement à la paroi intérieure du canal circulaire coaxial . La section transversale des premiers canaux de transfert se réduit progressivement depuis le canal circulaire coaxial vers la chambre de tourbillonnement.Such spray nozzles may be used in sprayers, in combination with spray pumps with manual actuation or with a pusher gas, in particular for spraying cosmetic products. There are already known such spray nozzles, described in particular in document EP 0 000 688 A, comprising a swirl chamber having a general shape of revolution around a longitudinal axis, limited by a peripheral wall, by a rear wall, and by a front wall pierced with a coaxial outlet hole. A coaxial circular channel surrounds the swirl chamber, and communicates with said swirl chamber through a plurality of first oblique peripheral transfer channels which inject the rotating liquid in a direction of rotation into the swirl chamber. A plurality of second transfer channels conduct the liquid from a liquid inlet and inject it into the coaxial circular channel in rotation in said direction of rotation. The first transfer channels are each limited by an outer face with a straight profile which tangentially connects to the peripheral wall of the swirl chamber, and which angularly connects to the inner wall of the coaxial circular channel. Said first transfer channels are each limited by an inner face with a rectilinear profile and which is angularly connected to the peripheral wall of the swirl chamber and which is angularly connected to the internal wall of the coaxial circular channel. The cross section of the first transfer channels is reduced gradually from the coaxial circular channel to the swirl chamber.
De telles buses de pulvérisation fonctionnent correctement pour la pulvérisation de liquides à faible viscosité tels que l'eau, en produisant des gouttelettes de tailles satisfaisantes, de l'ordre de 90 microns.Such spray nozzles work well for spraying low viscosity liquids such as water, producing droplets of satisfactory size, on the order of 90 microns.
Cependant, de telles buses de pulvérisation produisent une pulvérisation très insuffisante, c'est-à-dire des tailles de gouttelettes beaucoup trop grosses, lorsque le liquide à pulvériser présente une viscosité plus grande que celle de l'eau. Ce défaut empêche l'utilisation satisfaisante de telles buses de pulvérisation pour la pulvérisation de produits cosmétiques ayant des viscosités moyennes, par exemple des viscosités supérieures à 800 mPa.s. En outre, dans une fabrication en série, on constate que les qualités de pulvérisation varient considérablement en fonction des buses considérées. Cela résulte vraisemblablement des variations de dimensions des buses à l'intérieur des tolérances de fabrication. EXPOSE DE L'INVENTIONHowever, such spray nozzles produce a very insufficient spray, that is to say much too large droplet sizes, when the liquid to be sprayed has a viscosity greater than that of water. This defect prevents the satisfactory use of such spray nozzles for spraying cosmetic products having medium viscosities, for example viscosities greater than 800 mPa.s. In addition, in mass production, it is found that the spraying qualities vary considerably depending on the nozzles considered. This is likely due to variations in nozzle sizes within manufacturing tolerances. STATEMENT OF THE INVENTION
Le problème proposé par la présente invention est de réduire la taille des gouttelettes pulvérisées en sortie d'une buse alimentée en liquide à viscosité moyenne ou alimentée en gel.The problem proposed by the present invention is to reduce the size of the droplets sprayed at the outlet of a nozzle supplied with medium viscosity liquid or supplied with gel.
L'invention résulte de l'observation selon laquelle une réduction des tailles de gouttelettes pulvérisées en sortie de la buse peut être obtenue en favorisant l'accélération du fluide vers la paroi périphérique de la chambre de tourbillonnement, et en évitant autant que possible les zones mortes à faible vitesse du liquide dans les canaux ou chambres de la buse de pulvérisation. Pour atteindre ces objets ainsi que d'autres, une buse de pulvérisation selon l'invention, pour la pulvérisation de liquides, comprend :The invention results from the observation that a reduction in the sizes of droplets sprayed at the outlet of the nozzle can be obtained by promoting the acceleration of the fluid towards the peripheral wall of the swirl chamber, and by avoiding as much as possible the zones dead at low speed of the liquid in the channels or chambers of the spray nozzle. To achieve these and other objects, a spray nozzle according to the invention, for spraying liquids, comprises:
- une chambre de tourbillonnement ayant une forme générale de révolution autour d'un axe longitudinal, limitée par une paroi périphérique, par une paroi postérieure, et par une paroi frontale percée d'un trou coaxial de sortie, - au moins un canal circulaire coaxial agencé autour de la chambre de tourbillonnement et communiquant avec ladite chambre de tourbillonnement par une pluralité de premiers canaux de transfert obliques injectant le liquide en rotation dans un sens de rotation dans la chambre de tourbillonnement,a swirl chamber having a general shape of revolution around a longitudinal axis, limited by a peripheral wall, by a rear wall, and by a front wall pierced with a coaxial outlet hole, at least one coaxial circular channel arranged around the swirl chamber and communicating with said swirl chamber by a plurality of first oblique transfer channels injecting the liquid in rotation in a direction of rotation into the swirl chamber,
- une pluralité de seconds canaux de transfert pour conduire le liquide depuis une entrée de liquide et l'injecter dans le canal circulaire coaxial en rotation selon ledit sens de rotation,a plurality of second transfer channels for conducting the liquid from a liquid inlet and injecting it into the coaxial circular channel in rotation according to said direction of rotation,
- les premiers canaux de transfert sont limités chacun par une face extérieure à profil généralement rectiligne et se raccordant tangentiellement à la paroi périphérique de la chambre de tourbillonnement,the first transfer channels are each limited by an outer face with a generally rectilinear profile and tangentially connecting to the peripheral wall of the swirl chamber,
- les premiers canaux de transfert sont limités chacun par une face intérieure ayant un profil concave sur la plus grande partie de sa longueur.- The first transfer channels are each limited by an inner face having a concave profile over most of its length.
Avec une telle structure de buse de pulvérisation, on constate que les tailles de gouttelettes pulvérisées en sortie de la buse sont nettement plus faibles que celles obtenues par les buses de l'art antérieur mentionné ci-dessus. On estime que l'on gagne environ 30 % sur la taille des gouttelettes pulvérisées en sortie. Pour des liquides à viscosité moyenne, par exemple comprise entre 800 et 1 000 Pa.s, le diamètre moyen des gouttelettes peut être compris entre 95 microns environ et 65 microns environ.With such a spray nozzle structure, it can be seen that the droplet sizes sprayed at the outlet of the nozzle are significantly smaller than those obtained by the nozzles of the prior art mentioned above. It is estimated that we gain about 30% on the size of the droplets sprayed at the outlet. For liquids with medium viscosity, for example between 800 and 1000 Pa.s, the average diameter of the droplets can be between approximately 95 microns and approximately 65 microns.
Un effet secondaire de cette structure particulière de buse selon l'invention est une acceptation de tolérances plus élevées de concentricité du trou de sortie par rapport à la chambre de tourbillonnement lorsqu'on pulvérise des liquides relativement visqueux : la pulvérisation est excellente lorsque le trou de sortie est centré, mais elle reste acceptable lorsque le trou de sortie est légèrement décentré. De bons résultats peuvent être obtenus jusqu'à un écart de décentrage d'environ 80 microns, pour des liquides dont la viscosité est comprise entre 800 et 1 000 mPa . s .A side effect of this particular nozzle structure according to the invention is an acceptance of higher tolerances of concentricity of the outlet hole with respect to the swirl chamber when spraying relatively viscous liquids: the spraying is excellent when the outlet is centered, but remains acceptable when the outlet hole is slightly off center. Good results can be obtained up to an offset offset of about 80 microns, for liquids whose viscosity is between 800 and 1000 mPa. s.
A l'inverse, dans les buses de pulvérisation connues, un décentrage du trou de sortie entraîne une dégradation sensible de la pulvérisation. Selon un mode de réalisation préféré, la face intérieure à profil concave de premier canal de transfert est généralement circulaire selon un rayon compris entre une fois et demie et deux fois la distance radiale DR entre le canal circulaire coaxial et la chambre de tourbillonnement. On réduit ainsi la présence de zones mortes, c'est-à-dire de zones dans lesquelles le liquide prend une faible vitesse dans la buse de pulvérisation, et la pulvérisation s'en trouve améliorée.Conversely, in known spray nozzles, off-centering of the outlet hole results in significant degradation of the spray. According to a preferred embodiment, the inner face with a concave profile of the first transfer channel is generally circular according to a radius of between one and a half and two times the radial distance DR between the coaxial circular channel and the swirl chamber. This reduces the presence of dead zones, that is to say zones in which the liquid takes a slow speed in the spray nozzle, and the spraying is improved.
Selon une réalisation avantageuse, la face intérieure à profil concave de premier canal de transfert se raccorde à la paroi intérieure de canal circulaire coaxial par une zone arrondie convexe. Cette caractéristique réduit également la présence de zones mortes, et améliore la pulvérisation.According to an advantageous embodiment, the inner face with concave profile of the first transfer channel is connected to the inner wall of coaxial circular channel by a convex rounded area. This feature also reduces the presence of dead spots, and improves spraying.
Pour les mêmes raisons, on peut également préférer une face extérieure à profil généralement rectiligne de premier canal de transfert qui se raccorde à la paroi intérieure de canal circulaire coaxial par une zone arrondie convexe .For the same reasons, it is also possible to prefer an outer face with a generally rectilinear profile of the first transfer channel which is connected to the inner wall of a coaxial circular channel by a rounded convex zone.
Enfin, on peut trouver avantage, pour améliorer la pulvérisation, à prévoir que la face intérieure à profil concave de premier canal de transfert se raccorde à la paroi périphérique de chambre de tourbillonnement par une zone de raccordement arrondie convexe .Finally, it may be advantageous, in order to improve the spraying, to provide that the inner face with a concave profile of the first transfer channel is connected to the peripheral wall of the swirl chamber by a convex rounded connection zone.
L'invention prévoit un pulvérisateur de liquides, qui comprend une buse de pulvérisation telle que définie ci-dessus. Un tel pulvérisateur présente des avantages en particulier lorsqu'il contient un liquide à pulvériser dont la viscosité est comprise entre 800 et 1 000 mPa . s environ, et dont la densité est comprise entre 1 000 et 1 100 kg/m3 environ.The invention provides a liquid sprayer, which comprises a spray nozzle as defined above. Such a sprayer has advantages in particular when it contains a liquid to be sprayed whose viscosity is between 800 and 1000 mPa. s approximately, and whose density is between 1000 and 1100 kg / m 3 approximately.
D'excellents résultats sont obtenus lorsque le pulvérisateur contient un liquide thixotropique .Excellent results are obtained when the sprayer contains a thixotropic liquid.
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: - la figure 1 est une vue de côté globale en coupe longitudinale d'une buse de pulvérisation selon un mode de réalisation particulier de l'invention ;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: - Figure 1 is an overall side view in longitudinal section of a spray nozzle according to a particular embodiment of the invention;
- la figure 2 est une coupe transversale à plus grande échelle selon le plan A-A de la figure 1 ;- Figure 2 is a cross section on a larger scale along the plane A-A of Figure 1;
- la figure 3 est une vue à plus grande échelle de la zone antérieure de la buse de pulvérisation de figure 1, en coupe selon la surface C-C de la figure 2 ;- Figure 3 is an enlarged view of the front region of the spray nozzle of Figure 1, in section along the surface C-C of Figure 2;
- la figure 4 est une vue partielle de la figure 2, montrant à plus grande échelle la courbure des faces de canaux ; et- Figure 4 is a partial view of Figure 2, showing on a larger scale the curvature of the channel faces; and
- la figure 5 est une vue schématique générale d'un pulvérisateur selon l'invention.- Figure 5 is a general schematic view of a sprayer according to the invention.
DESCRIPTION DES MODES DE REALISATION PREFERES Dans le mode de réalisation illustré sur les figures, une buse de pulvérisation selon l'invention comprend un corps de buse 1 comportant un logement cylindrique 2 ouvert vers l'arrière et obturé vers 1 ' avant par une paroi antérieure 3. Un noyau 4 généralement cylindrique à face antérieure 5 pleine est engagé coaxialement dans le logement cylindrique 2 du corps de buse 1, venant en appui sur la face postérieure 6 de la paroi antérieure 3.DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment illustrated in the figures, a spray nozzle according to the invention comprises a nozzle body 1 comprising a cylindrical housing 2 open towards the rear and closed towards the front by a front wall 3. A generally cylindrical core 4 with a full front face 5 is engaged coaxially in the cylindrical housing 2 of the nozzle body 1, coming to bear on the rear face 6 of the front wall 3.
Des logements et rainures sont prévus sur la face postérieure 6 de la paroi antérieure 3, pour former les chambres et canaux de la buse de pulvérisation selon l'invention. On distingue ainsi une chambre de tourbillonnement 7, ayant une forme générale de révolution autour de l'axe longitudinal I-I, limitée par une paroi périphérique 8, par une paroi postérieure formée par le noyau 4, et par une paroi frontale 9 percée d'un trou coaxial de sortie 10.Housing and grooves are provided on the rear face 6 of the front wall 3, to form the chambers and channels of the spray nozzle according to the invention. A swirl chamber 7 is thus distinguished, having a general shape of revolution around the longitudinal axis II, limited by a peripheral wall 8, by a rear wall formed by the core 4, and by a front wall 9 pierced with a coaxial outlet hole 10.
La buse de pulvérisation comprend au moins un canal circulaire coaxial 11 placé autour de la chambre de tourbillonnement 7 et communiquant avec ladite chambre de tourbillonnement 7 par une pluralité de premiers canaux de transfert obliques tels que les canaux 12, 13, 14 et 15. Les premiers canaux de transfert 12-15 injectent tangentiellement le liquide dans la chambre de tourbillonnement 7 en lui imprimant une rotation autour de l'axe I-I, par exemple dans le sens de rotation des aiguilles d'une montre sur la figure 2. Une pluralité de seconds canaux de transfert tels que les canaux 16, 17, 18 et 19 conduisent le liquide depuis une entrée de liquide 20 et l'injectent tangentiellement dans le canal circulaire coaxial 11. Dans le canal circulaire coaxial 11, le liquide est en rotation dans le même sens de rotation que dans la chambre .de tourbillonnement 7, c'est-à-dire dans le sens des aiguilles d'une montre dans 1 ' exemple de la figure 2.The spray nozzle comprises at least one coaxial circular channel 11 placed around the swirl chamber 7 and communicating with said swirl chamber 7 by a plurality of first oblique transfer channels such as channels 12, 13, 14 and 15. The first transfer channels 12-15 tangentially inject the liquid into the swirl chamber 7 by giving it a rotation about the axis II, for example in the direction of rotation of the needles of a watch in FIG. 2. A plurality of second transfer channels such as channels 16, 17, 18 and 19 conduct the liquid from a liquid inlet 20 and inject it tangentially into the coaxial circular channel 11. In the coaxial circular channel 11, the liquid is in rotation in the same direction of rotation as in the vortex chamber 7, that is to say clockwise in the example of FIG. 2.
Les premiers canaux de transfert 12-15 sont répartis équitablement autour de la chambre de tourbillonnement 7 et présentent la même forme, afin que la buse de pulvérisation présente une symétrie autour de l'axe longitudinal I-I. On décrira donc la forme d'un seul des premiers canaux de transfert. Cette forme est telle que représentée à l'échelle sur les figures 2 et 4, auxquelles on pourra se référer pour plus de détails . Ainsi, sur la figure 4, le premier canal de transfert 14 est limité par une face extérieure 21 et par une face intérieure 22 : la face extérieure 21 est la face la plus éloignée de l'axe longitudinal I-I, tandis que la face intérieure 22 est la face la plus proche de l'axe longitudinal I-I. La face extérieure 21 présente un profil généralement rectiligne et se raccorde tangentiellement selon la zone de raccordement 23 à la paroi périphérique 8 de la chambre de tourbillonnement 7.The first transfer channels 12-15 are distributed equitably around the swirl chamber 7 and have the same shape, so that the spray nozzle has symmetry about the longitudinal axis I-I. We will therefore describe the shape of only one of the first transfer channels. This shape is as shown to scale in Figures 2 and 4, which may be referred to for more details. Thus, in FIG. 4, the first transfer channel 14 is limited by an external face 21 and by an internal face 22: the external face 21 is the face furthest from the longitudinal axis II, while the internal face 22 is the face closest to longitudinal axis II. The external face 21 has a generally rectilinear profile and is tangentially connected according to the connection zone 23 to the peripheral wall 8 of the swirl chamber 7.
La face intérieure 22 du premier canal de transfert 14 présente un profil concave Ll sur la plus grande partie de sa longueur.The inner face 22 of the first transfer channel 14 has a concave profile L1 over most of its length.
La face intérieure 22 à profil concave Ll peut être généralement circulaire selon un rayon avantageusement compris entre une fois et demie et deux fois la distance radiale DR entre le canal circulaire coaxial 11 et la chambre de tourbillonnement 7. La face intérieure 22 à profil concave Ll de premier canal de transfert peut se raccorder à la paroi intérieure 35 du canal circulaire coaxial 11 par une zone arrondie convexe 24.The inner face 22 with concave profile L1 can be generally circular according to a radius advantageously between one and a half and two times the radial distance DR between the coaxial circular channel 11 and the swirl chamber 7. The inner face 22 with concave profile L1 of the first transfer channel can be connected to the interior wall 35 of the coaxial circular channel 11 by a convex rounded zone 24.
La face extérieure 21 à profil généralement rectiligne du premier canal de transfert 14 peut se raccorder à la paroi intérieure 35 du canal circulaire coaxial 11 par une zone arrondie convexe 25. Enfin, la face intérieure 22 à profil concave Ll de premier canal de transfert 14 peut se raccorder à la paroi périphérique 8 de chambre de tourbillonnement 7 par une zone de raccordement 26 arrondie convexe à faible rayon. Le rayon de courbure de la zone de raccordement 26 convexe peut être compris entre 50 microns et 80 microns environ.The external face 21 with a generally rectilinear profile of the first transfer channel 14 can be connected to the internal wall 35 of the coaxial circular channel 11 by a convex rounded zone 25. Finally, the inner face 22 with a concave profile Ll of the first transfer channel 14 can be connected to the peripheral wall 8 of the swirl chamber 7 by a rounded convex connection zone 26 with a small radius. The radius of curvature of the convex connection zone 26 can be between approximately 50 microns and 80 microns.
Le trou coaxial de sortie 10 peut avantageusement être centré sur l'axe longitudinal I-I selon une tolérance inférieure à 80 microns environ, de préférence inférieure à 60 microns. De même, le trou coaxial de sortie 10 peut être aligné sur l'axe longitudinal I-I avec une tolérance de déviation inférieure à 4° environ.The coaxial outlet hole 10 can advantageously be centered on the longitudinal axis I-I according to a tolerance of less than approximately 80 microns, preferably less than 60 microns. Likewise, the exit coaxial hole 10 can be aligned on the longitudinal axis I-I with a deviation tolerance of less than approximately 4 °.
La section transversale des premiers canaux de transfert 12-15 peut avantageusement se réduire progressivement depuis le canal circulaire coaxial 11 vers la chambre de tourbillonnement 7. Leurs faces antérieure (dans la paroi antérieure 3) et postérieure (face antérieure 5 du noyau 4) peuvent avantageusement être parallèles, pour en faciliter la fabrication.The cross section of the first transfer channels 12-15 can advantageously be reduced progressively from the coaxial circular channel 11 towards the swirl chamber 7. Their anterior (in the anterior wall 3) and posterior (anterior face 5 of the core 4) faces advantageously be parallel, to facilitate manufacture.
La structure de buse ainsi définie favorise l'accélération du fluide à 1 ' intérieur des canaux et dans la chambre de tourbillonnement, produisant ainsi en sortie de la buse une pulvérisation à gouttelettes particulièrement fines, dont la taille est inférieure d'environ 30 % par rapport aux gouttelettes obtenues par les buses de pulvérisation connues. Les dimensions générales de la buse de pulvérisation selon l'invention peuvent être choisies en fonction du débit désiré de liquide. On peut notamment réaliser des buses de pulvérisation de petite taille pour les applications cosmétiques, ayant par exemple les principales dimensions suivantes : - diamètre de chambre de tourbillonnement : 1 mm environ ;The nozzle structure thus defined promotes the acceleration of the fluid inside the channels and in the swirl chamber, thus producing at the outlet of the nozzle a spraying with particularly fine droplets, the size of which is approximately 30% smaller. compared to the droplets obtained by known spray nozzles. The general dimensions of the spray nozzle according to the invention can be chosen as a function of the desired flow rate of liquid. One can in particular produce small spray nozzles for cosmetic applications, for example having the following main dimensions: - diameter of the swirl chamber: about 1 mm;
- longueur de chambre de tourbillonnement : 0,19 mm environ ;- length of the swirl chamber: approximately 0.19 mm;
- diamètre intérieur du canal circulaire : 2,4 mm environ ;- internal diameter of the circular channel: approximately 2.4 mm;
- diamètre extérieur du canal circulaire : 3 mm environ.- outside diameter of the circular channel: approximately 3 mm.
Dans la réalisation illustrée schématiquement sur la figure 5, un pulvérisateur de liquide 27 comprend un récipient 28, une pompe 29 et une buse de pulvérisation 30 telle que définie précédemment. Par actionnement du bouton 31, on actionne la pompe 29 qui aspire le liquide 32 du récipient 28 par un tube plongeur 33 et l'injecte sous pression dans la buse de pulvérisation 30 qui produit, en sortie, un cône de pulvérisation 34.In the embodiment schematically illustrated in Figure 5, a liquid sprayer 27 comprises a container 28, a pump 29 and a spray nozzle 30 as defined above. By pressing button 31, the pump is activated 29 which sucks the liquid 32 from the container 28 through a dip tube 33 and injects it under pressure into the spray nozzle 30 which produces, at the outlet, a spray cone 34.
La structure particulière de buse de pulvérisation 30 selon l'invention permet le fonctionnement correct d'un tel pulvérisateur 27 contenant un liquide 32 à pulvériser dont la viscosité peut être supérieure à celle de l'eau, pouvant être comprise entre 800 et 1 000 mPa.s environ, et dont la densité est comprise entre 1 000 et 1 100 kg/m3 environ. De bons résultats peuvent également être obtenus lorsque le liquide 32 présente des propriétés thixotropiques .The particular structure of the spray nozzle 30 according to the invention allows the correct operation of such a sprayer 27 containing a liquid 32 to be sprayed, the viscosity of which may be greater than that of water, which may be between 800 and 1000 mPa .s approximately, and whose density is between 1000 and 1100 kg / m 3 approximately. Good results can also be obtained when the liquid 32 has thixotropic properties.
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 pour la pulvérisation de liquides, comprenant :CLAIMS 1 - Spray nozzle for spraying liquids, comprising:
- une chambre de tourbillonnement (7) ayant une forme générale de révolution autour d'un axe longitudinal (I-I), limitée par une paroi périphérique (8), par une paroi postérieure (4), et par une paroi frontale (9) percée d'un trou coaxial de sortie (10),- a swirl chamber (7) having a general shape of revolution around a longitudinal axis (II), limited by a peripheral wall (8), by a rear wall (4), and by a pierced front wall (9) a coaxial outlet hole (10),
- au moins un canal circulaire coaxial (11) agencé autour de la chambre de tourbillonnement (7) et communiquant avec ladite chambre de tourbillonnement (7) par une pluralité de premiers canaux de transfert (12-15) obliques injectant le liquide en rotation dans un sens de rotation dans la chambre de tourbillonnement (7), une pluralité de seconds canaux de transfert (16-19) pour conduire le liquide depuis une entrée de liquide (20) et l'injecter dans le canal circulaire coaxial (11) en rotation selon ledit sens de rotation, caractérisée en ce que :- at least one coaxial circular channel (11) arranged around the swirl chamber (7) and communicating with said swirl chamber (7) by a plurality of first oblique transfer channels (12-15) injecting the rotating liquid into a direction of rotation in the swirl chamber (7), a plurality of second transfer channels (16-19) for conducting the liquid from a liquid inlet (20) and injecting it into the coaxial circular channel (11) in rotation in said direction of rotation, characterized in that:
- les premiers canaux de transfert (12-15) sont limités chacun par une face extérieure (21) à profil généralement rectiligne et se raccordant tangentiellement à la paroi périphérique (8) de la chambre de tourbillonnement (7),the first transfer channels (12-15) are each limited by an outer face (21) with a generally rectilinear profile and tangentially connecting to the peripheral wall (8) of the swirl chamber (7),
- les premiers canaux de transfert (12-15) sont limités chacun par une face intérieure (22) ayant un profil concave (Ll) sur la plus grande partie de sa longueur. 2 - Buse de pulvérisation selon la revendication 1, caractérisée en ce que la face intérieure (22) à profil concave (Ll) de premier canal de transfert (12-15) est généralement circulaire selon un rayon compris entre une fois et demie et deux fois la distance radiale (DR) entre le canal circulaire coaxial (11) et la chambre de tourbillonnement (7) .- The first transfer channels (12-15) are each limited by an inner face (22) having a concave profile (L1) over most of its length. 2 - Spray nozzle according to claim 1, characterized in that the inner face (22) with concave profile (Ll) of the first transfer channel (12-15) is generally circular according to a radius of between one and a half and two times times the radial distance (DR) between the coaxial circular channel (11) and the swirl chamber (7).
3 - Buse de pulvérisation selon l'une des revendications 1 ou 2, caractérisée en ce que la face intérieure (22) à profil concave (Ll) de premier canal de transfert (12-15) se raccorde à la paroi intérieure (35) de canal circulaire coaxial (11) par une zone arrondie convexe (24) .3 - Spray nozzle according to one of claims 1 or 2, characterized in that the inner face (22) with concave profile (Ll) of the first transfer channel (12-15) is connected to the inner wall (35) coaxial circular channel (11) by a convex rounded area (24).
4 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la face extérieure (21) à profil généralement rectiligne de premier canal de transfert (12-15) se raccorde à la paroi intérieure (35) de canal circulaire coaxial (11) par une zone arrondie convexe (25) .4 - Spray nozzle according to any one of claims 1 to 3, characterized in that the outer face (21) with generally rectilinear profile of the first transfer channel (12-15) is connected to the inner wall (35) of coaxial circular channel (11) by a convex rounded area (25).
5 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la face intérieure5 - Spray nozzle according to any one of claims 1 to 4, characterized in that the inner face
(22) à profil concave (Ll) de premier canal de transfert (12-15) se raccorde à la paroi périphérique (8) de chambre de tourbillonnement (7) par une zone de raccordement (26) arrondie convexe.(22) with concave profile (Ll) of the first transfer channel (12-15) is connected to the peripheral wall (8) of the swirl chamber (7) by a convex rounded connection zone (26).
6 - Buse de pulvérisation selon la revendication 5, caractérisée en ce que le rayon de courbure de la zone de raccordement (26) convexe est compris entre 50 microns et 80 microns environ.6 - Spray nozzle according to claim 5, characterized in that the radius of curvature of the convex connection zone (26) is between approximately 50 microns and 80 microns.
7 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le trou coaxial de sortie (10) est centré sur l'axe longitudinal (I-I) selon une tolérance inférieure à 80 microns environ, de préférence inférieure à 60 microns.7 - Spray nozzle according to any one of claims 1 to 6, characterized in that the coaxial outlet hole (10) is centered on the longitudinal axis (II) with a tolerance of less than about 80 microns, preferably less at 60 microns.
8 - Buse de pulvérisation selon la revendication 7, caractérisée en ce que le trou coaxial de sortie (10) est aligné sur l'axe longitudinal (I-I) avec une tolérance de déviation inférieure à 4° environ.8 - Spray nozzle according to claim 7, characterized in that the coaxial outlet hole (10) is aligned on the longitudinal axis (I-I) with a deviation tolerance of less than approximately 4 °.
9 - Pulvérisateur de liquide (27), comprenant une buse de pulvérisation (30) selon l'une quelconque des revendications 1 à 8.9 - Liquid sprayer (27), comprising a spray nozzle (30) according to any one of claims 1 to 8.
10 - Pulvérisateur (27) selon la revendication 9, caractérisé en ce qu'il contient un liquide (32) à pulvériser dont la viscosité est comprise entre 800 et 1 000 mPa.s environ, et dont la densité est comprise entre 1 000 et 1 100 kg/m3 environ.10 - Sprayer (27) according to claim 9, characterized in that it contains a liquid (32) to be sprayed whose viscosity is between 800 and 1000 mPa.s approximately, and whose density is between 1000 and 1,100 kg / m 3 approximately.
11 - Pulvérisateur (27) selon l'une des revendications 9 ou 10, caractérisé en ce qu'il contient un liquide thixotropique . 11 - Sprayer (27) according to one of claims 9 or 10, characterized in that it contains a thixotropic liquid.
EP02701496A 2001-03-05 2002-03-04 Spray nozzle with profiled channels Expired - Lifetime EP1365864B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0103129A FR2821573B1 (en) 2001-03-05 2001-03-05 PROFILED CHANNEL SPRAY NOZZLE
FR0103129 2001-03-05
PCT/IB2002/000658 WO2002070141A1 (en) 2001-03-05 2002-03-04 Spray nozzle with profiled channels

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EP1365864A1 true EP1365864A1 (en) 2003-12-03
EP1365864B1 EP1365864B1 (en) 2004-10-20

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AT (1) ATE279988T1 (en)
DE (1) DE60201663D1 (en)
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WO2002070141A8 (en) 2003-08-14
DE60201663D1 (en) 2004-11-25
WO2002070141A1 (en) 2002-09-12
ATE279988T1 (en) 2004-11-15
EP1365864B1 (en) 2004-10-20
FR2821573B1 (en) 2003-06-13
FR2821573A1 (en) 2002-09-06

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