EP1467818A1 - Atomisation nozzle with reduced diameter - Google Patents

Atomisation nozzle with reduced diameter

Info

Publication number
EP1467818A1
EP1467818A1 EP20030700410 EP03700410A EP1467818A1 EP 1467818 A1 EP1467818 A1 EP 1467818A1 EP 20030700410 EP20030700410 EP 20030700410 EP 03700410 A EP03700410 A EP 03700410A EP 1467818 A1 EP1467818 A1 EP 1467818A1
Authority
EP
European Patent Office
Prior art keywords
spray nozzle
nozzle according
channel
swirl chamber
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20030700410
Other languages
German (de)
French (fr)
Inventor
Jean-René BICKART
Pascal Meyer
Jean-Pierre Songbe
Hervé IMENEZ
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.)
Meadwestvaco Calmar SL
Verbena Corp NV
Original Assignee
Saint Gobain Calmar SA
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 Saint Gobain Calmar SA, Verbena Corp NV filed Critical Saint Gobain Calmar SA
Publication of EP1467818A1 publication Critical patent/EP1467818A1/en
Withdrawn legal-status Critical Current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 vortex chamber and then leaves the central vortex chamber via 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 push gas, in particular for spraying cosmetic products.
  • spray nozzles 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 straight profile 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 gradually reduced from the coaxial circular channel to the swirl chamber.
  • Such two-stage spray nozzles work relatively well for spraying liquids of low viscosity such as water, producing droplets of satisfactory sizes, of the order of 90 microns, distributed in a spray cone at the outlet of nozzle.
  • the problem proposed by the present invention is both to reduce the size of the droplets sprayed at the outlet of a nozzle supplied with liquid, to ensure a homogeneous distribution. droplets in the spray cone in the case of relatively low and variable fluid pressures produced by manual pumps of cosmetic spray devices, and to achieve these effects with a spray nozzle of reduced diameter.
  • 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,
  • the transfer channels are each limited by an outer face of generally rectilinear profile and tangentially connecting to the peripheral wall of the swirl chamber, the transfer channels are each limited by an inner face having a concave profile over most of its length,
  • the exit coaxial hole has a conical shape converging towards the exit.
  • the total diameter of the nozzle is significantly smaller than that of two-stage nozzles.
  • the droplet sizes sprayed at the outlet of the nozzle are much more weak than those obtained by the nozzles of the prior art mentioned above. It is estimated that about 30% is saved on the size of the droplets sprayed at the outlet, with an equal pressure generation system.
  • the average distribution of droplets is homogeneous in the spray cone at the nozzle outlet.
  • An advantageous effect of the invention is also a relative independence of the quality of spraying produced with respect to the pressures and flow rates supplied by the pusher device which introduces the liquid at the inlet of the nozzle.
  • Another 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 hole of 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 approximately 10% of the diameter of the outlet hole, for liquids whose viscosity is between 800 and 1000 mPa.s.
  • each transfer channel is supplied by a peripheral longitudinal supply channel from the inlet of the nozzle.
  • the inner face with a concave profile of the transfer channel is generally circular according to a radius of between one and a half and two times the radial distance DR between the corresponding peripheral longitudinal supply channel and the swirl chamber. .
  • the external wall of the peripheral longitudinal feed channel is connected to the front front wall of the corresponding transfer channel by a regular rounded area.
  • the inner face with a concave profile of the transfer channel is connected to the corresponding peripheral longitudinal feed channel by a convex rounded zone. This feature also reduces the presence of dead spots, and improves spraying.
  • the inner face with a concave profile of the transfer channel is connected to the peripheral wall of the swirl chamber by a convex rounded connection zone.
  • the cone angle of the outlet coaxial hole is between 15 ° and 30 °, advantageously about 20 °.
  • a better regularity of distribution of droplets at the outlet of the nozzle is also obtained by using transfer channels five in number, distributed regularly around the longitudinal axis of the nozzle. This effect apparently results from the fact that the greater number of channels reduces the duration of the transient spraying establishment regime and makes it possible to reach the steady state more quickly. Compared to a three-channel nozzle, the initial transient regime is reduced, and in particular the spraying angle at the nozzle outlet more quickly reaches the steady-state angle.
  • the invention provides a liquid sprayer, which comprises a spray nozzle as defined above.
  • a sprayer has advantages for spraying all types of liquids, and it also 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 1,000 and 1,100 kg / m 3 approximately. Excellent results are obtained when the sprayer contains a thixotropic liquid.
  • FIG. 1 is an overall side view in longitudinal section of a spray nozzle according to a particular embodiment of the invention, comprising a central core engaged in a female nozzle body;
  • FIG. 2 is a view of the rear face of the female nozzle body structure of Figure 1;
  • FIG. 3 is a diametrical longitudinal section of the female nozzle body structure along the plane C-C of Figure 2;
  • FIG. 4 is a rear three-quarter perspective view of the female nozzle body structure
  • Figure 5 is a partial rear view of Figure 2, showing on a larger scale the curvature of the faces of the channels;
  • FIG. 6 is a general schematic view of a sprayer according to the invention.
  • a spray nozzle according to ' 1' 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 core 4 (figure 1) generally cylindrical with a full front face 5 is engaged coaxially ent in the cylindrical housing 2 of the nozzle body 1, coming to bear on the rear face 6 of the front wall 3.
  • the front face 5 can advantageously be bordered by a leave 5a .
  • 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 five oblique transfer channels such as channels 11, 12, 13, 14 and 15.
  • the transfer channels 11-15 tangentially inject the liquid into the swirl chamber 7 by rotating it around the axis II, for example in the direction of rotation of the needles of a watch in FIG. 2.
  • Five peripheral longitudinal supply channels such as channels 16, 17, 18, 19 and 20 conduct the liquid from a liquid inlet 40 and inject it into a respective transfer channel 11-15.
  • the transfer channels 11-15 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 transfer channels. This shape is as shown to scale in Figures 2, 4 and 5, which may be referred to for more details.
  • the transfer channel 11 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 side closest to the longitudinal axis II.
  • the outer face 21 has a generally rectilinear profile and is connected tangentially along the connection zone 23 to the peripheral wall 8 of the swirl chamber 7.
  • the inner face 22 of the transfer channel 11 has a concave profile L1 over most of its length.
  • the inner face 22 with concave profile L1 may be generally circular according to a radius advantageously between one and a half and two times the radial distance DR between the corresponding peripheral longitudinal feed channel 16 and the swirl chamber 7.
  • the inner face 22 with a concave profile L1 of the transfer channel 11 can be connected to the peripheral longitudinal supply channel 16 by a convex rounded zone 24.
  • the external face 21 with a generally rectilinear profile of the transfer channel 11 can be connected to the peripheral longitudinal supply channel 16 by a convex rounded zone 25.
  • the inner face 22 with concave profile L1 of the transfer channel 11 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 with a tolerance of less than
  • the exit coaxial hole 10 can be aligned on the longitudinal axis I-I with a deviation tolerance of less than approximately 4 °.
  • the coaxial outlet hole 10 according to the invention is conical, converging downstream or towards the outlet of the nozzle.
  • the cone angle A of the outlet coaxial hole 10 is between approximately 15 ° and 30 °, advantageously approximately 20 °.
  • the coaxial outlet hole 10 is conical over most of its length from the inlet port.
  • the coaxial outlet hole 10 can be connected to the external face of the anterior wall 3 by a leave or an O-ring surface, without affecting spray performance.
  • the cross section of the first transfer channels 11-15 can advantageously be reduced progressively from the peripheral longitudinal supply channel towards the swirl chamber 7.
  • the interior and exterior faces can make an angle B of approximately 15 °.
  • Their anterior (in the anterior wall 3) and posterior (anterior face 5 of the core 4) faces may advantageously be parallel, to facilitate manufacture thereof.
  • the external wall of the peripheral longitudinal supply channel 16 is connected to the front front wall of the corresponding transfer channel 11 by a regular rounded zone 16a.
  • the flow of the fluid is improved by reducing its disturbances in the zone upstream from the transfer channels and from the swirl chamber.
  • the acceleration of the fluid takes place gradually from the inlet 40 of the nozzle to the outlet from the coaxial outlet hole 10. This promotes the spraying of all types of liquids, in particular thixotropic liquids.
  • the channel shapes are entirely produced in the nozzle body, the core 4 being simply cylindrical, possibly with a leave 5a. This facilitates the manufacture of the nozzle, making it possible to mass produce small diameter nozzles for cosmetic applications.
  • the shape of the nozzle according to the invention produces a dynamic spraying effect: depending on the pressure, the fractionation of the droplets remains satisfactory, but their distribution is modified in the spray cone.
  • the pressure is low, the droplets tend to concentrate in the center of the spray cone, while at higher pressures the droplets tend to distribute themselves around the periphery of the cone.
  • the pressure begins with low values, then gradually increases, then decreases to low values. The result that the droplets are first concentrated towards the center of the spray cone, then concentrated around the periphery and finally concentrated again at the center, so that the average distribution of the droplets is substantially constant in the spray cone at the end of the spray sequence.
  • 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 at least 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 29 is actuated which sucks the liquid 32 from the container 28 by 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.

Abstract

The invention relates to an atomisation nozzle in which the vortex chamber (7) is connected to the exterior by means of a conical convergent co-axial outlet hole (10) and communicates with the inlet by means of a number of oblique transfer channels (11, 15). Each first transfer channel (11) is defined by an external face (21) having a profile generally rectilinear which connects tangentially to the peripheral wall (8) of the vortex chamber (7), whilst the internal face (22) has a concave profile over the greater part of the length thereof. The distribution and fineness of the atomised particles exiting from the nozzle are thus improved, particularly when the liquid has a viscosity greater than that of water.

Description

BUSE DE PULVERISATION A DIAMETRE REDUIT 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. De telles buses de pulvérisation sont susceptibles d'être utilisées dans des pulvérisateurs, en association avec dès pompes de pulvérisation à actionnement manuel ou avec un gaz pousseur, notamment pour la pulvérisation de produits cosmétiques. 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 vortex chamber and then leaves the central vortex chamber via 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 push gas, in particular for spraying cosmetic products.
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 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. De telles buses de pulvérisation à deux étages fonctionnent relativement bien 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, réparties selon un cône de pulvérisation en sortie de buse.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 straight profile 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 gradually reduced from the coaxial circular channel to the swirl chamber. Such two-stage spray nozzles work relatively well for spraying liquids of low viscosity such as water, producing droplets of satisfactory sizes, of the order of 90 microns, distributed in a spray cone at the outlet of nozzle.
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 0,8 Pa.s.However, 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 0.8 Pa.s.
La présence du canal circulaire coaxial et des seconds canaux de transfert augmente le diamètre de la buse, et réduit ses possibilités d'intégration dans les têtes de pulvérisation miniaturisées des dispositifs de pulvérisation de cosmétiques. Mais d'autre part leur présence paraît nécessaire pour réaliser une pulvérisation correcte des liquides à faible viscosité. Une autre difficulté résulte de la pression de fluide relativement faible produite par les pompes manuelles des dispositifs de pulvérisation de cosmétiques, qui réduit encore les capacités de pulvérisation et tend à augmenter la taille des gouttelettes produites. On constate également une répartition . irrégulière des gouttelettes de liquide pulvérisé dans le cône de pulvérisation, avec une plus grande concentration de gouttelettes dans la zone centrale du cône .The presence of the coaxial circular channel and of the second transfer channels increases the diameter of the nozzle, and reduces its possibilities of integration into the miniaturized spray heads of the cosmetic spray devices. But on the other hand their presence seems necessary to achieve a correct spraying of liquids with low viscosity. Another difficulty results from the relatively low fluid pressure produced by the manual pumps of the cosmetic spraying devices, which further reduces the spraying capacities and tends to increase the size of the droplets produced. There is also a distribution. irregular droplets of sprayed liquid in the spray cone, with a higher concentration of droplets in the central area of the cone.
En outre, dans une fabrication en série, on constate que les qualités de pulvérisation varient considérablement en fonction des buses considérées. Cela résulte d'une trop grande sensibilité aux variations de dimensions des buses à l'intérieur des tolérances de fabrication.In addition, in mass production, it is found that the spraying qualities vary considerably depending on the nozzles considered. This results from too great sensitivity to variations in the dimensions of the nozzles within the manufacturing tolerances.
EXPOSE DE L'INVENTION Le problème proposé par la présente invention est à la fois de réduire la taille des gouttelettes pulvérisées en sortie d'une buse alimentée en liquide, d'assurer une répartition homogène des gouttelettes dans le cône de pulvérisation dans le cas de pressions de fluide relativement faibles et variables produites par les pompes manuelles des dispositifs de pulvérisation de cosmétiques, et d'obtenir ces effets avec une buse de pulvérisation de diamètre réduit.PRESENTATION OF THE INVENTION The problem proposed by the present invention is both to reduce the size of the droplets sprayed at the outlet of a nozzle supplied with liquid, to ensure a homogeneous distribution. droplets in the spray cone in the case of relatively low and variable fluid pressures produced by manual pumps of cosmetic spray devices, and to achieve these effects with a spray nozzle of reduced diameter.
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 1 ' 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. Simultanément, on évite une trop grande dispersion du cône de pulvérisation en donnant au trou axial de sortie une forme conique appropriée, convergente vers la sortie. 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. At the same time, excessive dispersion of the spray cone is avoided by giving the axial outlet hole an appropriate conical shape, converging towards the outlet. 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,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,
- une pluralité de canaux de transfert obliques injectant le liquide en rotation dans un sens de rotation dans la chambre de tourbillonnement, - les 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, les canaux de transfert sont limités chacun par une face intérieure ayant un profil concave sur la plus grande partie de sa longueur,- a plurality of oblique transfer channels injecting the liquid in rotation in a direction of rotation into the swirl chamber, - the transfer channels are each limited by an outer face of generally rectilinear profile and tangentially connecting to the peripheral wall of the swirl chamber, the transfer channels are each limited by an inner face having a concave profile over most of its length,
- le trou coaxial de sortie a une forme conique convergente vers la sortie.- the exit coaxial hole has a conical shape converging towards the exit.
Avec une telle structure de buse de pulvérisation, le diamètre total de la buse est nettement plus réduit que celui des buses à deux étages. On constate en outre 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, à système égal de génération de pression. A titre d'exemple, pour des liquides à viscosité moyenne, comprise entre 800 et 1 000 mPa.s, on a pu obtenir un diamètre moyen de gouttelettes compris entre 95 microns environ et 65 microns environ. En outre, la répartition moyenne des gouttelettes est homogène dans le cône de pulvérisation en sortie de buse . Un effet avantageux de l'invention est aussi une relative indépendance de la qualité de pulvérisation réalisée par rapport aux pressions et débits fournis par le dispositif pousseur qui introduit le liquide à l'entrée de la buse.With such a spray nozzle structure, the total diameter of the nozzle is significantly smaller than that of two-stage nozzles. We also note that the droplet sizes sprayed at the outlet of the nozzle are much more weak than those obtained by the nozzles of the prior art mentioned above. It is estimated that about 30% is saved on the size of the droplets sprayed at the outlet, with an equal pressure generation system. By way of example, for liquids with a medium viscosity of between 800 and 1000 mPa.s, it has been possible to obtain an average droplet diameter of between about 95 microns and about 65 microns. In addition, the average distribution of droplets is homogeneous in the spray cone at the nozzle outlet. An advantageous effect of the invention is also a relative independence of the quality of spraying produced with respect to the pressures and flow rates supplied by the pusher device which introduces the liquid at the inlet of the nozzle.
Un autre effet de cette structure particulière de buse selon 1 ' 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 10 % du diamètre du trou de sortie, pour des liquides dont la viscosité est comprise entre 800 et 1 000 mPa.s.Another 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 hole of 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 approximately 10% of the diameter of the outlet hole, 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.Conversely, in known spray nozzles, off-centering of the outlet hole leads to a significant deterioration of the spray.
De préférence, selon l'invention, chaque canal de transfert est alimenté par un canal d'alimentation longitudinal périphérique depuis 1 ' entrée de la buse . Selon un mode de réalisation préféré, la face intérieure à profil concave de 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 d'alimentation longitudinal périphérique correspondant 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. Pour une meilleure pulvérisation des liquides thixotropiques, on préférera éviter les pertes de charges et zones mortes à l'intérieur de la buse. Ainsi, on pourra avantageusement prévoir que la paroi externe du canal d'alimentation longitudinal périphérique se raccorde à la paroi frontale antérieure du canal de transfert correspondant par une zone arrondie régulière.Preferably, according to the invention, each transfer channel is supplied by a peripheral longitudinal supply channel from the inlet of the nozzle. According to a preferred embodiment, the inner face with a concave profile of the transfer channel is generally circular according to a radius of between one and a half and two times the radial distance DR between the corresponding peripheral longitudinal supply 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. For better spraying of thixotropic liquids, it is preferable to avoid pressure drops and dead zones inside the nozzle. Thus, it can advantageously be provided that the external wall of the peripheral longitudinal feed channel is connected to the front front wall of the corresponding transfer channel by a regular rounded area.
Selon une réalisation avantageuse, la face intérieure à profil concave de canal de transfert se raccorde au canal d'alimentation longitudinal périphérique correspondant 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 a concave profile of the transfer channel is connected to the corresponding peripheral longitudinal feed channel by a convex rounded zone. 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 canal de transfert qui se raccorde au canal d'alimentation longitudinal périphérique correspondant par une zone arrondie convexe .For the same reasons, it is also possible to prefer an external face with a generally rectilinear profile of the transfer channel which is connected to the corresponding peripheral longitudinal supply channel by a rounded convex zone.
On peut trouver avantage, pour améliorer la pulvérisation, à prévoir que la face intérieure à profil concave de canal de transfert se raccorde à la paroi périphérique de chambre de tourbillonnement par une zone de raccordement arrondie convexe . Pour une répartition moyenne régulière des gouttelettes en sortie de buse, l'angle de cône du trou coaxial de sortie est compris entre 15° et 30°, avantageusement de 20° environ.It may be advantageous, to improve the spraying, to provide that the inner face with a concave profile of the transfer channel is connected to the peripheral wall of the swirl chamber by a convex rounded connection zone. For a regular average distribution of the droplets at the outlet of the nozzle, the cone angle of the outlet coaxial hole is between 15 ° and 30 °, advantageously about 20 °.
Une meilleure régularité de répartition de gouttelettes en sortie de buse est aussi obtenue en utilisant des canaux de transfert au nombre de cinq, répartis régulièrement autour.de l'axe longitudinal de la buse. Cet effet résulte apparemment du fait que le plus grand nombre de canaux réduit la durée du régime transitoire d'établissement de pulvérisation et permet d'atteindre plus vite le régime permanent. Par rapport à une buse à trois canaux, le régime transitoire initial est réduit, et en particulier l'angle de pulvérisation en sortie de buse atteint plus vite l'angle de régime permanent. Par exemple, des- mesures ont été effectuées sur une buse connue à trois canaux et sur une buse selon l'invention à l'instant 0,0001 seconde après le début de fonctionnement : avec la buse de l'art antérieur, l'angle est de 9°, soit 25 % de l'angle en régime permanent ; avec la buse selon l'invention, l'angle est de 24°, soit 50 % de l'angle en régime permanent .A better regularity of distribution of droplets at the outlet of the nozzle is also obtained by using transfer channels five in number, distributed regularly around the longitudinal axis of the nozzle. This effect apparently results from the fact that the greater number of channels reduces the duration of the transient spraying establishment regime and makes it possible to reach the steady state more quickly. Compared to a three-channel nozzle, the initial transient regime is reduced, and in particular the spraying angle at the nozzle outlet more quickly reaches the steady-state angle. For example, measurements were made on a known nozzle with three channels and on a nozzle according to the invention at the instant 0.0001 seconds after the start of operation: with the nozzle of the prior art, the angle is 9 °, or 25% of the steady state angle; with the nozzle according to the invention, the angle is 24 °, or 50% of the angle in steady state.
L'invention prévoit un pulvérisateur de liquides, qui comprend une buse de pulvérisation telle que définie ci-dessus. Un tel pulvérisateur présente des avantages pour la pulvérisation de tous types de liquides, et il présente aussi 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. D'excellents résultats sont obtenus lorsque le pulvérisateur contient un liquide thixotropique .The invention provides a liquid sprayer, which comprises a spray nozzle as defined above. Such a sprayer has advantages for spraying all types of liquids, and it also 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 1,000 and 1,100 kg / m 3 approximately. 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:SUMMARY DESCRIPTION OF THE DRAWINGS Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, made in relation to the attached figures, among which:
- la figure 1 est une vue de côté globale en coupe longitudinale d'une buse de pulvérisation selon un mode de réalisation particulier de l'invention, comprenant un noyau central engagé dans un corps de buse femelle ;- Figure 1 is an overall side view in longitudinal section of a spray nozzle according to a particular embodiment of the invention, comprising a central core engaged in a female nozzle body;
- la figure 2 est une vue de la face postérieure de la structure de corps de buse femelle de la figure 1 ;- Figure 2 is a view of the rear face of the female nozzle body structure of Figure 1;
- la figure 3 est une coupe longitudinale diamétrale de la structure de corps de buse femelle selon le plan C-C de la figure 2 ;- Figure 3 is a diametrical longitudinal section of the female nozzle body structure along the plane C-C of Figure 2;
- la figure 4 est une vue en perspective de trois quarts arrière de la structure de corps de buse femelle ;- Figure 4 is a rear three-quarter perspective view of the female nozzle body structure;
- la figure 5 est une vue arrière partielle de la figure 2, montrant à plus grande échelle la courbure des faces des canaux ; et- Figure 5 is a partial rear view of Figure 2, showing on a larger scale the curvature of the faces of the channels; and
- la figure 6 est une vue schématique générale d'un pulvérisateur selon l'invention.- Figure 6 is a general schematic view of a sprayer according to the invention.
DESCRIPTION DES MODES DE REALISATION PREFERESDESCRIPTION OF THE PREFERRED EMBODIMENTS
Dans le mode de réalisation illustré sur les figures, une buse de pulvérisation selon' 1 'invention comprend un corps de buse 1 comportant un logement cylindrique 2 ouvert vers 1 ' arrière et obturé vers 1 ' avant par une paroi antérieure 3. Un noyau 4 ( figure 1) généralement cylindrique à face antérieure 5 pleine est engagé coaxiale ent dans le logement cylindrique 2 du corps de buse 1, venant en appui sur la face postérieure 6 de la paroi antérieure 3. La face antérieure 5 peut avantageusement être bordée par un congé 5a.In the embodiment illustrated in the figures, a spray nozzle according to ' 1' 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 core 4 (figure 1) generally cylindrical with a full front face 5 is engaged coaxially ent in the cylindrical housing 2 of the nozzle body 1, coming to bear on the rear face 6 of the front wall 3. The front face 5 can advantageously be bordered by a leave 5a .
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 cinq canaux de transfert obliques tels que les canaux 11, 12, 13, 14 et 15. Les canaux de transfert 11-15 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. Cinq canaux d'alimentation longitudinaux périphériques tels que les canaux 16, 17, 18, 19 et 20 conduisent le liquide depuis une entrée de liquide 40 et l'injectent dans un canal de transfert respectif 11-15.The spray nozzle comprises five oblique transfer channels such as channels 11, 12, 13, 14 and 15. The transfer channels 11-15 tangentially inject the liquid into the swirl chamber 7 by rotating it around the axis II, for example in the direction of rotation of the needles of a watch in FIG. 2. Five peripheral longitudinal supply channels such as channels 16, 17, 18, 19 and 20 conduct the liquid from a liquid inlet 40 and inject it into a respective transfer channel 11-15.
Les canaux de transfert 11-15 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 canaux de transfert. Cette forme est telle que représentée à l'échelle sur les figures 2, 4 et 5, auxquelles on pourra se référer pour plus de détails.The transfer channels 11-15 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 transfer channels. This shape is as shown to scale in Figures 2, 4 and 5, which may be referred to for more details.
Ainsi, sur la figure 5, le canal de transfert 11 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.Thus, in FIG. 5, the transfer channel 11 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 side closest to the longitudinal axis II. The outer face 21 has a generally rectilinear profile and is connected tangentially along the connection zone 23 to the peripheral wall 8 of the swirl chamber 7.
La face intérieure 22 du canal de transfert 11 présente un profil concave Ll sur la plus grande partie de sa longueur. 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 d'alimentation longitudinal périphérique correspondant 16 et la chambre de tourbillonnement 7. La face intérieure 22 à profil concave Ll du canal de transfert 11 peut se raccorder au ' canal d'alimentation longitudinal périphérique 16 par une zone arrondie convexe 24.The inner face 22 of the transfer channel 11 has a concave profile L1 over most of its length. The inner face 22 with concave profile L1 may be generally circular according to a radius advantageously between one and a half and two times the radial distance DR between the corresponding peripheral longitudinal feed channel 16 and the swirl chamber 7. The inner face 22 with a concave profile L1 of the transfer channel 11 can be connected to the peripheral longitudinal supply channel 16 by a convex rounded zone 24.
La face extérieure 21 à profil généralement rectiligne du canal de transfert 11 peut se raccorder au canal d'alimentation longitudinal périphérique 16 par une zone arrondie convexe 25.The external face 21 with a generally rectilinear profile of the transfer channel 11 can be connected to the peripheral longitudinal supply channel 16 by a convex rounded zone 25.
Enfin, la face intérieure 22 à profil concave Ll du canal de transfert 11 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.Finally, the inner face 22 with concave profile L1 of the transfer channel 11 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 1 ' axe longitudinal I-I selon une tolérance inférieure àThe coaxial outlet hole 10 can advantageously be centered on the longitudinal axis I-I with a tolerance of less than
10 % du diamètre du trou coaxial de sortie 10, par exemple inférieure à 40 microns environ pour un diamètre en sortie de 400 microns, de préférence inférieure à 30 microns.10% of the diameter of the outlet coaxial hole 10, for example less than approximately 40 microns for an outlet diameter of 400 microns, preferably less than 30 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. Le trou coaxial de sortie 10 selon l'invention est conique, convergent vers l'aval ou vers la sortie de la buse. L'angle de cône A du trou coaxial de sortie 10 est compris entre 15° et 30° environ, avantageusement de 20° environ.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 coaxial outlet hole 10 according to the invention is conical, converging downstream or towards the outlet of the nozzle. The cone angle A of the outlet coaxial hole 10 is between approximately 15 ° and 30 °, advantageously approximately 20 °.
Ce qui est important est que le trou coaxial de sortie 10 soit conique sur la majeure partie de sa longueur depuis l'orifice d'entrée. Autrement dit, le trou coaxial de sortie 10 peut se raccorder à la face externe de la paroi antérieure 3 par un congé ou une surface torique, sans que cela nuise aux performances de pulvérisation .What is important is that the coaxial outlet hole 10 is conical over most of its length from the inlet port. In other words, the coaxial outlet hole 10 can be connected to the external face of the anterior wall 3 by a leave or an O-ring surface, without affecting spray performance.
La section transversale des premiers canaux de transfert 11-15 peut avantageusement se réduire progressivement depuis le canal d'alimentation longitudinal périphérique vers la chambre de tourbillonnement 7. Par exemple, les faces intérieure et extérieure peuvent faire un angle B d'environ 15°. 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 11-15 can advantageously be reduced progressively from the peripheral longitudinal supply channel towards the swirl chamber 7. For example, the interior and exterior faces can make an angle B of approximately 15 °. Their anterior (in the anterior wall 3) and posterior (anterior face 5 of the core 4) faces may advantageously be parallel, to facilitate manufacture thereof.
En considérant la figure 1, on voit que la paroi externe du canal d'alimentation longitudinal périphérique 16 se raccorde à la paroi frontale antérieure du canal de transfert correspondant 11 par une zone arrondie régulière 16a. De la sorte, on améliore le cheminement du fluide en diminuant ses perturbations dans la zone en amont des canaux de transfert et de la chambre de tourbillonnement .Considering FIG. 1, it can be seen that the external wall of the peripheral longitudinal supply channel 16 is connected to the front front wall of the corresponding transfer channel 11 by a regular rounded zone 16a. In this way, the flow of the fluid is improved by reducing its disturbances in the zone upstream from the transfer channels and from the swirl chamber.
L'accélération du fluide se fait progressivement depuis l'entrée 40 de la buse jusqu'à la sortie hors du trou coaxial de sortie 10. Cela favorise la pulvérisation de tous types de liquides, en particulier des liquides thixotropiques .The acceleration of the fluid takes place gradually from the inlet 40 of the nozzle to the outlet from the coaxial outlet hole 10. This promotes the spraying of all types of liquids, in particular thixotropic liquids.
Les formes de canaux sont entièrement réalisés dans le corps de buse, le noyau 4 étant simplement cylindrique, avec éventuellement un congé 5a. On facilite ainsi la fabrication de la buse, permettant de réaliser en grande série des buses de petit diamètre pour les applications cosmétiques.The channel shapes are entirely produced in the nozzle body, the core 4 being simply cylindrical, possibly with a leave 5a. This facilitates the manufacture of the nozzle, making it possible to mass produce small diameter nozzles for cosmetic applications.
De façon particulièrement avantageuse, la forme de buse selon l'invention produit un effet dynamique de pulvérisation : en fonction de la pression, le fractionnement des gouttelettes reste satisfaisant, mais leur répartition est modifiée dans le cône de pulvérisation. Lorsque la pression est faible, les gouttelettes tendent à se concentrer au centre du cône de pulvérisation, tandis qu'aux pressions plus élevées les gouttelettes tendent à se répartir en périphérie du cône. Au cours d'une séquence de pulvérisation, sous l'action d'une force manuelle, la pression commence par des valeurs faibles, puis augmente progressivement pour diminuer ensuite jusqu'à des valeurs faibles. Il en résulte que les gouttelettes sont tout d'abord concentrées vers le centre du cône de pulvérisation, puis concentrées en périphérie et enfin concentrées à nouveau au centre, de sorte que la répartition moyenne des gouttelettes est sensiblement constante dans le cône de pulvérisation à la fin de la séquence de pulvérisation.In a particularly advantageous manner, the shape of the nozzle according to the invention produces a dynamic spraying effect: depending on the pressure, the fractionation of the droplets remains satisfactory, but their distribution is modified in the spray cone. When the pressure is low, the droplets tend to concentrate in the center of the spray cone, while at higher pressures the droplets tend to distribute themselves around the periphery of the cone. During a spraying sequence, under the action of a manual force, the pressure begins with low values, then gradually increases, then decreases to low values. The result that the droplets are first concentrated towards the center of the spray cone, then concentrated around the periphery and finally concentrated again at the center, so that the average distribution of the droplets is substantially constant in the spray cone at the end of the spray sequence.
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'au moins 30 % par rapport aux gouttelettes obtenues par les buses de pulvérisation connues.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 at least 30% smaller. compared to the droplets obtained by known spray nozzles.
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 :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:
- diamètre de chambre de tourbillonnement : 1 mm environ ;- diameter of the swirl chamber: approximately 1 mm;
- longueur de chambre de tourbillonnement : 0,40 mm environ ;- length of the swirl chamber: approximately 0.40 mm;
- diamètre extérieur de buse : 4,5 mm environ. Dans la réalisation illustrée schématiquement sur la figure 6, 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.- outside diameter of nozzle: 4.5 mm approximately. In the embodiment illustrated schematically in Figure 6, a liquid sprayer 27 comprises a container 28, a pump 29 and a spray nozzle 30 as defined above. By actuating the button 31, the pump 29 is actuated which sucks the liquid 32 from the container 28 by 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.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.
De bons résultats peuvent également être obtenus lorsque le liquide 32 présente des propriétés thixotropiques . 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. Good results can also be obtained when the liquid 32 has thixotropic properties. The present invention is not limited to the embodiments which have been explicitly described, but it includes some the various variants and generalizations contained in the field of claims below.

Claims

REVENDICATIONS
1 - Buse de pulvérisation pour la pulvérisation de liquides, comprenant :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 (5), 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 (5), and by a pierced front wall (9) a coaxial outlet hole (10),
- une pluralité de canaux de transfert (11-15) obliques injectant le liquide en rotation dans un sens de rotation dans la chambre de tourbillonnement (7), caractérisée en ce que :- a plurality of oblique transfer channels (11-15) injecting the liquid in rotation in a direction of rotation into the swirl chamber (7), characterized in that:
- les canaux de transfert (11-15) 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 transfer channels (11-15) 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 canaux de transfert (11-15) sont limités chacun par une face intérieure (22) ayant un profil concave (Ll) sur la plus grande partie de sa longueur,the transfer channels (11-15) are each limited by an inner face (22) having a concave profile (L1) over most of its length,
- le trou coaxial de sortie (10) a une forme conique convergente vers la sortie.- the outlet coaxial hole (10) has a conical shape converging towards the outlet.
2 - Buse de pulvérisation selon la revendication 1, caractérisée en ce que chaque canal de transfert (11-15) est alimenté par un canal d'alimentation longitudinal périphérique (16-20) depuis l'entrée (40) de la buse. 3 - Buse de pulvérisation selon la revendication 2, caractérisée en ce que la face intérieure (22) à profil concave (Ll) de canal de transfert (11-15) est généralement circulaire selon un rayon compris entre une fois et demie et deux fois la distance radiale (DR) entre le canal d'alimentation longitudinal périphérique correspondant (16-20) et la chambre de tourbillonnement (7) .2 - Spray nozzle according to claim 1, characterized in that each transfer channel (11-15) is supplied by a peripheral longitudinal supply channel (16-20) from the inlet (40) of the nozzle. 3 - Spray nozzle according to claim 2, characterized in that the inner face (22) with concave profile (Ll) of transfer channel (11-15) is generally circular according to a radius between one and a half and two times the radial distance (DR) between the corresponding peripheral longitudinal feed channel (16-20) and the swirl chamber (7).
4 - Buse de pulvérisation selon l'une des revendications 2 ou 3, caractérisée en ce que la face intérieure (22) à profil concave (Ll) de canal de transfert (11-15) se raccorde au canal d'alimentation longitudinal périphérique correspondant par une zone arrondie convexe (24) . 5 - Buse de pulvérisation selon l'une quelconque des revendications 2 à 4, caractérisée en ce que la face extérieure4 - Spray nozzle according to one of claims 2 or 3, characterized in that the inner face (22) with concave profile (Ll) of transfer channel (11-15) is connected to the corresponding peripheral longitudinal supply channel by a convex rounded area (24). 5 - Spray nozzle according to any one of claims 2 to 4, characterized in that the outer face
(21) à profil généralement rectiligne de canal de transfert (11-15) se raccorde au canal d'alimentation longitudinal périphérique correspondant (16-20) par une zone arrondie convexe (25) .(21) with a generally rectilinear transfer channel profile (11-15) is connected to the corresponding peripheral longitudinal feed channel (16-20) by a convex rounded zone (25).
6 - Buse de pulvérisation selon 1 ' une quelconque des revendications 2 à 5, caractérisée en ce que la paroi externe du canal d'alimentation longitudinal périphérique (16-20) se raccorde à la paroi frontale antérieure du canal de transfert correspondant (11-15) par une zone arrondie régulière (16a) .6 - Spray nozzle according to any one of claims 2 to 5, characterized in that the external wall of the peripheral longitudinal supply channel (16-20) is connected to the front front wall of the corresponding transfer channel (11- 15) by a regular rounded area (16a).
7 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la face intérieure7 - Spray nozzle according to any one of claims 1 to 6, characterized in that the inner face
(22) à profil concave (Ll) de canal de transfert (11-15) 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 transfer channel (11-15) is connected to the peripheral wall (8) of the swirl chamber (7) by a rounded convex connection zone (26).
8 - Buse de pulvérisation selon la revendication 7, caractérisée en ce que le rayon de courbure de la zone de raccordement (26) convexe est compris entre 50 microns et 80 microns environ. 9 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le trou coaxial de sortie (10) est centré sur l'axe longitudinal (I-I) selon une tolérance inférieure à 10 % du diamètre du trou, avantageusement inférieure à 40 microns environ, de préférence inférieure à 30 microns.8 - Spray nozzle according to claim 7, characterized in that the radius of curvature of the convex connection zone (26) is between approximately 50 microns and 80 microns. 9 - Spray nozzle according to any one of claims 1 to 8, characterized in that the coaxial outlet hole (10) is centered on the longitudinal axis (II) according to a tolerance of less than 10% of the diameter of the hole, advantageously less than about 40 microns, preferably less than 30 microns.
10 - Buse de pulvérisation selon la revendication 9, 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. 11 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 10, caractérisée en ce que l'angle de cône du trou coaxial de sortie (10) est compris entre 15° et 30°, avantageusement de 20° environ.10 - Spray nozzle according to claim 9, 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 °. 11 - Spray nozzle according to any one of claims 1 to 10, characterized in that the cone angle of the coaxial outlet hole (10) is between 15 ° and 30 °, preferably about 20 °.
12 - Buse de pulvérisation selon l'une quelconque des revendications 1 à 11, caractérisée en ce que les canaux de transfert (11-15) sont au nombre de cinq, répartis régulièrement autour de 1 ' axe longitudinal de la buse . 13 - Pulvérisateur de liquide (27) , comprenant une buse de pulvérisation (30) selon l'une quelconque des revendications 1 à 12.12 - Spray nozzle according to any one of claims 1 to 11, characterized in that the transfer channels (11-15) are five in number, distributed regularly around one longitudinal axis of the nozzle. 13 - Liquid sprayer (27), comprising a spray nozzle (30) according to any one of claims 1 to 12.
14 - Pulvérisateur (27) selon la revendication 13, 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.14 - Sprayer (27) according to claim 13, 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.
15 - Pulvérisateur (27) selon l'une des revendications 13 ou 14, caractérisé en ce qu'il contient un liquide thixotropique . 15 - Sprayer (27) according to one of claims 13 or 14, characterized in that it contains a thixotropic liquid.
EP20030700410 2002-01-25 2003-01-24 Atomisation nozzle with reduced diameter Withdrawn EP1467818A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0201116 2002-01-25
FR0201116A FR2835203B1 (en) 2002-01-25 2002-01-25 SPRAY NOZZLE WITH REDUCED DIAMETER
PCT/IB2003/000188 WO2003061839A1 (en) 2002-01-25 2003-01-24 Atomisation nozzle with reduced diameter

Publications (1)

Publication Number Publication Date
EP1467818A1 true EP1467818A1 (en) 2004-10-20

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EP20030700410 Withdrawn EP1467818A1 (en) 2002-01-25 2003-01-24 Atomisation nozzle with reduced diameter

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EP (1) EP1467818A1 (en)
FR (1) FR2835203B1 (en)
WO (1) WO2003061839A1 (en)

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FR2904573B1 (en) * 2006-08-04 2008-12-05 Rexam Dispensing Systems Sas SPRAY NOZZLE, DISPENSING DEVICE COMPRISING SUCH A NOZZLE, DISPENSER COMPRISING SUCH A DISPENSING ORGAN AND USE OF SUCH A NOZZLE.
FR2909908B1 (en) 2006-12-15 2009-02-27 Rexam Dispensing Systems Sas SPRAY NOZZLE, DISPENSING MEMBER COMPRISING SUCH A NOZZLE, DISPENSER COMPRISING SUCH AN ORGAN AND USE OF SUCH A NOZZLE.
EP2570190A1 (en) * 2011-09-15 2013-03-20 Braun GmbH Spray nozzle for dispensing a fluid and sprayer comprising such a spray nozzle
EP2570110B1 (en) * 2011-09-15 2017-05-03 Noxell Corporation Aerosol hairspray product for styling and/or shaping hair
CN104780895A (en) 2013-06-28 2015-07-15 宝洁公司 Aerosol hairspray product comprising a spraying device
CN103464318B (en) * 2013-09-26 2015-12-02 无锡美灵数码科技有限公司 Fine nozzle
AR101397A1 (en) * 2014-08-06 2016-12-14 Johnson & Son Inc S C INSERT FOR SPRAYERS
EP3302408B1 (en) 2015-06-01 2019-08-14 The Procter and Gamble Company Aerosol hairspray product comprising a spraying device
US20210170429A1 (en) * 2016-01-27 2021-06-10 Dlhbowles, Inc. Improved swirl nozzle assembly with high efficiency mechanical break up to generate mist sprays of uniform small droplets
FR3050125B1 (en) * 2016-04-14 2021-12-17 Albea Le Treport SPRAY NOZZLE, ESPECIALLY FOR A PRESSURE PRODUCT DISTRIBUTION SYSTEM EQUIPPED WITH A PUSH BUTTON, AND DISTRIBUTION SYSTEM INCLUDING SUCH A NOZZLE
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Publication number Publication date
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FR2835203B1 (en) 2004-04-09
WO2003061839A1 (en) 2003-07-31

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