DK151045B - SUSPENSION VALUES FOR DELIVERING A UNDERPRESSED LIQUID BASKET - Google Patents

Description

! 151045

ISLAND

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a nebulizer nozzle for dispensing a misty liquid in the overpressure form, said nozzle comprising at least a first and second portions adjacent to each other with end faces transverse to the axis (MA) through outlet port in the first portion, and flow paths are formed between the portions which have a central outlet chamber having several relative to the axis (MA), substantially tangentially therein, opening channels therein from at least one surrounding ring chamber 10, wherein the channels generally perpendicular to these, other, axially extending channels through which the pressurized liquid can be directed outwardly flow to the flow paths.

From the specification of French Patent No. 2,325,434, a nebulizer nozzle of this kind is known, with a syringe head containing ring ducts and a central vortex chamber for the finest possible splitting of the product to be atomized. However, this spray head has several drawbacks, especially that the swirl chamber allows an uncontrolled flow of the product. In addition, there are no devices for increasing the flow rate of the product towards the outlet. Therefore, this spray head is not suitable for dispensing finely atomized products which are stored under only relatively low pressure and without propellant gas.

Further, from the disclosure of U.S. Patent No. 3,652,018, there is known a nebulizer nozzle which is used for the mechanical breaking of a liquid stream to form a mist of fine droplets. This known nozzle is easier to manufacture than a nozzle with similar trench known from the specification of U.S. Patent No. 3,083,917. The supply channels at the nozzle of U.S. Patent No. 3,652,018 are spaced apart by separating elements, e.g. deflection plates, and the supply ducts exit from a common outer ring chamber and are terminated in a common central outlet opening.

35 2 151045 o

An arrangement comprising four supply ducts projecting from an outer annulus tangentially into the wall of a central cylindrical mixing chamber to effect an improved atomization of the liquid material is also known from U.S. Patent No. 1,594,641.

However, these known nebulizer nozzles do not fully satisfy the requirements that must be met by a number of contemporary nebulizing products, e.g. hair lacquer, deodorants, air fresheners or insecticides. Thus, the atomized mist must contain droplets of between 5 and 100 µm, e.g. is particularly important in the case of hair varnish, in order to obtain a rapid evaporation so that the hair does not become entangled when the hairstyle is put in place after application.

15 Air fresheners and insecticides may evaporate rapidly or escape into the air so as not to damage furniture, walls, wallpaper or parquet floors. While obtaining a very fine particle or droplet size, the nebulized product must also possess a sufficiently strong collisional force in the case of hair lacquer, which must not only lie on top of the hair but also penetrate in this, ensuring an airy hairstyle. In the case of air fresheners and insecticides, the nebulized mist must be able to penetrate the airspace designated for treatment as widely as possible.

Commercially available nebulizer nozzles, e.g. that the species used in aerosol cans or pump atomizers requires a pressure of at least 6 ato to produce fogs of the desired quality when used without a liquid component, or about 3 ato if such component is present, as a propellant consisting of a gas converted to liquid, as is known, is pressure-relieved in contact with the ambient air and then decisively contributes to the formation of fine droplets in the atomized mist.

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Preferably, a nozzle designed in accordance with the invention is to be used in connection with a pressure atomization without gas-converted gas and without an air pump and without other propellants (ie in so-called 5 propellant-free dispensing assemblies) where a maximum pressure of 2.4 is sought. Ato or even less pressure, depending on the storage time, it is sought to construct the nozzle in such a way that, at a relatively low pressure, it is able to provide the necessary fog quality while being simple and therefore economically prepared, further provided that if liquid-converted gas is present in the product and the pressures are correspondingly higher, a new, substantially increased fineness of the particles 15 in the nozzle according to the invention can be obtained. provided, atomized fog.

This is achieved according to the invention with a nebulizer nozzle of the kind mentioned initially, which is characterized by the characterizing part of claim 1. Specific embodiments of the nebulizer nozzle according to the invention are set forth in the subclaims.

The invention will now be explained in more detail with reference to the drawing, in which: 1 shows a longitudinal section through a nebulizer head 25 with a two-part nebulizer nozzle according to the invention; FIG. 2 is a cross-section through a nozzle core forming a first part of an embodiment of the nebulizer nozzle according to the invention along line II-II of FIG. 1 and on a larger scale (the section shown in figure 1 is indicated in figure 2 by the arrows I-I in figure 2); 3 is a longitudinal section through the embodiment of FIG. 2 shows the nozzles along line III-III in FIG. 2, FIG. 4 is a longitudinal section through a nozzle housing constituting a first part of an embodiment of the nebulizer nozzle which conforms to that of FIG. 2 and 3 show the nozzles,

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FIG. 5 is a longitudinal section through a central region of a nebulizer nozzle composed of those of FIG. 3 and 4 on a larger scale; FIG. 6 is a cross-section through an embodiment similar to that of FIG. 2-5, but provided with six supply channels; FIG. 7 is a cross-section through a further embodiment of a nozzle core provided with three turbulence stages; 8 is a longitudinal section through a portion of the embodiment of FIG. 7; FIG. 9 is a cross-section through a die core similar to that of FIG. 2, but provided with additional supply channels for introducing another medium; FIG. 10 is a longitudinal section through a nebulizer nozzle provided with a nozzle core according to FIG. 9 and with a supply valve and supply channels for another medium; FIG. 11 is a front elevational view, partly in section, of one embodiment of an atomizer nozzle provided with a nozzle outlet, an annulus and a control valve as shown in FIG. 10, FIG. 12 shows a nebulizer nozzle similar to that of FIG. 11 but provided with simple suction openings for another medium, and FIG. 13 is an axial longitudinal section through another embodiment of an atomizer head containing an atomizer nozzle according to the invention.

In FIG. is shown in longitudinal section an actuation head 30 which has in its side wall 30a a recess 31, in which is arranged a preferred embodiment of the atomizer nozzle according to the invention. The nebulizer nozzle consists of a first portion in the form of a cup-shaped nozzle housing 33 and a second portion in the form of a nozzle core 32 which is accommodated in a recess 33a formed in the inner end wall of the nozzle housing 33.

The nozzle core 32 carries recesses formed in it

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the front end surface 32a which is in sealing contact with the bottom 33b of the recess 33a and faces an outlet opening 41, as well as recesses formed in the peripheral wall 32b of the nozzle core which are in close contact with the recess 33a1's sidewall 5 33c, which recesses form the inner nozzle cavity which comprises annular chambers and ducts when the nozzle is made by joining the nozzle core 32 and the nozzle housing (nozzle cap) 33.

The recesses mentioned are particularly shown in the embodiment of FIG.

2 and 3 depict the nozzles 32.

The actuation head 30 carries on its underside a sleeve or neck portion 34 which is open downwards and wherein the valve shaft from an aerosol can be mounted in known manner.

The interior of the sleeve 34 forms a main supply channel 27, from whose upper end region extends four supply channels 35 in the actuating head 30, formed as longitudinal grooves in the peripheral wall 32b of the nozzle core 32 and extending in the axial direction relative to the central axis of the nozzle and terminating perpendicular to the grooves. in the end surface 32a forming the turbulence system of the nozzle. The turbulence system comprises as shown in FIG. 2, four supply channels 36 connected at their supply openings 36a to the front end of one of the axial supply channels 35, all of which extend skewed to the center axis of the nozzle in a plane which intersects this axis at a right angle; and which tangentially opens into a common first outer annular chamber 37, wherein their orifices or outlet openings 36b are symmetrically spaced about the outer peripheral wall 37a of the annular chamber 37 (Fig. 2) and together with said peripheral wall the guide rim 30 36c forms.

From the annulus 37, four channels 38 of the next turbulence stage extend inwardly and into the nozzle of a second, inner annulus 39 which surrounds a pin-like deflection projection 40 which protrudes from the plane determined by the bottom surfaces 36d of the supply ducts 36 (FIG. 3) up to substantially near the inlet to the nozzle outlet opening 41.

35

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As shown in FIG. 3, the annular chambers and channels are hermetically or at least fluid tightly covered by the bottom surface 33b of recess 33a. Thus, a pressurized liquid flowing through the inner cavity of the nozzle can only move through the channels and annular chambers in the direction towards the nozzle outlet opening 41.

The best conical design of the supply channels 36 is obtained if a tangent is drawn from the channel side 35a to the periphery of the annular chamber 27 and at the same time a straight line from the channel side 35b through the intersection point 37a between the tangent and the annular chamber 37. It has been found advantageous to choose the width of the annulus 37 in such a manner that it is equal to the width of the orifices 36b of the supply ducts 36 of the annulus 37. This structure allows the fluid flowing under pressure from the supply ducts 35 to accelerate due to the narrowing of the supply ducts 36 towards them. orifice in the annulus 37, as well as providing a centrifugal force component in the liquid by the pivotal movement to which the liquid is subjected in the annulus 37. In addition, a suction effect in the annulus 37 is produced at each orifice 36b in a supply channel 36. The optimal placement of the rim 38d in the supply opening 38a for the inner tantial ducts 38 in the second turbulence stage ridge by drawing a tangent to the periphery of the second ring chamber 39 from the first contact point on the rim 36c 25 between the straight line 35B-37A and the annular wall 37a, while obtaining a straight line the optimum width of the supply openings 38a for the inner channels 38 from the point 39A where this tangent touches the second ring 30 chamber 39 to the point 35A on the lateral edge 35a of the supply channel 35. It has been found advantageous to allow the width of the annular chamber 39 to be such that it is equal to the sum of the width of the orifices of the inner tangential channels 38 of the annular chamber, whereby the diameter of the pin-like projection 40 is likewise measured.

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7 151045 voted. The height of the outer tangential supply channels 36 in the axial direction remains unchanged, while the inner channels 38, on the other hand, not only narrow in the lateral direction but also in height from their supply openings 38a between the two axial wall edges 38c and 38d and up to their orifices 38b in the annulus 39. This constriction is not continuous, but is interrupted by a deflection projection 23 which forms an obstacle which generates a mechanical break-up and turbulence formation already during the acceleration of the liquid (Figs. 2 and 3). The circumferential rim around the front face of the projection 40, preferably having a recess 40a (Fig. 5 also leads to turbulence in the liquid flowing through the inner channels 38. A further tubular formation is provided by an annular bead 42 disposed on the inside of the nozzle housing. 33 around the nozzle outlet opening 41 (Fig. 4).

In a nebulizer nozzle according to the invention, a pressurized fluid is accelerated, rotated and swirled in a controlled manner, leading to the best possible utilization of the existing radiating power. The volume of the main supply channel 27 is relatively large compared to the axial and tangential channels connected to the main supply channel 27, respectively.

On the other hand, its oversized volume relative to the subsequent channels is necessary in order for the existing compressive force applied to the liquid to be unrestricted to act on the channels 35, while the axial and tangential channels remain free even when a liquid which dries quickly as a result of a slow evaporation of a relatively large amount of liquid is stored in the main supply duct 27.

The spraying performance of the nebulizer nozzle according to the invention can be adapted to a particular viscosity of the liquid by appropriately changing the cross-section of the axial channels 35 and 35 as well as the cross-section of the compartments 36, 37, 38 and 39 of the die.

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8 151045 sens inside. Of course, a higher viscosity of the liquid requires a larger cross-sectional area than a low viscosity liquid.

The size of the droplets in the fog can be adjusted by changing the distance between the pin-like projection 40 5 and a ring rib 42 on the nozzle housing 33. The less distance, the smaller the droplet size. Of course, the distance must not be made too small, as such would reduce the rate of radiation and therefore increase the angle of radiation of the atomized mist, unless such effects are desired for a particular product. Also, the angle of radiation of the fog depends on the length of the nozzle outlet opening 41 in the nozzle housing 33.

The longer the outlet opening 41, the smaller this angle is.

In FIG. 4 and 5 there is shown a further advantageous embodiment of the nebulizer nozzle according to the invention. The nozzle core 32 is similar to that of FIG. 1-3, except that in the second annular chamber 39, a turbulence chamber 45 is formed which is formed by the projection 40 carrying an axially projecting annular flange 44. The indentation 40 formed within the flange of the protrusion 20 the front end surface restricts turbulence chamber 45 inwardly, while the bottom surface 33b of recess 33a in recesses 33a of nozzle housing 33 confines this outwardly, wherein annular bead 42, whose outer diameter is slightly smaller than the inner diameter of annular flange 44, extends slightly 25 into turbulence chamber 45 Thus, a ring gap 46 is provided between the ring flange 44 and the ring bead 42, which gives rise to a significant increase in the turbulence of the turbulence chamber 45, especially if the upper edge of the ring bead 42 projects to the plane of the upper edge of the ring flange 44 or beyond this plane and into the interior of the turbulence chamber 45 (Fig. 5).

In the embodiment shown in FIG. 4, the nozzle housing 33 on its inner edge surrounding the recess 33a is provided with an annular flange or socket 28 which is so close to

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against a corresponding recess 28a in the actuating head 30, that the nozzle cannot be ejected from the actuating head 30, even at a fluid under very high pressure.

FIG. 6 shows a further embodiment of a nozzle core 32 having six supply channels 35 leading 5 to six supply channels 36 and ending in a common ring chamber 37, from which six tangential channels 38 lead to a common inner ring chamber 39 limited by the pin-like deflection projection 40.

FIG. 7 shows a further embodiment in which the atomizer nozzle according to the invention may be provided not only with two, but also with three or more successive turbulence steps, the nozzle core 6, in addition to the channels and annulus 36, 37, 38 and 39, may also contain tangential channels 48, and annulus 49 may be provided with a turbulence chamber 45 above the projection 40. Of course, the number of successive turbulence stages may also depend on the available fluid pressure so that the fluid flow is not unnecessarily slowed down by a significant friction. The higher the pressure to which the liquid is subjected, the more turbulent steps may be provided. In the embodiment shown in FIG. 7, the height of the supply channels and passageways is not reduced tapered, but incrementally towards the turbulence chamber 45. In this case, each step forms an obstacle causing vortex formation, and the narrowing of the passageways is a factor which gives rise to an acceleration of fluid flow (Fig. 8).

FIG. 9 shows yet another embodiment of a nozzle core 32 in which, in addition to the tangential channels 36 and 38, it is also provided with supply channels 29, whose supply openings 29a are not positioned along the periphery of the nozzle core 32 but towards the center of the core, and which is provided with passageways 26 extending axially from the front face 33c of the nozzle housing 33 and through the nozzle core. The supply channels 29 are arranged in such a way that they open into:

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The ring chamber 37 is tangentially to the outer side wall of the chamber at regions which give rise to suction between the orifices 36b for each pair of adjacent tangential channels 36.

5 In order to produce a further suction effect in the supply channels 29, the outer wall of the annular chamber 37 is not completely circular, but narrows just before the orifices 29b in the supply channels 29 seen in the flow direction. The liquid flowing in from a supply channel 36, which has already been accelerated, is then driven into the subsequent narrowing of the annulus 37 where it is again accelerated to produce a suction as it flows past the mouth 29b. of a passageway 29, which gives rise to an increase in power, 15 this opening 29b being located slightly behind the supply area 38a of a passageway 38, i.e. forward in the direction of flow, through which passage 38 the liquid flows to the nozzle outlet 41. Supply channels 29 are provided for sucking in another medium, e.g. air, and for the purpose of mixing this medium with the liquid flowing through the interior of the nozzle.

Since a nebulizer nozzle designed in accordance with the invention is arranged to be preferably used for dispensing a product which does not contain gas, and in particular not a propellant gas, it is if a foam forming product is to be dispensed, e.g. shaving foam, in foam form, which often requires the presence of a gaseous medium to form the foam, is also necessary to introduce a gas phase to the shaving foam liquid phase. This can be achieved if the basic liquid, while flowing through the outer tangential ducts 36, the annular chamber 37 and the inner tangential ducts 38, is arranged to draw air through the openings 29a of the supply ducts 29, the air being then the shaving foam forms when mixed with the liquid (fig.

35 9-12).

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U 151045

While in a gas-free alternative to aerosol cans, it is also possible to add oil in addition to the foam-forming emulsions, which, however, also necessitates the presence of a gaseous medium in order to appear as a dust cloud or mist after the discharge from a nebulizer nozzle. suctioning this gaseous medium (air) through the supply ducts 29 by means of the nebulizer nozzle of the invention. The cross-sectional area of the supply ducts 29 depends on the desired amount of 10 air required for mixing, and thus the amount of air must be adjusted from time to time. FIG. 11 and 12 show a nebulizer nozzle comprising a nebulizer housing 33 and a nozzle core 32 disposed in the housing, in which four openings 29a through which another medium can be sucked in via the 16 supply channels 29 are interconnected via the passage 26a and an annular channel 26b, which in FIG. 11 is shown in broken lines, which open into the nozzle housing 33 and are connected to a supply valve 22, by means of which the amount of the second suction medium can be controlled. In addition to a gaseous medium, other liquid or gaseous media, e.g. liquids or powders, which are described in more detail below.

FIG. 13 shows a longitudinal section through an actuating head in which another suitable embodiment of the atomizer nozzle according to the invention is arranged. In this case, the various channels, passageways and annular chambers are formed or eroded into an inner nozzle body 52 on the front face 52a and a peripheral wall 52b of this body 30 and covered by a nozzle housing of the embodiment shown in FIG. 4. The nozzle body 52 is preferably molded into one with the actuating head 50 and protrudes from the bottom 51b of the recess 51a in the sidewall 51 to such a height as to leave sufficient clearance above and around the nozzle body to obtain a firm, tight placement.

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12 of the nozzle housing 53 in the side wall 51 of the actuating head 50.

Such an embodiment is only possible if the diameter of the nozzle body 52 allows the provision of four axial supply channels 35 by injection molding technique, i.e., that if the diameter is too large, the channels 35 will be too long. Since the channels 35 must have a very small cross-sectional area, corresponding to a diameter of between 0.3 and 0.6 mm, depending on the viscosity of the product, the channels must be kept as short as possible. Tests have shown that the most convenient upper limit for the overall diameter of the nozzle body 52 is about 16 mm in this embodiment. If the diameter is to be larger for any reason, it is advisable to select the one shown in FIG. 1. The main supply channel 54 has a truncated channel portion 56 at the inner end wall 52c of the nozzle body 52 and a residual narrowed channel portion 57 which leads further into the activation head 50. In addition, the angle β between the blind end 57a of the narrowed channel portion 57 and the center axis of the nozzle must be flattened than the corresponding angle α, 20 formed between the center axis and the blind end 56a of the truncated channel portion 56. These mutually disposed blind ends 56a and 57a serve as deflection or damping surfaces for the fluid flowing in the main supply channel 54, and which are thrown back by these deflecting surfaces with a more or less strong pressure in the axial supply ducts 35. If the main supply duct 54 had been cylindrical, a thrusting pressure would occur at the blind end of the duct, which would throw the liquid back under a higher pressure via the upper supply channels 35 than via the lower supply channels 35. According to the invention this is avoided as the throwing surface 56a projects into the area of the main supply channel 54 above the lower channels 35, and the angle of inclination and surface of the throwing surface is selected in such a way that the return pressure formed in the sub-channels

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lying channels 35 are identical to the pressure in the upper channels 35. If the four channels 35 have an uneven pressure distribution, the emitted fog will be asymmetrical. Of the four channels 35, only the two located in the section plane are shown.

The nozzle of the invention eliminates the use of a pump which not only requires repeated pressure to dispense the product, but also pumps ambient air and thus oxygen into the product container, which naturally results in undesirable oxidation of the product.

In order to illustrate the usefulness of a nebulizer nozzle according to the invention, it should be mentioned that laboratory experiments have shown that it is possible to save up to 75% of the propellant gas in aerosol cans by means of a nozzle according to the invention.

In summary, the advantages of a nebulizer nozzle according to the invention can be expressed in the following points; (a) The nebulizer nozzle of the invention is capable of radiating a liquid which is only under a purely mechanical pressure of about 2 ato with the same fog quality achieved by the commercially available nebulizer nozzles which are merely works at a pressure of 6 ato.

j (b) For aerosol cans, this means that the propellant no longer has to serve as both emission energy 25 and radiation factor due to the pressure drop in the ambient air, but must now only provide a pressure sufficient to fully apply the mechanical breaking properties of the nebulizer nozzle of the invention.

(C) This again means that it is no longer necessary to use a propellant mixture, e.g. Freon 11 and Freon 12, which have heretofore been necessary to produce a sufficiently large amount of gas serving as a radiating factor, and partly to change the emission pressure by different amounts of some component of the gas.

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The mixture, due to the various boiling points of the mixture contained in the mixture, uses only the propellant gas having the lowest boiling point, and only in such an amount that an excess pressure of about 2 ato is obtained in the aerosol can.

(d) Experiments have shown that e.g. in the case of hair varnish, only 19% Freon 12 must be filled, corresponding to a pressure of 1.7 ato on the aerosol nozzle, when using a pre-spray nozzle according to the invention, where it was previously necessary to use 77% gas mixture of Freon 11 and 12 corresponding to a pressure of 3.8 ato with the aim of obtaining similar radiation qualities. The atomizer nozzle according to the invention also operates at a pressure of 1.7 ato or even 15 depending on the required droplet size, down to 0.8 ato if this pressure is produced by a propellant gas. This relationship can be explained by the fact that when the gas has fulfilled its mission as a source of emission energy, the propellant is relaxed, although it also only occurs to a lesser extent 20 in contact with the ambient air, and thus as the emission factor compensates for the above-mentioned down to 2 ato. lack of pressure proportion.

Furthermore, tests have shown that due to the mechanical breaking up properties of the nebulizer nozzle according to the invention, liquids forced through the nozzle under a high pressure could be caused to evaporate as a result of the frictional heat generated.

Claims (17)

A nebulizer nozzle for dispensing a pressurized mist in liquid form, said nozzle comprising at least a first (33) and a second portion (32) which are opposed to each other with end faces transverse to the axis (MA). ) through an outlet opening (41) in the first portion (33) and between the portions (32, 33), flow paths (35 ^ 36, 37, 38, 39) having a central outlet chamber (45) having several relative to the axis (MA), substantially tangentially opening therein (36, 38) therefrom from at least one surrounding annular chamber (37, 39), whereas in the channels (36) substantially perpendicular thereto, other axially extending 15 channels (35) through which the pressurized liquid (139) can be routed from the outside to the flow paths, characterized in that a pin-like deflection projection (40) is arranged centrally in the outlet chamber (45) opposite the outlet opening (41) and extends almost 20 to this, and / or that at least one of the tangents can a deflection projection (23) is provided (36). Spray nozzle according to claim 1, characterized in that the first part (33) with the outlet opening (41) is formed as a cup-shaped housing, in which the second part 25 (32) is inserted as a plug. A nebulizer nozzle according to claim 1, which has an outer (37) and an inner annulus (39), characterized in that the outer annulus (37) with tangentially exterior supply channels (36) 30 serves to supply the liquid to the interior. r.tinuc chamber (39) leading tangential channels (38). Spray nozzle according to claim 1 or 3, characterized in that each channel (36) leading tangentially to the outer annular chamber (37) opens a short distance 35 upstream of an inlet opening (38a) to a channel leading from the same annular chamber. Ο 1β 151045 lo Spray nozzle according to one of the preceding claims, characterized in that the cross-section of the tangential channels (36, 38) decreases in the flow direction at least in their outlet areas (36b, 38b). Spray nozzle according to claim 5, characterized in that the cross-section of the tangential channels (36, 38) decreases continuously from the inlet openings (36a, 38a) of the channels to their outlet areas (36b, 38b). Spray nozzle according to claim 1 or 3, characterized in that the outer ring chamber (37) has a larger cross-section than the inner ring chamber (39). Nebulizer nozzle according to claims 1-7, characterized in that the orifice cross-section of each tangential channel (36, 38) at the orifice (36b, 38b) of a ring chamber (37, 39) is at most a third of the cross-section of the annular chamber ( 37, 39). Nebulizer nozzle according to claims 1-8, characterized in that the tangential channels (36, 38), the annular chambers (37, 39) and the outlet chamber (45) are formed as 20 recesses in the front of the second portion (32) formed as a plug. ). Spray nozzle according to claim 9, wherein there are deflection projections (23} in several tangential channels (36), characterized in that the deflection projections 25 or projections (23) are formed as steps at the bottom of said recesses). Spray nozzle according to claims 1-9, characterized in that the deflection projections (23) are in the region of the inlet opening and / or in a tangent 30 channel (38) entrance orifice respectively of a ring chamber (39). Spray nozzle according to one of the preceding claims, characterized in that a collar-like ring rib (42) surrounding the outlet opening (41) extends 35 towards the outlet chamber (45). i7 151045 O. Spray nozzle according to one of the preceding claims, characterized in that the axial distance between the front of the pin-like deflection projection (40) and the entrance to the outlet opening (41) is at most 0.1 mm. Spray nozzle according to one of claims 1-13, characterized in that the pin-like deflection projection (40) has a central recess (40a). A nebulizer nozzle according to claim 14, characterized in that the axial distance between the end face of the pin-like deflection projection (40) and the end edge of the annular rib (42) is at most 0.05 mm. A nebulizer nozzle according to one of the preceding claims, characterized in that the nozzle has supply channels (29) for another medium, which channels for running substantially tangentially from the outside to the outer ring chamber (37). Nebulizer nozzle according to claim 16, characterized in that the annulus (37) narrows so that the flow direction 20 before the mouth of each of the guide ducts (29) is located in the suction area caused by the constriction.