FI64331C - SPRAYMUNSTYCKE FOER DISTRIBUERING AV EN UNDER OEVERTRYCK STAOENDE VAETSKA I FORM AV EN DIMMA - Google Patents

Description

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Canada (CA) 288722 Proven-Styrkt (71) (72) Winfried Jean Werding, 77, av. du General Guisan, 1009 Pully,

The present invention relates to a spray nozzle for the distribution of a pressurized liquid in the form of a mist - The present invention relates to a spray nozzle for the distribution of a pressurized liquid in the form of a mist - Gpraymunstycke for distribution in the form of a mist in the form of a mist for dispensing in the form of a mist consisting of at least two parts transverse to the axis of the orifice in the second part, forming an axially symmetrical flow path between these parts with a nozzle chamber (45) in the middle and a plurality of substantially radially terminating nozzle chambers ducts passing through the mio, wherein the ducts still have ducts substantially rectangularly connected from the outside, through which the pressurized fluid is supplied to the flow path system from the outside.

A spray nozzle of the type initially described is described in U.S. Patent No. 3,652,018 and is used to mechanically "disintegrate" a liquid stream to form a spray of small droplets. This known nozzle is easier to manufacture than a nozzle which is similar in basic features and which is described in U.S. Pat. No. 3,083,917. The feed channels of a nozzle known from the former U.S. patent are separated by separating means such as spacers and start from a common outer n 2 64331 from the annular chamber and terminate in a common central outlet.

The arrangement of four supply channels, which feed channels start from the outer annular chamber and open tangentially to the wall of the central cylindrical mixing chamber to provide fluidized spraying of the liquid, has already been disclosed in U.S. Patent No. 1,594,641.

However, these known spray nozzles do not fully meet the requirements for many slippery products, such as varnishes, deodorants, air fresheners, and insecticides. In this case, their spray particle size must be 5 to 10, for example in the case of hairspray, in order to achieve rapid evaporation, so that tangling of the hair extensions is avoided when the user claps them in order after spraying. Air fresheners and insecticides must evaporate quickly or float in the air so that they do not stain furniture, walls, carpets and parquet floors. Despite the very fine particle size, the annoyed product must also have a sufficiently strong impact force in the case of hairsprays so that the latter will not only remain on the surface of the hair, but will also penetrate between the hair, which ensures that the hair stays in place well. Air freshener, in the case of marshes and insecticides, spray mist must penetrate as far as possible into the treated airspace.

Commercially available spray nozzles suitable for aerosol canisters or pump nebulizers require at least 6 atmospheric pressures to provide a spray mist of the above grade when used without a liquefied gas component or require about 3 atmospheric pressures when such a component is present because, as is known, the pressure of the propellant formed by the liquefied gas decreases in contact with the air and thus decisively influences the formation of a spray mist of fine particle size. (Hereinafter, the abbreviated term "cross-section" is used instead of the term "cross-sectional area".

64331

However, since the spray nozzle of the present invention is preferably available for spraying without liquefied gas, without an air pump and without other propellants (i.e., propellant-free dispensers), however, a maximum atmospheric pressure of 2.4 atmospheres must be used, sometimes even lower, that it is able to provide the required mist quality at a relatively low pressure and, on the other hand, is simple and inexpensive to manufacture, while being intended if the liquefiable gas is present in the product and the pressures are correspondingly higher, significantly increasing the fineness of hitherto unknown spray mist particles.

The above-mentioned object is achieved by a spray nozzle according to the invention, characterized in that in the middle of the nozzle chamber opposite the nozzle opening there is a pin-like projection extending in the vicinity of the nozzle opening and / or a deflection projection arranged in at least one channel.

Preferably, the deflection projection is formed by steps.

In a preferred embodiment of the spray nozzle, each channel with a step has a larger diameter in front of the step than behind it.

The deflection projection may be located in the area of the channel inlet and / or outlet or in the annular chamber.

Suitably, the axial distance of the ends of the pin-like projections from the nozzle opening is at most 0.1 mm. Alternatively, the distance between the front end of said protrusion and the inlet edge of the nozzle outlet is at most 0.05 mm.

The details of the spray nozzle according to the invention will be explained in the following description of preferred embodiments of the invention with reference to the accompanying drawings, in which:

Figure 1 shows a section of a nozzle according to the invention.

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Figure 2 shows an enlarged axial section of the nozzle.

Figure 3 shows the body according to Figures 1 and 2 from the central part.

Figure 4 shows a cross-section of an insert body with six feed channels.

Figure 5 shows a cross-section of a nozzle insert according to yet another embodiment with three stages of a vortex space.

Figure 6 shows an axial section of the nozzle insert shown in Figure 5.

Figure 7 is a partial longitudinal sectional view of a spray device with a spray nozzle.

In the side wall 30a of the operating end 30 of the dispenser shown in longitudinal section in Fig. 1, there is a recess 31 into which a spray nozzle according to another embodiment is formed, which is formed by a nozzle body 33 and an insert 32 fitted in a recess 33a in the inner end of the nozzle body 33. The inner nozzle body 32 of the nozzle has depressions formed on its front end surface 32a in sealing contact with the base 33b of the recess 33a and located on the side of the nozzle outlet 41 and a circumferential wall 32b in close contact with the side wall 33c of the recess 33a. a nozzle interior including chambers and passages when the nozzle is fabricated by assembling the insert 32 into the nozzle body housing 35 (shell or jacket).

Said depressions are illustrated in particular in the nozzle insert 32 according to Figures 2 and 3.

The underside of the drive head 30 has a sleeve or neck portion 34 which is open downwards and into which the valve portion of the aerosol container can be fitted in a known manner. The interior of the sleeve 34 forms a main feed passage 27, 64331 from the upper end of which four feed passages 35 at the drive end 30 formed by longitudinal grooves in the circumferential wall 32b of the nozzle insert 32 extend axially to the nozzle center axis MA. This system comprises four feed passages 36, each communicating through their inlet 36a to the front end of the axial feed passages 35 and each passing obliquely to the central axis of the nozzle in a plane intersecting at right angles to this axis and opening tangentially to the common first chamber 37 symmetrically to the annular chamber 37 around the outer circumferential wall and together with the latter circumferential wall form a guide edge 36c.

From the annular chamber 37, the four channels 38 of the next stage of vortex formation lead inwards to the vortex chamber 45, which, as shown in Fig. 2, is formed by a protrusion 40 which supports an axial protruding annular flange 44 around its front surface 40a. The pressure formed inside the flange on the front surface 40a is the upper inner boundary of the vortex chamber 45, while the bottom surface of the recess 33a in the nozzle body 33 is bounded on the outside of the chamber, the annular flange 42 having an outer diameter slightly smaller than the inner diameter of the annular flange 44. little in the vortex chamber 45. Thus, the annular gap 46 remains between the annular flanges 44 and 42, which gap causes a significant increase in rotation in the vortex chamber 45, especially if the upper edge of the annular flange 42 extends to or past the upper edge of the annular flange 44 inside the vortex chamber 45.

The body housing 33 according to Fig. 3 is provided with an annular flange or rim 28 surrounding the recess 33a, which adheres so tightly to the corresponding recess 28a of the drive end 30 that it cannot detach from the drive end 30 even under the influence of a large pressurized fluid.

As can be seen, the chambers and channels are hermetically or at least liquid-tightly covered by the bottom surface 33b of the recess 33a. The pressure fluid 64331 te, which flows through the hollow interior of the nozzle, can thus only move through the channels and annular chambers to the nozzle outlet 41.

A flow resistance, i.e. a stage 23, is arranged in the channel, which causes mechanical decomposition and vortexing of the liquid in the channels 38 already during the attachment of the liquid. The circumferential edge around the front surface 40a of the protrusion 40 also results in fluid vortex flowing through the channels 38. Additional vortexing is provided by the action of an annular bellows or flange 42 disposed on the inside of the nozzle body 33 around the nozzle outlet 41 (Fig. 3).

In the spray nozzle according to the invention, the pressure fluid is accelerated, made to rotate and swirl in a controlled manner, which results in an optimal utilization of the achievable spraying force. The volume of the main supply channel 27 is substantially larger than the magnitude of the densities and channels connected to it. This large volume of the main supply channel 27 compared to the following lines, ducts and ducts is necessary, on the one hand, to achieve an unrestricted Olea compressive force to which the fluid is subjected without restriction and, on the other hand, to keep the ducts and ducts free even when the fluid dries. easily as a result of the slow evaporation of a relatively large amount of liquid in the main supply channel 27.

The spraying power of the spray nozzle according to the present invention can be adapted to a certain viscosity of the liquid, respectively, by changing the cross-section of the supply channels 35 and also the cross-sections of the spaces 36, 37, 38 and 39 of the hollow core portion. The high viscosity of a liquid naturally requires a larger cross-section than a liquid with a low viscosity.

The size of the small droplets of the shower can be adjusted by changing the distance between the pin-like protrusion 40 and the annular protrusion or flange 42 of the nozzle body 35, whereby as the distance decreases, the size of the droplets decreases.

Of course, this distance must not be too small, which would reduce the spray velocity and also increase the spray angle of the spray mist. The spray angle of the spray mist also depends on the length of the outlet 41 of the nozzle body housing 33. The longer the outlet, the smaller this angle.

Figure 4 further shows an embodiment of a nozzle insert 32 having six feed passages 35 leading to six other feed passages 36 and terminating in a common annular chamber 37, of which six secondary passages 38 lead to a common secondary annular chamber 39 bounded by a pin-like protrusion 40.

Figure 5 further shows an embodiment in which the spray nozzle according to the present invention is provided with not only two but three or more successive stages of vortex generation, i.e. in addition to channels, ducts and annular chambers 36, 37, 38 and 39, the nozzle insert 6 may have tertiary channels 48 and the annular chamber 49 may be provided with a vortex chamber 45 on the protrusion 40. Of course, the number of successive vortex generating steps also depends on the available pressure of the fluid so that the fluid flow is not unduly inhibited by excessive friction. The higher the pressure to which the liquid is subjected, the more the vortex formation steps can be arranged. In the arrangement according to Fig. 10, the height of the supply channels does not decrease conically, but gradually towards the vortex chamber 45. In this case, each phase forms a resistor, which results in eddy currents, and the narrowing caused by the channels causes the velocity of the fluid flow to accelerate (Fig. 6).

Since the spray nozzle according to the present invention is preferably used for dispensing a product which is free of gas and in particular also propellant, it is necessary in the case of a foam-forming product, for example shaving foam, to be distributed as foam, which requires the presence of a gaseous foam. in addition to the base phase liquid of the gas phase shaving foam. This can be achieved if the washing liquid, in a word as it flows through the supply channels 36, the annular chamber 37 and the channels 38, can absorb air which, when mixed with the liquid, forms a shaving foam.

Figure 7 shows a practical embodiment of a nozzle according to the invention and its configuration.

This device is a propellant-free embodiment over known aerosol spray containers. The spray device shown in Fig. 7 supports a spray nozzle according to the present invention and is filled with a dispensable liquid. The valve required in this device comprises an outer hollow insert 128 mounted on the valve seat 128, a piston 131, an elastic ring seal 132 and an inner hollow insert 130 disposed within the outer hollow insert 128. In this case, the space 133 between the outer hollow insert 128 and the inner hollow insert 130 acts as a fluid line to the piston 131. The rounded end of the outer hollow insert 128 has a hole 134 surrounded by a plurality of ribs 135. At the end supporting the outer hollow insert 128 the valve seat 137 as well as a plurality of ribs 136 around the bore 137. The length of the inner hollow insert is such that its ends rests firmly on the support ribs 135 and 136. The reservoir 138 containing fluid 139 is secured to the valve seat 129 so that the outer and inner hollow inserts 128 and 130 are 138 on the longitudinal axis. The tank 138 is surrounded by a rubber hose 140 which acts as an energy store. The features and characteristics of the container 138 and the rubber hose 140 as well as the outer hollow insert 128 will be explained in more detail because the valve device, which also includes the spray nozzle of the present invention, is a highly preferred embodiment. The fitting of the inner hollow insert 130 inside the outer hollow insert 128 is advantageous because it requires little installation work and further makes it possible to vary the cross-section of the fluid passage 133 without high cost if a particular product makes it necessary. In addition, compared to previously known valve pistons, the passages 141 of the piston 131 can be considerably larger for conducting fluid 139 without braking to the passages 102 and ring gas chambers described above under full overpressure to which they have been introduced through the rubber hose 140. According to the present invention, fluid 139 thus flows through the hole 134 into the intermediate space and from there through the hole 137 between the fins 136 up to the annular seal 132. When the drive head 101 is depressed, the piston 131 channels 141 are released so that the pressure fluid 139 can flow through the main channel 104 and the channels, annular chambers and through the nozzle insert 102 so that the liquid 139 finally exits as a fine spray mist from the spray nozzle according to the invention through the nozzle outlet 111 and in particular as long as the operating head 101 is pressed down, which functionally corresponds to an aerosol spray tank using propellant but without gas in this case.

The new nozzle eliminates the need for a pump that is not only needed for repeated pressure to force the product out, but also pumps the surrounding air and thus oxygen into the product tank, which naturally results in harmful oxidation of the product.

The container in which the product to be sprayed by the spray nozzle of the present invention is stored may be otherwise sealed against air, spores, bacteria and the like which could damage the product, whereby evaporation of the fragrances contained in the product can also be prevented during storage.

In the embodiment of Figure 7, a substance that stores energy to force the product out of the container is suitable for unloading the entire product out of the container evenly and with linear consumption. The product can be stored for several months without a significant loss of out-of-push energy during this time. This residual energy of the substance is sufficient to completely force the product out of the tank and to develop a spray mist with particles so small that the product mist can be produced even under unfavorable conditions, for example with a low ejection pressure.

Laboratory tests have shown that it is possible to save up to 75% of the propellant in the Aerosol canister thanks to this nozzle. In summary: 64331 (a) The spray nozzle of the invention is capable of delivering a liquid that is only under mechanical pressure, only about 2 atmospheres to provide a mist of the same quality as that achieved with commercially available spray nozzles at 6 atmospheres.

(b) In the case of aerosol spray canisters, this means that the propellant no longer has to act as ejection energy or spray as a result of being released into the ambient air, but now always provides a pressure just sufficient to take full advantage of the mechanical disintegration properties of the spray nozzle of the present invention.

(c) As a result, it is no longer necessary to use a propellant mixture, such as Freon 11 and Freon 12, which have hitherto been needed to generate a sufficiently large amount of gas to cause spraying and to vary the outlet pressure between different components of the gas mixture. amounts, due to their different boiling points, but instead, as the spray nozzle according to the invention is used, only propellant with a very low boiling point can be used and only in such an amount as to provide an overpressure of about 2 atmospheres in the Aero sol tank.

(d) Experience has shown that, for example, in the case of hairspray, only 19% Freon 12, corresponding to 1.7 atmospheric pressures, must be added to the aerosol container when using the spray nozzle according to the invention, while 77% Freon 11 and 12 gas mixtures corresponding to 3, 8 atmospheric pressures must be used to achieve similar mist grades. The spray nozzle according to the invention also operates at a pressure of 1.7 atmospheres or even 0.8 atmospheres depending on the required droplet size, provided that this pressure is generated by the propellant. This is because the propellant, after contributing as a source of ejection energy, is lowered, albeit in a small amount, into contact with the ambient air and thus compensates as a nebulizer for the pressure part, which compensates for the difference in the above-mentioned atmosphere.

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Laboratory tests have also shown that due to the mechanical dispersing properties of the spray nozzle according to the invention, liquids forced through the nozzle can evaporate due to the generated frictional heat.

In contrast, it has been found that a liquid mixture having a boiling point of less than 40 ° C can clog said channels, annular chambers and ducts as they cool as a result of the formation of a vortex which begins inside the spray nozzle of the present invention and as a result of vapor-bound heat.

Therefore, only spray liquids with a boiling point above the above-mentioned limit are preferred.

To achieve the above purposes, it has been found that the most preferred energy store is a hose of pure natural rubber to which the product container is fitted, i.e. a hose with a hardness of 40-43 ° shore hardness and thus a pressure of 0.6 to 0.8 atmospheres wall thickness per millimeter. However, since a wall thickness of up to 3 mm is used, a maximum atmospheric pressure of 2.4 is thus preferred as the ejection energy due to price, volume, weight and manufacture.

Claims (7)

A spray nozzle for distributing a pressurized liquid in the form of a fog, which consists of at least two parts (32, 33) which are transversely opposed to each other in the axis (MA) of the nozzle opening (41) in one part; between these portions an axially symmetrical flow path (35, 36, 37, 38, 39) is formed in the middle of which is a nozzle chamber (45) and a plurality of substantially radially in the mouth of the nozzle chamber and drawn channels (outside of this annular chamber (37, 39)) 36, 38), wherein the channels (36) further exhibit substantially substantially perpendicularly connecting channels (35) through which the pressurized liquid (139) is measured externally into the flow path system, characterized in that in the middle of the nozzle chamber (45). ) in the middle of the nozzle opening (41), there is a proximal elevation (40) extending to the vicinity of the nozzle opening (41) and / or at least one channel (36) having a deflection protrusion (23). Spray nozzle according to claim 1, characterized in that the deflection protrusion (23) is formed by stair steps. Spray nozzle according to Claim 2, characterized in that each stairway channel has a larger diameter in front of the staircase than behind it. Spray nozzle according to any of claims 1-3, characterized in that the deflection projection (23) is arranged in the area of the inlet opening and / or drain of the channel (38) or in the annulus (39). Spray nozzle according to any of the preceding claims, characterized in that the axial spacing of the ends of the nested elevations (40) from the nozzle opening (41) is at most 0.1 mm.