Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
  • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
  • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/0012—Apparatus for achieving spraying before discharge from the apparatus

Definitions

• the present invention relates to devices for nebulizing a liquid in the atmosphere, comprising a container intended to contain the liquid, having at least one outlet for the liquid to the outside of the container, the orifice being placed above the liquid, means for generating a gas flow to evacuate the liquid to the outside of the container, means for vaporizing the liquid in the gas flow, means for nebulizing the vaporized liquid.
• vaporization is meant the transformation of a liquid into fine droplets as well as its possible passage to the gaseous state, and by nebulization the transformation of the fine droplets obtained by vaporization into very fine droplets.
• Such devices can be used as a simple product diffuser or allow odors to be diffused into the atmosphere, when the liquid contained in the container is an odorous liquid, anywhere according to the user's desire or needs, in particular in laboratory to study the influence of odor on the behavior of individuals or the composition of odors, in a marketing agency to ensure the promotion of a product, in large areas in order to influence the consumption of products, in a any place to ensure its odorization, etc.
• Uses of this type of device in aromatherapy are also conceivable.
• the prior art teaches in particular with document EP 0 608 176 a nebulizer of the type described above.
• the nebulizer comprises a container containing the liquid to be nebulized, at the base of which is fixed a tube for the arrival of the gas flow.
• the tube passes through the liquid in the container and is provided with a venturi at its upper end above the liquid, a venturi to which a liquid suction pipe is connected laterally.
• the upper part of the container is extended by a fractionation chamber intended to reduce the size of the liquid droplets which are in suspension in the gas flow downstream of the venturi, this in order to diffuse a mist of very fine droplets at the outlet of the nebulizer.
• Such a nebulizer works well, but has drawbacks which can greatly limit the possibilities of using it. Indeed, the liquid is contained in a container which forms a body with the nebulizer and at the base of which the venturi is fixed, which does not confer great flexibility of use. Such a configuration also results in difficult cleaning of the parts making up the nebulizer, in particular of the container, in particular when it is desired to use a different product, and a high manufacturing cost. In addition, it is not easy to fill the container with spray product each time it is empty.
• EP 0 655 282 also discloses a nebulization device for odoriferous liquid in which the liquid to be nebulized is placed in an interchangeable cartridge, disposable when empty. It is the interchangeable cartridge which here comprises the venturi intended to vaporize the liquid.
• This type of nebulizer can make it possible to solve the drawbacks of the uneasy filling and cleaning of the nebulizer previously described.
• the cartridge which is changed with each refill of the product, includes sophisticated technical devices, in particular the venturi.
• this cartridge being intended for a single use, the nebulization means which it comprises cannot be as efficient as those of a device for which they are intended to be amortized over the lifetime of the device.
• the present invention proposes to overcome these drawbacks, and to provide other advantages. More specifically, it consists of an apparatus making it possible to nebulize a liquid in the atmosphere, comprising:
• a container intended to contain said liquid, having at least one liquid outlet orifice towards the outside of said container, said orifice being placed above said liquid, - means for generating a gaseous flow for discharging said liquid towards the outside of said container,
• vaporization means and said nebulization means are integral with a body capable of being engaged and detachably held in said orifice of the container, said body comprising a conduit for discharging the liquid towards the outside of the container.
• the apparatus according to the invention makes it possible to use, to contain the liquid to be nebulized, a simple container provided with an orifice which advantageously serves both for filling and for evacuation of the liquid.
• a container can be of the vial type in the upper orifice of which the body will be placed, comprising in particular the nebulization and vaporization means.
• the container can advantageously be discarded when it is empty, with minimum production and operating costs because this container can be made up of the only means necessary to retain liquid inside, ie an envelope waterproof.
• the device according to the invention provides great flexibility and ease of use by this design.
• the vaporization and nebulization means reused at each change of bottle allow an appropriate sophistication of these if necessary.
• the baffle column allows a micro-diffusion of the liquid to be nebulized, due to the extreme fineness of the droplets obtained, necessary to allow a good suspension of the nebulized liquid in the atmosphere, a low consumption of liquid as well as a better yield. in terms of odor diffusion into the atmosphere for example.
• the vaporization means comprise a venturi.
• the column comprises a plurality of inclined walls forming baffles on which said vaporized liquid abuts, and the inclined walls form an angle greater than 90 ° with the longitudinal direction of flow flow, so as to avoid a retrograde flow of the latter.
• said inclined walls each have a hole for the passage of the flow, the respective holes of two successive walls being offset.
• said hole takes the form of a venturi.
• two successive inclined walls are symmetrical with respect to a plane perpendicular to the longitudinal direction of flow flow.
• the means for generating a gas flow for discharging the liquid to the outside of the container comprise a flow accelerator placed downstream from the nebulization means.
• the flow accelerator comprises a fluid flow enveloping said gas flow and the nebulized liquid downstream of the nebulization means.
• said flow accelerator comprises a fluid flow conveyed axially in a venturi type duct comprising a convergent followed by a cylindrical part, said gas flow and the nebulized liquid being introduced into said cylindrical part of said venturi type duct laterally.
• the invention also relates to a system making it possible to control the nebulization of a liquid in the atmosphere, characterized in that it comprises at least:
• a gas sensor making it possible to provide a measurement of the concentration of the nebulized liquid in the atmosphere, means for controlling the operation of said device as a function of at least a predetermined setpoint and of said measurement supplied by said gas sensor.
• FIG. 1 represents a view in longitudinal section of a first exemplary embodiment of an apparatus making it possible to nebulize a liquid in the atmosphere, according to the invention.
• FIG. 2 represents a view in longitudinal section of a second exemplary embodiment of an enlarged detail of the apparatus of FIG. 1.
• Figure 3 shows in perspective an overview of a system for controlling the nebulization of a liquid in the atmosphere.
• the apparatus making it possible to nebulize a liquid into the atmosphere, or nebulizer, comprises a container 1 intended to contain the liquid 2 to be nebulized, the container 1 having an orifice 3 for the outlet of the liquid towards the outside of the container, the orifice 3 being placed above the liquid 2, means 4 for generating a gas flow to evacuate the liquid 2 towards the outside of the container 1, means 5 for vaporizing the liquid 2 in the gas flow, nebulization means 6 of the vaporized liquid.
• the vaporization means 5 and the nebulization means 6 are integral with a body 7 capable of being engaged and detachably held in the orifice 3 of the container 1, as shown in FIG. 1, the body 7 comprising a conduit d discharge 8 of the liquid 2 towards the outside of the container 1.
• the container can advantageously consist of a bottle 1 for packaging the product to be nebulized.
• the single orifice 3 of the bottle 1 is used for filling and evacuating the liquid 2, and will include a sealed stopper (not shown), used for packaging the product, stopper which will be removed to engage the body 7 in the hole.
• the bottle 1 will advantageously be rigid or semi-rigid so as to allow the body 7 to be held in the position of engagement in the orifice 3.
• the body 7 will have at one of its ends a shape 14 capable of coming s 'engage on the upper part of the bottle 1 comprising the orifice 3.
• the form 14 may include, as shown in Figure 1, a holding tube 15 engaged in the orifice 3 or on the flange 17 of the bottle by a forced fitting or a helical thread assembly (not shown), or the like, and if necessary an additional stop 16 resting on the upper part of the bottle 1 or of its flange 17.
• the shape 14 of the body 7 will obviously be adapted to that of the container 1 used for the assembly of these two elements.
• the container 1 or the body 7 will include any vent means making it possible to empty the container by sucking the liquid into the body as described below.
• the body 7 will be hollow in order to accommodate the vaporization and nebulization means as explained below and will have to allow on the one hand a suction of the fluid 2 by its lower part through the orifice 3 of the bottle 1, and on the other hand an outlet from the gas stream comprising the liquid nebulized by its upper part.
• the body 7 will be made of a rigid material, for example steel or plastic, and will advantageously consist of two parts 19 and 20 which can be dismantled from one another in order to facilitate access to the interior of the body 7. In the example of FIG.
• the body 7 takes the form of a tube in two parts, a lower part 19 having at its lower end the shape 14 already described for associating a container, and an upper part 20, for example screwed (not shown) or force-fitted on the lower part 19, which comprises at its upper end an opening 21 through which the liquid nebulized in the gas flow exits.
• the means for generating a gas flow to evacuate the liquid 2 towards the outside of the bottle 1 comprise a pump 4 which delivers a flow of gas supplied to the body 7 by means of a pipe 18 as will be explained below with a description of the spraying means.
• the gas used will depend on the use of the nebulizer, and will advantageously be the ambient air in the case of diffusion of odor from an odorous liquid 2, as shown in the example.
• the means for vaporizing the liquid 2 in the gas flow advantageously comprise a venturi 5 placed for example in the longitudinal axis 23 of the body 7 in its lower part, but advantageously fixed to the upper part 20, by means of a plate 35 and of screws 34 for example, in order to produce an upper part of the body 7 that is compact and comprising the means for vaporizing and nebulizing the liquid.
• the lower part 19 of the body has the simple function of carrying the form 14 allowing an association of the body 7 with the container 1. In the event of a change in shape of the container 1, only the lower part 19 which can be removed from the body 7 will have to be replaced. .
• the plate 35 for fixing the venturi 5 will advantageously include at least one through passage 36 which allows a return by gravity downstream upstream of the nebulization means, into the container 1 through the orifice 3, of the liquid which is insufficiently vaporized and which would not be not entrained in the nebulization means 6 due to the excessive weight of the droplets.
• the passage 36 may for example consist of at least one hole placed in the lower part of the plate 35.
• the pipe 18 routes the air flow in the body 7 to the lower end 22 of the venturi 5 passing through the upper end 24 of the body 7 along the longitudinal axis 23 of the latter in the upper part 20 containing the nebulization means placed above the vaporization means, then following in an offset fashion in the lower part 19 of the body 7, so that the pipe 18 can be replaced in the longitudinal axis 23 of the body 7 while directing the air flow towards the upper end 24 of the body 7, as shown in FIG. 1. It should be noted that the pipe 18 could enter the body 7 and follow a path in a different way from that previously described.
• the function of the pipe 18 is in fact to convey the air flow to the inlet of the venturi 5 in order to create a depression on the inner wall of this venturi onto which a duct 25 opens, the other end 26 of which dips into the liquid 2, as shown in FIG. 1.
• the liquid 2 is thus sucked into the venturi 5 and vaporized in the air flow upwards in the direction of the nebulization means. It is possible, for example, to perform a lateral entry of the pipe 18 in the body 7, for example in its lower part 19 (not shown).
• the nebulization means comprise a column 6 with baffles placed downstream of the venturi 5 for nebulizing the vaporized liquid 2, ie above the venturi 5 according to the arrangement along a vertical axis of the means represented in FIG. 1.
• the venturi 5 makes it possible to vaporize the liquid 2 in the gas stream into fine droplets
• the column 6 with baffles makes it possible to fractionate these fine droplets into particles of a size of the order of a few micrometers capable of better diffusion of the liquid in the atmosphere in which it is rejected by the outlet 21 of the body 7 downstream from the column 6.
• the column 6 advantageously comprises a plurality of inclined walls 9 placed substantially one above the other, forming baffles on which the two-phase flow abuts generally moving from bottom to top, ie the liquid vaporized in the gas flow, the inclined walls 9 forming an angle ⁇ greater than 90 ° with the d longitudinal irection 10 of the flow, so as to avoid a retrograde flow of the latter between the impact zone of the two-phase flow on one wall and the passage hole of the latter to the next wall.
• the angle ⁇ will preferably be between 95 ° and 135 °, for example substantially equal to 105 ° as in the example shown in FIG. 1.
• the value of the angle ⁇ depends on the size of the particles that the we want to get out of the nebulizer; the closer the angle ⁇ is to 90 ° the finer the particles of nebulized liquid, the further it is 90 ° and the more the flow flow is improved and the particles are larger.
• Each wall 9 can for example be carried by a tubular junction 27 of an outer shape complementary to the inner shape of the upper part 20 of the body 7, thus allowing a contiguous adjustment of the outer surface of the tubular junction 27 on the inner surface of the upper part 20 of the body 7 and a practical stacking of the walls 9, as shown in FIG. 1.
• a plurality of walls 9 thus provided with their own tubular junction, for example 4 walls, can be stacked one on the another in order to produce the column 6 with baffles, the wall 9 and its tubular junction 27 being inscribed in a straight cylinder in the example shown.
• Each inclined wall 9 will advantageously include a hole 11 for the passage of the two-phase flow, the respective holes 11 of two successive walls 9 being offset, so as to ensure an impact of the flow on the next wall without directly passing through the hole 11.
• the hole 11 will for example be cylindrical of circular or oblong section and will be placed on the wall substantially in the most downstream area of the impact of the flow on this wall, in the longitudinal direction of flow, as shown in FIG. 1.
• the wall of the hole 11 will preferably be non-tangent to the interior wall of the tubular junction 27 and will be slightly in withdrawal towards the longitudinal axis 23 of the body 7 as shown in FIG. 1.
• the holes of two successive walls 9 may be symmetrically opposite with respect to the longitudinal axis 23 of the body 7, and diametrically opposite in the case of a body of circular cross section.
• the holes 11 could alternatively be arranged so that the two-phase flow in the column 6 through the holes 11 adopts a generally substantially helical profile, the holes being angularly offset in the same direction of rotation according to a determined pitch, by regular example.
• two successive inclined walls 9 may be symmetrical with respect to a plane perpendicular 12 to the longitudinal direction 10 of the flow, as shown in Figure 1, this to allow a regularity of the two-phase flow.
• the holes 11 for passage of the flow from one wall 9 to the next will adopt a structure of the venturi type comprising a convergent 50 followed by a cylindrical part 51.
• the venturi-type hole 11 here makes it possible to increase the efficiency of the nebulization column and to contribute to optimizing the fractionation of the particles in order to increase the factor of homogeneity of the particles for a given particle size.
• Column 6 advantageously comprises below each wall 9 from the second wall in the direction of flow after the venturi 5, a funnel 52 making it possible to collect by gravity the liquid not entrained in the two-phase flow, and route in the venturi type hole 11 according to two alternatives described below.
• the first alternative (not shown) is that the lowest part of a funnel 52 is linked to the outlet of the hole 11 located upstream so that the liquid drained by the funnel 52 flows by gravity into the hole 11 and is thus rejected in the two-phase flow at the outlet of the hole.
• a second alternative consists in that the outlet of the hole 11 located upstream rises above the bottom part of the funnel 52, and that a conduit 53 is produced in the bottom of the funnel 52 conveying the condensed liquid in the hole 11, and more particularly in the cylindrical part of the hole 11, as shown in FIG. 2. This second alternative is particularly effective 8
• the funnels and conduits 53 possibly make it possible to avoid fouling of the baffles caused by accumulation of product.
• the nebulization column shown in FIG. 2 advantageously includes shims 54 of thickness making it possible to adjust the distance separating the outlet of a hole 11 from the next wall 9, this in order to ensure an adjustment of the particle size distribution liquid.
• the distance between the venturi 5 and the first wall 9, and the distances between the outlet of a hole 11 and the next wall will preferably be decreasing in the direction of flow, this in order to contribute to optimize the fractionation reaction of the liquid droplets.
• the diameters of the holes 11 for passage of the flow will preferably also decrease from the hole 11 of the first wall 9 to the hole of the last wall in the direction of flow.
• the column 6 may comprise an element 55 interposed respectively between two successive walls 9, and carrying the funnel 52.
• An element 55 will advantageously be placed above the last wall 9 in the direction of flow.
• the nebulization column shown in Figure 2 could be inserted into the body 7 of the apparatus shown in Figure 1, for example. It should be noted that the passage from the pipe 18 for supplying the gas flow to the venturi has not been shown in FIG. 2. In addition, it should be noted that two successive holes 11 have been aligned in order to reduce according to the needs the effects of the nebulization column.
• the gas flow comprising the liquid 2 nebulized at the outlet of the last wall 9 of the column 6 is then evacuated from the nebulizer by the opening 21 at the top of the body 7.
• the opening 21 can be provided with a simple nozzle 28 if necessary if applicable, fixed or directive as required.
• the apparatus shown in FIG. 1 comprises means 4 for generating a gas flow for discharging the liquid 2 towards the outside of the container 1 as described above, which additionally and advantageously include a flow accelerator 13, placed in downstream of the nebulization means 6, and more particularly downstream of the opening 21 of the body 7, as shown in FIG. 1.
• the flow accelerator 13 preferably comprises a fluid flow enveloping the gas flow and the nebulized liquid, at the outlet of the nozzle 28.
• the function of the accelerator is to avoid or limit the condensation of the liquid in the nebulization column, this by creating a fluid flow for driving the gas flow and the nebulized liquid leaving the body 7.
• Another function of the accelerating flow is to provide additional energy to the nebulized liquid so as to project it at a greater and variable distance according to the flow rate drive fluid.
• Another function of the accelerating flow is to provide an insect trap by the projection of pheromone.
• Another function of the accelerator flow is to allow a dilution of the nebulized liquid.
• the output of the two-phase flow out of the body 7 is helped by the friction of the accelerator fluid flow enveloping the two-phase flow.
• the accelerator fluid flow can be supplied by the pump
• the accelerator flow will be supplied by an independent pump 37, and routed out of the body by a pipe 29 independent of the venturi supply line 18.
• the accelerator flow can advantageously be controlled and controlled independently of the gas flow supplying the venturi, in order to obtain greater flexibility of use, and an optimal adjustment of the accelerator flow. compared to the two-phase flow for better performance of the nebulizer.
• the supply line for the accelerator fluid flow is connected to a nozzle 30 attached for example to the nozzle 28, as shown in FIG. 1.
• the accelerator flow is produced around the nozzle 28 inside the nozzle 30 so that it envelops the gas flow and the nebulized liquid, at the outlet of nozzle 28, this in order to create a maximum friction of the accelerator flow on the two-phase flow.
• the nozzle 30 may be provided with a nozzle 31 for output of the accelerator flow, of the gas flow, and of the nebulized liquid, the nozzle 31 being able to be mounted on a ball joint 32 in order to allow a choice of the direction of outflow.
• the nozzle 28 penetrates inside the body by a projection 56 intended to prevent droplets of liquid from escaping through the opening 21.
• the projection 56 will be provided, on its outer surface, at least one gutter 57 for channeling the droplets of liquid which would condense on the projection, and in order to prevent them from being sucked into the flow leaving the nebulizer.
• the end face 58 of the projection 56 will preferably be vertical, the gutter being composed of at least one groove placed in a vertical plane and surrounding the projection, as shown in FIG. 1.
• the flow accelerator can be produced by using a venturi-type opening 21 (not shown) comprising a convergent followed by a portion of cylindrical conduit.
• a venturi-type opening 21 (not shown) comprising a convergent followed by a portion of cylindrical conduit.
• the two-phase flow at the outlet from the nebulization column is introduced laterally and in a regularly distributed manner, by lateral conduits, inside the cylindrical part of the upper opening of the body, 10
• the accelerator flow being conveyed axially in the main duct of the venturi type opening, that is to say in the convergent.
• the two-phase flow enters the outlet opening of the nebulizer under the joint effects of the suction due to the venturi and the pressure due to the nebulization column, and is accelerated towards the outlet of the nebulizer.
• the system making it possible to control the nebulization of a liquid in the atmosphere represented in FIG. 3 comprises at least a plurality of devices 40 according to the invention, as described previously for example, making it possible to nebulize a liquid in the atmosphere, a plurality of gas sensors 41 A making it possible to provide a measurement of the concentration of the nebulized liquid in the atmosphere, control means 42 of the operation of the devices 40 as a function of at least a predetermined set point and of the measurements provided by the sensors gas.
• the servo means 42 advantageously comprise an electronic module 43 for controlling and controlling the devices 40, a power electronics 44, and a supply 45 of electrical energy.
• the electronic command and control module 43 is advantageously provided with software for monitoring the emissions of nebulized liquid.
• the operator enters the setpoint (s), via a keyboard 47, into the command and control module 43 which transmits the latter to the power electronics 44 which controls the operation of the devices 40 with respect to this or these instructions, with the help of sensors 41, in particular gas sensors 41 A which return to the electronic module 43 the measurements made of the concentration of the nebulized liquid in the atmosphere.
• the system according to the invention described above can thus operate automatically.
• the command and control electronics will advantageously be provided with a display 48 for controlling the operation of the system, on which the setpoints as well as the values of the sensors 41 may appear.
• the system according to the invention will advantageously be provided with a portable programming module 46 making it possible to remotely ensure wireless communication with the command and control electronics 43.
• the portable programming module 46 will perform the functions of the keyboard and of the electronic display 43.
• an operator can intervene in the operation of the devices 40, by modifying the operating instructions directly from the sites where the nebulization devices 40 are placed.
• the system according to the invention will include means for regulating the flow rate of the gas flow supply pumps of the vaporization means of the devices and the flow rate of the fluid supply pumps of the flow accelerator means output of devices.
• the means of regulating the flow rate of the pumps can for example consist of respective electrovalves whose opening and closing are controlled according to a determined frequency and by modifying the ratio 11
• the system according to the invention will include means for controlling the level of liquid in the container of the apparatuses 40, by any known means, for example an electric level gauge 41B, in order to stop the operation of the apparatuses whose liquid has been completely nebulized, and / or to manually or automatically fill the containers with liquid, and / or simply to issue a warning signal.
• any known means for example an electric level gauge 41B, in order to stop the operation of the apparatuses whose liquid has been completely nebulized, and / or to manually or automatically fill the containers with liquid, and / or simply to issue a warning signal.
• the system according to the invention will include means for heating the liquid to be nebulized, for example by means of Peltier effect modules, placed below the container of the apparatus 40.
• the system will jointly comprise temperature sensors 41C of the liquid in order to control and enslave the operation of Peltier effect modules in relation to a liquid temperature setpoint.
• the system according to the invention will advantageously include one or more bases making it possible to support and each maintain at least one device according to the invention, base to which the heating means will be associated as well as one or more temperature sensors 41C.
• the system according to the invention will include ambient temperature sensors 41D and sensors 41E allowing a measurement of the hygrometry.
• the sensors 41 A to 41E will be connected to the command and control electronics 43 in order to advantageously allow automatic operation of the system according to the invention relative to the measurements transmitted by these sensors.
• the system according to the invention described above is particularly suitable for the controlled diffusion of odors into the atmosphere, which can be different depending on the devices and the places in which these are placed.

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• 1998
  • 1998-04-03 FR FR9804156A patent/FR2776947B1/fr not_active Expired - Fee Related
• 1999
  • 1999-04-02 DE DE69919855T patent/DE69919855D1/de not_active Expired - Lifetime
  • 1999-04-02 AU AU30404/99A patent/AU3040499A/en not_active Abandoned
  • 1999-04-02 US US09/647,691 patent/US6328233B1/en not_active Expired - Fee Related
  • 1999-04-02 AT AT99911872T patent/ATE275002T1/de not_active IP Right Cessation
  • 1999-04-02 WO PCT/FR1999/000779 patent/WO1999051358A1/fr active IP Right Grant
  • 1999-04-02 EP EP99911872A patent/EP1066118B1/de not_active Expired - Lifetime

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