Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
  • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
  • B01F25/31243—Eductor or eductor-type venturi, i.e. the main flow being injected through the venturi with high speed in the form of a jet
• • 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
  • B05B7/0018—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 with devices for making foam
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
  • B01F25/3111—Devices specially adapted for generating foam, e.g. air foam
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
  • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
  • B01F25/31241—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the circumferential area of the venturi, creating an aspiration in the central part of the conduit
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
  • B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
  • B01F31/86—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations with vibration of the receptacle or part of it
• • 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
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
  • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
  • B05B7/0425—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid without any source of compressed gas, e.g. the air being sucked by the pressurised liquid
• • 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
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
  • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
  • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
  • B05B7/0458—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber the gas and liquid flows being perpendicular just upstream the mixing chamber
• • 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
  • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
  • B05B7/2489—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
  • B05B7/2494—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device a liquid being supplied from a pressurized or compressible container to the discharge device
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/20—Mixing gases with liquids
  • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
  • B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
  • B01F25/3125—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characteristics of the Venturi parts
  • B01F25/31253—Discharge
  • B01F25/312533—Constructional characteristics of the diverging discharge conduit or barrel, e.g. with zones of changing conicity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
  • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
  • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S261/00—Gas and liquid contact apparatus
  • Y10S261/26—Foam
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S261/00—Gas and liquid contact apparatus
  • Y10S261/75—Flowing liquid aspirates gas

Definitions

• the subject of the present invention is a device for generating foam and an apparatus making it possible to produce a foam, an aerosol, an emulsion or bubbles, comprising a nozzle for introducing the liquid, coaxial with a venturi stage comprising a convergent disposed opposite the nozzle, and a gas inlet coaxial to the corresponding nozzle with the convergent and a divergent
• Foam production systems are used for example, to apply an active product to a surface to be cleaned, degrease, sanitize and depollute. chemically deactivate or neutralize
• Foam generation systems have evolved in recent years with the introduction of systems allowing, in particular the simultaneous introduction of gas and liquid into a liquid-gas-liquid dispersion space which can be adjustable to modify the proportion of gas introduced as decnt in WO 9531287 Even if the proportion of gas can thus be significant, there is no action of division of the bubbles by cavitation and their size remains visible to the naked eye
• the outlet nozzle is adapted to atomize the fluid by increasing the parameters of pressure and speed of the fluid, which leads to a lowering of the static pressure, the potential energy of the static pressure thus being transformed into kinetic energy.
• the present invention relates to the formation of a foam of minimum density, as homogeneous as possible, using the cavitation phenomenon which was avoided in the prior art.
• the system operating values are greater than 90% of gas volume in the final mixture.
• the device for forming foam by the Ventu ⁇ effect, mixing a product in the liquid phase and a product in the gaseous phase comprising a nozzle for introducing the liquid, coaxial with a venturi stage comprising a convergent disposed opposite the nozzle.
• the neck of which is of diameter “D” and a gas inlet coaxial with the nozzle corresponding to the converging, the gas being sucked in by a ventu ⁇ effect in a divergent and directed onto a mixing chamber connected to a kind of foam is characterized in that the divergent part of the venturi comprises at at least two zones of progressive horns with ruptures between the zones causing with the determined shape of the venturi a cavitation and opens into a chamber of turbulence
• the device uses the difference in kinetic energy between that of the free incident liquid jet emitted by the nozzle, causing a conical dispersion which comes into contact with the neck diameter convergent "D" which decreases the speed of the liquid-gas mixture by lowering its pressure, and that of the lower pressure liquid-gas mixture stored as potential energy in the gas bubbles during suction in the jet and compression in the convergent of the venturi
• This energy is released in the form of energy of cavitation in the divergent venturi comprising sections of progressive conicts which creates the phenomenon of cavitation due to the excess of gas in the liquid associated with the increase of the static pressure and the decrease of the speed of the fluid in the divergent and in the turbulence chamber located downstream of the divergent II a turbulent zone in the divergent is formed, by the tears of conicity put in cavitation waves which causes the division of bubbles up to submillimetric dimensions If active products and in particular surfactants are used in suitable concentration in the liquid-gas mixture, a foam of very low density is
• the present invention uses a nozzle creating a free jet of low conicity a convergent neck adapted to the dimension of this jet followed by a divergent L assembly allows to create a gas suction upstream of the neck by Ventu ⁇ effect and to create with the gas thus sucks the conditions of a cavitation on your walls of divergent divergence Unlike other uses already de ⁇ rtes, this divergent forms wall of entry and creation of turbulence for a chamber of turbulence
• An object of the present invention is a device for producing low density foam, therefore containing a high proportion of gas and a large contact surface. with the surface on which it is dispersed at the outlet of the system. It uses the forces generated by cavrtantes depressions. same controlled in a stabilization chamber, to atomize the liquid by projecting it.
• the present invention further relates to an autonomous foam generation apparatus using the above device, which achieves homogeneity and reduced dimensions of bubbles allowing the active product to have a contact surface and an action brought to levels never reached. by conventional foam production systems.
• Another object of the present invention is the production of a two-phase mixture in which the size of the bubbles is as small as possible, that is to say in all cases with a diameter of 20 microns.
• the coupling of the cavitation, the turbulent flow and possibly the energy supply in the form of ultrasound allows maximum division of the gas bubbles present in the fluid and the formation of a stable foam at the outlet of said bedroom.
• the device in addition to the formation of foam, makes it possible to mix and dose an incident fluid under pressure with a sucked gas, to generate bubbles, aerosols or emulsions.
• the adaptation of the system is perfectly carried out if the vacuum measured upstream from the neck of said nozzle outside the incident free jet at high pressure is, (for example), greater than 1 bar or more generally close to the maximum for the fluid considered.
• the distance between the outlet of the nozzle and the neck has an influence on the size of the gas cavities admitted into the Venturi and the quantity of gas admitted, it will be comp ⁇ se according to the invention between 2.d and 20.d (if the we call "d" the nozzle outlet diameter), the diameter D of the neck will be comp ⁇ s according to the length of said free jet between 1 d and 4.d.
• FIG. 3 an external view of an embodiment of the apparatus according to the invention
• FIG. 4 an embodiment of an apparatus according to the invention, seen in partial section, using a pyrotechnic charge
• a nozzle 1 is adapted to disperse a fluid according to the flow and pressure parameters determined according to a cone of angle at the apex of low value ( ⁇ 20 °) and receives the fluid under a high inlet pressure through a supply channel 9
• the active element comprises two ultrasonic wave generators 10 positioned radially on the turbulence chamber 4
• the divergent comprises three zones of increasing conicities 14 15, 16, the first zone 14 having an angle a ⁇ comp ⁇ s between 0 and 10 °
• the second zone 15 has an angle u2 greater by at least 5 ° than the angle u1 presented by the first zone, so that the lines of separation of the zones are located at distances between 2D and 4D for the line 14,15, and between 5D and 8D for the line 15, 16 with respect to the line X, 14, materializing the exit from the X neck of conicity 0 °
• the third zone 16 has an angle at the top u3 at least 15 ° greater than the value of the angle ⁇ 1 and inferior to the value of the angle al plus 35 ° and is of a length less than 20D
• the divergent 13 preferably comprises surface discontinuities such as scratches or squares
• the mixing chamber adjustable in length by a thread 21 is of a length greater than 20D and leads to the outlet by a conduit (20)
• the fluid constitutes one or more active ingredient (s), in solution or not, in emulsion or not, containing or not a solvent or any other liquid endowed with specific physicochemical characteristics. or adapted to a given application, is ejected in coaxial jet to the Ventu ⁇ 22 tube
• the mixing of the two phases is carried out in a free jet, that is to say that the static pressure exerted by the gas on the jet is that of the gas entering the slots
• Figure 2 shows the detail of a preferred embodiment of the divergent Ventun according to the invention. This embodiment includes three successive tapers of increasing angle value at the top: ai. u 2. ⁇ 3.
• FIG. 3 represents a device which does not include an ultrasonic exciter but which, as in FIG. 1, has a gas suction opening in the form of a circular slot.
• the increase in the gas inlet pressure helps to a certain extent in increasing the proportion of gases admitted into the neck 2.
• the gas is air and the incident jet is an aqueous solution at the aforementioned high pressure
• pressurizing the incident gas to 10 bars results in a gain of at least 50% in the quantity of gas admitted.
• its effect on the free jet becomes neutral then disruptive, being able to cause phenomena of turbulence in the convergent 18 and even phenomena of cavitation at the level of the neck for high gas and incident jet pressures which is undesirable.
• the conformation of the divergent and the turbulence chamber generate a significant depression upstream of the venturi which allows the foam production system to function very well and is already clearly superior to other systems even without gas overpressure
• the advantage according to the invention of the introduction of the gases is to introduce by this means at input 3, gases having an action or an activity specific to the application of the process
• gases having an action or an activity specific to the application of the process For example, it is possible to use ozone in a sanitizing application or even in certain cases of pollution control, halon gases may be used in a fire-fighting application or nitrogen or even nitrous oxide in a food, cosmetic or pharmaceutical emulston application.
• the cavities are subjected to static pressure and are shaped into bubbles, but without cavitation phenomenon due to the increase in the speed of the fluid.
• the static pressure has decreased and the speed of the mixture has increased compared to the entry of the jet into the Venturi: the speed of the mixture must be greater than a certain limit directly dependent on the Reynolds number which defines the nature of the fluid.
• the Reynolds number is given by the formula:
• mixing takes place at the pressure of introduction of the free jet gases and the cavitation precursors are formed by transformation of the kinetic energy of the incident fluid into potential static compression energy at the moment when the free jet contacts the Venturi converging 18. it is this energy returned in cavitation energy on the walls of the divergent 15,16 which generates a chaotic regime in the chamber 4.
• the operating criterion of the device is that the flow comes out non-turbulent at the neck 2 (with a Reynolds number between 2300 and 3000) and allows cavitation in the divergent 13. Furthermore, the proportion of gas by volume can exceed 50 % and even reach or even exceed 80% in some cases.
• the changes in taper or discontinuity of the divergent 17 cause the formation of turbulences which contribute to the slowing down of the fluid and favor the cavrtation which occurs firstly along the walls where the static pressure rises faster.
• the potential energy stored by the bubbles in the passage of the Ventu ⁇ is restored during cavitation in the turbulent medium in the form of shock waves.
• the kinetic energy thus released propagates the phenomenon of cavrtation, atomizes the liquid and allows the obtaining of submillimetric bubbles.
• the angle at the apex “1 of the first section 14 of the diverging portion must remain below 10 °.
• This angle is constant over said section, or varies continuously between 0 ° and the value retained below 10 ° in order to avoid or reduce maximum the cavrtation phenomenon at this location, which would not allow the device to be optimized
• the angle at the top u2 of the second section 15 must be at least 10 ° greater than that mentioned for the first section so that the phenomenon cavitation is maximum at this location
• the apex angle ⁇ 3 of the third section 16 must for the same reasons be at least 10 ° greater than that of the section 15
• the outlet 20 from the chamber 4 is coaxial with the neck 2 Whatever the fluid used, there is formation at the outlet of the divergent 13 of bubbles of very small sizes, in the case of a non-reactive fluid or little surfactant, these bubbles disappear very quickly as soon as they leave the chamber, and even if the effect of cavitation causes molecular breaks and favese your creation of free radicals, the product will leave the system in almost liquid form or return in this form very quickly when the mixture is dispersed in free jet
• the micro-bubbles formed by this process form a very light foam having very good tixotropic qualities but also very homogeneous and retain these properties even after dispersion in the open air.
• a foam containing surfactants in sufficient quantity typically
• the essential characteristic of the foam formed according to the invention is the formation of microscopic or even micronic bubbles at the level of chamber 4 This distinctive property makes it possible, during the diffusion of the product by a nozzle adapted, not to disperse droplets as most of the systems but to ensure your diffusion of small bubbles and even in most cases of heaps of micro-bubbles These naturally tend to open air to expand and regroup But I homogeneity and the large contact surface produced by the foam allows the active products a reinforced and almost instantaneous action in particular, with regard to the actions of ionic compounds of polar compounds and of surfactants This property is preserved for several minutes if the thickness of foam spread per unit of area is sufficient compared to the quantity of product to be treated per quantity of surface, in fact the reaction of an active compound d u sparkling mixture and in particular, a surfactant with the medium to be treated leads to the disappearance of the bubbles concerned by this reaction this phenomenon is easily visualized by a user of the apparatus or of the process and allows him to agree on the parts to be treated because dirt
• the length of the section 14 of the diverging part is 1.5 to 5 times the diameter D of the neck 2, it is however possible to extend this portion, up to 30 times this length, if the 'application requires it, provided that the angle of this conicity is continuously variable between 0 ° and the selected value less than 10 ° at the exit of this section and this in order to limit in this phase the cavrtation phenomenon.
• their preferred production length will be from 1 to 6 times the diameter of the neck 2 for the part marked 15 in FIG. 1 and less than 30 times this same diameter for the part 16, however these values being adapted according to the first use of the invention concerning aqueous solutions, different lengths can be envisaged for other fluids or mixtures of emulsion type
• the diverging part 13 comprises three zones of increasing conicts with zone breaks
• the diverging part can also have a number of zones different from three, the angles of the conicity zones will continuously vary and the ruptures be softened.
• outlet section 20 will be sized according to the area of the neck 2 to have a surface area between 1, 2 and 3 times the area of said neck, higher values can be considered for high concentrations of surfactants and a quantity of gas higher per unit of liquid volume
• the preferential flow of the fluid leaving the first section is laminar along the walls
• this portion of the fluid is then subjected to a high static pressure due to the angle of this portion of the diverging portion and to turbulence which help to decrease the speed
• the mixture near said wall is then in ideal cavitation conditions.
• the gas bubbles implode, releasing the energy stored during their training at the entrance to the Ventu ⁇ .
• This release of energy leads to the disappearance of bubbles and the formation of micro-bubbles, moreover it can break atomic or molecular bonds.
• the metal of the walls is then subjected to the combination of violent shock waves and electrochemical couples. important It is necessary to guarantee a prolonged good operation of the device operating according to the present invention that the mechanical part forming Ventun is made of a metal or any other material resistant to this phenomenon.
• An alloy based on special cast iron or steel trarte can commonly obtain more than a year in continuous operation without significant deterioration in the quality or activity of the foam produced
• the cavitation phenomenon of essentially producing near the walls, the atomization of the bubbles and the resulting liquid have essentially radial components which ensure a chaotic movement of the central part of the chamber 4, moreover, the cavrtation generates waves ultrasound reflected by the walls and whose energy is absorbed by the mixture and participates in chaotic mixing
• the pressure can be generated by various means such as a pressurized gas tank, a pyrotechnic generator or a steam generator
• FIG. 4 One of the embodiments is shown diagrammatically in FIG. 4
• the operation is obtained by action of a pyrotechnic charge in the chamber 25 which generates by the chamber 24 the quantity of gas required and allows the active products contained to be mixed in the casing 26 with the liquid contained in the chamber 23
• the liquid is contained in a reservoir 23 whose wall is thick enough to undergo a notable increase in pressure
• the chamber 25 has openings adapted to deliver a nominal pressure, which allows the establishment of a rapid combustion regime at high pressure ensuring the combustion of the entire product, the high pressure gases are released into the chamber 24.
• This tank comprises, at its upper part a valve 37 allowing the liquid to be purged or mixed by admitting air from a gas tank under pressure
• the active products are contained in the tearable envelope 26 in the form of powder or liquid.
• the envelope 26 is made of a material which, by the play of variable thicknesses or fragile points on its surface, makes it possible to ensure the rupture of the seal in order to facilitate the passage of the liquid and to optimize the mixing and diluting the produrt in the liquid.
• These products can be left immersed in the liquid in the reservoir 23.
• the liquid can be discharged into the venturi tube 22 via a pipe 34 through a thermostatic mixing valve 33
• the valve 33 makes it possible to maintain an almost constant temperature during of use
• pressure regulators 31, 32 are mounted in bypass on the valve 33 so that the temperature and the pressure of the liquid are controlled.
• the volume of foam leaving the device is approximately five times higher than in the devices currently in use
• the opening of the lance outlet 35 causes the liquid ⁇ ui to move around the casing 26 in a helical movement promoting heat exchange
• This embodiment can also be provided with a device for pressurizing the gases to supply the inlet of the ventu ⁇ and adapt the nature of the gas to the desired action.
• the device can be fitted with a quick coupling fitted with a valve 38 calibrated in pressure to ensure gas feeding at the inlet of the venturi, of the pressure regulator 40 through the pipe 39
• the present invention also relates to an apparatus for dispersing macrobubbles of gas in a liquid by also using the device dec ⁇ t above.
• the venturi is placed in a liquid line 25
• the main applications of the process concern the use as water fluid with a sufficient percentage of active products for specific actions:
• Detergent products whether or not mixed with solvents of all types depending on the application, with an advantage given, according to the invention, to polar or ionic compounds as well as to surfactants for cleaning applications,
• Pollution neutralization products and in particular enzymes or proteins specific to certain chemical actions on organic products and which can preferably be mixed, according to the invention, with solvents and destructuring products (in the event of polyme ⁇ sée pollution) or surfactants
• Another application of the device is to use its low pressure capacity which can be greater than 1 bar. Such a device therefore becomes the pnn ⁇ pal element of a pump.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Nozzles (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (7)

Publications (2)

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Country Status (6)

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• 1997
  • 1997-07-01 EP EP97931836A patent/EP0869841B1/de not_active Expired - Lifetime
  • 1997-07-01 WO PCT/FR1997/001167 patent/WO1998000227A1/fr not_active Ceased
  • 1997-07-01 AT AT97931836T patent/ATE242044T1/de not_active IP Right Cessation
  • 1997-07-01 US US09/029,417 patent/US6042089A/en not_active Expired - Fee Related
  • 1997-07-01 CA CA002231338A patent/CA2231338A1/fr not_active Abandoned
  • 1997-07-01 DE DE69722583T patent/DE69722583D1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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