Classifications

• • 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
  • B05B7/0433—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 gas surrounded by an external conduit of liquid upstream the mixing chamber
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
  • A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
  • A61L2/22—Phase substances, e.g. smokes, aerosols or sprayed or atomised substances
• • 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
  • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
  • A61L2209/10—Apparatus features
  • A61L2209/15—Supporting means, e.g. stands, hooks, holes for hanging

Definitions

• the present invention relates to a fractionation injector, in particular intended to equip injection devices of the type used on decontamination apparatus by misting a disinfection product on surfaces to be treated, and in particular on the walls of a housing. local area and the different devices and instruments contained in it.
• the present invention also relates to misting devices able to generate and propel in the room to be treated fine droplets forming therein a type of mist called "dry fog".
• the size of the drops formed is relatively high (of the order of 80 to 200 microns for an air flow rate of 3 to 5 ml of air per minute), so that these drops are deposited by simple effect of gravity on the surfaces close to their place of spraying, which, of course, is not satisfactory to the extent that surfaces remote from the spray nozzle are untreated.
• the injection device according to patent FR 2 859 650 comprises: a secondary vein connected to means for supplying said liquid and comprising means for producing a first fractionation of said liquid and an expansion chamber,
• a main stream connected to means for generating a gas flow comprising means for performing a second fractionation of said liquid and an outlet orifice to the atmosphere,
• the injection device is provided with an ultrasonic "resonator" disposed downstream of the exit of the injector, so that the flow output of it is subject to fragmentation forming a kind of "diffraction" of the drops, having the effect of making them even smaller, which allows to further increase the homogeneity of their distribution.
• Such an injection device if it allows to distribute regularly throughout the volume of a local fine droplets of the treatment product, however, has certain disadvantages.
• the ultrasonic resonator disposed downstream of the outlet of the injector must of course be held in position by a support connected to the spraying device.
• this support had the effect of causing an uncontrolled diffusion of the spray jet output that harmed the good regularity of it.
• the support is as thin as possible, but this makes it particularly vulnerable to shocks and other stresses to which it is subjected during use, so much so that its position at the head of the device further increases this vulnerability.
• droplets of the spray liquid accumulate on the support, and contribute to the formation of drops of liquid which are sprayed with the fine droplets of the main jet.
• the presence of the resonator at the head of the injector prevents the integration thereof into certain processing machines in which it is desired to have a total embedding of the spray means.
• the object of the present invention is to propose a spray injector capable of generating a dry mist and of distributing it in a homogeneous and regular manner in ⁇
• the subject of the present invention is thus a fractionation injector, in particular for a venturi-type misting device, of the type comprising a main vein successively constituted by a convergent axial vein intended to receive a stream of gas under pressure, a cylindrical vein, and a divergent axial vein, said injector further comprising at least one secondary vein, substantially transverse, intended to admit a flow of treatment liquid, and which opens downstream of the convergent vein, characterized in that the axis of the cylindrical vein is angularly offset with respect to the longitudinal axis of the convergent and divergent veins.
• the secondary vein will open into the upstream part of the divergent vein.
• the angular offset will be between 2 ° and 8 ° and will preferably be close to 4 °.
• the respective lengths of the convergent vein and the diverging vein will preferably be substantially equal.
• the length of the cylindrical vein it may be equal to about half the length of the convergent vein and, more precisely, of the order of 0.4 times this one.
• the conicity of the convergent may be between 40 ° and 50 ° and will preferably be close to 46 ° and the conicity of the divergent may be between 10 ° and 20 ° and will preferably be close to 15 °.
• the diameter of the cylindrical vein connecting the convergent and the divergent may be between 0.9 and 1.5 mm and preferably be close to 1.3 mm.
• the present invention also aims to provide an injection device capable of implementing such an injector.
• the subject of the present invention is thus an injection device of the type comprising a body pierced with a cylindrical axial channel supplied at one of its ends by a gaseous flow under pressure and receiving at its other end a fractionating injector. as described above, said body being provided with at least one intake duct of a treatment liquid opening into a distribution chamber in communication with the secondary vein of the injector.
• the axis of the intake duct will be substantially perpendicular to the longitudinal axis of the axial duct.
• the intake duct of the treatment liquid will advantageously be provided, in its downstream part, with a calibrated orifice for flow control.
• the distribution chamber may be formed between the outer surface of an insert resting on the injector which will be pierced with an axial gaseous supply channel thereof, and the inner surface a chambering made in the body.
• Another object of the present invention is to provide an autonomous misting apparatus capable, after a given operating time in a room, of eradicating any bacterial germ both in the atmosphere and on the surfaces of the walls and objects thereof. .
• the present invention thus also relates to a misting apparatus comprising a fractionation injector of the type described above, disposed in an injection device and comprising means for pressurizing the air flow supplying the main stream of the injector. which are controlled by electronic control means, and means for feeding the vein secondary treatment liquid of which at least the volume to be dispensed during a treatment operation is measured by said electronic control means.
• the electronic control means may consist of a microcontroller
• the treatment liquid supply means may be constituted by a metering pump capable of taking from a storage tank of the treatment liquid a determined volume of the latter. and to deliver it to a temporary storage tank from which it will be sucked by the venturi effect from said secondary vein of the injector.
• the present invention also relates to the application of a misting apparatus as mentioned above, the spraying in a room to be treated with a treatment product having at least one decontamination effect.
• FIG. 1 is a diametrical sectional view of a fractionation injector according to the invention
• FIG. 2a is a longitudinal sectional view of an injection device used in a misting apparatus according to the invention, using an injector of the type shown in FIG. 1,
• FIG. 2b is a perspective view of the injection device represented in FIG. 2a;
• FIG. 3 is a curve representing the flow rate respectively delivered by an injection device according to the prior art and by a device for injection; injection according to the invention, depending on the pressure of the propellant gas in the main vein,
• FIG. 4 is a representation in schematic form of a misting apparatus according to the invention implementing an injection device of the type shown in FIGS. 2a and 2b,
• FIG. 5 is a curve representing the speed of the gas / liquid flow at the outlet of an injector according to the invention as a function of the angle formed by the axis of the cylindrical part thereof with the longitudinal axis of the converge and diverge from the injector.
• FIG. 1 shows a fractionation injector 1 according to the invention, which is formed of a cylindrical body of longitudinal axis xx 'and whose anterior face is of smaller diameter.
• the injector 1 is traversed from one side by a venturi type longitudinal flow vein, comprising three parts, namely a convergent 3, followed by a cylindrical portion 5 which is extended by a diverging opening 7 on the outside .
• the conicity of the convergent 3 is 46 ° and its inlet has a diameter of 4.78 mm.
• the cylindrical portion 5 extending the convergent 3 has a diameter of 1.3 mm and the diverging 7 extending thereof has a taper of 15 ° and an outlet of 2.27 mm.
• the convergent 3 and the divergent 7 have their respective axes which merge with the longitudinal axis xx 'of the injector 1.
• the cylindrical portion 5 has its axis zz' which is angularly offset with respect to the longitudinal axis xx 'and forms therewith an angle ⁇ whose value, in the present embodiment of the invention, is preferably of the order of 4 ° but which can be understood, depending on the uses, between 2 ° and 8 °.
• transverse channels 9 of which there are four in the present embodiment, but it could also be possible to use a single channel or, on the contrary, a larger number of channels. .
• These channels 9, which open into the main stream downstream of the cylindrical portion 5, are in communication with liquid supply and flow control means that it is desired to distribute, as explained below.
• the propellant gas which most of the time may consist of air but which could also, for certain specific applications, be made of any other gas, is pressurized, for example by means of a compressor capable of applying at the inlet of the venturi a pressure of the order of 3.10 5 Pa in the present example, then brought to the inlet of the convergent 3 in which, in known manner, it undergoes an increase in its speed and a decrease in its pressure by venturi effect , so that at the outlet of the cylindrical portion 5 the liquid to be dispensed is sucked by the transverse channels 9 to be projected into the room, mixed with the propellant.
• a compressor capable of applying at the inlet of the venturi a pressure of the order of 3.10 5 Pa in the present example
• the angular offset ⁇ of the axis zz 'of the cylindrical portion 5 relative to the axis xx' of the convergent 3 and of the divergent portion 7 has the effect of creating a splitting particularly effective droplets suspended in the gas stream.
• FIGS. 2a and 2b show an injection device using such a fractionation injector according to the invention.
• This device comprises a body 11 at the front of which is screwed an injector body 13 in which is positioned an injector 1 according to the invention, so that the longitudinal axis xx 'thereof is merged with that of the body 11.
• the injector body 11 is pierced with a central and longitudinal channel 12 in which takes place a cylindrical spacer 14 which keeps the injector 1 in position.
• This spacer is pierced with a central and longitudinal channel 15 of the same diameter as the inlet of the convergent 3 and which, at one of its ends, opens into the latter, and at its other end is supplied with gas under pressure by an intake nozzle 17.
• the median part of the body 11 is hollowed out with a bore 19 making it possible to create between the inner surface thereof and the outer surface of the spacer 14 a distribution chamber 21 which is in communication, via longitudinal channels 22, with the transverse channels 9 of the injector 1.
• the middle part of the body 1 is also pierced with transverse threaded holes in which its screw-fastened two tubular elements 23 for supplying treatment liquid which are arranged symmetrically with respect to the longitudinal axis xx 'of the body 11.
• These tubular elements are pierced with a central channel 25 which opens into the distribution chamber 21 and which ends with a calibrated stream 27 for controlling the flow of the treatment liquid admitted into the distribution chamber 21.
• the two calibrated veins 27 may for example have different passage sections, in particular of the order of 0.15 mm 2 and 0.60 mm 2 , thus making it possible to use one or the other or the two calibrated veins, which makes it possible to have - an overall passage section of 0.15 mm 2 , 0.60 mm 2 , or 0.75 mm 2 .
• the gas arriving via the central vein passes through the convergent 3 in which it undergoes a decrease in pressure by the venturi effect, then the cylindrical part 5 in which, because of the misalignment of the latter, it is subjected to vortices generating during suction of liquid through the transverse channels 9, a further fractionation of the liquid admitted.
• the fractionation thus produced by means of the injector 1 according to the invention makes it possible to generate a mist whose droplets which form it are extremely fine and which, moreover, are distributed homogeneously in the space without agglomeration between them so that they form a dry fog.
• FIG. 5 shows the variation of the speed of the liquid / gas flow at the outlet of the injector, as a function of the angle ⁇ formed by the axis of the cylindrical portion 5 of the injector with the longitudinal axis xx 'thereof. It can be seen that, in the present embodiment, if the speed passes through a maximum for an ⁇ offset of 4 °, a speed increase is also obtained for shifts of between 2 ° and 8 °.
• the present invention is also particularly interesting in that it makes it possible, in particular because of the suppression of the resonator, to reduce the pressure of the propellant gas in the main vein.
• the optimum operating pressure in the main vein is generally between 2.8.10 5 Pa and 3.2.10 5 Pa
• this pressure in the injector according to the invention is between 1 5.10 5 Pa and 3.5.10 5 Pa and preferably close to 2.10 5 Pa. Note that such a provision has significant advantages.
• the present invention makes it possible to improve in a particularly efficient way the regularity of operation of the devices of this type, making it possible in particular to avoid a number of adjustments and adjustments which, in the meantime, were imperatively to be carried out in situ.
• FIG. 4 shows schematically an example of a misting apparatus implementing an injection device using a fractionation injector according to the invention.
• the rear part of the injection device 11 is supplied with pressurized air by a compressor 30 which is controlled by electronic control means such as in particular a microcontroller 32.
• This microcontroller is interface with a control panel
• the treatment liquid is stored in a cartridge
• the volume V determined as necessary for the processing operation to be performed by the microcontroller 32 is taken by means of a metering pump 36, for example a peristaltic pump, whose operation is controlled by the microcontroller 32, for delivered to a temporary storage tank 38.
• a metering pump 36 for example a peristaltic pump
• the microcontroller 32 controls the start-up of the compressor 30 in order to start the processing and, when the tank 38 is emptied, the microcontroller stops.
• the injector according to the invention could be used with decontamination devices of different structure and layout. It could also find applications in areas other than decontamination, and could be used in a variety of applications where it is necessary to generate tiny droplets that can form a dry fog.

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• Health & Medical Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Nozzles (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)
• Apparatus For Disinfection Or Sterilisation (AREA)

Applications Claiming Priority (2)

Publications (1)

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Cited By (1)

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• 2009
  • 2009-01-13 FR FR0900134A patent/FR2940923B1/fr not_active Expired - Fee Related
• 2010
  • 2010-01-12 EP EP10702520A patent/EP2496363A1/de not_active Withdrawn
  • 2010-01-12 RU RU2011134070/05A patent/RU2011134070A/ru not_active Application Discontinuation
  • 2010-01-12 BR BRPI1007368A patent/BRPI1007368A2/pt not_active IP Right Cessation
  • 2010-01-12 CN CN2010800048354A patent/CN102307669A/zh active Pending
  • 2010-01-12 US US13/144,174 patent/US20110266376A1/en not_active Abandoned
  • 2010-01-12 AU AU2010215339A patent/AU2010215339A1/en not_active Abandoned
  • 2010-01-12 JP JP2011544901A patent/JP2012515071A/ja active Pending
  • 2010-01-12 CA CA2749414A patent/CA2749414A1/en not_active Abandoned
  • 2010-01-12 MX MX2011007481A patent/MX2011007481A/es not_active Application Discontinuation
  • 2010-01-12 WO PCT/FR2010/000022 patent/WO2010094845A1/fr active Application Filing

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