EP3383551B1 - Vorrichtung zum versprühen basiert auf einem piezoelektrischen aktuator gekoppelt mit einem akustischen konzentrator, mit internen flüssigkeitspegeldetektion - Google Patents

Vorrichtung zum versprühen basiert auf einem piezoelektrischen aktuator gekoppelt mit einem akustischen konzentrator, mit internen flüssigkeitspegeldetektion Download PDF

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Publication number
EP3383551B1
EP3383551B1 EP16819135.1A EP16819135A EP3383551B1 EP 3383551 B1 EP3383551 B1 EP 3383551B1 EP 16819135 A EP16819135 A EP 16819135A EP 3383551 B1 EP3383551 B1 EP 3383551B1
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Prior art keywords
liquid
piezoelectric element
value
representative
active surface
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English (en)
French (fr)
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EP3383551A1 (de
Inventor
Michel Gschwind
Abbas SABRAOUI
Frédéric Richard
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Areco Finances et Technologie ARFITEC SAS
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Areco Finances et Technologie ARFITEC SAS
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    • 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
    • B05B17/0607—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 generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0615—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 generated by electrical means, e.g. piezoelectric transducers spray being produced at the free surface of the liquid or other fluent material in a container and subjected to the vibrations
    • 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
    • B05B12/081—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 the weight of a reservoir or container for liquid or other fluent material; responsive to level or volume of liquid or other fluent material in a reservoir or container
    • 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
    • B05B17/0607—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 generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0653—Details
    • B05B17/0669—Excitation frequencies
    • 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
    • B05B17/0607—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 generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0653—Details
    • B05B17/0676—Feeding means

Definitions

  • the invention relates to the technical field of spray devices capable of producing a mist of micro-droplets from a liquid.
  • the droplets are generated by a piezoelectric element coupled to an acoustic concentrator. More specifically, the invention relates to such a device comprising detection of the level of the liquid to be sprayed.
  • Spray devices capable of producing a mist of micro-droplets from a liquid by piezoelectric excitation are known as such.
  • the piezoelectric element can be associated with a micro-perforated membrane or with an acoustic concentrator in order to promote the production of fog.
  • the piezoelectric transducer is coupled to a micro-perforated membrane, which is in contact with the liquid to be sprayed.
  • WO 2013/110248 Nebu Tec
  • WO 2012/020262 and WO 05/15822 Technology Partnership
  • EP 2 244 314 Zerobele Holding
  • US 2006/213503 and US 2005/224076 Parenter
  • WO 2001/85240 Pezzopane
  • FR 2 929 861 L'Oréal
  • US 8,870,090 Aptar
  • WO 2008/058941 Telemaq
  • JP 2001/300375 Panasonic
  • the piezoelectric transducer is coupled directly to the liquid to be sprayed, with which it is in contact. More precisely, these systems generally use a tank provided with a concentration nozzle and a piezoelectric element, as described for example in the documents EP 0 691 162 A1 and EP 0 782 885 A1 (IMRA Europe). These devices are very reliable and are commonly used for humidifying and cooling fresh produce on sales stalls, as described in the documents. FR 2 899 135 A1 , FR 2 921 551 A1 , WO 2014/023907 A1 , WO 2013/034847 A1 (ARECO), FR 2 690 510 A1 (Techsonic).
  • these devices do not run the risk of being disturbed in their operation by clogging problems; they have an average lifespan of 5000 hours.
  • these devices have a significant size which is mainly related to the thickness of water necessary for the proper functioning of the piezoelectric element (generally from 20 to 35 mm) and also to the height of the diffusion chamber necessary for the creation of an almost vertical and very powerful acoustic jet (generally 40 to 100 mm).
  • the lack of water can be momentary, for example when the water level of the system moves due to the permanent or occasional movement of the system; this problem can arise for nebulization systems on board vehicles. Lack of water can also be linked to lack of water supply.
  • the water replenishment can be automatic or manual. However, it is known that the flow of mist generated by the system depends, at equal power dissipation, on the water level above the piezoelectric element.
  • piezoelectric excitation nebulization systems are equipped with a water level sensor.
  • These sensors can be of the optical, capacitive, ultrasonic, electromechanical, magnetic, etc. type. They present typically a problem of size, precision, price and reliability. More precisely: the bulkiness of the sensor can become a problem in miniaturized systems. Accuracy can become an issue because many level sensors have a low trigger point and a high trigger point. Price can become a problem with miniaturized systems that open up new applications as long as they are inexpensive. Reliability can become a problem due to the inevitable fouling of the sensor's active surface.
  • the problem which the present invention seeks to solve is to present an improved piezoelectric excitation nebulization system, which exhibits better reliability, allows a more compact construction, less expensive, and a better precision of adjustment, and which lends itself in particular to applications. miniaturized systems.
  • the inventors have found that the problem posed can be surprisingly solved without resorting to a liquid level sensor, by making use of the piezoelectric element itself as a means of detecting the liquid. Indeed, the inventors have observed a link between the characteristics of the nebulization jet and the current consumption of the piezoelectric element.
  • a parameter representative of the current consumed by the piezoelectric element is measured.
  • This parameter can be the current consumed itself.
  • it may be a quantity, such as the voltage, from which a person skilled in the art can access the current consumed.
  • the figure 1 shows the system 1 according to the invention in a normal operating situation, that is to say with a so-called appropriate or optimal liquid level Iopt.
  • the system 1 comprises a tank 10, forming a container, a piezoelectric element 20 and an acoustic concentrator 30.
  • the piezoelectric element 20 is generally in the form of a circular shaped wafer. In the example of figure 1 it is arranged vertically, its active surface (here also called “emitting face”) 21 being oriented in the direction of the acoustic concentrator 30.
  • the angle formed by the horizontal and the main direction of the aforementioned active surface is denoted by ⁇ . In the example illustrated, this angle has a value of 90 °.
  • this angle ⁇ is between 45 ° and 135 °, it can for example be between 70 and 110 °.
  • This element 20 generates ultrasonic waves 40 which are emitted in the direction of the acoustic concentrator 30.
  • the latter may have a parabolic or other shape; its focal point here bears the reference 50.
  • the acoustic concentrator 30 is advantageously made of a hard material (for example metallic) capable of reflecting ultrasound waves.
  • the frequency of the ultrasounds used in the context of the present invention is advantageously between 1.3 MHz and 3 MHz, it can be for example 1.68 MHz.
  • the active surface 21 of the piezoelectric element 20 is completely covered with liquid and the ultrasounds 40 are emitted into the liquid where they impact against the surface of the acoustic concentrator 30.
  • the latter is designed in such a way, and the liquid level is adjusted so that the focal point 50 of the ultrasound 40 is located slightly below the liquid level Iopt . This ensures a stable nebulization jet 70 and a maximum generation of mist 60.
  • the operation of the system is optimal.
  • the current consumption of the piezoelectric element 20 is stable and varies linearly with the applied voltage. In a functional case given here by way of example, the voltage applied to the excitation card is 12 volts (V), the current required corresponds to 400 milliamperes (mA).
  • the figure 2 shows the same system as the figure 1 , but with a liquid level Iint , called intermediate, which is abnormally low: the liquid no longer covers the whole of the active surface 21 of the piezoelectric element 20.
  • This has two consequences: first of all, knowing that the point focal 50 of the acoustic waves 40 is now located above the intermediate liquid level Iint , the waves generate a jet of liquid 70, but little fog 60.
  • the non-submerged part 22 of the active surface 21 emits only a negligible part of the air.
  • electrical power absorbed in the form of ultrasound the remainder is reflected on the surface of the non-submerged part 22 and dissipated in heat.
  • this heating modifies the power consumption of the piezoelectric element 20, as will be detailed with reference to figure 8 . More precisely, this heating modifies the current absorbed; this difference amounts to a few percent, but it is sufficient to be detected.
  • the piezoelectric element 20 is powered by fixed voltage pulse trains, these pulses being close to the resonant frequency of the piezoelectric element 20.
  • the current absorbed by the piezoelectric element 20 it is noted that this current increases with temperature.
  • the piezoelectric element was supplied with a voltage of 12 volts and the absorbed current was 400 mA in normal operation; this current is 440 mA when part of the active surface of the piezoelectric element is not immersed.
  • the inventors observed that when the non-submerged part of the active surface of the piezoelectric element 20 increases, the absorbed current decreases and passes to a value close to zero in the total absence of liquid ( figure 3 ).
  • the piezoelectric element 20 cannot emit in the air as in the liquid, its impedance is therefore limited and its current consumption is much lower than that Iopt in optimal mode as well as that Iint in intermediate mode.
  • the figure 8 summarizes the variation of the current consumed I as a function of the height H of liquid in the tank. More precisely, the percentage of the height of the active surface, covered by the liquid, is plotted on the abscissa.
  • the value 0 corresponds to an empty tank ( figure 3 )
  • the value 100 corresponds to the liquid covering the entire active surface ( figure 1 )
  • the value 50 corresponds to the liquid covering half of the height of the active surface ( figure 2 ).
  • the current consumed has a so-called optimal value Iopt , which is also found when the liquid is present in excess (right part of the curve corresponding to the values 110 and 120).
  • Iopt optimal value
  • the value of the current consumed increases slightly, from the optimum value Iopt above to a so-called intermediate value Iint. This value of current consumed is then substantially constant as the liquid level drops, until it drops substantially to a so-called critical value Icrit corresponding to an empty tank of liquid.
  • said liquid can be water, optionally comprising substances (ionic or nonionic) in solution or in dispersion.
  • the water can comprise one or more organic products, miscible or not, such as an alcohol or an essential oil.
  • Each of the curves representing an operating mode, shows the linearity between the voltage applied to the terminals of the piezoelectric element 20 and the current consumed. It follows that this variation in current consumption as a function of the liquid level cannot be used directly to detect the liquid level: a calibration must be carried out.
  • the figure 5 schematically shows a control method which is based on measuring the current and voltage of the piezoelectric element to detect the presence or absence of water and nebulization.
  • the piezoelectric element is supplied with direct current (for example at a voltage of 24 V DC), modulated by the resonant frequency of the piezoelectric element.
  • direct current for example at a voltage of 24 V DC
  • the active surface of the piezoelectric element is completely covered with liquid; the nebulization is operating, and the current consumption is stable (typically at about 2.3 A for a diameter of the active surface of between approximately 10mm and approximately 20mm).
  • the inventors have observed a current drop which is significant and extremely rapid (in less than 100 ms). This drop may be of the order of 30 to 40% of the nominal value of the current absorbed by the piezoelectric element completely covered with liquid (in the example approximately 2.3 A). These indicators make it possible to react quickly in order to cut off the power supply to the piezoelectric element or to reduce the electric power supplied by said power supply to the piezoelectric element, and / or to trigger a new filling of water. Thus it is possible to return to an operating mode in which the active surface is completely immersed.
  • This indicator which is linked to the drop in current observed, can be correlated with a time measurement in order to estimate the nebulization flow rate of our system and possibly trigger alarms in the event of a problem due to the filling or proper functioning of the l. piezoelectric element.
  • the first three steps are typically implemented when the device is used for the first time. Indeed, the intrinsic characteristics of the various piezoelectric elements can vary from one device to another. These steps provide access to knowledge of these characteristics.
  • the voltage A is varied from a minimum operating value to a maximum operating value (for example from 6 V to 12 V), and the value of the current B is measured and recorded for each voltage. These values will be used as a reference to detect the variation of the current during the nebulization and to indicate to the users the presence or absence of water.
  • the voltage A is varied between the above minimum and maximum operating values, and the value of current B is measured and recorded for each voltage. These values will be used as a reference to detect the variation of the current during the nebulization and to indicate to the users the presence or absence of water.
  • the voltage A is varied between the above minimum and maximum operating values, and the value of current B is measured and recorded for each voltage. These values will be used as a reference to detect the variation of the current during the nebulization and to indicate to the users the presence or absence of water.
  • the different values of current consumed for each voltage observed are recorded in the control command of the piezoelectric C.
  • the Iopt values are recorded in particular. , Iint and Icrit as defined above.
  • the value of the current consumed by the piezoelectric element is measured. This measurement can be continuous or, alternatively, regular measurements can be made at an appropriate frequency. As long as the instantaneous value of this current I does not reach the threshold value as shown in figure 8 , there is no feedback. In other words, it is not necessary to add liquid to the tank.
  • the regulation system C makes it possible to control the solenoid valve E ensuring the filling of the tank R when the current consumption of the piezoelectric 20 becomes excessive. More precisely, when the measured instantaneous value of current consumed reaches the threshold value Iint defined above, the regulation system triggers an alert which is directed to the solenoid valve E. The latter then controls the arrival of additional liquid in the tank, which has the effect of lowering the value of the current consumed. The device regains an optimal configuration, as defined above, so that the water inlet is then stopped.
  • the alert triggered by the regulation system may not be transmitted to a solenoid valve, but to a signaling device.
  • the latter then emits a signal perceptible by the user, in particular of visual and / or sound type.
  • the addition of liquid to the tank is, in this case, provided directly by the user and not by a mechanical element of the device.
  • the regulation system C is able to stop the piezoelectric to limit the breakage of the latter when it detects a low consumption of the current by the piezoelectric element 20.
  • the regulation system triggers an alert which is directed to means for automatically cutting the piezoelectric element. This makes it possible to guarantee the mechanical integrity of this element, which would be endangered if this situation of lack of water were to continue.
  • the alert triggered by the regulation system may not be transmitted to cut-off means, but to a signaling device.
  • the latter then emits a signal perceptible by the user, in particular of visual and / or sound type.
  • the stopping of the piezoelectric element is, in this case, ensured directly by the user and not by a mechanical element of the device.
  • both the need for water supply and the need to shut off the piezoelectric element can be served directly to the user.
  • the figure 6 implements an electronic assembly.
  • the assembly is controlled by a card 190, the power supply of which is done remotely by a power supply module 180.
  • the DC voltage supplied can be between 6 and 40 volts.
  • This card is built around the microcontroller 200 allowing the application management of the steps stated above.
  • This microcontroller 200 also manages the connectivity of the input / output modules.
  • This card includes an all-or-nothing (discrete) analog input module 210 and an output module 220. These assemblies are used to control the water supply to the receptacle in the event of an intermediate or empty level or to control the information signal allowing to warn the user of the need to fill the reservoir supplying the receptacle.
  • a sub-assembly 230 is present to constitute the piezoelectric control 25, this one makes it possible to define the excitation frequency, the voltage, the duty cycle. This module also makes it possible to obtain information on the current consumed 260 as well as the temperature 270 of the piezoelectric 20.
  • the last module 240 of this card 190 is the control and command element of the piezoelectric.
  • This module is the interface allowing the sending of the voltage signal making it possible to excite the piezoelectric 20 and in return to obtain the temperature of said element 20.
  • the card 100 is built around the microcontroller, which has the role of managing the signal generator and subsequently the piezoelectric control.
  • Card 100 also has a 12V switching regulator for controlling the transistor via the driver (120), and a 5V linear regulator for adapting the input control signal.
  • the principle of the driver (120) is to be able to supply for a short time the large current necessary for switching the transistor 130 at high frequencies.
  • the inrush current of the control of the transistor 130 is very high, and supplying sufficient current allows rapid switching, limiting the transient states causing heating of the transistor 130.
  • the transistor driver 120 uses several capacitors in parallel upstream of the component.
  • the control voltage of the transistor is fixed at 12V, thus minimizing the effect of its Ron characteristic and therefore the heating of the component.
  • the excitation frequency of the piezoelectric 20 is generated by the component 110, which produces a square wave of programmable frequency (by default 1.7 MHz).
  • the impedance matching circuit 140 of the piezoelectric 20 consists of a coil and a capacitor in series with a capacitor in parallel on the output.
  • the value of the impedance of the piezoelectric element will change and introduce an electrical impedance mismatch to the entire circuit and subsequently change its current consumption.
  • the piezoelectric 20 is driven by a transistor 130, having an excellent control load and on-state resistance ratio, and a very fast response time allowing it to operate at high frequency (1.7 MHz), allowing both a good signal and a moderate warm-up.
  • a control driver 120 capable of delivering up to 2 x 5A is placed upstream.
  • the current measurements 150 are performed using a low value shunt resistor, between 0.01 and 0.1 ohm depending on the current consumed, and a voltmeter type component measuring the potential difference across the resistor and multiplying by 10 the result in order to have a more readable value for the microcontroller.
  • the microcontroller subsequently will compare the values of the current drawn in order to define the operating state of the piezoelectric. This state will enable the process step to be validated.

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Claims (15)

  1. Sprühvorrichtung (1) mit piezoelektrischer Anregung, umfassend:
    - einen Flüssigkeitsbehälter (10),
    - ein piezoelektrisches Element (20), das mindestens teilweise im Innenvolumen des Behälters angeordnet ist, wobei dieses Element (20) eine aktive Fläche (21) aufweist, die imstande ist, Schallwellen in die Flüssigkeit zu senden, wenn diese aktive Fläche mindestens teilweise mit Flüssigkeit bedeckt ist, zwecks Versprühens dieser Flüssigkeit,
    wobei diese Vorrichtung dadurch gekennzeichnet ist, dass sie ferner umfasst:
    - Messmittel, die imstande sind, einen repräsentativen Parameter des von dem piezoelektrischen Element (20) verbrauchten Stroms zu messen;
    - Warnmittel, die imstande sind, in Antwort auf die Messmittel aktiviert zu werden, wenn sich der Momentanwert des repräsentativen Parameters außerhalb eines vorher festgelegten Bereichs befindet.
  2. Sprühvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass sie ferner erste Steuermittel umfasst, die imstande sind, in Antwort auf die Warnmittel Ankunftsmittel von Flüssigkeit in den Behälter zu aktivieren.
  3. Sprühvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie ferner zweite Steuermittel umfasst, die imstande sind, in Antwort auf die Warnmittel Stoppmittel des piezoelektrischen Elements zu aktivieren.
  4. Sprühvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie ferner mindestens eine Warneinrichtung umfasst, die imstande ist, in Antwort auf die Warnmittel mindestens ein von einem Benutzer wahrnehmbares Signal zu senden.
  5. Sprühvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Versorgungsmittel mit Flüssigkeit ein Elektroventil umfassen.
  6. Sprühvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die aktive Fläche (21) des piezoelektrischen Elements (20) in Bezug auf die Horizontale in einem Winkel (α), der zwischen 45° und 135° liegt, insbesondere in einem Winkel von 90° geneigt ist.
  7. Verfahren zur Umsetzung einer Sprühvorrichtung (1) nach einem der Ansprüche 1 bis 6, umfassend:
    - einen Flüssigkeitsbehälter (10), wobei die Flüssigkeit vorzugsweise Wasser ist, das eventuell gelöste oder dispergierte Substanzen umfasst und insbesondere ein oder mehrere organische Produkte, die mischbar sind oder nicht;
    - ein piezoelektrisches Element (20), das mindestens teilweise im Innenvolumen des Behälters angeordnet ist, wobei dieses Element (20) eine aktive Fläche (21) aufweist, die imstande ist, Schallwellen in die Flüssigkeit zwecks Versprühens dieser Flüssigkeit zu senden;
    - Messmittel, die imstande sind, einen repräsentativen Parameter des von dem piezoelektrischen Element (20) verbrauchten Stroms zu messen;
    - Warnmittel, die imstande sind, in Antwort auf die Messmittel aktiviert zu werden, wenn sich der Momentanwert des repräsentativen Parameters außerhalb eines vorher festgelegten Bereichs befindet;
    wobei dieses Verfahren die folgenden Schritte umfasst:
    - Messen eines repräsentativen Parameters des von dem piezoelektrischen Element (20) verbrauchten Stroms;
    - Aktivieren der Warnmittel, wenn sich der Momentanwert des repräsentativen Parameters außerhalb eines vorher festgelegten Bereichs befindet.
  8. Verfahren nach Anspruch 7 zur Umsetzung einer Vorrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass die ersten Steuermittel derart aktiviert werden, dass eine Ankunft von Flüssigkeit in den Behälter hervorgerufen wird, wenn der Momentanwert des repräsentativen Parameters einen ersten vorher festgelegten Wert, bezeichnet als oberer Grenzwert (Iint), erreicht.
  9. Verfahren nach Anspruch 7 zur Umsetzung einer Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass dank der Warneinrichtung ein erster Signaltyp gesendet wird, wenn der Momentanwert des repräsentativen Parameters einen ersten vorher festgelegten Wert, bezeichnet als oberer Grenzwert (Iint), erreicht.
  10. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der erste vorher festgelegte Wert in Abhängigkeit von einem als optimal bezeichneten Wert (Iopt) des Parameters bestimmt wird, der einer Umsetzung der Vorrichtung entspricht, bei der die aktive Fläche (21) vollständig mit Flüssigkeit bedeckt ist.
  11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass der vorher festgelegten Wert zwischen 110 % und 120 % des optimalen Werts liegt.
  12. Verfahren nach einem der Ansprüche 7 bis 11, dadurch gekennzeichnet, dass es ferner einen anderen Kalibrierschritt umfasst, bei dem die Schwankung des verbrauchten Stroms in Abhängigkeit von der Spannung an den Klemmen des piezoelektrischen Elements in einem als kritisch bezeichneten Zustand der Vorrichtung bestimmt wird, für den die aktive Fläche überhaupt nicht mit Flüssigkeit bedeckt ist.
  13. Verfahren nach einem der Ansprüche 7 bis 12 zur Umsetzung einer Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass zweite Steuermittel derart aktiviert werden, dass das piezoelektrische Element gestoppt wird, wenn der Momentanwert des repräsentativen Parameters einen zweiten, vorher festgelegten Wert, bezeichnet als unterer Grenzwert (Icrit), erreicht.
  14. Verfahren nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, dass der repräsentative Parameter des von dem piezoelektrischen Element verbrauchten Stroms der von dem piezoelektrischen Element verbrauchte Strom ist.
  15. Verfahren nach einem der Ansprüche 7 bis 14, dadurch gekennzeichnet, dass der Flüssigkeitspegel derart eingestellt wird, dass sich der Fokalpunkt (50) des Ultraschalls unterhalb des Flüssigkeitspegels befindet.
EP16819135.1A 2015-11-30 2016-11-30 Vorrichtung zum versprühen basiert auf einem piezoelektrischen aktuator gekoppelt mit einem akustischen konzentrator, mit internen flüssigkeitspegeldetektion Active EP3383551B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1502493A FR3044242B1 (fr) 2015-11-30 2015-11-30 Dispositif de pulverisation a transducteur piezoelectrique couple a un concentrateur acoustique, avec detecteur du niveau de liquide interne
PCT/FR2016/053138 WO2017093655A1 (fr) 2015-11-30 2016-11-30 Dispositif de pulverisation a transducteur piezoelectrique couple a un concentrateur acoustique, avec detection du niveau de liquide interne

Publications (2)

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EP3383551A1 EP3383551A1 (de) 2018-10-10
EP3383551B1 true EP3383551B1 (de) 2021-05-05

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US (1) US20190070626A1 (de)
EP (1) EP3383551B1 (de)
FR (1) FR3044242B1 (de)
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FR3124893B1 (fr) 2021-07-01 2023-10-27 Areco Finances Et Tech Arfitec Element piezoelectrique pour nebulisateur, avec une duree de vie amelioree

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CS550488A3 (en) * 1987-08-17 1992-11-18 Satronic Ag Ultrasonic generator circuitry
DE19962280A1 (de) * 1999-12-23 2001-07-12 Draeger Medizintech Gmbh Ultraschallvernebler
WO2006095816A1 (ja) * 2005-03-11 2006-09-14 Akira Tomono 霧発生装置、および、霧放出演出装置
BRPI0819260B1 (pt) * 2007-11-06 2019-11-12 Panasonic Corp refrigerador
US20110259974A1 (en) * 2009-12-04 2011-10-27 Mt Industries, Inc. Base unit for hand held skin treatment spray system

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FR3044242B1 (fr) 2017-12-15
EP3383551A1 (de) 2018-10-10
FR3044242A1 (fr) 2017-06-02
US20190070626A1 (en) 2019-03-07
WO2017093655A1 (fr) 2017-06-08

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