WO2014112447A1 - Atomiseur électrostatique et procédé de commande de l'atomiseur électrostatique - Google Patents

Atomiseur électrostatique et procédé de commande de l'atomiseur électrostatique Download PDF

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Publication number
WO2014112447A1
WO2014112447A1 PCT/JP2014/050372 JP2014050372W WO2014112447A1 WO 2014112447 A1 WO2014112447 A1 WO 2014112447A1 JP 2014050372 W JP2014050372 W JP 2014050372W WO 2014112447 A1 WO2014112447 A1 WO 2014112447A1
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Prior art keywords
electrode
spray
tip
electrostatic spraying
voltage
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PCT/JP2014/050372
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English (en)
Japanese (ja)
Inventor
バン タン ダウ
ティボー テレベシー
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住友化学株式会社
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Publication of WO2014112447A1 publication Critical patent/WO2014112447A1/fr

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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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/0255—Discharge apparatus, e.g. electrostatic spray guns spraying and depositing by electrostatic forces only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/057—Arrangements for discharging liquids or other fluent material without using a gun or nozzle

Definitions

  • the present invention relates to an electrostatic spraying device having excellent spray stability and a method for controlling the electrostatic spraying device.
  • a spraying apparatus that ejects liquid in a container from a nozzle has been applied to a wide range of fields.
  • an electrostatic spraying device that atomizes and sprays a liquid by electrohydrodynamics (EHD) is known.
  • EHD electrohydrodynamics
  • This electrostatic spraying device forms an electric field in the vicinity of the tip of the nozzle, and uses the electric field to atomize and spray the liquid at the tip of the nozzle.
  • Patent Document 1 is known as a document disclosing such an electrostatic spraying device.
  • Patent Document 1 has room for improvement in the following points.
  • the electrostatic spraying device of Patent Document 1 includes a spray electrode and a reference electrode, and each of the spray electrode and the reference electrode is adjacent to a dielectric material.
  • the spray electrode is a conduit for spraying liquid, and has a shape in which a tip portion is cut at a certain angle so as to provide a focus point of an electric field between the spray electrode and the reference electrode. Thereby, the spray electrode becomes sharper toward the tip.
  • the spray electrode and the reference electrode are electrically connected by the droplet, and the spray electrode and the reference electrode are connected by the droplet. Leakage current may occur between the reference electrode and the reference electrode. If leakage current occurs, the amount of liquid sprayed from the electrostatic spray device may become unstable.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide an electrostatic spraying device having excellent spray stability and a control method for the electrostatic spraying device.
  • an electrostatic spraying device includes a first electrode that sprays a substance and has a pointed tip that defines a spraying direction of the substance, Based on the second electrode to which a voltage is applied between the first electrode, the current control means for controlling the current value in the second electrode to a predetermined range, and the current value controlled by the current control means, Voltage applying means for applying a voltage between the first electrode and the second electrode, wherein the tip of the first electrode is at a position off the axis of the first electrode, and When viewed from the axial center of the first electrode, the first electrode is located on the opposite side to the side on which the second electrode is located.
  • an electrostatic spraying device control method includes: the electrostatic spraying device sprays a substance and defines a spray direction of the substance.
  • an electric field is formed between the first electrode and the second electrode by applying a voltage between the first electrode and the second electrode.
  • the first electrode is positively charged and the second electrode is negatively charged (or vice versa).
  • the first electrode sprays a positively charged droplet.
  • the second electrode is ionized negatively by ionizing air in the vicinity of the electrode.
  • the negatively charged air moves away from the second electrode due to the electric field formed between the electrodes and the repulsive force between the negatively charged air particles. This movement generates a flow of air (hereinafter sometimes referred to as an ion flow), and the positively charged droplets are sprayed away from the electrostatic spraying device by the ion flow.
  • the spray substance is sprayed in the direction of the second electrode, that is, in the direction of the electrostatic spraying device to generate a spray back, and the spraying material may adhere to the electrostatic spraying device.
  • the first electrode and the second electrode are electrically connected by the droplet, and the liquid Leakage current may be generated between the first electrode and the second electrode due to the droplet.
  • the amount of liquid sprayed from the electrostatic spraying device may become unstable due to the occurrence of leakage current.
  • the electrostatic spraying device even when the position of the pointed tip that defines the spraying direction of the substance of the first electrode with respect to the second electrode is changed,
  • the current value in the second electrode is controlled within a predetermined range by the current control means.
  • a voltage is applied between the first electrode and the second electrode based on the current value controlled by the current control means. That is, by controlling the current value in the second electrode within a predetermined range, the voltage value applied between the first electrode and the second electrode is stabilized, and as a result, the first electrode and the second electrode The electric field strength during is also stable.
  • the electrostatic spraying device control method
  • the electrostatic spraying device can suppress the spray back to the device itself and suppress the occurrence of leakage current between the first electrode and the second electrode. . Therefore, the electrostatic spray device according to one embodiment of the present invention can maintain spray stability regardless of the position of the tip of the first electrode with respect to the second electrode.
  • the distal end portion of the first electrode is located at a position off the axis of the first electrode and from the axis of the first electrode.
  • the second electrode is located on the opposite side of the side where the second electrode is located.
  • the electrostatic spraying device can spray the substance in a direction away from the first electrode, and reduce spray back to a region between the first electrode and the second electrode. It becomes possible.
  • the electrostatic spraying device can further increase the stability of spraying.
  • the electrostatic spraying device sprays a substance and a voltage is applied between the first electrode having a pointed tip that defines the spraying direction of the substance and the first electrode.
  • Voltage applying means for applying a voltage to the first electrode, the tip of the first electrode is at a position off the axis of the first electrode, and viewed from the axis of the first electrode, It is the structure located in the opposite side to the side in which the said 2nd electrode is located.
  • the electrostatic spraying device sprays a substance and has a first electrode having a pointed tip that defines the spraying direction of the substance, A current control step for controlling the current value in the second electrode to a predetermined range, and a current value controlled in the current control step.
  • the electrostatic spraying device and the control method for the electrostatic spraying device according to the present invention have an effect of providing an electrostatic spraying device having excellent spray stability.
  • FIG. 5 is a top view of first to fourth positions of a tip portion of a spray electrode with respect to a reference electrode. It is a perspective view which shows a mode that the front-end
  • FIG. 1 Spray over time when the tip of the spray electrode is provided at the positions of point a (0 °), point b (90 °), point c (180 °), and point d (270 °) shown in FIG. It is a graph which shows transition of quantity. It is the schematic for demonstrating the spraying direction when the front-end
  • FIG. 1 is a diagram for explaining a main configuration of the electrostatic spraying apparatus 100.
  • the electrostatic spraying device 100 is a device used for spraying aromatic oil, agricultural chemicals, pharmaceuticals, agricultural chemicals, insecticides, air cleaning agents, etc., and at least a spray electrode (first electrode) 1 and a reference An electrode (second electrode) 2, a power supply device 3, and a dielectric 10 are provided.
  • the electrostatic spraying device 100 may be realized by a configuration in which the power supply device 3 is provided outside and connected to the power supply device 3.
  • the spray electrode 1 has a conductive conduit such as a metallic capillary (for example, 304 type stainless steel) and a tip 5 that is a tip.
  • the spray electrode 1 is connected to the reference electrode 2 via the power supply device 3.
  • a spray substance is sprayed from the tip 5.
  • the spray electrode 1 has an inclined surface 9 that is inclined with respect to the axial center of the spray electrode 1, and the tip is narrower and sharper toward the tip.
  • the spray direction of a spray substance is prescribed
  • the reference electrode 2 is made of a conductive rod such as a metal pin (for example, a 304 type steel pin).
  • the spray electrode 1 and the reference electrode 2 are spaced apart from each other at a predetermined interval and are arranged in parallel to each other. Further, the spray electrode 1 and the reference electrode 2 are arranged, for example, at an interval of 8 mm from each other.
  • the power supply device 3 applies a high voltage between the spray electrode 1 and the reference electrode 2.
  • the power supply device 3 applies a high voltage of 1-30 kV (eg, 3-7 kV) between the spray electrode 1 and the reference electrode 2.
  • a high voltage is applied, an electric field is formed between the electrodes, and an electric dipole is generated inside the dielectric 10.
  • the spray electrode 1 is positively charged and the reference electrode 2 is negatively charged (or vice versa).
  • negative dipoles are generated on the surface of the dielectric 10 closest to the positive spray electrode 1, and positive dipoles are generated on the surface of the dielectric 10 closest to the negative reference electrode 2.
  • the charge generated in the reference electrode 2 is a charge having a polarity opposite to the polarity of the spray substance.
  • the charge of the spray material is balanced by the charge generated at the reference electrode 2. Therefore, the electrostatic spraying device 100 can achieve spray stability by current feedback control based on the principle of charge balance. Details thereof will be described later.
  • the dielectric 10 is made of a dielectric material such as nylon 6, nylon 11, nylon 12, nylon 66, or a polyacetyl-polytetrafluoroethylene mixture.
  • the dielectric 10 supports the spray electrode 1 at the spray electrode mounting portion 6 and supports the reference electrode 2 at the reference electrode mounting portion 7.
  • FIG. 2 is a view for explaining the external appearance of the electrostatic spraying device 100.
  • the electrostatic spraying device 100 has a rectangular shape (may have other shapes).
  • a spray electrode 1 and a reference electrode 2 are disposed on one surface of the apparatus.
  • the spray electrode 1 is located in the vicinity of the reference electrode 2.
  • An annular opening 11 is formed so as to surround the spray electrode 1
  • an annular opening 12 is formed so as to surround the reference electrode 2.
  • a voltage is applied between the spray electrode 1 and the reference electrode 2, whereby an electric field is formed between the spray electrode 1 and the reference electrode 2.
  • a positively charged droplet is sprayed from the spray electrode 1.
  • the reference electrode 2 is negatively charged by ionizing air in the vicinity of the electrode.
  • the negatively charged air moves away from the reference electrode 2 due to the electric field formed between the electrodes and the repulsive force between the negatively charged air particles. This movement generates a flow of air (hereinafter also referred to as an ion flow), and positively charged droplets are sprayed in a direction away from the electrostatic spraying device 100 by the ion flow.
  • a flow of air hereinafter also referred to as an ion flow
  • FIG. 3 shows an example of a configuration diagram of the power supply device 3.
  • the power source device 3 includes a power source 21, a high voltage generator (voltage applying means) 22, a monitoring circuit 23 that monitors the output voltage in the currents of the spray electrode 1 and the reference electrode 2, and the current value of the reference electrode 1 as a predetermined value.
  • the control circuit 24 includes a microprocessor 241 that may be designed to further adjust the output voltage and spray time based on other feedback information 25.
  • the feedback information 25 includes environmental conditions (temperature, humidity, and / or atmospheric pressure), liquid amount, arbitrary settings by the user, and the like.
  • the power source 21 can be a well-known power source, and includes a main power source or one or more batteries.
  • the power source 21 is preferably a low voltage power source or a direct current (DC) power source.
  • one battery is formed by combining one or more voltaic batteries. Suitable batteries include AA batteries and AA batteries. The number of batteries depends on the required voltage level and the power consumption of the power source.
  • the high voltage generator 22 includes an oscillator 221, a transformer 222, and a converter circuit 223.
  • the oscillator 221 converts direct current into alternating current, and the transformer 222 is driven with alternating current.
  • a converter circuit 223 is connected to the transformer 222.
  • the converter circuit 223 includes a charge pump and a rectifier circuit.
  • the converter circuit 223 generates a desired voltage and converts alternating current into direct current.
  • a typical converter circuit is a Cockloft-Walton circuit.
  • the monitoring circuit 23 includes a current feedback circuit 231 and may include a voltage feedback circuit 232 depending on applications.
  • the current feedback circuit 231 measures the current value of the reference electrode 2. Since the electrostatic spray device 100 is charge-balanced, the current at the tip of the spray electrode 1 can be accurately monitored by measuring and referring to the current value of the reference electrode 2. According to this method, there is no need to provide an expensive, complicated and confusing measuring means at the tip of the spray electrode 1, and it is not necessary to estimate the contribution of the discharge (corona) current to the measuring current.
  • the current feedback circuit 231 may include any conventional current measuring device such as a current transformer.
  • the current in the reference electrode 2 is measured by measuring the voltage in a set resistor (feedback resistor) connected in series with the reference electrode 2.
  • the measured voltage in the set register is read using an analog to digital (A / D) converter.
  • a / D converter is a part of a microprocessor.
  • a suitable microprocessor with an analog-to-digital converter is a PIC16F18 ** family of microprocessors from Microchip. The digital information is processed by the microprocessor to provide output to the control circuit 24.
  • the voltage measured by the set register is compared with a predetermined constant reference voltage value using a comparator.
  • the comparator requires very low current (generally nanoamperes or less) and has a fast response speed.
  • the microprocessor 241 incorporates a comparator for that purpose.
  • the above-mentioned PIC16F1824 of the microchip family provides a suitable comparator having a very low input current value and a constant reference voltage.
  • the reference voltage value input to the comparator is set using a D / A converter included in the microprocessor 241 and a selectable reference voltage value is prepared. In normal operation, the circuit can detect whether the measured current is higher or lower than the required value determined by the magnitude of the reference voltage and the feedback resistor and provides that information to the control circuit 24.
  • the monitoring circuit 23 is also provided with a voltage feedback circuit 232 and measures the voltage applied to the spray electrode 1.
  • the applied voltage is monitored directly by measuring the voltage at the junction of the two resistors forming a voltage divider connecting the two electrodes.
  • the applied voltage is monitored by measuring the voltage generated at a node in the Cockloft-Walton circuit using similar voltage divider principles.
  • the feedback information is processed through an A / D exchanger or by comparing the feedback signal with a reference voltage value using a comparator.
  • the control circuit 24 acquires information indicating the current value of the reference electrode 2 from the monitoring circuit 23, and compares the current value of the reference electrode 2 with a predetermined current value (for example, 0.867 ⁇ A). Then, if the current value of the reference electrode 2 is not a predetermined current value, the control circuit 24 controls the current value of the reference electrode 2 so as to be a predetermined current value.
  • the control circuit 24 controls the current value of the reference electrode 2 to a predetermined current value, and then sets the amplitude, frequency, or duty cycle of the oscillator 221 and the voltage on / off time (or a combination thereof). By controlling, the output voltage of the high voltage generator 22 is controlled.
  • control circuit 24 sets the current value of the reference electrode 2 to a certain width instead of the “predetermined current value”. Control may be performed so as to be within a predetermined range ( ⁇ 5%).
  • feedback information 25 may be input to the microprocessor 241 because it is necessary to compensate the voltage or duty cycle / spray interval based on the atmospheric temperature, humidity, atmospheric pressure, liquid amount of the sprayed substance, and the like.
  • the information is given as analog information or digital information and is processed by the microprocessor 241.
  • the microprocessor 241 can perform compensation to increase the quality and stability of the spray by changing either the spray interval, the time to turn on the spray, or the applied voltage.
  • the power supply device 3 includes a temperature detection element such as a thermistor used for temperature compensation.
  • the power supply device 3 changes a spray space
  • the spray interval is the total power on / off time.
  • the spray interval can be changed by software built into the microprocessor 241 of the power supply and increases from the set point when the temperature rises and decreases from the set point when the temperature falls.
  • the increase and decrease of the spray interval is preferably according to a predetermined index determined by the characteristics of the substance to be sprayed.
  • the compensation change amount of the spray interval may be limited so that the spray interval changes only between 0-60 ° C. (eg, 10-45 ° C.). For this reason, extreme temperatures recorded by the temperature sensing element are considered erroneous and are not considered, and for high and low temperatures, an acceptable but not optimal spray interval is set.
  • the on / off interval of the spray interval may be adjusted to make the spray interval constant, and the spray time may be increased or decreased within the spray interval when the temperature rises or falls.
  • the power supply device 3 may further include an inspection circuit that detects the characteristics of the substance to be sprayed and generates characteristic information indicating the characteristics of the substance.
  • the characteristic information generated by the inspection circuit is supplied to the control circuit 24.
  • the control circuit 24 uses this characteristic information to compensate at least one voltage control signal.
  • the voltage control signal is a signal generated based on the detection result of ambient environmental conditions (for example, temperature, humidity and / or atmospheric pressure, and / or spray amount), and adjusts the output voltage or spray time. It is a signal for.
  • the power supply device 3 may include a pressure sensor in order to monitor the ambient pressure (atmospheric pressure).
  • the internal configuration of the power supply device 3 has been described above. However, the above description is an example of the power supply device 3, and the power supply device 3 may be realized by other configurations as long as it has the above function.
  • FIG. 4 is a view for explaining the first position of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2.
  • FIG. 5 is a view for explaining the second position of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2.
  • FIG. 6 is a view for explaining the third position of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2.
  • FIG. 7 is a view for explaining the fourth position of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2.
  • FIG. 8 is a top view of the first to fourth positions of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2.
  • the tip 5 of the spray electrode 1 is located closest to the reference electrode 2 as compared to the position of the tip 5 shown in FIGS. 5 to 7 (position indicated by a point a in FIG. 8).
  • the point a is represented as 0 °. This defines the position of the point a as 0 ° with the axis P of the spray electrode 1 as a reference.
  • the tip portion 5 of the spray electrode 1 is located in the middle of the position of the tip portion 5 shown in FIGS. 4 and 6 (the position indicated by the point b in FIG. 8). This indicates that the position rotated by 90 ° from the point a with respect to the axis P of the spray electrode 1 is the point b.
  • the tip 5 of the spray electrode 1 is located farthest from the reference electrode 2 compared to the position of the tip 5 shown in FIGS. 4, 5, and 7 (indicated by a point c in FIG. 8). Position).
  • the point c is represented as 180 °. This indicates that the position rotated by 180 ° from the point a with respect to the axis P of the spray electrode 1 is the point c.
  • the tip 5 of the spray electrode 1 is located in the middle of the position of the tip 5 shown in FIGS. 4 and 6 (the position indicated by the point d in FIG. 8). This indicates that the position rotated by 270 ° from the point a with respect to the axis P of the spray electrode 1 is the point d.
  • FIGS. 9 to 11 are perspective views showing how the position of the tip 5 of the spray electrode 1 with respect to the reference electrode 2 is changed.
  • FIG. 9 is a perspective view showing a state in which the tip portion 5 of the spray electrode 1 is located at a position corresponding to the point b in FIG.
  • FIG. 10 is a perspective view showing a state where the tip portion 5 of the spray electrode 1 is located at a position corresponding to the point c in FIG.
  • FIG. 11 is a perspective view showing a state where the tip portion 5 of the spray electrode 1 is located at a position corresponding to the point d in FIG. 9 to 11, the reference electrode 2 is not shown, but is located on the right side of the drawing.
  • the arrangement of the spray electrode 1 can also be expressed as follows. That is, at the position indicated by the point c in FIG. 8, the tip portion 5 of the spray electrode 1 is located on the opposite side to the side where the reference electrode 2 is located when viewed from the axial center of the spray electrode 1. Further, at the positions indicated by points a, b, and d in FIG. 8 (or the positions excluding the point c when making a round with the points a to b to c to d to a), the tip 5 of the spray electrode 1 is In addition, the spray electrode 1 and the reference electrode 2 are deviated from the line connecting the respective axis centers.
  • the spray electrode 1 it is of course possible to change the position of the tip 5 of the spray electrode 1 with respect to the reference electrode 2 also in the conventional electrostatic spraying apparatus.
  • the electric field strength of the electric field formed between the spray electrode and the reference electrode is weakened by the tip of the spray electrode being moved away from the reference electrode.
  • the spray substance is sprayed in the direction of the reference electrode, that is, the direction of the electrostatic spraying device, and spray back occurs, and the spraying material may adhere to the electrostatic spraying device.
  • the spray electrode and the reference electrode are electrically connected by the droplet, and the spray electrode and the reference electrode are connected by the droplet.
  • Leakage current may occur between the reference electrode and the reference electrode.
  • the amount of liquid sprayed from the electrostatic spraying device may become unstable due to the occurrence of leakage current.
  • the electrostatic spraying device 100 even if the tip portion 5 of the spray electrode 1 is changed to a position away from the reference electrode 2, the current control is performed by the power supply device 3 and the reference is performed. The current value of the electrode 2 is kept constant. Thereby, the voltage applied between the spray electrode 1 and the reference electrode 2 is increased (voltage application step), and the electric field strength between the spray electrode 1 and the reference electrode 2 can be maintained. As a result, the spray back to the electrostatic spraying apparatus 100 is suppressed, and a situation in which a leakage current is generated between the spray electrode 1 and the reference electrode 2 can be avoided.
  • the electrostatic spraying device 100 even if the tip 5 of the spray electrode 1 is changed to a position approaching the reference electrode 2, the current value of the reference electrode 2 is kept constant by receiving current control from the power supply device 3. Kept. Thereby, the voltage applied between the spray electrode 1 and the reference electrode 2 becomes weak, and the electric field strength between the spray electrode 1 and the reference electrode 2 can be maintained. As a result, the electrostatic spraying device 100 can maintain spray stability.
  • the electrostatic spraying device 100 can maintain spray stability regardless of the position of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2.
  • FIG. 12 shows the case where the tip 5 of the spray electrode 1 is provided at the positions of point a (0 °), point b (90 °), point c (180 °), and point d (270 °) shown in FIG.
  • the horizontal axis indicates the elapsed time (days)
  • the vertical axis indicates the spray amount (g / day).
  • One sample when provided at (0 °) was subjected to a spraying experiment. The result of the spray experiment is shown in FIG.
  • the current value of the reference electrode 2 is kept constant by receiving the current control by the power supply device 3. By being. That is, since the current value of the reference electrode 2 is kept constant, the voltage applied between the spray electrode 1 and the reference electrode 2 is controlled, and the electric field strength between the spray electrode 1 and the reference electrode 2 is maintained. By being done.
  • the electrostatic spraying device 100 can appropriately change the arrangement of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2 and can maintain the spray stability. Compared with, the stability of spraying can be improved.
  • FIG. 13 is a schematic view for explaining the spray direction when the tip portion 5 of the spray electrode 1 is positioned on the reference electrode 2 side.
  • FIG. 14 is a schematic diagram for explaining the spray direction when the tip 5 of the spray electrode 1 is located on the side opposite to the reference electrode 2.
  • the spray electrode 1 has an inclined surface 9 that is inclined with respect to the axial center of the spray electrode 1, and becomes thinner toward the tip.
  • the inclination is formed in the upper left direction of the drawing (direction approaching the reference electrode 2).
  • the liquid is sprayed from the spray electrode 1 along the slope, that is, in the direction of the reference electrode 2.
  • the inclination is formed in the upper right direction of the drawing (a direction far from the reference electrode 2).
  • the liquid is sprayed from the spray electrode 1 along the slope, that is, in the direction opposite to the reference electrode 2.
  • the direction in which the liquid is sprayed is defined by the shape of the tip portion 5 of the spray electrode 1 (more specifically, the tilt direction of the tilted surface 9).
  • the reference electrode 2 is located on the right side of each drawing.
  • FIG. 15 is a diagram showing the spray direction of the liquid when the tip 5 of the spray electrode 1 is located at a position corresponding to the point a in FIG. It can be seen that the electric field reflected in white in the figure is in the direction of the reference electrode 2.
  • FIG. 16 is a diagram showing the spraying direction of the liquid when the tip 5 of the spray electrode 1 is located at a position corresponding to the point b in FIG. It can be seen that the focus of the electric field reflected in white in the figure is directed downward (direction perpendicular to the line segment connecting the spray electrode 1 and the reference electrode 2).
  • FIG. 17 is a diagram showing the spray direction of the liquid when the tip 5 of the spray electrode 1 is located at a position corresponding to the point c in FIG. It can be seen that the electric field reflected in white in the figure is in the opposite direction to the reference electrode 2.
  • FIG. 18 is a diagram showing a liquid spraying direction when the tip 5 of the spray electrode 1 is located at a position corresponding to the point d in FIG. It can be seen that the focus of the electric field reflected in white in the figure is directed upward (direction perpendicular to the line segment connecting the spray electrode 1 and the reference electrode 2).
  • the direction in which the liquid is sprayed is defined by the shape of the tip portion 5 of the spray electrode 1, specifically, the inclination direction of the inclined surface 9.
  • FIG. 19 shows a front view of the electrostatic spraying device 100 erected with respect to the ground.
  • the lower side is the direction of gravity.
  • the electrostatic spraying device 100 has a spray electrode 1 and a reference electrode 2 disposed on one surface thereof. As shown in the figure, the spray electrode 1 is located in the vicinity of the reference electrode 2. An annular opening 11 is formed so as to surround the spray electrode 1, and an annular opening 12 is formed so as to surround the reference electrode 2. A voltage is applied between the spray electrode 1 and the reference electrode 2, whereby an electric field is formed between the spray electrode 1 and the reference electrode 2. A positively charged droplet is sprayed from the spray electrode 1.
  • the reference electrode 2 is negatively charged by ionizing air in the vicinity of the electrode. The negatively charged air moves away from the reference electrode 2 due to the electric field formed between the electrodes and the repulsive force between the negatively charged air particles. This movement generates an ion flow, and droplets positively charged by the ion flow are sprayed away from the electrostatic spraying device 100.
  • the tip 5 of the spray electrode 1 is located at the positions indicated by the points a, b, c, and d in FIG. The position at which the spray substance is sprayed back is shown.
  • the spray substance is sprayed from the spray electrode 1 toward the reference electrode 2. Therefore, if the lower side of the drawing is the lower side (the direction of gravity), the region La to be sprayed back is the lower side between the spray electrode 1 and the reference electrode 2.
  • the direction in which the liquid is sprayed is defined by the shape of the tip portion 5 of the spray electrode 1 (more specifically, the inclination direction of the inclined surface 9 (not shown)). Therefore, similarly to the region La, the region Lb, the region Lc, and the region L are determined by the inclination direction of the inclined surface 9 of the distal end portion 5 of the spray electrode 1. Therefore, the region Lb is located below the spray electrode 1, and the region Lc is located on the opposite side of the reference electrode 2 when viewed from the spray electrode 1. The region Ld is located above the spray electrode 1 (in the direction opposite to gravity).
  • the electrostatic spraying device 100 is used for spraying aromatic oil, agricultural chemicals, pharmaceuticals, agricultural chemicals, insecticides, air cleaning chemicals, and the like. Therefore, the relative position between the tip 5 of the spray electrode 1 and the reference electrode 2 may be appropriately changed when there is a suitable direction for the spraying direction of the substance depending on the application. Thereby, a spray substance is sprayed in a more suitable direction, and the spray most suitable for the use of the electrostatic spraying apparatus 100 can be realized.
  • the current value of the reference electrode 2 is kept constant by receiving the current control by the power supply device 3. Since the current value of the reference electrode 2 is kept constant, the voltage applied between the spray electrode 1 and the reference electrode 2 is controlled, and the electric field strength between the spray electrode 1 and the reference electrode 2 is maintained. Is done.
  • the electrostatic spraying device 100 can appropriately change the arrangement of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2 and can maintain the spray stability.
  • the electrostatic spraying device 100 can improve the stability of spraying compared with the conventional electrostatic spraying device.
  • the spray electrode 1 and the reference electrode 2 are electrically connected by the droplet, and the liquid A leakage current may be generated between the spray electrode 1 and the reference electrode 2 due to the droplets.
  • spray back occurs in the direction of the region Lc from the viewpoint of suppressing the occurrence of leakage current.
  • the substance sprayed from the spray electrode 1 flies farthest from the reference electrode 2 when the tip 5 of the spray electrode 1 is positioned at the point c. For this reason, when the tip part 5 of the spray electrode 1 is located at the position of the point c, it can be said that wetting is most easily controlled on the surface of the apparatus.
  • the tip 5 of the spray electrode 1 is positioned between the point b and the point c and between the point c and the point d, for example, between the region Lb and the region Lc and between the region Lc and the region Ld. It is also possible to limit the area where spray back can occur. In addition, it can be said that the tip portion 5 of the spray electrode 1 may be positioned at the point a if there is no operational problem with the occurrence of spray back in the region La.
  • the electrostatic spraying device 100 can position the tip of the spray electrode 1 that defines the spraying direction of the substance at any position in order to maintain the stability of spraying. Effects that cannot be achieved by the electrospraying device can be realized.
  • FIG. 20 is a diagram for comparing and explaining the spray electrode 1 according to the present embodiment and the spray electrode 15 according to another embodiment.
  • Each of the spray electrode 1 and the spray electrode 15 has an inclined surface 9 that is inclined with respect to the axis of the spray electrode, and the tip becomes narrower and sharper toward the tip. And the spray direction of a spray substance is prescribed
  • the spray electrode 1 is inclined with respect to the axial center of the spray electrode 1 and defines the shape of the tip portion of the spray electrode 1 when the sprayed electrode 1 is sprayed upward.
  • the contact 16 between the lower end of 9 and the outer surface of the spray electrode 1 has an acute angle. Therefore, when a voltage is applied between the spray electrode 1 and the reference electrode 2, the electric field focal point is formed at the contact 16, and thus an electric field may be formed between the reference electrode 2 and the contact 16. is there. Thereby, it is necessary to consider the case where the substance is sprayed from the contact point 16 instead of the front end portion 5 and a suitable substance spray from the electrostatic spraying device 100 is obstructed.
  • the spray electrode 15 is inclined with respect to the axial center of the spray electrode 15 and defines the shape of the distal end portion of the spray electrode 15 when the sprayed electrode 15 is sprayed on the material spray side.
  • the contact 17 between the lower end of 9 and the outer surface of the spray electrode 15 has a curved surface (curved surface portion). Therefore, when a voltage is applied between the spray electrode 15 and the reference electrode 2, the electric field focal point is not formed at the contact point 17, and the electric field is generated between the reference electrode 2 and the tip 5 of the spray electrode 15. Is formed. Thereby, a substance is sprayed from the front-end
  • the electrostatic spraying device 100 uses the spray electrode 1, when the tip 5 is positioned at the point c in FIG. 8, a voltage is applied between the spray electrode 1 and the reference electrode 2 and the contact 16. It is considered that the focus of the electric field is easily formed. Therefore, it can be said that it is effective to use the spray electrode 15 when positioning the tip of the spray electrode at the point c in FIG.
  • FIG. 21 is a diagram for explaining the housing surface of the electrostatic spraying device 100.
  • the lower side of the drawing is the direction of gravity.
  • the electrostatic spraying apparatus 100 is in a standing state.
  • the electrostatic spraying device 100 shown in FIG. An annular opening 11 formed so as to surround the spray electrode 1 and an annular opening 12 formed so as to surround the reference electrode 2 are formed on the surface 30 of the electrostatic spraying apparatus 100 on the liquid spray side. And are formed.
  • a groove 34a, a groove 34b, and a groove 34c are formed on the surface 30.
  • the groove 34b and the groove 34c are formed to extend in the longitudinal direction (the vertical direction in the drawing) of the electrostatic spraying device 100, and are connected to each other via the groove 34a.
  • the groove 34a is formed to extend in the short direction (left and right direction in the drawing) of the electrostatic spraying apparatus 100, and connects the groove 34b and the groove 34c via the groove 34a.
  • the groove 34a, the groove 34b, and the groove 34c intersect in a substantially vertical direction.
  • the groove 34b and the groove 34c are not essential, and only the groove 34a may be formed.
  • a liquid recovery part 35a, a liquid recovery part 35b, and a liquid recovery part 35c are formed in the groove 34a.
  • the liquid recovery part 35a is located at the center of the groove 34a extending in the horizontal direction, and the liquid recovery part 35b and the liquid recovery part 35c are located at both ends of the groove 34a.
  • each of the liquid recovery part 35a, the liquid recovery part 35b, and the liquid recovery part 35c is formed in a trapezoidal shape, for example, and the shorter one of the upper and lower bases is located on the lower side in the gravity direction ( Hereinafter, this shape may be referred to as an inverted trapezoid).
  • the liquid recovery part 35a, the liquid recovery part 35b, and the liquid recovery part 35c may be formed in the groove 34a with an inclination, for example, so as to easily recover the liquid inside the electrostatic spraying device 100. .
  • the groove 34a is formed with a length of 26 mm and a height of 1 mm, for example.
  • the liquid recovery part 35a is formed with an upper base of 6 mm, a lower and lower part of 4 mm, and a height of 1.6 mm.
  • the liquid recovery part 35b and the liquid recovery part 35c are formed with an upper base of 5 mm, a lower and lower part of 3 mm, and a height of 1.6 mm.
  • these numerical values are examples, and are not limited to these numerical values.
  • the spray electrode 1 is connected to the electric conductor 38, and a voltage is applied from the power supply device 3 (not shown) through the electric conductor 38.
  • the reference electrode 2 is connected to the electrical conductor 39, and a voltage is applied from the power supply device 3 (not shown) via the electrical conductor 39.
  • the electric conductor 38 and / or the electric conductor 39 may be coated with a material having water / oil repellency.
  • the spray electrode 1 and / or the reference electrode 2 may be attached with an O-ring made of chemically resistant silicon, fluorine rubber, resin, or the like.
  • the electrostatic spraying apparatus 100 has the above-described configuration, thereby providing the following effects.
  • a liquid recovery part 35a, a liquid recovery part 35b, and a liquid recovery part 35c are formed in the groove 34a. For this reason, when the liquid flows into the groove 34a, the liquid can smoothly enter the liquid recovery part 35a, the liquid recovery part 35b, and the liquid recovery part 35c. Even when the electrostatic spraying device 100 is tilted left and right, since the liquid recovery part 35b and the liquid recovery part 35c are formed at both ends of the groove 34a, the liquid is recovered from the liquid recovery part 35b and the liquid recovery part. The part 35c can be entered.
  • the liquid that has entered the groove 34a has high viscosity and / or low volatility, the liquid can smoothly enter the liquid recovery unit 35a, the liquid recovery unit 35b, and the liquid recovery unit 35c. It can be recovered in the electrostatic spraying device 100.
  • the liquid recovery portion 35 is formed in the groove 34 located in the vicinity of the position. By doing so, the sprayed liquid can be quickly recovered.
  • the position of the tip portion 5 of the spray electrode 1 with respect to the reference electrode 2 can be changed as appropriate according to the position of the liquid recovery unit 35, thereby increasing the degree of freedom in device design. Is possible.
  • the tip of the first electrode may be positioned farthest from the second electrode when viewed from the axial center of the first electrode.
  • the electrostatic spraying apparatus which concerns on 1 aspect of this invention sprays a substance in the direction furthest away from the said 1st electrode, and sprays back to the area
  • the electrostatic spraying apparatus which concerns on 1 aspect of this invention can improve the stability of spraying.
  • the first electrode is inclined with respect to the axis of the first electrode when the side on which the substance is sprayed is the upper side in the first electrode.
  • the lower end portion of the inclined surface may include a curved surface portion.
  • the electrostatic spraying device Since the focal point of the electric field is likely to be formed at the corner, the electrostatic spraying device according to one embodiment of the present invention has the above-described configuration, so that a voltage is applied between the first electrode and the second electrode. Sometimes, the focal point of the electric field is not formed on the curved surface portion, and an electric field is formed between the tip portion of the first electrode and the second electrode. Therefore, in the electrostatic spraying device according to one embodiment of the present invention, the stability of spraying can be improved by spraying a substance from the tip of the first electrode.
  • the present invention can be used in an electrostatic spraying apparatus that sprays aromatic oil, chemicals for agricultural products, pharmaceuticals, agricultural chemicals, insecticides, air cleaning chemicals, and the like.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention concerne un atomiseur électrostatique (100) qui est doté d'une électrode de pulvérisation (1), d'une électrode de référence (2), d'un circuit de commande (24) et d'un dispositif à tension élevée (22). Une tension est appliquée entre l'électrode de pulvérisation (1) et l'électrode de référence (2). Le circuit de commande (24) régule la quantité de courant circulant à travers l'électrode de référence (2) de façon à conserver ladite quantité de courant dans une plage prescrite. Le dispositif à tension élevée (22) applique une tension entre l'électrode de pulvérisation (1) et l'électrode de référence (2) sur la base de la quantité de courant régulée.
PCT/JP2014/050372 2013-01-15 2014-01-10 Atomiseur électrostatique et procédé de commande de l'atomiseur électrostatique WO2014112447A1 (fr)

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JP2013004946 2013-01-15

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Publication number Priority date Publication date Assignee Title
WO2018043735A1 (fr) * 2016-09-05 2018-03-08 住友化学株式会社 Dispositif de pulvérisation électrostatique
WO2020080347A1 (fr) * 2018-10-17 2020-04-23 住友化学株式会社 Appareil de pulvérisation électrostatique
EP3731971A4 (fr) * 2017-12-29 2021-09-29 Sanotech 360, Llc Pulvérisateur électrostatique

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JPH04215864A (ja) * 1990-05-18 1992-08-06 Ransburg Automot Kk 静電塗装装置
US5927618A (en) * 1993-09-02 1999-07-27 The Procter & Gamble Company Electrostatic spraying device
US6302331B1 (en) * 1999-04-23 2001-10-16 Battelle Pulmonary Therapeutics, Inc. Directionally controlled EHD aerosol sprayer
WO2004089552A2 (fr) * 2003-04-07 2004-10-21 Aerstream Technology Limited Electrode de pulverisation
JP2013027832A (ja) * 2011-07-29 2013-02-07 Sumitomo Chemical Co Ltd 静電噴霧装置、および当該静電噴霧装置を用いて静電噴霧を行う方法
WO2014030681A1 (fr) * 2012-08-24 2014-02-27 住友化学株式会社 Dispositif de pulvérisation électrostatique

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Publication number Priority date Publication date Assignee Title
JPH04215864A (ja) * 1990-05-18 1992-08-06 Ransburg Automot Kk 静電塗装装置
US5927618A (en) * 1993-09-02 1999-07-27 The Procter & Gamble Company Electrostatic spraying device
US6302331B1 (en) * 1999-04-23 2001-10-16 Battelle Pulmonary Therapeutics, Inc. Directionally controlled EHD aerosol sprayer
WO2004089552A2 (fr) * 2003-04-07 2004-10-21 Aerstream Technology Limited Electrode de pulverisation
JP2013027832A (ja) * 2011-07-29 2013-02-07 Sumitomo Chemical Co Ltd 静電噴霧装置、および当該静電噴霧装置を用いて静電噴霧を行う方法
WO2014030681A1 (fr) * 2012-08-24 2014-02-27 住友化学株式会社 Dispositif de pulvérisation électrostatique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018043735A1 (fr) * 2016-09-05 2018-03-08 住友化学株式会社 Dispositif de pulvérisation électrostatique
CN109641223A (zh) * 2016-09-05 2019-04-16 住友化学株式会社 静电喷雾装置
JPWO2018043735A1 (ja) * 2016-09-05 2019-06-24 住友化学株式会社 静電噴霧装置
US10994292B2 (en) 2016-09-05 2021-05-04 Sumitomo Chemical Company, Limited Electrostatic spraying device
JP6994463B2 (ja) 2016-09-05 2022-01-14 住友化学株式会社 静電噴霧装置
EP3731971A4 (fr) * 2017-12-29 2021-09-29 Sanotech 360, Llc Pulvérisateur électrostatique
WO2020080347A1 (fr) * 2018-10-17 2020-04-23 住友化学株式会社 Appareil de pulvérisation électrostatique

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