JP2010194539A - Electrostatic atomizing device and electrostatic atomizing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic atomizing device and an electrostatic atomizing method which can prevent ozone concentration from getting high near a jetting port even when the air flow for mist discharge is changed. <P>SOLUTION: The electrostatic atomizing device includes: a discharge electrode; a high voltage power source part which applies high voltage to the discharge electrode; a means to supply water to the discharge electrode; a fan 7 to discharge charged fine water droplets comprising atomized water held by the discharge electrode to outside space. The discharge state of the discharge electrode is adjusted to be at the prescribed ozone concentration or lower according to the air flow of the fan 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrostatic atomizer and an electrostatic atomization method that generate mist by Rayleigh splitting.

  By applying a high voltage to the discharge electrode to which water is supplied and discharging it, the water held by the discharge electrode is caused to undergo Rayleigh splitting and atomized, whereby nanometer-sized charged fine particle water (hereinafter referred to as this) There are electrostatic atomizers that produce "nano-sized mist". The nano-size mist contains radicals and has a long life, and can diffuse a large amount into the space, effectively acting on malodorous components attached to indoor walls, clothes, curtains, etc. It has a feature that it can be made non-brominated (see Patent Document 1).

Japanese Patent No. 3260150

  In order to spread the nano-sized mist generated by the electrostatic atomizer to every corner of the external space, a large amount of nano-sized mist is generated and the air blown to release the large amount of mist toward the outside. It is preferable to provide the means, but when it is provided in this way, there is a problem that when the air volume of the blower means becomes small, the ozone concentration due to the discharge becomes high near the jet outlet.

  The present invention has been invented in view of the above-mentioned conventional problems, and is an electrostatic that can prevent an increase in ozone concentration in the vicinity of the jet outlet even when the air volume of the blowing means is changed. An object of the present invention is to provide an atomizing device and an electrostatic atomizing method.

  In order to solve the above-mentioned problems, the present invention provides a discharge electrode, a high-voltage power supply unit that applies a high voltage to the discharge electrode, means for supplying water to the discharge electrode, and water held by the discharge electrode. A blowing unit that discharges atomized charged fine particle water to an external space, and a control unit that adjusts the discharge state of the discharge electrode to be equal to or lower than a predetermined ozone concentration in accordance with the air volume of the blowing unit. It is set as the electrostatic atomizer characterized by this.

  In the electrostatic atomizer having the above configuration, since the discharge state is adjusted according to the air volume, it is possible to prevent the ozone concentration from increasing in the vicinity of the ejection port.

  The control means preferably controls the discharge state based on the discharge current value and changes the target discharge current value according to the air volume of the blower means.

  Moreover, the said control means may make a high voltage | pressure power supply part operate intermittently in the ratio according to the air volume of the ventilation means.

  The means for supplying water is preferably a cooling means for generating condensed water. At this time, if the control means controls the cooling degree of the discharge electrode by the cooling means in accordance with the discharge current value during the operation period of the high-voltage power supply unit that performs intermittent operation, the cooling degree of the discharge electrode is stable. Will be controlled.

  Furthermore, when the cooling means controls the degree of cooling of the discharge electrode, the control means adds a correction according to the pause ratio of the high-voltage power supply section that performs intermittent operation, so that the high-voltage power supply section can be stopped during the pause period. The amount of water produced can be adjusted in response to the decrease in water reduction.

  In addition, when the high-voltage power supply unit is intermittently operated as described above, the control unit continuously operates the high-voltage power supply unit at the beginning of operation and starts the intermittent operation immediately after reaching the target discharge current value. Alternatively, the intermittent operation of the high-voltage power supply unit may be started immediately after the generation of condensed water at the beginning of operation.

  Furthermore, in the electrostatic atomizer having the above configuration, the control means sets an upper limit value of the discharge current according to the air volume of the air blowing means, and the discharge current exceeds the upper limit value while the high-voltage power supply unit is in operation. In such a case, the high-voltage power supply unit should be stopped, or the upper limit of the cooling degree of the discharge electrode by the cooling means is set according to the air volume of the blowing means, so that the cooling degree of the discharge electrode does not exceed this upper limit. It is preferable to control the cooling means.

  Moreover, in the electrostatic atomizer of the said structure, it is also preferable to provide a grounded electrode.

  In order to solve the above problems, the present invention provides an electrostatic atomization method in which a high voltage is applied to water held by a discharge electrode, and charged fine particle water generated by electrostatic atomization is discharged to an external space by a blowing means. And according to the air volume of the said ventilation means, it is good also as what changes a discharge current or intermittently applies the said high voltage so that it may become predetermined | prescribed ozone concentration.

  Each configuration described above can be appropriately combined without departing from the gist of the present invention.

  The present invention can discharge mist vigorously by the blowing means, and can prevent the ozone concentration from increasing near the jet outlet even when the air volume of the blowing means is changed. There is an effect.

It is a general view of an example electrostatic atomizer in an embodiment of the present invention. It is a circuit diagram same as the above. It is a block circuit diagram same as the above. (A) (b) (c) is explanatory drawing which shows the state of the tailor cone formed with the dew condensation water on a discharge electrode at the time of discharge. It is a time chart about discharge electrode temperature control same as the above. It is a flowchart regarding temperature feedback same as the above. It is explanatory drawing regarding a discharge current feedback same as the above. It is a time chart which shows the reading method of discharge current value data same as the above. It is another time chart which shows the reading direction of discharge current value data same as the above. It is a time chart which shows the timing of an intermittent operation start same as the above. It is another time chart which shows the timing of an intermittent operation start same as the above.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. FIG. 1 shows an entire unit of an electrostatic atomizer of an example in the embodiment of the present invention, and FIG. 2 shows a circuit configuration of the electrostatic atomizer of this example. As shown in FIG. 1 and FIG. 2, this electrostatic atomizer is opposed to the discharge electrode 2 at one end of the discharge electrode 2 with a required distance, and its inner peripheral edge functions as a substantial electrode. The counter electrode 3, the high voltage power source 4 that applies a high voltage for discharge between the electrodes 2 and 3, and the other end of the discharge electrode 2 is connected to the heat absorption side so that the temperature of the discharge electrode 2 is lower than the dew point. This is a control means for controlling the Peltier module 5 as a cooling means for cooling to the power source, a power source 6 incorporating a power source 60 for the Peltier module 5, the high-voltage power source unit 4, the Peltier module 5, and a fan 7 described later. The counter electrode 3 is grounded, and a negative or positive high voltage (for example, −4.6 kV) is applied to the discharge electrode 2 side during discharge.

  Reference numeral 50 in the figure denotes heat radiating fins arranged on the heat radiating side of the Peltier module 5, and the air sent from the fan 7, which is the air blowing means arranged in the unit of the electrostatic atomizer, becomes the cooling air B. The cooling efficiency of the Peltier module 5 is improved by hitting the radiator fin 50. Further, the air blown from the fan 7 is diverted to become an induced wind A, and this induced wind A attracts a nano ion mist formed by electrostatic atomization of water held by the discharge electrode 2 toward the external space. It is a structure to be released. In addition, you may provide separately the ventilation means which sends out the cooling wind B, and the ventilation means which sends out the induced wind A. Reference numeral 51 in the figure is a thermistor for measuring the temperature of the Peltier module 5, and reference numeral 8 is an environmental temperature / humidity sensor.

  The high-voltage power supply unit 4 includes a high-voltage generation circuit 40, a discharge voltage detection circuit 41, and a discharge current detection circuit 42 as shown in FIG. The discharge voltage detected by the discharge voltage detection circuit 41 and the discharge current detected by the discharge current detection circuit 42 are input to the control circuit C, and the Peltier module is based on the discharge voltage and the discharge current by the control circuit C. 5, the degree of cooling of the discharge electrode 2 by the Peltier module 5, that is, the amount of condensed water produced at the discharge electrode 2 is controlled.

  When the discharge voltage is applied between the discharge electrode 2 and the counter electrode 3 in a state where moisture in the air is condensed on the discharge electrode 2 by cooling the discharge electrode 2, the water on the discharge electrode 2 is as shown in FIG. As shown in FIG. 3, the shape is called a tailor cone by being pulled toward the counter electrode 3 side. Rayleigh splitting occurs at the tip of the tailor cone and nano-size mist is generated, whereby electrostatic atomization is performed.

  At this time, if the amount of water on the discharge electrode 2 decreases and the tailor cone becomes smaller as shown in FIG. 4A, the discharge current decreases, and the amount of water on the discharge electrode 2 increases, as shown in FIG. If the tailor cone is larger, the discharge current increases. Incidentally, when a discharge voltage of −4.4 kV is applied, the discharge current is 3.0 μA in the state shown in FIG. 4A, the discharge current is 6.0 μA in the state shown in FIG. 4B, and FIG. In the state shown in FIG. 2, the discharge current was 9.0 μA.

  In other words, the amount of condensed water and the shape (height) of the tailor cone are related, and the discharge current also changes from the height of the tailor cone. Therefore, the height of the tailor cone is measured by measuring the discharge current. That is, the amount of condensed water can be known. Here, if the amount of condensed water on the discharge electrode 2 is further reduced, a discharge occurs between the discharge electrode 2 and the counter electrode 3 instead of a discharge between the water on the discharge electrode 2 and the counter electrode 3. This will cause ozone generation. Conversely, if the amount of water on the discharge electrode 2 is further increased, the distance between the counter electrode 3 and the water becomes short, a short-circuit current flows, and a mist having a target particle diameter cannot be obtained.

  Therefore, if the amount of water on the discharge electrode 2 is estimated from the discharge current value at a certain discharge voltage and the degree of cooling of the Peltier module 5 is adjusted based on this estimation, the amount of condensed water generated can be adjusted. Is possible. That is, when the discharge current is small, the applied voltage of the Peltier module 5 is increased to further cool the discharge electrode 2 to increase the condensed water, and when the discharge current is large, the degree of cooling is reduced to reduce the condensed water. By performing feedback control, the amount of condensed water on the discharge electrode 2 can always be set to an amount suitable for generation of nano-size mist.

  However, if the discharge voltage changes, the discharge current value that represents an appropriate amount of condensed water also changes. Therefore, the optimum discharge current range according to the discharge voltage is specified, and the detected discharge current value i (n ) Maintains the vicinity of the target value i (n) typ in the above range, so that the control circuit C performs duty control of the voltage applied to the Peltier module 5.

  In addition, since the condensed water is not generated on the discharge electrode 2 when the discharge electrode 2 at the initial stage of operation is not sufficiently cooled, the above control is performed after the condensed water is secured on the discharge electrode 2. Until then, only the Peltier module 5 is operated without discharging. In other words, the control circuit C sets the target temperature T (dew point) according to the environmental temperature and humidity measured by the environmental temperature / humidity sensor 8 and starts to detect it indirectly from the thermistor 51 with the start of operation of the electrostatic atomizer. The Peltier module 5 is operated at a high level until the temperature of the discharge electrode 2 is within the required temperature range (T + 1 to T-1) including the target temperature T (section a in FIG. 5). When the temperature falls to the upper limit value T + 1 of the required temperature range, the control circuit C performs the applied voltage control by the duty control of the Peltier module 5 in advance according to the control by the temperature feedback of the discharge electrode 2, that is, according to the ambient temperature and humidity. If the determined duty value is set, and the temperature of the discharge electrode 2 falls below the lower limit value T-1 of the required temperature range, the duty is lowered by one step, and if the temperature exceeds the upper limit value T1, the duty is increased by one step. Performing a gel control. The high-voltage power supply unit 4 is operated after a predetermined time t when the condensed water is formed on the discharge electrode 2 from the time when the upper limit value T + 1 is reached, and a predetermined high voltage set in advance is applied to the discharge electrode 2 and the counter electrode. The voltage applied to the Peltier module 5 is switched from the control based on the temperature feedback of the discharge electrode 2 to the feedback control based on the discharge current.

  The predetermined time t until the generation of condensed water is preferably changed according to the electrode cooling temperature (corresponding to a value obtained by subtracting the target temperature T from the temperature before the start of cooling) ΔT. If the electrode cooling temperature ΔT is 5 ° C. or less, it is extremely easy to condense, and if the electrode cooling temperature ΔT is 10 ° C. or more, it is difficult to condense. For example, the electrode cooling temperature ΔT is 5 ° C. or less. If the required time t is 30 seconds and the electrode cooling temperature ΔT is 5 to 10 ° C., the required time t is 60 seconds, and if the electrode cooling temperature ΔT is 10 ° C. or more, the required time t is 90 °. Seconds. By performing such control, dew condensation water can be secured on the discharge electrode 2 at the start of discharge, and a situation in which too much dew condensation water is generated on the discharge electrode 2 can be avoided. FIG. 6 shows a flowchart relating to this point.

  The environmental humidity can be measured without using an external sensor such as the environmental temperature / humidity sensor 8. Before starting the cooling of the discharge electrode 2 at the beginning of operation, a high voltage is applied between the discharge electrode 2 and the counter electrode 3, and the discharge current and the discharge voltage at this time are measured, whereby the interelectrode resistance (= discharge voltage / Discharge current) is measured. At this point in time, water is not generated in the discharge electrode 2 and the distance between the electrodes 2 and 3 is further away than when water is present, so that no atomization occurs and the discharge current is also weak. Only flows. However, the inter-electrode resistance at this time has a correlation with the amount of moisture in the air, so the humidity can be estimated from here.

  Next, feedback control based on the discharge current will be described in detail. At the time ta when the time Δt from when the discharge starts until each circuit becomes stable, the control circuit C starts taking in the discharge voltage value and the discharge current value from the discharge voltage detection circuit 41 and the discharge current detection circuit 42, and is constant. The target value i (n) typ of the discharge current of the discharge current control is obtained from the discharge voltage value obtained by calculating the average value for each time, and the measured discharge current value i (n) is the target value i (n ) The applied voltage applied to the Peltier module 5 is feedback-controlled by duty control so as to be typ.

Here, in order to avoid an overshoot, as shown in FIG. 7, the average values v (1) and i (1) of the discharge voltage value and the discharge current value started to be taken in at time ta are at time tb after Δt time. When the average values v (2) and i (2) of the discharge voltage value and the discharge current value that have started to be taken in at time tb are determined at time tc after Δt time, within the time Δt between time tb and tc. Difference Δi (2) = i (2) −i (1) between the discharge voltage v (1) and the discharge voltage v (1) at time tb and the target value ityp (1) of the discharge current at time tc, When the difference Δid (2) from the average value i (2) of the discharge current at time tc is obtained and the duty of the applied voltage of the Peltier module 5 between time tb-tc is D (2), this duty D Increment ΔD (2) from (2) ΔD (2) = a × Δid (2) −b × Δi (2)
(A and b are parameters)
And D (3) = D (2) + ΔD (2) is used as the duty of the voltage applied to the Peltier module 5 during the next time tc-td. This is repeated sequentially every time Δt, that is, ΔD (n) = a × Δid (n) −b × Δi (n) (1)
Is obtained for each Δt, and is added to the previous duty D (n−1) to determine the next duty D (n). Note that the duty value D (n) and the increment ΔD (n) mentioned here correspond to D1 to D256 obtained by dividing the duty 0 to 100% by dividing into 256.

  Here, in this example, the fan 7 is provided as a blowing means for generating the induced wind A as described above, and the rotational speed of the fan 7, that is, the air volume of the induced wind A can be set in multiple stages. Therefore, in order to avoid a situation where the ozone concentration due to discharge becomes high near the jet outlet when the air volume is set small, the high voltage power supply unit 4 sets the target value i (n) typ of the discharge current to the fan 7 while continuously operating. A control circuit C is provided so as to be changed according to the air volume. Normally, if the airflow is constant, the ozone concentration increases as the discharge current increases. Therefore, the target value i (n) typ of the discharge current is changed to a larger value as the airflow is set larger. If the target value i (n) typ is changed to a smaller value when it is changed to a smaller value, the ozone concentration near the jet outlet is kept below the standard regardless of the air volume, and the effect of nano-size mist is achieved. It becomes possible to demonstrate to the maximum.

  Table 1 shows that the air volume from the fan 7 can be set in four stages of “light wind”, “weak”, “medium”, and “strong”. If “medium” is set, for example, I = 6 μA is set as a target. In contrast to the value i (n) typ, if this is changed to a weak “weak” by one step, I−3 = 3 μA is set to the target value i (n) typ and set to a strong “strong” by one step. The case where I + 3 = 9 μA is the target value i (n) typ is shown. In other words, if the user sets the air volume of the fan 7 to “strong” when the external space is wide, the target value i (n) typ is automatically set high to maintain the discharge state at a high level, and the external space A lot of nano-sized mist can be distributed to every corner to maximize the effect. At this time, since the air volume is large, the ozone concentration in the vicinity of the jet outlet is also kept below a specified level. When the user sets the air volume to “Weak” or “Breeze” when the external space is narrow or at bedtime, the target value i (n) typ is automatically set to a low level and the discharge state is set to a low level. The ozone concentration in the vicinity of the jet outlet is kept below the specified level.

On the other hand, in order to change the discharge state between the discharge electrode 2 and the counter electrode 3 in accordance with the air volume of the fan 7, the target value i (n) typ of the discharge current is set regardless of the air volume, and the high voltage power supply unit It is also preferable to provide the control circuit C so that 4 is intermittently operated at a rate corresponding to the air volume of the fan 7. That is, when the ratio of the operation period during intermittent operation of the high-voltage power supply unit 4 (hereinafter referred to as “high-pressure duty”) is changed to a larger value as the air volume is set larger, and conversely, the air volume is changed smaller. Even if the control circuit C is provided so as to change the high-pressure duty to a small value, the effect of the nano-size mist can be maximized while the ozone concentration near the jet outlet is kept below the standard regardless of the air volume. . Table 2 shows that if the air volume from the fan 7 is set to “medium”, the high-voltage power supply unit 4 is intermittently operated at a high-pressure duty of 50%, for example, and if this is changed to “weak” by one step, the high-pressure duty 20 In this case, intermittent operation is performed at%, and the high-pressure duty is 100%, that is, continuous operation is performed by changing to “strong” one step stronger.

When the high-voltage power supply unit 4 is intermittently operated, the duty of the Peltier module 5, that is, the degree of cooling of the discharge electrode 2 is determined based on the discharge current value read during the operation period. FIG. 8 shows a case where one cycle of the intermittent operation of the high-voltage power supply unit 4 is 3 s and the high-voltage duty is 10% (that is, the operation period 300 ms and the stop period 2700 ms in one cycle). The discharge current reading minimum period ΔP = 20 ms, and the average value of the eight data read values is the discharge current value at that time. After the operation period of the high-voltage power supply unit 4 starts, the system waits for ΔP × 8 = 160 sm, reads data eight times during 140 ms after the standby time elapses, and sets the average value as a final value. The standby time is set in order to ensure a time for the discharge current and the discharge voltage to rise. FIG. 9 shows a case where one cycle of the intermittent operation of the high-voltage power supply unit 4 is 3 s and the high-voltage duty is 20% (that is, the operation period 600 ms and the stop period 2400 ms in one cycle). In this case, after the standby time during the operation period, the average value (determined value) for every eight data readings can be taken twice. If the operation period ends before the data reading reaches eight times, the data becomes invalid. During the operation period, the final value for every eight data readings is sequentially updated, and the final value immediately before the stop period among the final values for every eight data readings is set as the final value for that operation period. . Then, the Peltier module 5 is controlled with the duty calculated using the determined value of the discharge current during each operation period in the equation (1).

  When the calculation using the above formula (1) is performed to control the degree of cooling of the discharge electrode 2 by the Peltier module 5, that is, the Peltier module 5, the high-voltage duty of the high-voltage power supply unit 4 that operates intermittently is set. It is preferable to add a correction as shown in Table 3 accordingly. In consideration of the fact that there is no decrease in the amount of water due to electrostatic atomization during the pause period of the high-voltage power supply unit 4, the larger value is reduced as the high-pressure duty is reduced (that is, the pause ratio is increased). The duty value calculated from the equation (1) is sequentially corrected for each calculation, and the degree of cooling of the Peltier module 5, that is, the discharge electrode 2 is controlled by the duty obtained by applying this correction. The discharge electrode 2 can be quickly and reliably converged to the degree of cooling of the discharge electrode 2 that can stably supply water without generating excessive dew condensation water.

The intermittent operation of the high-voltage electrode unit 4 may be started after the discharge current reaches the target value i (n) typ as shown in FIG. 10, or may be started from the initial operation start as shown in FIG. Good. In the control shown in FIG. 10, immediately after determining the generation of condensed water at the beginning of the operation, the high-voltage power supply unit 4 is first continuously operated to quickly converge the discharge current to the target value i (n) typ. Is switched to the intermittent operation when the discharge current value reaches the target value i (n) typ ± 0.2 μA. On the other hand, the control shown in FIG. 11 starts the intermittent operation of the high-voltage power supply unit 4 immediately after determining the generation of condensed water at the beginning of the operation. Are better. Further, in the control shown in FIG. 10, if it takes time to reach the target value i (n) typ, the ozone concentration may increase in the vicinity of the jet outlet during the continuous operation of the high-voltage power supply unit 4 at the beginning of operation. However, this ozone concentration increase can also be suppressed by intermittent operation from the beginning as shown in FIG.

  In addition, the determination of condensed water generation is determined that condensed water has been formed on the discharge electrode 2 when a predetermined time t has elapsed since the temperature of the discharge electrode 2 reached the required temperature range as described above. However, when the initial control of the operation is performed without using the temperature detection of the discharge electrode 2 by the thermistor 51 or the humidity detection by the environmental temperature / humidity sensor 8, another determination method can be used.

  The control and determination method in this case is as follows. That is, as the operation starts, the control circuit C takes in the environmental temperature, sets the electrode cooling temperature ΔT according to the environmental temperature, and sets the Peltier applied voltage (corresponding to the duty value) according to the electrode cooling temperature ΔT. To do. Since the electrode cooling temperature ΔT and the applied voltage in the Peltier module 5 have linear characteristics, the applied voltage increases as the electrode cooling temperature ΔT increases. The control circuit C simultaneously activates the high-voltage power supply unit 4 to start discharging, and detects the discharge current by the discharge current detection circuit 42. If there is water on the discharge electrode 2, a discharge current flows. However, when the condensed water has not been generated, the discharge current hardly flows if it is normal. If the detected current value is less than the constant Iini, the control circuit C continues to monitor the current value periodically while maintaining the applied state of the discharge voltage as a normal operation. When the value becomes equal to or greater than the constant Iini (μA), it is determined that condensed water has gathered on the discharge electrode 2 and electrostatic atomization has started, and at this point, the control shifts to feedback control based on the discharge current.

  Further, at the initial stage of operation, only the Peltier module 5 is operated and only the discharge electrode 2 is cooled for a while, and then the high voltage power supply unit 4 is operated to start discharging. The discharge is started after waiting for a time when condensed water will be generated, and this time is preferably 1 minute or more. Then, if the discharge current value at the start of discharge is smaller than the value determined as the upper limit value of the discharge current when the discharge is started with the amount of dew condensation water generated in the initial few minutes, the condensation is normally formed on the discharge electrode 2. It determines with water having been produced | generated and transfers to the above-mentioned feedback control.

  Table 4 shows the upper limit value of the discharge current and the upper limit value of the duty of the applied voltage of the Peltier module 5. The upper limit value of the discharge current is set so as to become smaller as the airflow from the fan 7 becomes smaller. In this example, the upper limit value is always more constant than the target value i (n) typ of the discharge current. It is set to increase by the value (5 μA). When the discharge current detected during operation of the high-voltage power supply unit 4 exceeds this upper limit value, the discharge current increases rapidly during operation by controlling the high-voltage power supply unit 4 to stop. If this increase cannot be suppressed by normal control, the discharge can be stopped urgently to prevent the ozone concentration from rising.

Further, the upper limit value of the duty of the applied voltage of the Peltier module 5 is set so as to become smaller as the air volume from the fan 7 becomes smaller. The upper limit value of the duty corresponds to the upper limit of the degree of cooling of the discharge electrode 2 by the Peltier module 5. By controlling the duty not to exceed the upper limit value, dew condensation water is formed on the discharge electrode 2. It is possible to prevent excessive generation and excessive increase of the discharge current.

2 Discharge electrode 3 Counter electrode 4 High voltage power supply 5 Peltier module 7 Fan C Control circuit

Claims (12)

  A discharge electrode; a high-voltage power supply for applying a high voltage to the discharge electrode; means for supplying water to the discharge electrode; and charged fine particle water formed by electrostatic atomization of water held by the discharge electrode An electrostatic atomizer comprising: air blowing means to be discharged at a time; and control means for adjusting a discharge state of the discharge electrode to be equal to or lower than a predetermined ozone concentration according to an air volume of the air blowing means.   2. The control unit according to claim 1, wherein the control unit controls the discharge state based on a discharge current value and changes a target discharge current value according to an air volume of the blower unit. Electrostatic atomizer.   The electrostatic atomizer according to claim 1, wherein the control unit intermittently operates the high-voltage power supply unit at a rate corresponding to the air volume of the blower unit.   The electrostatic atomizer according to claim 1, wherein the means for supplying water is a cooling means for generating condensed water.   The said control means controls the cooling degree of the discharge electrode by the said cooling means according to the discharge current value in the driving | running period of the said high voltage power supply part which performs intermittent operation. Electrostatic atomizer.   6. The control unit according to claim 4 or 5, wherein when the cooling degree of the discharge electrode is controlled by the cooling unit, the control unit adds a correction according to a pause rate of the high-voltage power supply unit that performs intermittent operation. The electrostatic atomizer described in 1.   The control means continuously operates the high-voltage power supply unit at an initial stage of operation of the electrostatic atomizer and starts intermittent operation immediately after reaching a target discharge current value. The electrostatic atomizer as described in any one of claim | item 3 -6.   The said control means starts intermittent operation | movement of the said high voltage | pressure power supply part immediately after the dew condensation water generation | occurrence | production of the operation start initial stage of an electrostatic atomizer, It is any one of Claims 3-6 characterized by the above-mentioned. The electrostatic atomizer described.   The control means sets an upper limit value of the discharge current according to the air volume of the air blowing means, and stops the high voltage power supply section when the discharge current exceeds the upper limit value during operation of the high voltage power supply section. It is, The electrostatic atomizer as described in any one of Claims 1-8 characterized by the above-mentioned.   The control means sets the upper limit of the cooling degree of the discharge electrode by the cooling means according to the air volume of the blower means, and controls the cooling means so that the cooling degree of the discharge electrode does not exceed the upper limit. It is, The electrostatic atomizer as described in any one of Claims 4-6 characterized by the above-mentioned.   The electrostatic atomizer according to claim 1, further comprising a grounded electrode. An electrostatic atomization method in which a high voltage is applied to water held by a discharge electrode, and charged fine particle water generated by electrostatic atomization is discharged to an external space by an air blowing means, depending on the air volume of the air blowing means, An electrostatic atomization method characterized by changing a discharge current or intermittently applying the high voltage so as to obtain a predetermined ozone concentration.