JP2010044876A - Ion generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion generating device can stably generate positive and negative ions and restrict generation of ozone. <P>SOLUTION: The ion generating device is structured of a discharge electrode 2, a high-frequency and high-voltage generating device 3 and a high-voltage cable 4. The discharge electrode 2 is structured of one or more conductive needle-like electrode 6 and a conductive ground electrode 7 provided opposite to the needle-like electrode. High-frequency and high-voltage output of the high-frequency and high-voltage generating device 3 is applied to the needle-like electrode 6 of the discharge electrode 2, and corona discharge is generated in the discharge electrode 6 to generate positive and negative air ions. The high-frequency and high-voltage generating device 3 includes a power source circuit 8, a high-frequency oscillating circuit 9, a boost transformer 10 and a timer circuit 11. The power source circuit 8 drives the high-frequency oscillating circuit 9 so that the high-frequency and high-voltage is generated in the boost transformer 10 by an output of the high-frequency oscillating circuit 9, and when applying this high-frequency and high-voltage to the needle-like electrode 6 of the discharge electrode 2 through the high-voltage cable, the timer circuit 11 periodically turns on/off output of the high-frequency oscillating circuit 9. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an ion generating device that generates positive and negative air ions suitable for neutralizing static electricity of a charged object and generating static electricity by generating corona discharge in the air.

  Conventionally, a high voltage is applied between a conductive needle electrode constituting a discharge electrode and a conductive ground electrode facing the conductive needle electrode, and air is discharged by corona discharge generated at the needle electrode. 2. Description of the Related Art An ion generator that ionizes to generate air ions is known. Since this type of ion generation device can neutralize the charge of a charged object with the generated air ions, it is generally used as a static eliminator that removes static electricity from the charged object.

  A high voltage generator is connected to the acicular electrode of the discharge electrode, and a DC or AC voltage is applied. When a DC voltage is applied to the needle electrode, positive and negative ions are generated according to the positive and negative voltages, respectively. Therefore, a positive needle electrode that applies a positive voltage and a negative voltage that applies a negative voltage are generated. It is necessary to install one or two or more acicular electrodes. Here, the charged object charged by the positive charge is neutralized and neutralized by the negative ions generated from the negative needle electrode, and the charged object charged by the negative charge is the positive needle. Neutralized and neutralized by positive ions generated from the electrode. At this time, if the balance of positive and negative ions is not balanced, if the amount of ions is insufficient, neutralization is insufficient and charge remains on the charged object, and if the amount of ions is excessive, reverse charging is performed. Therefore, there is a disadvantage that accurate control of the amount of ions generated is necessary.

  On the other hand, when an AC voltage is applied to the needle-like electrode, positive and negative ions are alternately generated according to the positive and negative of the voltage. Therefore, it is possible to neutralize whether the charge of the charged object is positive or negative, and further, for example, even if excessively generated positive ions remain, the negative ions generated thereafter Therefore, neutralization can be performed without precise control of the amount of ions generated as compared with the case of the direct current. Thus, in the case of applying an alternating voltage, the ion balance is better than in the case of applying a direct voltage, but there is a disadvantage that the power supply device is large and heavy.

There is a high-frequency transformer as an AC power source having the same size and weight as a DC power source. The high frequency mentioned here is a frequency of about 10 kHz to 100 kHz, not a general high frequency of MHz or GHz. The high-frequency transformer includes a winding transformer (for example, see Patent Document 1) and a piezoelectric transformer (for example, see Patent Document 2). Both are small and light, but a piezoelectric transformer using a piezoelectric ceramic element can be particularly small and light. A high-frequency corona discharge of several tens of kHz starts discharge at a voltage lower than that of a commercial frequency, and the amount of generated ions is large, but there is a disadvantage that the amount of ozone generated with the ions is larger than that of the commercial frequency.
JP-A-62-86699 (high frequency static eliminator) JP 2001-85189 A (Ion generator)

  An object of the present invention is to provide an ion generating apparatus that can eliminate such inconvenience, stably ensure the generation of positive and negative ions, and suppress the generation of ozone.

  In order to achieve the above object, the present invention reduces the amount of ozone generated by continuously turning on and off the discharge state in a continuous high-frequency corona discharge to provide a discharge pause time. .

  In high-frequency corona discharge, the generation of ions and the generation of ozone were thought to be proportional to the discharge current. When the present inventors periodically turn on and off the high-frequency corona discharge to provide a discharge pause time, ozone is surely reduced in proportion to the discharge time, but the amount of effective ions is reduced so much. The idea of the present invention was obtained based on experimental findings that the amount of ions increases depending on conditions.

  The present invention comprises a discharge electrode, a high-frequency high-voltage generator, and a high-voltage cable, and the discharge electrode is provided with one or more conductive needle electrodes and a conductive ground provided so as to face the needle electrodes. The high-frequency high-voltage output of the high-frequency high-voltage generator is applied to the acicular electrode of the discharge electrode, and corona discharge is generated by the acicular electrode to generate positive and negative air ions. In the ion generation device, the high-frequency high-voltage generation device includes a power supply circuit device, a high-frequency oscillation circuit device, a step-up transformer, and a timer circuit device, and the high-frequency oscillation circuit device is driven by the power supply circuit device. When the high-frequency high voltage is generated by the step-up transformer by the output and applied to the needle-like electrode of the discharge electrode via the high-voltage cable, the output of the high-frequency oscillation circuit device is output by the timer circuit device. Periodically turned on, and wherein the turning off.

  In the present invention, the step-up transformer of the high-frequency and high-voltage generator may be a winding transformer or a piezoelectric transformer.

  Moreover, the acicular electrode of the discharge electrode and the high voltage cable can be connected via a capacitor.

  Further, the discharge electrode, the high-frequency and high-voltage generator, the high-voltage cable and the blower are built in one housing, the housing is provided with an air inlet and an air outlet, and the blower is disposed at the air inlet. Further, the discharge electrode may be provided at the air outlet, and air ions generated by the needle electrode of the discharge electrode may be transferred by an air flow generated by the blower.

  In the present invention, a discharge electrode may be incorporated in the air passage of an air nozzle that ejects compressed air, and air ions generated by the needle-like electrode of the discharge electrode may be transferred by an air jet from the air nozzle.

  The frequency at which the high-voltage output of the high-frequency high-voltage generator is turned on and off is in the range of 10 to 1,000 Hz, and the ratio (duty ratio) of the output on period in one cycle is in the range of 0.4 to 0.9. be able to.

  According to the present invention, it is possible to provide an ion generator that can suppress the generation of ozone concentration while reducing the generation of effective air ions, while maintaining a good static elimination time, and to expand the spread of high-frequency corona discharge ion generators. can do.

  FIG. 1 is a schematic configuration diagram of an ion generation device according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a time change of a high voltage output of a high frequency high voltage generator, and FIG. 3 is a diagram of a fourth embodiment. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is a sectional view showing the schematic configuration of the ion generating apparatus of the fifth embodiment. FIG. 6 is an explanatory diagram illustrating a schematic configuration of the ion generating apparatus according to the sixth embodiment in partial cross section.

  As shown in FIG. 1, the ion generator 1 of the first embodiment includes a discharge electrode 2, a high-frequency and high-voltage generator 3, and a high-voltage cable 4. In the discharge electrode 2, one or a plurality of conductive needle-like electrodes 6 are fitted in an electrode member 5, and a conductive ground electrode 7 is provided so as to face the needle-like electrode 5. The high frequency high voltage generator 3 includes a power supply circuit device 8, a high frequency oscillation circuit device 9, a step-up transformer 10, and a timer circuit device 11. The high frequency oscillation circuit device 9 is driven by the power supply circuit device 8, and the high frequency oscillation circuit device. 9 generates a high frequency high voltage in the step-up transformer 10 and applies it to the needle electrode 6 of the discharge electrode 2 via the high voltage cable 4. At this time, the timer circuit device 11 Thus, the output of the high-frequency oscillation circuit device 3 is periodically turned on and off.

  As shown in FIG. 2, the high-frequency high-voltage output of the high-frequency high-voltage generator 3 has an on period Ton (sec) and an off period Toff (sec) in a certain period T (sec), and the output in the on period Ton. Is a high frequency high voltage of several tens of kHz, and the output in the off period Toff is zero. Here, the reciprocal (1 / T) of the period T during which the output is turned on and off is represented as an on / off frequency f, and the ratio δ (Ton / T) of the on period Ton in the period T is referred to as a duty ratio.

  According to the present invention, such a high-frequency high voltage that pauses periodically is applied to the needle-like electrode 6 of the discharge electrode 2 to generate corona discharge in the needle-like electrode 6 so as to generate positive and negative air. Generate ions.

  In the ion generator 1 of the first embodiment, the step-up transformer 10 of the high-frequency and high-voltage generator 3 may be a winding transformer or a piezoelectric transformer.

  Next, with reference to FIG.3 and FIG.4, the ion generator 1a of 2nd Embodiment shows the shape of the said discharge electrode 2a as a rod shape, for example. In the discharge electrode 2 a, a plurality of metal current collecting rings 14 are arranged at regular intervals on the outer periphery of an insulating material 13 that covers the core wire 12 of the high-voltage cable 4, and an outer case 15 made of an insulating material is disposed outside the current collecting ring 14. The needle-like electrode 6 is inserted into the current collecting ring 14 from the outside of the case 15, and end flanges 16 and lead flanges 17 are disposed at both ends of the case 15. The ground electrode 7 is fixed to the flange 17, and the needle electrode 6 and the ground electrode 7 are configured to face each other. Here, the core wire 5 and the current collecting ring 14 of the high-voltage cable 4 form a double cylindrical capacitor via an insulating material 13, and the core wire 5 and the current collecting ring 14 are electrically connected with a small capacity. By combining, the discharge current from the needle-like electrode 6 can be limited to a safe range.

  In the ion generating apparatus 1b of the third embodiment of the present invention, as shown in FIG. 5, the discharge electrode 2b, the high-frequency and high-voltage generator 3, the high-voltage cable 4 and the blower 19 are built in one casing 18. The casing 18 is provided with an air inlet 20 and an air outlet 21, the blower 19 is disposed at the air inlet 20, the discharge electrode 2 b is provided at the air outlet 21, and the discharge electrode 2 b The air ions generated by the needle-shaped electrode 6 are transferred by the air flow generated by the blower 19.

  In the ion generator 1c according to the fourth embodiment of the present invention, as shown in FIG. 6, the discharge electrode 2c is provided in the air passage 24 of the air nozzle 23 that is supplied with compressed air from the compressed air tube 22 and ejects the compressed air. Built-in and air ions generated by the needle-like electrode 6 of the discharge electrode 2c are transferred by an air jet from the air nozzle 23.

  Next, the static elimination characteristics and the ozone generation characteristics of the ion generator configured as described above will be described.

  As the ion generating device, for example, an ion generating device 1b that transfers air ions with the blower of the third embodiment is used. FIG. 7 shows the configuration of a test apparatus that measures the static elimination characteristics of the ion generation apparatus, and FIG. 8 shows the configuration of the test apparatus that measures the ozone generation characteristics of the ion generation apparatus.

  Regarding the charge removal characteristics, the charge removal time was measured using a charged plate monitor in FIG. In the charging plate monitor 25, a 150 mm square metal plate (charging object) 27 is attached to a main body 26 via an insulator 28. The metal plate 27 simulates a charged object to be neutralized. The main body 26 includes a surface potential measuring device 29, a high voltage power supply 30, and a timer 31, and can apply charges to the metal plate 27 using the high voltage power supply 30. The voltage can be measured by the surface potential measuring device 29 and the time during which the voltage decays (static elimination time) can be measured by the timer 31.

  As shown in FIG. 7, an ion generator 1b is installed on a table, a charged plate monitor 25 is placed on the front surface at a distance of L = 300 mm, and air containing air ions from the ion generator 1b is charged to the charged plate monitor. Spray 25 metal plates 27. The metal plate 27 is charged to ± 1,000 V by a high voltage power supply 30, neutralized by supplying air ions from the ion generator 1 b to this, and the decay time (static elimination time) required to decrease to ± 100 V is a timer. 31 can be measured.

  About the ozone production | generation characteristic, the ozone concentration was measured using the atmospheric ozone concentration meter in FIG. As shown in FIG. 8, the ion generator 1b was installed on the table, the sampling tube 33 of the atmospheric ozone densitometer 32 was placed on the front surface, at a distance of L = 300 mm, and the ozone concentration was measured.

The specification of the ion generator 1b is that the high-frequency and high-voltage generator employs a piezoelectric transformer, and its output is a voltage of 7 kVp-p and a frequency of 68 kHz. The blower is a motor fan with a diameter of 12cm, and the entire front is an air outlet. The maximum air volume is 3.3m ³ / min, and the air volume can be changed continuously, so we changed it to three stages: large, medium and small. The test parameters were a frequency f at which the high voltage output was stopped and an on / off duty ratio δ.

  9 and 10 show the relationship between the static elimination time and ozone concentration of the ion generator and the frequency f. When the frequency f is in the range of 10 Hz to 1,000 Hz, the higher the frequency f, the shorter the static elimination time and the lower the ozone concentration. The frequency of sound that humans can perceive is from 20Hz to 20kHz, and the sensitivity is particularly good from 1,000Hz to 3,500Hz, so the frequency f should not exceed 1,000Hz so as not to generate a noisy sound. .

  11 and 12 show the relationship between the ionization time and ozone concentration of the ion generator and the duty ratio δ. The static elimination time shows a characteristic having a minimum value in the vicinity of the duty ratio δ = 0.8. On the other hand, the ozone concentration decreases as the duty ratio δ decreases. The ozone concentration is considered to be simply proportional to the on period. The duty ratio δ can be selected to be large when priority is given to the static elimination time and smaller when priority is given to the ozone concentration.

  From the above knowledge, in the ion generator 1d according to the fifth embodiment of the present invention, the frequency when the high-voltage output of the high-frequency high-voltage generator 3 is stopped is in the range of 10 to 1,000 Hz, and within one cycle. The ratio of the output ON period (duty ratio) is in the range of 0.4 to 0.9.

The schematic block diagram of the ion generator of 1st Embodiment. Explanatory drawing which shows the time change of the high voltage output of the high frequency high voltage generator of this invention. Explanatory drawing shown in the partial cross section with the schematic structure figure of the discharge electrode of 2nd Embodiment. IV-IV sectional view taken on the line of FIG. Explanatory drawing which showed the schematic structure of the ion generator of 3rd Embodiment in the cross section. Explanatory drawing which showed the schematic structure of the ion generator of 4th Embodiment in the partial cross section. The schematic block diagram of the apparatus which measures the static elimination characteristic of an ion generator. The schematic block diagram of the apparatus which measures the ozone production | generation characteristic of an ion generator. The figure which shows the static elimination characteristic of the ion generator of this invention, and the relationship of a frequency. The figure which shows the ozone generation characteristic of the ion generator of this invention, and the relationship of a frequency. The figure which shows the relationship between the static elimination characteristic and duty ratio of the ion generator of this invention. The figure which shows the relationship between the ozone generation characteristic of the ion generator of this invention, and a duty ratio.

Explanation of symbols

  1, 1a, 1b, 1c, 1d ... ion generator, 2, 2a, 2b, 2c ... discharge electrode, 3 ... high frequency high voltage generator, 6 ... acicular electrode, 7 ... Ground electrode, 8 ... power circuit device, 9 ... high frequency oscillation circuit device, 10 ... step-up transformer, 11 ... timer circuit device, 12 ... core wire, 14 ... current collecting ring, 19 ... Blower, 23 ... Air nozzle.

Claims (7)

Consists of a discharge electrode, a high-frequency high-voltage generator, and a high-voltage cable, and the discharge electrode is composed of one or a plurality of conductive needle electrodes and a conductive ground electrode provided to face the needle electrodes In an ion generator that applies a high-frequency high-voltage output of the high-frequency high-voltage generator to the needle-like electrode of the discharge electrode, generates a corona discharge with the needle-like electrode, and generates positive and negative air ions ,
The high-frequency high-voltage generator includes a power supply circuit device, a high-frequency oscillation circuit device, a step-up transformer, and a timer circuit device. The high-frequency oscillation circuit device is driven by the power supply circuit device, and the step-up transformer is output by the output of the high-frequency oscillation circuit device. When the high-frequency high voltage is generated by this and applied to the needle electrode of the discharge electrode via a high-voltage cable, the output of the high-frequency oscillation circuit device is periodically turned on and off by the timer circuit device. An ion generation apparatus characterized by:   2. The ion generator according to claim 1, wherein the step-up transformer of the high-frequency and high-voltage generator is a piezoelectric transformer.   2. The ion generator according to claim 1, wherein the step-up transformer of the high-frequency and high-voltage generator is a winding transformer.   The ion generator according to any one of claims 1 to 3, wherein the acicular electrode of the discharge electrode and the high-voltage cable are connected via a capacitor.   5. The ion generation apparatus according to claim 1, wherein the discharge electrode, the high-frequency and high-voltage generation device, the high-voltage cable, and the blower are built in a single casing, and an air intake port and an air outlet are provided in the casing. A blower is provided at the air intake, the discharge electrode is provided at the air outlet, and air ions generated by the needle-like electrode of the discharge electrode are transferred by an air flow generated by the blower. An ion generator characterized by the above.   5. The ion generation apparatus according to claim 1, wherein a discharge electrode is built in an air passage of an air nozzle for ejecting compressed air, and air ions generated by the needle electrode of the discharge electrode are supplied to the air nozzle. The ion generating apparatus is transported by an air jet from 7. The ion generator according to claim 1, wherein the high-frequency output of the high-frequency high-voltage generator is turned on and off at a frequency in the range of 10 to 1,000 Hz, and the output in one cycle is turned on. The ion generation apparatus characterized in that the ratio (duty ratio) of the period to perform is in the range of 0.4 to 0.9.

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