JP2007087708A - Ion generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion generating device capable of cutting off an ozone volume, and at the same time, increasing a volume of ion emission. <P>SOLUTION: The device is provided with a dielectric 12, and a high-voltage electrode 13 and a grounding electrode 14 opposed to each other, as well as a high-voltage power source 15 and a heater power source 16 between the high-voltage electrode and a ground 17, and at either end of the grounding electrode 14. With this, corona discharge is generated between the high-voltage electrode 13 and the grounding electrode 14, and ion is emitted. The grounding electrode 14 is made of a nichrome wire, and is heated by supply of voltage of the heater power source 16. Further, the dielectric 12 uses a mica material with a little change of a dielectric constant even by temperature rise, so that a voltage between the high-voltage electrode 13 and the grounding electrode 14 can be kept high. Since the mica material is used as the dielectric 12, it won't be broken even at high temperature, so that the dielectric 12 can be kept at high temperature enabling emission of a large volume of ion and promotion of ozone degradation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ion generator using a corona discharge element.

  Conventionally, an ion generator using a corona discharge element that generates negative ions and sterilizes mold in the air for the purpose of purifying the air in a garbage disposal machine, room air, etc. Various proposals have been made (Patent Documents 1, 2, etc.). An ion generator using such a corona discharge element performs corona discharge using a dielectric, a high-voltage electrode and a ground electrode sandwiching the dielectric, and thereby ionizes moisture in the air to generate ions. It is.

  However, if discharge is performed using a corona discharge element, ozone harmful to the human body is generated simultaneously with the generation of the ions. Therefore, a method and an apparatus for removing this are disclosed (Patent Documents 1, 2, etc.).

Patent Document 1 discloses a corona discharge element that suppresses the generation of ozone by forming a discharge electrode with a resistor and heating it by passing a current therethrough. Further, this patent document 1 discloses that “a dielectric containing itself or a base material made of a fine ceramic, and a paste containing a metal that forms a metallized layer when an induction electrode and a discharge electrode are integrally sintered with a ceramic such as tungsten. Using this, it is possible to produce even a complicated pattern by screen printing ".
In Patent Document 2, for example, the induction electrode is formed of an aluminum metal substrate to improve the mechanical strength of the device, the dielectric layer is formed of a thin film, and the discharge electrode is an area of the electrode portion of each linear electrode. An ion generator is disclosed in which the amount of ozone generated during discharge is reduced by forming it on a dielectric layer so as to be smaller than the area of the non-electrode portion and lowering the discharge voltage.
JP 2002-373760 A JP 2004-273315 A

  However, when the inventor confirmed by experiment using “a paste containing a metal that forms a metallized layer when sintered integrally with a ceramic such as tungsten” described in Patent Document 1 as a dielectric, When a high current is applied, the dielectric may be destroyed, or the dielectric constant due to temperature rise may be reduced, making it difficult to discharge.

  Patent Document 2 discloses an ion generator that reduces the amount of ozone, but does not disclose means for increasing the amount of ions to be released.

  Therefore, an object of the present invention is to provide an ion generator capable of reducing the amount of ozone generated by corona discharge and simultaneously increasing the amount of ions released.

  The present invention is configured as follows.

(1) The present invention
A dielectric,
An ion generator comprising a corona discharge element having a high-voltage electrode and a ground electrode facing each other,
Means for heating the dielectric,
The dielectric is characterized in that the dielectric constant in a range of 25 [° C.] to 150 [° C.] is a material having a variation of 10% or less based on the value of the dielectric constant when the dielectric constant is 25 [° C.].

According to the present invention, there is provided means for heating the dielectric, and when the temperature of the dielectric is increased, the amount of ions generated increases, ozone decomposition can be promoted, and the ozone concentration can be reduced. . Further, since the dielectric is made of a material within 10% on the basis of the value of the dielectric constant when the variation of the dielectric constant at 25 [° C.] to 150 [° C.] is 25 [° C.] Even when the body is heated, the amount of increase in the dielectric constant of the dielectric is small, so that the discharge is stable and the dielectric is less likely to break. Further, since the change in the dielectric constant due to the temperature rise is small, the voltage between the terminals of the high voltage electrode and the ground electrode is less likely to decrease and the amount of ion generation is reduced.
Therefore, since the dielectric can withstand high temperatures and the inter-terminal voltage is less likely to decrease, a large amount of ions can be generated and the generation of ozone can be effectively suppressed.

  On the other hand, in the conventional apparatus, if the dielectric is heated to a high temperature, the voltage between the terminals decreases, so that it is practically difficult to raise the temperature of the dielectric, such as requiring an impractical power supply unit. . Therefore, it is practically difficult to increase the ion generation amount, and the amount of ozone released into the air as in the present invention cannot be reduced.

(2) The present invention
A dielectric,
An ion generator comprising a corona discharge element having a high-voltage electrode and a ground electrode facing each other,
The dielectric includes a mica material as a main component,
The ground electrode is formed of nichrome wire,
Furthermore, a ground electrode heating means for heating by supplying a current to the ground electrode is provided.

According to the present invention, since the nichrome wire is used as described above, a high current can be passed through the ground electrode, so that the temperature of the ground electrode can be increased. Thereby, discharge becomes easy to occur, and the amount of generated ions increases.
In addition, since the mica material is used as the dielectric, which has a small change in dielectric constant due to temperature, even when a high current is applied for a long time, the increase in the dielectric constant of the dielectric is small, so the discharge is stable. There is no risk of the dielectric breaking. Further, since the change in the dielectric constant due to the temperature rise is small, the voltage between the terminals of the high voltage electrode and the ground electrode does not drop and the amount of generated ions does not decrease.

  Therefore, since the dielectric can withstand high temperatures and the inter-terminal voltage is less likely to decrease, a large amount of ions can be generated and the generation of ozone can be effectively suppressed.

  According to the present invention, in an ion generator using a corona discharge element, the amount of harmful ozone can be reduced and the amount of ions generated can be increased. Further, even if a high current is passed through the dielectric for a long time, there is no possibility that the dielectric is destroyed.

  The ion generator of this embodiment is demonstrated using FIG. FIG. 1 is a schematic configuration diagram and an electric circuit diagram of the ion generator of the present embodiment.

  First, the schematic configuration of the apparatus according to the present embodiment will be described with reference to FIGS. FIG. 1A is a configuration diagram of the apparatus of this embodiment, and FIG. 1B is a component diagram of the substrate of the corona discharge element 10 of this apparatus. The ion generator 1 is a part of a deodorizing apparatus for waste treatment and has the following configuration. That is, the dielectric 12, the high-voltage electrode 13 fixed to the upper surface of the dielectric 12, the ground electrode 14 sandwiched inside the dielectric 12, and the high-voltage power supply 15 described later in the description of FIG. A heater power supply 16 and a ground 17 are provided.

The dielectric 12 shown in FIG. 1A uses mica as a main component in the apparatus of this embodiment. The mica material has a feature that the change in the dielectric constant due to temperature rise is small, so that the discharge between the high-voltage electrode 13 and the ground electrode 14 is stable, and there is no possibility that the dielectric is destroyed.
Further, as shown in FIGS. 1A and 1B, the corona discharge element 10 is obtained by bonding an upper layer substrate 10A and a lower layer substrate 10B, which are substrates based on a two-layer dielectric 12. A high voltage electrode 13 is fixed to the upper substrate 10A. A ground electrode 14 formed in a rectangular wave shape is fixed to the lower substrate 10B.
The high-voltage electrode 13 shown in FIGS. 1A and 1B comprises an electrode made of a metal-containing paste or platinum that forms a metallized layer when sintered integrally with a ceramic such as tungsten.
The ground electrode 14 is made of a nichrome wire that can flow a high current.

Next, the electrical configuration of the ion generator 1 of the present embodiment, particularly the electrical configuration of the corona discharge element 10 will be described with reference to FIG. FIG. 1C is a diagram showing an electric circuit of the ion generator 1 of the present embodiment shown in FIG.
As shown in FIG. 1C, a corona discharge element 10 as shown in FIG. 1A includes a dielectric 12, a ground electrode 14 sandwiched inside, and a high-voltage electrode facing the ground electrode 14. 13. Further, the ion generator 1 includes a high voltage power source 15 that applies a high voltage between the high voltage electrode 13 and the earth 17, and a heater power source 16 that supplies a voltage to both ends of the ground electrode 14 to raise the temperature of the ground electrode 14. It has.

The high voltage power supply 15 in FIGS. 1A and 1C supplies a predetermined AC voltage or pulse voltage between the high voltage electrode 13 and the ground 17 using a transformer (not shown) and a stabilized power supply.
The heater power supply 16 in FIGS. 1A and 1C supplies a predetermined voltage to both ends of the ground electrode 14 using a transformer, a rectifier circuit, and a stabilized power supply (not shown). The heater power supply 16 can raise the temperature of the ground electrode 14, generate more ions, and promote the decomposition of harmful ozone. Further, as shown in FIG. 1C, the heater power supply 16 includes a temperature detection unit 161 and a temperature control unit 162. The temperature controller 162 monitors the temperature by a temperature detector 161 (not shown) and controls the voltage supplied to the ground electrode 14.
The ground 17 in FIGS. 1A and 1C is connected to an external ground terminal using, for example, a power cord with a ground terminal.

Next, the function of the ion generator 1 will be described in more detail using the same FIG. A high voltage is applied to the corona discharge element 10 from the high voltage power supply 15, and a corona discharge of about several μA occurs between the high voltage power supply 15 and the ground electrode 14, and molecules contained in the surrounding air are decomposed into ions. To do. When this corona discharge is performed, not only ions but also ozone is generated. In order to reduce the generation of ozone, the apparatus 1 of this embodiment includes a heater power source 16 that heats the ground electrode 14. That is, a voltage is applied to both ends of the ground electrode 14 by the heater power supply 16 to the ground electrode 14, and the temperature of the ground electrode 14 made of nichrome wire rises. By this temperature rise, decomposition of ozone generated by corona discharge is promoted, and release of ozone into the air can be reduced. Moreover, the amount of ions released into the air can be increased simultaneously with the decomposition of ozone by the temperature rise of the dielectric 12 (see FIG. 3 described later). And by generation | occurrence | production of this ion, it becomes possible to decompose | disassemble the mold | fungi in the air and can exhibit the deodorizing effect. Furthermore, in the apparatus 1 of the present embodiment, as described above, since the nichrome wire is used as the ground electrode 14, a high current can be passed and the temperature of the ground electrode 14 can be increased efficiently.
Even if the ground electrode 14 is configured in this manner, the dielectric 12 is made of mica that has a small change in dielectric constant even when the temperature rises. There is no risk of the body 12 being destroyed. Hereinafter, this will be described with reference to FIG.

  With reference to FIG. 2, the ceramic used previously and the present embodiment regarding the relationship between the surface temperature of the dielectric 12, the capacitance of the dielectric 12, and the voltage between the terminals of the high-voltage electrode 13 and the ground electrode 14 are described. Compared to the mica used in the explanation. FIG. 2A shows the relationship between the surface temperature of the dielectric 12 and the capacitance of the dielectric 12 in a table and a graph. FIG. 2B shows the relationship between the surface temperature of the dielectric 12 and the voltage between the terminals in a table and a graph.

As shown in FIG. 2A, in the case where a conventional ceramic is used as the dielectric 12, the capacitance increases greatly when the temperature of the dielectric 12 rises, particularly at 100 ° C. or higher. I understand. On the other hand, in the apparatus of this embodiment, mica is used as the dielectric 12, and it can be seen that the dielectric constant hardly changes even when the temperature rises.
As shown in FIG. 2B, when a conventional ceramic is used as the dielectric 12, the voltage between the high-voltage electrode 13 and the ground electrode 14 decreases to half or less as the temperature rises. In the apparatus of this embodiment, mica is used as the dielectric 12, and it can be seen that the voltage between the terminals hardly changes even when the temperature rises.

As described above with reference to FIG. 2, the voltage between the terminals of the high-voltage electrode 13 and the ground electrode 14 hardly changes even when the temperature rises. Therefore, the voltage between the terminals can be maintained without using a high-voltage power supply 15 having a high voltage. . Here, the amount of ions generated can generally be increased as the temperature of the dielectric 12 is higher and the voltage between the terminals is higher. According to the apparatus 1 of the present embodiment, the temperature of the dielectric 12 can be increased and the voltage between the terminals can be maintained high, so that the amount of generated ions can be increased. Further, since the surface temperature of the dielectric 12 can be increased as shown in FIG. 2, decomposition of generated ozone can be promoted, and the concentration of ozone harmful to the human body can be kept low.
On the other hand, in the conventional ceramic, the voltage between the terminals of the high-voltage electrode 13 and the ground electrode 14 is reduced to less than half as described above due to the temperature rise, so it is not practical to raise the temperature of the dielectric 12. If the high-voltage power supply 15 is not provided, the amount of generated ions may be reduced. Further, in the conventional apparatus as described above, since there is a fact upper limit for raising the temperature of the dielectric 12, it is not possible to keep the ozone concentration harmful to the human body low.

  Next, with reference to FIG. 3, an experimental result when the ion generator of the present embodiment is used is shown. FIG. 3A shows a table showing the relationship between the heater current 101 supplied to the ground electrode 14, the ion generation amount, and the ozone generation amount when the ion generation apparatus of the present embodiment is used. As shown in the lower column, the experiment is performed by increasing the heater current 101 supplied to the ground electrode 14. FIG. 3B is a graph showing the relationship between the surface temperature of the dielectric and the amount of ions generated based on the data in the table of FIG. FIG. 3C is a graph showing the relationship between the surface temperature of the dielectric and the amount of ozone generated based on the data in the table of FIG.

  As shown in FIG. 3A, as the heater current 101 increases, the dielectric surface temperature 102 increases. Further, as shown in FIG. 3B, it can be seen that the number 104 of negative ions and the total number 105 of generated ions, which are the sum of these, increase with this temperature rise. Further, as shown in FIG. 3C, it can be seen that the concentration 106 of the generated ozone decreases dramatically as the heater current 101 increases.

In addition, although the apparatus of this embodiment is provided with the temperature detection part 161 and the temperature control part 162, it is not necessarily required if the safety of the apparatus 1 can be ensured because the current and the temperature change are known at room temperature.
The dielectric 12 that can be used in the apparatus of the present embodiment is not limited to mica, and the effects of the present embodiment can be achieved as long as the dielectric constant is less likely to vary due to temperature changes.

The schematic block diagram and electric circuit diagram of the ion generator of this embodiment are shown. The table | surface figure and graph which compared the ceramic which was used before and the mica used with the apparatus of this embodiment about the relationship between the surface temperature of a dielectric material, the electrostatic capacitance of a dielectric material, and the voltage of a dielectric material are shown. . The table | surface figure and graph showing the relationship between the heater electric current supplied to a ground electrode at the time of using the ion generator of this embodiment, the amount of ion generation, and the amount of ozone generation are shown.

Explanation of symbols

1-ion generator 10-corona discharge element 10A-upper layer substrate 10B-lower layer substrate 12-dielectric 13-high voltage electrode 14-ground electrode 15-high voltage power source 16-heater power source 161-temperature detection unit 162-temperature control unit 17- Earth 101-Heater current 102-Surface temperature of dielectric 103-Number of positive ions 104-Number of negative ions 105-Total number of generated ions 106-Concentration of generated ozone

Claims (2)

A dielectric,
An ion generator comprising a corona discharge element having a high-voltage electrode and a ground electrode facing each other,
Means for heating the dielectric,
The dielectric is a material having a variation of the dielectric constant between 25 [° C.] and 150 [° C.] within 10% based on the value of the dielectric constant when the dielectric constant is 25 [° C.]
Ion generator. A dielectric,
An ion generator comprising a corona discharge element having a high-voltage electrode and a ground electrode facing each other,
The dielectric includes a mica material as a main component,
The ground electrode is formed of nichrome wire,
In addition, it comprises a ground electrode heating means for heating by supplying a current to the ground electrode,
Ion generator.

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