JP4645204B2 - Electrostatic atomizer - Google Patents

Description

  The present invention relates to an electrostatic atomizer that sprays ion mist.

  Conventionally, as an electrostatic atomizer, a water reservoir, an electrode that sucks and holds water from the water reservoir and electrostatically atomizes the water, a counter electrode installed to face the electrode, and an electrode There is known an electrostatic atomizer that includes a voltage application unit that applies a high voltage between a unit and a counter electrode, and generates ion mist by electrostatically atomizing water at the electrode unit (for example, Patent Document 1).

  In this electrostatic atomizer, when the high voltage is applied between the electrode part and the counter electrode by the voltage application part, the water held in the electrode part receives a large energy from the high voltage and exceeds the surface tension. As a result of Rayleigh splitting, the nanometer-sized ion mist with active species rich in reactivity is scattered from the electrode section toward the counter electrode, which creates room air and wall surfaces. This is to deodorize the deposits.

  By the way, in the electrostatic atomizer as described above, ozone is generated when nano-sized ion mist is generated. General ozone generation is

It is represented by However, e represents an electron, O. represents an oxygen radical, and M ₁ represents O., O ₂ or O ₃ .

Ozone has an adverse effect on the human body when its concentration increases, and since the ozone concentration in the room is set to be 0.06 ppm or less of the environmental standard value, dilution with a fan is performed. However, dilution with a fan does not provide a fundamental solution, and the ozone concentration may be 0.02 ppm or more when used for a long time, which may cause discomfort. It was necessary to do.
Japanese Patent No. 3260150

  The present invention was invented in view of the above-described conventional problems, and the object of the present invention is to provide a static that can decompose ozone generated when water is electrostatically atomized to generate ion mist. An object of the present invention is to provide an electroatomizing device.

In the electrostatic atomizer according to claim 1 to solve the above problems, an electrode unit 1 for electrostatically atomizing the water holds the water, the electrodes portion 1 and the counter electrode 2 high voltage and a voltage applying unit 3 for applying a static to scatter the ozone generated water in the electrode part 1 in which the ion mist and the electrostatic atomization that is generated by electrostatic atomization during The atomization apparatus includes an ozone decomposition catalyst 4 for decomposing ozone generated when water is electrostatically atomized, and the ozone decomposition catalyst 4 is arranged on the side of the electrode unit 1 in the direction of scattering ion mist and ozone. It is characterized by being provided. By setting it as such a structure, it becomes possible to decompose | disassemble the ozone which generate | occur | produces when water is electrostatically atomized by the ozone decomposition catalyst 4. FIG.
The electrostatic atomizer according to the first aspect of the present invention further includes a counter electrode 2 disposed so as to face the electrode unit 1, and the high voltage application unit 3 includes the electrode unit 1 and the counter electrode 2. A high voltage may be applied between the two.

The invention of claim 3 is characterized in that, in the invention of claim 1 or claim 2, a hydrophobic metal material is provided as the ozone decomposition catalyst 4. By adopting such a configuration, the ion mist generated by electrostatic atomization is prevented from adsorbing on the surface of the ozone decomposition catalyst 4, and effective ion mist that contributes to deodorization of deposits such as indoor air and indoor wall surfaces. Can be reduced.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the ozone decomposition catalyst 4 is formed in a honeycomb shape, a punching metal shape or a wire mesh shape, or a honeycomb shape or The ozone decomposing catalyst 4 is attached to the surface of a punched metal or wire mesh substrate. By setting it as such a structure, the exposed area of the ozone decomposition catalyst 4 becomes large and a catalyst function improves.

The invention of claim 5 is characterized in that, in the invention of claim 2 or claim 3 , the ozone decomposition catalyst 4 is attached to the surface of the counter electrode 2. By setting it as such a structure, it becomes possible to comprise an electrostatic atomizer, without increasing a number of parts.

  In the present invention, ozone generated when water is electrostatically atomized to generate ion mist can be decomposed by an ozone decomposition catalyst, and even if electrostatic atomization is performed indoors for a long time. The ozone concentration can be reduced.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. First, the basic configuration and operation of the electrostatic atomizer will be described.

  As shown in FIG. 1 and the like, the electrostatic atomization device sucks up and holds the water W in the water reservoir T for storing the water W to be electrostatically atomized and holds the water W at the tip of the electrostatic fog. The main body is composed of the electrode unit 1 to be converted, the counter electrode 2 installed so as to face the electrode unit 1, and the voltage application unit 3 for applying a high voltage between the electrode unit 1 and the counter electrode 2 .

  The water reservoir T is composed of a tank of φ60 mm × 60 mm. The electrode portion 1 is a rod-shaped rod made of a porous material such as porous ceramic or a member having pores. The electrode portion 1 sucks up the water W in the water reservoir T from the lower end portion, and water is applied to the tip portion by capillary action. While conveying W, the water W is hold | maintained inside. One electrode part 1 may be arranged at the center of the water reservoir T, or may be arranged at a plurality (for example, six) of concentric circles centered on the center of the water reservoir T at equal intervals. In the present embodiment, the electrode unit 1 retains water W inside and can be transported to a pointed tip. However, the electrode unit 1 is cooled by a cooling device using a Peltier element or the like. Then, the water in the air may be condensed to supply water. The counter electrode 2 is made of a synthetic resin mixed with a conductive material such as carbon or a metal such as SUS. In the present embodiment, the counter electrode 2 has a ring shape, and each portion of the ring-shaped counter electrode 2 is an electrode portion 1. It arrange | positions in the state which opposes so that it may become equal distance from the pointed part of.

  When a high voltage (for example, 6 kV) is applied between the electrode unit 1 and the counter electrode 2 by the voltage application unit 3 while the water W is held in the electrode unit 1, Electrostatic atomization that causes Rayleigh splitting in which water W receives large energy due to high voltage and repeats splitting exceeding the surface tension, and generates ion mist (for example, 10 to 30 nm) having a nanometer size particle diameter is performed. At the same time, active species that are produced at the same time (hydroxyl radical, superoxide and other deodorizing / sterilizing substances) are contained in the split ion mist and scattered, A high voltage is applied between the pointed portion and the counter electrode 2, and the generated ion mist is in a state substantially in line with the electric force lines from the pointed portion of the electrode portion 1 toward the counter electrode 2. It is distributed.

  Since the ion mist generated in this way contains active species that are very reactive as described above, it deodorizes deposits such as indoor air and indoor wall surfaces.

  In the present invention, the ozone decomposition catalyst 4 is disposed on the scattering direction side (that is, the counter electrode 2 side) from the electrode portion 1 in order to decompose ozone generated when the water W is electrostatically atomized as described above. To do.

  As a material of the ozonolysis catalyst 4, noble metals such as platinum (Pt), gold (Au), palladium (Pd), silver (Ag), rhodium (Rh), iridium (Ir), osmium (Os), iron ( Examples thereof include base metals such as Fe), manganese (Mn), nickel (Ni), cobalt (Co), and chromium (Cr), but are not particularly limited.

  The ozone decomposition by the ozone decomposition catalyst 4

Or

Or

It is represented by M ₂ represents the ozone decomposition catalyst 4.

  As the shape of the ozone decomposition catalyst 4, the honeycomb-shaped ozone decomposition catalyst 4a shown in FIG. 1, the punching metal-like ozone decomposition catalyst 4b shown in FIG. 2, the wire mesh-like ozone decomposition catalyst 4c shown in FIG. 1 to 3 may be one in which the ozone decomposition catalyst 4 is attached to the surface of the substrate having the shape shown in FIGS. As a base material in the case where the ozone decomposition catalyst 4 is attached to the surface of the base material to form a honeycomb shape, a monolith support base material or a metal support base material made of a heat-resistant inorganic oxide such as cordierite, alumina, silica, A catalyst carrying layer comprising one or more of zirconia, titania, silica-alumina, zeolite, etc. is used. At this time, if a hydrophobic material is used for the catalyst carrying layer, a catalyst by adsorption of ion mist is used. Deterioration can be prevented.

  By forming the ozone decomposition catalyst 4 in the shape as described above, the exposed area of the ozone decomposition catalyst 4 is increased and the catalytic function is improved.

  Further, the ozone decomposition catalyst 4 may be attached to the surface of the counter electrode 2. As shown in FIG. 4, the ozone decomposition catalyst 4 may be attached to one side of the counter electrode 2 having an annular plate shape, or the ozone decomposition catalyst 4 may be attached to both sides thereof. The counter electrode 2 can be formed as one component, and an electrostatic atomizer can be configured without increasing the number of components.

  In addition, since the metal used for the ozone decomposition catalyst 4 as described above has hydrophobicity, it is possible to suppress the ion mist generated by electrostatic atomization from being adsorbed on the surface of the ozone decomposition catalyst 4. It can suppress that the effective ion mist which contributes to deodorization of deposits, such as a wall surface, reduces.

  Below, the comparative experiment performed using the electrostatic atomizer as shown in FIG. 1 is demonstrated. In addition, the electrode part 1 is arrange | positioned on the concentric circle centering on the center of the water reservoir part T at six equal intervals.

  The comparative experiments were as follows: (A) the one using no ozone decomposition catalyst, (B) one using a honeycomb-shaped manganese catalyst of φ70 mm × 10 mmL (200 cells / inch) as the ozone decomposition catalyst 4a, (C) the ozone decomposition catalyst As 4a, three types were carried out: 4 g / L of platinum supported on a honeycomb substrate made of 53 mm × 56 mm × 28 mmL (300 cells / inch) SUS. In each case, the ozone concentration at a position 5 mm downstream from the counter electrode 2 of the electrostatic atomizer is measured, and the particle size-number distribution of the generated ion mist is determined by the DMA device (differential type electric transfer). Measured with a degree measuring device).

  As a result, when the ozone decomposition catalyst (A) was not used, the ozone concentration was 0.20 to 0.25 ppm, whereas when the manganese catalyst (B) was used, the ozone concentration was 0.2. In the case of less than 01 ppm and using the platinum catalyst of (C), it was 0.005 to 0.015 ppm, and it was confirmed that the ozone concentration was reduced.

  In addition, the particle size-number distribution of the generated ion mist was as shown in FIG. In the figure, A indicates the distribution in (A), B indicates the distribution in (B), and C indicates the distribution in (C).

  From this distribution, it can be seen that the number of ion mist decreases when the manganese-based catalyst (B) is used. This is considered to be because the air permeability of the ozone decomposition catalyst 4a is poor. When the ozone decomposing catalyst (A) is not used and when the platinum catalyst (C) is used, the distribution is good with a particle size of 15 to 16 nm as a peak.

  When the platinum catalyst (C) is used, the number of ion mists is larger than when the platinum catalyst (A) is not used. This is because the platinum catalyst (C) is placed in contact with the counter electrode 2. This is probably because the ion mist was pulled by the platinum catalyst.

It is a block diagram of an example of the electrostatic atomizer of this invention. It is a block diagram of the other example of the electrostatic atomizer of this invention. It is a block diagram of the further another example of the electrostatic atomizer of this invention. It is a block diagram of the further another example of the electrostatic atomizer of this invention. It is a particle size-number distribution of the ion mist produced | generated in a comparative experiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode part 2 Counter electrode 3 Voltage application part 4 Ozone decomposition catalyst T Water reservoir W Water

Claims (5)

An electrode portion which the water is electrostatically atomized holds the water, and a voltage applying unit for applying a high voltage to the electrodes portion, the ion mist generated water is electrostatically atomizing at electrode portions In the electrostatic atomizer that disperses ozone generated when the electrostatic atomization is performed,
Characterized by comprising an ozone decomposition catalyst for decomposing ozone generated water when electrostatically atomizing, made by arranging the ozone decomposition catalyst in the direction which causes scattering of ion mist and ozone from said electrode portion An electrostatic atomizer.   A counter electrode arranged to face the electrode part;
The high voltage application unit applies a high voltage between the electrode unit and the counter electrode.
The electrostatic atomizer according to claim 1.   The electrostatic atomizer according to claim 1 or 2, wherein a hydrophobic metal material is provided as an ozonolysis catalyst.   2. The ozone decomposition catalyst is formed in a honeycomb shape, a punching metal shape, or a wire mesh shape, or an ozone decomposition catalyst is attached to the surface of a substrate having a honeycomb shape, a punching metal shape, or a wire mesh shape. The electrostatic atomizer as described in any one of thru | or 3 thru | or 3.   4. The electrostatic atomizer according to claim 2, wherein an ozonolysis catalyst is attached to the surface of the counter electrode.

Images