JPS6029532A - Air purifier - Google Patents

Abstract

PURPOSE:To enable to reduce the ozone concentration in the discharged air by a structure wherein heaters are fitted on the blow-off port side with respect to opposed electrodes so as to allow to decompose ozone, which has produced at an ionized air generating section, by means of high temperature. CONSTITUTION:Discharge electrodes 1 are arranged on a blow-off port side in a case, on which a suction port and a blow-off port are provided. At the same time, opposed electrodes 2, which induce ionized air and simultaneously collect dusts carried by the ionized air, are arranged opposite to the electrodes 1 with discharge gap between them. In addition, potential difference is produced between the electrodes 1 and the electrodes 2 by means of high tension source 4 and, at the same time, at least ozone erasing members 3 equipped with heaters 31 are arranged on the blow-off port side with respect to the electrodes 2. Because the ozone produced at an ionized air generating section can be decomposed by means of high temperature developed by the heaters, the ozone concentration in the discharged air can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes the ionic wind (electric wind) generated when a high voltage is applied between a discharge electrode and a counter electrode (earth terminal) incorporated in an electrostatic precipitator. Regarding purifiers.

Conventional air purifiers are large because they have volumetric and gravimetric motors, fans, and ducts as components. Therefore, in the case of automobile air purifiers, installation locations are limited.
For example, if you smoke in the driver's seat, an air purifier installed on the rear board will not circulate the air inside the vehicle, and the smoke will get on your body and the seats while it reaches the rear board. The hit spreads inside the vehicle and causes low lI.
Becomes Maro. Therefore, there are problems such as the air purifier on the rear board must process the thinned smoke and the fan must have a large airflow. As an air blowing means that solves the above problem, there is a method that utilizes ion wind generated during corona spraying. This is because when the ions attach to dust in the air and charge the dust, the dust is attracted to the counter electrode and adheres to the counter electrode, so that wind generation and dust collection can be performed at the same time.

However, during corona discharge, ozone, which is harmful to the human body and emits a bad odor, is also generated. In particular, in order to generate ion wind to a practical extent, greater power is required than in the case of electrostatic precipitation alone, and the amount of ozone generated increases accordingly.

An object of the present invention is to provide an air purifier that can decompose ozone generated by the coq discharge and reduce the amount of ozone adsorbent in the exhausted air.

Another object of the present invention is to provide an air purifier equipped with an ozone decomposition catalyst for reducing ozone concentration, in which the catalyst is heated to an activation temperature to increase the effect of reducing the ozone concentration exhausted. It is provided by.

The present invention includes a case having an intake port and an outlet, a discharge electrode provided on the intake port side in the case, and a counter electrode provided opposite the discharge electrode with a discharge gap, a counter electrode that induces an ion wind and collects dust in the air carried by the ion wind; a high voltage power supply that generates a potential difference between the discharge electrode and the counter electrode; and an ozone erasing member provided with at least a heater.

The present invention will be explained below based on one embodiment shown in the drawings.

1.2.3.4.5.6 shows a first embodiment of the air purifier according to the present invention. FIG. 1 is a schematic configuration diagram, in which a needle-like or thin wire-like electrically conductive member 11 made of metal or the like is arranged in plurality or plurality in parallel at equal intervals on the same plane, and an electrode frame (not shown) The discharge current 4ii is fixed by the lead wire 12 and is electrically connected by the lead wire 12.
1, and a counter electrode 2 in which conductive flat plates 21 are arranged at equal intervals, the ends are fixed by a conductive frame, and are installed parallel to the discharge electrode at a certain interval, and formed in a honeycomb shape or the like. An electric heater 31 is provided inside an insulating material such as alumina, and manganese dioxide or platinum powder is attached to the surface 32 of the insulating material such as alumina by impregnation treatment, etc., and the honeycomb-shaped cross section is similar to the counter electrode 2. One terminal 41 and the discharge electrode 1 are connected to the ozone erasing member 3 installed parallel to the plane created by the lead wire 12,
and the counter electrode 2 are connected by a lead wire 22, and the elevated piezoelectric m4 is grounded 43 and the ozone erasing member 3.
Terminals 33 and 34 of the electric heater 31 are taken out from the heater terminal 111, which is connected and one end is grounded 43.
It consists of 5. In FIG. 1, the counter electrode 2 is a parallel flat plate, but it may also be a flat plate electrode with a knife-shaped tip.
In this case, the loss of ff1ll is reduced. Further, the counter electrode 2 may be a wire mesh electrode.

FIG. 2 is a perspective view of the ozone erasing member 3. 35 and 35' are insulating carriers having a frame 36 and a honeycomb section 37. The heater 31 is connected to the honeycomb portion 37 of the insulating carrier 35'.
It is fixed by printing etc. 33 and 34 are terminals for connecting the heater power source 5 and the heater 31.

After fixing the heater 31, the carriers 35 and 35' are integrated by sandwiching the heater 31 from both sides (FIG. 3). At this time, the terminals 33 and 34 are connected to the carriers 35 and 35.
It is possible to connect it to the heater power source 5 by exposing it to the outside.

FIG. 3 is an enlarged cross-sectional view of 3, which is an ozone erasing member.

38 is a catalyst layer attached to the carriers 35 and 35' by impregnation or the like. Reference numeral 39 denotes an insulating layer for preventing the terminals 33 of the heater wires from being short-circuited by the conductive catalyst layer 38 made of platinum powder or the like.

Figure 4.5 shows the air purifier of the present invention as a ceiling-mounted type. FIG. 6 shows the air purifier installed inside the vehicle. The configuration and operation will be explained below with reference to FIGS. 4.5.6.

FIG. 4 is a sectional view of a ceiling-mounted air cleaner for an automobile incorporating two sets of the discharge electrode 1, counter electrode 2, and ozone erasing member 3, and FIG. 5 is a longitudinal sectional view. In Fig. 4, 13 is a discharge electrode frame, 23 is a counter electrode frame, 6 is an air-filled case made of an insulating material, and 61 is in Fig. 5.
62 is a counter electrode fixing holder for fixing the discharge electrode frame 13 to the main body case, and 62 is a counter electrode frame 23 to the main body case 6.
A discharge electrode fixing holder 63 is an ozone erasing member holder for fixing the ozone erasing member 3 to the main body case 6. 64 and 65 are side plates and a bottom plate of the main body case 6. A hole is made between the upper part of the side plate 64, that is, the position where the discharge electrode 1 is fixed, and the plate in contact with the ceiling of the main body case 6, and serves as an intake port for taking in dirty air from inside the vehicle. Also, the bottom plate 65
A hole is also made in the part corresponding to the bottom of the ozone erasing member 3 to supply clean air to Suita outlets 68A, 68B, 68C, and 68.
[). Reference numeral 66 denotes a partition plate that partitions the ion wind generating section 14 to which electrodes and the like are fixed from the high voltage power source 4 and the heater power source 5. The partition plate 66 is provided with holes or connectors for passing lead wires connecting the discharge electrode 1, counter electrode 2, and ozone erasing member 3 to the high voltage power source 4 and heater power source 5. The above-described ion wind generating units 14 are installed at symmetrical positions with the power source 4 and the heater power source 5 interposed therebetween.

−9= In FIG. 4, the high-voltage terminal 41 of the high-placed piezoelectric [4] and the discharge electrode 1 are connected by the unillustrated single-wire wire 12 for low pressure resistance, and the ground-side terminal 42 and the counter electrode are connected in the same way. 2 are connected with a lead wire 22, and a voltage of several kV to ten-odd kV is applied. As a result, an electric field is concentrated in the space 14 near the discharge electrode 1 whose shape is sharply changing, and a corona discharge occurs. Ions with both positive and negative polarities are generated by this corona discharge, but ions with the opposite polarity to the polarity of the discharge electrode 1 are absorbed by the discharge electrode 1, and only ions with the same polarity are attracted to the counter electrode 2. go. In the process of the ions being attracted to the counter electrode 2, they collide with a large number of neutral gas molecules, and by giving kinetic energy to these gas molecules and driving them, both the ions and the neutral gas molecules blow toward the counter electrode. to occur. The direction in which the wind flows at this time is shown by the arrow in FIG. Also, the flow of air throughout the air purifier is shown by the arrows in Figure 4.5. In addition, in the process of being attracted to the counter electrode 2, the ions are exposed to dust in the air, 10
- It also collides with dust, and the charged dust and dust adhere to and accumulate on the counter electrode 2 to charge the dust.

In other words, the counter electrode 2 has two effects: generating wind by attracting ions, and collecting dust by adhering dust in the air.

By the way, in the vicinity of the counter electrode 1, ozone is always generated along with the generation of ions. This is because the dissociation energy of oxygen molecules 02 dissociating into atomic oxygen O is smaller than the ionization energy of gas molecules in the air, so if an energy smaller than the ionization energy and greater than the dissociation energy is given, the oxygen molecules This is because 02 is dissociated and becomes atomic oxygen O, which oxidizes the oxygen molecule 02 to become ozone 03. If the electrode is operated only as an electrostatic precipitator, only a small amount of electricity is required and the amount of ozone generated is small, but to generate an ion wind, a large amount of electricity is required, and the amount of ozone generated is reduced accordingly. There will be more. Ozone is not only harmful to the human body, but also causes discomfort due to its characteristic odor even at temperatures as low as 111 degrees Celsius.

Therefore, the present invention decomposes the generated ozone in an air purifier, and reduces the concentration of ozone in the clean air that is discharged to the extent that it is not harmful to the human body.Generally, ozone is made of manganese dioxide, It is decomposed using platinum powder, etc. as a catalyst.However, the activity of the catalyst at room temperature is low;
It increases with increasing temperature and reaches its maximum activity at a certain humidity. Further, ozone is decomposed by heat alone. Heating the catalyst with a heater simultaneously improves the catalyst activity and promotes the natural decomposition of ozone, making it possible to decompose ozone very efficiently. In addition to the above-mentioned manganese dioxide and platinum powder, nickel oxide, (Ni 01
Ni203), palladium powder, gold powder, gold oxide,
(Au203), silver, silver oxide (Ao O, Ao
20), iron, iron oxide (Fe203), etc. The above catalyst is formed by suspending a carrier such as alumina with a built-in heater in an aqueous solution of an appropriate concentration and adding a precipitant, or by soaking the catalyst component into the carrier and adding it to the precipitant. Alternatively, it is also possible to use a vacuum device to form a thin plate of catalyst on a carrier by vapor deposition, sputtering, etc. The shape of the ozone erasing member 3 is made into a honeycomb shape, etc., and the shape of the counter electrode 2 is If installed on the downstream side of the ion wind, the emitted ozone can be reduced.The reason why the ozone eliminating member 3 is formed in a honeycomb shape is to minimize the pressure loss when the wind passes through it.This is because the ion wind This is because the wind is weak to begin with, and the wind speed decreases rapidly depending on the pressure drop of the object passing through it, so a general filter or other shape will not be able to produce the wind speed and will not be able to secure the amount of air needed as an air purifier.

When the air purifier configured as described above is fixed to the center of the ceiling of the vehicle interior with a fixing means such as a screw as shown in Fig. 6 and operated,
Due to the generation of ion wind, the air inside the vehicle is sucked in through the holes 67A and 67B at the top of the main body case 6, collected by the counter electrode 2, and after the ozone is decomposed by the ozone erasing member 3, the air is drawn into the holes 6813-A at the bottom of the case. Clean air is discharged from 68D. In addition, as shown in Fig. 4, the power supply units 4 and 5 are placed in the center, and the ion wind generation unit 14, dust collection unit, and A-syn disassembly unit, which have the same functions, are arranged on the left and right sides, so that air intake [1] Since it can be placed on the ceiling, air can be taken in evenly from either direction if it is mounted on the ceiling. Additionally, cigarette smoke and the like generally tend to accumulate near the ceiling of the passenger compartment due to rising air currents. Since the intake port of the air purifier is located near the ceiling of the vehicle interior, no matter where you smoke in the vehicle interior, you can inhale and purify the smoke with a height of 111 that accumulates near the ceiling, so that the amount of air Ml to be processed can be reduced. Therefore, the interior of the vehicle can be cleaned efficiently. In this embodiment, the power supply for generating ion wind and collecting dust is a DC 12V power supply for automobiles, and by boosting the voltage, an elevated position 11 of several kV to more than ten kV is used. This power source can be used with the same configuration as the power source for electric me used in conventional automobile air purifiers using motors and fans. Further, as the power source for the heater, a 12V DC power source can be used as is, or the temperature of the heater can be adjusted by making the power variable. Further, in this example, corona discharge was performed by applying a DC voltage, but the discharge electrode 1
It is also possible to use alternating current, pulse, or their superimposed voltage.

Similarly, the heater power source 5 can also be applied with alternating current or the like. Further, in this embodiment, instead of embedding the heater 31 inside the carrier, it is also possible to attach the heater 31 on the surface of a honeycomb shape or the like. Further, in the present embodiment, the ozone eliminating member 3 is integrated with the catalyst and the heater 31, but since ozone is decomposed by heat alone, it is also possible to use only the heater 31 as the ozone eliminating member 3.

Figure 7.8 shows a second embodiment of the invention. Instead of fixing the heater to the carrier in the first embodiment, P is used as the material of the carrier.
It is designed to use TC.

FIG. 7 is a sectional view of the ozone erasing member 3, and FIG. 8 is a side view. In Fig. 7, 71 is a PTC heater, 72
G, a conductive plate 76 for fixing the tPTC heater 71 and connecting the PTCt:-ta electrode 73 and the lead wire 15;
By using the PTC heater 71 in the impregnated layer and the carrier, the carrier has a uniform temperature distribution, so the activity of the catalyst 74 does not vary, and the PTC heater 71 itself controls the temperature. The advantage of using a single material is that there is no need to adjust the temperature. Also heater 1
~ Since the carrier is integrated, only the work of impregnating the catalyst 14 is required, which is advantageous from the viewpoint of manufacturing.

9.10.11 shows a third embodiment of the present invention.

Instead of embedding the heater in the center of one carrier in the first embodiment, the carrier is made up of a plurality of plates and is embedded therein. FIG. 9 is a perspective view of the entire ozone erasing member,
FIG. 10 is a structural diagram of one ozone erasing member, and FIG. 11 is a sectional view thereof.

In FIG. 9, 8 indicates one ozone erasing member 181, which is a frame for fixing the ozone erasing member 8;
2 is an embedded heater wire, 83 is a terminal of the heater wire 82, 5 is a heater power source, in FIG. 11, 84 is a carrier, 85
is an impregnated layer of catalyst 86. By arranging the heater wires 82 almost uniformly inside one sheet of ozone erasing member 8, a uniform temperature distribution is achieved as in the second embodiment. Furthermore, since the single ozone erasing member 8 is a flat surface, vapor deposition and sputtering methods can be easily applied in addition to impregnation as a method for attaching the contact 186. Furthermore, by using a plurality of plates, it becomes possible to partially replace the parts in case of failure.

FIG. 12 shows a fourth embodiment of the present invention.

Instead of providing a separate counter electrode 2, a counter electrode 2' is provided on the windward surface of the ozone erasing member 3 between it and the discharge electrode 1.
By applying a voltage, generation of ion wind, dust collection, and ozone decomposition can be performed simultaneously in the ozone erasing member 3, and the number of parts can be reduced and the device can be made compact.

As described above, the air purifier of the present invention can decompose ozone generated in the ion wind generating section at high temperature by attaching the heater to the outlet side from the counter electrode. ozone concentration can be reduced. In addition, in an air purifier equipped with an ozone decomposition catalyst, the catalyst can be heated by a heater, so it has the excellent effect of efficiently decomposing the ozone through highly active catalytic action and spontaneous decomposition due to heat. Since it is formed into a rough honeycomb shape, there is little decrease in ion wind speed due to pressure loss.

Although the present invention has been described as an air purifier for automobiles, it goes without saying that the present invention is applicable not only to automobiles but also to places where air purification is required, such as household air purifiers.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the air purifier of the present invention, and FIG. 2 is a schematic diagram showing a first embodiment of the air purifier of the present invention.
FIG. 3 is an enlarged cross-sectional view of the ozone eliminating member of the first embodiment of the air purifier of the present invention, and FIG. 4.5.6 shows the ozone eliminating member of the first embodiment for use in automobiles. Fig. 7.8 is a sectional view of the ozone eliminating member of the second embodiment of the air purifier of the present invention, Fig. 9.10
, 11 is a cross-sectional view of an ozone-eliminating member according to a third embodiment that is attached to an air purifier of the present invention, and FIG. 12 is a cross-sectional view of an ozone-eliminating member according to a fourth embodiment that is attached to an air purifier of the present invention. It is a diagram. In the figure 1...discharge electrode 2...counter electrode 3...
Ozone erasing member 4... Highly placed piezoelectric I? i5... Power supply for heater 12.22... Lead wire 33.34...
・Heater terminal 19-0 Inventor: Nobuyoshi Sakakibara, Iwatani I, Shimohakaku-cho, Nishio City
RQ- 14 Nippon Auto Parts Co., Ltd. No. 1 Inside Nippondenso Co., Ltd.

Claims (1)

[Claims] 1) A case having an inlet and an outlet; a discharge electrode provided on the inlet side in the case; a counter electrode that induces the ions and collects dust in the air carried by the ion wind; a voltage power supply that generates a potential difference between the discharge electrode and the counter electrode; , and an ozone eliminating member equipped with at least a heater. 2) The air purifier according to claim 1, wherein the discharge electrode is composed of a large number of needle-like electrodes. 3) The air purifier according to claim 1 or 2, wherein the counter electrode is configured in the shape of a wire mesh. 4) The sacrificial cleaner according to claim 1 or 2, wherein the counter electrode is composed of a plurality of flat plate electrodes each having a knife-like tip facing the needle electrode. 5) The ozone erasing member includes a plurality of plate-shaped insulators arranged in parallel at predetermined intervals, an electric heater fitted inside the insulators, and an ozone adsorbent attached to the surface of the insulators. The air cleaner according to any one of claims 1, 2, 3, and 4, characterized in that the air cleaner comprises an ozone decomposing agent or an ozone decomposing agent. 6) The air purifier according to any one of claims 1, 2, 3, and 4, wherein the ozone erasing member has a heater mounted on the surface of an insulator. . 7) The ozone erasing member is made of conductive ceramic or metal having a large positive temperature resistance coefficient, and includes a heater body formed in a honeycomb shape or a matrix shape, and an ozone adsorbent attached to the surface of the heater body. The air cleaner according to any one of claims 1, 2, 3, and 4, characterized in that the air cleaner comprises an ozone decomposing agent. 8) The counter electrode is formed by adhering a conductive material to a surface of the ozone erasing member that faces the discharge electrode. The air purifier according to any one of Items 1 and 7. 9) The counter electrode is disposed on the surface of the ozone erasing member and is integrally configured, according to any one of claims 1, 5, 6, and 7. air purifier.