JPH09248489A - Air cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify constitution by reducing the number of the wirings to electrodes without lowering dust collection capacity to achieve the facilitation of assembling, cost reduction and the facilitation of cleaning-and maintenance. SOLUTION: Corona discharge is generated between a discharge electrode 1 and a dust collection electrode 2 and dust charged in the ion wind caused by the corona discharge to become charged particles is collected by the dust collection electrode 2. The electrons generated by corona discharge move not only to the dust collection electrode 2 but also to auxiliary electrodes 3 placed in an electrical flow state. Negative induction charge is generated in the auxiliary electrodes 3 by the action of the electric field generated by corona discharge. Since the negative induction charge is hard to escape because the auxiliary electrodes 3 are held by dielectrics 5 large in surface resistance, electrons are accumulated in the auxiliary electrodes 3, 3 and, as a result, the potential of the auxiliary electrodes 3, 3 becomes the intermediate potential of the discharge electrode 1 and the dust collection electrode 2 and is held as it is. By this constitution, equal electric fields are formed between the auxiliary electrodes 3 and the dust collection electrode 2 and act so as to move dust particles charged to become charged particles from the auxiliary electrodes 3 to the dust collection electrode 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a corona discharge generated between a discharge electrode and a discharge counter electrode (meaning an electrode arranged so as to face the discharge electrode) to generate a corona discharge in the air in the induced ion wind. The present invention relates to an improvement in an air cleaning device that collects dust by charging it into charged particles.

[0002]

2. Description of the Related Art Conventionally, in this type of air cleaning device,
Each of the discharge counter electrodes has a plurality of dust-collecting electrodes that electrically collect dust that has become charged particles due to ionic wind, and auxiliary electrodes that expand the discharge area to improve dust-collecting performance. There is known a device having a configuration in which predetermined potentials are set for the discharge electrodes (see Japanese Patent Publication No. 6-36875).

[0003]

By the way, in the above-mentioned device, when the dust that has become the charged particles adheres to the dust collecting electrode or the auxiliary electrode, this causes a decrease in air blowing performance or abnormal discharge. Therefore, in the above apparatus, it is necessary to clean the dust adhering to the dust collecting electrode and the auxiliary electrode, so that both electrodes can be integrated and removed.

However, even though both electrodes can be removed integrally, wiring is provided to all electrodes to set each electrode to a predetermined potential, so the electrode structure is rather complicated. is there. Moreover, in order to use the device in a good condition, it is required to regularly clean the dust collecting electrode and the auxiliary electrode. Therefore, it is preferable that the number of wirings on the discharge counter electrode side is as small as possible for easy removal. .

Therefore, an object of the present invention is to reduce the number of wirings to the electrodes and to simplify the structure without deteriorating the dust collection performance.
Therefore, it is an object of the present invention to provide an air cleaning device that can facilitate assembly, reduce costs, and facilitate cleaning and maintenance.

[0006]

According to a first aspect of the present invention, there is provided an air purifying device, which includes a discharge electrode for generating a corona discharge and a dust collecting member for collecting dust particles charged due to the corona discharge. It has a pole and an auxiliary pole for expanding the area of the corona discharge. The discharge electrode and the dust collecting electrode are arranged on the same surface, and a voltage sufficient to generate corona discharge is applied between both electrodes. And for the auxiliary pole,
It is electrically floated.

According to the first aspect of the present invention, corona discharge occurs between the discharge electrode and the dust collecting electrode, but the electrons resulting from the corona discharge are not only applied to the dust collecting electrode but also to the auxiliary electrode. Moving. As a result, electrons are accumulated in the auxiliary electrode, and the potential of the auxiliary electrode becomes an intermediate potential between the discharge electrode and the dust collecting electrode. Since the auxiliary electrode is electrically floated, the intermediate potential is maintained as it is.

The intermediate electric potential held by the auxiliary electrode forms a uniform electric field between the auxiliary electrode and the dust collecting electrode, and this uniform electric field collects dust particles charged due to the corona discharge. It will act to move to the dust pole side.

In a preferred embodiment according to the first aspect of the present invention, the auxiliary electrode is located farther from the discharge electrode than the dust collecting electrode.

As a result, in the flow of ionic wind from the discharge electrode toward the dust collecting electrode and the auxiliary electrode, the charged dust particles are charged as charged particles before reaching the distant auxiliary electrode. The electric field between them attracts the dust collecting electrode. As a result, the number of charged particles collected on the auxiliary electrode is reduced, the auxiliary electrode is less likely to be contaminated, and the necessity for cleaning the auxiliary electrode is reduced. Therefore, it is usually necessary to remove only the dust collecting electrode and clean it, which facilitates cleaning.

In another preferred embodiment different from the above, since the needle-shaped electrode is used as the discharge electrode, the electric field strength becomes particularly strong at the tip end portion thereof, and the discharge electrode and the dust collecting electrode are connected to each other. The electric field distribution becomes nearly uniform in the direction along the edge of the dust collecting electrode. That is, the lines of electric force spread uniformly in the direction along the edge of the dust collecting electrode. As a result, a strong electric field uniformly distributed over the discharge electrode and the dust collecting electrode is obtained, and high dust collecting performance is obtained.

Therefore, compared with the conventional device using the plate-shaped dust collecting electrode, it is possible to obtain the same dust collecting ability as that of the conventional device with a smaller number of dust collecting electrodes. Moreover, since there are few dust collecting electrodes, cleaning can be performed easily.

Conventionally, there is also known a device in which a needle electrode is used as a discharge electrode and a cylindrical electrode is used as a dust collecting electrode, and both are combined, and this device has a high collecting efficiency based on the same principle as that of the device according to the present invention. Demonstrate dust performance. However, when comparing this device with the device according to the present invention, the device according to the present invention is a device using the conventional cylindrical electrode as a dust collecting electrode because the dust collecting electrode is a plate-like electrode having a simple structure. Compared with, there is an advantage that cleaning can be performed easily.

In a further preferred embodiment different from the above, a plurality of needle-like electrodes are arranged as discharge electrodes in a direction along the edge of the dust collecting electrode, and the edge of the dust collecting electrode on the discharge electrode side is arranged. The structure is curved in a wave shape so that the distance from each needle electrode is uniform.

By providing a plurality of discharge electrodes in this way, the dust collecting capability is further improved. Even in this case, since the dust collecting electrode needs only one plate-shaped electrode, the structure is simple and therefore the cleaning can be easily performed. In particular, in comparison with a conventional device having a cylindrical electrode as a dust collecting electrode, in this conventional device, it is necessary to arrange the cylindrical electrodes as dust collecting electrodes by the number of needle electrodes. The simplicity of the configuration of the device is remarkable.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an electrode structure provided in the air cleaning device according to the first embodiment of the present invention.

As shown in the figure, the above-mentioned apparatus includes a discharge electrode 1 for generating a corona discharge, and a dust collecting electrode 2 for collecting dust particles charged by the ionic wind resulting from the corona discharge to become charged particles. , An electrode structure having a pair of auxiliary electrodes 3 and 3 for expanding a region of corona discharge generated between the electrodes 1 and 2 and dielectrics 5 and 5 for holding them.

In this embodiment, a needle electrode is used for the discharge electrode 1 and a plate electrode is used for the dust collecting electrode 2, and the discharge electrode 1 and the dust collecting electrode 2 are as shown in the figure. , Are arranged to face each other with a predetermined gap on the same surface. In the present embodiment, the discharge electrode 1 has, for example, −5 KV to −15.
A negative DC voltage of about KV is applied from the DC power supply 4, while the dust collecting electrode 2 is grounded.

Therefore, the distance between the discharge electrode 1 and the dust collecting electrode 2 is 5
There is a potential difference of KV to 15 KV, which means that a sufficient voltage is applied between the electrodes 1 and 2 to cause corona discharge.

The dust collecting electrode 2 has an edge 2 on the discharge electrode side.
The shape seen from the front side (or the back side) in FIG.
It is formed to have an arc shape, which prevents the discharge from the tip portion of the discharge electrode 1 from being concentrated.

In the present embodiment, a pair of auxiliary electrodes 3 and 3 are plate electrodes having substantially the same shape as the dust collecting electrode 2.
The auxiliary electrodes 3 and 3 are equidistant from the upper surface and the lower surface of the dust collecting electrode 2, and the edge 3a on the discharge electrode side of the auxiliary electrode 3 is closer to the edge 2a of the dust collecting electrode 2 on the discharge electrode side. The auxiliary electrodes 3, 3 are held closer to the discharge electrode 1 by dielectrics 5, 5 on a plate larger than each auxiliary electrode 3, 3. That is, unlike the discharge electrode 1 and the dust collecting electrode 2, the auxiliary electrodes 3 and 3 are electrically placed in a floating state.

To summarize the above contents, in the electrode structure according to the present embodiment, the dust collecting electrode 2 is arranged along the discharge direction of the discharge electrode 1, and the discharge electrode 1 and the dust collecting electrode 2 are centered. As a result, a pair of auxiliary poles 3 and 3 are arranged equidistant from both electrodes 1 and 2 and held by dielectrics 5 and 5, respectively, facing each other.

In the air purifying apparatus having the electrode structure constructed as described above, the discharge electrode 1 and the dust collecting electrode 2 are driven during the driving.
A corona discharge is generated between the two, and the dust that has become charged particles in the ionic wind due to this corona discharge becomes dust collecting electrode 2
Collected at.

Here, the electrons generated by the corona discharge move not only to the dust collecting electrode 2 but also to the auxiliary electrode 3. Also,
Due to the action of the electric field generated by the corona discharge, negative induced charges (that is, electrons) are generated in the auxiliary electrodes 3 and 3. These induced charges are hard to escape because the auxiliary electrodes 3 and 3 are held by the dielectric 5 having a large surface resistance. Therefore, negative charges (that is, electrons) are accumulated in the auxiliary electrodes 3 and 3, and as a result, the potential of the auxiliary electrodes 3 and 3 becomes an intermediate potential between the discharge electrode 1 and the dust collecting electrode 2, and the potential remains as it is. Will be retained.

In this way, the potentials of the auxiliary electrodes 3 and 3 become an intermediate potential between the discharge electrode 1 and the dust collecting electrode 2, so that a uniform electric field is formed between the auxiliary electrode 3 and the dust collecting electrode 2. To be done. This uniform electric field acts to move the dust particles, which are charged and become charged particles, from the auxiliary electrode 3 side to the dust collecting electrode 2 side. Therefore, there is an advantage that the dust collecting performance is improved and the auxiliary electrode 3 is less likely to be contaminated. In addition, between the discharge electrode 1 and the dust collecting electrode 2,
For example, a positive DC voltage of about 5 KV to 15 KV may be applied.

FIG. 2 shows an electrode structure provided in the air cleaning device according to the second embodiment of the present invention.

In the device according to this embodiment, a plurality of discharge electrodes 1 and dust collecting electrodes 2 are arranged, and accordingly, a plurality of auxiliary electrodes 3 are also opposed to each other with the discharge electrodes 1 and dust collecting electrodes 2 interposed therebetween. It is arranged. Of the respective auxiliary poles 3, the auxiliary poles 3 and 3 located at the upper and lower ends of FIG. 2 are held by the dielectrics 5 and 5, respectively, as is apparent from the figure. Although not shown, the pole 3 is also held by a dielectric similar to the above dielectrics 5 and 5. In the device according to the present embodiment, each discharge electrode 1
, A positive DC voltage of, for example, about 5 KV to 15 KV is applied from the DC power supply 4 ', while each dust collecting electrode 2 is grounded.

Therefore, a potential difference of 5 KV to 15 KV is generated between each discharge electrode 1 and each dust collection electrode 2, and this causes a voltage sufficient to generate corona discharge between both electrodes 1 and 2. Is being applied.

The device according to this embodiment can also achieve the same effects as in the above-described first embodiment. In addition, between each discharge electrode 1 and each dust collecting electrode 2, for example, −5 KV
It does not matter if a negative DC voltage of about -15 KV is applied.

FIG. 3 shows an electrode structure provided in the air cleaning device according to the third embodiment of the present invention.

The apparatus according to this embodiment is positioned as a modification of the apparatus according to the first embodiment shown in FIG.

In the device according to the first embodiment of the present invention,
While the auxiliary electrodes 3 and 3 are arranged closer to the discharge electrode 1 than the dust collecting electrode 2, in the device according to the present embodiment, conversely, the auxiliary electrodes 3 and 3 are arranged farther from the dust collecting electrode 2. Is also arranged at a position far from the discharge electrode 1. At other points, that is, to the discharge electrode 1, for example, a negative DC voltage of about −5 KV to −15 KV is applied from the DC power source 4, the dust collecting electrode 2 is grounded, and the auxiliary electrodes 3 and 3 are provided. It is similar to the device according to the first embodiment in that it is held by the dielectrics 5 and 5, respectively.

With the above electrode structure, the discharge electrode 1
Dust particles that are charged into charged particles in the flow of the ionic wind heading toward the dust collecting electrode 2 and the auxiliary electrode 3 from the dust collecting electrode 2 to the auxiliary electrode 3 before reaching the distant auxiliary electrode 3. The electric field generated between the electrode 2 and the pole 2 causes the dust to be drawn toward the dust collecting electrode 2, and as a result, the number of charged particles collected by the auxiliary electrode 3 is reduced and the auxiliary electrode 3 is less likely to be contaminated. is there.

FIG. 4 is a side view showing a modified example of the plate electrode used as the dust collecting electrode 2 in the apparatus according to each of the above-mentioned embodiments, and FIG. 5 is a front view thereof.

In this modification, as shown in FIG. 5, a needle electrode is used as the discharge electrode 1, and the needle electrodes are arranged in a line in the direction along the edge of the dust collecting electrode 2. Has been done. On the other hand, the dust collecting electrode 2 has a curved portion 2 corresponding to each of the discharge electrodes 1.
a. The curvature of the curved portion 2a corresponds to a locus when a circle is drawn around the corresponding discharge electrode 1. Therefore, the edge of the dust collecting electrode 2 facing the discharge electrode 1 is
As a whole, as shown in FIG. 5, it is formed in a wave shape.

By configuring the dust collecting electrode 2 as described above, a strong electric field uniformly distributed over the whole is obtained, and high dust collecting performance is obtained.

It should be noted that the above-mentioned contents are only related to the respective embodiments of the present invention, and it is needless to say that the present invention is not limited to the above-mentioned contents.

[0039]

As described above, according to the present invention,
To provide an air purifying device capable of reducing the number of wirings to electrodes and simplifying the configuration without lowering the dust collecting performance, thereby facilitating assembly, cost reduction, and cleaning and maintenance. You can

[Brief description of drawings]

FIG. 1 is a diagram showing an electrode structure of an air cleaning device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an electrode structure of an air cleaning device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing an electrode structure of an air cleaning device according to a third embodiment of the present invention.

FIG. 4 is a side view showing a modified example of a plate electrode used as a dust collecting electrode in the apparatus of each embodiment.

FIG. 5 is a front view showing a modified example of a plate electrode used as a dust collecting electrode in the device of each embodiment.

[Explanation of symbols]

 1 Discharge electrode 2 Dust collecting electrode 3 Auxiliary electrode 4, 4'DC power supply 5 Dielectric

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Toyota, 1-1 Nakajima, 2-chome, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Kikai Co., Ltd. (72) Inventor Kiyoshi Fujino 2 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka 1st-1st Totoki Equipment Co., Ltd.

Claims (4)

[Claims] 1. A discharge electrode for generating a corona discharge, a dust collecting electrode for collecting dust particles charged due to the corona discharge, and an auxiliary electrode for expanding a region of the corona discharge. The discharge electrode and the dust collecting electrode are arranged on the same surface, and a voltage sufficient to generate a corona discharge is applied between the discharge electrode and the dust collecting electrode. The air cleaning device, wherein the auxiliary electrode is placed in an electrically floating state. 2. The air cleaning apparatus according to claim 1, wherein the auxiliary electrode is located farther from the discharge electrode than the dust collecting electrode. 3. The air cleaning apparatus according to claim 1, wherein the discharge electrode is a needle-shaped electrode, and the dust collecting electrode is a plate-shaped electrode as a whole, and an edge on the discharge electrode side thereof. Is curved so that the distance from the discharge electrode is uniform. 4. The air cleaning apparatus according to claim 3, wherein a plurality of needle-shaped electrodes are arranged in a direction along an edge of the dust collecting electrode, and the edge of the dust collecting electrode on the discharge electrode side is the An air purification device, which is curved in a wave shape so that the distance from each needle electrode is uniform.