JPH09308837A - Air purifier - Google Patents

Abstract

(57) Abstract: In an electronic air cleaning device, the uniformity of dust adsorption is enhanced and the efficiency of dust adsorption is enhanced. SOLUTION: First and second outer peripheral surfaces of a cylindrical support 4 are provided.
The dust collecting electrodes 21 and 22 are arranged. Second dust collecting electrode 22
A small hole 24 is provided in the. The area of the second dust collecting electrode 22 that is farther away from the ionization electrode 1 than the first dust collecting electrode 21 is made larger than the area of the first dust collecting electrode 21. First
The total surface area of the second dust collecting electrodes 21 and 22 is about 70% or more of the area of the wound portion of the dust collecting paper 6 with respect to the support 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifying apparatus of the type in which dust is ionized and collected.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 2, a conventional air cleaning apparatus includes an ionization electrode (cathode) 1 to which, for example, -6 kV is applied, and a first dust collection electrode 2 having, for example, a ground potential.
And a second dust collecting electrode 3 to which, for example, 6 kV is applied. The ionization electrode 1 is formed in a cylindrical shape and has a large number of needle-like protrusions 1a. The first and second dust collecting electrodes 2 and 3 are band-shaped metal plates, and are wound around the surface of a cylindrical insulating support 4 having a smaller diameter than the cylinder of the ionization electrode 1. . The first dust collecting electrode 2 is arranged at a position close to the ionization electrode 1, and the second dust collecting electrode 3 is arranged at a position farther from the ionization electrode 1 than the first dust collection electrode 2.

A hollow portion 5 of a cylindrical support 4 accommodates a roll of dust-collecting paper 6 as an insulating and flexible dust-collecting sheet. In addition, a shaft 7 for rotatably positioning the roll-shaped dust-collecting paper 6 is provided, and the dust-collecting paper 6 is placed on the wall of the cylindrical support 4 in the hollow portion 5.
A groove 8 is provided for drawing out from the groove. The dust collecting paper 6 is drawn out of the groove 8 and wound around the entire outer peripheral surface of the cylindrical support 4 so as to cover the first and second dust collecting electrodes 2 and 3.
It is fixed to the cylindrical support 4 by a fixing member (not shown). The ionization electrode 1 is fixed to a trapezoidal insulating support 9. The trapezoidal support 9 is provided with a number of columns 10 for positioning a cover (not shown) having a number of slits serving as air passages. In addition, the trapezoidal support 9 supports the cylindrical support 4.

The ionization electrode 1, the first and second dust collection electrodes 2, 3 are connected to a power supply circuit shown in FIG. This power supply circuit is a ringing choke converter, for example, a DC power supply 11 composed of a rectifying and smoothing circuit connected to a commercial AC power supply, and a transformer 12 connected between a pair of output terminals of the DC power supply 11. A secondary winding 13, a transistor 14 as a switching element connected in series to the primary winding 13, and a secondary winding 1 of the transformer 12.
5 comprises a multiplying voltage rectifier circuit 16, a tertiary winding 17 of the transformer 12, and a control circuit 26. The multiplying voltage rectifier circuit 16 includes six diodes D1 to D6, six capacitors C1 to C6, and five resistors R1 to R5. The output line 18 of the resistor R3 is connected to the second dust collecting electrode 3, and the output line 19 of the resistor R4 is connected to the first dust collecting electrode 2.
The output line 20 of the resistor R5 is connected to the ionization electrode 1.

[0005] The control circuit 26 controls the base current of the transistor 14 to obtain a constant output voltage based on the voltage of the tertiary winding 17. Transistor 14 turns on and off as in a well-known ringing choke converter.

When, for example, -6 kV is applied to the ionization electrode 1, 0 V is applied to the first dust collection electrode 2, and +6 kV is applied to the second dust collection electrode 3, the ionization electrode 1 serving as a cathode and the first and second dust collection electrodes are applied. Corona discharge occurs between the electrodes 2 and 3, and a large amount of electrons jumps out of the ionization electrode 1 toward the first and second dust collection electrodes 2 and 3. The electrons ejected by this corona discharge negatively ionize air molecules (particularly oxygen molecules). Dust floating in the air (for example, dust, bacteria, virus, house dust mites, pollen, etc.) receives electrons from negative ions and becomes negatively charged particles, that is, negatively ionized dust. Since the first and second collection electrodes 2 and 3 have a high potential with respect to the ionization electrode 1, the first and second collection electrodes 2 and 3 are in a positively charged state. A Coulomb force acts between them, and the negative ionized dust moves toward the dust collecting electrodes 2 and 3 and is adsorbed on the dust collecting paper 6 wound around the outer peripheral surface of the cylindrical support 4. It should be noted that a unipolar ion moves under a DC electric field in a specific direction, that is, an ion wind is generated.
Therefore, in the apparatus shown in FIGS. 1 and 2, ion wind is generated from the ionization electrode 1 toward the first and second dust collection electrodes 2 and 3. That is, ion wind is generated from the lower side of the cylindrical support 4 to the upper side. The first dust collection electrode 2 disposed between the ionization electrode 1 and the second dust collection electrode 3 also has a function of making the potential distribution uniform and a function of favorably generating ion wind.

[0007]

In order for the dust collecting paper 6 to adsorb dust efficiently and stably, it is desirable that the humidity of the atmosphere surrounding the dust collecting paper 6 is 30% or more and as high as possible. Therefore, when the humidity is low, the dust adsorption performance of the dust collecting paper 6 may be deteriorated and the adsorbed dust may be peeled off. Further, in the conventional air purifying device, the dust moving by the ion wind is configured to be adsorbed to the dust collecting paper 6 having a humidity of a certain level or more, so that the first and second dust collecting electrodes 2, The area of 3 is much smaller than the winding area of the dust collecting paper 6 around the cylindrical support 4. Dust is also adsorbed to the area of the dust collecting paper 6 which is not in contact with the dust collecting electrodes 2 and 3 by the adsorption action based on the humidity.
It is less than the area in contact with 3. Therefore, the distribution of dust adsorption on the dust collecting paper 6 becomes non-uniform.

Therefore, an object of the present invention is to provide an air cleaning device which can improve the dust adsorption efficiency.

[0009]

The present invention for achieving the above object comprises an ionizing electrode, a dust collecting electrode, a support for the ionizing electrode and the dust collecting electrode, and a surface for contacting the dust collecting electrode. In the air cleaning device having the structure for arranging the dust collecting sheet to adsorb dust on the dust collecting sheet, the dust collecting electrode is a conductor plate having a large number of small holes or irregularities. The present invention relates to an air cleaning device. As described in claim 2, the dust collecting electrode is at least the first and second dust collecting electrodes 2 and 3, and the second dust collecting electrode arranged farther than the ionizing electrode has a large number of small holes or irregularities. Can be provided. Further, as described in claim 3, small holes or irregularities can be provided in both the first and second dust collecting electrodes. Further, as described in claim 4, the surface area of the dust collecting electrode is collected regardless of the presence or absence of small holes or irregularities in the dust collecting electrode and the presence or absence of the first and second dust collecting electrodes 2 and 3. 30% or more of the area of the dust sheet, preferably 5
It is desired to be 0% or more, more preferably 70% or more. Further, as described in claim 5, it is desirable that the surface area of the second dust collecting electrode be larger than the surface area of the first dust collecting electrode.

[0010]

According to the inventions of claims 1 to 3,
It is possible to create irregularities on the surface of the dust collecting sheet corresponding to the small holes or irregularities of the dust collecting electrode. Therefore, the surface area of the dust collecting sheet is increased, and the dust adsorption efficiency can be increased. Further, the dust adsorbed in the concave portion of the dust collecting sheet is less likely to be peeled off, and the dust once adsorbed is less likely to fly out into the atmosphere. In addition, when the dust collecting electrode is provided with a small hole, the dust collecting electrode is increased in flexibility and the workability for forming the dust collecting electrode into a desired shape is improved. According to the inventions of claims 4 and 5, by increasing the area of the dust collecting electrode, the range of the electric field for adsorbing dust by the Coulomb force can be increased as compared with the conventional case, and the dust adsorption efficiency can be increased. Can be increased. That is, in the conventional air purifying device, since the dust is adsorbed only on the humidity and the ionic wind in the area which is not in contact with the dust collecting electrode of the dust collecting sheet and is apart from the ionizing electrode, the adsorption efficiency is improved. However, if the area of the dust collecting electrode is increased as in the inventions of claims 4 and 5, the area that can be adsorbed by the Coulomb force is increased, and the dust is adsorbed even when the humidity is low. Efficiency is improved. Further, the adsorption of dust to the dust collecting sheet can be made uniform, and the usage period of the same dust collecting paper can be extended. In addition, as in the invention of claim 5, the first
In the case of having the second dust collecting electrode, the uniformity of the adsorption of dust is improved by increasing the area of the second dust collecting electrode far from the ionization electrode.

[0011]

[First Embodiment] Next, an electronic air cleaning apparatus according to a first embodiment of the present invention will be described with reference to FIGS. However,
3 to 5, parts that are substantially the same as those in FIGS. 1 and 2 are given the same reference numerals, and explanations thereof are omitted.

The electronic air purifying apparatus shown in FIGS.
1 and 2 except that the shape of the second dust collecting electrode 3 is changed. Second dust collecting electrode 22 of the air cleaning device shown in FIGS. 3 and 4.
Has a diameter of 0.5 to 5 mm and an area of 0.39 to 39.25 m
It has a large number of small holes 24 of about m ² . Further, as is clear from the comparison between the conventional second dust collecting electrode 3 shown in FIG. 1 and the second dust collecting electrode 22 according to the present invention shown in FIG. 3, the surface area of the second dust collecting electrode 22 shown in FIG. It is larger than the surface area of the second dust collecting electrode 3 in FIG. The total value of the surface areas of the first and second dust collecting electrodes 21 and 22 in the air cleaning apparatus of FIGS. 3 and 4 is about 70% of the area of the dust collecting paper 6 wound around the cylindrical support 4. The first dust collecting electrode 21 is formed by winding a metal flat plate such as titanium having no many small holes around the cylindrical support 4.

The second dust collecting electrode 22 has a thickness of 0.3-0.
A flexible metal plate having a size of about 5 mm, which has a small hole 24 formed therein by punching, is wound around and fixed to the outer peripheral surface of the cylindrical support 4. The second dust collecting electrode 22 has relatively large flexibility due to the small holes 24, and can be easily wound around the cylindrical support body 4.

The basic structure of the power supply circuit for the ionization electrode 1, the first and second dust collecting electrodes 21, 22 is the same as that of the conventional power supply circuit shown in FIG.
V, 0 kV for the first dust collecting electrode 21, second dust collecting electrode 22
+6 kV is applied to. The first dust collecting electrode 21 has the same function as that of the first dust collecting electrode 2 in FIGS. 1 and 2.

The flexible dust collecting paper 6 such as a paper towel is wound around the cylindrical support 4 in the same manner as in the conventional case shown in FIG. The second dust collecting electrode 22 has a small hole 24.
Therefore, when the dust collecting paper 6 is wound around the second dust collecting electrode 22 and used, a state in which a part of the dust collecting paper 6 has entered the small holes 24 and the dust collecting paper 6 is In addition to the essential irregularities that it has, irregularities corresponding to the small holes 24 occur on the surface. Coulomb force is 1 m from the first and second dust collecting electrodes 21, 22.
Since it effectively acts on ionized dust at a distance of up to about m, when the thickness of the dust collecting paper 6 is 1 mm or less, the dust collecting paper 6 comes into contact with the first and second dust collecting electrodes 21 and 22. The Coulomb force acts on the ionized dust in the region located in the small hole 24 as well as in the region in which the Coulomb force is present. Therefore, the small holes 24 of the dust collecting paper 6 also contribute to dust collection by the Coulomb force. When the humidity is 30% or more, the area of the dust collecting paper 6 that is not in contact with the dust collecting electrodes 21 and 22 functions as a suction surface for the dust moving by the ion wind. Therefore, when the small hole 24 is relatively large, the small hole 2 of the dust collecting paper 6
An area near the periphery of 4 has both an adsorption surface by Coulomb force and an adsorption surface for dust moving by ionic wind, and a central area has a function as an adsorption surface for dust moving by ionic wind.

As is apparent from the above, in the air cleaning apparatus of this embodiment, the small holes 24 increase the surface area of the dust collecting paper 6, and the dust adsorbed in the area of the small holes 24 of the dust collecting paper 6. Is less likely to occur, and the dust collection efficiency can be improved. Further, since the total area of the dust collecting electrodes 21 and 22 is increased, the adsorption area of the dust collecting paper 6 due to the Coulomb force is increased, and the adsorption distribution of dust is made uniform especially when the humidity is low. Therefore, it is possible to extend the use period of the dust collecting paper 6. Further, since the surface area of the second dust collecting electrode 22 is larger than that of the first dust collecting electrode 21, the dust collecting action by the Coulomb force of the second dust collecting electrode 22 far from the ionization electrode 1 is increased. However, the uniformity of the dust adsorption distribution is improved.

[0017]

[Second Embodiment] Next, an electronic air cleaning apparatus according to a second embodiment will be described with reference to FIGS. 6 and 7. However, in FIGS. 6 and 7, substantially the same parts as those in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted. The air cleaning apparatus shown in FIGS. 6 and 7 is shown in FIGS. 3 and 4 in the shapes of the ionization electrode 1, the first and second dust collecting electrodes 21 and 22, the support 4 for these, and the ionization electrode support 9. Different from the one. However, the functions of the respective parts shown in FIGS. 6 and 7 are substantially the same as those shown by the same reference numerals in FIGS. 3 and 4. In FIG. 6 and FIG. 7, the ionization electrode 1 is composed of two linear conductors, and the first and second dust collecting electrodes 21 and 22.
Is a strip-shaped metal plate extending linearly, and is an insulating support 4
Are formed to have an arcuate surface. The pair of linear ionization electrodes 1 are a pair of plate-shaped supports 9 facing each other.
Supported by. One of the two first dust collecting electrodes 21 is disposed on one inclined surface of the support 4 and
The other of the dust collecting electrodes 21 is disposed on the other inclined surface of the support 4. One of the two second dust collecting electrodes 22 is disposed on one inclined surface of the support 4 and
The other of the dust collecting electrodes 22 is disposed on the other inclined surface of the support 4. The second dust collecting electrode 22 has a small hole 24 as in the first embodiment. In addition, −6 kV is applied to the ionization electrode 1 of FIGS. 6 and 7, 0 kV is applied to the first dust collecting electrode 21, and +6 V is applied to the second dust collecting electrode 22.
The total surface area of the first and second dust collecting electrodes 21 and 22 is set to be about 50% or more of the area of the region of the dust collecting paper 6 arranged on the arcuate surface of the support 4. In addition, small hole 2
4 is formed under the same conditions as in the first embodiment.

Since the air cleaning device shown in FIGS. 6 and 7 is the same in operation principle as that shown in FIGS. 3 and 4, it has substantially the same function and effect as those shown in FIGS. . Further, since the first and second dust collecting electrodes 21 and 22 are arranged on the arcuate surface, it becomes possible to adsorb ionized dust in a state of being confined in the arcuate shape, and the dust collecting efficiency is improved. Becomes higher.

[0019]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) The second dust collecting electrode 22 can be divided into two or more pieces. Further, the first dust collecting electrode 21 can be divided into a plurality of parts. (2) The first dust collecting electrode 21 can be omitted. (3) Like the second dust collecting electrode 22, the first dust collecting electrode 21 may have a small hole. In this case, it is desirable that the small holes in the first dust collecting electrode 21 be uniformly distributed with respect to the ionization electrode 1. (4) Instead of the small holes 24, irregularities having a height (depth) of preferably 0.2 to 2 mm can be provided on the surface of the second dust collecting electrode 22. (5) It is possible to add a function of providing a fan to remove dust in the air with a filter. (6) The ratio of the total surface area of the first and second dust collecting electrodes 21, 22 to the portion of the dust collecting paper 6 on the outer peripheral surface of the support 4 can be changed. In order to make the adsorption of dust on the dust collecting paper 6 uniform, the above ratio is set to 30% or more, preferably 50% or more, and more preferably 70% or more. (7) The first dust collecting electrode 21 may be made of copper plated with corrosion to prevent corrosion, or may be made of another metal such as tungsten. (8) The voltage of the ionization electrode 1 is -4 kV, the voltage of the first dust collection electrode 21 is +2 kV, and the voltage of the second dust collection electrode 22 is applied in an offset state such as +8 kV, or the voltage of the ionization electrode 1 is applied. -8 kV, first dust collecting electrode 2
The voltage of 1 is -2 kV, the voltage of the second dust collecting electrode 22 is +4
It can be added to the offset state like kV. That is, voltages having different absolute values can be applied to the ionization electrode 1 and the second dust collection electrode 22. (9) The dust collecting paper 6 may not be arranged on the first dust collecting electrode 21.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional air cleaning device.

FIG. 2 is a vertical sectional view showing a part of the air cleaning device of FIG.

FIG. 3 is a perspective view showing the air cleaning device of the first embodiment of the present invention.

4 is a vertical cross-sectional view showing a part of the air cleaning device of FIG.

FIG. 5 is an enlarged sectional view showing a part of FIG. 4 with dust collecting paper.

FIG. 6 is a cross-sectional view of the air cleaning device of the second embodiment, which is taken along the line AA in FIG.

FIG. 7 is a plan view of the air cleaning device of FIG.

[Explanation of symbols]

 1 Ionization Electrode 4 Support 6 Dust Collection Paper 21 First Dust Collection Electrode 22 Second Dust Collection Electrode 24 Small Hole

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[Procedure amendment]

[Submission date] May 16, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

The present invention for achieving the above object comprises an ionizing electrode, a dust collecting electrode, a support for the ionizing electrode and the dust collecting electrode, and a surface for contacting the dust collecting electrode. In the air cleaning device having the structure for arranging the dust collecting sheet to adsorb dust on the dust collecting sheet, the dust collecting electrode is a conductor plate having a large number of small holes or irregularities. The present invention relates to an air cleaning device. As described in claim 2, the dust collecting electrode is at least the first and second dust collecting electrodes 2 and 3, and the second dust collecting electrode arranged farther than the ionizing electrode has a large number of small holes or irregularities. Can be provided. Further, as described in claim 3, small holes or irregularities can be provided in both the first and second dust collecting electrodes. Further, as described in claim 4, the surface area of the dust collecting electrode is collected regardless of the presence or absence of small holes or irregularities in the dust collecting electrode and the presence or absence of the first and second dust collecting electrodes 2 and 3. good Mashiku area dust sheet 50% or more, more preferably it is desirable that 70% or more. Further, as described in claim 5, it is desirable that the surface area of the second dust collecting electrode be larger than the surface area of the first dust collecting electrode.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) The second dust collecting electrode 22 can be divided into two or more pieces. Further, the first dust collecting electrode 21 can be divided into a plurality of parts. (2) The first dust collecting electrode 21 can be omitted. (3) Like the second dust collecting electrode 22, the first dust collecting electrode 21 may have a small hole. In this case, it is desirable that the small holes in the first dust collecting electrode 21 be uniformly distributed with respect to the ionization electrode 1. (4) Instead of the small holes 24, irregularities having a height (depth) of preferably 0.2 to 2 mm can be provided on the surface of the second dust collecting electrode 22. (5) It is possible to add a function of providing a fan to remove dust in the air with a filter. (6) The ratio of the total surface area of the first and second dust collecting electrodes 21, 22 to the portion of the dust collecting paper 6 on the outer peripheral surface of the support 4 can be changed. To achieve uniform adsorption of dust in the collecting toilet paper 6, is good Mashiku the ratio is 50% or more,
It is more preferably 70% or more. (7) The first dust collecting electrode 21 may be made of copper plated with corrosion to prevent corrosion, or may be made of another metal such as tungsten. (8) The voltage of the ionization electrode 1 is -4 kV, the voltage of the first dust collection electrode 21 is +2 kV, and the voltage of the second dust collection electrode 22 is applied in an offset state such as +8 kV, or the voltage of the ionization electrode 1 is applied. -8 kV, first dust collecting electrode 2
The voltage of 1 is -2 kV, the voltage of the second dust collecting electrode 22 is +4
It can be added to the offset state like kV. That is, voltages having different absolute values can be applied to the ionization electrode 1 and the second dust collection electrode 22. (9) The dust collecting paper 6 may not be arranged on the first dust collecting electrode 21.

Front Page Continuation (72) Inventor Kazuhiko Murao 3-7-3 Nakamachi, Musashino City, Tokyo TEAC Corporation

Claims (5)

[Claims] 1. A device for collecting dust, comprising an ionization electrode, a dust collection electrode, a support for the ionization electrode and the dust collection electrode, and disposing a dust collection sheet in contact with the surface of the dust collection electrode. An air purifying device configured to adsorb dust on a sheet, wherein the dust collecting electrode is a conductor plate having a large number of small holes or irregularities. 2. A dust collecting electrode comprising: an ionizing electrode, a dust collecting electrode, a support for the ionizing electrode and the dust collecting electrode, and a dust collecting sheet disposed so as to contact a surface of the dust collecting electrode. In the air purifying device configured to adsorb dust on a sheet, the dust collecting electrode includes a first dust collecting electrode disposed near the ionization electrode, and a first dust collection electrode disposed near the ionization electrode.
Second dust collecting electrode arranged farther than the second dust collecting electrode, wherein the first dust collecting electrode is a conductor plate having no many small holes or irregularities, and the second dust collecting electrode. The electrode is a conductor plate having a large number of small holes or irregularities, and the dust collecting sheet is arranged so as to contact at least the second dust collecting electrode. 3. An ionization electrode, a dust collection electrode, a support for the ionization electrode and the dust collection electrode, and a dust collection sheet disposed so as to contact the surface of the dust collection electrode. In an air purifying device configured to adsorb dust on a sheet, the dust collecting electrode includes a first dust collecting electrode arranged near the ionization electrode, and the first dust collection electrode with respect to the ionization electrode.
And a second dust collecting electrode disposed farther than the second dust collecting electrode, wherein both the first and second dust collecting electrodes are conductor plates having a large number of small holes or irregularities. The air cleaning device according to claim 1. 4. An ionization electrode, a dust collection electrode, a support for the ionization electrode and the dust collection electrode, and a dust collection sheet disposed so as to contact the surface of the dust collection electrode. In an air cleaning device configured to adsorb dust on a sheet, the dust collecting electrode is arranged on a surface of the support, and the dust collecting sheet is arranged on the support and the dust collecting electrode. And the surface area of the dust collecting electrode is set to 30% or more of the surface area of the dust collecting sheet disposed on the support and the dust collecting electrode. . 5. An ionization electrode, a first dust collection electrode arranged near the ionization electrode, and a second dust collection electrode arranged farther than the first dust collection electrode with respect to the ionization electrode.
And a support for supporting the ionization electrode and the first and second dust collecting electrodes, and a dust collecting sheet so as to come into contact with at least the surface of the second dust collecting electrode. In the air cleaning device configured to adsorb dust on the dust collecting sheet, wherein the second dust collecting electrode has a surface area larger than that of the first dust collecting electrode. Air purifier to do.