JPH05168974A - Air purifier - Google Patents

Abstract

PURPOSE:To use an air purifier capable of collecting dust at high speed and not costly as a consumable item. CONSTITUTION:Air containing fine dust is guided to a dust collection chamber using an air blower consisting of a motor 13 and a centrifugal fan 12. The fine dust is electrically charged using a charging part consisting of a needle positive electrode 5 and a flat plate negative electrode 4. In addition, a dust collection electrode 7 with a reversed polarity for capturing the electrically charged fine dust is provided. The dust collection electrode 7 is covered with a dust collection paper 8 as an expendable. The dust collection part 6 composed of the dust collection electrode 7 and the dust collection paper 8 is almost funnelshaped. Further, a spiral blade 11 which constitutes a spiral hollow path is arranged in the dust collection part 6.

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, and more particularly to an electric air purifying apparatus that electrically collects dust, tobacco smoke, mite feces, and other particle components in the air.

[0002]

2. Description of the Related Art Conventionally, as a domestic air cleaning apparatus, a dust collecting electrode is provided for a needle-shaped electrode or a wire electrode, and a high DC voltage (3 to 8 KV) is applied between both electrodes to make dust and the like uniform. There is known a one-stage type in which electric charge is collected and dust is collected at a place. Generally, this type of air cleaning device covers the dust collecting electrode with an inexpensive paper sheet called dust collecting paper, and the dust collecting paper can be replaced. Also,
This type of air cleaning device collides with neutral particles and gives kinetic energy when charged particles move to a dust collecting electrode having a polarity opposite to that of the charged particles, without using a blowing means, and these movement and air The ionic wind along the lines of electric force and the convective air in the room caused by the viscosity of are used.

On the other hand, a blower such as a fan is used as a household air cleaning device, and a permanent charging unit for charging dust particles by corona discharge and a permanent charging unit opposite to the charging unit charged by the charging unit are used. A filtration type two-stage type having a dust collecting portion using a charged electret filter is also known.

[0004]

Among the above-mentioned conventional home air purifiers, the one-stage type air purifier has an advantage that the dust collecting paper, which is a consumable item, can be obtained at a low cost, but the dust collecting is performed flatly. Therefore, it is difficult to provide a blowing means. For this reason, there is a drawback that the dust collection speed is slow in order to deal with the case where a large number of pollutant particles are temporarily generated such as cigarette smoke. On the other hand, the two-stage type does not have the problem of the dust collection speed even in the above case, but since it uses an electret filter for filtration, the problem that the filter as a consumable item is expensive In addition, there is a drawback that the filter becomes clogged as the dirt advances.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional electric air purifying apparatus and to provide an air purifying apparatus which has a high dust collecting speed and can be used as an expendable item at a low cost. ..

[0006]

In order to achieve the above-mentioned object, the air cleaning apparatus of the present invention has an air blowing means for guiding air containing fine dust to a dust collecting chamber, and an air blown by the air blowing means. In an air purifying apparatus comprising: a charging unit for charging fine dust by corona discharge, and a dust collecting unit for collecting the charged dust, which has a dust collecting electrode having a polarity opposite to the polarity of this charging, The dust collecting part is provided with a spiral air passage and a substantially funnel-shaped dust collecting electrode.

[0007]

In the air cleaning apparatus constructed as described above, the air containing the fine dust is guided to the dust collecting chamber by the blowing means.
At this time, the fine dust is charged by the charging portion arranged upstream of the dust collecting chamber, and the air containing the charged fine dust passes through the spiral air passage arranged downstream of the dust collecting chamber. This spiral air path creates a flow path for air along the dust collecting electrode,
Therefore, the time for air to pass through the dust collecting electrode becomes substantially long, and the efficiency of collecting charged dust by the dust collecting electrode becomes high.
The above-mentioned collection of fine dust is due to Coulomb force due to electric charge, but when air passes through the spiral air passage, centrifugal force due to spiral flow acts on dust particles, and this centrifugal force also contributes to collection of fine dust. To do. Further, since it is not a filtration type, it does not cause a pressure loss with time with respect to the blowing means unlike a filter.

[0008]

Embodiments of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view showing an outline of the air cleaning device. In the figure, reference numeral 1 denotes a main body case, and an air inlet 3 is circumferentially provided on an upper portion of the main body case 1 through a prefilter 2 having coarse openings for removing large dust such as cotton dust. There is. Inside the air inlet 3, a needle-shaped positive electrode 3 and a flat plate-shaped negative electrode 4 (corona discharge electrode) for forming a charging portion for charging fine dust in the air are arranged to face each other. A substantially funnel-shaped dust collecting portion 6 having an open central portion is disposed below the charging portion, and the dust collecting portion 6 is disposed so as to cover the substantially funnel-shaped dust collecting electrode 7 and the dust collecting electrode 7. The dust collecting paper 8 of the same shape is used. When the collected dust collects on the dust collecting paper 8, the dust collecting paper 8 can be easily replaced by removing the removable upper case 9.

The upper case 9 is provided with an inverted conical body 10, around which spiral wings 11 are arranged. The spiral blade 11 forms a spiral air path in the substantially funnel-shaped dust collecting portion 6. Reference numeral 12 is a centrifugal fan, 1
Reference numeral 3 denotes a motor, and the centrifugal fan 12 and the motor 13 constitute a blowing unit.

When the power switch 14 is turned on, a voltage of several K to tens of KV is generated by the DC power supply 15 between the needle-shaped positive electrode 5 and the flat plate-shaped negative electrode 4 in the charging portion near the air inlet 3. A positive corona discharge is generated as a result.
The fine dust in the air passing between the needle-shaped positive electrode 3 and the flat plate-shaped negative electrode 4 is positively charged by the positive corona discharge by the blowing means. The positively charged dust is moved downward along the dust-collecting paper 8 by the air-blowing means including the centrifugal fan 12 and the motor 13. This movement passes through the spiral air path formed by the spiral blade 11 provided in the inverted conical body 10. At this time, the Coulomb force generated between the dust collecting electrode 7 having the negative polarity causes the movement. The dust is collected on the dust collecting paper 8.

By providing the dust collecting portion 6 with the spiral air passage and the substantially funnel-shaped dust collecting electrode 7 as described above, the dust collecting portion 6 has a fixed dust collecting electrode as compared with the conventional cylindrical dust collecting electrode. The contact time of the charged dust becomes longer than the dust electrode area. Therefore, the collection efficiency can be increased and it is also effective for re-scattering.

In the above embodiment, the discharge electrode is used as the positive electrode to generate the positive corona discharge. However, the negative electrode may also be used to generate the negative corona discharge. Although the dust collecting paper 8 is used in the above embodiment, the dust collecting paper 8 may be omitted by providing the dust collecting electrode having a detachable structure so that the dust collecting electrode can be washed. it can.

[0013]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the dust collection speed can be made sufficiently high by the air blowing means, and there is no load fluctuation due to dirt unlike the conventional electret filters, which is inexpensive. Dust-collecting paper (similar to a paper filter for coffee) can be used. In addition, for a certain dust collecting pole area, the contact time of the charged dust can be long due to the effect of the spiral air path, so that the collection efficiency can be increased and the behavior that the charged dust jumps on the dust collecting paper can be achieved. It is also effective for the re-scattering shown.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a schematic sectional view of an air cleaning device.

[Explanation of symbols]

 1 Main Body Case 2 Pre-filter 3 Air Inlet 4 Flat Negative Electrode 5 Needle-like Positive Electrode 6 Dust Collection Part 7 Dust Collection Electrode 8 Dust Collection Paper 9 Upper Case 10 Inverted Conical Body 11 Spiral Blade 12 Centrifugal Fan 13 Motor 14 Power Switch

Claims (1)

[Claims] 1. A blower for guiding air containing fine dust to a dust collection chamber, a charging unit for charging fine dust in the air introduced by the blower by corona discharge, and a polarity opposite to the polarity of the charge. An air purifying device having a dust collecting electrode for collecting the charged dust, the spiral dust collecting electrode being provided with a spiral air passage and a substantially funnel-shaped dust collecting electrode. An air purifier characterized by.