JPH035213B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an air purifier, and more specifically, it is used in homes, offices, clean rooms, stores,
The present invention relates to an air purifier whose purpose is to purify the environmental air in hospitals, automobiles, etc.

[Prior Art] Conventional air cleaners of this type include a filter type as shown in FIG. 10 and an electrostatic type as shown in FIG. 11. In this case, the former, that is, a filter-type air purifier, is composed of a fan c in a main body b constituting an air passage a, and a filter d located upstream of the fan c, and a filter d that floats in the air passage a. Filter the dust
It has a structure that purifies it by the filtration action of , and has the advantage that it has a simple structure and can be manufactured in a small size. The latter, that is, an electrostatic air purifier, includes a fan c disposed in a main body b constituting an air passage a, a discharge electrode e and a discharge counter electrode f located upstream of the fan c, and a discharge electrode e and a discharge counter electrode f located upstream of the fan c. A dust collection electrode g located between the discharge electrode e and the discharge counter electrode f and the fan c
and a dust collection counter electrode h, and an air passage a.
The structure is such that the dust floating inside is charged by a discharge electrode e and a discharge counter electrode f, and the dust is attached to a dust collection electrode g, thereby purifying the contaminated environmental air.
This electrostatic type air cleaner has advantages such as lower pressure loss and a longer lifespan of the dust collection electrode than the above-mentioned filter type air cleaner.

[Problems to be Solved by the Invention] However, in the above-mentioned filter type air purifier, in order to increase the dust collection efficiency, it is necessary to make the mesh of the filter d finer or to reduce the wind speed passing through the filter d. filter d
Making the mesh finer leads to an increase in pressure loss,
Further, lowering the air velocity passing through the filter d has the disadvantage that the throughput per unit volume is lowered, and furthermore, there is a disadvantage that the pressure loss is large and the life of the filter d is short. On the other hand, with electrostatic air purifiers, in order to increase dust collection efficiency, methods such as lowering the passing air velocity or increasing the discharge voltage are taken, but reducing the passing air velocity is the same as with the filter type mentioned above. In addition, increasing the discharge voltage resulted in an increase in the amount of ozone generated.

In order to solve the above problem, the discharge section is composed of a grid-like ground electrode with many holes and a needle-shaped discharge electrode whose tip faces the center of each hole of the ground electrode. (Refer to Japanese Patent Publication No. 36-16899).
Because it is necessary to attach a large number of needle-shaped discharge electrodes to the mounting frame so that they each protrude, the structure is not only complicated, but also difficult to accurately align with the center of each hole in the ground electrode. There was a problem that cleaning could not be performed. Furthermore, as charged filters, there are also known filters made of a mixture of + and - chargeable fiber materials.
44-20226), this type of device has the disadvantage that it cannot efficiently adsorb charged dust in the air if it is simply arranged perpendicularly in the air passage. installation inside,
Some means was needed to facilitate removal.

This invention was made in view of the above circumstances, and it is an object of the present invention to provide an air purifier that can efficiently collect dust with low current consumption and also allows easy installation and replacement of a charging filter. It is something to do.

[Means for Solving the Problems] In order to solve the above technical problems, the air cleaner of the present invention has a discharge electrode and a discharge counter electrode for performing corona discharge disposed on the upstream side of the air passage, and Assuming that the air purifier is equipped with a charged filter on the downstream side of the air passage, the discharge electrode is formed of a metal plate with a pointed discharge protrusion protruding from the discharge electrode. is formed of a metal plate with a through hole located at the center of the tip of the pointed protrusion of the discharge electrode or a resin substrate whose surface is coated with a conductive metal, and
The charged filter is formed of a large number of permanently polarized short fibers laminated irregularly, and is arranged in a serpentine shape in a direction perpendicular to the air passage within a holder that opens along the air passage. It is what it is.

[Effect] The above technical means works as follows.

The discharge electrode is formed of a metal plate with a pointed discharge protrusion protruding from it, and the discharge counter electrode is formed of a metal plate with a through hole located at the center of the tip of the pointed discharge protrusion of the discharge electrode. Alternatively, by forming a resin substrate whose surface is coated with a conductive metal, the discharge electrode and the discharge counter electrode can be easily and accurately aligned. Further, due to the corona discharge between the discharge electrode and the discharge counter electrode, the dust in the air flowing in the air passage is charged, and this charged dust in the air is attracted to the charging filter located on the downstream side, and the dust is removed. Since the clean air is released into the atmosphere from the downstream side, dust collection efficiency can be improved. In addition, the charged filter has a structure in which permanently polarized short fibers are laminated, and by arranging it in a meandering manner in a direction perpendicular to the air passage within a holder that opens along the air passage, no electric charge is required. At the same time, the structure is simple, it can be made compact, it is easy to handle, and the charging filter can be easily replaced.

[Example] Examples of the present invention will be described in detail below based on the drawings.

FIG. 1 is a sectional view showing a first embodiment of the air cleaner of the present invention. The main parts are composed of a discharge electrode 20 for discharge, a discharge counter electrode 22, a charging filter 30 disposed on the downstream side of the air passage 12, and a fan 40 for introducing contaminated air into the air passage 12. has been done.

The main body 10 is provided with an air suction port 14 at the top and a discharge port 16 at the bottom, and the suction port 14 and the discharge port 16 are communicated through an air passage 12. Air passage 12 of this main body 10
As shown in FIG. 2, the discharge electrode 20 disposed on the upstream side of the discharge electrode 20 is composed of a metal plate 26 having a plurality of pointed discharge protrusions 24 protruding therefrom. This discharge electrode 20 has a plate thickness of, for example, 0.1 to 3.0 mm, preferably 0.2 to 3.0 mm.
1.0mm stainless steel or ordinary steel, copper, brass,
It is made of a strong conductive metal plate such as aluminum. On the other hand, the discharge counter electrode 22 includes a metal plate made of aluminum alloy or the like with a plurality of circular through holes 28 located at the center of the tip of the pointed protrusion 24 of the discharge electrode 20, or at least the through holes 28. It is formed of a resin substrate 29 whose surface is coated with a conductive metal. In this case, the discharge electrode 20 is connected to the cathode of the power source 50, and the discharge counter electrode 22 is connected to the anode of the power source 50.
When a voltage is applied between the two, corona discharge occurs between the two. In this case, the discharge electrode 20 and the discharge counter electrode 22 may have opposite polarities to perform anodic discharge. Such corona discharge can be generated by, for example, transforming a household AC power supply (100V),
And 4.5~5KV, 0.1~ obtained by rectifying
This can be done with a direct current of 1 mA.

The charged filter 30 is made of a large number of permanently polarized short fibers laminated irregularly, and is arranged in a meandering manner in a direction perpendicular to the air passage 12. Specifically, this charging filter 30 is made of Sumitomo 3M Co., Ltd. under the trade name "Filteret", which is used as a charging air filter material.

Note that a centrifugal type Sirotskov fan is used as the fan 40. Further, the suction port 14 and the discharge port 16 of the main body 10 each have a large number of blades 1.
Furthermore, a pre-filter 60 is disposed at the suction port 14, and a deodorizing filter 70 for deodorizing the air is provided between the charged filter 30 on the discharge port 16 side and the fan 40 in the air passage 12. It is installed perpendicular to the The deodorizing filter 70 is filled with activated carbon, which has a good deodorizing effect, for deodorizing, but it is not limited to activated carbon. For example, it may be filled with a divalent iron ion adsorbent, or a mixture of these may be filled. You may. In this case, as the divalent iron ion adsorbent, one in which a small amount of L-ascorbic acid is added to divalent iron ions is selected. Since this product suppresses the effect of being oxidized to trivalent iron ions by oxygen in the air by reducing L-ascorbic acid, the deodorizing effect is maintained for a long period of time.

Further, a forest bathing agent 80 is disposed in the discharge port 16, and the forest bathing agent 80 mixes aromatic substances of plants that are beneficial for health into the purified air. It's summery.

In FIG. 1, reference numeral 90 is a high-voltage power supply storage box built into the power supply 50, and is used to properly perform corona discharge.

In the air cleaner of the present invention configured as described above, when the fan 40 is driven and a voltage is applied to the discharge electrode 20 and the discharge counter electrode 22,
Contaminated air A in the atmosphere is supplied from the suction port 14 into the air passage 12 of the main body 10, and dust in the air A is negatively charged by corona discharge by the discharge electrode 20 and the discharge counter electrode 22, and, When this air A passes through the charged filter 30 on the downstream side, dust is collected on the anode side of each short fiber due to the charge of the charged filter 30, and the purified air B
only is released into the atmosphere from the discharge port 16.

3 and 4 show a cross-sectional view of a main part and a plan view of the main part showing a second embodiment of the present invention,
This figure shows another form of the above-mentioned discharge counter electrode. That is, by constructing the discharge counter electrode 22, which is centered around the pointed tip of the discharge protrusion 24 of the discharge electrode 20, from the honeycomb core material 22a, the through-holes 28
This is a case where the corona discharge efficiency can be improved by increasing the number of parts.

FIGS. 5 and 6 show a specific perspective view and a sectional view of the charging filter according to the present invention, taking into consideration the ease of handling of the charging filter 30 arranged in a meandering manner. That is,
A holder 34 that is removably disposed within the air passage 12 and has an opening 32 along the air passage 12.
By disposing a charging filter 30 arranged in a meandering manner in a direction perpendicular to the air passage 12, the adsorption of dust charged by the corona discharge by the discharge electrode 20 and the discharge counter electrode 22 is improved. In addition, the charged filter 30 can be handled easily. In addition, the code 36 is
This is a handle attached to the side of the holder 34 for attaching and detaching the charging filter 30.

FIG. 7 shows another form of the charged filter, in which the strength of the charged filter is improved. That is, by interposing, for example, corrugated reinforcing spacers 38 between adjacent portions of the charged filter 30 configured in a meandering shape, the strength and life of the charged filter 30 can be improved, and moreover, air purification can be achieved. It is possible to increase the life of the machine.

A comparative experiment was conducted between the air cleaner of the present invention configured as described above and conventional fiber filter type and charged filter type in terms of the relationship between dust collection efficiency and filter passing wind speed, and the result was as shown in Figure 8. Experimental results were obtained, and it was found that the air purifier of the present invention, which is an electric charge and charged filter type, had extremely high dust collection efficiency. In this case, in the air purifier of this invention, the discharge voltage is -2.9KV and the current is
A 0.01mA one was used. In addition, the charging filter type was 300gr/ ^m2 ,
In the air purifier of this invention, it is rougher than this.
100gr/ ^m2 was used. In addition, a comparison experiment was conducted between the air purifier of the present invention and one in which the corona discharge part and the charged filter part are charged by the same power source, and each discharges a negative discharge or a positive discharge. As shown in the figure, the air cleaner of the present invention had higher dust collection efficiency and consumed less current.

[Effects of the Invention] As explained above, since the air cleaner of the present invention is configured as described above, the following effects can be obtained.

(1) The discharge electrode was formed from a metal plate with a pointed discharge protrusion protruding from it, and the discharge counter electrode was formed with a through hole located at the center of the tip of the discharge electrode. Since it is made of a metal plate or a resin substrate whose surface is coated with a conductive metal, the discharge electrode and the discharge counter electrode can be easily and easily aligned, and the discharge and dust collection can be easily performed with low current consumption. Efficiency can be improved.

(2) Complex electrical circuits are not required, and the charged filter is configured in a meandering manner by itself.
The structure is simple, easy to handle, and dust collection efficiency can be improved.

(3) Since the charged filter has no electrical connection and is disposed inside the holder that opens into the air passage, the charged filter can be replaced easily and safely.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the air cleaner of the present invention, FIG. 2 is an exploded perspective view of the first embodiment,
3 is a sectional view of a main part of a second embodiment of the present invention, FIG. 4 is a plan view of a main part of FIG. 3, FIG. 5 is a perspective view showing a charging filter in this invention, and FIG. 7 is a perspective view showing another form of the charged filter, and FIG. 8 is a comparison of dust collection efficiency between the air purifier of the present invention and conventional filter type and charged filter type. Passing wind speed characteristic curve diagram, Figure 9 is a dust collection efficiency (current)-voltage characteristic curve diagram comparing the air cleaner of the present invention with those of the negative discharge/charge type and the positive discharge/charge type.
FIG. 10 is a schematic sectional view of a conventional filter type air cleaner, and FIG. 11 is a schematic sectional view of a conventional electrostatic type air cleaner. Explanation of symbols, 10...Main body, 12...Air passage,
14... Suction port, 16... Discharge port, 20... Discharge electrode, 22... Discharge counter electrode, 24... Discharge protrusion, 2
6...metal plate, 28...through hole, 29...metal plate,
Resin substrate coated with conductive metal on the surface, 30...
Charging filter, 32...opening, 34...holding body, 40...fan.

Claims (1)

[Claims] 1 A discharge electrode for performing corona discharge and a discharge counter electrode are arranged on the upstream side of the air passage, and a charged filter is arranged on the downstream side of the air passage. The discharge counter electrode is formed of a metal plate with a protruding protrusion, and the discharge counter electrode is formed of a metal plate with a through hole located at the center of the tip of the pointed protrusion of the discharge electrode, or a metal plate with a conductive metal on the surface. The charged filter is formed of a coated resin substrate, and the charged filter is formed of a large number of irregularly laminated permanently polarized short fibers, and the air passage and the air passage are provided in a holder that opens along the air passage. An air purifier characterized by being arranged in a meandering manner in orthogonal directions.