JPH08155336A - Air cleaner - Google Patents

Abstract

PURPOSE: To provide an air cleaner in which a float electrode is eliminated and whose equipment constitution is miniaturized. CONSTITUTION: A high voltage applying means 9 applies high voltage between a discharge electrode 2 and a counter electrode 3 through the discharge electrode 2 and a Zener diode 8. To an ionizer 4, voltage corresponding to the difference between voltage applied from the high voltage applying means 9 and fixed voltage formed by the Zener diode 8 is applied to generate corona discharge, and by this corona discharge, dust is charged to either positive or negative. Between a high potential side electrode 5 and a low potential side electrode of a collector 7, fixed voltage formed by the Zener diode 8 is applied, and in the collector 7, dust charged in the ionizer 4 is attracted and collected. Because of this constitution, air cleaning action is effected without installing a float electrode. As a result, an air cleaner is miniaturized, and since voltage is stably applied to the collector, stable operation is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier, and more particularly, to efficiently remove dust floating in the air of automobiles, ships, aircrafts, indoors of general buildings, factories, etc. Regarding air purifier.

[0002]

2. Description of the Related Art Conventionally, air cleaners having an ionizer to improve dust collection efficiency have been well known.

As shown in FIG. 9, an air purifier 50 using an ionizer has a discharge electrode 51 and a counter electrode 52 from the upstream side to the downstream side of an air flow path, and dust is generated by corona discharge. The ionizer 53 that charges the positive side or the negative side, the float electrode 54 to which a bias voltage is applied by the ion current flowing from the discharge electrode 51 of the ionizer 53, the high potential side electrode 55 connected to the float electrode 54, and the ionizer 53. A collector 57 having a low-potential side electrode 56 charged by a charge different from that charged in is arranged in order, and a high voltage power source 58 for applying a high voltage is connected to the discharge electrode 51 and the counter electrode 52.

Next, the operation will be described.

When air containing dust is introduced into the air purifier 50, a high voltage is applied between the discharge electrode 51 and the counter electrode 52 by the high voltage power source 58, and the ionizer 53 becomes
The dust is charged to the positive side or the negative side by performing corona discharge.

In parallel with this, the float electrode 54 is
A bias voltage is applied by the ion current flowing from the discharge electrode 51 of the ionizer 53, and the high potential side electrode 55 of the collector 57 is charged to the same charge as the dust charged by the ionizer 53. Also, collector 5
The low potential side electrode 56 of No. 7 is charged to a different charge from that charged by the ionizer 53.

As a result, the collector 57 adsorbs and collects the dust in the air introduced by the Coulomb attraction, and sends it out as clean air.

[0008]

As described above, in the air cleaner using the ionizer 53, the ionizer 53, the float electrode 54, and the collector 57 are constructed separately.

Further, since the float electrode 54 is composed of a wire mesh, punching metal or the like, distortion may occur due to problems in strength and manufacturing.

As a result, the distance between the ionizer 53 and the float electrode 54 is unlikely to be constant, and the collector 5
It was necessary to provide a means for preventing the high voltage supplied to No. 7 from becoming constant and preventing abnormal discharge.

Further, the number of parts increases, and it is necessary to arrange them along the air flow path, so that the size in the air flow direction becomes large and the cost also increases.

Furthermore, the float electrode 54 and the collector 5
It is necessary to set the distance t'of No. 7 to the low-potential side electrode 56 at a predetermined distance or more so as not to cause abnormal discharge and the like, which hinders the miniaturization.

Therefore, an object of the present invention is to provide an air cleaner in which the float electrode can be omitted and the size of the apparatus can be reduced.

[0014]

In order to solve the above-mentioned problems, the invention according to claim 1 has a discharge electrode and a counter electrode, and charges dust by corona discharge with either positive or negative charge. An ionizer and a downstream side of the ionizer, which has a high potential side electrode and a low potential side electrode arranged to oppose the high potential side electrode, and the high potential side electrode and the counter electrode are electrically A collector for adsorbing and collecting dust charged by the ionizer, and one or a plurality of Zeners having one end connected to the counter electrode and the high-potential side electrode and the other end grounded. 3. The invention according to claim 2, further comprising: a diode, and a high voltage applying unit having a high voltage side terminal connected to the discharge electrode and a low voltage side terminal grounded. An ionizer having a counter electrode for charging dust with either positive or negative charges by corona discharge, and a high potential side electrode, which is provided on the downstream side of the counter, and is arranged opposite to the high potential side electrode. A collector having a low potential side electrode for adsorbing and collecting dust charged by the ionizer, one or more Zener diodes having one end connected to the counter electrode and the other end grounded, and a high voltage High-voltage applying means having a side terminal connected to the discharge electrode and a low-voltage side terminal grounded, and the high-potential side electrode of the collector is arranged close to the counter electrode at a distance t. It

According to a third aspect of the invention, in the invention according to the second aspect, the counter electrode of the ionizer is
The collector is configured such that the low-potential side electrode is arranged farther from the high-potential side electrode.

[0016]

According to the invention of claim 1, the high voltage applying means applies a high voltage between the discharge electrode and the counter electrode through the discharge electrode and the Zener diode. A voltage corresponding to the difference between the voltage applied by the high-voltage applying means and the constant voltage generated by the Zener diode is applied to the ionizer to generate corona discharge, and this corona discharge causes dust to have a positive or negative charge. Be charged to. A constant voltage generated by a Zener diode is applied between the high potential side electrode and the low potential side electrode of the collector, and the charged dust is adsorbed and collected by the ionizer at the collector.

With this structure, the air cleaning operation can be performed without providing the float electrode, and as a result, the air cleaner can be downsized, and the voltage can be stably applied to the collector. Stable operation can be performed.

According to the second aspect of the invention, the high voltage applying means applies a high voltage between the discharge electrode and the counter electrode of the ionizer through the discharge electrode and the Zener diode.
A voltage corresponding to the difference between the voltage applied by the high-voltage applying means and the constant voltage generated by the Zener diode is applied to the ionizer, causing corona discharge, and this corona discharge turns dust into either positive or negative charges. Be charged. On the other hand, a bias voltage due to the ion current from the ionizer is generated at the high potential side electrode of the collector arranged close to the ionizer, and this bias voltage is applied between the high potential side electrode and the low potential side electrode of the collector. The dust charged by the ionizer is adsorbed and collected by the collector.

As described above, since a high voltage is applied between the discharge electrode of the ionizer and the counter electrode via the Zener diode, the applied voltage can be arbitrarily adjusted and set, and the high potential side electrode of the collector is used as the counter electrode. Can be placed close to each other at a distance t. As a result, the size of the air cleaner can be reduced, and a voltage can be stably applied to the collector.

According to the invention of claim 3, the low potential side electrode of the collector is arranged farther from the high potential side electrode with respect to the ionizer, whereby abnormal discharge of the low potential side electrode can be prevented. , Can be operated stably.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings. First Embodiment FIG. 1 shows a schematic sectional view of the main part of an air cleaner of a first embodiment corresponding to the invention described in claim 1.

The air purifier 100 includes an air supply fan 1 for introducing air, which is a cleaning target including dust, a linear discharge electrode 2 connected to a high potential side and a low potential side (ground side). An ionizer 4 which has a plate-shaped counter electrode 3 connected to the above and charges the dust with a positive charge by performing corona discharge between the electrodes 2 and 3, and a high potential side electrode 5 are connected to the counter electrode 3. And a collector 7 whose low potential side electrode 6 is connected to the ground, and a zener diode 8 (corresponding to a voltage of 2 kV) which is connected in the reverse direction between the connection line between the counter electrode 3 and the high potential side electrode 5 and the ground. , A high-voltage power supply 9 for applying a high voltage (for example, 7 kV) between the discharge electrode 2 and the counter electrode 3 via the Zener diode 8 to cause corona discharge.
And a pre-filter 10 provided upstream of the ionizer 4 for removing large dust in advance and extending the life of the ionizer 4 and the collector 7.

The high potential side electrode 5 of the collector 7 is shown in FIG.
As shown in the sectional view of (a), an insulator film 5B such as polyethylene having a protrusion 5A as a spacer for keeping a constant distance from the adjacent low potential side electrode 6 and a conductive paint or a conductive material. It is formed with the formed thin film electrode 5C.

Similarly, as shown in the sectional view of FIG. 2B, the low potential side electrode 6 of the collector 7 has a protrusion 6A as a spacer for keeping a constant distance from the adjacent high potential side electrode 5.
And an insulating film 6B made of polyethylene or the like and a thin film electrode 6C made of a conductive paint or a conductive material.

Here, the distance between the high-potential side electrode 5 and the low-potential side electrode 6 to be maintained by the protrusion 5A or the protrusion 6A will be described with reference to FIG.

FIG. 3 shows the relationship between the dust collection efficiency (vertical axis) and the applied voltage between electrodes (horizontal axis).

As shown in FIG. 3, when a certain voltage is applied between the high-potential side electrode 5 and the low-potential side electrode 6 and the inter-electrode applied voltage is 0.5 kV / mm, the dust collection efficiency is 50 [%]. ,
It is in a practically usable range.

Further, if the voltage applied between the electrodes exceeds 4 kV / mm by reducing the distance with the same voltage, abnormal discharge (arc discharge) will start and the dust collection efficiency will drastically decrease.

Therefore, the upper limit of the practical usable range is the applied voltage between the electrodes is less than 4 kV / mm, and the practical usable range is 0.5 kV / mm or more and less than 4 kV / mm. It is necessary to set the distance between the electrodes so that

Next, the operation will be described.

First, the air supply fan 1 introduces air, which is a cleaning target, containing dust into the air cleaner 1, and the pre-filter 10 removes large dust from the introduced air. In parallel with this, the high voltage power supply 9 applies a high voltage (for example, 7 kV) between the discharge electrode 2 and the counter electrode 3 via the Zener diode 8. As a result, a voltage difference between the voltage of the high-voltage power supply 9 and the constant voltage generated by the Zener diode is generated between the discharge electrode 2 and the counter electrode 3, more specifically, 5 kV (= 7) in the above example. The voltage of −2 kV) is applied, the ionizer 4 performs corona discharge, and the dust passing through the ionizer 4 is charged with a positive charge.

At this time, the constant voltage (2 kV in the above example) generated by the Zener diode 8 is applied between the high potential side electrode 5 and the low potential side electrode 6 of the collector 7.

As a result, the collector 7 becomes the ionizer 4
Due to Coulomb's attractive force, the dust with a positive charge is adsorbed and collected.

As described above, according to the first embodiment, since a high voltage is applied between the discharge electrode 2 and the counter electrode 3 of the ionizer 4 via the Zener diode 8, the applied voltage can be adjusted arbitrarily. It is possible to set, the conventional float electrode can be omitted, and as a result, the air cleaner can be downsized, and the Zener diode 8 can stably apply a voltage to the collector 7. .

Although only one Zener diode 8 is shown in FIG. 1, a plurality of Zener diodes may be connected in series so as to generate the same voltage. For example, when generating the above-mentioned 2 kV, it is sufficient to connect five Zener diodes capable of generating 400 V in series. Second Embodiment Next, FIG. 4 shows a schematic sectional view of a main part of an air cleaner of a second embodiment corresponding to claims 2 and 3.

The air purifier 200 includes an air supply fan 21 for introducing air to be cleaned including dust, a linear discharge electrode 22 connected to the high potential side, and a low potential side (ground side). An ionizer 24 that has a plate-shaped counter electrode 23 connected to the one end and that charges the dust to a positive charge by performing corona discharge between the two electrodes 22 and 23 is connected in common at one end side by a connection line 25F. Electrode 23
And a high-potential-side electrode 25 that is closely arranged at a distance t,
Also, the low potential side electrode 26 provided via the distance tt which is larger than the distance t from the counter electrode 23 and does not cause abnormal discharge is connected in the opposite direction between the collector 27 and the counter electrode 23 and the ground. The zener diode 28 (corresponding to a voltage of 3 kV) and the discharge electrode 22-opposite electrode 23 via the zener diode 28 for corona discharge.
High-voltage power supply 29 that applies a high voltage (for example, 8 kV) between
And a pre-filter 30 provided upstream of the ionizer 24 for removing large dust in advance and extending the life of the ionizer 24 and the collector 27.

Here, the high potential side electrode 25 of the collector 27
The low potential side electrode 26 will be described with reference to FIG.

As shown in the top view of FIG. 5A, the high potential side electrode 25 is made of polyethylene or the like having a protrusion 25A as a spacer for keeping a constant distance from the adjacent low potential side electrode 26. An insulator film 25B, and a thin film electrode 25C formed on the back surface of the insulator film 25B with a conductive paint or conductive material 25C1 and a conductive paint or conductive material 25C2,
It is configured with. In addition, in FIG. 5A, the insulator film 25B is illustrated as being made of a transparent material, and reference symbols A and B in the figure indicate the same directions as the reference symbols A and B in FIG. . For reference, FIG. 5B shows a CC cross-sectional view of the high potential side electrode 25.

FIG. 6A shows a top view of a high potential side electrode 25 'which is another example of the high potential side electrode.

The high potential side electrode 25 'is an insulator film 25'B such as polyethylene having a protrusion 25'A as a spacer for keeping a constant distance from the adjacent low potential side electrode 26.
And a conductive paint or conductive material 25'C1 and a conductive paint or conductive material 25'C2 on the back surface of the insulator film 25'B.
And a thin film electrode 25'C formed in. In addition, in FIG. 6A, the insulator film 25′B is illustrated as being made of a transparent material, and reference symbols A and B in the figure indicate the same directions as the reference symbols A and B in FIG. ing. For reference, FIG. 6B shows a C′-C ′ cross-sectional view of the high potential side electrode 25 ′.

FIG. 6C shows a top view of a high potential side electrode 25 ″ which is another example of the high potential side electrode.

The high potential side electrode 25 "is an insulator film 25" B such as polyethylene having a protrusion 25 "A as a spacer for keeping a constant distance from the adjacent low potential side electrode 6.
And conductive coating 25 "C11,2 on the back surface of the insulator film 25" B.
5 "C12 and a thin film electrode 25" C formed of a conductive material 25 "C2.
In FIG. 4C, a transparent material is used as the insulator film 25 ″ B, and reference characters A and B in FIG.
The same direction as the reference signs A and B is shown. For reference, FIG. 6D shows a C ″ -C ″ cross-sectional view of the high potential side electrode 25 ″.

As shown in the top view of FIG. 7A, the low-potential-side electrode 26 has a constant distance from the adjacent high-potential-side electrode 25 (or high-potential-side electrodes 25 ', 25 "). An insulating film 26B made of polyethylene or the like having a protruding portion 26A as a spacer to be kept and a thin film electrode 26C formed of a conductive paint or a conductive material on the back surface of the insulating film 26B are provided. In 7 (a), the insulator film 2
6B is illustrated using a transparent material, and reference numerals A and B in the drawing indicate the same directions as those of reference numerals A and B in FIG. For reference, FIG. 7B shows an EE cross-sectional view of the low potential side electrode 26.

When actually arranging the high potential side electrode 25 (or the high potential side electrodes 25 ', 25 ") and the low potential side electrode 26, as shown in FIG. 8, the center line DD (FIG. 5) is used.
(See (a), FIG. 6 (a), FIG. 6 (c), and FIG. 7 (a))
Are arranged in the same plane F, and the high potential side electrodes 25 and the low potential side electrodes 26, which are alternately arranged, are arranged substantially parallel to each other. In this case, reference numerals A and B in the figure
Indicates the same direction as reference numerals A and B in FIG.

As a result, the high potential side electrode 25 and the counter electrode 2
3 is set as the distance t, and the low potential side electrode 26
The distance between the counter electrode 23 and the counter electrode 23 is set larger than the distance t and is set to a distance tt at which abnormal discharge does not occur. By doing so, abnormal discharge between the high potential side electrode 25 and the low potential side electrode 26 can be prevented.

Next, the operation will be described.

First, the air supply fan 21 introduces dust-containing air to be cleaned into the air purifier 200, and the pre-filter 30 removes large dust from the introduced air. In parallel with this, the high voltage power supply 29 applies a high voltage (for example, 8 kV) between the discharge electrode 22 and the counter electrode 23 via the Zener diode 28. As a result, a voltage difference between the voltage of the high-voltage power supply 29 and the constant voltage generated by the Zener diode 28 is generated between the discharge electrode 22 and the counter electrode 23, more specifically, 5 kV (=
(8-3 kV) voltage is applied, the ionizer 24 performs corona discharge, and the dust passing through the ionizer 24 is charged with positive charges.

At this time, the high potential side electrode 25 of the collector 27
Between the low potential side electrodes 26 is determined by the constant voltage (3 kV in the above example) generated by the Zener diode 28 and the distance t between the high potential side electrode 25 (connection line 25F) and the counter electrode 23. A voltage is applied. Specifically, 2
A constant voltage of 2.5 kV will be applied.

As a result, the collector 27 adsorbs dust having a positive charge by the ionizer 24 by the Coulomb attraction and collects it.

As described above, according to the second embodiment, the ionizer 24 is configured to stably generate the voltage applied to the collector 27 by the distance t between the Zener diode 28 and the float electrode 25F and the counter electrode 23. And the connection line 25F (and thus the high potential side electrode 25) can be arranged close to each other, the size of the air cleaner can be reduced, and the voltage applied to the collector 27 via the Zener diode 28 is stable. Therefore, stable dust adsorption and collection can be performed.

Although only one Zener diode 28 is shown in FIG. 4, it is also possible to connect a plurality of Zener diodes in series so as to generate the same voltage. For example, when generating the above-mentioned 3 kV, it is sufficient to connect six Zener diodes capable of generating 500 V in series.

In each of the above embodiments, the air supply fan is provided on the upstream side of the air flow path, but it may be provided on the downstream side.

[0053]

According to the first aspect of the present invention, a constant voltage generated by the Zener diode is applied between the high potential side electrode and the low potential side electrode of the collector to remove dust charged by the ionizer. Since it is adsorbed and collected, it is not necessary to provide a float electrode, the size of the air cleaner can be reduced, and a voltage can be stably applied to the collector, so that a stable operation can be performed.

According to the second aspect of the invention, a constant bias voltage is generated in the float electrode by the ion current from the ionizer based on the distance t, and the high potential side electrode and the low potential side electrode of the collector are connected. Is applied with this bias voltage, and in order to adsorb and collect the dust charged by the ionizer, the high-potential-side electrode of the collector is arranged in close proximity to the counter electrode via the distance t. The size can be reduced, and a voltage can be stably applied to the collector, so that stable operation can be performed.

According to the third aspect of the present invention, since the position of the low potential electrode of the collector is displaced from that of the high potential electrode, more stable operation can be performed against abnormal discharge.

[Brief description of drawings]

FIG. 1 is a schematic configuration sectional view of an air cleaner according to a first embodiment.

FIG. 2 is a cross-sectional view of a high potential side electrode and a low potential side electrode of the first embodiment.

FIG. 3 is an explanatory diagram of installation distances of a high potential side electrode and a low potential side electrode of the first embodiment.

FIG. 4 is a schematic configuration sectional view of an air cleaner of a second embodiment.

FIG. 5 is an explanatory diagram of a high potential side electrode of a second embodiment.

FIG. 6 is an explanatory diagram of another high-potential side electrode of the second embodiment.

FIG. 7 is an explanatory diagram of a low potential side electrode of a second embodiment.

FIG. 8 is an explanatory diagram of the installation state of the high potential side electrode and the low potential side electrode of the second embodiment.

FIG. 9 is a schematic structural cross-sectional view of a conventional air cleaner.

[Explanation of symbols]

100, 200 Air purifier 1, 21 Air supply fan 2, 22 Discharge electrode 3, 23 Counter electrode 4, 24 Ionizer 5, 25 High potential side electrode 5A, 6A, 25A, 25'A, 25 "A, 26A Protrusion Part 5B, 6B, 25B, 25'B, 25 "B, 26B Insulator film 5C, 6C, 25C, 25'C, 25" C, 26C Thin film electrode 6, 26 Low potential side electrode 7, 27 Collector 8, 28 Zener diode 9,29 High-voltage power supply 10,30 Pre-filter 25C1, 25C2, 25'C1, 25'C2, 25 "
C1, 25 "C2 conductive paint or conductive material 25F connecting wire

Claims (3)

[Claims] 1. An ionizer having a discharge electrode and a counter electrode for charging dust with a positive or negative charge by corona discharge, and a high potential side electrode and this high potential provided on the downstream side of the ionizer. A collector that has a low-potential side electrode that is arranged opposite to the side electrode, and that the high-potential side electrode and the counter electrode are electrically connected and that adsorbs and collects the dust charged by the ionizer. A Zener diode having one end connected to the counter electrode and the high potential side electrode and the other end grounded; and a high voltage side terminal connected to the discharge electrode, and a low voltage side An air purifier comprising: a high-voltage applying unit whose terminal is grounded. 2. An ionizer having a discharge electrode and a counter electrode for charging dust with a positive or negative electric charge by corona discharge; and a high potential side electrode and the high potential side electrode provided on the downstream side of the counter. A low potential side electrode arranged opposite to the side electrode, and a collector for adsorbing and collecting dust charged by the ionizer; one end connected to the counter electrode and the other end grounded; A plurality of Zener diodes; and a high voltage applying unit having a high-voltage side terminal connected to the discharge electrode and a low-voltage side terminal grounded, the high-potential side electrode of the collector being located at a distance t from the counter electrode. An air purifier characterized by being placed close to each other. 3. The air purifier according to claim 2, wherein the low potential side electrode of the collector is arranged farther from the high potential side electrode than the counter electrode of the ionizer.