JP2006255662A - Air cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cleaner capable of making wetting property of a counter electrode uniform and reducing an amount of a treating liquid used. <P>SOLUTION: The air cleaner is provided with a discharge electrode arranged on a circulation route of air; and the counter electrode for capturing a component to be treated contained in air. Further, the air cleaner is provided with a treating liquid feeding means for feeding the treating liquid for absorbing the component to be treated to the counter electrode; and a treating liquid uniformizing means to make the treating liquid not to deviate by moving the counter electrode. Thereby, even if an amount of treating liquid used is small, the wetting property of the counter electrode can be made uniform. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air cleaner.

  2. Description of the Related Art Conventionally, there is known a dust collector that includes a discharge electrode and a counter electrode, applies a voltage between them to discharge, and charges the dust in the air by the discharge to adhere to the counter electrode. . The dust collector includes a dry dust collector and a wet dust collector. The dry dust collector is designed to drop the dust attached to the surface of the counter electrode by striking and vibrating the counter electrode. The wet dust collector supplies a fluid such as water to the surface of the counter electrode. Then, a liquid film is formed and allowed to flow down, and dust and the like are removed by this liquid film.

For example, Patent Documents 1 and 2 below are disclosed as wet dust collectors. Patent Document 1 discloses a method in which a counter electrode is formed into a wire mesh and a water film is formed, and charged particle components are collected in the water film. Patent Document 2 discloses a water-permeable coating material. There is disclosed a counter electrode that is formed into a cylindrical shape by use and is filled with a fluid having conductivity inside the cylindrical body. Dust and the like can be effectively removed by using a wire mesh formed with a water flow film or a water-permeable coating material as a counter electrode.
Japanese Patent No. 3187205 Japanese Patent No. 2,686,881

  On the other hand, in a conventional apparatus, for example, as shown in FIG. 6, a linear discharge electrode 102 is disposed between two counter electrodes 103 and a voltage is applied between the counter electrode 103 and the discharge electrode 102. The discharge is generated. The air flows from the upper side to the lower side of the apparatus shown in FIG. At this time, components to be treated such as dust and gaseous components contained in the air are charged by the discharge region P and adhere to the counter electrode 103. A water flow film is formed inside or on the surface of the counter electrode 103 to remove the adhering dust and the like.

  However, when water (treatment liquid) is supplied to the counter electrode 103, the water flow film is biased and there is a problem that the wettability of the counter electrode 103 becomes non-uniform. If the wettability is not uniform, the contact area of air and water becomes small, and as a result, the removal efficiency of the component to be treated is deteriorated.

  Further, if the supply amount of the treatment liquid is increased in order to make the wettability uniform, there arises a problem that the cost increases or a short circuit is caused between the discharge electrode and the counter electrode due to an excessive liquid amount. Therefore, an air cleaner that can make the wettability of the counter electrode uniform and reduce the amount of liquid has been desired.

  The present invention has been made in the background as described above. In particular, it is an object of the present invention to provide an air purifier that can make the wettability of the counter electrode uniform and can reduce the amount of processing liquid to be used. .

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the first invention
A discharge electrode disposed on the air flow path;
A counter electrode for collecting the component to be treated contained in the air;
A processing liquid supply means for supplying a processing liquid that absorbs the component to be processed to the counter electrode;
A processing liquid homogenizing means for preventing the processing liquid from being biased by moving the counter electrode;
The main feature is to have

  According to the first aspect of the present invention, by moving the counter electrode, the counter electrode is uniformly wetted by the processing liquid (for example, water). As a result, the contact area between the air and the treatment liquid is increased, and dust and gaseous components (for example, ammonia, acetic acid, hydrogen sulfide) contained in the air can be efficiently absorbed. Moreover, even if the amount of the treatment liquid to be used is small, the wettability becomes uniform.

The second invention also provides
A linear discharge electrode;
A counter electrode having a cylindrical shape surrounding the discharge electrode and a spiral recess formed on the inner peripheral surface;
A blowing means for blowing air so that air flows from one end to the other end of the cylindrical counter electrode;
A power source that generates a discharge by applying a voltage between the discharge electrode and the counter electrode, and collects the component to be treated contained in the air in the counter electrode;
A treatment liquid supply means for supplying a treatment liquid that absorbs the component to be treated to the inner peripheral surface of the counter electrode;
A processing liquid homogenizing means for temporarily storing the processing liquid in the concave portion by centrifugal force by rotating the counter electrode, and flowing downward from the concave portion without biasing the processing liquid;
The main feature is to have

  According to the second aspect of the present invention, the discharge electrode is linear, the counter electrode is formed in a cylindrical shape surrounding the discharge electrode, and a spiral recess is formed on the inner peripheral surface of the counter electrode. In addition, a voltage is applied between the discharge electrode and the counter electrode by the power source to generate a discharge. Further, air is circulated from one end of the counter electrode to the other end by an air circulation means (for example, a fan). Processed components such as particulate components and gaseous components contained in the air are charged by discharge and adhere to the counter electrode.

  On the other hand, a treatment liquid (for example, water) that absorbs the component to be treated is supplied to the inner peripheral surface of the counter electrode from above. Further, the counter electrode is axially rotated in a predetermined direction by a processing liquid equalizing means (for example, a motor), and this rotation generates a centrifugal force so that the processing liquid is accumulated in the recess. The treatment liquid does not stay in the recess all the time, but gradually flows out of the recess. Thereby, the inner peripheral surface of the counter electrode can be evenly wetted without the treatment liquid being biased to a predetermined portion. Also, the amount of liquid used can be reduced.

Furthermore, the third invention provides
A linear discharge electrode;
A counter electrode that is formed in a plate shape and is arranged with a plurality of predetermined intervals, with the discharge electrode positioned therebetween,
A blowing means for sending air between the discharge electrode and the counter electrode;
A power source that generates a discharge by applying a voltage between the counter electrode and the discharge electrode, and collects the component to be treated contained in the air in the counter electrode;
A processing liquid supply means for supplying a processing liquid that absorbs the component to be processed to the counter electrode;
Processing liquid homogenizing means for preventing the processing liquid from being biased by vibrating the counter electrode;
The main feature is to have

  According to the third invention, a plurality of counter electrodes are arranged in a plate shape, and a linear discharge electrode is located between the counter electrodes. A voltage is applied between the discharge electrode and the counter electrode to generate a discharge. More specifically, the counter electrodes are oriented in the vertical direction and are arranged substantially parallel to each other, and air is sent from above to below to attach dust or the like in the air to the counter electrodes. Then, a treatment liquid such as water is supplied to the side surface of the counter electrode to wet the counter electrode. The counter electrode is vibrated by a vibration device (processing liquid uniformizing means), whereby the thickness of the processing liquid is kept substantially uniform.

Moreover, this 4th invention is
A discharge electrode;
A counter electrode;
A blowing means for sending air between the discharge electrode and the counter electrode;
A power source that generates a discharge by applying a voltage between the discharge electrode and the counter electrode, and charges the component to be treated contained in the air;
A dust collecting unit that is disposed downstream of the air with respect to the discharge electrode and the counter electrode, and collects charged components to be treated;
A processing liquid supply means for supplying a processing liquid that absorbs the component to be processed to the dust collecting section;
A processing liquid homogenizing means for preventing the processing liquid from being biased by moving the dust collecting section;
The main feature is to have

  According to the fourth aspect of the invention, the discharge is generated between the discharge electrode and the counter electrode, the air is sent between the discharge electrode and the counter electrode, and the dust collecting portion is provided downstream of the air. That is, the discharge electrode and the counter electrode for charging the component to be treated in the air are arranged separately from the dust collecting portion. This improves operability. The dust collecting unit is configured as an electrode, for example, and can collect charged dust and the like by applying a voltage. Further, according to the fourth aspect of the present invention, since the processing liquid is supplied to the dust collecting portion and the dust collecting portion is moving, the wettability of the dust collecting portion can be made uniform.

Moreover, this 5th invention is in the said 4th invention,
The dust collection part is cylindrical, and a spiral recess is formed on the inner peripheral surface.
The processing liquid homogenizing means rotates the counter electrode axially, temporarily stores the processing liquid in the concave portion by centrifugal force, and causes the processing liquid to flow downward from the concave portion without being biased.

  According to the fifth aspect of the invention, the same effect as the second aspect of the invention can be obtained. In addition, since the discharge electrode and the counter electrode and the dust collecting part are separately disposed, the operability is improved.

Furthermore, this 6th invention is the said 4th invention,
The counter electrode is formed in a plate shape, a plurality of the electrodes are arranged at a predetermined interval,
The discharge electrode is located between a plurality of counter electrodes,
The processing liquid homogenizing means prevents the processing liquid from being biased by vibrating the counter electrode.

  According to the sixth invention, the same effect as that of the third invention can be obtained, and the discharge electrode, the counter electrode, and the dust collecting part are separately arranged, so that the operability is improved.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1A is a longitudinal sectional view of an air cleaner 1 according to the present invention, and FIG. 1B is a perspective view of the same. As described above, the air cleaner 1 includes the linear discharge electrode 2 and the counter electrode 3 which is configured in a cylindrical shape surrounding the discharge electrode 2 and has a spiral recess formed on the inner peripheral surface. Both ends of the counter electrode 3 are open, and the air inlet 9 is above and the air outlet 10 is below. In addition, an air circulation means (fan) (not shown) is provided to send air from the air inlet 9 to the air outlet 10.

  On the other hand, a voltage is applied between the discharge electrode 2 and the counter electrode 3 by the high voltage side power source 5a and the ground side power source 5b to generate a discharge. Due to this discharge, dust and gaseous components in the air are charged and attracted to the counter electrode 3. Further, the processing liquid 7 (for example, water) is supplied to the inner peripheral surface of the counter electrode 3 by the processing liquid supply means 4 (for example, a pump). As a result, dust or the like collected on the counter electrode 3 is removed. The treatment liquid 7 flows down along the inner peripheral surface of the counter electrode 3 and accumulates in a water tank 6 disposed below the apparatus. Thereafter, the water is drained from the drain port 11, pumped up by the processing liquid supply means 4, and supplied again to the counter electrode 3. When the apparatus is moved, the treatment liquid 7 becomes dirty, and is replaced when the level exceeds the level.

  Further, a spiral recess D is formed on the inner peripheral surface of the counter electrode 3. The counter electrode 3 is axially rotated in a predetermined direction by a motor 8 (an example of a processing liquid uniformizing unit). FIG. 2 shows an enlarged view of the counter electrode 3. Centrifugal force is generated by rotating the counter electrode 3, and the treatment liquid 7 is accumulated in the recess D in a state where the centrifugal force and gravity are balanced. Since the recess D is formed in a spiral shape, the processing liquid 7 flows downward in the recess D by gravity. Further, the centrifugal force is not so strong, and the processing liquid 7 in the recess D flows out toward the region A where the recess D is not formed on the inner peripheral surface of the counter electrode 3. ing. The outflowing treatment liquid 7 enters the lower recess D.

  As described above, the wettability of the counter electrode 3 can be made uniform. In other words, the liquid film of the treatment liquid 7 is formed in a substantially uniform thickness in the region A where the concave part D is not formed, and the liquid film flows down everywhere in the spiral concave part D, so that it gets wet evenly. As a result, the contact area between the air and the treatment liquid 7 can be increased, and the absorption efficiency of the component to be treated in the air is increased. Further, the amount of the treatment liquid 7 to be used can be reduced.

  In addition, in the air cleaner of FIG. 1, although the vertical type thing was used as the counter electrode 3, you may make it horizontal. In this case, the treatment liquid 7 moves sideways in the counter electrode 3. That is, since the spiral recess D is formed on the inner surface of the counter electrode 3, the treatment liquid 7 enters therein, and the process liquid 7 moves through the recess D as the counter electrode 3 rotates. Go out from the exit. On the way, the processing liquid 7 flows out or drops from the recess D toward the region A where the recess D is not formed, so that the inner surface of the counter electrode 3 can be uniformly wetted. The counter electrode 3 may be disposed obliquely at an angle with respect to the horizontal plane, and the treatment liquid 7 may be poured from above by rotating the counter electrode 3 so that the treatment liquid 7 flows down by gravity. Since the recess D is formed, the treatment liquid 7 can be circulated even if the counter electrode 3 is completely horizontal.

  Next, another embodiment of the present invention is shown in FIG. In the air purifier 1 of FIG. 3, a plurality of plate-like counter electrodes 3 are arranged substantially in parallel, and the linear discharge electrode 2 is positioned therebetween. A voltage is applied between the counter electrode 3 and the discharge electrode 2 to generate a discharge. On the other hand, the processing liquid 7 is supplied from the upper end of the counter electrode 3 by the processing liquid supply means 4, and the surface of the counter electrode 3 becomes wet. The counter electrode 3 is vibrated by an unillustrated vibration generator (an example of a processing liquid uniformizing means), whereby the wettability of the counter electrode 3 becomes uniform.

  Further, as shown in FIGS. 4A and 4B, a two-stage type in which the discharge electrode 2, the counter electrode 3, and the dust collecting portion 12 are separated may be used. That is, the air passes between the discharge electrode 2 and the counter electrode 3, and the component to be processed in the air is charged by the discharge, and the dust collector 12 located below the air with respect to the discharge electrode 2 and the counter electrode 3. In addition, the charged component to be treated is collected. This improves the operability of the apparatus.

  In the above embodiment, a cylindrical or plate-like electrode is used as the counter electrode 3, but these shapes are not particularly limited, and other polygonal shapes can be considered as electrode shapes. In addition, the installation form may be set vertically or horizontally. Further, the processing liquid is supplied to the counter electrode 3. However, this is not particularly limited, and spraying and dripping is performed at the front stage portion of the counter electrode, or the inner wall from the air inlet 9 or the side surface of the counter electrode 3 is used. It may be introduced directly through the injection path. Furthermore, in the said embodiment, although embodiment about the case where the counter electrode 3 was rotated and the case where it vibrates was shown, if the counter electrode 3 operate | moves and wettability will become uniform, there will be no limitation in an operation | movement form, For example, minute vibrations using ultrasonic waves or the like may be used.

  Experimental results are shown. A cylindrical electrode having a diameter of 300 mm and a length of 600 mm was used as the counter electrode, and water was supplied into the cylindrical tube to form a wet wall. Further, a linear discharge electrode was arranged in the counter electrode, and a voltage of DC 9 kV was applied to generate corona discharge. Air containing ammonia gas (60 ppm) was sent to the corona discharge, and the relationship between the ammonia gas removal performance and the amount of water was investigated.

  The result is shown in FIG. It was found that when the amount of water supplied to the counter electrode 3 was 3.7 L / min or more, the water film became substantially uniform. Then, it was found that the ammonia removal rate was proportional to the water amount up to 1.0 to 3.7 L / min, whereas the ammonia removal rate was saturated when the water amount was 3.7 L / min or more. That is, even if the amount of water is increased to 3.7 L / min or more, the removal rate does not increase, and the cost increases by the amount of increased water. This means that if a uniform liquid film can be formed, the amount of water used can be reduced and the treatment performance can be improved.

(A) longitudinal cross-sectional view (B) perspective view of an air cleaner according to the present invention Enlarged view of counter electrode 3 Another embodiment of the air purifier Both FIG. A and FIG. B are different embodiments from FIG. 1 and FIG. Experimental result Conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Discharge electrode 3 Counter electrode 4 Pump (process liquid supply means)
5a, 5b Power supply 6 Water tank 7 Treatment liquid 8 Motor (treatment liquid equalization means)
9 Air inlet 10 Air outlet 11 Drain outlet 12 Dust collector

Claims (6)

A discharge electrode disposed on the air flow path;
A counter electrode for collecting the component to be treated contained in the air;
Treatment liquid supply means for supplying a treatment liquid that absorbs the component to be treated to the counter electrode;
A treatment liquid homogenizing means for preventing the treatment liquid from being biased by moving the counter electrode;
An air purifier characterized by comprising: A linear discharge electrode;
A counter electrode having a cylindrical shape surrounding the discharge electrode and a spiral recess formed on the inner peripheral surface;
A blowing means for blowing air so that air flows from one end to the other end of the cylindrical counter electrode;
A power source that generates a discharge by applying a voltage between the discharge electrode and the counter electrode, and causes the counter electrode to collect a component to be processed contained in the air;
Treatment liquid supply means for supplying a treatment liquid that absorbs the component to be treated to the inner peripheral surface of the counter electrode;
Processing liquid homogenizing means for temporarily storing the processing liquid in the concave portion by centrifugal force by rotating the counter electrode, and flowing down the processing liquid from the concave portion without being biased;
An air purifier characterized by comprising: A linear discharge electrode;
A counter electrode that is formed in a plate shape and is disposed in a plurality at a predetermined interval, and the discharge electrode is positioned therebetween,
A blowing means for sending air between the discharge electrode and the counter electrode;
A power source that generates a discharge by applying a voltage between the counter electrode and the discharge electrode, and collects a component to be processed contained in the air in the counter electrode;
Treatment liquid supply means for supplying a treatment liquid that absorbs the component to be treated to the counter electrode;
A treatment liquid homogenizing means for preventing the treatment liquid from being biased by vibrating the counter electrode;
An air purifier characterized by comprising: A discharge electrode;
A counter electrode;
A blowing means for sending air between the discharge electrode and the counter electrode;
A power source that generates a discharge by applying a voltage between the discharge electrode and the counter electrode, and charges a component to be processed contained in the air;
A dust collecting unit that is disposed downstream of the air with respect to the discharge electrode and the counter electrode and collects the charged component to be treated;
A treatment liquid supply means for supplying a treatment liquid that absorbs the component to be treated to the dust collector;
A processing liquid homogenizing means for preventing the processing liquid from being biased by moving the dust collecting section;
An air purifier characterized by comprising: The dust collection portion is cylindrical, and a spiral recess is formed on the inner peripheral surface,
5. The processing liquid homogenizing means temporarily stores the processing liquid in the concave portion by centrifugal force by rotating the counter electrode, and causes the processing liquid to flow downward from the concave portion without being biased. Air purifier. The counter electrode is formed in a plate shape, and a plurality of sheets are arranged at a predetermined interval,
The discharge electrode is located between the plurality of counter electrodes;
The air cleaner according to claim 4, wherein the processing liquid homogenizing unit vibrates the counter electrode to prevent the processing liquid from being biased.

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