JP2021045732A - Electric dust collector and air cleaner - Google Patents

Abstract

To enhance durability, as well as, charging (electrification) performance and dust collection performance.SOLUTION: An electric dust collector 1 according to the invention for charging and collecting particles in the air by corona discharge generated by application of high voltage, comprises: a discharge electrode 30 having a bundle-shaped portion in which wire electrodes of conductive fibers are bundled; and a liquid tank 3 for storing a conductive liquid. The discharge electrode 30 is arranged at a certain space from a liquid surface of the liquid tank 3 in a posture with a tip of the discharge electrode 30 directed toward the liquid surface of the liquid tank 3.SELECTED DRAWING: Figure 3

Description

The present invention includes an electrostatic precipitator that charges and collects particles such as dust and smoke in the air and mist in oil smoke by a corona discharge generated by applying a high voltage, and an air provided with the electrostatic precipitator. Regarding cleaning equipment.

Conventionally, in order to purify air, an air purifier that sucks and purifies dust has been widely used. For example, in Patent Document 1, a linear or needle-shaped discharge electrode and a tank for storing water are arranged, and a high voltage is applied between the water and the discharge electrode to generate a corona discharge in the air. An air purifier that removes pollutants in the air is disclosed.

JP-A-2007-695

However, when a linear discharge electrode is used in the air purifier described in Patent Document 1, the wire may be broken (cut), which causes a problem in durability. In addition, when a needle-shaped discharge electrode is used, dirt adheres to the needle tip during operation, which weakens the discharge and may affect the charging performance, as well as durability. There's a problem.

Further, the air purifier described in Patent Document 1 is a so-called one-stage electrostatic precipitator that does not have a electrode plate (repulsive electrode) for collecting dust charged by a discharge electrode on the liquid surface side. Therefore, there is also a problem that it is difficult to improve the dust collection efficiency (collection efficiency).

The present invention has been made to solve the above-mentioned problems, and is an electrostatic precipitator and an air purifier capable of improving durability, charging (charging) performance, and dust collecting (collecting) performance. The purpose is to provide the device.

In order to achieve the above object, the first electrostatic precipitator of the present invention is an electrostatic precipitator that charges and collects particles in the air by a corona discharge generated by applying a high voltage, and is conductive. The discharge electrode includes a discharge electrode having a bundle-shaped portion in which wire electrodes of sex fibers are bundled, and a liquid tank for storing a conductive liquid. The discharge electrode has a tip portion of the discharge electrode of the liquid tank. It is characterized in that it is arranged at regular intervals from the liquid surface of the liquid tank in a posture toward the liquid surface.

According to the first electrostatic precipitator of the present invention, the discharge electrode has a bundle-shaped portion in which the wire electrodes are bundled, and is provided with a large number of wire electrodes as compared with a needle type or wire type electrode. Therefore, it is resistant to dirt and has excellent durability. Further, since the corona discharge can be generated at a lower voltage than the needle type or wire type electrodes, it is possible to suppress the generation of waves on the liquid surface of the liquid tank and perform stable discharge. Further, since the tip of the discharge electrode is arranged so as to face the liquid surface of the liquid tank, stable discharge can be performed between the discharge electrode and the liquid surface.

The second electrostatic precipitator of the present invention is the first electrostatic precipitator described above, wherein a liquid absorbing member made of a porous body that absorbs and holds a conductive liquid is provided in the liquid tank. The liquid absorbing member is arranged in the liquid tank so that a liquid film is formed above the liquid absorbing member.

According to the second electrostatic precipitator of the present invention, the liquid absorbing member suppresses the generation of waves on the liquid surface of the liquid tank, and stable discharge can be performed. Further, by forming a liquid film above the liquid absorbing member, stable discharge can be performed.

In the third electrostatic precipitator of the present invention, in the first or second electrostatic precipitator described above, a repulsive portion to which a high voltage is applied is provided on the downstream side of the discharge electrode in the air flow direction. The repulsive portion is provided and is characterized by including a flat portion arranged so as to face the liquid surface of the liquid tank.

The fourth electrostatic precipitator of the present invention is characterized in that, in the third electrostatic precipitator described above, the repulsive portion is arranged so as to surround the periphery of the discharge electrode.

According to the third and fourth electrostatic precipitators of the present invention, the particles charged by the discharge electrode and diffused to the downstream side of the discharge electrode are repelled by the repulsive portion to ensure that the particles are contained in the liquid in the liquid tank. Can be incorporated into.

In the fifth electrostatic precipitator of the present invention, in the above-mentioned third or fourth electrostatic precipitator, the distance between the upstream end of the repulsive portion and the discharge electrode in the air flow direction is the said. The distance between the tip of the discharge electrode and the liquid level of the liquid tank is set to be larger than the distance.

According to the fifth electrostatic precipitator of the present invention, it is possible to prevent mutual electric field interference between the discharge electrode and the repulsive portion, and prevent mutual deterioration of the performance of the discharge electrode and the repulsive portion.

The sixth electrostatic precipitator of the present invention includes a housing having an internal space in any of the first to fifth electrostatic precipitators described above, and the liquid tank is arranged in the housing. The housing is provided with a suction port at a position facing the liquid surface above the liquid tank, and air flowing into the housing from the suction port is on the downstream side of the suction port in the air flow direction. Is characterized in that an air flow path is formed so as to diffuse around the liquid tank along the liquid surface of the liquid tank.

According to the sixth electrostatic precipitator of the present invention, by changing the direction of the airflow from the descending direction to the lateral direction, the large particles contained in the air are separated from the airflow and dissolved in the liquid, so that the electric discharge is performed. Dirt on the electrode and the repulsive portion can be reduced, and durability can be improved. Further, since the air flowing in from the suction port circulates so as to diffuse from the suction port to the surrounding liquid level, the entire liquid level of the liquid tank can be effectively utilized. Further, by providing a flow passage between the housing and the liquid tank, the internal space of the housing can be effectively utilized.

In the sixth electrostatic precipitator of the present invention, the liquid tank is supported by the housing via an insulator, and the insulator is the repulsive portion in the air flow direction. It is characterized in that it is located on the downstream side of.

The eighth electrostatic precipitator of the present invention is characterized in that, in the seventh electrostatic precipitator described above, the insulator is arranged at a position retracted from the air flow passage.

According to the seventh and eighth electrostatic precipitators of the present invention, it is possible to prevent the occurrence of problems such as creeping discharge and short-circuiting of high-voltage current due to deterioration of insulating property due to adhesion of particles to the surface of the insulator. can do.

The ninth electrostatic precipitator of the present invention is any of the sixth to eighth electrostatic precipitators described above, wherein the plurality of discharge electrodes are at the downstream end of the suction port in the air flow direction. It is characterized in that it is arranged around.

According to the ninth electrostatic precipitator of the present invention, the particles flowing out from the suction port to the surroundings can be reliably charged.

The tenth electrostatic precipitator of the present invention is the ninth electrostatic precipitator described above, in which the downstream end of the suction port extends closer to the liquid surface side of the liquid tank than the tip of the discharge electrode. It is characterized by being put out.

According to the tenth electrostatic precipitator of the present invention, the air flowing in from the suction port is regulated to flow along the liquid level of the liquid tank, and does not flow toward the root of the discharge electrode. The charging performance can be improved by surely passing through the charged area.

The eleventh electrostatic precipitator of the present invention is the ninth or tenth electrostatic precipitator described above, wherein a rectifying plate having a large number of holes formed is provided in the suction port, and the openings of the holes are provided. The area is characterized in that it is formed so as to gradually increase from the central portion to the outer peripheral portion of the straightening vane.

According to the eleventh electrostatic precipitator of the present invention, the internal space of the suction port can be effectively utilized, the amount of air flowing in the central portion of the suction port is reduced, and the air on the outer peripheral portion of the suction port is reduced. The charging efficiency can be increased by increasing the distribution amount of the air.

In the twelfth electrostatic precipitator of the present invention, in any of the sixth to eighth electrostatic precipitators described above, the plurality of discharge electrodes are located between the suction port and the liquid level of the liquid tank. It is characterized by being arranged in.

According to the twelfth electrostatic precipitator of the present invention, the flow path between the suction port and the liquid level is effectively utilized, and the tip of the discharge electrode is arranged on the downstream side with respect to the air flow. The tip of the discharge electrode can be made hard to get dirty, and the durability can be improved.

The thirteenth electrostatic precipitator of the present invention is characterized in that, in the twelfth electrostatic precipitator described above, an inclined surface inclined toward the repulsive portion side is provided below the suction port. To do.

According to the thirteenth electrostatic precipitator of the present invention, the airflow flowing from the suction port to the repulsive portion can be smoothed, so that the air flow resistance can be reduced.

The fourteenth electrostatic precipitator of the present invention is any of the first to thirteenth electrostatic precipitators described above, wherein the bundled portion of the discharge electrode is a wire electrode having a diameter of 5 to 25 μm. It is characterized in that it is configured by bundling 200 pieces.

According to the fourteenth electrostatic precipitator of the present invention, the air flowability and the economic efficiency of the discharge electrode can be improved, and the durability (hard to rust) and the discharge performance (charge performance) of the discharge electrode can be improved. It can be improved.

The air purifier of the present invention is an air purifier provided with the above-mentioned first to fourth electrostatic precipitators, in which the electrostatic precipitator and the suction fan are housed inside the case, and the upper part of the case. The suction port is opened in the case, and the exhaust port is opened in the lower part of the case.

According to the fifteenth air purifying device of the present invention, the dust collection performance (collection performance) can be improved.

According to the present invention, various excellent effects such as being resistant to dirt and being able to improve durability and being able to generate a stable corona discharge at a low voltage can be obtained.

It is a perspective view which shows the electrostatic precipitator which concerns on 1st Embodiment of this invention from diagonally above. It is a perspective view which shows the inside of the electrostatic precipitator which concerns on 1st Embodiment of this invention from diagonally above. FIG. 5 is a side sectional view showing the electrostatic precipitator according to the first embodiment of the present invention cut in the left-right direction from the center position in the front-rear direction. It is a side sectional view which shows the side part of the electric dust collector which concerns on 1st Embodiment of this invention cut in the left-right direction from the center position in the front-rear direction. It is an exploded perspective view which shows the upper part of the electric dust collector which concerns on 1st Embodiment of this invention from diagonally below. It is a perspective view which shows the electrostatic precipitator which concerns on 2nd Embodiment of this invention from diagonally above. It is a perspective view which shows the main part of the electrostatic precipitator of the 2nd Embodiment of this invention from obliquely above. FIG. 5 is a side sectional view showing the electrostatic precipitator according to the second embodiment of the present invention cut from the center position in the front-rear direction in the left-right direction. It is an exploded perspective view which shows the electrostatic precipitator which concerns on 2nd Embodiment of this invention from diagonally below. It is a perspective view which shows the air purifier which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. It should be noted that each of the embodiments described below is a suitable specific example of the present invention and may be provided with various technically preferable limitations, but the technical scope of the present invention is particularly limited to the present invention. Unless otherwise specified, the present invention is not limited to these aspects.

[Electrostatic precipitator according to the first embodiment]
First, the electrostatic precipitator according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. Here, FIG. 1 is a perspective view showing the electrostatic precipitator according to the first embodiment from diagonally above, and FIG. 2 is a perspective view showing the inside of the electrostatic precipitator according to the first embodiment from diagonally above. 3 is a side sectional view showing the electrostatic precipitator according to the first embodiment cut in the left-right direction from the center position in the front-rear direction, and FIG. 4 is a side portion of the electrostatic precipitator according to the first embodiment. A side sectional view shown by cutting from the center position in the front-rear direction in the left-right direction, FIG. 5 is an exploded perspective view showing the upper part of the electrostatic precipitator according to the first embodiment from diagonally below.

In the following description, for convenience of explanation, the orientation in each figure is set with reference to the front-back, left-right, and up-down orientations indicated by the arrows in FIG. In addition, "flow direction" refers to the direction in which air flows, and "upstream" and "downstream" and similar terms refer to "upstream" and "downstream" in the air flow direction and similar concepts. And.

The electrostatic precipitator 1 according to the first embodiment is a device that charges and collects particles in the air by corona discharge, and includes a housing 2, a liquid tank 3, a discharge unit 4, and an insulator for power supply. The insulator 5 and the support insulator 6 and the high-voltage power supply unit 7 are provided. The housing 2 is a ground electrode connected to a reference potential point (for example, the ground or the like). The liquid tank 3 is provided inside the housing 2 and is supported by the housing 2 via the power feeding insulator 5 and the supporting insulator 6. The discharge unit 4 includes a discharge electrode 30 that generates a corona discharge with the liquid surface of the liquid tank 3.

<Case>
The housing 2 is formed in a flat rectangular parallelepiped shape having a space inside. A rectangular top plate 11 is fixed to the upper surface of the housing 2. The top plate 11 is detachably provided on the housing 2 with a total of eight screws 12 via the bent portions 8 formed on the upper edges of the side surfaces 2a, 2b, 2c, and 2d of the housing 2. There is. A rectangular rising portion 13 is formed in the central portion of the top plate 11 in a plan view. A suction port 15 is fixed and a rectangular opening 14 is formed inside the rising portion 13. Has been done.

The suction port 15 has an upper portion 16 formed in a rectangular tubular shape along the inner surface of the rising portion 13, and a lower portion 18 formed in a rectangular tubular shape via an inclined portion 17 inclined downward and inward from the upper portion 16. The lower portion 18 is formed to have a smaller diameter than the upper portion 16. A suction port duct 51 is connected to the upper portion 16 of the suction port 15.

Inside the upper portion 16 of the suction port 15, a straightening vane 9 is provided in a horizontal posture in a direction that blocks the flow of air. A large number of holes 19 are formed in the straightening vane 9, and the opening area of the holes 19 is set so as to gradually increase from the central portion to the outer peripheral portion. As a result, the internal space of the suction port 15 can be effectively utilized, the amount of air flowing in the central portion of the suction port 15 is reduced, and the amount of air flowing in the outer peripheral portion of the suction port 15 is increased. , The charging efficiency can be increased.

Below the top plate 11, a rectangular base plate 21 smaller than the top plate 11 is fixed via a total of four spacers 20. A rising portion 22 is formed in the central portion of the base plate 21 at a position corresponding to the rising portion 13 of the top plate 11. The upper end of the rising portion 22 is in contact with the lower surface of the top plate 11, and an opening 23 having the same shape as the opening 14 is formed inside the rising portion 22 at a position corresponding to the opening 14.

A rectangular annular support fixing member 24 is formed on the lower surface of the base plate 21 at a position facing the opening 23, and is rectangular so as to surround the support fixing member 24 on the radial outer side of the support fixing member 24. An annular repulsion portion 25 is formed. The support fixing member 24 has a U-shaped cross section with an open upper surface, and the inner surface 24a of the support fixing member 24 forms the same surface as the inner surfaces of the rising portions 13 and 22. ing.

The repulsion portion 25 has a U-shaped cross section with an open upper surface, and is arranged outside the support fixing member 24 at a predetermined distance X (see FIG. 4). The repulsive portion 25 has a length larger than that of the support fixing member 24 in both the radial direction and the vertical direction, and a conductive flat surface portion 26 is formed on the lower surface of the repulsive portion 25.

A rectangular exhaust port 50 is formed on the lower surface of the housing 2. The opening area of the exhaust port 50 is set to be larger than the opening area of the suction port 15 in order to prevent a decrease in pressure loss in the air flow passage 27. An exhaust duct 52 is connected to the exhaust port 50, and a suction fan (not shown) is provided in the exhaust duct 52. In the present embodiment, the suction port duct 51 and the exhaust port 52 are connected to the suction port 15 and the exhaust port 50, respectively, but suction is performed from the periphery of the exhaust port 50 without using the ducts 51 and 52. Then, it may be exhausted around the exhaust port 50.

<Liquid tank>
The liquid tank 3 is formed in a flat rectangular parallelepiped shape with an open upper surface, and is housed inside the housing 2. The liquid tank 3 is supported by the housing 2 via a power supply insulator 5 and a support insulator 6, and an air flow passage 27 is formed around the liquid tank 3. A conductive liquid 28 (for example, water) is stored in the liquid tank 3. The liquid stored in the liquid tank 3 may be a liquid having a bactericidal component or a deodorant component that sterilizes a virus or the like.

A liquid absorbing member 29 made of a porous body having absorbency (water absorption) is provided in the liquid tank 3. Here, the porous body means a material in which a space (gap between fibers, foaming, etc.) is formed in the material so that the liquid permeates, and specifically, a foaming material, a sponge, or a gel. It may be made of metal or metal. The liquid absorbing member 29 is arranged near the liquid surface of the liquid tank 3, and the liquid that has soaked into the liquid absorbing member 29 forms a liquid film of, for example, 0.5 mm or less on the upper surface of the liquid. ..

Further, a liquid absorbing member support (not shown) for supporting the liquid absorbing member 29 from below is provided in the liquid tank 3, whereby the liquid absorbing member 29 is held at a predetermined position in the liquid tank 3. Will be done. The liquid absorbing member support is formed of, for example, a mesh-shaped wire mesh or a plate-shaped punching metal.

A liquid supply means (not shown) for supplying the liquid and a liquid discharge means (not shown) for discharging the dirty liquid in the liquid tank 3 may be provided in the liquid tank 3. For example, a liquid pump and a filter may be used to circulate and supply the liquid into the liquid tank 3. Further, when the liquid is water, a water pipe may be connected to the liquid tank 3 so that clean water is always supplied into the liquid tank 3.

<Discharge part>
As is well shown in FIG. 4, the discharge unit 4 includes a plurality of discharge electrodes 30 and a support 31 that supports each discharge electrode 30. Each discharge electrode 30 includes a bundle-shaped portion 33 formed by bundling fibrous wire electrodes 32 in a brush shape. The wire electrode 32 is made of non-magnetic stainless steel fiber having a diameter of 12 μm. Therefore, the wire electrode 32 is easily separated from the bundled portion 33, and the discharge performance can be improved. For example, in a ferrite system having magnetism, since the wire electrode 32 is harder to separate from the bundled portion 33, it is difficult to generate a strong electric field corona discharge due to the large influence of electric field interference with the bundled portion 33. One discharge electrode 30 is formed by, for example, bundling about 100 wire electrodes 32. The discharge electrode 30 may be formed by bundling 10 to 200 wire electrodes 32 having a diameter of 5 to 25 μm.

The voltage applied to the discharge electrode 30 is in the range of 4 to 6 kV, and the length of the discharge electrode 30 is in the range of 3 to 7 mm. Therefore, stable discharge can be performed even at a relatively low voltage. Further, a high voltage negative with direct current is applied to the discharge electrode 30. By adopting the DC method in this way, a relatively simple configuration can be obtained as compared with other methods (AC, pulse). Further, by adopting the negative charge method, a large amount of discharge current can be passed through the discharge electrode 30 even in the same space (gap) as compared with the positive charge method. Further, the discharge stability (characteristic that abnormal discharge is unlikely to occur) can be improved as compared with the positive charge method.

The support 31 is made of stainless steel (SUS304) and uses the same material as the wire electrode 32. By using the same material (stainless steel) for the wire electrode 32 and the support 31 fixed to the support 31, electrolytic corrosion (electrolytic corrosion) due to contact between dissimilar metals is prevented.

The support 31 is fixed in two rows on both sides of the inner surface 24a and the outer surface 24b of the support fixing member 24 in the circumferential direction. As a result, the plurality of discharge electrodes 30 are arranged around the suction port 15, and the charge efficiency can be improved by arranging the supports 31 in two rows.

The plurality of discharge electrodes 30 are provided so as to extend downward from the support 31 toward the liquid surface of the liquid tank 3. The plurality of discharge electrodes 30 are all formed to have substantially the same overall length, and the tips of the plurality of discharge electrodes 30 are substantially aligned. The plurality of discharge electrodes 30 are intermittently provided at a predetermined pitch along the circumferential direction of the support 31.

The distance Y between the tip end (lower end) of the discharge electrode 30 and the liquid level of the liquid tank 3 is set to the same distance as the distance between the flat surface portion 26 of the repulsion portion 25 and the liquid level of the liquid tank 3. For example, in each case, the applied voltage is set to several KV and ten and several mm. In order to improve the collection performance (collection efficiency), the distance between the repulsive portion 25 and the liquid level of the liquid tank 3 is closer than the distance Y between the tip of the discharge electrode 30 and the liquid level of the liquid tank 3. May be set.

The distance X between the inner surface 25a of the repulsion portion 25 and the outer discharge electrode 30 is larger than the distance Y (discharge distance) between the tip (lower end) of the discharge electrode 30 and the liquid surface of the liquid tank 3. It is set. This makes it possible to prevent electric field interference.

Further, the lower end portion of the suction port 15 extends toward the liquid surface side from the tip end portion (lower end portion) of the discharge electrode 30. As a result, the air flowing in from the suction port 15 is guided to flow along the liquid surface of the liquid tank 3 when it flows out from the suction port 15, so that the air does not flow to the root portion (upper part) of the discharge electrode 30. Therefore, the charging performance can be improved because the charging area is surely passed. Further, as described above, since the suction port 15 is formed so as to be separated from the discharge electrode 30 by the inclined portion 17 of the suction port 15, it is possible to prevent electric field interference. The distance between the lower portion 18 of the suction port 15 and the inner discharge electrode 30 is set to be the same as the distance X between the inner surface 25a of the repulsion portion 25 and the outer discharge electrode 30. This makes it possible to prevent electric field interference.

<Power supply insulator and support insulator>
One power supply insulator 5 and three support insulators 6 are provided between the side surface of the housing 2 and the side surface of the liquid tank 3. The power feeding insulator 5 and the supporting insulator 6 are made of, for example, porcelain or pottery or a resin having excellent electrical insulation.

The power supply insulator 5 includes a insulator main body 34 interposed between one side surface 2a of the housing 2 and one side surface 3a of the liquid tank 3, and a power supply connection portion 35 provided on the outside of one side surface 2a of the housing 2. And have. The insulator main body 34 is formed in a substantially cylindrical shape, and a through hole 38a is formed in the axial center of the insulator main body 34.

The power supply connecting portion 35 is composed of a disk-shaped flange portion 37 and a cylindrical recess 36 that is concentric with the flange portion 37 and has a diameter smaller than that of the collar portion 37. A through hole 38b is formed in the axial center of the collar portion 37 so as to communicate with the through hole 38a of the insulator main body 34. By fastening the nut 40 to the power feeding screw 39 inserted into the through hole 38b of the collar portion 37 and the through hole 38a of the insulator body 34, the insulator body 34 becomes one side surface 2a of the housing 2 and one side surface of the liquid tank 3. It is fixed between 3a and 3a.

A plurality of (4 in the drawing) fixing holes are formed at equal intervals in the circumferential direction on the outer peripheral portion of the flange portion 37, and the nut 42 is fastened to the fixing screw 41 inserted through these fixing holes. As a result, the power supply connection portion 35 is fixed to one side surface 2a of the housing 2. The power supply spring 43 is provided in the recess 36 of the power supply connection portion 35 so as to be in electrical contact with the power supply screw 39, and the power supply spring 43 is in electrical contact with the high voltage power supply unit 7.

The support insulator 6 is provided between the other three side surfaces 2b, 2c, 2d other than the one side surface 2a of the housing 2 and the other three side surfaces 3b, 3c, 3d other than the one side surface 3a of the liquid tank 3, respectively. It is an insulator. Through grooves 44a and 44b are formed on the axis of the support insulator 6 from the inside and the outside, respectively. By fastening the fixing screws 45 to the through grooves 44a and 44b from the inside and outside of the support insulator 6, the support insulator 6 has three side surfaces 2b, 2c, 2d of the housing 2 and three liquid tanks 3. It is fixed between the side surfaces 3b, 3c, and 3d, respectively.

<High voltage power supply>
As shown in FIG. 3, the voltage power supply unit 7 includes a high-voltage transformer 46, a booster unit 47, and a limit switch 48. The high voltage power supply unit 7 applies a high voltage to the liquid tank 3 side via the power feeding insulator 5. The high-voltage transformer 46 boosts the AC voltage of the main power source P (AC 100V). The booster section 47 converts the AC voltage boosted by the high-voltage transformer 46 into a DC voltage, and further boosts the voltage to generate a high voltage of about -5 kV. The booster 47 also functions as an output control unit that controls the application of a high voltage to the discharge electrode 30. The limit switch 48 is in the ON state (ON state) when the electrostatic precipitator 1 is attached to the air purifier 100 described later, and is in the open state (OFF state) when the electrostatic precipitator 1 is separated from the air purifier 100. Become.

If the dust collection method is a positive charge method, the discharge distance must be shortened in order to secure the discharge current required for charging, and abnormal discharge is likely to occur. Therefore, in the above-described embodiment, the negative charge method is adopted in consideration of the large discharge current even at the same space interval (gap) and the discharge stability (tendency to prevent abnormal discharge). A direct current power source (for example, 24V) may be used.

<Air flow path>
As shown by arrows in FIGS. 3 and 4, after the air flowing in from the central suction port 15 and descending is diffused outward along the liquid surface of the liquid tank 3 inside the electrostatic precipitator 1. The exhaust port 50 passes between the side surfaces 2a, 2b, 2c, 2d of the housing 2 and the side surfaces 3a, 3b, 3c, 3d of the liquid tank 3, and between the lower surface of the housing 2 and the lower surface of the liquid tank 3. An air flow passage 27 is formed so as to discharge the air from the air to the outside. In the present embodiment, the air flow passage 27 is formed so that air is sucked into the inside from the upper part of the electrostatic precipitator 1 and exhausted from the lower part, but the air flow may be reversed. In that case, the arrangement of the discharge electrode 30 and the repulsion portion 25 is also reversed.

[Action of electrostatic precipitator]
Next, the operation of the electrostatic precipitator 1 will be described with reference to FIGS. 3 and 4. Dust-containing air containing particles such as dust, smoke, and mist in oil smoke generated outside the electrostatic precipitator 1 is sucked into the suction port 15 by the suction force of the suction fan and is downdraft (downflow). Then, it flows into the liquid tank 3 from the lower portion 18 of the suction port 15.

At this time, since the opening area of the hole 19 of the straightening vane 9 in the suction port 15 is set to gradually increase from the central portion to the outer peripheral portion, the internal space of the suction port 15 should be effectively utilized. At the same time, the amount of air flowing in the central portion of the suction port 15 can be reduced, and the amount of air flowing in the outer peripheral portion of the suction port 15 can be increased. As a result, the air flowing into the liquid tank 3 from the suction port 15 does not directly collide with the liquid surface of the liquid tank 3 or the liquid surface does not undulate, and the discharge electrode 30 is arranged. Since air can be guided in the outer peripheral direction of the suction port 15, the charging efficiency can be improved.

Since the inner diameter of the liquid tank 3 is larger than the inner diameter of the suction port 15 for the dust-containing air that has flowed into the liquid tank 3 from the suction port 15 in this way, the circumference of the suction port 15 is along the liquid surface of the liquid tank 3. It diffuses into the air and passes between the discharge electrode 30 and the liquid surface of the liquid tank 3. At this time, as is well shown in FIG. 4, by changing the direction of the air flow of the dust-containing air from the descending direction to the lateral direction, the large particles contained in the dust-containing air are separated from the air flow and the liquid is released. It dissolves in the liquid 28 in the tank 3.

During this time, a high voltage is applied from the high voltage power supply unit 7 to the liquid tank 3 side via the power supply insulator 5, so that the wire electrode 32 separated from the bundled portion 33 becomes a strong electric field, and the tip portion of the wire electrode 32 becomes a strong electric field. A corona discharge is generated between the liquid tank 3 and the liquid tank 3. In the corona discharge, a substantially conical charging area EA is formed between the tip of each discharge electrode 30 and the liquid surface of the liquid tank 3, and small particles in the air flowing through the charging area EA are charged. The charged particles are attracted to the liquid surface of the liquid tank 3 and adsorbed, and are collected in the liquid of the liquid tank 3.

The dust-containing air that has passed between the discharge electrode 30 and the liquid level of the liquid tank 3 passes between the flat surface portion 26 of the repulsion portion 25 and the liquid level of the liquid tank 3. During this time, the small charged particles in the dust-containing air repel from the flat surface portion 26 of the repulsion portion 25, are attracted to the liquid surface side of the liquid tank 3, and are collected in the liquid of the liquid tank 3.

The clean air from which the particles have been removed by passing between the repulsive portion 25 and the liquid surface of the liquid tank 3 rises once from the outer peripheral portion of the liquid tank 3 and then descends, and the side surfaces 2a, 2b, 2c of the housing 2 , 2d and the side surfaces 3a, 3b, 3c, 3d of the liquid tank 3, and between the lower surface of the housing 2 and the lower surface of the liquid tank 3, and is discharged to the outside from the exhaust port 50.

At this time, the power supply insulator 5 and the support insulator 6 are in the regions (side surfaces 2a, 2b, 2c, 2d of the housing 2 and the liquid tank 3) in which the clean air on the downstream side of the repulsion portion 25 flows in the air flow direction. Since it is provided on each of the side surfaces 3a, 3b, 3c, and 3d), the insulator surface is contaminated with particles, which reduces the insulating property and causes problems such as creeping discharge and short-circuiting of high-voltage current. Can be prevented.

[Electrostatic precipitator according to the second embodiment]
Next, the electrostatic precipitator according to the second embodiment of the present invention will be described with reference to FIGS. 6 to 9. Here, FIG. 6 is a perspective view showing the electrostatic precipitator according to the second embodiment from diagonally above, and FIG. 7 is a perspective view showing the main part of the electrostatic precipitator according to the second embodiment from diagonally above. 8 is a side sectional view showing the electrostatic precipitator according to the second embodiment cut in the left-right direction from the center position in the front-rear direction, and FIG. 9 shows the electrostatic precipitator according to the second embodiment from diagonally below. It is an exploded perspective view. In the following description, detailed description of the same configuration as that of the electrostatic precipitator 1 according to the first embodiment described above will be omitted.

The electrostatic precipitator 61 according to the second embodiment is a device that charges and collects particles in the air by corona discharge, and includes a housing 62, a liquid tank 63, a discharge unit 64, and a power supply insulator. It includes 65, a support insulator 66, and a high-voltage power supply unit 7 (see FIG. 3).

<Case>
The housing 62 is a ground electrode connected to a reference potential point (for example, the ground or the like), and is formed in a flat rectangular parallelepiped shape having a space inside. A rectangular top plate 67 is provided on the upper surface of the housing 62, and a rectangular suction port 68 is formed in the central portion of the top plate 67. A rectangular frame-shaped spacer 69 is provided below the top plate 67, and the top plate 67 is detachably fixed to the spacer 69 via four screws 70. An opening 71 having the same shape as the suction port 68 is formed in the central portion of the spacer 69.

Below the top plate 67, a rectangular base plate 72 smaller than the top plate 11 is provided. A rising portion 73 is formed in the central portion of the base plate 72. The rising portion 73 is composed of a vertical wall portion 73a and an upper surface portion 73b extending from the upper end of the wall portion 73a toward the center.

Two shafts 84 are provided between both ends of the wall portions 73a of the rising portions 73 facing each other. Screws 85 for fixing to the wall portion 73a are screwed at both ends of each shaft 84. Further, fixing holes 74 are formed at four locations on the upper surface portion 73b of the rising portion 73, and the spacer 69 is fixed to the upper surface portion 73b using the fixing holes 74. An opening 75 having the same shape as the suction port 68 is formed in the central portion of the base plate 72.

A repulsive portion 76 is formed in a rectangular annular shape on the outer peripheral side of the rising portion 73 of the base plate 72. The repulsion portion 76 has a plate shape, and vertical bent portions 77a, 77b, 77c, and 77d are formed at four positions on each side of the outer peripheral edge portion of the repulsion portion 76, respectively. One bent portion 77a and one side surface 62a of the housing 62 are fixed by one power supply insulator 65, and the other three bent portions 77b, 77c, 77d and the other three side surfaces 62b, 62c of the housing 62, The 62d is fixed by three support insulators 66, respectively.

Further, below the suction port 68 of the base plate 72, an inclined surface 72a is formed toward the repulsion portion 76. As a result, the airflow flowing from the suction port 68 into the repulsion portion 76 can be smoothed, and the air flow resistance can be reduced.

A rectangular exhaust port 78 is formed on the lower surface of the housing 62. In order to prevent a decrease in pressure loss in the air flow passage 79, the opening area of the exhaust port 78 is set to be larger than the opening area of the suction port 68. An exhaust duct 59 is connected to the exhaust port 78, and a suction fan (not shown) is provided in the exhaust duct 59. Further, on the lower surface of the housing 62, fixing portions 80 are projected at the four corners of the exhaust port 78, respectively.

<Liquid tank>
The liquid tank 63 is formed in a flat rectangular parallelepiped shape with an open upper surface. The liquid tank 63 is fixed to each fixing portion 80 inside the housing 62, and an air flow passage 79 is formed around the liquid tank 3.

The liquid tank 63 contains a liquid absorbing member 81 made of a porous body in which a conductive liquid has penetrated. The size of the liquid absorbing member 81 is set so as to be accommodated in the liquid tank 63 without a gap, and for example, 0 is placed on the upper surface of the liquid absorbing member 81 in a state where the liquid absorbing member 81 is accommodated in the liquid tank 63. A liquid film of .5 mm or less is formed.

Since the liquid absorbing member 81 adsorbs dirt with the lapse of operating time, it gradually becomes dirty. In that case, the dirty liquid absorbing member 81 may be taken out from the liquid tank 63 and washed or replaced. Just do it. Therefore, the equipment for draining the sewage in the liquid tank 63 is not required, which is excellent in economy.

<Discharge part>
The discharge unit 64 includes a plurality of discharge electrodes 82 and a plurality of supports 83 that support each discharge electrode 82. Since the configuration of the discharge electrode 82 is the same as that of the discharge electrode 30 of the first embodiment described above, detailed description thereof will be omitted.

Holes are formed at both ends of each support 83, and the shaft 84 penetrates the holes at both ends so that each support 83 crosses the opening of the suction port 68 in a plurality of rows (in the present embodiment). It is supported by the shaft 84 over 10 rows). A tubular conductive collar 87 having an outer diameter slightly larger than that of the shaft 84 is provided on the outer periphery of the shaft 84, and the collar 87 maintains a predetermined interval between the supports 83. The collar 87 is a long collar 87a interposed between the wall portion 73a of the rising portion 73 and the support 83 on both ends of the shaft 84, and a short collar interposed between the adjacent supports 83. 87b and.

<Power supply insulator and support insulator>
The power supply insulator 65 includes an insulator main body 88 interposed at a position retracted from an air flow passage 79 between one bent portion 77a and one side surface 62a of the housing 62, and one side surface 62a of the housing 62. It is provided with a power supply connection portion 89 provided on the outside. The insulator main body 88 is formed in a substantially cylindrical shape, and a through hole 90 is formed in the axial center of the insulator main body 88.

The power supply connecting portion 89 is composed of a flat plate-shaped flange portion 91 and a cylindrical recess 92 projecting from the flange portion 91. A through hole 93 is formed in the axial center of the collar portion 91 so as to communicate with the through hole 90 of the insulator main body 88. By fastening the nut 95 to the through hole 93 of the collar portion 91 and the power feeding screw 94 inserted into the through hole 90 of the insulator body 88, the insulator body 88 is fixed between the bent portion 77a and the housing 62. It has become like.

By fastening a plurality of (two in the drawing) fixing screws 96 to the collar portion 91, the power supply connecting portion 89 is fixed to one side surface 62a of the housing 62. A power supply spring 97 is provided in the recess 92 of the power supply connection portion 89 so as to electrically contact the power supply screw 94, and the power supply spring 97 electrically contacts the high voltage power supply unit 7 (see FIG. 3). are doing. Since the configuration of the high voltage power supply unit 7 is the same as that of the first embodiment described above, detailed description thereof will be omitted.

The support insulator 66 has the bent portions 77b, 77c, 77d and the side surfaces 62b of the housing 62 by fastening the fixing screws 99 to the through grooves 98a and 98b formed in the axial centers from the inside and the outside, respectively. It is fixed at a position retracted from the air flow passage 79 between 62c and 62d, respectively.

<Air flow path>
As shown by an arrow in FIG. 8, inside the electrostatic precipitator 61, the air flowing in from the central suction port 68 and descending passes through the discharge unit 64 and goes outward along the liquid surface of the liquid tank 63. After diffusion, it passes between the side surfaces 62a, 62b, 62c, 62d of the housing 2 and the side surfaces 63a, 63b, 63c, 63d of the liquid tank 3, and between the lower surface of the housing 2 and the lower surface of the liquid tank 63. An air flow passage 79 is formed so as to discharge the air from the exhaust port 78 to the outside.

[Action of electrostatic precipitator]
Next, the operation of the electrostatic precipitator 61 will be described. Dust-containing air containing particles such as dust, smoke, and mist in oily smoke generated outside the electrostatic precipitator 61 is sucked into the suction port 68 by the suction force of the suction fan, resulting in a downdraft. Then, it passes through the discharge unit 64 below the suction port 68.

The dust-containing air that has passed through the discharge section 64 diffuses around the discharge section 64 along the liquid level of the liquid tank 63 while passing between the discharge electrode 82 and the liquid level of the liquid tank 63. During this time, a high voltage is applied from the high-voltage power supply unit 7 to the discharge electrode 82 via the power supply porcelain 65, so that a corona discharge is generated between the tip of the discharge electrode 82 and the liquid tank 63. .. Due to the corona discharge, a charged area is formed between the tip of each discharge electrode 82 and the liquid surface of the liquid tank 63, and the particles in the air flowing through the charged area are charged. The charged particles are attracted to the liquid surface of the liquid tank 63 and adsorbed, and are collected in the liquid in the liquid absorbing member 81 of the liquid tank 63.

The dust-containing air that has passed between the discharge electrode 82 and the liquid level of the liquid tank 63 passes between the repulsive portion 76 and the liquid level of the liquid tank 63. During this time, the particles in the dust-containing air are repelled from the repulsive portion 76, are attracted to the liquid surface side of the liquid tank 63, and are collected in the liquid in the liquid absorbing member 81 of the liquid tank 63.

The clean air from which the particles have been removed by passing between the repulsive portion 76 and the liquid surface of the liquid tank 63 is the side surfaces 62a, 62b, 62c, 62d of the housing 62 and the side surfaces 63a, 63b, 63c of the liquid tank 63. It passes between 63d and between the lower surface of the housing 62 and the lower surface of the liquid tank 63, and is discharged to the outside from the exhaust port 78.

At this time, the power supply insulator 65 and the support insulator 66 are regions in which clean air flows on the downstream side of the repulsion portion 76 in the air flow direction, and are provided at positions retracted from the air flow passage 79, respectively. Therefore, it is possible to prevent problems such as creeping discharge and short-circuiting of high-voltage current due to deterioration of the insulating property due to the adhesion of particles to the surface of the insulator.

[Modified example of electrostatic precipitator according to the first and second embodiments]
The electrostatic precipitators 1 and 61 according to the first and second embodiments described above are formed in a flat rectangular parallelepiped shape, but may have other shapes such as a circular shape and a polygonal shape.

Further, the installation positions of the suction ports 15 and 68 and the exhaust ports 50 and 78 and the routes of the air flow passages 27 and 79 are not necessarily limited to the above-described embodiment, and for example, the suction ports 15 and 68 are used. The top plates 11 and 67 are provided close to one side, and the exhaust ports 50 and 78 are provided on the other side of the housings 2 and 62 to form an air flow path so that air can flow in one direction. It is also possible to do. In that case, the repulsive portions 25 and 76 are arranged on the downstream side of the discharge electrodes 30 and 82 without being provided so as to surround the discharge electrodes 30 and 82.

[Air purifier]
Next, the air purifier according to the embodiment of the present invention will be described with reference to FIG. Here, FIG. 10 is a perspective view showing a state in which the cover on the front side of the air purifier according to the embodiment of the present invention is removed.

The air purifier 100 includes a horizontal rectangular table 101, a rectangular parallelepiped case 102 provided below the table 101, casters 103 provided at four corners of the lower surface of the case 102, an operation unit (not shown), and an operation unit (not shown). It has. A rectangular top plate 104 is detachably provided in the central portion of the table 101, and a suction port 105 is formed in the top plate 104.

A storage space for the electrostatic precipitators 1,61 is provided in the upper part of the case 102, and when the electrostatic precipitators 1,61 are stored in the storage space, a power supply spring 43 for the electrostatic precipitators 1,61 is provided. (See FIG. 3 and the like) and 97 (see FIG. 8 and the like) are in electrical contact with the power feeding unit (not shown) of the air purifier 100. Further, in the upper part of the case 102, a storage space 106 such as a high voltage power supply unit and a control unit is provided on the side of the storage space.

The case 102 is provided with a suction fan portion 107 for accommodating a suction fan (not shown) below the storage space of the electrostatic precipitators 1 and 61, and a deodorizing portion (not shown) for accommodating activated carbon on the downstream side of the suction fan. (Not shown) is provided. An exhaust port 108 is formed in the lower part of the case 102.

In the air purifier 100 in which the electrostatic precipitators 1,61 are housed in this way, when the operation switch of the operation unit is pressed, a high voltage of the electrostatic precipitators 1,61 is applied via the power feeding unit. Then, the suction fan is driven. As a result, the dust-containing air containing particles such as dirty smoke in the room flows into the air purifier 100 from the suction port 105, and the particles in the dust-containing air are collected by the electrostatic precipitators 1 and 61. After that, it becomes clean air and is returned to the room through the exhaust port 108.

The technique of the present invention can be used for an electrostatic precipitator or an air purifier that collects dirty particles in the air (particles such as cigarette smoke, pollen, mist in oil smoke during cooking, etc.) indoors. it can.

1 Electrostatic precipitator 2 Housing 3 Liquid tank 5 Power supply porcelain 6 Support porcelain 9 Suction plate 16 Suction port 19 Hole 25 Repulsion part 26 Flat part 27 Air flow path 28 Liquid 29 Liquid suction member 30 Discharge electrode 32 Wire electrode 33 Bundled part 61 Electrostatic precipitator 62 Housing 63 Liquid tank 65 Power supply porcelain 66 Supporting porcelain 68 Suction port 72a Inclined surface 76 Repulsion part 79 Air flow path 100 Air purifier 102 Case 105 Suction port 108 Exhaust mouth

Claims (15)

An electrostatic precipitator that charges and collects particles in the air by corona discharge generated by applying a high voltage.
A discharge electrode having a bundle-shaped portion in which conductive fiber wire electrodes are bundled,
A liquid tank that stores conductive liquid and
With
The electric discharge electrode is arranged with the tip of the discharge electrode facing the liquid surface of the liquid tank at regular intervals from the liquid surface of the liquid tank. Dust collector. A liquid absorbing member made of a porous body that absorbs and holds a conductive liquid is provided in the liquid tank, and the liquid absorbing member has a liquid film formed above the liquid absorbing member. The electrostatic precipitator according to claim 1, wherein the electrostatic precipitator is arranged in the liquid tank. A repulsive portion to which a high voltage is applied is provided on the downstream side of the discharge electrode in the air flow direction, and the repulsive portion includes a flat surface portion arranged so as to face the liquid surface of the liquid tank. The electrostatic precipitator according to claim 1 or 2, wherein the electrostatic precipitator is characterized by the above. The electrostatic precipitator according to claim 3, wherein the repulsive portion is arranged so as to surround the periphery of the discharge electrode. The distance between the upstream end of the repulsion portion and the discharge electrode in the air flow direction is set to be larger than the distance between the tip of the discharge electrode and the liquid level of the liquid tank. The electrostatic precipitator according to claim 3 or 4. A housing having a space inside is provided, and the liquid tank is arranged in the housing, and the housing is provided with a suction port at a position facing the liquid surface above the liquid tank, and an air flow direction is provided. On the downstream side of the suction port, an air flow passage is formed so that the air flowing into the housing from the suction port diffuses around the liquid tank along the liquid surface of the liquid tank. The electrostatic precipitator according to any one of claims 1 to 5, wherein the electrostatic precipitator is characterized. The electrostatic precipitator according to claim 6, wherein the liquid tank is supported by the housing via an insulator, and the insulator is arranged on the downstream side of the repulsive portion in the air flow direction. .. The electrostatic precipitator according to claim 7, wherein the insulator is arranged at a position retracted from the air flow passage. The electrostatic precipitator according to any one of claims 6 to 8, wherein the plurality of discharge electrodes are arranged around a downstream end portion of the suction port in the air flow direction. apparatus. The electrostatic precipitator according to claim 9, wherein the downstream end of the suction port extends toward the liquid surface side of the liquid tank from the tip of the discharge electrode. The suction port is provided with a rectifying plate having a large number of holes formed therein, and the opening area of the holes is formed so as to gradually increase from the central portion to the outer peripheral portion of the rectifying plate. The electrostatic precipitator according to claim 9 or 10. The electrostatic precipitator according to any one of claims 6 to 8, wherein the plurality of discharge electrodes are arranged between the suction port and the liquid level of the liquid tank. The electrostatic precipitator according to claim 12, wherein an inclined surface inclined toward the repulsive portion side is provided below the suction port. The electrical collection according to any one of claims 1 to 13, wherein the bundled portion of the discharge electrode is formed by bundling 10 to 200 wire electrodes having a diameter of 5 to 25 μm. Dust device. An air purifier including the electrostatic precipitator according to any one of claims 1 to 14.
An air purifying device characterized in that the electrostatic precipitator and a suction fan are housed inside the case, a suction port is opened in the upper part of the case, and an exhaust port is opened in the lower part of the case.

Images