JP2017131875A - Electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric dust collector capable of providing the high dust collection effect.SOLUTION: An electric dust collector 10 comprises a duct 11 for forming a flow passage of flowing in the predetermined direction and a discharge electrode 13a used for discharge for electrifying dust included in air in the flow passage. The electric dust collector 10 also comprises a first plate-like electrode 14 for collecting the dust electrified by the discharge, and the first plate-like electrode 14 comprises a plurality of openings 14a arranged in the flow passage so that a main surface crosses with the predetermined direction and passing the air in the flow passage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrostatic precipitator that collects dust contained in air.

  2. Description of the Related Art Conventionally, there is known a dust collector that charges particles such as fine particulate matter floating in a gas such as room air and collects the charged particles by a dust collecting electrode to which a voltage is applied (for example, Patent Document 1).

  In the dust collector described in Patent Document 1, the particles introduced into the dust collector by a fan are charged and electrically attracted to the dust collection electrode, so that the fine particles are difficult to collect with an air filter or the like. Can be collected relatively efficiently.

JP-A-6-254437

  By the way, in the vacuum cleaner as described above, there is a case where a sufficient dust collection effect cannot be obtained, for example, when the particles are not sufficiently charged.

  The present invention provides an electric dust collector capable of obtaining a high dust collection effect.

  An electrostatic precipitator according to an aspect of the present invention includes a structure having an air inlet and an air outlet and forming a flow path in which air flows in a predetermined direction from the air inlet to the air outlet. An electrode used for discharge for charging dust contained in the air, and a plate-like electrode for collecting the dust charged by the discharge, the main surface of the plate-like electrode being in the predetermined direction It arrange | positions in the said flow path so that it may cross | intersect, and has several opening for letting the air in the said flow path pass.

  According to the electric dust collector of the present invention, a high dust collecting effect is obtained.

FIG. 1 is a schematic diagram of an electrostatic precipitator according to the first embodiment. FIG. 2 is a schematic diagram illustrating a three-dimensional structure of electrodes included in the electrostatic precipitator according to the first embodiment. FIG. 3 is a plan view of the first plate electrode. FIG. 4 is a plan view of the second plate electrode. FIG. 5 is a cross-sectional view of the first plate electrode. FIG. 6 is a schematic diagram of an electric dust collector according to the second embodiment. FIG. 7 is a plan view of the first plate electrode. FIG. 8 is a plan view of the second plate electrode. FIG. 9 is a plan view of the third plate electrode. FIG. 10 is an external view of a portable air purifier. FIG. 11 is an external view of a vacuum cleaner. FIG. 12 is an external view of a robot type vacuum cleaner.

  Hereinafter, embodiments will be described with reference to the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected to substantially the same structure, and the overlapping description may be abbreviate | omitted or simplified.

  In the following embodiments, the Z-axis direction is, for example, the vertical direction. The X-axis direction and the Y-axis direction are directions orthogonal to each other on a plane (horizontal plane) perpendicular to the Z-axis.

(Embodiment 1)
[Constitution]
First, the configuration of the electrostatic precipitator according to Embodiment 1 will be described. FIG. 1 is a schematic diagram (schematic cross-sectional view) of the electrostatic precipitator according to the first embodiment. FIG. 2 is a schematic diagram illustrating a three-dimensional structure of electrodes included in the electrostatic precipitator according to the first embodiment.

  As shown in FIG. 1, the electrostatic precipitator 10 according to the first embodiment includes a duct 11, a fan 12, a discharge electrode 13a, a reference electrode 13b, a first plate electrode 14, and a second plate. The electrode 15 and the control part 17 are provided. The first plate electrode 14 has a plurality of openings 14a, and the second plate electrode 15 has a plurality of openings 15a.

  The duct 11 is an example of a structure, and has an intake port 11a and an exhaust port 11b. Air is directed from the intake port 11a to the exhaust port 11b in a predetermined direction (from the Y axis − side to the Y axis + side in the drawing). A flow path that flows in the direction of heading is formed. The duct 11 is, for example, a tubular member. In addition, the structure used for the electrostatic precipitator 10 is not limited to a tubular member such as the duct 11, and may have any shape as long as it forms a flow path.

  The material which comprises the duct 11 is not specifically limited. For example, the duct 11 is made of an insulating material such as resin. By forming the duct 11 from an insulating material, it is possible to suppress discharge between the duct 11 and the discharge electrode 13a.

  One end of the duct 11 (Y-axis-side end) is an air inlet 11a, and air is introduced into the duct 11 from the air inlet 11a. Inside the duct 11, a discharge electrode 13a, a reference electrode 13b, a first plate electrode 14 and a second plate electrode 15 are arranged. That is, the duct 11 also functions as a housing that houses the discharge electrode 13 a, the reference electrode 13 b, the first plate electrode 14, and the second plate electrode 15. The discharge electrode 13a (reference electrode 13b), the first plate electrode 14, and the second plate electrode 15 are arranged in this order from the intake port 11a side to the exhaust port 11b.

  The other end of the duct 11 (Y-axis + side end) is an exhaust port 11b. The exhaust port 11b is an opening through which air that has passed through the flow path is discharged. A fan 12 is connected to the exhaust port 11b.

  The fan 12 is a device for guiding air from the outside of the electrostatic precipitator 10 to the inside of the electrostatic precipitator 10. The fan 12 is attached to the exhaust port 11b of the duct 11 and draws air into the duct 11 through the intake port 11a by sucking air. Further, the fan 12 discharges the air whose dust is reduced by the first plate electrode 14 and the second plate electrode 15 to the outside of the electric dust collector 10. Specifically, the fan 12 is a centrifugal fan, for example.

  The arrangement of the fan 12 is not particularly limited. For example, the fan 12 may be attached to the intake port 11a of the duct 11 and send out air toward the exhaust port 11b. When the fan 12 is attached to the exhaust port 11b, the dust passing through the fan 12 is reduced in dust, so that the dust can be prevented from accumulating in the fan 12.

  The discharge electrode 13a is an electrode used for discharge for charging dust contained in the air in the flow path. The discharge electrode 13a is disposed so as to face the reference electrode 13b serving as a ground potential (reference potential). The discharge for charging the dust occurs between the discharge electrode 13a and the reference electrode 13b. In FIG. 1 and FIG. 2, the discharge electrode 13a and the reference electrode 13b are arranged side by side in a predetermined direction inside the duct 11 (in the flow path formed by the duct 11). It is. The discharge electrode 13a and the reference electrode 13b may be arranged side by side in a direction crossing a predetermined direction. Further, the discharge electrode 13a and the reference electrode 13b may be disposed outside the duct 11.

  When a negative voltage or a positive voltage is applied to the discharge electrode 13a with respect to the reference electrode 13b, a discharge occurs between the discharge electrode 13a and the reference electrode 13b. In the example of FIGS. 1 and 2, a negative voltage is applied to the discharge electrode 13a with respect to the reference electrode 13b, and dust is negatively charged by the discharge generated thereby. This discharge is, for example, corona discharge.

  Each of the discharge electrode 13a and the reference electrode 13b is formed of a metal such as tungsten or stainless steel, for example. In the example of FIGS. 1 and 2, the discharge electrode 13a has a cylindrical shape and the reference electrode 13b has an elongated flat plate shape, but the shapes of the discharge electrode 13a and the reference electrode 13b are not particularly limited. Each of the discharge electrode 13a and the reference electrode 13b may have a rod shape, a flat plate shape, or a needle shape. Moreover, the discharge electrode 13a and the reference electrode 13b may not be the same shape, and may be the same shape.

  An interval between the discharge electrode 13a and the reference electrode 13b (interval of a portion where discharge occurs) is, for example, about several mm. The potential difference between the discharge electrode 13a and the reference electrode 13b is, for example, 10 kV.

  The electrostatic precipitator 10 includes two discharge electrodes 13a and two reference electrodes 13b, but may include one discharge electrode 13a and one reference electrode 13b. In addition, three or more reference electrodes 13b may be provided. The number of discharge electrodes 13a and the number of reference electrodes 13b are not particularly limited. One reference electrode 13b may be shared by a plurality of discharge electrodes 13a. That is, the number of discharge electrodes 13a and the number of reference electrodes 13b may be different.

  Next, the first plate electrode 14 will be described with reference to FIG. 3 in addition to FIGS. 1 and 2. FIG. 3 is a plan view of the first plate electrode 14.

  The first plate-like electrode 14 is a plate-like electrode (dust collection electrode) for collecting dust charged by discharge using the discharge electrode 13a. The first plate electrode 14 is disposed in the duct 11 (in the flow path formed by the duct 11) closer to the exhaust port 11b than the discharge electrode 13a and the reference electrode 13b. The first plate-like electrode 14 is disposed in the flow path so that the main surface is orthogonal to the predetermined direction, but may be disposed so that the main surface intersects the predetermined direction.

  When a positive voltage is applied to the first plate electrode 14 with respect to the ground potential (reference potential), the first plate electrode 14 is positively charged, and an electric field is generated between the first plate electrode 14 and the reference electrode 13b. Then, the first plate-like electrode 14 can suck dust that is negatively charged by the discharge and adhere the negatively-charged dust to the first plate-like electrode 14. When the dust is positively charged by the discharge, a negative voltage with respect to the ground potential is applied to the first plate electrode 14.

  The first plate electrode 14 is formed of a metal such as tungsten or stainless steel, for example. The planar view shape of the first plate-like electrode 14 is, for example, a rectangle, but may be other shapes such as a circle.

  For example, the first plate electrode 14 is placed in a groove provided on the inner wall surface of the duct 11 so as to close the flow path. The first plate electrode 14 has a plurality of openings 14a for allowing air in the flow path to pass therethrough. Each of the plurality of openings 14a has a circular shape in plan view, and one opening 14a has the same opening area (size) as the other openings 14a. In addition, the planar view shape of the opening 14a is not limited to a circle, and may be an ellipse or a rectangle. The opening area of one opening 14a and the number of the plurality of openings 14a are not particularly limited. The specific mode of the opening 14a may be appropriately determined experimentally or empirically.

  Next, the second plate electrode 15 will be described. FIG. 4 is a plan view of the second plate electrode 15. The second plate electrode 15 is disposed closer to the exhaust port 11b than the first plate electrode 14 and aligned with the first plate electrode 14 in a predetermined direction. The first plate electrode 14 and the second plate electrode 15 are arranged in parallel. The second plate electrode 15 has a plurality of openings 15a for allowing air in the flow path to pass therethrough.

  The plurality of openings 15a of the second plate electrode 15 have a circular shape in plan view, and one opening 15a has the same opening area (size) as the other openings 15a. The opening area of the opening 15a is equal to the opening 14a. In addition, the planar view shape of the opening 15a is not limited to a circle, and may be an ellipse or a rectangle. The opening area of one opening 15a and the number of the plurality of openings 15a are not particularly limited. The specific mode of the opening 15a may be determined as appropriate experimentally or empirically.

  As shown in FIGS. 2 to 4, the number of openings 14 a included in the first plate electrode 14 is equal to the number of openings 15 a included in the second plate electrode 15. Further, as described above, the opening area of the opening 14a is equal to the opening area of the opening 15a. Therefore, the total opening area of the plurality of openings 14 a included in the first plate electrode 14 is equal to the total opening area of the plurality of openings 15 a included in the second plate electrode 15.

  In consideration of manufacturing errors in the opening area, the total opening area of the plurality of openings 14 a included in the first plate electrode 14 is substantially equal to the total opening area of the plurality of openings 15 a included in the second plate electrode 15. It can be said that they are equal. Here, “substantially equal” means, for example, that the difference in total opening area is within 5% (the ratio of the total opening area of the other plate electrode to the total opening area of one plate electrode is 95% or more and 105% or less) Means.

  When there is a difference between the total opening area of the first plate-like electrode 14 and the total opening area of the second plate-like electrode 15, the plate-like electrode having the smaller total opening area becomes a neck and the flow rate decreases. End up. In other words, the pressure loss increases in the plate electrode having the smaller total opening area.

  On the other hand, if the total opening area of the plurality of openings 14 a included in the first plate electrode 14 is substantially equal to the total opening area of the plurality of openings 15 a included in the second plate electrode 15, A decrease in flow rate (pressure loss) can be suppressed and the flow rate can be stabilized.

  The arrangement of the plurality of openings 15 a in the second plate electrode 15 is different from the arrangement of the plurality of openings 14 a in the first plate electrode 14. As shown in FIG. 4, each of the plurality of openings 14 a (shown by broken lines in FIG. 4) of the first plate electrode 14 has the second plate electrode 15 when viewed from a predetermined direction. It does not overlap with the opening 15a. The effect obtained by such a configuration will be described later.

  The 2nd plate-shaped electrode 15 demonstrated above is the structure similar to the 1st plate-shaped electrode 14 except arrangement | positioning of the some opening 15a. For this reason, the description overlapping with the first plate electrode 14 is omitted.

  The electrostatic precipitator 10 includes a plurality of plate-like electrodes arranged at intervals in a predetermined direction, but the electrostatic precipitator 10 may include at least one plate-like electrode.

  The control unit 17 applies a voltage to the discharge electrode 13 a, the first plate electrode 14, and the second plate electrode 15. The control unit 17 controls the voltage applied to the discharge electrode 13a, the first plate electrode 14, and the second plate electrode 15. For example, the control unit 17 controls on and off of the voltage applied to the discharge electrode 13 a, the first plate electrode 14, and the second plate electrode 15.

  Specifically, the control unit 17 is a high-voltage power supply circuit and its control circuit. As the high-voltage power supply circuit, any voltage source that can output a desired DC voltage may be used. Further, instead of the control circuit or in addition to the control circuit, a microcomputer or a processor may be used.

[Operation]
Next, the operation of the electrostatic precipitator 10 will be described with reference to FIGS. By applying a voltage between the discharge electrode 13a and the reference electrode 13b, a discharge is generated between the discharge electrode 13a and the reference electrode 13b.

  Dust contained in the air flowing into the duct 11 from the air inlet 11a due to the rotation of the fan 12 is negatively charged by the ionized gas generated by the discharge when passing between the discharge electrode 13a and the reference electrode 13b. .

  The negatively charged dust moves to the exhaust port 11b side by the rotation of the fan 12. Here, the negatively charged dust is attracted to the positively charged first plate electrode 14 and adheres to the first plate electrode 14.

  In the air in the flow path, there is also dust that is not affected by the discharge due to reasons such as not passing between the discharge electrode 13a and the reference electrode 13b. Such dust includes positively charged dust. When positively charged dust collides with strongly negatively charged dust due to discharge, it adheres to negatively charged dust. That is, dust is aggregated.

  Moreover, in the electrostatic precipitator 10, the 1st plate-shaped electrode 14 is arrange | positioned in a flow path so that a main surface may cross | intersect a predetermined direction. Therefore, the dust moving in the flow path may collide with the first plate electrode 14 and fall.

  In particular, the aggregated and larger dust is less likely to pass through the opening 14a, so it collides with the first plate electrode 14 and falls more easily than the smaller dust. Further, it is considered that the increased dust easily collides with the first plate-like electrode 14 and easily falls due to weakening of charging due to aggregation or an increase in mass due to aggregation.

  Thus, the electrostatic precipitator 10 not only electrically collects dust using the first plate-like electrode 14, but also uses the first plate-like electrode 14 as a dust obstacle.

  For example, when the first plate electrode 14 is arranged so that the main surface is parallel to the XY plane, the first plate electrode 14 is unlikely to be an obstacle to dust. The dust collection effect due to dust colliding with the plate electrode 14 is small. On the other hand, in the electrostatic precipitator 10, the first plate electrode 14 is arranged so as to intersect with a predetermined direction, and the first plate electrode 14 is used as an obstacle to dust, so that the dust collection effect is enhanced. It has been.

  In addition, some dust that is negatively charged by discharge and some dust that has become agglomerated due to discharge are likely to pass through the opening 14a because they are more strongly affected by the airflow than the electric field. Such dust adheres to the second plate electrode 15. Such dust may collide with the second plate electrode 15 and fall. That is, the electrostatic precipitator 10 not only electrically collects dust using the second plate-like electrode 15 but also can use the second plate-like electrode 15 as an obstacle to dust.

  Further, as illustrated in FIG. 4, in the electrostatic precipitator 10, each of the plurality of openings 14 a (illustrated by broken lines in FIG. 4) of the first plate electrode 14 when viewed from a predetermined direction. Does not overlap with the opening 15 a of the second plate electrode 15. For example, when the suction force of the fan 12 is strong, if the plurality of openings 14a of the first plate electrode 14 and the openings 15a of the second plate electrode 15 overlap, dust that has passed through the openings 14a The possibility of going straight in a predetermined direction as it is and passing through the opening 15a is increased.

  According to the configuration in which the opening 14a and the opening 15a do not overlap, it is possible to promote the adhesion or collision of the dust that has passed through the opening 14a to the second plate electrode 15. That is, the dust collection effect of the electric dust collector 10 can be enhanced.

  As described above, in the electrostatic precipitator 10, the first plate electrode 14 and the second plate electrode 15 are arranged so as to intersect in a predetermined direction, and are used as an obstacle for dust. That is, the electrostatic precipitator 10 not only electrically collects dust using the first plate electrode 14 and the second plate electrode 15 but also uses the first plate electrode 14 and the second plate electrode 15. Use as an obstacle to dust. Thereby, the dust collection effect is enhanced.

  When it is desired to enhance the dust collection effect by colliding with the edge of the opening 14a of the first plate electrode 14, one opening 14a of the first plate electrode 14 has an opening area closer to the exhaust port 11b. May be made smaller. FIG. 5 is a cross-sectional view of the first plate electrode 14.

  As shown in FIG. 5, the opening 14 a is tapered in the thickness direction of the first plate electrode 14. That is, the cross-sectional shape of the opening 14a is tapered. Specifically, the diameter of the opening 14a decreases as it approaches the exhaust port 11b.

  The dust collection effect can be enhanced by causing the opening 14a to collide with the edge (tapered surface) of the opening 14a of the first plate electrode 14. The opening 15a of the second plate electrode 15 may have the same configuration.

(Embodiment 2)
In the first embodiment, the electrostatic precipitator 10 includes two plate electrodes. However, the electrostatic precipitator may include at least one plate electrode. For example, the electrostatic precipitator may include three or more plate electrodes.

  When the electrostatic precipitator includes a plurality of plate electrodes, the plate electrode disposed closer to the exhaust port 11b may have a smaller opening area of the opening of the plate electrode. Hereinafter, the electric dust collector according to the second embodiment will be described. FIG. 6 is a schematic diagram (schematic cross-sectional view) of the electrostatic precipitator according to the second embodiment.

  As shown in FIG. 6, the electrostatic precipitator 10 a according to the second embodiment is different from the electrostatic precipitator 10 in that it includes three plate electrodes. The three plate electrodes include a first plate electrode 24, a second plate electrode 25 positioned closer to the exhaust port 11b than the first plate electrode 24, and an exhaust port 11b than the second plate electrode 25. A third plate-like electrode 26 located on the side is included.

  Each of the first plate-like electrode 24, the second plate-like electrode 25, and the third plate-like electrode 26 is disposed in the flow path such that the main surface intersects (orthogonal) with a predetermined direction. A plurality of openings for passing air.

  Each of the first plate-like electrode 24, the second plate-like electrode 25, and the third plate-like electrode 26 has openings having different opening areas. 7 is a plan view of the first plate electrode 24, FIG. 8 is a plan view of the second plate electrode 25, and FIG. 9 is a plan view of the third plate electrode 26. As shown in FIG. Note that the shape of the opening, the opening area of the opening, and the arrangement of the plurality of openings illustrated in FIGS. 7 to 8 are examples. The specific mode of the opening is not particularly limited.

  As shown in FIGS. 6 to 9, the opening area of one opening 24 a of the first plate electrode 24 is larger than the opening area of one opening 25 a of the second plate electrode 25. Further, the opening area of one opening 25 a of the second plate electrode 25 is larger than the opening area of one opening 26 a of the third plate electrode 26.

  As a result, an effect such as so-called “sieving” is obtained, and the aggregated and larger dust is collected by the first plate electrode 24 and is located closer to the exhaust port 11 b than the first plate electrode 24. Large dust is difficult to reach the second plate electrode 25. If it does so, it will be suppressed that the opening 25a which the 2nd plate-shaped electrode 25 has is obstruct | occluded with a big dust. Therefore, it is possible to reduce the maintenance work for eliminating the clogging of the opening 25a.

  Similarly, of the dust that has passed through the first plate electrode 24, relatively large dust is collected by the second plate electrode 25 and is located closer to the exhaust port 11b than the second plate electrode 25. It becomes difficult for large dust to reach the plate electrode 26. If it does so, it will be suppressed that the opening 26a which the 3rd plate-shaped electrode 26 has is obstruct | occluded with a big dust. Therefore, it is possible to reduce the maintenance work for eliminating the clogging of the opening 26a.

  The total opening area of the plurality of openings 24 a included in the first plate electrode 24, the total opening area of the plurality of openings 25 a included in the second plate electrode 25, and the plurality of openings 26 a included in the third plate electrode 26. The total opening area may be substantially equal. That is, the total opening area of all the plate electrodes provided in the electrostatic precipitator 10a may be substantially equal.

  Thereby, the fall (pressure loss) of the flow volume in any plate-like electrode can be suppressed, and the flow volume can be stabilized.

  Further, when the opening area of one opening 24a is larger than the opening area of one opening 25a, the opening 24a may not overlap the opening 25a when viewed from a predetermined direction. Similarly, when the opening area of one opening 25a is larger than the opening area of one opening 26a, the opening 25a may not overlap the opening 26a when viewed from a predetermined direction.

  Thereby, the adhesion or collision of the dust that has passed through the opening 24a to the second plate-like electrode 25 and the adhesion or collision of the dust that has passed through the opening 25a to the third plate-like electrode 26 can be promoted. That is, the dust collection effect of the electric dust collector 10a can be enhanced.

(Effects etc.)
As described above, the electrostatic precipitator 10 includes the duct 11 having the air inlet 11a and the air outlet 11b and forming a flow path in which air flows in a predetermined direction from the air inlet 11a to the air outlet 11b. A discharge electrode 13a used for discharge for charging dust contained in the air. The duct 11 is an example of a structure.

  The electrostatic precipitator 10 includes a plate electrode for collecting dust charged by discharge, and the plate electrode is disposed in the flow path so that the main surface intersects a predetermined direction. A plurality of openings for passing air.

  The plate-like electrodes arranged in this way not only electrically collect dust, but also function as an obstacle to dust and can collect dust structurally. Therefore, according to the electric dust collector 10, a high dust collection effect is obtained. The same effect can be obtained with the electrostatic precipitator 10a according to the second embodiment.

  Moreover, the electrostatic precipitator 10 may be provided with a plurality of plate-like electrodes arranged at intervals in a predetermined direction. The plurality of plate-like electrodes may include, for example, a first plate-like electrode 14 and a second plate-like electrode 15 located closer to the exhaust port 11b than the first plate-like electrode 14.

  Thereby, since a plurality of plate-like electrodes serving as dust obstacles are provided, the dust collection effect is enhanced as compared with the case of one plate-like electrode.

  Moreover, like the electrostatic precipitator 10 a, the opening area of one opening 24 a included in the first plate electrode 24 may be larger than the opening area of one opening 25 a included in the second plate electrode 25.

  As a result, a so-called “sieving” effect is obtained, and the aggregated and larger dust is collected by the first plate electrode 24 and reaches the second plate electrode 25 located closer to the exhaust port 11b. It becomes difficult to do. If it does so, it will be suppressed that the opening 25a with a smaller opening area than the opening 24a which the 2nd plate-shaped electrode 25 has is obstruct | occluded with dust. Therefore, it is possible to reduce the trouble of maintenance for removing the clogging of the opening 25a.

  Further, like the electrostatic precipitator 10, the total opening area of the plurality of openings 14 a included in the first plate electrode 14 may be substantially equal to the total opening area of the plurality of openings 15 a included in the second plate electrode 15. Good.

  When there is a difference in the total opening area between the first plate electrode 14 and the second plate electrode 15, the plate electrode having the smaller total opening area becomes a neck and the flow rate is reduced. According to the said structure, the fall of the flow volume by a one part plate electrode can be suppressed, and a flow volume can be stabilized.

  In addition, as in the case of the electric dust collector 10, each of the plurality of openings 14 a included in the first plate electrode 14 does not overlap with the opening 15 a included in the second plate electrode 15 when viewed from a predetermined direction. Also good.

  Thereby, it is suppressed that the dust which passed the opening 14a passes the opening 15a as it is, and the adhesion or collision to the 2nd plate-shaped electrode 15 of the dust which passed the opening 14a can be accelerated | stimulated. That is, the dust collection effect of the electric dust collector 10 can be enhanced.

  Further, like the electrostatic precipitator 10, the first plate electrode 14 has a main surface orthogonal to a predetermined direction, and one opening 14a of the first plate electrode 14 has an opening area closer to the exhaust port 11b. May be smaller.

  Thereby, it becomes easy for dust to collide with the edge of the opening 14a of the 1st plate-shaped electrode 14, and it can improve a dust collection effect by this.

(Other embodiments)
As mentioned above, although the electric dust collector which concerns on Embodiment 1 and 2 was demonstrated based on Embodiment, this invention is not limited to said Embodiment 1 and 2. FIG.

  For example, in the electric dust collector, the reference electrode may be omitted. In addition, a metal member other than the electrode (for example, a duct formed of metal) may be used as the reference electrode.

  Moreover, the electric dust collector may include a filter. The filter is a collecting member for collecting relatively large dust in the air guided into the electric dust collector. A known air filter can be used as the filter. As the filter, for example, a High Efficiency Particulate Air (HEPA) filter or the like may be used.

  In addition, the attachment position of a filter is not specifically limited. The filter may be attached at any position such as a duct inlet or a duct outlet. The filter is preferably attached detachably (replaceable).

  Moreover, the electric dust collector according to the first and second embodiments is specifically realized as, for example, an industrial stationary air purifier. However, the electrostatic precipitator according to Embodiments 1 and 2 may be realized as a home-use portable air purifier as shown in FIG. FIG. 10 is an external view of a portable air purifier.

  Moreover, this invention may be implement | achieved as a vacuum cleaner provided with the electric dust collector which concerns on the said Embodiment 1 and 2. FIG. FIG. 11 is an external view of a vacuum cleaner. Moreover, this invention may be implement | achieved as a robot type vacuum cleaner provided with the electric dust collector which concerns on the said embodiment. FIG. 12 is an external view of a robot type vacuum cleaner.

  In addition, any combination of the components and functions in the embodiment and the modification can be arbitrarily combined without departing from the gist of the present invention, and the form obtained by making various modifications conceived by those skilled in the art with respect to the embodiment and the modification. The embodiment realized by the above is also included in the present invention.

10, 10a Electric dust collector 11 Duct (structure)
11a Intake port 11b Exhaust port 13a Discharge electrode 14, 24 First plate electrode 14a, 15a, 24a, 25a, 26a Open 15, 25 Second plate electrode

Claims (6)

A structure having an intake port and an exhaust port, and forming a flow path in which air flows in a predetermined direction from the intake port to the exhaust port;
An electrode used for discharge for charging dust contained in the air in the flow path;
A plate-like electrode for collecting the dust charged by the discharge,
The plate-like electrode is an electric dust collector that is disposed in the flow path such that a main surface intersects the predetermined direction, and has a plurality of openings for allowing air in the flow path to pass therethrough. The electrostatic precipitator comprises a plurality of the plate-like electrodes arranged at intervals in the predetermined direction,
The electrostatic precipitator according to claim 1, wherein the plurality of plate-like electrodes include a first plate-like electrode and a second plate-like electrode positioned closer to the exhaust port than the first plate-like electrode. . The electrostatic precipitator according to claim 2, wherein an opening area of one opening of the first plate electrode is larger than an opening area of one opening of the second plate electrode. The electrostatic precipitator according to claim 2 or 3, wherein a total opening area of the plurality of openings of the first plate electrode is substantially equal to a total opening area of the plurality of openings of the second plate electrode. The electricity according to any one of claims 2 to 4, wherein each of the plurality of openings of the first plate electrode does not overlap with the openings of the second plate electrode when viewed from the predetermined direction. Dust collector. The plate-like electrode has a main surface orthogonal to the predetermined direction,
The electrostatic precipitator according to any one of claims 1 to 5, wherein one opening of the plate-like electrode has an opening area that decreases as it approaches the exhaust port.

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