JP2017140574A - Electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric dust collector capable of restraining re-scattering of dust.SOLUTION: An electric dust collector 10 comprises a coagulation part 13 having a positive electrode 13a and a negative electrode 13c and coagulating dust electrified by discharge of using the positive electrode 13a and dust electrified by discharge of using the negative electrode 13c. The electric dust collector 10 comprises a discharge electrode 14a used for the discharge for electrifying the dust coagulated by the coagulation part 13 and a dust collecting electrode 15a for collecting the dust electrified by the discharge of the discharge electrode 14a.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 with a dust collecting electrode to which a voltage is applied. For example, Patent Document 1 discloses an air treatment device that prevents dirt in a room and improves dust collection efficiency by increasing dust collection efficiency.

JP 2009-106827 A

  By the way, in the above air processing apparatuses, it is a subject to suppress that the collected dust is scattered again.

  The present invention provides an electrostatic precipitator capable of suppressing dust re-scattering.

  An electrostatic precipitator according to an aspect of the present invention includes a positive electrode and a negative electrode, and dust charged by discharge using the positive electrode and dust charged by discharge using the negative electrode. An aggregating part for aggregating, a discharge electrode used for discharging for charging the dust agglomerated by the aggregating part, and a dust collecting electrode for collecting the dust charged by the discharge of the discharge electrode.

  The electric dust collector of the present invention can suppress dust re-scattering.

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 schematic diagram of an electric dust collector according to the second embodiment. FIG. 4 is a schematic diagram of an electric dust collector according to the third embodiment. FIG. 5 is a schematic diagram illustrating another configuration of the electric dust collector according to the third embodiment. FIG. 6 is an external view of a portable air purifier. FIG. 7 is an external view of the electric vacuum cleaner. FIG. 8 is an external view of the 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 Embodiment 1 includes a duct 11, a fan 12, an aggregation unit 13, a discharge electrode 14 a, a reference electrode 14 b, a dust collection electrode 15 a, A reference electrode 15b and a control unit 17 are provided. Aggregation part 13 has positive electrode 13a, two reference electrodes 13b, and negative electrode 13c.

  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 formed of an insulating material such as resin. Since the duct 11 is formed of an insulating material, discharge between the duct 11 and the discharge electrode 14a can be suppressed.

  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, an aggregating portion 13, a discharge electrode 14a, a reference electrode 14b, a dust collecting electrode 15a, a reference electrode 15b, and a dust collecting electrode 15c are arranged. That is, the duct 11 also functions as a housing that houses the aggregation portion 13, the discharge electrode 14a, the reference electrode 14b, the dust collection electrode 15a, the reference electrode 15b, and the dust collection electrode 15c. For example, the aggregation portion 13, the discharge electrode 14a, and the dust collection electrode 15a are arranged in a predetermined direction in this order from the side closer to the intake port 11a in the flow path formed by the duct 11.

  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 dust collection electrode 15 a and the reference electrode 15 b 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 aggregation part 13 is a component for aggregating dust. Specifically, the aggregating portion 13 includes a positive electrode 13a, a reference electrode 13b disposed to face the positive electrode 13a, a negative electrode 13c, and a reference electrode 13b disposed to face the negative electrode 13c. The aggregation portion 13 is disposed inside the duct 11 (in the flow path formed by the duct 11), but may be disposed outside the duct 11.

  The positive electrode 13a is an electrode used for discharge for positively charging dust contained in the air in the flow path. A positive voltage is applied to the positive electrode 13a by the control unit 17 with respect to the reference electrode 13b disposed to face the positive electrode 13a. Thereby, discharge occurs between the positive electrode 13a and the reference electrode 13b. Due to this discharge, dust passing near the positive electrode 13a is positively charged. This discharge is, for example, corona discharge.

  The reference electrode 13b is an electrode that becomes a ground potential (reference potential) in order to generate a discharge with the positive electrode 13a or the negative electrode 13c.

  The negative electrode 13c is an electrode used for discharging for negatively charging dust contained in the air in the flow path. A negative voltage is applied to the negative electrode 13c by the control unit 17 with respect to the reference electrode 13b disposed to face the negative electrode 13c. Thereby, discharge occurs between the negative electrode 13c and the reference electrode 13b. Due to this discharge, dust passing near the negative electrode 13c is negatively charged. This discharge is, for example, corona discharge.

  The dust charged positively by the discharge using the positive electrode 13a and the dust charged negatively by the discharge using the negative electrode 13c adhere to each other and become agglomerated dust (dust lump). Since such agglomerated dust has a larger mass than the dust before agglomeration, it is difficult for it to rescatter.

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

  The distance between the positive electrode 13a and the reference electrode 13b facing the positive electrode 13a and the distance between the negative electrode 13c and the reference electrode 13b facing the negative electrode 13c (that is, the distance at which discharge occurs) are, for example, , About a few mm. The potential difference between the positive electrode 13a and the reference electrode 13b facing the positive electrode 13a and the potential difference between the negative electrode 13c and the reference electrode 13b facing the negative electrode 13c are each 10 kV, for example.

  In addition, although the aggregation part 13 has four electrodes, the positive electrode 13a, the two reference electrodes 13b, and the negative electrode 13c, the number of the electrodes which the aggregation part 13 has is not specifically limited.

  For example, one reference electrode 13b may be shared by one positive electrode 13a and one negative electrode 13c. That is, the number of positive electrodes 13a (or the number of negative electrodes 13c) and the number of reference electrodes 13b may be different.

  Further, the aggregating portion 13 may include two or more positive electrodes 13a and two negative electrodes 13c, or may include three or more reference electrodes 13b. Further, the number of positive electrodes 13a and the number of negative electrodes 13c may be the same or different.

  The discharge electrode 14a is dust that passes in the vicinity of the discharge electrode 14a, and is an electrode that is used for discharge for charging the dust aggregated by the aggregation portion 13. The discharge electrode 14a is disposed so as to face the reference electrode 14b having a ground potential (reference potential). Discharge for charging the agglomerated dust occurs between the discharge electrode 14a and the reference electrode 14b.

  The discharge electrode 14a and the reference electrode 14b are disposed closer to the exhaust port 11b (downstream) than the aggregation portion 13 inside the duct 11 (in the flow path formed by the duct 11). In FIG. 1 and FIG. 2, the discharge electrode 14a and the reference electrode 14b are arranged side by side in a predetermined direction inside the duct 11 (in the flow path formed by the duct 11). Such an arrangement is an example. It is. The discharge electrode 14a and the reference electrode 14b may be arranged side by side in a direction crossing a predetermined direction.

  When a negative voltage or a positive voltage is applied to the discharge electrode 14a with respect to the reference electrode 14b, a discharge occurs between the discharge electrode 14a and the reference electrode 14b. In the example of FIGS. 1 and 2, a negative voltage is applied to the discharge electrode 14a with respect to the reference electrode 14b, and dust is negatively charged by the discharge generated thereby. This discharge is, for example, corona discharge.

  Each of the discharge electrode 14a and the reference electrode 14b is formed of a metal such as tungsten or stainless steel, for example. In the example of FIGS. 1 and 2, the discharge electrode 14a has a cylindrical shape and the reference electrode 14b has an elongated flat plate shape, but the shapes of the discharge electrode 14a and the reference electrode 14b are not particularly limited. Each of the discharge electrode 14a and the reference electrode 14b may have a rod shape, a flat plate shape, or a needle shape. Moreover, the discharge electrode 14a and the reference electrode 14b may not be the same shape, and may be the same shape.

  The interval between the discharge electrode 14a and the reference electrode 14b (interval where the discharge occurs) is, for example, about several mm. The potential difference between the discharge electrode 14a and the reference electrode 14b is, for example, 10 kV.

  The electrostatic precipitator 10 includes two discharge electrodes 14a and two reference electrodes 14b, but may include one discharge electrode 14a and one reference electrode 14b, or one discharge electrode 14a and one reference electrode 14b. Three or more reference electrodes 14b may be provided. The number of discharge electrodes 14a and the number of reference electrodes 14b are not particularly limited. One reference electrode 14b may be shared by a plurality of discharge electrodes 14a. That is, the number of discharge electrodes 14a and the number of reference electrodes 14b may be different.

  The dust collection electrode 15a is an electrode for collecting dust charged by discharge using the discharge electrode 14a. The dust collecting electrode 15a is disposed opposite to the reference electrode 15b that is a ground potential (reference potential). The dust collection electrode 15a and the reference electrode 15b are disposed in the duct 11 (in the flow path formed by the duct 11) closer to the exhaust port 11b than the discharge electrode 14a and the reference electrode 14b.

  When a negative voltage or a positive voltage is applied to the dust collection electrode 15a with respect to the reference electrode 15b, an electric field is generated between the dust collection electrode 15a and the reference electrode 15b. For example, when dust is positively charged, a negative voltage is applied to the dust collection electrode 15a with respect to the reference electrode 15b, whereby the charged dust adheres to the dust collection electrode 15a. For example, when dust is negatively charged, a positive voltage is applied to the dust collection electrode 15a with respect to the reference electrode 15b, whereby the charged dust adheres to the dust collection electrode 15a. In the example of FIGS. 1 and 2, a positive voltage is applied to the dust collection electrode 15a with respect to the reference electrode 15b.

  Each of the dust collection electrode 15a and the reference electrode 15b is formed of a metal such as tungsten or stainless steel, for example. Each of the dust collection electrode 15a and the reference electrode 15b has, for example, a flat plate shape, and is disposed such that main surfaces thereof face each other in a direction (for example, the Z-axis direction) orthogonal to a predetermined direction.

  Each of the dust collection electrode 15a and the reference electrode 15b may have a rod shape or a needle shape. In addition, the dust collection electrode 15a and the reference electrode 15b may not have the same shape, for example, one of the dust collection electrode 15a and the reference electrode 15b is a rod shape and the other is a flat plate shape.

  For example, when the distance between the dust collection electrode 15a and the reference electrode 15b (in the example of FIGS. 1 and 2, the distance in the Z-axis direction) is 20 mm, the potential difference between the dust collection electrode 15a and the reference electrode 15b is about 10 kV. is there.

  The dust collection electrode 15c is arranged side by side with the dust collection electrode 15a and the reference electrode 15b in a direction orthogonal to the predetermined direction. The reference electrode 15b is disposed between the dust collection electrode 15a and the dust collection electrode 15c. Since the dust collecting electrode 15c has the same configuration as the dust collecting electrode 15a except for the arrangement, detailed description thereof is omitted. In the electric dust collector 10, one reference electrode 15b is shared by the dust collection electrode 15a and the dust collection electrode 15c. However, even if one reference electrode is provided for one dust collection electrode. Good.

  The control unit 17 applies a voltage to the positive electrode 13a, the negative electrode 13c, the discharge electrode 14a, the dust collection electrode 15a, and the dust collection electrode 15c. Moreover, the control part 17 controls independently the voltage applied to the positive electrode 13a, the negative electrode 13c, the discharge electrode 14a, the dust collection electrode 15a, and the dust collection electrode 15c, respectively. For example, the control unit 17 controls on / off of the voltage applied to the positive electrode 13a, the negative electrode 13c, the discharge electrode 14a, the dust collection electrode 15a, and the dust collection electrode 15c, and the voltage application time. .

  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. 1 and 2.

  The control unit 17 applies a voltage between the positive electrode 13a and the reference electrode 13b facing the positive electrode 13a. As a result, a discharge is generated between the positive electrode 13a and the reference electrode 13b.

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

  The control unit 17 applies a voltage between the negative electrode 13c and the reference electrode 13b facing the negative electrode 13c. As a result, a discharge is generated between the negative electrode 13c 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 negative electrode 13c and the reference electrode 13b. .

  The positively charged dust and the negatively charged dust are attracted and aggregated (coarse). The agglomerated dust moves to the exhaust port 11b side by the rotation of the fan 12.

  Here, the control unit 17 applies a voltage between the discharge electrode 14a and the reference electrode 14b. As a result, a discharge is generated between the discharge electrode 14a and the reference electrode 14b. The agglomerated dust described above is negatively charged by the ionized gas generated by the discharge when passing between the discharge electrode 14a and the reference electrode 14b.

  The negatively charged dust moves further to the exhaust port 11b side by the rotation of the fan 12. Here, the control unit 17 applies a voltage between the dust collection electrode 15a and the reference electrode 15b and between the dust collection electrode 15c and the reference electrode 15b. That is, the dust collection electrode 15a and the dust collection electrode 15c are positively charged.

  Then, the negatively charged dust is attracted and attached to the positively charged dust collection electrode 15a or dust collection electrode 15c.

  At this time, the dust adhering to the dust collection electrode 15a or the dust collection electrode 15c is aggregated and has a large mass, and therefore, is difficult to rescatter. Some of the aggregated dust falls on the bottom surface of the duct 11 (the inner wall surface on the Z axis side) by its own weight, and the dust that has fallen by its own weight rescatters due to its large mass. Hateful.

  Moreover, fine dust is easy to scatter. There is a method of increasing the length of the dust collecting electrode 15a in a predetermined direction as much as possible in order to sufficiently collect such fine dust. On the other hand, since the dust aggregated by the aggregation part 13 is difficult to scatter, even if the length of the dust collection electrode 15a in the predetermined direction is shortened, a high dust collection effect is obtained. That is, the length of the dust collection electrode 15a in the predetermined direction can be shortened. That is, the electrostatic precipitator 10 can be easily downsized.

[Effects of First Embodiment, etc.]
As described above, the electrostatic precipitator 10 includes the positive electrode 13a and the negative electrode 13c, and the dust charged by the discharge using the positive electrode 13a and the dust charged by the discharge using the negative electrode 13c. And aggregating part 13 for agglomerating. The electrostatic precipitator 10 also includes a discharge electrode 14a used for discharge for charging the dust aggregated by the aggregation unit 13, and a dust collection electrode 15a for collecting dust charged by the discharge of the discharge electrode 14a. Prepare.

  Thereby, after dust is aggregated by the aggregation part 13, electrical dust collection by the discharge electrode 14a and the dust collection electrode 15a (dust collection electrode 15c) is performed. In such a configuration, since fine dust is aggregated into dust having a large mass, re-scattering is suppressed. That is, the electrostatic precipitator 10 can suppress dust re-scattering.

  Moreover, since the dust aggregated by the aggregation part 13 is hard to scatter, even if the length in the predetermined direction of the dust collection electrode 15a is shortened, the high dust collection effect is acquired. That is, the length of the dust collection electrode 15a in the predetermined direction can be shortened, and the electric dust collector 10 can be downsized.

  The electrostatic precipitator 10 may further include a duct 11 having an air inlet 11a and an 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. The duct 11 is an example of a structure. Aggregation part 13, discharge electrode 14a, and dust collection electrode 15a may be arranged in this order in a predetermined direction in the channel.

  Thereby, the electric dust collector 10 can collect dust with respect to the air passing through the duct 11.

(Embodiment 2)
[Constitution]
When the electrostatic precipitator 10 is used for a long period of time, dust accumulates in each electrode of the electrostatic precipitator 10. Such dust becomes an electrical resistance and causes a reduction in discharge efficiency. In addition, if the dust collection electrodes 15a and 15c accumulate too much dust, the dust collection function also deteriorates.

  The dust accumulated on the electrodes can be removed by maintenance by a user (person), for example, but such maintenance takes time. Therefore, in Embodiment 2, an electrostatic precipitator that can suppress the accumulation of dust on the electrode will be described. FIG. 3 is a schematic diagram (schematic cross-sectional view) of the electrostatic precipitator according to the second embodiment.

  As shown in FIG. 3, the electrostatic precipitator 10 a according to Embodiment 2 is different from the electrostatic precipitator 10 in that it includes a vibrating unit 18 and a current measuring unit 19.

  The vibration unit 18 is a device that applies vibration to the discharge electrode 14 a based on the control of the control unit 17. The dust collected on the discharge electrode 14a is shaken off by vibration. Specifically, the vibration unit 18 is a vibration motor or a vibration actuator.

  In the second embodiment, the vibration unit 18 applies vibration to the discharge electrode 14a. In the electrostatic precipitator 10a, the dust positively charged by the discharge of the positive electrode 13a is not agglomerated with the dust negatively charged by the discharge of the negative electrode 13c, and is directly adhered to the negatively charged discharge electrode 14a. And dust that accumulates. The vibration part 18 shakes off the dust adhering to and accumulating on the discharge electrode 14a.

  In addition, the vibration part 18 may give a vibration to electrodes other than the discharge electrode 14a. That is, the vibration unit 18 may apply vibration to at least one of the positive electrode 13a, the reference electrode 13b, the negative electrode 13c, the discharge electrode 14a, the dust collection electrode 15a, the reference electrode 15b, and the dust collection electrode 15c.

  Here, when vibration is applied to the dust collection electrode 15a, the reference electrode 15b, and the dust collection electrode 15c, dust may re-scatter. When dust re-scatters, it is better that vibration is not applied to the dust collection electrode 15a, the reference electrode 15b, and the dust collection electrode 15c.

  The vibration by the vibration unit 18 is performed periodically, for example. Further, for example, the vibration unit 18 may vibrate the discharge electrode 14a for a certain period after the power-off operation is performed on the electric dust collector 10a, and then the power may be turned off.

  Moreover, the vibration part 18 may give a vibration to an electrode to the discharge electrode 14a, when the electric current which the electric current measurement part 19 measures becomes smaller than predetermined value.

  The current measuring unit 19 measures the current flowing through the discharge electrode 14a during discharge using the discharge electrode 14a. Specifically, the current measurement unit 19 is a current sensor realized by a Hall element, a CT (Current Transformer), a Rogowski circuit, or a GMR (Giant Magnetic Resistance) element.

  When the vibration unit 18 applies vibration to at least one of the positive electrode 13a, the reference electrode 13b, the negative electrode 13c, the discharge electrode 14a, the dust collection electrode 15a, the reference electrode 15b, and the dust collection electrode 15c, the current measurement unit 19 only needs to be able to measure the current of the at least one electrode corresponding to the vibrating portion 18.

  As described above, when dust is accumulated in the discharge electrode 14a, such dust becomes an electrical resistance. When the voltage applied to the discharge electrode 14a during discharge is constant, the current flowing through the discharge electrode 14a decreases as the electrical resistance increases.

  Therefore, based on the control of the control unit 17, the vibration unit 18 may apply vibration to the discharge electrode 14a when the current measured by the current measurement unit 19 becomes smaller than a predetermined value. In other words, the control unit 17 may determine whether dust is accumulated in the discharge electrode 14a using the current measuring unit 19, and may vibrate the vibration unit 18 when it is determined that dust is accumulated. . Thereby, when it is estimated that dust is accumulated in the discharge electrode 14a, the dust attached to the discharge electrode 14a is automatically reduced by vibration. The predetermined value may be appropriately determined experimentally or empirically.

[Effects of Second Embodiment, etc.]
As described above, the electrostatic precipitator 10a includes the vibration unit 18 that vibrates the discharge electrode 14a.

  Among the dust positively charged by the discharge of the positive electrode 13a, the dust that does not aggregate with the negatively charged dust by the discharge of the negative electrode 13c, and adheres and accumulates on the negatively charged discharge electrode 14a as it is. is there. The vibration part 18 can reduce the dust adhering to the discharge electrode 14a due to the discharge using the positive electrode 13a by vibration.

  The electrostatic precipitator 10a also includes a current measuring unit 19 that measures the current flowing through the discharge electrode 14a. The vibrating unit 18 discharges when the current measured by the current measuring unit 19 becomes smaller than a predetermined value. Vibration may be applied to the electrode 14a.

  Thereby, when it is estimated that the dust has accumulated in the discharge electrode 14a, the dust adhering to the discharge electrode 14a is automatically reduced by vibration.

(Embodiment 3)
[Constitution]
In the third embodiment, an electrostatic precipitator having a structure for promoting the aggregation of dust by the aggregation unit 13 will be described. FIG. 4 is a schematic diagram (schematic cross-sectional view) of the electrostatic precipitator according to the third embodiment.

  The electrostatic precipitator 10b according to Embodiment 3 is different from the electrostatic precipitator 10 in the structure of the duct 11c. Specifically, the duct 11c is between a position where the aggregation portion 13 is provided (hereinafter also referred to as a first position) and a position where the discharge electrode 14a is provided (hereinafter also referred to as a second position). The flow path diameter (opening diameter) is reduced in diameter as it is closer to the exhaust port 11b (becomes smaller gradually). That is, the flow path formed by the duct 11c is narrower than the first position between the first position where the aggregation portion 13 is provided and the second position where the discharge electrode 14a is provided. The second position is a position closer to the exhaust port 11b than the first position in the predetermined direction.

  In the narrowed flow path, the probability that positively charged dust and negatively charged dust come into contact with each other increases. For this reason, according to the structure like the duct 11c, aggregation of dust is accelerated | stimulated, and electric dust collection using the discharge electrode 14a, the dust collection electrode 15a, and the dust collection electrode 15c is performed after that. Therefore, dust re-scattering can be suppressed.

  In the duct 11c, the flow path diameter is substantially constant while being narrower than the first position nearer the exhaust port 11b than the second position (downstream from the second position). However, the flow path formed by the duct 11c may be selectively narrowed only in a portion between the first position where the aggregation portion 13 is provided and the second position where the discharge electrode is provided. That is, the channel diameter at the first position and the channel diameter at the second position may be substantially the same.

  Further, the structure for promoting the aggregation of dust by the aggregation portion 13 is not limited to the structure like the duct 11c. FIG. 5 is a schematic diagram (schematic cross-sectional view) showing another configuration of the electrostatic precipitator according to the third embodiment.

  As shown in FIG. 5, the electrostatic precipitator 10 c is different from the electrostatic precipitator 10 in that the electrostatic precipitator 10 c includes a plate member 20 a and a plate member 20 b erected on the inner wall of the duct 11. Specifically, the plate material 20a and the plate material 20b are erected on the inner wall of the duct 11 between a first position where the aggregation portion 13 is provided and a second position where the discharge electrode 14a is provided. .

  The plate material 20a and the plate material 20b are so-called baffle plates. The plate material 20a and the plate material 20b partially obstruct the flow of air in the flow path. Thereby, when the air passing through the flow path formed by the duct 11 hits the plate material 20a and the plate material 20b, dust contained in the air is likely to come into contact with each other. Since the plate member 20a and the plate member 20b are located closer to the exhaust port 11b than the aggregation portion 13, when the air passing through the flow channel hits the plate member 20a and the plate member 20b, positively charged dust and negatively charged dust come into contact with each other. Probability is increased. That is, according to the structure like the plate material 20a and the plate material 20b, it is possible to promote the aggregation of dust and suppress the re-scattering of dust.

  Each of the plate member 20a and the plate member 20b is disposed so that one end is connected to the inner wall of the duct 11 and the other end is located closer to the exhaust port 11b than the one end. Each of the plate material 20a and the plate material 20b is erected in an inclined state so as to guide the air in the flow path to the discharge electrode 14a. Thereby, it can accelerate | stimulate that the aggregated dust is charged by the discharge of the discharge electrode 14a.

  In addition, arrangement | positioning (the number of board | plate materials, and direction (inclination) of board | plate materials) of the board | plate materials 20a and 20b shown by FIG. 5 is an example. The plate member 20a and the plate member 20b are preferably arranged at positions determined empirically or experimentally so that the probability that the positively charged dust and the negatively charged dust come into contact with each other increases. It is sufficient that at least one plate material is provided. In addition, each of the plate material 20a and the plate material 20b may be formed of resin or may be formed of metal.

[Effects of Embodiment 3, etc.]
As described above, in the electrostatic precipitator 10b, the flow path formed by the duct 11c is between the first position where the aggregation portion 13 is provided and the second position where the discharge electrode 14a is provided. It is narrower than 1 position.

  As a result, the probability that the positively charged dust and the negatively charged dust come into contact with each other in the narrowed flow path is increased, so that the aggregation of the dust can be promoted. Then, the dust re-scattering is suppressed by promoting the aggregation of the dust.

  Moreover, the electrostatic precipitator 10c is provided with a plate material erected on the inner wall of the duct 11 between a first position where the aggregation portion 13 is provided and a second position where the discharge electrode 14a is provided. .

  Thereby, the probability that the positively charged dust and the negatively charged dust come into contact with each other is increased when the air passing through the flow path hits the plate material 20a and the plate material 20b. Then, the dust re-scattering is suppressed by promoting the aggregation of the dust.

(Other embodiments)
As mentioned above, although the electric dust collector which concerns on Embodiment 1-3 was demonstrated based on Embodiment, this invention is not limited to said Embodiment 1-3.

  For example, in the electric dust collector, the reference electrode may be omitted by discharging between the discharge electrode and the dust collection electrode. 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).

  In addition, the electric dust collector according to the first to third embodiments is specifically realized as, for example, an industrial stationary air purifier. However, the electrostatic precipitator according to the first and second embodiments may be realized as a portable air purifier for home use as shown in FIG. FIG. 6 is an external view of a portable air purifier.

  Moreover, this invention may be implement | achieved as a vacuum cleaner provided with the electrical dust collector which concerns on the said Embodiment 1-3. FIG. 7 is an external view of the electric 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. 8 is an external view of the 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, 10b, 10c Electric dust collector 11, 11c Duct (structure)
11a Intake port 11b Exhaust port 13 Aggregation part 13a Positive electrode 13c Negative electrode 14a Discharge electrode 15a, 15c Dust collection electrode 18 Vibration part 19 Current measurement part 20a, 20b Plate material

Claims (6)

An agglomerated portion for aggregating dust charged by discharge using the positive electrode and dust charged by discharge using the negative electrode, the positive electrode and the negative electrode;
A discharge electrode used for discharge for charging the dust aggregated by the aggregation part;
An electric dust collector comprising: a dust collecting electrode for collecting dust charged by discharge of the discharge electrode. The electrostatic precipitator according to claim 1, further comprising a vibrating unit that applies vibration to the discharge electrode. Furthermore, a current measuring unit for measuring a current flowing through the discharge electrode is provided,
The electrostatic precipitator according to claim 2, wherein the vibration unit applies vibration to the discharge electrode when a current measured by the current measurement unit becomes smaller than a predetermined value. Furthermore, it has 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,
The electrostatic precipitator according to any one of claims 1 to 3, wherein the aggregation portion, the discharge electrode, and the dust collection electrode are arranged in this order in the predetermined direction in the flow path. The electric dust collection according to claim 4, wherein the flow path is narrower than the first position between a first position where the aggregation portion is provided and a second position where the discharge electrode is provided. apparatus. Furthermore, it comprises the board | plate material standingly arranged in the position between the 1st position in which the said aggregation part was provided, and the 2nd position in which the said discharge electrode was provided among the inner walls of the said structure. The electric dust collector as described.

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