EP3713676B1 - Charging apparatus and precipitator - Google Patents

Charging apparatus and precipitator Download PDF

Info

Publication number
EP3713676B1
EP3713676B1 EP18897739.1A EP18897739A EP3713676B1 EP 3713676 B1 EP3713676 B1 EP 3713676B1 EP 18897739 A EP18897739 A EP 18897739A EP 3713676 B1 EP3713676 B1 EP 3713676B1
Authority
EP
European Patent Office
Prior art keywords
electrode
high voltage
counter electrode
counter
charging apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18897739.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3713676A1 (en
EP3713676A4 (en
Inventor
Seiro Yuge
Manabu Takezawa
Daisuke Fukuoka
Kazutoshi Takenoshita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority claimed from PCT/KR2018/016794 external-priority patent/WO2019132554A1/en
Publication of EP3713676A1 publication Critical patent/EP3713676A1/en
Publication of EP3713676A4 publication Critical patent/EP3713676A4/en
Application granted granted Critical
Publication of EP3713676B1 publication Critical patent/EP3713676B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155—Filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/28—Plant or installations without electricity supply, e.g. using electrets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • B03C3/368—Controlling flow of gases or vapour by other than static mechanical means, e.g. internal ventilator or recycler
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/38—Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation or flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/04—Ionising electrode being a wire

Definitions

  • Embodiments of the present disclosure relate to a charging apparatus and a precipitator.
  • Air cleaners and air conditioners are equipped with a precipitator to charge suspended particles by using a discharge.
  • the precipitator includes a charger charging suspended particles by discharging, and a dust collector collecting charged suspended particles.
  • a charger of the precipitator a high voltage of several kV is applied to generate a discharge between a high voltage (discharge) electrode and a counter (ground) electrode.
  • ozone O 3
  • the ozone has a unique smell and thus when the ozone is discharged to the indoor, it is required that the ozone level is below the environmental standard (50ppb).
  • Patent document 1 discloses an electrostatic precipitator provided with an ionizing portion and a dust collector.
  • the ionizing portion has a discharging wire disposed in a direction substantially perpendicular to an airflow direction, and a ground electrode formed in a shape for transmitting the airflow, and disposed on a position, which allows a space with the discharging wire to be a charged space having uniform electric field intensity.
  • the dust collector is disposed on the downstream side of the ionizing portion in the air flow.
  • Patent document 2 discloses a precipitator provided with a supporting frame provided with an outer frame defining a hollow through-portion, an emitter electrode portion detachably provided within the outer frame of the supporting frame, and including a connecting member crossing the through-portion and having a plurality of rod electrodes connected thereto, and a collector electrode portion detachably disposed within the outer frame of the supporting frame, and including a metal plate electrode installed so as to face the arranged rod electrodes and defining a plurality of perforated holes so as to form an ionic breeze of ambient air and to collect suspended matter from the air.
  • Patent document 3 discloses a charging apparatus for an electrostatic precipitator, wherein the charging apparatus is provided with a charger charging the dust in the air by generating a corona discharge between a discharge electrode and a counter electrode opposite to the discharge electrode, and the discharge electrode is a plate shape and disposed between the counter electrodes with a distance, and the voltage is applied according to the distance.
  • JP2005-205405A discloses an electrostatic type dust collector including a discharge electrode parallel with and positioned between a pair of flat counter electrodes
  • US3747299A discloses an electrostatic precipitator
  • WO2010/038872A1 discloses an electric dust collector and electric dust collecting system
  • WO2012/144211A1 discloses an electrostatic precipitator
  • WO2017/212688A1 discloses a charging device for charging particles contained in a gas
  • EP2316575A1 discloses an electric precipitator
  • EP1434013A2 discloses an air purifier.
  • the second counter electrode may be provided such that an opening degree is higher in a leeward side than a windward side.
  • the second counter electrode may be provided such that a center of gravity of the through hole is placed on the leeward side than the high voltage electrode.
  • the second counter electrode may be formed in a plate shape such that a width thereof is narrower in the ventilation direction than the first counter electrode.
  • the second counter electrode may be disposed such that a distance between an end portion of the windward side and an end portion of the windward side of the first counter electrode is less than a distance between an end portion of the leeward side and the leeward side of the first counter electrode.
  • a ratio of the second electrode area to the first electrode area may be greater than 50% and less than 90%.
  • a diameter may be equal to or greater than 2.5% and equal to or less than 60% of a width of the second counter electrode in the ventilation direction.
  • the high voltage electrode may be disposed on the center of the ventilation direction of the first counter electrode or on the windward side.
  • the high voltage electrode may have a circular cross section having a diameter of equal to or greater than 20 ⁇ m and equal to or less than 300 ⁇ m.
  • the high voltage electrode may include a cross section in which a corner of a rectangle has an arc shape.
  • the high voltage electrode may have the arc shaped corner having a curvature radius that is 5% or greater and 50% or less of a length of a short side of the cross section.
  • the high voltage electrode may be provided such that a short side of the cross section is 50 ⁇ m or greater and 100 ⁇ m or less.
  • the high voltage may be provided such that a ratio of a length of a long side thereof exceeds 1 and equal to or less than 4 with respect to a length of the short side.
  • the high voltage electrode may include one of a metal having any one of tungsten, copper, nickel, stainless steel, zinc and iron, an oxide or an alloy containing the metal as a main component, and a material formed by plating a precious metal such as silver, gold, or platinum, on a surface of the metal or the oxide containing the metal as a main component.
  • FIG. 1 illustrates a view of an example of a precipitator 1 according to a first embodiment.
  • the precipitator 1, to which the first embodiment is applied includes a charger 10, a dust collector 20 and a fan 30, and a housing 40 accommodating the charger 10, the dust collector 20 and the fan 30.
  • the housing 40 is shown by a broken line so that the configuration of the charger 10 and the dust collector 20 provided inside the housing 40 is shown.
  • This precipitator 1 is a two-stage electrostatic dust collecting system in which functions of the charger 10 and the dust collector 20 are separated.
  • the charger 10 and the dust collector 20 may be configured as a unit type that is detachable.
  • the precipitator 1 also includes a power supplier supplying a high voltage to the charger 10 and the dust collector 20, and a controller controlling the charger 10, the dust collector 20, the fan 30 and the power supplier, but a description thereof will be omitted.
  • the charger 10 contained in the precipitator 1 to which a first embodiment is applied is an example of a charging apparatus.
  • the airflow (ventilation) direction (ventilation direction) is set in a direction toward the dust collector 20 from the charger 10 (the right side from the left side with respect to the ground of FIG. 1 , and Z direction described later).
  • the ventilation is performed by the fan 30 provided on the downstream side (leeward side) of the ventilation direction the dust collector 20.
  • the charger 10 is provided with a plurality of high voltage electrodes 110 and a plurality of counter electrodes 120 respectively facing the plurality of high voltage electrodes 110.
  • the high voltage electrode 110 represents an electrode to which a high voltage is applied and thus is referred to as "high- voltage electrode”.
  • the high voltage electrode 110 is an electrode generating a discharge and thus referred to as “discharge electrode”. Since there is a case in which the counter electrode 120 is grounded (GND), the counter electrode 120 may be referred to as "ground electrode"
  • the high voltage electrode 110 is formed of a wire-shaped member having conductivity.
  • the counter electrode 120 is formed of a plate-shaped member having conductivity.
  • the counter electrode 120 is installed such that a plane of the plate-shaped member is along the ventilation direction.
  • FIG. 1 illustrates that the plane of the counter electrode 120 is aligned with the ventilation direction (i.e., an angle between the plane of the counter electrode 120 and the ventilation direction is zero), but is not limited thereto. Therefore, it is appropriate that an angle between the plane of the counter electrode 120 and the ventilation direction is less than 90°.
  • the counter electrode 120 has a different shape with respect to a single sheet. That is, an even-numbered counter electrode 120 along the X direction has an opening 130, and an area of a portion functioning as the electrode (hereinafter referred to as "electrode area”) is small, in comparison with an odd-numbered counter electrode 120. In other words, the counter electrodes 120 having different electrode areas are alternately arranged in the direction intersecting with the ventilation direction.
  • an odd-numbered counter electrode 120 refers to a counter electrode 120A (in some cases referred to as "A") and an even -numbered counter electrode 120 refers to a counter electrode 120B (in some cases referred to as "B").
  • an opening 130 is configured by a through hole 131 which will be described later. Since the counter electrode 120B is provided with the through hole 131, the counter electrode 120B has the electrode area less than that of the counter electrode 120A.
  • the high voltage electrode 110 is indicated by "*". Accordingly, as for the precipitator 1 of FIG. 1 , in the charger 10 of the example 1, the high voltage electrode 110 and the counter electrode 120 is arranged as A- ⁇ -B- ⁇ -A- ⁇ -B- ⁇ -A- ⁇ -B- ⁇ -A.
  • An arrangement in which the counter electrode 120 having different electrode areas is alternately arranged is referred to as “alternate arrangement” and an arrangement in which the counter electrode 120 having the same electrode area is arranged is referred to as "homogeneous arrangement"
  • the dust collector 20 is provided with a high voltage electrode 210 formed in a plate shape and coated with a film formed of an insulating material, and a counter electrode 220 formed in a plate shape having conductivity, wherein the high voltage electrode 210 and the counter electrode 220 are alternately stacked.
  • the counter electrode 220 has a shape capable of releasing the electric charge of the charged particles and the counter electrode 220 is coated with a resin film having the conductivity.
  • a space between the high voltage electrode 210 and the counter electrode 220 becomes the ventilation direction. Meanwhile, since the counter electrode 220 is grounded (GND), the counter electrode 220 may be referred to as "ground electrode”.
  • a high voltage of direct current (DC) is applied between the high voltage electrode 210 and the counter electrode 220.
  • the suspended particles charged in the charger 10 are attached to the surface of the counter electrode 220 by the static electricity. Thus, the suspended particles are collected.
  • the film formed of the insulating material covering the surface of the high-voltage electrode 210 may include polyethylene, polyethylene terephthalate (PET) and polytetrafluoroethylene (PTFE).
  • PET polyethylene terephthalate
  • PTFE polytetrafluoroethylene
  • an inlet 41 is installed in the side of the charger 10 in the upstream side (windward side) of the ventilation direction and an outlet 42 is installed in the side of the dust collector 20 in the leeward side.
  • a mesh and a grid may be installed in the inlet 41. The mesh and grid installed in the inlet 41 may prevent a user from touching the charger 10 and reduce the resistance against the ventilation.
  • a pre-filter may be installed to prevent a large-shaped particle from being introduced.
  • the fan 30 is installed in the outlet 42 installed in the housing 40 and disposed in the leeward side.
  • the airflow enters the inlet 41 in the side of the charger 10 of the housing 40, passes through the charger 10 and the dust collector 20 and then comes out of the outlet 42 of the housing 40 in which the fan 30 is installed.
  • the ventilation direction is set as a Z direction, and directions perpendicular to the Z direction are set as a X direction and a Y direction.
  • the precipitator 1 may be placed in any direction.
  • the housing 40 is formed of resin material such as acrylonitrile, butadiene, styrene copolymer (ABS).
  • resin material such as acrylonitrile, butadiene, styrene copolymer (ABS).
  • a high voltage of direct current (DC) is applied between the high voltage electrode 110 and the counter electrode 120. Accordingly, a corona discharge occurs between the high voltage electrode 110 and the counter electrode 120. Ions generated by the corona discharge adhere to the suspended particulates, thereby charging the suspended particulates.
  • DC direct current
  • FIGS. 2A to 2D illustrate views of the charger 10 of the example 1 in details.
  • FIG. 2A illustrates a perspective view of the charger 10 of the example 1
  • FIG. 2B illustrates a cross-sectional view (a cross-sectional view in the Y direction) of the charger 10
  • FIG. 2C illustrates a side view of the counter electrode 120A
  • FIG. 2D illustrates a side view of the counter electrode 120B.
  • the charger 10 of the example 1 is provided with the high voltage electrode 110 and the counter electrodes 120A and 120B having different electrode areas.
  • the high voltage electrode 110 is formed of a tungsten wire (W) having a diameter of 90 ⁇ m. That is, a cross section of the high voltage electrode 110 is a circle.
  • the high voltage electrode 110 may be a metal such as copper, nickel, stainless steel, zinc, iron, or an alloy containing the metal as a main component.
  • the high voltage electrode 110 may be formed by plating a precious metal such as silver, gold, or platinum, on a surface of the metal or the alloy or the oxide containing the metal as a main component.
  • the high voltage electrode 110 may be stable.
  • a diameter of the high voltage electrode 110 may be equal to or greater than 20 ⁇ m and equal to or less than 300 ⁇ m.
  • the counter electrode 120A has a plate shape without the opening 130.
  • the counter electrode 120B has the opening 130 and the opening 130 is provided with the through hole 131.
  • the counter electrode 120A without the through hole 131 and the counter electrode 120B having the through hole 131 are arranged (disposed) in the alternate arrangement.
  • the counter electrode 120A and the counter electrode 120B are arranged as A - ⁇ -B- ⁇ -A- ⁇ -B- ⁇ -A. This is simply indicated by "AB". Other examples will be described in the same manner.
  • the opening 130 refers to all of the through hole 131 on the counter electrode 120B.
  • FIGS. 1 and 2D illustrate the opening 130 surrounding the through hole 131.
  • the counter electrode 120A and 120B is formed of aluminum.
  • the counter electrode 120 may be formed of metal such as stainless steel (SUS), and nickel alloy, or carbon.
  • a width (WA and WB) corresponding to a Z-direction length of the counter electrode 120A and 120B is 10mm.
  • the width (WA and WB) may be less than 10mm or greater than 10mm.
  • the size of the charger 10 may be reduced.
  • a length (a Y-direction length) of the counter electrode 120 may be selected based on the size of the precipitator 1. For example, the length (a Y-direction length) is 400mm.
  • the counter electrode 120A has a plate-shape without the opening 130.
  • the counter electrode 120B has the opening 130.
  • a plurality of through holes 131 arranged in the Y direction is installed in a row in the opening 130.
  • a plane shape of the through hole 131 is circular.
  • the through hole 131 has a diameter (dB) of 3mm (3mm ).
  • the plane shape of the through hole 131 may have various shapes such as an oval or a quadrangle.
  • the through hole 131 may have a shape preventing the electric field from being concentrated.
  • An outer shape of the counter electrode 120A and 120B is the same. Therefore, a ratio between an area of all of the through hole 131 (the opening 130) of the counter electrode 120 and the outer surface area of the counter electrode is indicated by an opening ratio or simply indicated by a ratio. That is, when the through hole 131 is not provided, the counter electrode 120A has an opening ratio (ratio) of 0%. On the other hand, the counter electrode 120B has an opening ratio (ratio) that is obtained by the area of the through hole 131. In the example 1, the counter electrode 120B has an opening ratio (ratio) of 13. 8%.
  • the high voltage electrode 110 is installed in the windward side (-Z direction side) with respect to a width direction (Z direction) of the counter electrode 120.
  • the high voltage electrode 110 is installed in a position, which is from an end portion of the windward side by a distance (DF) and from an end portion of the leeward side by a distance (DB), in the width direction of the counter electrode 120.
  • DF+DB WA or WB.
  • DF: DB is 3:7.
  • the position of the high voltage electrode 110 is not limited thereto, and thus the high voltage electrode 110 may be installed in another position. As described above, a reason to install the high voltage electrode 110 out of the windward side of the high voltage electrode 110 with respect to the width direction of the counter electrode 120 will be described later.
  • a distance (DG) between the high voltage electrode 110 and the counter electrode 120A and 120B is 10mm.
  • FIGS. 3A and 3B illustrate views of a charger 10 of the comparative example 1.
  • FIG. 3A illustrates a perspective view of the charger 10, and
  • FIG. 3B illustrates a cross-sectional view (a cross-sectional view in the Y direction) of the charger 10.
  • all of the counter electrodes 120 correspond to the counter electrode 120A illustrated in FIG. 2C .
  • the charger 10 of the comparative example 1 illustrated in FIG. 3 A corresponds to a configuration in which the counter electrode 120A ("A") is substituted for the counter electrode 120B ("B") of the example 2 of FIG. 2A .
  • the counter electrode 120 is arranged in the homogeneous arrangement of A-*-A-*-A-*-A. This is simply indicated by AA.
  • FIG. 4 is a table illustrating dust collection efficiency and an ozone concentration with the respective discharge currents in the example 1, the comparative example 1, other example and comparative example.
  • the dust collection efficiency and the ozone concentration are measured with different discharge currents of the charger 10.
  • the high voltage electrode 110 is formed of the tungsten wire having a diameter of 90 ⁇ m (circular cross section).
  • a voltage between the high voltage electrode 210 and the counter electrode 220 of the dust collector 20 is 6kV. Further, a wind speed of ventilation direction is set to 1m/s.
  • the discharge current is set to 150 ⁇ A, 250 ⁇ A and 450 ⁇ A.
  • the dust collection efficiency (%) is measured by counting the number of suspended particulates using a particle counter, before entering the upstream side (the charger 10) of the ventilation direction of the precipitator 1 and after discharging from the downstream side (the dust collector 20).
  • the ozone concentration (ppb) is measured at the downstream side of the ventilation direction of the precipitator 1 (after discharging from the dust collector 20) by using an ozone meter.
  • the counter electrode 120 is arranged in the alternate arrangement (AB), and as for the comparative example 1, the counter electrode 120 is arranged in the homogeneous arrangement (AA).
  • the counter electrode 120 of the charger 10 is arranged such that an example 2 is an AC type alternate arrangement, an example 3 is an AD type alternate arrangement, an example 4 is an AE type alternate arrangement, an example 5 is an AF type alternate arrangement, an example 6 is an AG type alternate arrangement, and an example 7 is an AH type alternate arrangement. That is, according to the examples 1 to 7, the counter electrode 120 has the alternate arrangement (disposition) having different shapes (different electrode areas).
  • FIGS. 5A to 5D illustrate side views of other counter electrode 120C, 120D, 120E, 120F, 120G, and 120H.
  • FIG. 5A illustrates the counter electrode 120C
  • FIG. 5B illustrates the counter electrode 120D
  • FIG. 5C illustrates the counter electrode 120E, 120F, and 120G
  • FIG. 5D illustrates the counter electrode 120H.
  • the through hole 131 having a diameter of 3 mm (3mm ) is provided in two rows in a zigzag pattern in the Y direction. Therefore, the through hole 131 is provided on the entire surface of the counter electrode 120C. In this case, the opening ratio is 27.6%.
  • the counter electrode 120D is configured by a cut-out portion 132 installed in the leeward side (Z direction). That is, the counter electrode 120D is configured such that a part of the counter electrode 120A is cut-out.
  • an end portion of the windward side of the counter electrode 120D is at the same position with respect to an end portion of the windward side of the counter electrode 120A and the Z direction (on the Z axis).
  • An end portion of the leeward side of the counter electrode 120D is placed in a short position (a position with a small coordinate value) with respect to an end portion of the leeward side of the counter electrode 120D and the Z direction (on the Z axis).
  • a depth (dw) of the cut-out portion 132 is set as 5mm. Therefore, the opening ratio is 50%.
  • the counter electrode 120D may be formed by a metal having a width obtained by subtracting the depth (dw) of the cut-out portion 132 from the width (WB). That is, a width of the counter electrode 120D in the ventilation direction may be narrower than the width of the counter electrode 120A in the ventilation direction.
  • the opening ratio is set by adjusting the depth (dw).
  • a plurality of through-holes 131 having a diameter (dB) is provided on the entire surface of the counter electrode 120 in the same as the counter electrode 120C of FIG. 5A .
  • a through-hole 131 having a diameter (dB) of 0. 25 mm (0.25mm ) is installed in the counter electrode 120E.
  • An opening ratio of the counter electrode 120E is 10 %.
  • a through-hole 131 having a diameter (dB) of 0. 75 mm (0.75mm ) is installed in the counter electrode 120F.
  • An opening ratio of the counter electrode 120F is 36 %.
  • a through-hole 131 having a diameter (dB) of 1. 5 mm (1.5mm ) is installed in the counter electrode 120G.
  • An opening ratio of the counter electrode 120G is 50 %.
  • a through-hole 131 having a diameter (dB) of 6 mm (6mm ) is installed in the leeward side, in the same arrangement as the counter electrode 120B of FIGS. 2A and 2D .
  • the counter electrode 120 of the charger 10 is configured such that the comparative example 2 is a BB type homogeneous arrangement and the comparative example 3 is a CC type homogeneous arrangement. That is, according to the comparative examples 1 to 3, the counter electrode 120 having the same shape (the same electrode area) is arranged in the homogeneous arrangement.
  • the counter electrode 120B is illustrated in FIG. 2D and the counter electrode 120C is illustrated in FIG. 5A .
  • FIG. 6A and FIG. 6B are graphs illustrating discharge current dependency of the dust collection efficiency, and a relationship between the dust collection efficiency and the ozone concentration in the example 1 (AB), the example 5 (AF), and the comparative example 1 (AA) and the comparative example 2 (BB).
  • FIG. 6A illustrates discharge current dependency of the dust collection efficiency
  • FIG. 6B illustrates a relationship between the dust collection efficiency and the ozone concentration.
  • a horizontal axis represents a discharge current ( ⁇ A)
  • a vertical axis represents dust collection efficiency (%).
  • a horizontal axis represents an ozone concentration (ppb)
  • a vertical axis represents dust collection efficiency (%).
  • the dust collection efficiency is increased with the discharge current. However, if the discharge current is not 450 ⁇ A, the dust collection efficiency does not reach 99%.
  • the dust collection efficiency is higher than the comparative example 1 (AA) with the discharge current at a low range.
  • the discharge current is not 450 ⁇ A, the dust collection efficiency does not reach 99%.
  • the dust collection efficiency is more likely to be improved with the discharge current in the low range.
  • the effect is small.
  • the dust collection efficiency is more likely to be improved with the discharge current in the low range, in comparison with the comparative example 1 (AA) and the comparative example 2 (BB).
  • a discharge current is 150 ⁇ A
  • the dust collection efficiency of 98.88% is obtained.
  • the greater improvement of dust collection efficiency is not expected in the low range of 300 ⁇ A or less although the counter electrode 120B in which the opening 130 (the through hole 131) is installed in the leeward side, is arranged in the homogeneous arrangement, which is used in the example 1(AB).
  • the example 1 (AB) and the example 5 (AF) using the alternate arrangement it is observed that the example 1 (AB) using the counter electrode 120B in which the opening 130 (the through hole 131) is installed in the leeward side, has an improved dust collection efficiency even at the low discharge current of 150 ⁇ A, in comparison with the example 5 (AF) in which the opening 130 (the through hole 131) is installed on the entire surface.
  • FIG. 7 is a graph illustrating a relationship between an opening ratio (ratio) and the dust collection efficiency with the respective discharge current in the examples 1, 2, and 3, in which a counter electrode having the opening 130 is arranged (disposed) in an alternate arrangement, and the comparative example 1.
  • a horizontal axis represents a ratio (%) and a vertical axis represents dust collection efficiency (%).
  • the discharge current is set as 150 ⁇ A, 250 ⁇ A, and 450 ⁇ A.
  • the comparative example 1 (AA) has a ratio of 0%.
  • the counter electrode 120B of the example 1 (AB) is provided such that the through hole 131 of 3mm is provided in the opening 130 in the leeward side, and its ratio is 13.8%.
  • the counter electrode 120C of the example 2 (AC) is provided such that the through hole 131 of 3mm is provided on the entire surface, and its ratio is 27.6%.
  • the counter electrode 120D of the example 3 (AD) is provided with the cut-out portion 132 on the leeward side, and its ratio is 50%.
  • the example 1 (AB), the example 2 (AC) and the example 3 (AD) in which the counter electrode 120 having the opening 130 is arranged (disposed) in the alternate arrangement has the high dust collection efficiency with the low discharge current (e.g.,150 ⁇ A), in comparison with the comparative example 1 (AA) without the opening 130.
  • the opening ratio (ratio) is 10% or more and 50% or less, the dust collection efficiency is improved with the low discharge current (e.g., 150 ⁇ A).
  • the example 1 (AB) having the ratio of 13.8% and the example 3 (AD) having the ratio of 50% have the high dust collection efficiency with the low discharge current, in comparison with the example 2 (AC) having the ratio of 27.6%, it is observed that the dust collection efficiency is not always improved although the opening ratio (ratio) is increased. It is observed that it is appropriate that the opening 130 (the through hole 131) or the cut-out portion 132 is installed in the leeward side. As for the opening 130, when a ratio of the through hole 131 per unit area is referred to as "opening degree", it is observed that an opening degree of the leeward side is higher than an opening degree of the windward side.
  • the through hole 131 may be installed such that the opening degree is increased from the windward side to the leeward side.
  • the through hole 131 may be provided such that the diameter (dB) is increased from the windward side to the leeward side with a predetermined interval or the number of the through hole 131 is increased from the windward side to the leeward side.
  • a distance between an end portion in the windward side of the counter electrode 120D and an end portion in the windward side of the counter electrode 120A may be less than a distance between an end portion in the leeward side of the counter electrode 120D and an end portion in the leeward side of the counter electrode 120A.
  • FIG. 8 is a graph illustrating a relationship between an opening ratio (ratio) and the dust collection efficiency with the respective discharge current in the examples 1, 4, 5 and 6 in which the counter electrode having the opening including through holes having different diameters (dB), is arranged (disposed) in the alternate arrangement, and in the comparative example 1.
  • a horizontal axis represents a ratio (%) and a vertical axis represents dust collection efficiency (%).
  • the discharge current is set as 150 ⁇ A, 250 ⁇ A, and 450 ⁇ A.
  • the comparative example 1 (AA) does not have the through hole 131 and thus its ratio is 0%.
  • the counter electrode 120E of example 4 (AE) is provided such that the through hole 131 having a diameter (dB) of 0.25 mm is disposed on the inner surface, and its ratio is 10%.
  • the counter electrode 120B of example 1 (AB) is provided such that the through hole 131 having a diameter (dB) of 3 mm is provided in the leeward side, and its ratio is 13.8%.
  • An example indicating a ratio of 18% which is not shown in FIG. 4 , is provided such that the through hole 131 having a diameter (dB) of 0.5 mm is disposed on the enter surface.
  • the counter electrode 120F of example 5 is provided such that the through hole 131 having a diameter (dB) of 0.75 mm is disposed on the enter surface, and its ratio is 36%.
  • the counter electrode 120D of example 6 (AD) is provided such that the through hole 131 having a diameter (dB) of 1.5 mm is disposed on the enter surface, and its ratio is 50%.
  • the example 1 (AB), the example 4 (AE), the example 5 (AF), the example 6 (AD) and a case having the ratio of 18% have the alternate arrangement.
  • the dust collection efficiency is improved, as the diameter (dB) of the through hole 131 is increased.
  • the diameter (dB) of the through hole 131 of the opening 130 indicating the improved dust collection efficiency is equal to or greater than 2.5% and equal to or less than 60% with respect to the width (WB) of the ventilation direction of the counter electrode 120.
  • the opening ratio making the improvement of the dust collection efficiency is equal to or greater than 10% and equal to or less than 50%.
  • the depth (dw) of the cut-out portion 132 may be 10% or more and 50% or less of the width (WB) of the counter electrode 120D. That is, the ratio of the electrode area of the counter electrode 120D with respect to the counter electrode 120A may be set to more than 50% and less than 90%.
  • the counter electrode 120 in which the opening 130 is disposed in the leeward side is arranged (disposed) in the alternate arrangement, such as the example 1 (AB), the example 3 (AD), and the example 7 (AH), and the case in which the counter electrode 120 in which the opening 130 is disposed on the entire surface, is arranged (disposed) in the alternate arrangement, such as the example 2 (AC), the example 4 (AE), the example 5(AF) and the example 6 (AG), have been described.
  • FIG. 9 is a table illustrating dust collection efficiency and an ozone concentration with the respective discharge current of a precipitator having the counter electrode of the charger 10, and the charger 10 in the comparative example 1 and comparative examples 4 and 5.
  • the comparative example 1 is that the counter electrode 120 is arranged in the AA type homogeneous arrangement.
  • a comparative example 4 is an AB' type alternate arrangement
  • a comparative example 5 is an AD' type alternate arrangement.
  • the discharge current is set as 150 ⁇ A, 250 ⁇ A, and 450 ⁇ A.
  • FIG. 10A and FIG. 10B are side views illustrating the counter electrode 120B' and 120D' of the comparative examples 4 and 5.
  • FIG. 10A illustrates the counter electrode 120B' according to the comparative example 4
  • FIG. 10B illustrates the counter electrode 120D' according to the comparative example 5.
  • the counter electrode 120B' of FIG. 10A is provided such that the through hole 131 having a diameter (dB) of 3mm (3mm ) is arranged in the Y direction in a row in the leeward side. That is, the counter electrode 120B' has a configuration in which the windward side and the leeward side of the counter electrode 120D illustrated in FIG. 2D are switched to each other. In this case, its ratio is 13.8%.
  • the counter electrode 120D' of FIG. 10B is provided such that the opening 130 is configured by a cut-out portion 132' installed in the leeward side. That is, the counter electrode 120D' has a configuration in which the windward side and the leeward side of the counter electrode 120D illustrated in FIG. 5D are switched to each other. In this case, its ratio is 50%.
  • the opening ratio of the comparative example 1 (AA) is 0%.
  • FIG. 11 is a graph illustrating a relationship between an opening ratio (ratio) and the dust collection efficiency with the respective discharge current in the comparative examples 4 (AB') and 5 (AD') in which the counter electrode in which the opening is arranged (disposed) in an upstream, is disposed in the alternate arrangement and in the comparative example 1 (AA).
  • a horizontal axis represents a ratio (%) and a vertical axis represents dust collection efficiency (%).
  • the discharge current is set as 150 ⁇ A, 250 ⁇ A, and 450 ⁇ A.
  • FIG. 11 it is observed that it does not follow the discharge current and the improvement of the dust collection efficiency does not occur, although the opening 130 (the through hole 131) and the cut-out portion 132 are installed in the windward side as illustrated in the comparative example 4 (AB') and the comparative example 5 (AD'), in comparison with the comparative example 1 without the opening 130. This is because the counter electrode 120 is not present at a portion facing the high voltage electrode 110 and the electric field is hardly applied to the portion.
  • the center of gravity of the through hole 131 is located on the leeward side of the high voltage electrode 110 when the opening 130 is configured by the through hole 131.
  • the center of gravity of the through hole 131 refers to not a hole of the through hole 131, but the center of gravity of the plate-shaped member. When the plane shape of the through hole 131 is a circle, the center of gravity of the through hole 131 becomes the center of the through hole 131.
  • the improvement of the dust collection efficiency at the low discharge current is due to an increase in the number of generated ions (the number of ions) at the low discharge current. That is, it is considered that the improvement of the dust collection efficiency is due to an increase in the number of generated ions, and thus the number of suspended particles, to which ions are attached, is increased and the dust collection efficiency is improved.
  • the number of generated ions (the number of ions) generated from the charger 10 is measured in the example 1 (AB), the example 3 (AD) and the comparative example 1 (AA).
  • the counter electrode 120 in which the opening 130 is disposed on the leeward side is arranged in the alternate arrangement.
  • the comparative example 1 (AA) is a case in which the counter electrode 120 without the opening 130 is arranged in the homogeneous arrangement.
  • the number of ions generated from the charger 10 is measured under a condition that the dust collector 20 is not provided in the precipitator 1.
  • the number of ions generated in the charger 10 is measured by an ion counter provided at a position 30cm in the leeward side from the charger 10 at a wind speed of 1 m/sec.
  • FIG. 12 is a graph illustrating a relationship between the measured number of ions and the discharge current in the charger 10 in the example 1 (AB), the example 3 (AD) and the comparative example 1 (AA).
  • a horizontal axis represents a discharge current ( ⁇ A) and a vertical axis represents the number of ions (X 1000 ions / cm 3).
  • the ion number of the vertical axis is an average value of measured number of ions obtained by performing sampling every 10 seconds for 10 minutes at the discharge currents of 150 ⁇ A, 250 ⁇ A, 350 ⁇ A and 450 ⁇ A.
  • the number of ions increases by arranging the counter electrodes 120, in which the opening 130 is arranged on the leeward side, in the alternate arrangement.
  • the ions are generated in a discharge space in the extreme vicinity of the high voltage electrode 110.
  • the ions move downstream along the ventilation.
  • the ions adhere to the suspended particulates, and the suspended particulates are charged. Therefore, as the number of ions is increased, the number of charged suspended particulates is also increased. As the number of charged suspended particulates increases, the dust collection efficiency is improved.
  • the high voltage electrode 110 has the same configuration. That is, the high voltage electrode 110 is a tungsten wire having a diameter of 90 ⁇ m.
  • the opening 130 is provided in the leeward side. That is, the portion of the counter electrode 120 that is not the opening 130 is opposed to the vicinity of the high voltage electrode 110.
  • the distance (DG) between the high voltage electrode 110 and the counter electrode 120 is also equal to 10 mm. Accordingly, it is considered that there is no difference in the discharge volume of the discharge generated in the extreme vicinity of the high voltage electrode 110 in the example 1 (AB), the example 3 (AD) and the comparative example 1 (AA). That is, it is considered that there is no difference in the number of generated ions.
  • the number of ions measured on the leeward side is different in the example 1 (AB), the example 3 (AD) and the comparative example 1 (AA). Accordingly, it is considered that some of the ions generated in the high voltage electrode 110 disappear before reaching the dust collector 20. That is, it is considered that the ions are electrostatically attracted and then attached to or collided with the counter electrode 120 and thus electric charge is lost (neutralized).
  • the number of ions measured on the leeward side is large in the example 1 (AB) and the example 3 (AD), in which the opening 130 is provided in the leeward side. Therefore, it is considered that the probability that the ions adhere to or collide with the counter electrode 120 is reduced by the opening 130 formed on the leeward side of the counter electrode 120.
  • the dust collection efficiency is improved, in comparison with the comparative example 1.
  • the improvement of the dust collection efficiency is not observed when the counter electrode 120 is arranged in the homogeneous arrangement.
  • the probability of charging the suspended particles is increased. Therefore, it is appropriate to dispose the high voltage electrode 110 on the windward side including the center of the counter electrode 120. Conversely, when the high voltage electrode 110 is shifted to the windward side from an end portion of the windward side of the counter electrode 120, the electric field strength in the vicinity of the high voltage electrode 110 is lowered, which is not appropriate.
  • the reason for the increase in the number of ions is that turbulence of the air flow is generated, and the residence time of the ions is increased.
  • the turbulence of the airflow is not recognized at a flow rate of 1 m/sec.
  • the number of generated ions is small.
  • the charging efficiency of the suspended particulates may be improved, and the dust collection efficiency may be increased even at the low discharging current.
  • the ozone concentration can be suppressed to a low level. That is, it is possible to simultaneously obtain the high dust collection efficiency and the suppression of the ozone concentration.
  • the first embodiment it is to provide the improvement in the dust collection efficiency at the low discharge current by suppressing the loss (neutralization) of ions generated in the discharge space around the high voltage electrode 110, by using the configuration of the counter electrode 120.
  • the structure described below is to provide a configuration of a high voltage electrode 110 that improves the dust collection efficiency at the low discharge current in which ozone occurs less.
  • FIG. 13 illustrates an example of a precipitator 2 that does not fall within the scope of the claims.
  • the precipitator 2 has a charger 10, a dust collector 20, a fan 30, and a housing 40 accommodating the charger 10, the dust collector 20, and the fan 30.
  • the precipitator 2 is the same as the precipitator 1 to which the first embodiment is applied, and therefore, the same reference numerals designate and the description is omitted.
  • the charger 10 provided in the precipitator 2 is another example of the charging apparatus.
  • the charger 10 includes a plurality of high voltage electrodes 110 and a plurality of counter electrodes 120 respectively facing the plurality of high voltage electrodes 110.
  • the high voltage electrode 111 is formed of a wire-shaped member having conductivity. Further, the high voltage electrode 111 has a cross section in which a rectangular corner portion has an arc shape. This cross-sectional shape is indicated by an oval or racing track shape.
  • the counter electrode 120 is formed of a plate-shaped member having conductivity.
  • the counter electrode 120 is installed such that a plane of the plate-shaped member is along the ventilation direction.
  • the counter electrodes 120 having the same shape (same electrode area) are arranged (disposed) in the homogeneous arrangement.
  • the counter electrode 120 is the counter electrode 120A illustrated in FIG. 2C .
  • the counter electrode 120A is not provided with the opening 130.
  • FIGS. 14A to 14C illustrate views of a charger 10 of an example 8.
  • FIG. 14A is a perspective view of the charger 10
  • FIG. 14B is a cross-sectional view (a cross-sectional view in the Y direction) of the charger 10
  • FIG. 14C is a cross-sectional view of a high electrode 111 of the example 8.
  • an oval-shaped cross section of the high voltage electrode 111 is provided such that a corner of a square has an arc shape having a radius of curvature (rw).
  • a longitudinal direction of the rectangle is defined as a length of a long side (WW) and a short direction is defined as a length of a short side (TW).
  • the high voltage electrode 111 is disposed such that the longitudinal direction of the rectangle is disposed in a direction parallel to the surface of the counter electrode 120A.
  • the longitudinal direction of the rectangle of the high voltage electrode 111 may be perpendicular to the surface of the counter electrode 120A.
  • the corona discharge occurs at a portion where the electric field is high.
  • the volume of this portion is referred to as a discharge volume.
  • the high voltage electrode 110 in a wire shape having a circular cross section (refer to FIG. 2B )
  • the electric field around the high voltage electrode 110 becomes higher and the discharge volume becomes smaller. Since the electric field is high, the number of generated ions increases, but the generation of ozone is suppressed because the discharge volume is small.
  • the diameter (dB) of the high voltage electrode 110 is made small, that is, when it is made thinner, it is difficult to handle the high voltage electrode 110.
  • the high voltage electrode 110 formed of tungsten (W) is bent, it is difficult to change the shape and the discharge characteristics are uneven.
  • the high voltage electrode 110 formed of a tungsten (W) is also easy to bend.
  • the corona discharge occurs in a portion ( ⁇ ) in which a curvature radius( rw ) of the cross section is small.
  • a portion ( ⁇ ) which is a center portion in the longitudinal direction of the rectangle the corona discharge is unlikely to occur. Therefore, by decreasing a curvature radius (rw) of a corner of the cross section, the discharge volume may be reduced, and the generation of ozone may be suppressed while increasing the number of generated ions.
  • the high voltage electrode 111 in the charger 10 of the example 8 has a curvature radius (rw) of the corner of the cross section that is 1/2 of the length of the short side (TW).
  • the length of the long side (WW) is 150 ⁇ m
  • the length of the short side (TW) is 50 ⁇ m. Accordingly, it is similar with a case, in which the high-voltage electrode 110 having the diameter having a circular cross section is divided into two, and a space therebetween is opened. That is, it is similar that the high voltage electrode 110 having a diameter of 90 ⁇ m as described in the first embodiment is changed into a diameter of 50 ⁇ m.
  • FIG. 15 is a table illustrating dust collection efficiency and an ozone concentration with the respective discharge currents of a precipitator having the high electrode 110 and 111 and the counter electrode 120 of the charger 10 and the charger 10 in the example 8, the comparative example 1, another example and other comparative examples.
  • the comparative example 1 has been described in the first embodiment.
  • Example 9 and comparative examples 6 and 7 will be described later.
  • the discharge current is set as 15 ⁇ A, 250 ⁇ A, and 450 ⁇ A.
  • FIGS. 16A to 16C are views illustrating a charger 10 of the example 9, and the comparative examples 6 and 7.
  • FIG. 16A is the example 9
  • FIG. 16B is the comparative example 6
  • FIG. 16C is the comparative example 7.
  • the example 9 is a combination of the oval shaped- high voltage electrode 111 shown in the example 8, and the counter electrodes 120A and 120B arranged in the alternate arrangement shown in the example 1 of the first embodiment.
  • the comparative example 6 uses a high voltage electrode 112 having a square cross section, instead of the high voltage electrode 111 of the example 8.
  • the high voltage electrode 112 having the square cross section is formed of stainless steel (SUS), and one side is 70 ⁇ m.
  • the comparative example 7 uses a high voltage electrode 113 having a rectangular cross section, instead of the high voltage electrode 111 of the example 8.
  • the high voltage electrode 113 having the rectangular cross section is formed of stainless steel (SUS), and a length in the longitudinal direction is 150 ⁇ m, and a length of the short direction is 50 ⁇ m.
  • the high voltage electrode 113 is disposed such that the longitudinal direction is disposed parallel to the surface of the counter electrode 120A. In the comparative examples 6 and 7, the counter electrodes 120A without the opening 130 are arranged in the homogeneous arrangement.
  • FIGS. 17A and 17B are graphs illustrating discharge current dependency of the dust collection efficiency, and a relationship between the dust collection efficiency and the ozone concentration in the example 8 (AA), the example 9 (AB), and the comparative example 1 (AA).
  • FIG. 17A illustrates the discharge current dependency of the dust collection efficiency
  • FIG. 17B illustrates a relationship between the dust collection efficiency and the ozone concentration.
  • a horizontal axis represents a discharge current ( ⁇ A)
  • a vertical axis represents dust collection efficiency (%)
  • a horizontal axis represents an ozone concentration (ppb)
  • a vertical axis represents dust collection efficiency (%).
  • the dust collection efficiency is improved even at the low range of the discharge current (150 ⁇ A and 250 ⁇ A), in comparison with the comparative example 1 (AA). That is, it can be seen that the amount of generated ions is increased by the high voltage electrode 111 having the racing track shape.
  • the dust collection efficiency is further improved in the low range of the discharge current.
  • FIGS. 18A and 18B are graphs illustrating discharge current dependency of the dust collection efficiency, and a relationship between the dust collection efficiency and the ozone concentration in the example 8 (AA), the comparative example 1 (AA), the comparative example 6 (AA) and the comparative example 7 (AA).
  • FIG. 18A illustrates the discharge current dependency of the dust collection efficiency
  • FIG. 18B illustrates a relationship between the dust collection efficiency and the ozone concentration.
  • a horizontal axis and a vertical axis are the same as FIGS. 17 A and 17B .
  • the oval-shaped corner of the high voltage electrode 111 has the arc shape and its angle is not 90 °. That is, as for the oval-shaped corner of the high voltage electrode 111 having the arc shape, it is appropriate that the arc shape has a curvature radius (rw) equal to or greater 5% and equal to or less than 50% (1/2) of the length of the short side (TW).
  • rw curvature radius
  • the length of the short side (TW) is 50 ⁇ m to 100 ⁇ m and the length of the long side (WW) is 0.6 mm to 1.0 mm. It is appropriate that the length of the long side (WW) is greater than 1 and less than 4 with respect to the length of the short side (TW).
  • the length of the short side (TW) can be made smaller (thinner), it becomes the same as using the thin high-voltage electrode 110 having a circular cross section. Further, if the length of the long side (WW) exceeds 4 with respect to the length of the short side (TW), it is difficult to process by using a wire-shaped member.
  • the high voltage electrode 111 may be formed of the same material as the high voltage electrode 110 described in the first embodiment.
  • the precipitator 1, to which the first embodiment is applied, and the precipitator 2, to which the second embodiment is applied, are provided with the dust collector 20 using the static electricity by using the high voltage electrode 210 and the counter electrode 220.
  • a precipitator 3 to which a third embodiment is applied uses a dust collection filter.
  • FIG. 19 illustrates an example of a precipitator 3 according to a third embodiment.
  • the precipitator 3 to which the third embodiment is applied has a charger 10, a dust collection filter 50, a deodorizing filter 60, a fan 30, and a housing 40 accommodating the charger 10, the dust collection filter 50, the deodorizing filter 60, and the fan 30.
  • the dust collector 20 of the precipitator 1, to which the first embodiment illustrated in FIG. 1 is applied, is replaced with the dust collection filter 50.
  • the deodorizing filter 60 may be appropriately provided on the front face (upstream side) or the back face (downstream side) of the charger 10, and the rear face (downstream side) of the dust collection filter 50.
  • the charger 10 may be the same as the charger 10 shown in the embodiment in the precipitator 1 to which the first embodiment is applied and the precipitator 2 to which the second embodiment is applied.
  • the dust collection filter 50 is a fiber filter and is electret-processed, the suspended particles charged by the charger 10 are likely to be adsorbed. Further, it is appropriate that the dust collection filter 50 has a large surface area by bending (pleat processing).
EP18897739.1A 2017-12-27 2018-12-27 Charging apparatus and precipitator Active EP3713676B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017251650A JP2019115893A (ja) 2017-12-27 2017-12-27 帯電装置及び集塵装置
KR1020180140753A KR102629969B1 (ko) 2017-12-27 2018-11-15 대전 장치 및 집진 장치
PCT/KR2018/016794 WO2019132554A1 (en) 2017-12-27 2018-12-27 Charging apparatus and precipitator

Publications (3)

Publication Number Publication Date
EP3713676A1 EP3713676A1 (en) 2020-09-30
EP3713676A4 EP3713676A4 (en) 2021-04-07
EP3713676B1 true EP3713676B1 (en) 2023-04-19

Family

ID=67225693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18897739.1A Active EP3713676B1 (en) 2017-12-27 2018-12-27 Charging apparatus and precipitator

Country Status (4)

Country Link
EP (1) EP3713676B1 (ko)
JP (1) JP2019115893A (ko)
KR (1) KR102629969B1 (ko)
CN (1) CN111542396B (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110629709A (zh) * 2019-09-23 2019-12-31 杨磊 一种除尘式道路防护板
TWI761996B (zh) * 2020-10-19 2022-04-21 馗鼎奈米科技股份有限公司 空氣淨化裝置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1434013B1 (en) * 2002-12-23 2014-09-24 Samsung Electronics Co., Ltd. Air purifier
EP2316575B1 (en) * 2009-10-28 2015-03-11 Samsung Electronics Co., Ltd. Electric precipitator and air cleaner having the same

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747299A (en) * 1972-02-04 1973-07-24 Kuan Chiang Ta Electrostatic precipitator
JPH06182255A (ja) 1992-12-17 1994-07-05 Hitachi Ltd 電気集塵器
US7724492B2 (en) * 2003-09-05 2010-05-25 Tessera, Inc. Emitter electrode having a strip shape
JP4553125B2 (ja) * 2003-12-25 2010-09-29 ミドリ安全株式会社 荷電装置、捕集装置及び静電式集塵装置
WO2005115628A1 (ja) * 2004-05-28 2005-12-08 Midori Anzen Co., Ltd. 電極および電気集塵機
FR2886870B1 (fr) * 2005-06-14 2007-09-21 Valeo Systemes Thermiques Dispositif de precipitation electrostatique de particules chargees et vehiculees dans un flux d'air
JP4633024B2 (ja) * 2006-09-12 2011-02-16 三菱電機株式会社 空気清浄機
JP2009106827A (ja) * 2007-10-29 2009-05-21 Daikin Ind Ltd 空気処理装置
JP5213568B2 (ja) 2008-07-24 2013-06-19 三菱電機株式会社 電気集塵用荷電装置
WO2010038872A1 (ja) * 2008-10-03 2010-04-08 ミドリ安全株式会社 電気集塵装置及び電気集塵システム
KR101610854B1 (ko) * 2008-12-11 2016-04-21 삼성전자 주식회사 전기집진장치 및 그 고전압 전극
WO2011034326A2 (ko) 2009-09-16 2011-03-24 (주)선재하이테크 부유물 포집장치
JP5816810B2 (ja) * 2011-04-22 2015-11-18 パナソニックＩｐマネジメント株式会社 電気集塵装置
FI124675B (fi) * 2012-09-06 2014-11-28 Tassu Esp Oy Menetelmä pienhiukkasten keräämiseksi savukaasuista sekä vastaava sovitelma
JP2017013041A (ja) * 2014-12-22 2017-01-19 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 電気集塵機
WO2017212688A1 (ja) * 2016-06-06 2017-12-14 パナソニックＩｐマネジメント株式会社 荷電装置、電気集塵機、換気装置及び空気清浄機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1434013B1 (en) * 2002-12-23 2014-09-24 Samsung Electronics Co., Ltd. Air purifier
EP2316575B1 (en) * 2009-10-28 2015-03-11 Samsung Electronics Co., Ltd. Electric precipitator and air cleaner having the same

Also Published As

Publication number Publication date
KR102629969B1 (ko) 2024-01-29
CN111542396A (zh) 2020-08-14
EP3713676A1 (en) 2020-09-30
JP2019115893A (ja) 2019-07-18
CN111542396B (zh) 2022-06-14
EP3713676A4 (en) 2021-04-07
KR20190079496A (ko) 2019-07-05

Similar Documents

Publication Publication Date Title
AU2008320310B2 (en) Charging device, air handling device, method for charging, and method for handling air
AU2008320311B2 (en) Air handling device
US10518270B2 (en) Dust collector and air conditioner
EP3713676B1 (en) Charging apparatus and precipitator
JP2009072772A (ja) 電気集塵装置
US11331678B2 (en) Charging apparatus and precipitator
US20230140445A1 (en) Electrostatic separator
CN106642324B (zh) 空调室内机
EP3932563A1 (en) Charging device and dust collecting apparatus
JP2017131875A (ja) 電気集塵装置
JP2006224054A (ja) 電気集塵ユニット
JP7300298B2 (ja) 帯電装置及び集塵装置
JP5098885B2 (ja) 荷電装置及び空気処理装置
CN218182165U (zh) 电离装置
JP7358216B2 (ja) 電気集塵装置
JP2009061444A (ja) 静電式集塵装置及び荷電装置
JP2020078516A (ja) 空気清浄装置
CN211914186U (zh) 用于从空气流中分离空气传播粒子的空气净化设备
CN211914183U (zh) 用于从空气流中分离空气传播粒子的空气净化设备
CN107737671B (zh) 静电除尘模块及空气调节装置
CN108344038B (zh) 空调室内机
KR20220099441A (ko) 전기집진장치용 빗살형 이오나이저
JP2002239412A (ja) 気体清浄装置
JP2022147333A (ja) 荷電装置及び空気清浄機
JPH0636876B2 (ja) イオン風式空気清浄器

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20200624

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RIC1 Information provided on ipc code assigned before grant

Ipc: B03C 3/28 20060101ALI20201127BHEP

Ipc: B03C 3/47 20060101ALI20201127BHEP

Ipc: B03C 3/12 20060101ALI20201127BHEP

Ipc: B03C 3/68 20060101ALI20201127BHEP

Ipc: B03C 3/40 20060101AFI20201127BHEP

Ipc: B03C 3/155 20060101ALI20201127BHEP

Ipc: B03C 3/36 20060101ALI20201127BHEP

Ipc: B03C 3/41 20060101ALI20201127BHEP

Ipc: B03C 3/38 20060101ALI20201127BHEP

Ipc: B03C 3/08 20060101ALI20201127BHEP

A4 Supplementary search report drawn up and despatched

Effective date: 20210310

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RIC1 Information provided on ipc code assigned before grant

Ipc: B03C 3/68 20060101ALI20210303BHEP

Ipc: B03C 3/36 20060101ALI20210303BHEP

Ipc: B03C 3/40 20060101AFI20210303BHEP

Ipc: B03C 3/41 20060101ALI20210303BHEP

Ipc: B03C 3/12 20060101ALI20210303BHEP

Ipc: B03C 3/28 20060101ALI20210303BHEP

Ipc: B03C 3/47 20060101ALI20210303BHEP

Ipc: B03C 3/155 20060101ALI20210303BHEP

Ipc: B03C 3/08 20060101ALI20210303BHEP

Ipc: B03C 3/38 20060101ALI20210303BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

INTG Intention to grant announced

Effective date: 20230214

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602018048754

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1560802

Country of ref document: AT

Kind code of ref document: T

Effective date: 20230515

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20230419

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1560802

Country of ref document: AT

Kind code of ref document: T

Effective date: 20230419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230821

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230719

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230819

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230720

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231120

Year of fee payment: 6

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602018048754

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230419

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20231120

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20240122