WO2010038872A1 - Appareil et systeme electriques de collecte de poussiere - Google Patents

Appareil et systeme electriques de collecte de poussiere Download PDF

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Publication number
WO2010038872A1
WO2010038872A1 PCT/JP2009/067264 JP2009067264W WO2010038872A1 WO 2010038872 A1 WO2010038872 A1 WO 2010038872A1 JP 2009067264 W JP2009067264 W JP 2009067264W WO 2010038872 A1 WO2010038872 A1 WO 2010038872A1
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Prior art keywords
electrode
dust
unit
air
dust collection
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PCT/JP2009/067264
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English (en)
Japanese (ja)
Inventor
友則 津森
直記 杉田
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ミドリ安全株式会社
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Publication of WO2010038872A1 publication Critical patent/WO2010038872A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20181—Filters; Louvers
    • 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
    • B03C3/09—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles 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
    • B03C3/34—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
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/51—Catch- space electrodes, e.g. slotted-box form
    • 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
    • B03C2201/06—Ionising electrode being a needle

Definitions

  • the present invention relates to an electrostatic precipitator and an electrostatic precipitator system that collect dust by charging particles such as dust floating in the air.
  • a charge neutralization means is provided on the downstream side of the dust collecting section, and the discharge of the charge neutralization means is performed.
  • an electric dust collector including a charging unit that charges sucked dust by corona discharge and a dust collecting unit that collects the charged dust by electrostatic force is used. .
  • the neutralization unit is provided integrally on the downstream side of the dust collection unit, the neutralization unit is in a state that matches the size (duct diameter) and performance (air volume, etc.) of the electrostatic precipitator. Since it is necessary to generate static elimination ions, there is a problem that the static elimination portion becomes unnecessarily large and expensive.
  • the balance between the charge amount of the particles exiting the dust collection portion and the charge-removing ions may be balanced, but the dust collection portion (particularly between the dust collection electrode and the counter electrode). If particles (dust) adhere to and accumulate on the wall of the member that supports the insulation between the two electrodes, the insulation resistance between the two electrodes decreases, thereby reducing the dust collection voltage (dust collection capability) between the two electrodes. As a result, the amount of charged particles exiting the dust collecting portion increases. For this reason, there exists a problem that a charged particle adheres to a downstream apparatus etc. and it charges.
  • the present invention has been made in view of the above-described problems of the prior art, and the first object thereof is to efficiently remove all of the charged particles that have escaped from the dust collection portion with high probability when passing the charge removal portion, and An object of the present invention is to provide an electrostatic precipitator that can always remove (neutralize) the charged particles that have flowed out of the dust collecting portion in a well-balanced manner regardless of dirt on the dust collecting portion.
  • a second object is to provide an electric dust collection system that has high dust collection and charge removal performance and that can be reduced in size and cost.
  • the electrostatic precipitator according to the first aspect of the present invention is provided in order in the air flow direction, a charging unit that applies a charge to particles in the air, and a dust collector that collects particles charged by the charging unit.
  • the charging unit includes a plurality of discharge units provided in parallel on a plane orthogonal to the air flow direction.
  • a dust collecting part is provided by installing a masking plate that regulates the air flow on the upstream side of the static eliminating part and allowing all passing particles to pass through the positive / negative bipolar ion shower space for static elimination. All of the charged particles that have escaped can be efficiently neutralized with high probability when passing through the neutralization unit.
  • the static elimination unit includes a linear static elimination electrode provided in parallel with the discharge line of the charging unit, and an air flow direction orthogonal to the static elimination electrode. And a second counter electrode provided at a predetermined interval at opposite positions on the surface.
  • the static elimination electrode as a static elimination wire, more static elimination ions can be efficiently generated.
  • the masking plate of the second aspect is suitable for application to such a charge removal portion.
  • the charge removal unit includes a needle-shaped charge removal electrode provided on a surface parallel to the discharge line of the charge unit and a needle-shaped charge removal electrode sandwiched between the charge removal electrode. And a plate-like second counter electrode provided at a predetermined interval at opposite positions on a plane orthogonal to the air flow direction.
  • the masking plate used in the third aspect is also suitable for application to such a charge removal portion.
  • the static eliminator includes a plurality of static elimination electrodes provided on a plane perpendicular to the air flow direction, and a plane perpendicular to the air flow direction with the static elimination electrode interposed therebetween.
  • a third counter electrode having a plurality of ventilation holes arranged at a predetermined interval at least at one position upstream and downstream is provided.
  • the masking plate used in the fourth aspect is also suitable for application to such a charge removal portion.
  • the third counter electrode provided on the surface orthogonal to the air flow direction has a plurality of ventilation holes on the surface thereof, and allows the charged particles to sufficiently pass therethrough and is opposed thereto. It also functions stably as a third counter electrode dedicated for causing corona discharge in the static elimination electrode.
  • the third counter electrode when the third counter electrode is provided between the dust collection portion and the charge removal electrode, it also serves to block the electric field from the charge removal electrode from reaching the dust collection portion. It is possible to provide the charge removal unit close to the dust collection unit, and the apparatus can be downsized while maintaining high dust collection performance and charge removal performance.
  • a third counter electrode is provided on each of the upstream and downstream sides of the static elimination electrode, and the neutralization electrode is decentered from the center between the counter electrodes, for example, close to the third counter electrode side on the downstream side Place in position.
  • an AC high voltage is applied to the static elimination electrode.
  • positive and negative ions are alternately emitted from the static elimination electrode, so that the ion balance amplitude is kept small not only for the charged particles that have escaped the dust collection part but also for the equipment downstream of the static elimination part. Efficient charge removal.
  • the sixth aspect is that in the first to fourth aspects, a high-polarity DC high voltage is applied to the static elimination electrode.
  • a high-polarity DC high voltage is applied to the static elimination electrode.
  • the charged particles that have escaped from the dust collecting portion can be efficiently neutralized, so that cooling is efficiently performed without charging the flow path downstream of the neutralization portion, equipment, and the like. it can.
  • An electric dust collector includes a charging unit that is provided in order in a flow direction of air, and that applies a charge to particles in the air, and a dust collecting unit that collects particles charged by the charging unit. And an electrostatic precipitator that neutralizes the charged particles that have exited the dust collecting unit by generating ions having a polarity opposite to that of the charged unit, and a detection unit that detects a voltage of the dust collecting unit electrode; And a control means for generating a DC voltage capable of generating an amount of ions balanced with the amount of charge of the charged particles exiting the dust collection section based on the voltage detected by the detection means and applying the DC voltage to the neutralization section electrode. It is.
  • the neutralization unit has a reverse polarity ion in an amount balanced with the charge amount of the charged particles exiting the dust collection unit based on the detection voltage of the dust collection unit electrode that changes according to the dirt of the dust collection unit. Therefore, it is possible to always remove (neutralize) the charged particles that have passed through the dust collecting portion in a well-balanced manner regardless of the dirt on the dust collecting portion.
  • the eighth aspect is provided in order in the air flow direction, and includes a charged portion that applies a charge to particles in the air, a dust collecting portion that collects particles charged by the charged portion, and the dust collecting portion.
  • the electrostatic precipitator provided with a neutralizing unit that neutralizes the charged particles by generating ions having a polarity opposite to that of the charged unit, a detecting unit that detects a current flowing in the dust collecting unit electrode, and the detecting unit detects And a control unit that generates a DC voltage capable of generating an amount of ions balanced with the amount of charge of the charged particles exiting the dust collection unit based on the current, and applies the DC voltage to the neutralization unit electrode.
  • the charge removal portion is based on the detected current of the current flowing through the dust collection portion electrode that changes according to the dirt of the dust collection portion, and is an amount balanced with the charge amount of the charged particles that exit the dust collection portion. Therefore, the charged particles that have escaped from the dust collecting portion can be always neutralized with a good balance regardless of the contamination of the dust collecting portion.
  • the static eliminator is provided with a plurality of electrodes provided on a surface orthogonal to the air flow direction, and a surface orthogonal to the air flow direction across the electrodes. And a plate-like counter electrode provided at a predetermined interval in the opposite position on the upper side.
  • the static eliminator includes a plurality of electrodes provided on a surface orthogonal to the air flow direction, and an air flow direction perpendicular to the electrodes at a predetermined interval. And a counter electrode having a plurality of ventilation holes on the surface to be provided.
  • the charged particles that have escaped from the dust collecting part can always be discharged in a well-balanced manner regardless of the dirt on the dust collecting part. Can be removed efficiently without charging.
  • An electric dust collection system includes a charging unit that charges dust in air sucked from a main duct, and a dust collection unit that removes dust charged by the charging unit, An electrostatic precipitator that cools the object to be cooled with the dusted air; and a static eliminator that ionizes the air sucked from the sub duct and discharges it to the upstream side of the object to be cooled in the main duct. .
  • the entire cooling target is discharged as an independent panel static eliminator,
  • the charged dust that has exited the dust collecting portion is efficiently neutralized together with the object to be cooled.
  • the static eliminator provided in a separate system generates an amount of ions necessary for static elimination of the object to be cooled and the charged dust that has escaped the dust collection unit with a unique air volume, wind speed, and ion density. Therefore, the static eliminator can be configured with a small size and low power consumption.
  • a twelfth aspect includes a charging unit that charges dust in the air sucked from the main duct, and a dust collecting unit that removes dust charged by the charging unit, and the object to be cooled by the collected air. And a static eliminator that ionizes the air sucked from the sub duct and discharges it to the vicinity of the downstream side of the dust collecting portion in the main duct.
  • the entire cooling target is neutralized as an independent panel neutralizer by discharging air ions (static ion) generated in a separate system to the vicinity of the downstream side of the dust collecting portion in the main duct.
  • the charged dust that has escaped from the dust collecting portion is efficiently neutralized before reaching the object to be cooled. Therefore, it is possible to effectively prevent the inside of the main duct from being contaminated by charged dust.
  • the static eliminator provided in a separate system generates an amount of ions necessary for static elimination of the object to be cooled and the charged dust that has escaped the dust collection unit with a unique air volume, wind speed, and ion density. Therefore, the static eliminator can be configured with a small size and low power consumption.
  • the static eliminator ionizes the air sucked from the sub duct simultaneously in the positive polarity and the negative polarity by positive and negative DC high voltages.
  • the static eliminator of the thirteenth aspect since positive ions and negative ions are constantly generated in parallel, a relatively large number of ions can be generated, and ions from each discharge needle fly while repelling each other. Therefore, it can be efficiently transported to a relatively far object to be cooled.
  • the static eliminator ionizes air sucked from the sub duct to a polarity opposite to that of charged dust by a positive or negative DC high voltage.
  • the dust that has been sucked in is charged with positive polarity (or negative polarity), so that most of the dust that has come out of the dust collector is charged with positive polarity (or negative polarity). Accordingly, it is conceivable that the ion balance in the object to be cooled is biased to the positive polarity (or negative polarity) side.
  • the air sucked from the sub-duct is ionized to the opposite polarity to the charged dust by a single polarity DC high voltage. Charged dust can be removed efficiently.
  • the static eliminator alternately ionizes air sucked from the sub duct into a positive polarity and a negative polarity by an alternating high voltage or a direct alternating high voltage.
  • the air sucked from the sub duct is ionized alternately in the positive polarity and the negative polarity, so that there is little temporal and spatial deviation of the ion balance in the cooling target.
  • an AC high voltage of several tens of KHz from the commercial frequency can be used, and if a high frequency is used, the power supply unit (transformer or the like) can be made compact. Further, if a DC alternating high voltage (pulse voltage) is used, more air ions can be generated than a sinusoidal alternating current.
  • the static eliminator is provided in a direction opposite to each other with a plate-like counter electrode provided parallel to the air flow direction and the counter electrode interposed therebetween.
  • a plurality of discharge needles A necessary amount of air ions can be generated efficiently and stably by providing a configuration in which a plurality of discharge needles oppose each other with the counter electrode interposed therebetween.
  • the static eliminator is provided on a surface orthogonal to the air flow direction and a plurality of discharge lines provided in parallel to the surface orthogonal to the air flow direction.
  • a counter electrode provided at a position spaced apart from the discharge line by a predetermined distance.
  • a larger number of air ions can be generated efficiently by providing a plurality of discharge lines in parallel on a surface orthogonal to the air flow direction.
  • a counter electrode having a plurality of ventilation holes at a position spaced apart from the discharge line by a predetermined distance, it is possible to reduce the contamination of the discharge line and the counter electrode and to stably supply more air ions for a long time. Can provide electrical appliances.
  • An eighteenth aspect is the common fan according to the eleventh or twelfth aspect, wherein the air after dust collection by the dust collector and the air after ionization by the static eliminator are provided on the electric dust collector side. Is configured to be conveyed to the cooling object.
  • the eighteenth aspect by using the negative pressure generated in the main duct by the common fan provided on the electrostatic precipitator side, it is not necessary to provide a fan on the static eliminator side. Can be configured compactly and at low cost.
  • the static eliminator provided in a separate system from the electrostatic precipitator can be configured in a small size, low cost and variously according to the original specifications, the electrostatic collector having high dust collection and static elimination performance is provided. It greatly contributes to the spread and expansion of the application range of dust systems.
  • FIG. 1A is a side cross-sectional view of the electrostatic precipitator 400A according to the first embodiment, and the static elimination unit 404A generates static elimination ions at the same position as the discharge line 418 of the charging unit 414. This shows the case where the electric discharge wire 426 is arranged. However, it is not limited to this.
  • the electrostatic precipitator 400A includes a mechanical filter 410 for removing coarse dust, an electrostatic precipitator 402 for collecting particles by charging particles in the air, and neutralizing charged particles that have escaped from the precipitator 402 (medium
  • the neutralization unit 404A is provided, and these are arranged side by side inside a duct (cylinder) 415 having a rectangular cross section.
  • FIG. 1B is a cross-sectional view taken along the line AA ′ in FIG. 1A, and is a cross-sectional view taken along the line AA ′ of the charge removal portion 404A.
  • Masking plates 417 made of an insulating resin material are installed on both sides of the static elimination section so as to pass through. In FIG. 1 (b), the masking plate 417 is visible beyond the electric discharge wire 426. In this case, it is desirable that the boundary between the masking plate 417 and the static elimination portion space is set to be about b / 2 from the end of the static elimination wire 426 on the assumption of some airflow.
  • a fan is provided on the downstream side of the static elimination unit 404A.
  • the fan passes through the electrostatic dust collection unit 402 and the static elimination unit 404A and is cooled on the downstream side (for example, a video projector).
  • Generates an air flow that reaches The arrows in the figure indicate that air flows in the duct 215 from the left side to the right side.
  • the mechanical filter 410 removes relatively large particles (dust) from the air sucked into the duct 415.
  • the opening of the mechanical filter 410 is selected so that, for example, coarse dust having a particle diameter of ⁇ ⁇ 500 ⁇ m can be removed. If the opening is too small, clogging is likely to occur.
  • the electrostatic dust collection unit 402 includes a charging unit 414 that charges particles in the air that have passed through the mechanical filter 410, and a dust collection unit 416 that captures these charged particles by Coulomb force acting on an electrostatic field.
  • the charging unit 414 has a plurality of discharge lines (ionization lines) 418 arranged at equal intervals on a plane orthogonal to the air flow direction, and a plate-like shape arranged at a predetermined interval above and below the discharge lines 418.
  • a counter electrode (corresponding to the first counter electrode of the present invention) 420 is provided, and each discharge line 418 and the counter electrode 420 are insulated and supported apart from each other.
  • the discharge wire 418 is made of a fine metal wire, for example, a tungsten wire, a member such as a plated wire or a clad wire in which platinum, rhodium, palladium, or an alloy thereof is coated on the surface of a wire material rich in tensile strength, or equivalent characteristics. A member having a function can be used.
  • the counter electrode 420 is made of conductive resin or metal.
  • the dust collection part 416 is a plate-like non-dust collection electrode 422 provided in parallel with the discharge line 418 in the air flow direction, and a plate-like shape arranged at a predetermined interval above and below the non-dust collection electrode 422.
  • the non-dust collection electrode 422 and the dust collection electrode 424 are insulated and supported apart from each other.
  • the non-dust collecting electrode 422 is made of a conductive or semi-insulating resin or metal
  • the dust collecting electrode 424 is made of a conductive resin or metal.
  • the static eliminator 404A includes a plurality of electric discharge wires 426 arranged at equal intervals on a surface orthogonal to the air flow direction, and a plate-like counter electrode 428 arranged at a predetermined interval above and below the electric discharge wires 426. It has.
  • the counter electrode 428 corresponds to the second counter electrode in the present invention.
  • the removal wire 426 is made of a thin metal wire similar to the discharge wire 418 such as a tungsten wire, and the counter electrode 428 is made of conductive resin or metal.
  • a positive DC high voltage + V3 (for example, +6.6 KV) is applied to the discharge line 418, and the counter electrode 420 is grounded, for example.
  • + V3 for example, +6.6 KV
  • the counter electrode 420 is grounded, for example.
  • a corona discharge is generated around the discharge line 418, the surrounding air is ionized to generate + ions, and the generated + ions move to the counter electrode 420 side according to the lines of electric force.
  • the electrons are received from 420 and neutralized.
  • the state of the electric lines of force on the surface perpendicular to the discharge line 418 is indicated by a dotted line in the figure.
  • the lines of electric force emitted from the periphery of the discharge line 418 radiate toward the upper and lower counter electrodes 420 and are absorbed in parallel on the surface of the counter electrode 420 made of metal.
  • a tangent line on an arbitrary point of the electric force line indicates the direction of the electric field at that point, and the number of electric force lines passing through the unit area is proportional to the strength of the electric field.
  • Particles (dust) that flow into the space of the charged portion 414 along with the air flow are polarized by the electric field in the charged portion space, and are positively charged by attaching + ions to the ⁇ polarization side.
  • a uniform electric field is generated between the non-dust collection electrode 422 and the grounded dust collection electrode 424 by applying a DC high voltage + V2 (for example, +2.5 KV).
  • a state of electric lines of force on a surface perpendicular to the non-dust collecting electrode 422 is indicated by a dotted line in the figure.
  • the lines of electric force generated from the surface of the non-dust collection electrode 422 travel in parallel toward the surfaces of the upper and lower dust collection electrodes 424 and are absorbed by the surface of the dust collection electrode 424.
  • the electric field of the dust collection part 416 is uniform (uniform), and charged particles passing through this space in the air flow direction receive a Coulomb force proportional to their own + charge amount. It is attracted and captured (dust collection).
  • a discharge wire 426 is provided at the same position as the discharge line 418 of the charging unit 414, and an AC high voltage (for example, several KV) from the AC power source 450 is applied to the discharge wire 426,
  • the counter electrode 428 is grounded, for example.
  • positive and negative corona discharges are alternately generated around the discharge wire 426, and the surrounding air is ionized to generate + ions and ⁇ ions in time series. It moves to the counter electrode 428 side according to the line. That is, an ion shower occurs.
  • the state of the electric lines of force on the surface perpendicular to the removal wire 426 is indicated by a dotted line in FIG.
  • the lines of electric force emitted from the periphery of the removal wire 426 radiate toward the upper and lower counter electrodes 428 and are absorbed in parallel on the surface of the counter electrode 428.
  • the spatial density of ions is the highest in the vicinity of the removal line 426 where the lines of electric force are concentrated, whether in the case of + ions or in the case of ⁇ ions, and the distance from the periphery of the removal line 426 increases the extent of the lines of electric force.
  • the spatial density of ions also decreases.
  • a tungsten wire having a diameter of 0.9 to 2.0 [mm] is used for the wire removal 426.
  • the counter electrode 428 is a parallel plate having a uniform shape in the discharge region of the electric discharge line, and ensures discharge uniformity in the longitudinal direction. Further, at both ends of the removal wire 426, there is a corona-free region due to the removal of the removal wire 426. Arrange without contact. Assuming that there is some airflow around the boundary between the static elimination section space and the masking plate 417, it is desirable to provide this boundary on the inner side by about b / 2 from the end of the static elimination wire. However, b is the distance between the removal wire 426 and the counter electrode 428 (second counter electrode).
  • the AC power source 450 one having a commercial frequency (50/60 Hz) may be used. However, when the frequency of + ions and ⁇ ions generated in time series is too low, the amplitude of the ion balance increases. .
  • the amplitude of the ion balance refers to an amplitude at which the surface potential of the object irradiated with positive and negative ions periodically varies between the positive side and the negative side.
  • the AC power supply 450 can generate more ions than a sine wave AC by using not only a sine wave AC but also an alternating high voltage of a rectangular wave or a pulse.
  • FIG. 2A is a schematic configuration diagram of the electrostatic precipitator 400B according to the second embodiment, and the charge removal unit 404B has, for example, the tip of the charge removal needle 430 at the same position as the discharge line 418 of the charge unit 414. The case where it arrange
  • the configuration of the charging unit 414 and the dust collection unit 416 may be the same as that described in FIG.
  • the neutralization unit 404B shown in FIG. 2A is disposed with a plurality of static elimination needles 430 arranged at equal intervals on a surface orthogonal to the air flow direction, and at a predetermined interval above and below the static elimination needles 430.
  • Each static elimination needle 430 is made of a cylindrical conductive member, and is insulated and supported so that the needle at the tip portion formed in a conical shape is directed upstream (or downstream) in the air flow direction.
  • FIG. 2B is a diagram showing a cross section taken along the line AA ′ in FIG.
  • the state of the electric lines of force on the surface parallel to the static elimination needle 430 is indicated by a dotted line in the figure.
  • the lines of electric force emitted from the static elimination needle 430 radiate radially toward the upper and lower counter electrodes 428 and are absorbed in parallel on the surface of the counter electrode 428 made of metal.
  • the opposite is true for negative half cycles.
  • the interval p between the needles is preferably set in the range of p ⁇ 2b.
  • b is the distance between the static elimination needle 430 and the counter electrode 428.
  • tip part is made to face airflow, or it installs in the reverse direction.
  • the static elimination electrode is made of the static elimination needle 430 that is strong and difficult to cut, so that a required amount of static elimination ions can be stably generated for a long time.
  • the static elimination needle 430 does not exist in the vicinity of the left and right end portions of the static elimination unit 404B, there is a relatively large corona dead space, and there is a high probability that charged particles passing through this part will not be eliminated.
  • the masking plate 417 is disposed in a non-contact manner upstream of the static elimination needle 430 so that the airflow does not pass through this space.
  • the boundary between the masking plate 417 and the static eliminating portion space is assumed to be slightly inward from the end of the static eliminating portion space by assuming some airflow. Therefore, all of the charged particles that pass through the charge removal unit 404B can be discharged efficiently.
  • the static elimination electrode (the static elimination wire 426 / static elimination needle 430) as described above, for example, even if a dedicated counter electrode 428 that is grounded is not provided, the static elimination electrode is much higher than the surroundings.
  • corona discharge can be caused by applying a low voltage, but in this embodiment, a stable discharge characteristic is ensured by providing a plate-like counter electrode 428 dedicated to the static elimination electrode. Note that the counter electrode 428 in this example is common to the counter electrode 420 of the charging unit 414.
  • FIG. 3 (a) is a schematic configuration diagram of an electrostatic precipitator 400C according to the third embodiment, and this static elimination unit 404C has a plurality of eliminations provided at equal intervals on a plane orthogonal to the air flow direction.
  • the counter electrode 432a is also referred to as a honeycomb electrode.
  • FIG. 3B is a diagram showing an AA ′ cross section in FIG. 3A, and shows an AA ′ cross sectional view of the charge removal portion 404C.
  • the electric dust collector 402 may be the same as that described with reference to FIG.
  • the material of the removal wire 426 may be the same as the discharge wire 418 of the charged part.
  • the honeycomb electrode 432a is made of conductive resin or metal and is grounded, for example. By applying an alternating high voltage to the removal wire 426, a corona discharge is generated around the removal wire 426, and the surrounding air is ionized to generate + ions and ⁇ ions alternately.
  • the state of the electric lines of force on the surface perpendicular to the removal wire 426 is indicated by a dotted line in FIG.
  • the lines of electric force emitted from the periphery of the removal wire 426 radiate toward the upstream and downstream honeycomb electrodes 432a and are absorbed in parallel on the surface of the honeycomb electrode 432a made of metal.
  • the electric field is strongest in the vicinity of the removal wire 426 where the electric lines of force are concentrated, the electric field is weak at a position away from the removal wire 426, and the electric field is uniform on the surface of the counter electrode 432a where the electric force lines are absorbed in parallel. It is like (uniform).
  • the + ions and the ⁇ ions generated alternately around the discharge wire 426 are attracted to the counter electrode 432a side and absorbed by the counter electrode 432a according to the electric field in the charge removal portion space.
  • the intensity of the corona discharge is related to the opening D of the honeycomb electrode 432a.
  • the opening D is selected within a range in which more ions can be generated by the electric discharger 426 and more air and charged particles can pass downstream.
  • the honeycomb electrode 432a is provided upstream and downstream with the electric discharge 426 interposed therebetween, and preferably, the opening D of the upstream honeycomb electrode 432a is relatively small with respect to the downstream side, The adverse effect of the electric field on the dust collecting portion 416 is prevented, and on the other hand, by making the aperture D of the downstream honeycomb electrode 432a relatively large, it is easy to release ions downstream, and the downstream charging portion Promote static elimination. This is the same in the fourth to sixth embodiments described later.
  • the strength of the corona discharge is also related to the distance b ′ (see FIG. 3A) between the discharge wire 426 and the honeycomb electrode 432a. If this distance b 'is too small, strong corona discharge is generated and the amount of harmful ozone generated is increased. Therefore, this distance b 'is selected within a range in which a required amount of ions (discharge current) can be generated with a small amount of generated ozone (small discharge current).
  • the honeycomb electrode 432a is grounded to cause the removal wire 426 to generate stable corona discharge.
  • the influence of the dust collection unit 416 can be blocked from reaching the charge removal unit 404C.
  • the dust collector 416 and the charge removal unit 404C can be brought close to each other, and this type of electrostatic dust collector 400C can be configured in a small size.
  • the electric lines of force (electric field) interposed between the removal wire 426 and the upstream and downstream counter electrodes 432a are uniform in the left-right direction of FIG.
  • the density of the static elimination ions to be performed is substantially uniform in the left-right direction of the static elimination wire 426.
  • the electric field becomes non-uniform due to the spreading of the electric lines of force, so the ion density in this portion is not uniform.
  • the masking plate 417 is used to prevent the airflow from passing through this space.
  • the removal wire 426 is arranged in a non-contact manner on the upstream side of the removal wire 426.
  • the boundary between the masking plate 417 and the static elimination section space is set to be approximately b / 2 from the end of the static elimination wire 426, assuming a slight air flow.
  • b is the distance of the perpendicular dropped from the removal wire 426 to the virtual extension part of the first counter electrode 420 as in the example shown in FIG.
  • the distance between the removal wires 426 is preferably about 2b '.
  • b ' is the distance between the removal wire 426 and the counter electrode 432a.
  • the counter electrode 432a has a honeycomb structure, but is not limited thereto.
  • the shape of the vent hole 440 may be a square, a triangle, a rhombus, a circle, or the like. In this case, the same operation and effect as those of the honeycomb electrode can be obtained.
  • FIG. 4A is a schematic configuration diagram of an electrostatic precipitator 400D according to the fourth embodiment, and this static elimination section 404D is a mesh electrode 432b having a mesh structure instead of the honeycomb electrode 432a of FIG. 3A. And a static elimination needle 434 in place of the static elimination wire 426 of FIG.
  • the static elimination needle 434 is insulated and supported with the needles at both ends formed in a conical shape facing the upstream and downstream mesh electrodes 432b.
  • FIG. 4B is a view showing the AA ′ section in FIG. 4A, and is an AA ′ section view of the charge removal portion 404D.
  • the interval p between the needles is preferably set in the range of p ⁇ 2b.
  • b is the distance of the perpendicular drawn from the static elimination needle 434 to the virtual extension part of the 1st counter electrode 420 similarly to the said FIG.
  • the tip is directed upstream and downstream, or is installed in either direction.
  • the static elimination electrode is made of a static elimination needle 434 that is strong and difficult to cut, so that a required amount of static elimination ions can be stably generated for a long time.
  • the static elimination needle 434 does not exist in the vicinity of both left and right ends of the static elimination unit 404D, there is a relatively large corona dead space, and there is a high probability that charged particles passing through this part will not be eliminated.
  • the masking plate 417 is disposed upstream of the static elimination needle 434 so as not to contact the static elimination needle 434 so that the airflow does not pass through this space portion.
  • the boundary between the masking plate 417 and the static elimination portion space is assumed to be about b / 2 from the end of the static elimination space, assuming some airflow.
  • FIG. 5A is a schematic configuration diagram of the electrostatic precipitator 400E according to the fifth embodiment
  • FIG. 5B is a cross-sectional view taken along line A-A ′ in FIG.
  • This static elimination part 404E has shown the case where it replaces with the honeycomb electrode 432a of the said Fig.3 (a), and the mesh electrode 432b of a mesh structure is provided.
  • the grounded mesh electrode 432b is disposed between the dust collecting portion 416 and the removal wire 426, the same effect as that obtained when the honeycomb electrode 432a (see FIG. 3) is used is obtained.
  • the mesh electrode 432b can be produced at low cost.
  • a counter electrode having a so-called punching metal structure in which a circular or arbitrary polygonal shape is punched at a high density on a conductive flat plate may be used.
  • FIG. 6A is a schematic configuration diagram of an electrostatic precipitator 400F according to the sixth embodiment
  • FIG. 6B is a cross-sectional view taken along line A-A ′ in FIG.
  • the static elimination unit 404F is configured to decenter the installation position of the static elimination wire 426 in the static elimination unit 404E of FIG. 5A from the center of the section sandwiched between the upstream and downstream counter electrodes 432b toward the downstream counter electrode 432b. Shows the case. Since the distance between the static elimination wire 426 and the downstream counter electrode 432b has become closer, it is possible to increase the number of positive and negative ions that escape to the downstream side of the static elimination unit 404F. Alternatively, the high voltage applied to the wire removal 426 to generate a required amount of ions can be lowered.
  • a plurality of static elimination wires 426 are alternately grouped, and positive and negative respectively. You may comprise so that a negative direct-current high voltage may be applied. In this direct current method, more neutralization ions can be generated than in the alternating current method, and + and ⁇ neutralization ions are mixed while passing through the duct 415 so that the charged particles that have escaped from the dust collecting portion 416 can be efficiently and reliably obtained. Static neutralization is possible.
  • the case where the counter electrodes 428 (FIGS. 1 and 2), 432a, and 432b are provided in the static elimination section 404 (404A to 404F) has been described. Absent. Even if the counter electrode 428, 432a, 432b is not provided in the charge removal unit 404, a substantial ground potential that surrounds the space of the charge removal unit 404 (for example, the ground potential generated by the dust collection electrode 424 of the dust collection unit 416). ), It is possible to cause corona discharge in the static elimination wire 426 and static elimination needles 430 and 434.
  • each electric discharge electrode A positive corona and a negative corona may be generated alternately.
  • the present invention is not limited to this.
  • copying machines, printers, and various types of projection types are used.
  • the present invention may be applied to a video display device (projector) and an air cleaner (for example, a smoke separator or an air conditioner).
  • FIG. 7 is a schematic configuration diagram of an electrostatic precipitator 500A according to the seventh embodiment.
  • FIG. 7 (a) is a cross-sectional view as viewed from the side, and FIG. 7 (b) is the same as FIG. It is AA 'sectional drawing shown.
  • the electric dust collector 500A includes a mechanical filter 510, an electric dust collector 502, and a static eliminator 504A, which are arranged inside a duct (cylinder) 515 having a rectangular cross section.
  • a fan is provided on the downstream side of the static elimination unit 504A.
  • the fan passes through the electric dust collection unit 502 and the static elimination unit 504A and reaches the cooling target (for example, a video projector) on the downstream side.
  • the cooling target for example, a video projector
  • Such an air flow is generated.
  • the arrows in the figure indicate that air flows in the duct 515 from the left side to the right side.
  • the mechanical filter 510 removes relatively large particles (coarse dust) having a particle size of ⁇ ⁇ 500 ⁇ m, for example, from the air sucked into the duct 515.
  • the electric dust collection unit 502 includes a charging unit 514 that charges particles (dust) in the air that has passed through the mechanical filter 510, and a dust collection unit 516 that captures these charged particles by a Coulomb force acting on an electrostatic field.
  • the charging unit 514 includes a plurality of discharge lines (ionization lines) 518 arranged at equal intervals on a surface orthogonal to the air flow direction, and a plate-like shape arranged at a predetermined interval above and below the discharge lines 518.
  • a counter electrode 520 is provided, and each discharge line 518 and the counter electrode 520 are insulated and supported apart from each other.
  • As the discharge line 518 for example, a metal wire such as a tungsten wire, a plated wire or a clad wire in which platinum or the like is coated on the surface of a wire rod rich in tensile strength can be used.
  • the counter electrode 520 is made of conductive resin or metal.
  • the dust collecting unit 516 is a plate-like non-dust collecting electrode 522 provided in parallel with the discharge line 518 in the air flow direction, and a plate-like shape arranged at a predetermined interval above and below the non-dust collecting electrode 522.
  • the non-dust collection electrode 522 and the dust collection electrode 524 are insulated and supported apart from each other.
  • the non-dust collecting electrode 522 is made of a conductive or semi-insulating resin or metal
  • the dust collecting electrode 524 is made of a conductive resin or metal.
  • the non-dust collection electrode 522 and the dust collection electrode 524 are insulated and supported apart from each other by an insulating support member 541 made of resin or the like.
  • dust adheres to the surfaces of the electrodes 522, 524 and the support member 541, and among these, the dust accumulation layer 542 that adheres particularly to the surface (wall surface) of the support member 541, This greatly affects the insulation resistance between the electrodes 522 and 524.
  • the insulation resistance also varies depending on the thickness of the deposited layer 542 and humidity.
  • the static elimination unit 504A includes a plurality of static elimination needles 530 arranged at equal intervals on a surface orthogonal to the air flow direction, and a predetermined interval apart vertically between the static elimination needles 530. And a plate-like counter electrode 528 (common to the counter electrode 520 in the illustrated example).
  • the static elimination needle 530 is made of, for example, a cylindrical conductive member, and is insulated and supported so that the needles at both ends formed in a conical shape are directed to the surfaces of the upper and lower opposing electrodes 528.
  • a positive DC high voltage V3 (for example, +7 KV) is applied to the discharge line 518, and the counter electrode 520 is grounded, for example.
  • V3 positive DC high voltage
  • the counter electrode 520 is grounded, for example.
  • a corona discharge is generated around the discharge line 518, the surrounding air is ionized to generate + ions, and the generated + ions move to the counter electrode 520 side according to the lines of electric force.
  • the electrons are received from 520 and neutralized.
  • a state of electric lines of force on a plane perpendicular to the discharge line 518 is indicated by a dotted line in the figure.
  • Particles (dust) that flow into the space of the charged portion 514 due to the flow of air are polarized by the electric field in the charged portion space, and are positively charged by + ions adhering to the negative side of the charged portion. Flushed to the side.
  • the dust collector 516 applies a positive DC high voltage V ⁇ b> 2 (for example, +3 KV) to the non-dust collector electrode 522, thereby forming a uniform electric field between the grounded dust collector electrode 524 (common to the counter electrode 520). Is generated.
  • V ⁇ b> 2 for example, +3 KV
  • a state of electric lines of force on a surface perpendicular to the non-dust collecting electrode 522 is shown by a dotted line in FIG.
  • the lines of electric force generated from the surface of the non-dust collecting electrode 522 travel in parallel toward the surfaces of the upper and lower dust collecting electrodes 524 and are absorbed by the surface of the dust collecting electrode 524.
  • the electric field in the dust collection space is uniform (uniform), and charged particles passing through this space in the direction of air flow receive a Coulomb force proportional to the electric field in the dust collection space and the charge amount of the self charge. As a result, it is attracted to the dust collection electrode 524 side and captured (dust collection).
  • a negative DC high voltage V1 (for example, ⁇ 4 KV) is applied to the static elimination needle 530, and the counter electrode 528 is grounded, for example.
  • V1 for example, ⁇ 4 KV
  • a negative corona discharge is generated in the vicinity of both tips of the static elimination needle 530, and the surrounding air is ionized to generate negative ions, and these ions move to the counter electrode 528 side according to the lines of electric force.
  • Neutralized A state of electric lines of force on a plane parallel to the static elimination needle 530 is indicated by a dotted line in FIG.
  • the + charged charged particles that have escaped from the dust collecting portion 516 are neutralized (neutralized) in a well-balanced manner by the ⁇ ions in the static elimination portion space, and are transported downstream. Thereby, it can cool, without charging a cooling target object with the air which blows.
  • the non-dust collection electrode 522 and the dust collection electrode 524 which oppose each other are normally supported in a sufficiently insulated state, and there is a high insulation resistance between the two electrodes.
  • the insulation resistance decreases.
  • the electrode voltage V2 will decrease.
  • dust collection capability will fall and the quantity of the charged particle which escapes dust collection part 516 will increase.
  • the degree of contamination of the dust collection unit 516 is estimated by detecting the voltage between the electrodes 522 and 524, and the DC voltage V1 applied to the static elimination needle 530 based on the degree of contamination. Is changing. This will be specifically described below.
  • FIG. 8 is a block diagram showing the configuration of the power supply unit 30A of the electrostatic precipitator according to the seventh embodiment.
  • the power supply unit 30A generates a high-frequency sine wave signal, a CPU 31 that performs main control of the power supply unit 30A, a main memory 32 used by the CPU 31, an input / output interface (PIO) 33 for connection to peripheral circuits, and the like.
  • DDS direct digital synthesizer
  • the DDS 34 generates high-frequency (for example, 50 KHz) first and second AC signals AC1 and AC2 that are sine waves under the control of the CPU 31.
  • the amplitude of the first AC signal AC1 may be constant (for example, 12V), but the amplitude of the second AC signal AC2 depends on the detection voltage Vc (corresponding to dirt) of the non-dust collecting electrode 522.
  • Vc detection voltage
  • the high-frequency transformer 35 boosts the first AC input AC1 on the primary side and outputs a high-frequency AC high voltage (for example, 50 KHz, 1 KV) to the secondary side.
  • the m-fold voltage rectifier circuit 36 performs m-fold voltage rectification of the input high-frequency AC high voltage to generate a positive DC high voltage V3 (for example, +7 KV).
  • the high-frequency transformer 37 boosts the second AC input AC2 on the primary side and outputs a high-frequency AC high voltage (for example, 50 KHz, 1 KV to 1.4 KV) on the secondary side.
  • the n-fold voltage rectifier circuit 38 n-fold voltage rectifies the input high-frequency AC high voltage AC2 to generate a negative DC high voltage V1 (for example, ⁇ 4 KV to ⁇ 5.5 KV).
  • the DC high voltage V3 output from the m-fold voltage rectifier circuit 36 is applied to the discharge line 518 of the charging unit 514. Furthermore, the DC high voltage V3 is divided by the resistance voltage dividing circuits R1 and R2 having a large resistance value (R3 is extremely smaller than R1 and R2) to generate a DC high voltage V2 (for example, +3 KV). Applied to the non-dust collecting electrode 522.
  • the resistor R3 is a resistor having a small value for monitoring the voltage Vc proportional to the DC high voltage V2, and is provided in series with the resistor R2.
  • the detection voltage Vc of the resistor R3 is periodically A / D converted via the PIO 33 and taken into the CPU 31.
  • the CPU 31 variably controls the amplitude of the second AC signal AC2 of the DDS 34 according to the detection voltage Vc (corresponding to V2), and changes the voltage V1 applied to the charge removal unit 504A.
  • this voltage control will be specifically described.
  • FIGS. 9 and 10 are diagrams for explaining voltage control of the static eliminator 504A according to the seventh embodiment, and a direct current applied to the static eliminator 530 based on the voltage V2 (corresponding to Vc) detected from the non-dust collecting electrode 522. The case where voltage V1 is controlled appropriately is shown.
  • Fig. 9 shows the output characteristics of the dust collection power supply. Since this dust collecting power source is composed of resistance voltage dividing circuits R1 and R2, the output voltage [KV] on the vertical axis is the divided voltage V2, and the output current [ ⁇ A] on the horizontal axis is the insulation between the resistor R2 and the dust collecting portion. This corresponds to the total load current flowing through the resistor Rc. Since the output impedance of the dust collection power source (resistance voltage dividing circuit) is large, the output characteristic is a drooping characteristic that varies uniformly as indicated by reference numeral “A” in FIG.
  • the load resistance R2 ' is a parallel combined resistance of the resistance R2 and the insulation resistance Rc. When the insulation resistance Rc decreases, the load resistance R2' also decreases.
  • FIG. 10 is a graph showing the relationship of the voltage V1 to be applied to the static elimination needle 530 corresponding to the voltage V2 detected for the non-dust collecting electrode 522.
  • power is supplied from the resistance voltage dividing circuits R1 and R2 to the static elimination unit 504A. Therefore, if dust adheres to the dust collection unit 516, the power supply voltage V2 is relatively high depending on the degree of contamination. Remarkably reduced. When the dust collection voltage V2 decreases, the dust collection capability decreases, and the amount of + charged particles that exit the dust collection unit 516 also increases.
  • the voltage V2 detected for the dust collection unit 516 and the charged particles that exit the dust collection unit 516 at each time are neutralized (neutralized).
  • the relationship with the static elimination voltage V1 capable of generating a sufficient amount of ions is obtained by a number of experiments in advance, and the obtained data is averaged by statistical processing and stored in a table in the main memory 32. Keep it.
  • the CPU 31 obtains the voltage V1 to be applied to the static elimination needle 530 with reference to the relationship table shown in FIG. 10 based on the detection voltage Vc (corresponding to V2) of the dust collecting unit 516, and the n-fold voltage rectifier circuit 38 uses the voltage V1. Is controlled to control the amplitude of the second AC signal AC2 of the DDS 34. As a result, the charged particles that have escaped from the dust collecting portion can be always neutralized with good balance regardless of the dirt of the dust collecting portion 516.
  • FIG. 11 is a schematic configuration diagram of an electrostatic precipitator 500B according to the eighth embodiment, where FIG. 11A is a side sectional view, and FIG. 11B is A shown in FIG. 11A. -A 'sectional view.
  • a neutralization unit 504B shown in FIG. 11A is orthogonal to the flow direction of the air that is spaced apart from the plurality of electrical discharge lines 526 provided at equal intervals on a plane orthogonal to the flow direction of air.
  • a counter electrode 532 having a honeycomb structure having a plurality of ventilation holes 540 on the surface.
  • the counter electrode 532 is also referred to as a honeycomb electrode.
  • the material of the removal wire 526 may be the same as the discharge wire 518 of the charged part.
  • the honeycomb electrode 532 is made of conductive resin or metal and is grounded, for example. By applying a negative DC high voltage V1 to the wire removal line 526, a corona discharge is generated around the wire removal line 526, and the surrounding air is ionized to generate negative ions.
  • the state of the electric lines of force on the surface perpendicular to the removal wire 526 is indicated by a dotted line in FIG.
  • the lines of electric force generated from the periphery of the removal wire 526 radiate toward the upstream honeycomb electrode 532 and are absorbed in parallel on the surface of the honeycomb electrode 532 having conductivity.
  • The-ions generated around the static elimination wire 526 are attracted to the counter electrode 532 side according to the electric field in the static elimination portion space and absorbed by the counter electrode 532.
  • the intensity of the corona discharge is related to the opening D of the honeycomb electrode 532.
  • the strength of the corona discharge is also related to the distance b between the discharge wire 526 and the honeycomb electrode 532. If this distance b is too small, strong corona discharge occurs and the amount of harmful ozone generated increases. Therefore, the distance b is selected within a range in which a required amount of ⁇ ions can be generated with a small amount of ozone generated (small discharge current).
  • the honeycomb electrode 532 is grounded to cause the removal wire 526 to generate a stable corona discharge.
  • the influence of the dust collection unit 516 can be blocked from reaching the charge removal unit 504B.
  • the dust collection unit 516 and the charge removal unit 504B can be brought close to each other, and this type of electric dust collection device 500B can be configured in a small size.
  • honeycomb electrode 532 is provided on the upstream side of the discharge wire 526, the present invention is not limited thereto.
  • the honeycomb electrode 532 may be provided on the downstream side of the removal wire 526, or may be provided on both the upstream side and the downstream side of the removal wire 526.
  • a mesh electrode or an electrode having a so-called punching metal structure in which vent holes having an arbitrary shape are arranged on a conductive flat plate may be used.
  • the configuration other than the charge removal unit 504B illustrated in FIG. 11A may be the same as that described with reference to FIG.
  • FIG. 12 is a block diagram showing the configuration of the power supply unit 30B of the electrostatic precipitator according to the eighth embodiment.
  • the power supply unit 30B is different from the power supply unit 30A shown in FIG. 8 only in the configuration of the m-fold voltage rectifier circuit 36.
  • This m-fold voltage rectifier circuit 36 applies a positive DC high voltage V3 (for example, +7 KV) applied to the discharge line 518 by applying an m-fold voltage rectification to the input high-frequency AC high voltage and the non-dust collecting electrode 522 of the dust collecting unit 516.
  • a positive DC high voltage V2 (for example, +3 KV) is generated.
  • the DC high voltage V2 has a stabilized output voltage, and is applied to the non-dust collecting electrode 522 via a resistor Rs having a small value for monitoring the current flowing through the non-dust collecting electrode 522. Yes.
  • the detection voltage of the current Ic flowing through the monitor resistor Rs is periodically A / D converted via the PIO 33 and taken into the CPU 31.
  • the CPU 31 variably controls the amplitude of the second AC signal AC2 of the DDS 34 according to the detection current Ic, and changes the voltage V1 applied to the wire removal 526.
  • this control will be specifically described.
  • FIGS. 13 and 14 are diagrams for explaining voltage control of the static elimination unit 504B according to the eighth embodiment, and appropriately controls the voltage V1 applied to the static elimination wire 526 based on the current Ic flowing through the non-dust collection electrode 522. Shows when to do.
  • Fig. 13 shows the output characteristics of the dust collection power supply.
  • the vertical axis represents the output voltage V2 [KV], and the horizontal axis represents the output current Ic [ ⁇ A]. Since the output voltage V2 of this dust collection power supply is stabilized, the output characteristic “B” has an inverted L-shaped characteristic as illustrated.
  • the resistance Rc is an insulation resistance of the dust collection portion 516. When dust accumulates on the dust collection portion, the insulation resistance Rc decreases. The intersections of the output characteristics B and the insulation resistance Rc when the insulation resistance Rc changes by a certain amount are plotted with black dots shown in FIG.
  • FIG. 14 shows the relationship between the current Ic flowing through the non-dust collecting electrode 522 and the voltage V1 applied to the wire removal line 526.
  • the electrode voltage V2 since the output voltage V2 is supplied from the stabilized power source to the non-dust collecting electrode 522, the electrode voltage V2 does not change if dust adheres to the dust collecting portion 516, but the electrode The current Ic increases relatively significantly depending on the degree of contamination. In a state where the electrode current Ic increases, the dust collection capability decreases according to the dirt of the dust collection unit 516, and the amount of + charged particles that escape from the dust collection unit also increases.
  • the current Ic flowing through the dust collection unit 516 detected each time according to the dirt of the dust collection unit 516 and the charged particles exiting the dust collection unit 516 at each time point are neutralized (neutralized).
  • the relationship with the static elimination voltage V1 capable of generating a sufficient amount of ions is obtained by a number of experiments in advance, and the obtained data is averaged by statistical processing and stored in the table of the main memory 32. Keep it.
  • the CPU 31 refers to the relationship table shown in FIG. 14 based on the detection current Ic of the dust collector 216 to obtain the voltage V1 to be applied to the wire removal line 526 and allows the n-fold voltage rectifier circuit 38 to generate the voltage V1.
  • the amplitude of the second AC signal AC2 is controlled. As a result, the charged particles that have escaped from the dust collecting portion can be always neutralized with good balance regardless of the dirt of the dust collecting portion 516.
  • the charging unit 514 charges the particles positively, but the present invention is not limited to this.
  • the charging unit 514 may be configured to charge the particles negatively, and in this case, the charge removing unit 504 may be configured to exclusively generate + ions, contrary to the above.
  • the present invention is not limited to this. It is obvious that the electric dust collector of the present invention may be applied to, for example, a copying machine, a printer, various types of projection display devices (projectors), and an air cleaner (for example, a smoke separator or an air conditioner). It is.
  • FIG. 15 is a schematic configuration diagram of an electric dust collection system according to the ninth embodiment.
  • FIG. 15 (a) is a side sectional view
  • FIG. 15 (b) is a PP ′ shown in FIG. 15 (a).
  • a cross-sectional view is shown.
  • this electrostatic precipitator system is a combination of an electrostatic precipitator 200 provided in a main duct 215 and a DC type static eliminator 300A provided in a sub duct 315 of a different system.
  • the air ions generated in the sub duct 315 are discharged to the vicinity of the upstream side of the projector (corresponding to the object to be cooled in the present invention) 208 in the main duct 215.
  • the arrows in the figure indicate the flow of air in the electric dust collection system.
  • the air flows from the left side to the right side in FIG. 15, and the sub duct 315 of the static eliminator 300A is connected via a connecting portion 316 provided on the downstream side.
  • the main duct 215 is connected to the vicinity of the upstream side of the projector 208.
  • the connecting portion 316 may be integrally formed by extending the sub duct 315 made of resin or metal, but other than that, rubber, nylon, cloth, kraft paper or the like is used as a material so that air does not leak. It may be composed of a flexible cylindrical member or bellows member coated on the surface.
  • the electric dust collector 200 includes a charging unit 214 that charges dust in the air sucked from the main duct 215, and a dust collecting unit 216 that removes dust charged by the charging unit 214.
  • the projector 208 is cooled with air.
  • the static eliminator 300A ionizes the air sucked from the sub duct 315 into positive and negative air, respectively, and discharges them to the vicinity of the upstream side of the projector 208 in the main duct 215.
  • projector 208 is cooled by clean air collected by main duct 215, and air ions (static charge ions) generated by a system different from main duct 215 are released in the vicinity of the upstream side of projector 208.
  • the static eliminator 300A has a function as a so-called panel static eliminator that discharges air ions to the entire projector 208, which is a static elimination target, and the charged dust that has flowed out of the dust collector 216 is the projector 208. At the same time, the charge is removed efficiently.
  • the static eliminator 300A provided in a separate system from the main duct 215, the amount of ions necessary for neutralizing the charged dust that has escaped from the main body of the projector 208 and the dust collecting unit 216 is converted into a unique air volume, wind speed, and ion density. Therefore, the static eliminator 300A can be configured with a small size and low power consumption.
  • the configuration of each unit will be described in detail.
  • the electrostatic precipitator 200 includes a mechanical filter 210, an electrostatic precipitator 202, an electrostatic filter 212, and a fan 206, which are provided side by side inside a main duct (cylinder) 215 having a rectangular cross section. It has been.
  • a fan 206 provided on the downstream side of the electrostatic filter 212 generates an air flow that passes through the electrostatic dust collection unit 202 from the suction port of the main duct 215 and reaches the projector 208 downstream.
  • the fan 206 may be located on the upstream side of the electrostatic filter 212.
  • the mechanical filter 210 removes relatively large dust from the air sucked from the opening end of the main duct 215.
  • the opening of the mechanical filter 210 is selected so that, for example, coarse dust having a particle diameter of ⁇ ⁇ 500 ⁇ m can be removed. If the opening is too small, clogging is likely to occur.
  • the electric dust collecting unit 202 includes a charging unit 214 that charges dust in the air that has passed through the mechanical filter 210, and a dust collecting unit 216 that captures the charged dust using a Coulomb force acting on an electrostatic field.
  • the charging unit 214 includes a plurality of discharge lines (ionization lines) 218 arranged at equal intervals on a surface orthogonal to the air flow direction, and plate-like counter electrodes 220 arranged above and below the discharge lines 218, respectively.
  • the discharge lines 218 and the counter electrode 220 are insulated and supported apart from each other.
  • the discharge wire 218 is made of a thin metal wire, for example, a tungsten wire, a member such as a plated wire or a clad wire with platinum, rhodium, palladium, or an alloy thereof coated on the surface of a high-strength wire, or equivalent characteristics. A member having a function can be used.
  • the counter electrode 220 is made of conductive resin or metal and is grounded, for example. By applying a DC high voltage + V3 (for example, +7 KV) from the power source to each discharge line 218, a corona discharge is generated around the discharge line 218, and the surrounding air is ionized to be ionized positively. By adhering to the dust, the dust is charged positively.
  • a DC high voltage + V3 for example, +7 KV
  • the dust collection portion 216 is provided in parallel with the discharge line 218, and has a plate-like non-dust collection electrode 222 made of conductive or semi-insulating resin or metal, and the non-dust collection electrode 222 sandwiched up and down.
  • a plate-like dust collecting electrode 224 (which is common to the counter electrode 220 in the example of FIG. 15), which is disposed and made of conductive resin or metal, is provided, and the non-dust collecting electrode 222 and the dust collecting electrode are provided. 224 is insulated and supported apart from each other.
  • the electrostatic filter (electret filter) 212 at the next stage is provided for the purpose of capturing (removing) charged dust that could not be captured by the dust collection unit 216.
  • the electrostatic filter 212 is obtained by heating and melting an insulating polymer material (Teflon (registered trademark), polypropylene, mylar, etc.), solidifying between electrodes while applying a DC high voltage thereto, and then removing the electrodes. Generated. As a result, the surface in contact with the electrode is charged positively or negatively, and their polarization is maintained semipermanently (electretized).
  • the electrostatic filter 212 since the material fiber (filter fiber) is electretized, a suction force due to static electricity is applied to the charged dust, and the effect of collecting the dust is increased.
  • a mechanical filter having equivalent dust collection performance may be used instead of the electrostatic filter 212.
  • the air that has passed through the electrostatic filter 212 is blown by the fan 206, and the projector 208 is cooled by a sufficient air volume.
  • the static eliminator 300A includes a mechanical filter 311, an electrostatic filter 312, a DC static eliminator 304 ⁇ / b> A, and a fan 313, which are arranged inside a sub-duct (cylinder) 315 having a rectangular cross section. ing.
  • the mechanical filter 311 removes coarse dust from the air sucked from the opening end of the sub duct 315.
  • the next-stage electrostatic filter 312 is provided for the purpose of capturing fine dust that could not be removed by the mechanical filter 311.
  • a mechanical filter having equivalent performance may be used instead of the electrostatic filter 312.
  • the air that has passed through the electrostatic filter 312 is ionized by the static elimination unit 304 ⁇ / b> A and blown out by the fan 313 to the upstream side of the projector 208 in the main duct 215.
  • the structures of the mechanical filter 311 and the electrostatic filter 312 may be the same as those of the mechanical filter 210 and the electrostatic filter 212. However, since the static eliminator 300A does not have an electric dust collection function, the mechanical filter 311 and the electrostatic filter 312 cover the dust collection capability for that amount if necessary.
  • the static eliminator 300A can be provided in a separate system at an arbitrary location away from the main duct 215, the air suction port of the sub duct 315 is preferably arranged in a location with little dust. Further, since the air volume required for the static eliminator 300A can be reduced to about 1/5 to 1/10 of that of the main duct 215, the dust collection burden on the filters 311 and 312 can be reduced.
  • the static eliminator 304A includes a plate-like counter electrode 328 provided parallel to the air flow direction, and a plurality of discharge needles 326 (326p, 326n) provided in opposite directions across the counter electrode 328.
  • a discharge needle 326 326p, 326n
  • FIG. 15B an example of the discharge needle 326 (326p, 326n) has a base end portion formed in a columnar shape and a tip end portion formed in a conical shape.
  • a DC high voltage + V1 for example, +5 KV
  • ⁇ V1 for example, ⁇ 5 KV
  • the static eliminator 300 ⁇ / b> A neutralizes the entire projector 208 as a panel static eliminator, and the charged dust discharged from the dust collecting unit 216 is efficiently neutralized together with the projector 208.
  • FIG. 16 is a schematic configuration diagram of an electric dust collection system according to a tenth embodiment of the present invention
  • FIG. 16 (a) is a side sectional view
  • FIG. 16 (b) is a diagram of FIG. FIG.
  • This electric dust collection system is configured by combining an electric dust collector 200 provided in a main duct 215 and a unipolar DC type static eliminator 300B provided in a sub duct 315 of a different system.
  • the electrostatic precipitator 200, the portion of the static eliminator 300B excluding the static eliminator 304B, and the manner of coupling the main duct 215 and the sub duct 315 may be the same as those described with reference to FIG. The description is omitted.
  • the negative DC high voltage ⁇ V1 (for example, ⁇ 5 KV) is supplied to all the discharge needles 326, thereby exclusively generating negative ionized air constantly. It is like that.
  • ⁇ V1 for example, ⁇ 5 KV
  • the panel neutralization of the projector 208 is performed at the same time. The charge of the charged dust that has escaped from the dust portion 216 is removed efficiently.
  • FIG. 17 is a schematic configuration diagram of an electric dust collection system according to an eleventh embodiment of the present invention.
  • FIG. 17 (a) is a side sectional view
  • FIG. 17 (b) is a diagram of FIG. FIG.
  • This electric dust collection system is configured by combining an electrostatic precipitator 200 provided in a main duct 215 and an AC type static eliminator 300C provided in a sub duct 315 of a different system.
  • the electrostatic dust collector 200, the portion of the static eliminator 300C excluding the static eliminator 304C, and the mode of coupling of the main duct 215 and the sub duct 315 may be the same as those described with reference to FIG.
  • the static elimination unit 304C is provided with a plurality of discharge needles 326, and the counter electrode 328 is grounded, for example.
  • AC sinusoidal alternating current
  • the AC power source 340 a commercial frequency (50/60 Hz) to a high frequency (for example, 20 KHz to 70 KHz) can be used.
  • a commercial frequency 50/60 Hz
  • a high frequency for example, 20 KHz to 70 KHz
  • the positive and negative ions generated in time series are easily recombined in the connecting portion 316, but the recombination ratio can be reduced by lowering the frequency.
  • the amplitude of the ion balance in the projector 208 increases.
  • the amplitude of the ion balance refers to an amplitude at which the surface potential of the projector 208 irradiated with positive and negative ions periodically varies between the positive side and the negative side.
  • the AC frequency can be appropriately selected in consideration of recombination of positive and negative ions and the amplitude of ion balance in the projector 208.
  • the AC power source 340 can generate more air ions than a sine wave AC by using not only a sine wave AC but also a DC alternating high voltage (pulse voltage).
  • FIG. 18 is a schematic configuration diagram of an electric dust collection system according to a twelfth embodiment of the present invention.
  • FIG. 18 (a) is a side sectional view
  • FIG. 18 (b) is a diagram of FIG. FIG.
  • This electrostatic dust collection system includes an electrostatic precipitator 200 provided in a main duct 215 and a unipolar DC type static eliminator 300D having a structure different from that shown in FIG. 16 provided in a sub duct 315 of a different system. Composed in combination.
  • the electrostatic precipitator 200, the portion of the static eliminator 300D excluding the static eliminator 304D, and the manner of coupling the main duct 215 and the sub duct 315 may be the same as those described with reference to FIG.
  • the static eliminator 304D includes a plurality of discharge wires 327 provided in parallel to a surface orthogonal to the air flow direction, and a plurality of ventilation holes 330 (see FIG. 18B) on the same surface orthogonal to the air flow direction. And a counter electrode 329 having a honeycomb structure provided at a position spaced apart from the discharge line 327 by a predetermined distance b.
  • the material of the discharge wire 327 shown in FIG. 18B may be the same as that of the discharge wire 218.
  • the counter electrode 220 is made of conductive resin or metal and is grounded, for example.
  • a negative DC high voltage ⁇ V1 for example, ⁇ 5 KV
  • ⁇ V1 for example, ⁇ 5 KV
  • a corona discharge is generated around the discharge wire 327, and the surrounding air is ionized to be ionized to a negative polarity.
  • ⁇ V1 for example, ⁇ 5 KV
  • the counter electrode 329 serves as a ground electrode for causing a corona discharge in the discharge line 327, and the generated air ions pass through the ventilation hole 330 having a relatively large opening D and are conveyed to the connecting portion 316. Is done.
  • the intensity of the corona discharge is also related to the distance b between the discharge line 327 and the counter electrode 329 (see FIG. 18A).
  • the distance b is selected in a range where more ions can be generated with a small amount of ozone generated (small discharge current).
  • this counter electrode 329 has a honeycomb structure, the peripheral portion of the ventilation hole 330 faces the discharge line 327. Since this peripheral portion has a small surface area (plate thickness) and is sharp, charged dust hardly accumulates in this portion. If charged dust does not accumulate, clogging does not occur and reverse ionization can be effectively prevented.
  • reverse ionization is a phenomenon in which dust accumulated on the counter electrode 329 is ionized by locally causing discharge breakdown, and + ions are attracted to and attached to the discharge line 327 side, resulting in a significant reduction in discharge efficiency. It is. If this reverse ionization does not occur, the discharge efficiency does not decrease. Therefore, the charge removal unit 304D according to the fourth embodiment can maintain high discharge efficiency for a long time, and can stably supply more air ions for a long time. .
  • the discharge wire 327 may replace with the said discharge wire 327 and may use the discharge needle (not shown) provided so that the front-end
  • discharge wire 327 may be divided into a plurality of groups, and positive and negative DC high voltages may be applied to each group.
  • an alternating high voltage may be applied to the discharge line 327 as described in FIG.
  • the counter electrode 329 is provided on the downstream side of the discharge line 327.
  • the counter electrode 329 may be provided on the upstream side of the discharge line 327 or may be provided on the upstream side and the downstream side of the discharge line 327.
  • the counter electrode 329 has a honeycomb structure, but the present invention is not limited to this.
  • the vent holes 330 may have other shapes such as a quadrangle, a triangle, a rhombus, and a circle. In this case, the same operation and effect as described above can be obtained.
  • the structure of the counter electrode 329 may be a mesh (wire net) structure in which conductive thin wires are knitted into a quadrangle, a rectangle, a rhombus, or the like.
  • a so-called punching metal structure in which an arbitrary polygon including a circle, a triangle, a rectangle, a rhombus, etc., an ellipse, or the like is punched at a high density on a conductive flat plate may be used.
  • FIG. 19 is a schematic configuration diagram of an electric dust collection system according to a thirteenth embodiment of the present invention.
  • FIG. 19A is a cross-sectional view in a side direction
  • FIG. 19B is a diagram of FIG. FIG.
  • This electric dust collection system is configured by combining an electrostatic precipitator 200 provided in a main duct 215 and a unipolar DC type static eliminator 300E provided in a sub duct 315 of a different system. The case where the produced
  • the connecting portion 316 is connected to the downstream side of the dust collecting portion 216 (actually, the electrostatic filter 212) in the main duct 215, and negative air ions generated in the sub duct 315 are downstream of the electrostatic filter 212.
  • a common fan 206 is provided in the vicinity of the upstream of the projector 208.
  • the air ionized by the static eliminating unit 304 ⁇ / b> B is sucked out to the main duct 215 side by the negative pressure generated in the main duct 215 by the common fan 206. Since it is not necessary to provide the fan 313 in the static eliminator 300E in this case, the static eliminator 300E can be configured in a small size and at low cost.
  • This static eliminator 300E serves as a panel static eliminator and neutralizes the entire fan 206 and projector 208, and the charged dust that has escaped from the dust collecting portion 216 is mixed with negative ions before reaching the fan 206, and is efficiently eliminated.
  • the discharged dust passes through the main duct 215 without adhering to the inner wall of the main duct 215, the fan 206, and the projector 208.
  • the fan 206 itself is likely to have heat and easily charged due to friction of the wings with the air.
  • the fan 206 is in the vicinity of the upstream side of the projector 208, so that the fan 206 can be efficiently combined with the projector 208. Cooled and neutralized.
  • the fan 206 may be provided on the downstream side of the projector 208.
  • the unipolar DC type static eliminator 304B is employed, but the present invention is not limited to this.
  • various types of static eliminators as described in FIGS. 15, 17, and 18 may be combined.
  • the electrostatic precipitator 200 is used to charge the dust to the positive polarity, but it may be configured to be charged to the negative polarity.
  • the static eliminator 300 can be configured with the polarity reversed as necessary.
  • the electric dust collection system of the present invention may be applied to, for example, a copying machine, a printer, various types of projection display devices (projectors), and an air cleaner (for example, a smoke separator or an air conditioner).

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Elimination Of Static Electricity (AREA)
  • Electrostatic Separation (AREA)

Abstract

L'invention concerne un appareil électrique de collecte de poussière comprenant : une partie chargement (414) qui charge les particules contenues dans l'air ; une partie collecte de poussière (416) qui capture les particules chargées par la partie chargement ; et une partie neutralisation (404) qui neutralise les particules chargées qui ont traversé la partie collecte de poussière. La partie chargement (414) comprend une pluralité de fils de décharge (418) disposés en parallèle sur une surface croisant perpendiculairement le sens d'écoulement de l'air, ainsi que des premières contre-électrodes de type plaque (420) disposées selon un intervalle prédéterminé, à des emplacements se faisant face sur les surfaces croisant perpendiculairement le sens d'écoulement de l'air, avec les fils de décharge (418) entre elles. La partie neutralisation (404) comprend une électrode de neutralisation (426) qui génère une douche d'ions des deux polarités dans un espace de ladite partie (404), ainsi qu'une plaque de masquage (417) qui régule l'écoulement d'air de sorte que les particules chargées qui ont traversé la partie collecte de poussière (416) traversent l'espace rempli par la douche d'ions dans la partie neutralisation.
PCT/JP2009/067264 2008-10-03 2009-10-02 Appareil et systeme electriques de collecte de poussiere WO2010038872A1 (fr)

Applications Claiming Priority (6)

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JP2008-258478 2008-10-03
JP2008258478 2008-10-03
JP2008-294350 2008-11-18
JP2008294350 2008-11-18
JP2008-302251 2008-11-27
JP2008302251 2008-11-27

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WO2013032990A1 (fr) * 2011-09-02 2013-03-07 Tessera, Inc. Fil d'émetteur ayant une section transversale à couches multiples
WO2019132554A1 (fr) 2017-12-27 2019-07-04 Samsung Electronics Co., Ltd. Appareil de charge et précipitateur
WO2020007549A1 (fr) * 2018-07-03 2020-01-09 Blueair Ab Purificateur d'air
CN111542396A (zh) * 2017-12-27 2020-08-14 三星电子株式会社 充电设备和除尘器
CN111906092A (zh) * 2020-07-14 2020-11-10 北京理工大学 一种基于双极性驻极体的低电压电除尘系统及其除尘方法
CN114570530A (zh) * 2022-04-02 2022-06-03 云森威尔智能环境（深圳）有限公司 一种自清洁静电除尘装置
WO2024041969A1 (fr) * 2022-08-26 2024-02-29 Cabinair Sweden Ab Dispositif de purification d'air

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WO2019132554A1 (fr) 2017-12-27 2019-07-04 Samsung Electronics Co., Ltd. Appareil de charge et précipitateur
CN111542396A (zh) * 2017-12-27 2020-08-14 三星电子株式会社 充电设备和除尘器
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CN111906092A (zh) * 2020-07-14 2020-11-10 北京理工大学 一种基于双极性驻极体的低电压电除尘系统及其除尘方法
CN111906092B (zh) * 2020-07-14 2022-03-29 北京理工大学 一种基于双极性驻极体的低电压电除尘系统及其除尘方法
CN114570530A (zh) * 2022-04-02 2022-06-03 云森威尔智能环境（深圳）有限公司 一种自清洁静电除尘装置
WO2024041969A1 (fr) * 2022-08-26 2024-02-29 Cabinair Sweden Ab Dispositif de purification d'air

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