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WO2018089666A1 - Electrostatic air purification device and air purifier - Google Patents

Electrostatic air purification device and air purifier Download PDF

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Publication number
WO2018089666A1
WO2018089666A1 PCT/US2017/060907 US2017060907W WO2018089666A1 WO 2018089666 A1 WO2018089666 A1 WO 2018089666A1 US 2017060907 W US2017060907 W US 2017060907W WO 2018089666 A1 WO2018089666 A1 WO 2018089666A1
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WO
WIPO (PCT)
Prior art keywords
electrode
dust collection
purification device
air purification
air
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.)
Ceased
Application number
PCT/US2017/060907
Other languages
French (fr)
Inventor
Wen Jun YU
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Nuwave LLC
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Nuwave LLC
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Filing date
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Publication of WO2018089666A1 publication Critical patent/WO2018089666A1/en
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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
    • B03C3/02—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
    • B03C3/025—Combinations of electrostatic separators, e.g. in parallel or in series, stacked separators or dry-wet separator combinations
    • 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
    • B03C3/06—Plant or installations having external electricity supply dry type characterised by presence of stationary tube 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
    • B03C3/02—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
    • B03C3/34—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
    • B03C3/40—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
    • 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
    • B03C3/49—Collecting-electrodes tubular
    • 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
    • B03C3/60—Use of special materials other than liquids
    • B03C3/64—Use of special materials other than liquids synthetic resins
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present application relates to the technical field of air purification. More specifically, the invention relates to an electrostatic air purification device and an air purifier.
  • a charged electrode and a dust collection electrode in an air purification device are the same component.
  • the air between a discharge electrode and the charged electrode (the dust collection electrode) needs to be ionized, and in addition, dust in the air also needs to be sucked. Therefore, a voltage between the discharge electrode and the charged electrode (the dust collection electrode) is not set too high (usually around 7000 V). If a high voltage is chosen, a large amount of ozone is produced and exceeds a standard (according to the national standard), and even air breakdown is caused, such that purification of the air purification device fails and components in the air purification device are damaged. However, if the voltage is too low, a dust collection effect of the air purification device is undesirable.
  • Cida Patent No. CN201510836945.1 discloses an electrode structure, a dust collection method, and an air purifier, where a first electrode and a second electrode are included.
  • the first electrode enables the passing air to be ionized to produce ions.
  • Particles in the air take an electrical charge and the charged particles form ionic wind in an electrical field by applying the electrical field.
  • the charged particles are preliminarily collected.
  • the second electrode further collects the charged particles.
  • voltages of the first electrode and the second electrode in this patent have a small adjustable range, and during dust collection, only one of the two metal plates has a dust collection function, thus reducing dust collection efficiency.
  • An electrostatic air purification device and an air purifier are provided which have advantages such as power saving, energy conservation, and high dust collection efficiency, where a structure in which a discharge electrode, a charged electrode, and a dust collection electrode are separated is used, and voltages applied between the electrodes do not interfere with each other and can be adjusted in a large range.
  • An electrostatic air purification device includes a dust collection unit for ionizing and sucking up particulates in air and a fan for guiding the air to flow towards the dust collection unit, where the dust collection unit includes a power source, a discharge electrode, a charged electrode, and a dust collection electrode which are successively disposed along an airflow direction.
  • the power source includes a first electrode and a second electrode which are opposite in polarity.
  • the discharge electrode is electrically connected to the first electrode, and the charged electrode and the dust collection electrode are both electrically connected to the second electrode.
  • the first electrode is a cathode or an anode of the power source.
  • the charged electrode includes several metal plates arranged in parallel, and the metal plates are parallel to the airflow direction and are electrically connected to the second electrode.
  • a metal wire electrically connected to the first electrode is suspended between two adjacent metal plates of the charged electrode, and a cantilever end of the metal wire forms the discharge electrode.
  • an air duct for the air to pass through is formed between the two metal plates; the air duct includes an air inlet and an air outlet; and the cantilever end of the metal wire is provided at the air inlet and is arranged at a middle position between two adjacent metal plates.
  • the dust collection electrode is a cellular structure formed by several metal sheets.
  • a resin with a high resistance value is coated on both surfaces of the metal sheet, and the resin is made of a PP or PVC material.
  • a voltage applied between the discharge electrode and the charged electrode is lower than that applied between the discharge electrode and the dust collection electrode.
  • the dust collection electrode includes at least two cellular structures successively connected in series along the airflow direction.
  • the present system further provides an air purifier, including housing and an electrostatic air purification device inside the housing, where the electrostatic air purification device is the electrostatic air purification device.
  • the electrostatic air purification device and the air purifier use a structure in which a discharge electrode, a charged electrode, and a dust collection electrode are separated, and enable voltages applied between the electrodes not to interfere with each other and to be adjusted in a large range. Therefore, the voltage between the discharge electrode and the charged electrode and the voltage between the discharge electrode and the dust collection electrode can be adjusted according to different requirements, so as to achieve a more power-saving and energy-conserving effect.
  • the dust collection electrode of a cellular structure is used, such that the dust collection electrode uses the fewest materials, and has the lowest air resistance and the largest effective dust collection area, thus reducing production costs and enhancing dust collection efficiency.
  • FIG. 1 is a schematic structural diagram of an electrostatic air purification device according to the present system
  • FIG. 2 is a schematic diagram showing a dust collection electrode in FIG. 1 observed along an airflow direction;
  • FIG. 3 is a cutaway view of a metal sheet in FIG. 2;
  • FIG. 4 is a schematic diagram showing that a dust collection electrode of an electrostatic air purification device is formed by connecting multiple cellular structures in series according to the present system.
  • an electrostatic air purification device includes a dust collection unit 1 for ionizing air, charging particulates in the air, and sucking up the charged particulates, and a fan 2 for guiding the air to flow towards the dust collection unit 1.
  • the dust collection unit 1 includes a power source 3, and a discharge electrode 4, a charged electrode 5, and a dust collection electrode 6 which are successively disposed along an airflow direction.
  • the power source 3 includes a first electrode 7 and a second electrode 8 which are opposite in polarity.
  • the discharge electrode 4 is electrically connected to the first electrode 7, and the charged electrode 5 and the dust collection electrode 6 are electrically connected to the second electrode 8.
  • the air is guided by the fan 2 to enter the dust collection unit 1, and ionized between the discharge electrode 4 and the charged electrode 5, such that the particulates in the air take electrical charge.
  • the charged electrode 5 is electrically connected to the second electrode 8 of the power source 3, and the electrical charge taken by the charged electrode 5 and that taken by the particulates are opposite in polarity. Therefore, the charged electrode 5 can suck up the charged particulates. After the charged particulates are preliminarily sucked up by the charged electrode 5, residual charged particulates smoothly flow into the dust collection electrode 6 along the airflow direction under the effect of the fan 2.
  • the dust collection electrode 6 is also electrically connected to the second electrode 8 of the power source 3, and therefore can suck up the residual charged particulates, thus achieving an air purification objective.
  • the discharge electrode 4 and the charged electrode 5 are mainly used to ionize the air, such that the particulates in the air are charged, and the charged electrode 5 sucks up a small quantity of particulates.
  • the dust collection electrode 6 has a more obvious sucking effect, and can powerfully suck up the residual charged particulates.
  • the present system uses a structure in which the discharge electrode 4, the charged electrode 5, and the dust collection electrode 6 are separated, and enables voltages applied between the electrodes not to interfere with each other and to be adjusted in a large range.
  • the voltage between two electrodes may be adjusted according to the quantity of the particulates in the air. That is, when the quantity of the particulates in the air is large, the voltage between the discharge electrode 4 and the charged electrode 5 and the voltage between the discharge electrode 4 and the dust collection electrode 6 may be separately increased. Thus, the air between the discharge electrode 4 and the charged electrode 5 is ionized at a higher degree, the particulates are more easily sucked up by the charged electrode 5 and the dust collection electrode 6, and a sucking capability of the dust collection electrode 6 is strengthened.
  • the quantity of the particulates in the air gradually decreases. Therefore, by separately reducing the voltage between the discharge electrode 4 and the charged electrode 5 and the voltage between the discharge electrode 4 and the dust collection electrode 6, the air can be purified and further the usage of electricity can be reduced, thus achieving an energy-conservation effect.
  • the first electrode 7 may be a cathode or an anode of the power source 3.
  • the second electrode 8 is the anode of the power source 3
  • the discharge electrode 4 electrically connected to the cathode of the power source 3 is a negative corona.
  • a corona produced when the negative corona discharges has a high current, such that the air passing through the discharge electrode 4 is ionized to a higher degree and the particulates are more easily sucked up by the charged electrode 5 and the dust collection electrode 6, thus enhancing purification efficiency.
  • the first electrode 7 is the anode of the power source 3
  • the second electrode 8 is the cathode of the power source 3
  • the discharge electrode 4 electrically connected to the anode of the power source 3 is a positive corona.
  • the positive corona discharges, the thickness of ozone produced by the discharge electrode 4 is low, thus decreasing an amount of ozone produced during use of the air purification device.
  • the charged electrode 5 may be formed by several metal plates 9 arranged in parallel.
  • the metal plates 9 are parallel to the airflow direction and are electrically connected to the cathode of the power source 3.
  • the several metal plates 9 are arranged in a straight line, that is, the several metal plates 9 are located at the same height and two adjacent metal plates 9 are equal in distance.
  • An air duct 11 for the air to pass through is formed between two metal plates 9. After the air at the discharge electrode 4 is ionized and the particulates in the air take electrical charge, as the air flows through the air duct 11, the metal plates 9 may suck up the charged particulates because the electrical charge taken by the particulates and that taken by the metal plates 9 are opposite in polarity.
  • a metal wire 10 electrically connected to the first electrode 7 is suspended between two adjacent metal plates 9 of the charged electrode 5, and a cantilever end of the metal wire 10 forms the discharge electrode 4.
  • the suspension in the present system means that the metal wire 10 is provided between two metal plates 9 and contacts neither of the two metal plates 9.
  • the metal wire 10 is parallel to the metal plate 9, one end of the metal wire 10 is electrically connected to the first electrode 7, and the other end is the cantilever end.
  • the metal wire 10 extends between the two metal plates 9, such that a voltage is formed between the discharge electrode 4 at a free end of the metal wire 10 and each of the two metal plates 9. Therefore, the two metal plates 9 can both suck up the charged particulates under the effect of an electrical field.
  • the charged electrode 5 in the present system uses several metal plates 9 which are arranged in parallel in a straight line, and the metal wire 10 extends between two adjacent metal plates 9, such that both surfaces of each provided metal plate 9 achieve a dust collection effect, and accordingly dust collection efficiency of the charged electrode 5 is higher.
  • the air duct 11 for the air to pass through may be formed between two metal plates 9, and the air duct 11 includes an air inlet 12 and an air outlet 13.
  • the cantilever end of the metal wire 10 is provided at the air inlet 12, such that the particulates in the air are sucked up by the charged electrode 5 immediately after being charged at the air inlet 12 of the air duct 11.
  • Such a design maximizes an effective particulate sucking area of the metal plate 9, and enhances the dust collect efficiency of the charged electrode 5.
  • the cantilever end of the metal wire 10 is provided at a middle position between two adjacent metal plates 9, and therefore voltages between the metal wire 10 and each of the two metal plates 9 are equal, such that the two metal plates 9 have the same capability of sucking up the charged particulates.
  • the dust collection electrode 6 may be a cellular structure encircled by several metal sheets 14, and the cellular structure includes several hexagonal through holes.
  • An axial line of the through hole is parallel to an airflow direction, the hexagonal through hole includes six identical sides, and each side is formed by one metal sheet 14.
  • the residual charged particulates enter the though holes of the dust collection electrode 6 with the air, and are sucked up by the metal sheets 14 because the electrical charge taken by the metal sheets 14 and the electrical charge taken by the charged particulates are opposite in polarity.
  • the dust collection electrode is designed in a cellular structure, such that materials used by the dust collection electrode are reduced and air resistance thereof is decreased.
  • the architecture strength of the dust collection electrode 6 is higher and the area thereof is larger, such that an area of the dust collection electrode 6 for effectively sucking up the charged particulates is increased, the dust collection efficiency of the dust collection electrode 6 is enhanced, production costs are reduced, and an economic benefit is improved.
  • the dust collection electrode 6 undertakes most of the dust collection tasks during operation, most of the charged particulates in the air are sucked up by the dust collection electrode 6. After the dust collection electrode 6 is used for a long time, a thick layer of dirt adheres onto the metal sheets 14. In this case, the dust collection electrode 6 needs to be cleaned. However, because the dust collection electrode 6 is formed by rather thin metal sheets 14, the metal sheets 14 easily wear after being repeatedly cleaned, thus reducing the strength of the metal sheets 14 and shortening the service life of the metal sheets 14.
  • resin 15 is coated on both surfaces of each metal sheet 14, thus enhancing wear resistance of the metal sheet 14 and prolonging the service life of the metal sheet 14.
  • the resin 15 may be resin 15 with a high resistance value, for example, resin 15 made of a PP material or a PVC material.
  • the dust collection electrode 6 has a strong capability of holding static electricity.
  • the dust collection electrode 6 may still hold high-voltage static electricity, and therefore can maintain a dust collection capability for a long time.
  • a discontinuous power supply manner may be used. That is, when the dust collection electrode 6 has a high static-electricity voltage, the power source 3 is turned off and power supply is stopped, and after a period of time, power supply continues when the high static-electricity voltage reduces to a particular value. In this manner, the air purification device can better save power and energy during use. Moreover, because air ionization produces ozone, a power supply time consumed by the power source 3 is shortened by using the discontinuous power supply manner, and the amount of produced ozone is also reduced consequently.
  • the voltage applied between the discharge electrode 4 and the charged electrode 5 may be lower than that applied between the discharge electrode 4 and the dust collection electrode 6.
  • the air is ionized when passing between the discharge electrode 4 and the charged electrode 5, such that the particulates in the air are charged.
  • the discharge electrode 4 and the charged electrode 5 are mainly used to ionize the air and charge the particulates.
  • the dust collection function of the charged electrode 5 is not the primary function, and therefore a relatively low voltage is applied. Thus, on the one hand, the particulates are charged and a preliminary dust collection objective is achieved; on the other hand, a low voltage does not incur air breakdown, a purification failure, and damage to components in the purification device, and further reduces production of ozone.
  • the dust collection electrode 6 is mainly used to fully suck up the residual charged particles. Therefore, a relatively high voltage is applied between the discharge electrode 4 and the dust collection electrode 6, such that the efficiency of sucking up the charged particulates by the dust collection electrode 6 is redoubled, and accordingly the air purification device outputs high-proportion clean air.
  • the dust collection electrode 6 may include at least two cellular structures successively connected in series along the airflow direction.
  • the voltage between the cellular structure and the discharge electrode 4 gradually increases with the airflow direction. In this way, the charged particulates in the air may be sucked up in several steps, thus greatly improving a sucking capability of the air purification device. Therefore, the air purification device outputs high-proportion clean air.
  • the present system further provides an air purifier, which includes housing and an electrostatic air purification device provided inside the housing.
  • the electrostatic air purification device is any electrostatic air purification device in the foregoing technical solution. An operation principle and an application of the air purifier have been described in the foregoing technical solution in detail, and therefore are not described in detail herein again.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)

Abstract

The present system discloses an electrostatic air purification device, which includes a dust collection unit for ionizing and sucking up particulates in the air and a fan for guiding the air to flow towards the dust collection unit, where the dust collection unit includes a power source, and a discharge electrode, a charged electrode, and a dust collection electrode which are successively disposed along an airflow direction; the power source is provided with a first electrode and a second electrode which are opposite in polarity; the discharge electrode is electrically connected to the first electrode, and the charged electrode and the dust collection electrode are electrically connected to the second electrode. The present system further discloses an air purifier, which includes housing and an electrostatic air purification device provided inside the housing. The electrostatic air purification device is an electrostatic air purification device described in the foregoing technical solution. The electrostatic air purification device and the air purifier of the present system have such advantages as power saving, energy conservation, and high dust collection efficiency.

Description

ELECTROSTATIC AIR PURIFICATION DEVICE AND AIR PURIFIER
FIELD OF THE INVENTION
[0001] The present application relates to the technical field of air purification. More specifically, the invention relates to an electrostatic air purification device and an air purifier.
BACKGROUND OF THE INVENTION
[0002] In the prior art, a charged electrode and a dust collection electrode in an air purification device are the same component. The air between a discharge electrode and the charged electrode (the dust collection electrode) needs to be ionized, and in addition, dust in the air also needs to be sucked. Therefore, a voltage between the discharge electrode and the charged electrode (the dust collection electrode) is not set too high (usually around 7000 V). If a high voltage is chosen, a large amount of ozone is produced and exceeds a standard (according to the national standard), and even air breakdown is caused, such that purification of the air purification device fails and components in the air purification device are damaged. However, if the voltage is too low, a dust collection effect of the air purification device is undesirable.
[0003] A novel electrode structure has been disclosed in the prior art. For example, Chinese Patent No. CN201510836945.1 discloses an electrode structure, a dust collection method, and an air purifier, where a first electrode and a second electrode are included. The first electrode enables the passing air to be ionized to produce ions. Particles in the air take an electrical charge and the charged particles form ionic wind in an electrical field by applying the electrical field. The charged particles are preliminarily collected. The second electrode further collects the charged particles. However, voltages of the first electrode and the second electrode in this patent have a small adjustable range, and during dust collection, only one of the two metal plates has a dust collection function, thus reducing dust collection efficiency.
[0004] Until the invention of the present application, these and other problems in the prior art went either unnoticed or unsolved by those skilled in the art. The present invention provides an air purification system which solves these and other problems without sacrificing important features such as design, style or affordability. SUMMARY OF THE INVENTION
[0005] The present system intends to solve the technical problems mentioned above. An electrostatic air purification device and an air purifier are provided which have advantages such as power saving, energy conservation, and high dust collection efficiency, where a structure in which a discharge electrode, a charged electrode, and a dust collection electrode are separated is used, and voltages applied between the electrodes do not interfere with each other and can be adjusted in a large range.
[0006] Embodiments of the present system are implemented by using combinations of the disclosed technical features. An electrostatic air purification device includes a dust collection unit for ionizing and sucking up particulates in air and a fan for guiding the air to flow towards the dust collection unit, where the dust collection unit includes a power source, a discharge electrode, a charged electrode, and a dust collection electrode which are successively disposed along an airflow direction. The power source includes a first electrode and a second electrode which are opposite in polarity. The discharge electrode is electrically connected to the first electrode, and the charged electrode and the dust collection electrode are both electrically connected to the second electrode.
[0007] Preferably, the first electrode is a cathode or an anode of the power source.
[0008] Preferably, the charged electrode includes several metal plates arranged in parallel, and the metal plates are parallel to the airflow direction and are electrically connected to the second electrode.
[0009] Preferably, a metal wire electrically connected to the first electrode is suspended between two adjacent metal plates of the charged electrode, and a cantilever end of the metal wire forms the discharge electrode.
[0010] Preferably, an air duct for the air to pass through is formed between the two metal plates; the air duct includes an air inlet and an air outlet; and the cantilever end of the metal wire is provided at the air inlet and is arranged at a middle position between two adjacent metal plates.
[0011] Preferably, the dust collection electrode is a cellular structure formed by several metal sheets.
[0012] Preferably, a resin with a high resistance value is coated on both surfaces of the metal sheet, and the resin is made of a PP or PVC material.
[0013] Preferably, a voltage applied between the discharge electrode and the charged electrode is lower than that applied between the discharge electrode and the dust collection electrode. [0014] Preferably, the dust collection electrode includes at least two cellular structures successively connected in series along the airflow direction.
[0015] The present system further provides an air purifier, including housing and an electrostatic air purification device inside the housing, where the electrostatic air purification device is the electrostatic air purification device.
[0016] The beneficial effects are as follows: compared with the prior art, the electrostatic air purification device and the air purifier use a structure in which a discharge electrode, a charged electrode, and a dust collection electrode are separated, and enable voltages applied between the electrodes not to interfere with each other and to be adjusted in a large range. Therefore, the voltage between the discharge electrode and the charged electrode and the voltage between the discharge electrode and the dust collection electrode can be adjusted according to different requirements, so as to achieve a more power-saving and energy-conserving effect. In addition, the dust collection electrode of a cellular structure is used, such that the dust collection electrode uses the fewest materials, and has the lowest air resistance and the largest effective dust collection area, thus reducing production costs and enhancing dust collection efficiency.
Brief Description of the Drawings
[0017] Specific implementation manners of the present system are further described in detail below, wherein:
[0018] FIG. 1 is a schematic structural diagram of an electrostatic air purification device according to the present system;
[0019] FIG. 2 is a schematic diagram showing a dust collection electrode in FIG. 1 observed along an airflow direction;
[0020] FIG. 3 is a cutaway view of a metal sheet in FIG. 2; and
[0021] FIG. 4 is a schematic diagram showing that a dust collection electrode of an electrostatic air purification device is formed by connecting multiple cellular structures in series according to the present system.
DETAILED DESCRIPTION OF EMBODIMENTS
[0022] While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail at least one preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to any of the specific embodiments illustrated.
[0023] As shown in FIG. 1, an electrostatic air purification device includes a dust collection unit 1 for ionizing air, charging particulates in the air, and sucking up the charged particulates, and a fan 2 for guiding the air to flow towards the dust collection unit 1. The dust collection unit 1 includes a power source 3, and a discharge electrode 4, a charged electrode 5, and a dust collection electrode 6 which are successively disposed along an airflow direction. The power source 3 includes a first electrode 7 and a second electrode 8 which are opposite in polarity. The discharge electrode 4 is electrically connected to the first electrode 7, and the charged electrode 5 and the dust collection electrode 6 are electrically connected to the second electrode 8. The air is guided by the fan 2 to enter the dust collection unit 1, and ionized between the discharge electrode 4 and the charged electrode 5, such that the particulates in the air take electrical charge.
[0024] The charged electrode 5 is electrically connected to the second electrode 8 of the power source 3, and the electrical charge taken by the charged electrode 5 and that taken by the particulates are opposite in polarity. Therefore, the charged electrode 5 can suck up the charged particulates. After the charged particulates are preliminarily sucked up by the charged electrode 5, residual charged particulates smoothly flow into the dust collection electrode 6 along the airflow direction under the effect of the fan 2.
[0025] The dust collection electrode 6 is also electrically connected to the second electrode 8 of the power source 3, and therefore can suck up the residual charged particulates, thus achieving an air purification objective. The discharge electrode 4 and the charged electrode 5 are mainly used to ionize the air, such that the particulates in the air are charged, and the charged electrode 5 sucks up a small quantity of particulates. The dust collection electrode 6 has a more obvious sucking effect, and can powerfully suck up the residual charged particulates. Moreover, the present system uses a structure in which the discharge electrode 4, the charged electrode 5, and the dust collection electrode 6 are separated, and enables voltages applied between the electrodes not to interfere with each other and to be adjusted in a large range. Therefore, the voltage between two electrodes may be adjusted according to the quantity of the particulates in the air. That is, when the quantity of the particulates in the air is large, the voltage between the discharge electrode 4 and the charged electrode 5 and the voltage between the discharge electrode 4 and the dust collection electrode 6 may be separately increased. Thus, the air between the discharge electrode 4 and the charged electrode 5 is ionized at a higher degree, the particulates are more easily sucked up by the charged electrode 5 and the dust collection electrode 6, and a sucking capability of the dust collection electrode 6 is strengthened.
[0026] After the indoor air is constantly purified by the electrostatic air purification device of the present system, the quantity of the particulates in the air gradually decreases. Therefore, by separately reducing the voltage between the discharge electrode 4 and the charged electrode 5 and the voltage between the discharge electrode 4 and the dust collection electrode 6, the air can be purified and further the usage of electricity can be reduced, thus achieving an energy-conservation effect.
[0027] The first electrode 7 may be a cathode or an anode of the power source 3. When the first electrode 7 is the cathode of the power source 3, the second electrode 8 is the anode of the power source 3, and the discharge electrode 4 electrically connected to the cathode of the power source 3 is a negative corona. A corona produced when the negative corona discharges has a high current, such that the air passing through the discharge electrode 4 is ionized to a higher degree and the particulates are more easily sucked up by the charged electrode 5 and the dust collection electrode 6, thus enhancing purification efficiency. When the first electrode 7 is the anode of the power source 3, the second electrode 8 is the cathode of the power source 3, and the discharge electrode 4 electrically connected to the anode of the power source 3 is a positive corona. When the positive corona discharges, the thickness of ozone produced by the discharge electrode 4 is low, thus decreasing an amount of ozone produced during use of the air purification device.
[0028] The charged electrode 5 may be formed by several metal plates 9 arranged in parallel. The metal plates 9 are parallel to the airflow direction and are electrically connected to the cathode of the power source 3. The several metal plates 9 are arranged in a straight line, that is, the several metal plates 9 are located at the same height and two adjacent metal plates 9 are equal in distance. An air duct 11 for the air to pass through is formed between two metal plates 9. After the air at the discharge electrode 4 is ionized and the particulates in the air take electrical charge, as the air flows through the air duct 11, the metal plates 9 may suck up the charged particulates because the electrical charge taken by the particulates and that taken by the metal plates 9 are opposite in polarity.
[0029] A metal wire 10 electrically connected to the first electrode 7 is suspended between two adjacent metal plates 9 of the charged electrode 5, and a cantilever end of the metal wire 10 forms the discharge electrode 4. The suspension in the present system means that the metal wire 10 is provided between two metal plates 9 and contacts neither of the two metal plates 9. The metal wire 10 is parallel to the metal plate 9, one end of the metal wire 10 is electrically connected to the first electrode 7, and the other end is the cantilever end. The metal wire 10 extends between the two metal plates 9, such that a voltage is formed between the discharge electrode 4 at a free end of the metal wire 10 and each of the two metal plates 9. Therefore, the two metal plates 9 can both suck up the charged particulates under the effect of an electrical field. Compared with the prior art in which one metal plate 9 is used to collect dust, the charged electrode 5 in the present system uses several metal plates 9 which are arranged in parallel in a straight line, and the metal wire 10 extends between two adjacent metal plates 9, such that both surfaces of each provided metal plate 9 achieve a dust collection effect, and accordingly dust collection efficiency of the charged electrode 5 is higher.
[0030] The air duct 11 for the air to pass through may be formed between two metal plates 9, and the air duct 11 includes an air inlet 12 and an air outlet 13. The cantilever end of the metal wire 10 is provided at the air inlet 12, such that the particulates in the air are sucked up by the charged electrode 5 immediately after being charged at the air inlet 12 of the air duct 11. Such a design maximizes an effective particulate sucking area of the metal plate 9, and enhances the dust collect efficiency of the charged electrode 5. The cantilever end of the metal wire 10 is provided at a middle position between two adjacent metal plates 9, and therefore voltages between the metal wire 10 and each of the two metal plates 9 are equal, such that the two metal plates 9 have the same capability of sucking up the charged particulates.
[0031] As shown in FIG. 2, the dust collection electrode 6 may be a cellular structure encircled by several metal sheets 14, and the cellular structure includes several hexagonal through holes. An axial line of the through hole is parallel to an airflow direction, the hexagonal through hole includes six identical sides, and each side is formed by one metal sheet 14. The residual charged particulates enter the though holes of the dust collection electrode 6 with the air, and are sucked up by the metal sheets 14 because the electrical charge taken by the metal sheets 14 and the electrical charge taken by the charged particulates are opposite in polarity. The dust collection electrode is designed in a cellular structure, such that materials used by the dust collection electrode are reduced and air resistance thereof is decreased. However, the architecture strength of the dust collection electrode 6 is higher and the area thereof is larger, such that an area of the dust collection electrode 6 for effectively sucking up the charged particulates is increased, the dust collection efficiency of the dust collection electrode 6 is enhanced, production costs are reduced, and an economic benefit is improved.
[0032] Because the dust collection electrode 6 undertakes most of the dust collection tasks during operation, most of the charged particulates in the air are sucked up by the dust collection electrode 6. After the dust collection electrode 6 is used for a long time, a thick layer of dirt adheres onto the metal sheets 14. In this case, the dust collection electrode 6 needs to be cleaned. However, because the dust collection electrode 6 is formed by rather thin metal sheets 14, the metal sheets 14 easily wear after being repeatedly cleaned, thus reducing the strength of the metal sheets 14 and shortening the service life of the metal sheets 14.
[0033] Therefore, as shown in FIG. 3, resin 15 is coated on both surfaces of each metal sheet 14, thus enhancing wear resistance of the metal sheet 14 and prolonging the service life of the metal sheet 14. The resin 15 may be resin 15 with a high resistance value, for example, resin 15 made of a PP material or a PVC material. Thus, the dust collection electrode 6 has a strong capability of holding static electricity.
[0034] When the power source 3 for the air purification device is turned off and does not supply power, the dust collection electrode 6 may still hold high-voltage static electricity, and therefore can maintain a dust collection capability for a long time. During use of the dust collection electrode 6, a discontinuous power supply manner may be used. That is, when the dust collection electrode 6 has a high static-electricity voltage, the power source 3 is turned off and power supply is stopped, and after a period of time, power supply continues when the high static-electricity voltage reduces to a particular value. In this manner, the air purification device can better save power and energy during use. Moreover, because air ionization produces ozone, a power supply time consumed by the power source 3 is shortened by using the discontinuous power supply manner, and the amount of produced ozone is also reduced consequently.
[0035] The voltage applied between the discharge electrode 4 and the charged electrode 5 may be lower than that applied between the discharge electrode 4 and the dust collection electrode 6. The air is ionized when passing between the discharge electrode 4 and the charged electrode 5, such that the particulates in the air are charged. The discharge electrode 4 and the charged electrode 5 are mainly used to ionize the air and charge the particulates. The dust collection function of the charged electrode 5 is not the primary function, and therefore a relatively low voltage is applied. Thus, on the one hand, the particulates are charged and a preliminary dust collection objective is achieved; on the other hand, a low voltage does not incur air breakdown, a purification failure, and damage to components in the purification device, and further reduces production of ozone. The dust collection electrode 6 is mainly used to fully suck up the residual charged particles. Therefore, a relatively high voltage is applied between the discharge electrode 4 and the dust collection electrode 6, such that the efficiency of sucking up the charged particulates by the dust collection electrode 6 is redoubled, and accordingly the air purification device outputs high-proportion clean air.
[0036] As shown in FIG. 4, the dust collection electrode 6 may include at least two cellular structures successively connected in series along the airflow direction. The voltage between the cellular structure and the discharge electrode 4 gradually increases with the airflow direction. In this way, the charged particulates in the air may be sucked up in several steps, thus greatly improving a sucking capability of the air purification device. Therefore, the air purification device outputs high-proportion clean air.
[0037] The present system further provides an air purifier, which includes housing and an electrostatic air purification device provided inside the housing. The electrostatic air purification device is any electrostatic air purification device in the foregoing technical solution. An operation principle and an application of the air purifier have been described in the foregoing technical solution in detail, and therefore are not described in detail herein again.
[0038] The foregoing embodiments are merely used to describe the technical solution of the present system and are not intended to limit the present system. Any modification or equivalent replacement made without departing from the spirit and scope of the present system shall fall within the scope of the technical solution of the present system.

Claims

CLAIMS What is claimed is:
1. An electrostatic air purification device, comprising
a dust collection unit for ionizing and sucking up particulates in air and a fan for guiding the air to flow towards the dust collection unit, wherein the dust collection unit comprises a power source, and a discharge electrode, a charged electrode, and a dust collection electrode which are successively disposed along an airflow direction;
the power source comprises a first electrode and a second electrode which are opposite in polarity;
the discharge electrode is electrically connected to the first electrode, and the charged electrode and the dust collection electrode are both electrically connected to the second electrode.
2. The electrostatic air purification device according to claim 1, wherein the first electrode is a cathode or an anode of the power source.
3. The electrostatic air purification device according to claim 1, wherein the charged electrode comprises several metal plates arranged in parallel, and the metal plates are parallel to the airflow direction and are electrically connected to the second electrode.
4. The electrostatic air purification device according to claim 3, wherein a metal wire electrically connected to the first electrode is suspended between two adjacent metal plates of the charged electrode, and a cantilever end of the metal wire forms the discharge electrode.
5. The electrostatic air purification device according to claim 4, wherein an air duct for the air to pass through is formed between the two metal plates and the air duct comprises an air inlet and an air outlet, and the cantilever end of the metal wire is provided at the air inlet and is arranged at a middle position between two adjacent metal plates.
6. The electrostatic air purification device according to claim 1, wherein the dust collection electrode is a cellular structure formed by several metal sheets.
7. The electrostatic air purification device according to claim 6, further comprising a resin with a high resistance value coated on both surfaces of the metal sheet, and the resin is made of a PP or PVC material.
8. The electrostatic air purification device according to claim 1, wherein a voltage applied between the discharge electrode and the charged electrode is lower than that applied between the discharge electrode and the dust collection electrode.
9. The electrostatic air purification device according to claim 6, wherein the dust collection electrode comprises at least two cellular structures successively connected in series along the airflow direction.
10. An air purifier, comprising housing and an electrostatic air purification device provided inside the housing, wherein the electrostatic air purification device is the electrostatic air purification device according to any one of claims 1 to 9.
PCT/US2017/060907 2016-11-10 2017-11-09 Electrostatic air purification device and air purifier Ceased WO2018089666A1 (en)

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