WO2013165242A1 - Dispositif de déplacement de fluide - Google Patents

Dispositif de déplacement de fluide Download PDF

Info

Publication number
WO2013165242A1
WO2013165242A1 PCT/NL2013/050324 NL2013050324W WO2013165242A1 WO 2013165242 A1 WO2013165242 A1 WO 2013165242A1 NL 2013050324 W NL2013050324 W NL 2013050324W WO 2013165242 A1 WO2013165242 A1 WO 2013165242A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid displacement
displacement device
corona
corona electrode
tip
Prior art date
Application number
PCT/NL2013/050324
Other languages
English (en)
Inventor
Eliane Khoury
Vincent Adrian VONS
Hendrikus Johannes TIMMERMANS
Original Assignee
Virus Free Air B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Virus Free Air B.V. filed Critical Virus Free Air B.V.
Priority to CN201390000446.3U priority Critical patent/CN204380854U/zh
Priority to EP13723999.2A priority patent/EP2844393B1/fr
Publication of WO2013165242A1 publication Critical patent/WO2013165242A1/fr

Links

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
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/32—Transportable units, e.g. for cleaning room air
    • 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
    • B03C3/60—Use of special materials other than liquids
    • 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
    • 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
    • B03C2201/10—Ionising electrode has multiple serrated ends or parts
    • 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
    • B03C2201/14—Details of magnetic or electrostatic separation the gas being moved electro-kinetically

Definitions

  • the invention relates to a fluid displacement device, in particular a device for displacement of room air, here meaning air in residential spaces, offices or industrial premises.
  • the invention further relates to an air cleaning device for removing particulate material from a gas, in particular a device for cleaning of room air.
  • Particulate material in the context of the present invention relates to any type of airborne particle including microorganisms and viruses.
  • the invention further relates to a method of displacing air in a space.
  • Examples hereof are, among others, the outbreak of the Ebola virus, Foot and Mouth disease and the SARS epidemic. Human contact with and exposure to such pathogenic particulate material in the air is increasing, which results in a further increase in the risk of infection and spread of diseases.
  • the air quality is therefore of particular importance, particularly in environments where the chance of infection is high.
  • An example of such an environment is an operating room, where patients, often with open wounds, are susceptible to aerogenic pathogenic particulate material.
  • US4689056A discloses an air cleaner using ionic wind which comprises the features of the preamble of claim 1. However, the embodiments comprising needle electrodes produce ozone. US4689056A teaches by means of some embodiments that the generation of ozone could be decreased by using discharge electrodes in the form of parallel wires and keeping the voltage at the discharge electrodes low.
  • US4231766A discloses a two stage electrostatic precipitator with electric field induced airflow.
  • the device comprises ionizer wires to ionize the air.
  • the document further teaches the variation of airflow, ozone production and ionizer current with ionizer wire placement with respect to the counter electrode. To preclude the possibility of arcing between the ionizer wire and accelerator plates, sufficient spacing must be maintained between these components.
  • the object of the invention is to provide an improved fluid displacement device configured for generating a flow within a fluid, that could be used in an air cleaning device for removing particulate material from a gas, which overcomes at least one of the disadvantages mentioned before.
  • a fluid displacement device configured for generating a flow within a fluid, having the features of Claim 1.
  • Advantageous embodiments and further ways of carrying out the invention may be attained by the measures mentioned in the dependent claims.
  • the device further comprises a non-corona electrode downstream the corona electrodes.
  • the tips of the corona electrodes are positioned at a predefined distance from the non-corona electrode.
  • the proximal end of the elongated body joins the inner surface of the airflow duct at a distance from the non-corona electrode which is longer than the predefined distance.
  • the features of the present invention provide a construction of the corona electrodes with reduced aerodynamic drag or air resistance in the airflow duct. This enables to provide a fluid displacement device which needs only one pair of corona electrodes/non-corona electrode to generate a sufficient high flow output through a duct with reduced length as only one stage is needed.
  • the elongated body is rod-shaped. In an advantageous embodiment the elongated body has a straight body axis.
  • a line through the tip and proximal end of the elongated body forms an angle a with the inner surface, wherein 15° ⁇ a ⁇ 90°.
  • An angle in this range has been found optimal with respect to the minimal length of the duct.
  • a tip of a corona electrode has a tip pointing to the middle of the air flow duct downstream the tip.
  • This feature improves the ionization of the air molecules in the middle of the air flow duct, as a result of this the velocity of the air flow in the middle of the air flow duct is increased. This makes that the speed difference between the air flow in the middle and the air flow near the side walls is reduced, allowing reducing the maximum flow speed while the capacity of the flow though the device is not decreased.
  • the distal end comprises a coupling structure to attach a tip structure to the elongated body.
  • Such electrodes when manufactured from one piece are expensive and difficult to process into electrodes having an elongated body with the desired shape.
  • the features of this embodiment enable to provide corona electrodes with elongated body with reduced costs and excellent anticorrosive characteristics.
  • the elongated body could be made from an inexpensive electrically conductive material, whereas the relative small tip of the electrode could be made from an anticorrosive material.
  • the coupling structure provides the required conductivity between the elongated body and the tip. This feature further allows having corona electrodes of which the tip and elongated body are made from different conductive materials.
  • the airflow duct comprises a conductive ring-shaped element which forms a part of the inner surface of the airflow duct and the proximal ends of the corona electrodes are attached to the ring-shaped element.
  • the conductive ring-shaped element has an electrical resistivity p, wherein 0,001 ohm-metre ⁇ p ⁇ 1000 ohm-metre.
  • a conductive element of high resistivity material readily conducts a corona current. However, the material provides a voltage drop along current paths through the element. The material thereby damps or limits an incipient sparking event.
  • the conductive ring-shaped element may be a coating applied to the inner surface of the airflow duct. Examples of such relatively high resistance materials include polymers filled with carbon or other additives that increase conductivity, intrinsically conductive polymers, silicon, gallium arsenide, indium phosphide and silicon carbide.
  • the tips of the corona electrodes are placed circularly around a central axis of the airflow duct.
  • the tips are radially equidistant from each other. These features provide a well-conditioned airflow through the airflow duct.
  • the non-corona electrode is a ring- shaped element which forms a part of the inner surface of the airflow duct.
  • a ring-shaped non-corona electrode has a lower air resistance than a grid-shaped non-corona electrode and thus provides a better airflow through the device.
  • the non-corona electrode may be in the form of a coating annularly applied to the inner surface of the airflow duct.
  • the fluid displacement device further comprises a ionizing structure disposed in the airflow duct, the ionizing structure comprising a cylindrical non-corona electrode which forms a part of the inner surface of the airflow duct, and a central corona electrode having a tip, wherein the tip is positioned in the airflow duct upstream the cylindrical non-corona electrode at a cylinder axis of the cylindrical-shaped non-corona electrode.
  • the corona electrodes with elongated body ionize up to 95% of the particles in the airflow without generating ozone.
  • an electrostatic filter which is positioned downstream, the device will capture utmost 95% of the particles.
  • An air cleaning device suitable for use in a hospital needs to capture more than 95% of the particles from the airflow.
  • the features of this embodiment enable to increase the ionization of particles up to 99,99% and thus the cleaning efficiency.
  • This ionizing structure has almost no negative influence on the airflow through the device.
  • the cylindrical non-corona electrode of the ionizing structure and the non-corona electrode of the airflow generation structure are the same element. This feature enables to reduce the length of the duct.
  • the number of corona electrodes of the airflow generation structure and the central corona electrode of the ionizing structure are electrically coupled and the tip of the central corona electrode is positioned in the airflow duct downstream the number corona electrodes and has a distance from the non-corona electrode which is at least the predefined distance.
  • a tip of the corona electrodes comprises a multitude of conductive wires forming a broom. This type of corona electrodes is expected to have better characteristics with respect to corrosion than the type of corona electrode having only one sharp pointed distal end.
  • the method comprises providing a fluid displacement device comprising the essential features of the invention in a space of a building and turning on the air cleaning device.
  • Figure 1 shows schematically a sectional view of a first embodiment of the invention
  • Figure 2 shows schematically a side view of the first embodiment
  • Figure 3 shows schematically a side view of a second embodiment
  • Figure 4 shows schematically a sectional view of a third embodiment
  • Figure 5 shows schematically a sectional view of an embodiment of a corona electrode
  • Figure 6 shows schematically a sectional view of another embodiment of a corona electrode
  • Figure 7 shows schematically a sectional view of a fourth embodiment
  • Figure 8 shows schematically a sectional view of a fifth embodiment
  • Figure 9 shows schematically a side view of the fourth and fifth embodiment
  • Figure 10 shows schematically a sectional view of a first embodiment of an air cleaning device comprising fluid displacement devices according to the invention
  • Figure 11 shows schematically a side view of the embodiment shown in figure 10.
  • Figure 12 shows schematically a sectional view of a second embodiment of an air cleaning device comprising fluid displacement devices according to the invention.
  • contaminated gas flow' is understood to mean the gas flow with particulate material admitted into the housing through the inlet opening of the housing.
  • purified gas flow' refers to the gas flow leaving the outlet opening of the housing.
  • articulate material' is understood in this patent to mean all the particulate material or airborne particles present in a gas, including micro-organisms, bacteria and viruses, but for instance also dust particles.
  • fluid refers to any gaseous substance.
  • Fig. 1 shows schematically a sectional view of a first embodiment of a fluid displacement device 2 according to the invention.
  • the fluid displacement device 2 comprises a housing which forms an airflow duct 4 of the fluid displacement device.
  • the airflow duct 4 is configured to accommodate a gas flow 1 to flow from an inlet 4A to an outlet 4B of the fluid displacement device 2.
  • the gas flow flowing to the inlet 4A is indicated with reference 1 A.
  • Reference 1 indicates the gas flow through the airflow duct 4 and reference IB indicates the gas flow coming out of the airflow duct 4.
  • the fluid displacement device 2 comprises a number of corona electrodes 6 A and a non-corona electrode 6B disposed in the housing 4.
  • the corona electrodes 6 A comprises a structure having a rod shaped elongated body 6A2 with a distal end 61 and a proximal end 62 and a tip structure 6A1.
  • the tip structure is provided at the distal end 61.
  • the tip structure 6A1 has a sharp pointed end configured to generate a corona discharge.
  • a ring-shaped conductive element 6A3 is provided in the housing 4 and forms a part of the inner surface 4C of the channel through the housing 4.
  • the proximal end 62 of the elongated body 6A2 is coupled to the ring-shaped conductive element 6A3. This could be by means of clamping, welding or soldering.
  • the ring-shaped conductive element 6A3 could comprise openings in which the proximal ends 62 are clamped.
  • the non-corona electrode 6B is in the form of a ring-shaped element which forms a part of the inner surface 4C of the airflow duct 4.
  • the ring-shaped element 6A3 is coupled to a high voltage pole 11 A of a first high voltage source 11.
  • the ring-shaped non-corona electrode 6B is coupled to a reference voltage pole 1 IB of the first high voltage source 11.
  • the reference pole 11 A is coupled to ground.
  • the potential difference between the high voltage pole 11 A and the reference voltage pole 1 IB of the first high voltage source 11 is in the range of 8 - 25 kV, preferably in the range of 14 - 18 kV.
  • the reference voltage pole 1 IB is coupled to electrical ground.
  • the elongated body 6A2 shown in Fig. 1 has a straight body axis.
  • a line through the tip 6A1 and the location where the proximal end 62 joins the inner surface of the airflow duct has an angle a with the inner surface.
  • the angle a could be in a range between 15° and 90°.
  • the tips 6A1, i.e. the end of the corona electrode configured to generate a corona discharge, are positioned at a predefined distance d from the non-corona electrode. This distance corresponds to the shortest distance between a surface of the corona electrode and non-corona electrode.
  • the distance between the tips of the corona electrodes and the non-corona electrodes is in the range of 1 - 5cm.
  • a line defined by the shortest distance between the corona electrode and the non-corona electrode has an angle ⁇ with respect to the inner surface of the duct.
  • the relation between angle a and angle ⁇ is defined by the following equation a ⁇ 90° - ⁇ /2.
  • a tip structure 6A1 of a corona electrodes has a longitudinal body axis. The longitudinal body axis is oblique to the gas flow and pointing to a center of the air of the air flow duct downstream the tip of the corona electrode.
  • a tip of a corona electrode not located at the center of the air flow duct has a tip pointing to the middle of the air flow duct downstream the tip.
  • the pointing direction of the tip corresponds to the angle a of the straight body axis of the elongated body 6A2.
  • Fig. 2 shows a side view of the embodiment shown in Fig. 1 wherein Fig. 1 is a cross section along the line I-I in Fig. 2.
  • the device is seen from the inlet side in a direction parallel to the airflow through the device.
  • the embodiment comprises four needle-like corona electrodes 6A positioned in a circular duct 4 with an inner surface 4C.
  • the four needle-like corona electrodes 6A are placed circularly around a central axis of the duct.
  • the distal ends of electrodes have the same radial distance from the center of the circular duct 4.
  • the tips of the corona electrodes 6A are radially equidistant from each other and radially equally distributed along a cross section of the duct, i.e.
  • Fig. 3 shows an embodiment of a device having eight circularly placed needle-like corona electrodes 6A. The number of electrodes depends on the dimensions of the duct.
  • the elongated bodies of the corona electrodes are attached to the inner surface 4C of a ring-shaped conductive element 6A3 which is positioned in the housing 4, wherein the inner surface 4C of the element 6 A3 forms at the same time the inner surface of the duct.
  • the housing 4 comprises opening for passing the elongated body of the electrodes from the inner side of the housing 4 to the outer side of the housing.
  • the proximal ends of the elongated bodies are in said latter case electrically coupled to the high voltage source outside the housing 4.
  • Fig. 4 shows schematically a sectional view of a third embodiment.
  • the elongated body is not a body with a straight body axis but a body with a curved body axis.
  • the line through the tip 6A1 and the location where the proximal end 62 joins the inner surface of the airflow duct is indicated with reference 63.
  • the body axis of the elongated body could have any curvature as long as the tip of the electrode has the shortest distance to the non-corona electrode 6B.
  • the body axis at the proximal end 62 is perpendicular to the housing 4 of the duct.
  • a slanted hole has to be provided to pass the straight elongated body.
  • the corona electrodes could be made from one piece.
  • the distal end 61 is the cross section along the body axis of the electrode where the elongated body 6A2 passes into the tip structure.
  • Fig. 5 shows schematically a sectional view of an embodiment of a corona electrode wherein the corona electrode is made from to two parts, the elongated body part 6A2 and the tip part 6A1.
  • two different types of conductive materials could be used to assemble the corona electrode.
  • the elongated body part could be made from a cheap and easy to manufacture and handle material, for example a metal, alloy or conductive plastic.
  • the tip part could be made from a harsh anticorrosive material such as tungsten or could comprise a core of corrosive material, for example iron, which is covered with a coating of platinum or any other material that is resistant to a corona discharge environment.
  • a mutually compatible coupling structure Fig. 5 shows a hole in the distal end of the elongated body 6A2. An extension of the tip part is inserted and clamped in the hole.
  • the tip part 6A1 has a needle like structure.
  • the tip part 6 ⁇ is composed of bundled carbon fibers forming a broom.
  • JP2008112714 discloses the use of bundled carbon fibers to form a tip of a corona electrode used in an ion wind generator.
  • Figure 7 shows schematically a sectional view of a fourth embodiment of a fluid displacement device.
  • the fluid displacement devices described before have a charging efficiency in the range of 60 - 80%. This means that 60 - 80% of the particles in the flow are charged and 40% - 20 % of the particles are not charged. This means that when the fluid displacement device is used in front of an electrostatic filter, 20 - 40% of the particles in the airflow will not be captured by the electrostatic filter.
  • the fourth embodiment has improved charging efficiency wherein up to 99,9% of the particles in the fluid flow are charged.
  • the fourth embodiment comprises a flow generation section 6 and an ionizing section 7 both disposed in the housing 4.
  • the flow generation section 6 comprises the corona electrodes 61 and ring shaped non-corona electrode 6B is described in the first embodiment.
  • the ionizing section 7 is disposed in the housing 4 downstream the flow generation section.
  • the ionizing section 7 comprises a central corona electrode 7 A and a cylindrical or ring-shaped non-corona electrode 7B.
  • the inner surface of the cylindrical non-corona electrode 7B forms a part of the inner surface 4C of the airflow duct.
  • the tip of the central corona electrode 7A is positioned on the cylinder axis of the ring-shaped non-corona electrode 7B.
  • the central corona electrode 7A is coupled to a high voltage pole 12A of a second high voltage source 12.
  • the ring-shaped non-corona electrode 7B is coupled to a reference voltage pole 12B of the second high voltage source 12.
  • the reference pole 12A is coupled to ground.
  • the potential difference between the high voltage pole 12A and the reference voltage pole 12B of the second high voltage source 12 is in the range of 8 - 25 kV, preferably in the range of 14 - 18 kV.
  • the reference voltage pole 12B is coupled to electrical ground.
  • an ionizing section 7 described above has a charging efficiency of 99,9%, whereas a fluid displacement section 6 described above has optimal flow generation characteristics.
  • a fluid displacement device is obtained with optimal flow characteristic and a charging efficiency which makes the fluid displacement device suitable for use in an air cleaning device.
  • the order of flow generation section 6 and ionizing section 7 has almost no effect on the charging efficiency and generated flow.
  • the first and second high voltage source might be the same voltage source.
  • the corona electrodes 6A of the flow generation section and the central corona electrode 7A of the ionization section are then coupled to the same high voltage pole.
  • Figure 8 shows schematically a sectional view of a fifth embodiment, wherein the flow generation section and ionizing section are combined in to one section.
  • the central corona electrode 7A of the ionization section is coupled to the ring shaped element 6A3 to which the corona electrodes 6A of the flow generation section are coupled.
  • the cylindrical non-corona electrode 7B of the ionizing section and the non-corona electrode 6B of the flow generation section are the same element.
  • the tip of the central corona electrode 7 A of the ionization section is positioned in the duct at a distance ⁇ downstream the tips of the corona electrodes 6 A of the flow generation section.
  • the corona electrode of the ionizing section has at least the distance d to the common non-corona electrode 6B, 7B.
  • the position on the central axis 13 of the duct 4 which has a distance d to the non-corona electrode 6B, 7B is Amax downstream the tips of the corona electrodes 6A of the flow generation section. It has been found that when the distance between the tip of the corona electrode of the ionizing section and the common non-corona electrode is larger than the distance d between the tips of the corona electrodes of the flow generation section and the common non-corona electrode, the production of ozone can be reduced further without reducing the charging efficiency.
  • Fig 9 shows schematically a side view of the fourth and fifth embodiment wherein Fig.
  • FIG. 8 is a cross section along the line VII- VII in Fig. 9.
  • the device is seen from the inlet side in a direction parallel to the airflow through the device.
  • the tip of the central corona electrode is positioned on the central axis 13 of the tubular duct.
  • the tubular housing 4 of the airflow duct is composed of three parts.
  • the first part 41 is the ring-shaped conductive element 6A3 to which the corona electrodes 6A are coupled.
  • the second part 42 is the ring-shaped conductive element 6B, 7B forming the common non-corona electrode.
  • the third part 43 is a ring-shaped element of non-conductive material.
  • the ring-shaped conductive elements 6A3 and 6B may be made from any type of conductive material, including metal and alloys. However, the conductive ring- shaped elements may have an electrical resistivity p, wherein 0,001 ohm-metre ⁇ p ⁇ 1000 ohm-metre.
  • An advantage of a conductive element of high resistivity material is that it readily conducts a corona current without a large voltage drop along the current path.
  • the material provides a large voltage drop along current paths through the element due to a spark.
  • the material thereby damps or limits an incipient sparking event.
  • An example of a relative high resistance material is a polymer filled with carbon, for example carbon filled polycarbonate.
  • An advantage of a carbon filled plastic is that it allows one to produce the conductive elements by an injection moulding process or pultrusion process.
  • Both the ring-shaped conductive element 6A3 and the ring-shaped non-corona electrode 6B could have identical dimensions. This enables us to produce elements with the same mould. By boring through holes in a ring-shaped conductive element the openings are created to clamp the proximal end of the elongated body of the corona electrodes and to provide an electrical connection between the electrode and the ring-shaped element.
  • the conductive ring-shaped elements 6A3 and 6B may also be in the form of a conductive coating applied to the inner surface of the airflow duct.
  • the conductive coating may be any type of conductive coating, however a coating having a relative high electrical resistivity p in the range of 0,001 ohm- metre - 1000 ohm- metre have the advantage described above.
  • Examples of such relatively high resistance materials include polymers filled with carbon or other additives that increase conductivity, intrinsically conductive polymers, silicon, gallium arsenide, indium phosphide and silicon carbide.
  • Figs 10 and 11 show schematically a sectional view and side view of a first embodiment of an air cleaning device comprising fluid displacement devices according to the invention.
  • the air cleaning device 21 comprises an ionization stage 67 and collecting stage 8 disposed in a common housing 14.
  • the housing 14 has an inlet 14A and an outlet 14B.
  • the ionizing stage 67 comprises a multitude of fluid displacement devices as shown in Fig. 8.
  • the collecting part 8 is in the form of an electrostatic filter. In principle any type of electrostatic filter could be used to trap the ionized particles which are ionized in the ionization stage 67.
  • the collecting part 8 comprises a stack 8A of metal plates with a space between each of the metal plates.
  • the spaces between the metal plates form a passage to pass the gas flow through the stack of plates along the surface of plates.
  • the plates of the stack of plates 8A are alternately connected to a high voltage pole 10A and a reference pole 10B of a high voltage source 10.
  • the plates coupled to the high voltage pole 10A are referred to as high voltage plates and the plates coupled to the reference pole 10A are referred to as reference voltage plates.
  • the reference pole 10B is in the embodiment connected to ground.
  • the potential difference between the high voltage pole 10A and the reference pole 10B is in the range of 4 - 20 kV, preferably in the range of 4 - 10 kV, more preferable in the range of 4 - 8 kV.
  • the distance between two neighbouring plates forming the space depends on the application of the air cleaning device and is in the range of 4 - 20mm.
  • the minimal length of the space in the direction of the airflow has a relationship with the used potential difference, the speed of the airflow and the distance between two neighbouring plates.
  • the stack of plates 8A could be in the form a detachable or removable unit comprising the stack of plates.
  • the unit (not shown) comprises further a high voltage terminal to couple the high voltage plates to the high voltage pole 10A and a reference voltage terminal to couple the reference plates to the reference pole 10B.
  • a detachable unit allows one to clean the stack of plates periodically, for example washing by hand under a tap or in a dishwashing machine.
  • the surfaces of the plates are provided with an antimicrobial coating to kill the micro-organisms that are trapped on the surface of the plates.
  • the surfaces of the plates are provided with a dirt repellent coating, to facilitate cleaning of the stack of plates 8A.
  • the coating could be both an antimicrobial coating and dirt repellent coating.
  • the air cleaning device comprising a fluid displacement device according to the inventions functions as follows. Contaminated gas is present in the space of the ionizing part 67. A potential difference is applied between the corona electrodes 6A, 7A and the non-corona electrode 6B. When the potential difference between two adjacent electrodes is high enough, a corona discharge will occur around the tips of the corona electrodes 6A, 7A. Ionization of the nearby molecules results in generation of ionized air molecules having the same polarity as that of the charged tip. Subsequently, the tip repels the like-charged ion cloud, and the ion cloud immediately expands due to the repulsion between the ions themselves.
  • the ions Under the influence of the applied electric field the ions are accelerated, from the corona electrodes 6 A in the direction of the non-corona electrode 6B. During the movement of the ions collisions will occur between the ions and neutral gas molecules, which causes transfer of kinetic energy between ions and molecules. In this way, the gas in the ionizing part is forced to move from the corona electrodes 6A in the direction of the non-corona electrode 6B. This is the so-called corona wind, which causes a gas flow through the airflow duct 4 and consequently from the inlet opening 14 A to outlet opening 14B of the common housing 14. Furthermore, the ionized particles attach to particulate material in the intake air and charge the particulates.
  • the charged particulates will move along the electric field in the direction of the non-corona electrode 6B.
  • the gas flow depends on the potential difference applied by the high- voltage source 11.
  • the gas flow with ionized particles will flow through the ring-shaped non-corona electrode 6B and only a small part of the ionized particles in the gas flow will be trapped by the non-corona electrode 6B.
  • the airflow with ionized particles flows through the space between the plates of the stack of plates 8A.
  • the ionized particles which have generally a positive charge are repelled by the plates connected to the voltage pole 10A of the high voltage source having the highest potential and attracted by the plates connected to the pole 10B of the voltage source having the lowest potential.
  • the stack of plates 8A functions in a similar way as the stack of plates of commonly known electrostatic precipitators.
  • the ionization stage 67 comprises four fluid displacement devices having a short tubular housing 4.
  • Fig. 11 shows schematically the four fluid displacement devices seen from the inlet 14A of the air cleaning device 21.
  • the fluid displacement devices are placed in an array of 2x2 elements.
  • Four needle-like corona electrodes 6A are placed circularly around a central axis 13 of the tubular housing 4.
  • the tips of the corona electrodes 6A are radially equidistant from each other and radially equally distributed around a centre of tubular housing 4.
  • the tips of the corona electrodes 6A are positioned circularly in the tubular housing 4 and have a distance from the inner surface of the tubular housing 4.
  • the tubular housing 4 is made from three parts as shown in Fig. 8.
  • a first separation wall 20 A and second separation wall 20B are provided between the exterior of the tubular housing 4 of the fluid displacement devices to prevent an air backflow between the fluid displacement devices from the outlet to the inlet.
  • the first and second separation wall may be made from a conductive material, for example metal. In this way, the first separation wall electrically couples all corona electrodes to the high voltage pole 11 A and the second separation wall electrically couples all non-corona electrodes to the reference pole 1 IB.
  • each fluid displacement device will generate an amount of airflow through the tubular housing from the inlet to the outlet.
  • the tubular housing 4 forms a duct with a radius of 69 mm and comprises 9 corona electrodes 6A and one central electrode 7A.
  • the distance between a tip of the 9 corona electrode and non-corona electrode is about 25 mm.
  • a potential difference of 16 kV is applied to the corona electrodes and non-corona electrode a single fluid displacement device is able to generate an airflow of 10 - 15 m 3 /h.
  • the tip of the central electrode 7A is positioned 2 - 7 mm downstream the tips of the 9 corona electrodes.
  • FIG. 12 shows schematically a sectional view of a second embodiment of an air cleaning device comprising fluid displacement devices according to the invention.
  • This embodiment differs from the first embodiment of an air cleaning device in that the ring shaped non-corona electrode is replaced by a plane grid 6B' with openings to pass the airflow.
  • the fluid displacement devices 6 further comprises only corona electrodes 6A which are radially equidistant from each other and equally distributed along a cross section of the inner surface of the tubular housing 4.
  • a fluid displacement device with a plane grid electrode has a charging efficiency of 95%. It has been found that central corona electrode does not improve the charging efficiency nor the flow through the fluid displacement device. Therefore, a central corona electrode is omitted. For some applications of an air cleaning device a cleaning efficiency of 95% is sufficient.
  • An air cleaning device with four tubular fluid displacement devices each with a number of five corona electrodes as shown in Fig. 10 is just chosen as an example to illustrate the invention. Parameters of the air cleaning device such as the required capacity, size of a cross section of a tubular element and differential voltage will determine the number of fluid displacement devices and number of electrodes in each fluid displacement device.
  • tubular housing with a circular cross section a tubular housing with angled cross section could be used.
  • the corona electrodes 6A may be in the form of carbon fibre rods.
  • Such carbon rod is a composite of carbon fibres and a binding agent, for instance epoxy resin, vinyl ester resin or polyester resin, formed into rods by for instance pultrusion.
  • the material of carbon fibre rods suitable for use in kites can also be used as corona electrodes.
  • the elongated body and tip are made from the same material.
  • the tip of a corona electrode is sharp pointed. Due to the harsh environment of the corona region around the tip, the form of the tip changes in time. Therefore, the tip of a corona electrode is not necessarily a part next to the elongated body but could be the distal end of the elongated body. The tip could thus have any form, i.e. sharp pointed, curved, rounded, and could also be a flat distal end of the elongated body. During use, a flat distal end will become a curved tip.
  • the ring shaped non-corona electrode described above should not necessarily be in the form of a contiguous ring of conductive material.
  • the ring shaped non-corona electrode could also be in the form of two or more conductive elements, wherein each element forms a part of the annular inner surface of the airflow duct.
  • the two or more conductive elements are electrically coupled to the same potential and have all a minimal distance d to a tip of a corona electrode.
  • the two or more conductive elements together have to be considered as one ring shaped non-corona electrode.
  • the fluid displacement device according to the present invention does not need a fan to generate the flow of air. This makes the device very silent and thus applicable in rooms and spaces where background noise should be prevented such as classrooms, rooms in hospitals, conference rooms and bedrooms.
  • an air cleaning device comprising a fluid displacement device according to the invention enables us to provide a mobile air cleaning device and to install the mobile device in a room where the air has to be cleaned. No additional inlet and outlet provisions have to be present in said room.
  • the technology of the invention enables to provide fluid displacement devices suitable for the consumer market which could be used in a similar way as a household electric fan with propeller style blades. A consumer can take the device in the room where he wants the air to be circulated and in case of an air cleaning device to be cleaned.

Landscapes

  • Electrostatic Separation (AREA)

Abstract

L'invention concerne un dispositif (2) de déplacement de fluide configuré pour générer un écoulement au sein d'un fluide. Le dispositif de déplacement de fluide comporte une gaine (4) d'écoulement d'air présentant une surface intérieure (4C) configurée pour recevoir un écoulement de fluide. Plusieurs électrodes (6A) à effluve sont disposées dans la gaine d'écoulement d'air, chacune des électrodes à effluve comportant un corps allongé (6A2) doté d'une extrémité distale (61) et d'une extrémité proximale (62). L'extrémité distale est munie d'une structure (6A1) de pointe configurée pour générer un effluve. Une électrode (6B) sans effluve est disposée en aval de les électrodes à effluve, les pointes (6A1) des électrodes (6A) à effluve sont positionnées à une distance (d) prédéfinie de l'électrode (6B) sans effluve et l'extrémité proximale rejoint la surface intérieure de la gaine (4) d'écoulement d'air à une distance de l'électrode sans effluve qui est supérieure à la distance d prédéfinie.
PCT/NL2013/050324 2012-05-01 2013-05-01 Dispositif de déplacement de fluide WO2013165242A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201390000446.3U CN204380854U (zh) 2012-05-01 2013-05-01 流体驱替装置
EP13723999.2A EP2844393B1 (fr) 2012-05-01 2013-05-01 Dispositif de déplacement de fluide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2008735A NL2008735C2 (en) 2012-05-01 2012-05-01 Fluid displacement device.
NL2008735 2012-05-01

Publications (1)

Publication Number Publication Date
WO2013165242A1 true WO2013165242A1 (fr) 2013-11-07

Family

ID=48468717

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2013/050324 WO2013165242A1 (fr) 2012-05-01 2013-05-01 Dispositif de déplacement de fluide

Country Status (4)

Country Link
EP (1) EP2844393B1 (fr)
CN (1) CN204380854U (fr)
NL (1) NL2008735C2 (fr)
WO (1) WO2013165242A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104841558A (zh) * 2014-02-18 2015-08-19 布鲁雅尔公司 具有电离装置的空气净化器设备
US9636617B2 (en) 2014-02-18 2017-05-02 Blueair Ab Air purifier device with fan duct
US9919252B2 (en) 2014-02-18 2018-03-20 Blueair Ab Air purifier device with coupling mechanism
WO2019182504A1 (fr) * 2018-03-22 2019-09-26 Blueair Cabin Air Ab Agencement d'ionisation
WO2020078573A1 (fr) * 2018-10-19 2020-04-23 1-Nano B.V. Collecteur de particules
EP3517208B1 (fr) * 2018-01-24 2022-03-23 BSH Hausgeräte GmbH Unité filtrante pour un dispositif d'épuration d'air

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106801952B (zh) * 2017-03-30 2022-03-18 谢红卫 室内等离子静电空气净化设备及运行方法
US10219364B2 (en) 2017-05-04 2019-02-26 Nxp Usa, Inc. Electrostatic microthruster
DE102017121195A1 (de) * 2017-09-13 2019-03-14 Valeo Klimasysteme Gmbh Fahrzeugklimaanlagen-Auslasseinheit
US10236163B1 (en) 2017-12-04 2019-03-19 Nxp Usa, Inc. Microplasma generator with field emitting electrode

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231766A (en) 1978-12-11 1980-11-04 United Air Specialists, Inc. Two stage electrostatic precipitator with electric field induced airflow
US4689056A (en) 1983-11-23 1987-08-25 Nippon Soken, Inc. Air cleaner using ionic wind
US4789801A (en) 1986-03-06 1988-12-06 Zenion Industries, Inc. Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same
JPH11342350A (ja) * 1998-06-01 1999-12-14 Sharp Corp 空気清浄機
JP2004253192A (ja) * 2003-02-18 2004-09-09 Keyence Corp 除電装置および除電装置用脱着ユニット
US20050194583A1 (en) * 2004-03-02 2005-09-08 Sharper Image Corporation Air conditioner device including pin-ring electrode configurations with driver electrode
WO2005102535A1 (fr) * 2004-04-22 2005-11-03 Techin Ag Procede et dispositif d'affaiblissement de particules de gaz d'echappement emis par des moteurs
JP2008112714A (ja) 2006-10-05 2008-05-15 Vector:Kk イオン風発生装置
CN101577397A (zh) * 2009-06-04 2009-11-11 西安交通大学 一种高速、大面积离子风的激励装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2003259C2 (en) * 2009-07-22 2011-01-25 Univ Delft Tech Method for the removal of a gaseous fluid and arrangement therefore.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231766A (en) 1978-12-11 1980-11-04 United Air Specialists, Inc. Two stage electrostatic precipitator with electric field induced airflow
US4689056A (en) 1983-11-23 1987-08-25 Nippon Soken, Inc. Air cleaner using ionic wind
US4789801A (en) 1986-03-06 1988-12-06 Zenion Industries, Inc. Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same
JPH11342350A (ja) * 1998-06-01 1999-12-14 Sharp Corp 空気清浄機
JP2004253192A (ja) * 2003-02-18 2004-09-09 Keyence Corp 除電装置および除電装置用脱着ユニット
US20050194583A1 (en) * 2004-03-02 2005-09-08 Sharper Image Corporation Air conditioner device including pin-ring electrode configurations with driver electrode
WO2005102535A1 (fr) * 2004-04-22 2005-11-03 Techin Ag Procede et dispositif d'affaiblissement de particules de gaz d'echappement emis par des moteurs
JP2008112714A (ja) 2006-10-05 2008-05-15 Vector:Kk イオン風発生装置
CN101577397A (zh) * 2009-06-04 2009-11-11 西安交通大学 一种高速、大面积离子风的激励装置

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104841558A (zh) * 2014-02-18 2015-08-19 布鲁雅尔公司 具有电离装置的空气净化器设备
EP2908064A1 (fr) * 2014-02-18 2015-08-19 Blue Air AB Dispositif de purification d'air avec des moyens d'ionisation
JP2015150558A (ja) * 2014-02-18 2015-08-24 ブルーエアー・エービー イオン化手段を備えた空気清浄装置
US9636617B2 (en) 2014-02-18 2017-05-02 Blueair Ab Air purifier device with fan duct
US9694369B2 (en) 2014-02-18 2017-07-04 Blueair Ab Air purifier device with ionizing means
US9919252B2 (en) 2014-02-18 2018-03-20 Blueair Ab Air purifier device with coupling mechanism
EP3517208B1 (fr) * 2018-01-24 2022-03-23 BSH Hausgeräte GmbH Unité filtrante pour un dispositif d'épuration d'air
WO2019182504A1 (fr) * 2018-03-22 2019-09-26 Blueair Cabin Air Ab Agencement d'ionisation
US11831131B2 (en) 2018-03-22 2023-11-28 Cabinair Sweden Ab Ionizing arrangement
WO2020078573A1 (fr) * 2018-10-19 2020-04-23 1-Nano B.V. Collecteur de particules

Also Published As

Publication number Publication date
NL2008735C2 (en) 2013-11-04
EP2844393B1 (fr) 2021-07-07
EP2844393A1 (fr) 2015-03-11
CN204380854U (zh) 2015-06-10

Similar Documents

Publication Publication Date Title
EP2844393B1 (fr) Dispositif de déplacement de fluide
EP1169131B1 (fr) Epurateur d'air
US7806952B2 (en) Apparatus, system, and method for enhancing air purification efficiency
US10807103B2 (en) Device for cleaning of indoor air
KR101678237B1 (ko) 공기 정화 장치
JP2017070949A (ja) 電子空気浄化器、およびその関連するシステム、ならびにその方法
EP3010644B1 (fr) Dispositif de nettoyage d'un écoulement de gaz
JPH10501175A (ja) 静電繊維フィルター
TW201719085A (zh) 空氣清淨裝置和設備
US20150013541A1 (en) Electrostatic Precipitation Air Filter
KR101651034B1 (ko) 전기집진기 및 그 전기집진기를 포함하는 공기청정 시스템
JP2007007589A (ja) 電気集塵デバイス及びこれを組込んだ空気清浄装置
AU2008200150A1 (en) High speed tunnel fan with electrostatic filter
WO2017114049A1 (fr) Système d'élimination de particules en suspension dans un milieu gazeux
WO1992005875A1 (fr) Appareil servant a generer et a nettoyer un flux d'air
US20230140445A1 (en) Electrostatic separator
Botvinnik et al. High-efficiency portable electrostatic air cleaner with insulated electrodes (January 2007)
JP2011161355A (ja) 集塵装置
CN210373804U (zh) 静电除尘模块和空气处理装置
JP2020078516A (ja) 空気清浄装置
CN103357505B (zh) 一种空气净化器用电极及空气净化器
TWI793557B (zh) 粒子捕捉裝置
JP2023097751A (ja) 空気清浄機
JP2022147333A (ja) 荷電装置及び空気清浄機
TW202420671A (zh) 放電裝置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201390000446.3

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13723999

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2013723999

Country of ref document: EP