EP0039669B1 - Electrostatic air filter - Google Patents

Electrostatic air filter Download PDF

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Publication number
EP0039669B1
EP0039669B1 EP19810890074 EP81890074A EP0039669B1 EP 0039669 B1 EP0039669 B1 EP 0039669B1 EP 19810890074 EP19810890074 EP 19810890074 EP 81890074 A EP81890074 A EP 81890074A EP 0039669 B1 EP0039669 B1 EP 0039669B1
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EP
European Patent Office
Prior art keywords
high tension
fact
potential
separating
plates
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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.)
Expired
Application number
EP19810890074
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German (de)
French (fr)
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EP0039669A2 (en
EP0039669A3 (en
Inventor
Carl Maria Dr. Fleck
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Fleck Carl Maria Dr
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Fleck Carl Maria Dr
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Priority claimed from AT239780A external-priority patent/AT372301B/en
Application filed by Fleck Carl Maria Dr filed Critical Fleck Carl Maria Dr
Publication of EP0039669A2 publication Critical patent/EP0039669A2/en
Publication of EP0039669A3 publication Critical patent/EP0039669A3/en
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Publication of EP0039669B1 publication Critical patent/EP0039669B1/en
Expired legal-status Critical Current

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    • 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
    • B03C3/16—Plant or installations having external electricity supply wet type
    • 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

Definitions

  • the invention relates to an electrostatic air filter with an ionization part and a separating part which is composed of separating plates which are alternately under high voltage and earthed.
  • Electrical air filter devices such as those used predominantly in the household, have an ionizing part and a separating part.
  • the ionization part mostly consists of discharge electrodes, preferably thin wires at a corresponding high voltage potential, and counter electrodes, which are generally at ground potential and thus define an electric field with the discharge electrodes, which leads to the formation of ions around the discharge electrodes.
  • the separating part of the device generally consists of electrically conductive plates arranged in parallel to one another, which are alternately at earth potential and at high voltage potential, so that an electrical field is formed between them, in which the charged dust particles migrate to the corresponding plate and are separated there.
  • a wire-shaped discharge electrode generally requires voltages between 12 and 15 kV, while the separating part requires plate voltages between 3 and 6 kV.
  • the separation voltage of 6 kV is only used in combination with the 12 kV ionization voltage, since the production of two different high voltages is then simple using a transformer with a 6 kV peak voltage and two rectifiers, which work for the discharge electrode in a voltage doubling circuit.
  • the disadvantages bought with it are unfortunately very large. Separation plates that can withstand a voltage of 6 kV not only have to be particularly well insulated, they also have to be far apart. This leads to an expensive construction and a large space requirement, since an appropriate plate surface must be available for the separation of a certain amount of dust.
  • DE-A-1 127 332 discloses an arrangement according to which the plates are charged from the electric field.
  • the arrangement provides for the current drawn by these plates to be derived via a resistance to earth.
  • This has the disadvantage that relatively high currents have to be collected from the ionization part of the electrostatic filter in order to generate a corresponding voltage drop across the resistor. For this reason, these charging plates have to be brought close to the ionization wire. If the plates are short-circuited, which occurs when the amount of dirt collected is too large, spark gaps are created to the discharge wires, which lead to the filter being unable to function.
  • the object of the invention is now primarily to make electrostatic filters cheaper and more reliable, to greatly reduce the necessary charging current of the plates, on the one hand to arrange them further away from the discharge wires and on the other hand to be able to reduce the power of the high-voltage unit.
  • the lower high-voltage genus of the separating plates is completely insulated and is not conductively connected to any defined potential, and in that each completely insulated separating plate is arranged directly opposite a discharge electrode, so that the high voltage of the separating plate is only due to its position and its Distance to the opposite discharge electrode of the ionization part is determined.
  • FIG. 1 shows the geometrical arrangement and the circuit diagram of a special embodiment of the invention
  • FIG. 2 shows an enlarged detail of the arrangement shown in FIG. 1 with the indicated course of the field lines.
  • the discharge wires 11 shown in section are brought to a potential of about 12 kV by the high voltage source 12.
  • Grounded plates 13 and insulated mounted separating plates 14, which are electrically connected to no defined potential and are at a high voltage of approximately 3 kV, are alternately arranged in the air flow downwards.
  • FIG. 2 shows an enlarged detail of the exemplary embodiment described in FIG. 1 with an indicated field line course, from which the mode of operation of the invention can be seen.
  • the field lines run from the discharge wire 11 to the grounded separating plates 13.
  • the isolated separating plate 14 will attract 15 field lines with its edge closest to the discharging wire 11 as long as its potential is below the potential prevailing at the point 15 without a separating plate 14.
  • ions emanating from the discharge wire 11 will also hit the plate 14 and charge until their edge 15 begins to repel the field lines emanating from the discharge wire.
  • This plate 14 will now hold its potential until some minority ions of the other polarity have discharged it so far that it is again forced to recharge via the points 15 closest to the discharge wire.
  • the separating plate 14 endeavors to keep its potential exactly at the value which prevails at the point 15 when the plate 14 is removed. This makes it possible to set the separation voltage completely freely in a very large interval, for example between 2 kV and 10 kV, by selecting the distance between the plate 14 and the wire 11.
  • the simplification of the electrostatic air filter according to the invention also works satisfactorily if it is a wet electrostatic precipitator in which the ions are released into the air via an electrically charged liquid aerosol.

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  • Electrostatic Separation (AREA)

Description

Die Erfindung betrifft einen elektrostatischen Luftfilter mit einem lonisationsteil und einem Abscheideteil, der sich aus abwechselnd unter Hochspannung stehenden und geerdeten Abscheideplatten zusammensetzt. Elektrische Luftfiltergeräte, wie sie im Haushalt überwiegend verwendet werden, besitzen einen lonisierungsteil und einen Abscheideteil. Der lonisierungsteil besteht meistens aus Entladungselektroden, vorzugsweise dünnen Drähten auf entsprechendem Hochspannungspotential, und Gegenelektroden, die sich im allgemeinen auf Erdpotential befinden und so mit den Entladungselektroden ein elektrisches Feld definieren, das zur Bildung von Ionen um die Entladungselektroden führt.The invention relates to an electrostatic air filter with an ionization part and a separating part which is composed of separating plates which are alternately under high voltage and earthed. Electrical air filter devices, such as those used predominantly in the household, have an ionizing part and a separating part. The ionization part mostly consists of discharge electrodes, preferably thin wires at a corresponding high voltage potential, and counter electrodes, which are generally at ground potential and thus define an electric field with the discharge electrodes, which leads to the formation of ions around the discharge electrodes.

Je nach Polarität der Entladungselektrode wird eine der beiden lonenarten von der Entladungselektrode abgestoßen und lagert sich an die in der Luft befindlichen Aerosole an, während die Luft zu dem Abscheideteil des Gerätes strömt. Der Abscheideteil des Gerätes besteht im allgemeinen aus elektrisch leitenden, parallel zueinander angeordneten Platten, die abwechselnd auf Erdpotential und auf Hochspannungspotential liegen, so daß sich zwischen ihnen ein elektrisches Feld ausbildet, in dem die geladenen Staubteilchen an die entsprechende Platte wandern und dort abgeschieden werden.Depending on the polarity of the discharge electrode, one of the two types of ions is repelled by the discharge electrode and is deposited on the aerosols in the air, while the air flows to the separating part of the device. The separating part of the device generally consists of electrically conductive plates arranged in parallel to one another, which are alternately at earth potential and at high voltage potential, so that an electrical field is formed between them, in which the charged dust particles migrate to the corresponding plate and are separated there.

Der entscheidende Nachteil der eben beschriebenen Apparatur liegt in den unterschiedlichen Spannungen, die lonisierungsteil und Abscheideteil brauchen. Eine drahtförmige Entladungselektrode braucht im allgemeinen Spannungen zwischen 12 und 15 kV, während der Abscheideteil Plattenspannungen zwischen 3 und 6 kV braucht. Zu der Abscheidespannung von 6 kV greift man nur in Kombinationen mit der 12 kV lonisierungsspannung, da dann die Herstellung zweier verschiedener Hochspannungen einfach über einen Transformator mit 6 kV Scheitelspannung und zwei Gleichrichtern, die für die Entladungselektrode in Spannungsverdoppelungsschaltung arbeiten. Die damit eingekauften Nachteile sind leider sehr groß. Abscheideplatten, die eine Spannung von 6 kV vertragen, müssen nicht nur besonders gut isoliert sein, sondern auch einen großen Abstand voneinander haben. Dies führt zu einer teuren Bauweise und einem großen Raumbedarf, da für die Abscheidung einer bestimmten Staubmenge eine entsprechende Plattenoberfläche zur Verfügung stehen muß.The decisive disadvantage of the apparatus just described lies in the different voltages that the ionizing part and the separating part need. A wire-shaped discharge electrode generally requires voltages between 12 and 15 kV, while the separating part requires plate voltages between 3 and 6 kV. The separation voltage of 6 kV is only used in combination with the 12 kV ionization voltage, since the production of two different high voltages is then simple using a transformer with a 6 kV peak voltage and two rectifiers, which work for the discharge electrode in a voltage doubling circuit. The disadvantages bought with it are unfortunately very large. Separation plates that can withstand a voltage of 6 kV not only have to be particularly well insulated, they also have to be far apart. This leads to an expensive construction and a large space requirement, since an appropriate plate surface must be available for the separation of a certain amount of dust.

So offenbart die DE-A-1 127 332 eine Anordnung, gemäß welcher eine Aufladung der Platten aus dem elektrischen Feld vorgenommen wird. Die Anordnung sieht eine Ableitung des von diesen Platten aufgenommenen Stromes über einen Widerstand gegen Erde vor. Das hat den Nachteil, daß aus dem lonisationsteil des Elektrofilters relativ hohe Ströme eingesammelt werden müssen, um einen entsprechenden Spannungsabfall am Widerstand zu erzeugen. Aus diesem Grunde müssen diese sich aufladenden Platten nahe an den lonisationsdraht gebracht werden. Bei Kurzschlüssen der Platten, die bei übergro- ßer eingesammelter Schmutzmenge vorkommen, entstehen dann Funkenstrecken zu den Entladungsdrähten, die zu einer Funktionsunfähigkeit des Filters führen. Dies gilt natürlich im besonderen Maße für die oben beschriebenen herkömmlichen Geräte.For example, DE-A-1 127 332 discloses an arrangement according to which the plates are charged from the electric field. The arrangement provides for the current drawn by these plates to be derived via a resistance to earth. This has the disadvantage that relatively high currents have to be collected from the ionization part of the electrostatic filter in order to generate a corresponding voltage drop across the resistor. For this reason, these charging plates have to be brought close to the ionization wire. If the plates are short-circuited, which occurs when the amount of dirt collected is too large, spark gaps are created to the discharge wires, which lead to the filter being unable to function. Of course, this applies in particular to the conventional devices described above.

Die erfindungsgemäße Aufgabe liegt nun vor allem darin, Elektrofilter billiger und betriebssicherer zu machen, den notwendigen Aufladestrom der Platten stark zu reduzieren, um sie einerseits von den Entladungsdrähten weiter entfernt anordnen und andererseits die Leistung der Hochspannungseinheit reduzieren zu können.The object of the invention is now primarily to make electrostatic filters cheaper and more reliable, to greatly reduce the necessary charging current of the plates, on the one hand to arrange them further away from the discharge wires and on the other hand to be able to reduce the power of the high-voltage unit.

Das wird erfindungsgemäß dadurch erreicht, daß die untere Hochspannung stehende Gattung der Abscheideplatten vollkommen isoliert und mit keinem definierten Potential leitend verbunden ist und daß jede vollkommen isolierte Abscheidungsplatte jeweils direkt gegenüber einer Entladungselektrode angeordnet ist, so daß die Hochspannung der Abscheideplatte nur durch ihre Lage und ihren Abstand zu der gegenüberliegenden Entladungselektrode des lonisationsteiles bestimmt ist.This is achieved according to the invention in that the lower high-voltage genus of the separating plates is completely insulated and is not conductively connected to any defined potential, and in that each completely insulated separating plate is arranged directly opposite a discharge electrode, so that the high voltage of the separating plate is only due to its position and its Distance to the opposite discharge electrode of the ionization part is determined.

Vorteilhafte Ausbildungen der Erfindung sind in den Unteransprüchen enthalten.Advantageous developments of the invention are contained in the subclaims.

Der Gegenstand der Erfindung ist in der Zeichnung an Hand eines Ausführungsbeispiels näher veranschaulicht. Es zeigen: Fig. 1 die geometrische Anordnung und das Schaltschema einer besonderen Ausführungsform der Erfindung und Fig. 2 eine Ausschnittsvergrößerung der in Fig. 1 gezeigten Anordnung mit angedeutetem Verlauf der Feldlinien. In Fig. 1 werden die im Schnitt gezeigten Entladungsdrähte 11 durch die Hochspannungsquelle 12 etwa auf ein Potential von 12 kV gebracht. Im Luftstrom abwärts sind geerdete Platten 13 und isoliert angebrachte, mit keinem definierten Potential elektrisch verbundene, auf Hochspannung von etwa 3 kV stehende Abscheideplatten 14 abwechselnd angeordnet.The object of the invention is illustrated in the drawing using an exemplary embodiment. 1 shows the geometrical arrangement and the circuit diagram of a special embodiment of the invention, and FIG. 2 shows an enlarged detail of the arrangement shown in FIG. 1 with the indicated course of the field lines. In Fig. 1, the discharge wires 11 shown in section are brought to a potential of about 12 kV by the high voltage source 12. Grounded plates 13 and insulated mounted separating plates 14, which are electrically connected to no defined potential and are at a high voltage of approximately 3 kV, are alternately arranged in the air flow downwards.

In Fig.2 sieht man ein Ausschnittsvergrößerung des in Fig. 1 beschriebenen Ausführungsbeispiels mit einem angedeuteten Feldlinienverlauf, aus dem die Wirkungsweise der Erfindung ersehen werden kann. Die Feldlinien verlaufen von dem Entladungsdraht 11 zu den geerdeten Abscheideplatten 13. Die isoliert angeordnete Abscheideplatte 14 wird solange mit ihrer dem Entladungsdraht 11 nächstliegenden Kante 15 Feldlinien anziehen, solange ihr Potential unter dem an der Stelle 15 herrschenden Potential ohne Abscheideplatte 14 ist. Entlang dieser Feldlinien werden auch von dem Entladungsdraht 11 ausgehende Ionen die Platte 14 treffen und solange aufladen, bis ihre Kante 15 beginnt, die von dem Entladungsdraht ausgehenden Feldlinien abzustoßen. Diese Platte 14 wird nun so lange ihr Potential halten, bis einige in Minderheit vorliegende Ionen der anderen Polarität sie so weit entladen haben, daß sie wieder gezwungen ist, sich über die dem Entladungsdraht nächstliegenden Punkte 15 wieder aufzuladen.FIG. 2 shows an enlarged detail of the exemplary embodiment described in FIG. 1 with an indicated field line course, from which the mode of operation of the invention can be seen. The field lines run from the discharge wire 11 to the grounded separating plates 13. The isolated separating plate 14 will attract 15 field lines with its edge closest to the discharging wire 11 as long as its potential is below the potential prevailing at the point 15 without a separating plate 14. Along these field lines, ions emanating from the discharge wire 11 will also hit the plate 14 and charge until their edge 15 begins to repel the field lines emanating from the discharge wire. This plate 14 will now hold its potential until some minority ions of the other polarity have discharged it so far that it is again forced to recharge via the points 15 closest to the discharge wire.

Durch diesen Regelmechanismus ist die Abscheideplatte 14 bestrebt, ihr Potential genau auf dem Wert zu halten, der an der Stelle 15 herrscht, wenn die Platte 14 entfernt ist. Damit ist die Möglichkeit gegeben, durch die Wahl des Abstandes der Platte 14 zum Draht 11 die Abscheidespannung in einem sehr großen Intervall, etwa zwischen 2 kV und 10 kV vollkommen frei einzustellen.By means of this regulating mechanism, the separating plate 14 endeavors to keep its potential exactly at the value which prevails at the point 15 when the plate 14 is removed. This makes it possible to set the separation voltage completely freely in a very large interval, for example between 2 kV and 10 kV, by selecting the distance between the plate 14 and the wire 11.

Die erfindungsgemäße Vereinfachung des elektrostatischen Luftfilters arbeitet ebenfalls zufriedenstellend, wenn es sich dabei um einen Naß-Elektrofilter handelt, bei dem die Ionen über ein elektrisch aufgeladenes Flüssigkeitsaerosol in die Luft abgegeben werden.The simplification of the electrostatic air filter according to the invention also works satisfactorily if it is a wet electrostatic precipitator in which the ions are released into the air via an electrically charged liquid aerosol.

Arbeitsspannungen für die isoliert angeordneten Abscheideplatten in der Nähe und unter 2 kV sind leichter zu erreichen, wenn als zusätzliche Stabilisierung zwischen diesen Platten und der Erdung eine Funkenstrecke eingerichtet wird. Die in dieser Erfindung vorgeschlagenen Maßnahmen arbeiten grundsätzlich auch dann, wenn eine Potentialspiegelung durchgeführt wird, das heißt, daß die Entladungselektrode sich auf Erdpotential befindet und das entsprechende elektrische Feld dadurch aufgebracht wird, daß sich nun die in die Abscheideplatten integrierten Gegenelektroden auf Hochspannungspotential befinden. Die die Entladung hervorrufende hohe Feldstärke entsteht auch in diesem Fall um die Entladungselektroden, die zu diesem Zweck eine besondere Formgebung aufweisen, wie etwa Draht, Spitze etc. Dabei ist nur zu berücksichtigen, daß die Ionen jetzt eine gegenpolige Polarität besitzen und die isoliert angebrachten Platten nicht nur nicht aufladen dürfen, sondern daß sich diese mit Hilfe der jetzt sehr seltenen gleichpoligen Ionen so aufladen müssen, daß ihr Potential in die Nähe der unter Hochspannung stehenden Abscheideplatten gelangt. Dieser Mechanismus funktioniert im Prinzip, man kann ihn jedoch durch eine Entladungsstrecke zwischen den beiden verschiedenartigen Gattungen von Abscheideplatten unterstützen.Working voltages for the isolated separator plates in the vicinity and below 2 kV are easier to achieve if a spark gap is set up as additional stabilization between these plates and the ground. The measures proposed in this invention basically also work when a potential mirroring is carried out, that is to say that the discharge electrode is at earth potential and the corresponding electric field is applied in that the counter electrodes integrated in the separating plates are now at high voltage potential. The high field strength causing the discharge also arises in this case around the discharge electrodes, which have a special shape for this purpose, such as wire, tip, etc. It only has to be taken into account that the ions now have opposite polarity and the insulated plates not only not allowed to charge, but that they have to be charged with the now very rare homopolar ions in such a way that their potential comes close to the high-voltage separating plates. This mechanism works in principle, but it can be supported by a discharge path between the two different types of separator plates.

Claims (8)

1. Electrostatic air filter with an ionization part and a separating part, made up of separating plates (14, 13) alternately at high tension and earthed, characterized by the fact that the category of separating plates (14) at high tension are completely insulated and not conductively connected with any defined potential, and that each completely insulated separating plate (14) is in each case positioned directly opposite a discharge electrode (11), so that the high tension of the separating plate (14) is determined solely by its position and distance from the opposite discharge electrode (11) of the ionization part.
2. Device in accordance with Claim 1, characterized by the fact that the ionization part produces electrically charged aerosol from an evaporating or non-evaporating liquid.
3. Device in accordance with Claim 1 or 2, characterized by the fact that the completely insulated separating plate (14) is additionally stabilized via a spark gap provided between these plates and the earth potential.
4. Device in accordance with one of Claims 1-3, characterized by the fact that the discharge electrodes 11 are at eath potential and the previously earthed separating plates 13 at high tension potential, while no change takes place in the connection system and arrangement of the separating plates (14) mounted in an insulated state.
5. Device in accordance with Claim 4, characterized by the fact that the insulated plates (14) are at a greater distance from the discharge electrode (11) than the separating plates 13 at high tension.
6. Device in accordance with Claim 4 or 5, characterized by the fact that the spark gap is provided between the separating plates (14) mounted in an insulated state and those (13) at high tension.
7. Device in accordance with Claims 1-3, characterized by the fact that liquid aerosol charged up in a unipolar manner is produced through a nozzle known per se and subject to high tension or through one or more nozzles followed by a discharge section, and is forced, by the geometry of the nozzle at high tension or the charging electrode and a suitable counterelectrode at earth potential, to move predominantly in one direction or at least in the direction of a cone with an angle of aperture less than 90°, particularly when the direction and energy of the drops of liquid, predetermined by the nozzle, is consumed, the electro-aerosol having a distance of at least 20-30 mm and a potential difference of 10-30 kV, preferably 15-25 kV, in order to be able, on the way to the counterelectrode situated »downstream«, to carry correspondingly large quantities of air with it.
8. Device in accordance with Claims 2 and 4-6, characterized by the fact that the nozzle or charging electrode is at earth potential but the counter-electrode at high tension potential.
EP19810890074 1980-05-06 1981-05-05 Electrostatic air filter Expired EP0039669B1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
AT2398/80 1980-05-06
AT239780A AT372301B (en) 1980-05-06 1980-05-06 ELECTROSTATIC AIR FILTER
AT239880 1980-05-06
AT2397/80 1980-05-06
AT3806/80 1980-07-23
AT380880 1980-07-23
AT380680 1980-07-23
AT3808/80 1980-07-23

Publications (3)

Publication Number Publication Date
EP0039669A2 EP0039669A2 (en) 1981-11-11
EP0039669A3 EP0039669A3 (en) 1983-09-14
EP0039669B1 true EP0039669B1 (en) 1985-12-27

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ID=27421762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810890074 Expired EP0039669B1 (en) 1980-05-06 1981-05-05 Electrostatic air filter

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EP (1) EP0039669B1 (en)
DE (1) DE3173286D1 (en)

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
US4516991A (en) * 1982-12-30 1985-05-14 Nihon Electric Co. Ltd. Air cleaning apparatus
DE3409999A1 (en) * 1983-03-18 1984-09-20 Ricoh Co., Ltd., Tokio/Tokyo Device for producing an ion wind
JPS6044020B2 (en) * 1983-05-13 1985-10-01 株式会社ニチエレ air flow generator
US4689056A (en) * 1983-11-23 1987-08-25 Nippon Soken, Inc. Air cleaner using ionic wind
DE19842068A1 (en) * 1998-09-15 2000-03-16 Brand Gerhart Rosemarie Air transport system for transporting air in electrostatic fields ionizes the air and moves it between two electrodes using D.C. voltage towards gas-transmissive electrode at positive voltage
AT406737B (en) * 1999-03-01 2000-08-25 Aigner Heinz ELECTRIC FILTERS, ESPECIALLY FOR EXHAUST AIR CLEANING FOR ROAD TUNNELS, UNDERGROUND GARAGES OD. DGL.
NO323806B1 (en) * 2005-11-01 2007-07-09 Roger Gale Entrance electrostatic stove precipitator
WO2009059451A1 (en) * 2007-11-05 2009-05-14 Su, Jiting An electrostatic precipitator
CN106694228B (en) * 2016-11-18 2018-11-09 江苏智石科技有限公司 A kind of air filter
CN109239052B (en) * 2018-10-29 2020-10-16 中国科学院上海技术物理研究所 Astronaut urine detection method based on liquid core waveguide Raman spectrum

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Publication number Priority date Publication date Assignee Title
DE1127332B (en) * 1955-08-30 1962-04-12 Westinghouse Electric Corp Electrostatic precipitator
GB913172A (en) * 1959-02-20 1962-12-19 Guenter Hermann Wilhelm Jucho Improvements in or relating to electrostatic filters
DE1679532B1 (en) * 1967-10-09 1970-12-10 Berckheim Graf Von Arrangement for generating unipolar air ions
FR1593800A (en) * 1968-12-29 1970-06-01
YU87570A (en) * 1970-04-02 1973-12-31 Iat Inst Aerodinamic Termodina Elektronski uredaj za visoki napon
US3704572A (en) * 1970-05-15 1972-12-05 Gourdine Systems Inc Electrostatic precipitator system
US3638058A (en) * 1970-06-08 1972-01-25 Robert S Fritzius Ion wind generator
DE2052014A1 (en) * 1970-10-23 1972-04-27 Messerschmitt Boelkow Blohm Ion thruster
FR2282670A1 (en) * 1974-08-21 1976-03-19 Equip Climatique Regulator for ionic air conditioner - has insulating sensor tube with electrodes and control circuits for generators
DE2448979A1 (en) * 1974-10-15 1976-04-29 Licentia Gmbh Electrostatic air filter with high tension ionising electrode - has high efficiency parallel collecting plates charged at comparatively low voltage
AU525784B2 (en) * 1978-03-02 1982-12-02 Pontius, D.H. Reducing back corona effects

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Publication number Publication date
EP0039669A2 (en) 1981-11-11
DE3173286D1 (en) 1986-02-06
EP0039669A3 (en) 1983-09-14

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