EP0579310A1 - Elektrostatischer Filter - Google Patents

Elektrostatischer Filter Download PDF

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Publication number
EP0579310A1
EP0579310A1 EP93201913A EP93201913A EP0579310A1 EP 0579310 A1 EP0579310 A1 EP 0579310A1 EP 93201913 A EP93201913 A EP 93201913A EP 93201913 A EP93201913 A EP 93201913A EP 0579310 A1 EP0579310 A1 EP 0579310A1
Authority
EP
European Patent Office
Prior art keywords
walls
electrostatic
baffles
air
electrostatic filter
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.)
Withdrawn
Application number
EP93201913A
Other languages
English (en)
French (fr)
Inventor
Luigi Bontempi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FILIBERTI SpA
Original Assignee
FILIBERTI SpA
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 FILIBERTI SpA filed Critical FILIBERTI SpA
Publication of EP0579310A1 publication Critical patent/EP0579310A1/de
Withdrawn legal-status Critical Current

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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
    • B03C3/08—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
    • 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

  • This invention refers to a removable single-purpose single-stage electrostatic filter, particularly for equipment for air purification in enclosed spaces.
  • the electrostatic filters currently used for air purification in inhabited spaces are based on the principle of separation from the air and precipitation of particulate matter, such as dust, mist, smoke and the like, by the passage of the air through an electric field of unidirectional potential created by ionizing electrodes facing one another and of large area.
  • the air or gas passing through the strong electric field is ionized and its molecules release or acquire electrons which, on coming into contact with other molecules in the air, convert the latter into negative or positive ions which are irradiated around the polarizing electrode.
  • such ions bombard the solid particles or the droplets of mist, charging them negatively or positively and forcing them to gather on the surface of the opposite
  • Electrostatic filters based on this principle are provided in practice with two operating sections or stages, for which reason they are commonly classified as two-stage electrostatic filters.
  • the particles suspended in the air flow passing through the two sections are ionized in the first ionizing chamber and, on arriving between the plates of the collector, are repelled by the plates of like sign, thus facilitating their adherence to the plates of opposite sign.
  • the widespread use attained by two-stage electrostatic filters for ambient air purification is to a large extent due to their high efficiency in separating and disposing of the particulate matter present in the air, with the required low power consumption and with controlled operating costs.
  • one aim is to provide an electrostatic filter for air purification in general environments capable of being manufactured in a manner and with materials such as to simplify both the ionizing section and the collecting section so as to allow ease of maintenance without danger of failure or breakage of the polarizing electrodes, that is, such as to allow the use of the collecting section once only.
  • Another aim of the invention is to provide an electrostatic filter designed in such a way as to enable it to be manufactured largely using pressable material of low cost, high reliability and capable of being dimensioned to cater for any use, that is, for private, public and industrial premises alike.
  • an electrostatic filter for air-purification equipment consisting of a prismatic box-shaped body made of metallized thermoplastic material, substantially in the form of a tray, subdivided in a longitudinal sense by a multiplicity of equispaced walls perpendicular to the base alternating with dividing baffles of short length in relation to that of the walls, so as to form a multiplicity of parallel electrostatic cells within each of which is contained a fixed polarizing electrode consisting of a continuous wire, pointed band or the like of high potential, located parallel to such walls and dividing baffles and passing around the rear end of such baffles, stretched between supports integral with the air-purification device so as to make possible both the stable setting of such continuous polarizing electrodes between each pair of armatures and the removal of an individual cell for replacement when it is spent.
  • Each of such electrostatic cells is furthermore subdivided in a longitudinal sense by at least one fin of lower height than that of such walls and baffles.
  • the electrostatic filter has a flat bottom provided with a multiplicity of through holes or apertures, capable of constituting further routes for the passage of purified air for suction thereof by means of a fan or the like.
  • the electrostatic filter has supports for holding and tensioning the continuous wire which can be adjusted with respect to the plane of the supporting cover to allow the positioning of the wire at variable distances from the armatures and at variable heights inside the electrostatic cells.
  • the filtering device consists of a container body, generally marked 1, which is formed by two half-shells 1a and 1b facing one another and hinged to 2 and 2a at the opposite ends.
  • Half-shell 1a constitutes the container body proper, while half-shell 1b forms the cover capable of being opened on such hinges.
  • cover 1b are provided grille-type aperture 3 in a substantially central position, intended for the passage (according to arrow A) of the flow of air to be purified, and a series of apertures 4 at one end for the outflow (according to arrow B) of the purified air, as will become more clearly apparent later.
  • a box-shaped body substantially in the form of a tray generally marked 5 in the figures, intended to constitute the single-stage electrostatic cell, that is, a single cell capable of performing both ionization and collection of the particulate matter present in the incoming air flow and separation thereof within the said cell.
  • Such electrostatic cell 5 is dimensioned, relative to the outer container, in such a way as to create around the latter a free space 6 necessary for enabling the purified air flowing out from cell 5 to be sucked in (according to arrow C) (fig. 1) by a fan 7 and to be returned to the room via apertures 4.
  • such electrostatic cell 5 is comprised of a prismatic container body (fig. 2) of rectangular shape substantially in the form of a multi-compartment tray, made of plastic material as a single body by pressforming according to known techniques.
  • Such cell 5 is internally divided into a multiplicity of ionizing-collecting spaces by means of equispaced vertical walls, parallel to one another and arranged according to the length of the box-shaped body. More specifically, between the two outer walls 5a, 5g are arranged intermediate walls, marked 5b, 5c, 5d, 5e and 5f in fig. 2; of these, outermost walls 5a and 5g and inner walls 5c and 5e are of equal height and of length such as to be integral with rear wall 5h, while intermediate walls 5b-5d-5f are also equal in height to the previous walls, but shorter in length so as to determine a free space 8 between their ends and rear wall 5h.
  • each pair of facing walls Between each pair of facing walls are provided two walls placed together and parallel to one another, marked 9, all of them having a lower height than that of the walls between which they are contained. All the above-mentioned walls are metallized to make them conductive.
  • Each pair of facing walls 5a-5b, 5c-5d, etc. define the space within which the electric field is to be generated by means of a metal-wire polarizing electrode of known type, as will be more clearly explained later.
  • the lower pair of facing walls 9 constitute armatures the function of which is to increase the area of collection of particles within the said cell to ensure greater durability of the filter.
  • a continuous-wire polarizing electrode 11 of high potential (figs. 3 and 4) which is wound as a flat coil parallel to the bottom of the cell.
  • Such single continuous wire is inserted between the higher armatures (fig. 4), starting from a more external pair, and is then wound around the shorter adjoining armature and so on until it emerges from the last section, as shown in fig. 4.
  • Such free spaces 8 between the shorter armatures and rear wall 5h of the cell allow the return of the wire at the end of each section.
  • Wire 11 is supplied, as is known, with direct current of high potential and its stable position in the various sections is achieved by stretching the wire between two main supports 12-12a, integral with cover 1b (fig. 1), there being interposed at both ends tensioning or like springs and intermediate insulating supports (not shown), likewise integral with the cover, which support the wire on its route around the vertical walls of the sections.
  • anodic wire 11 is therefore positioned between each pair of higher armatures (fig. 4) and is furthermore adjustable for distance from lower armatures 9 so as to regulate the efficiency of separation of the particulate matter present in the air drawn in by the fan via front grille 3.
  • Cell 5 thus structured makes it possible, with a single continuous-wire polarizing electrode 11, to achieve ionization and collection of the particulate matter from all the sections of the cell whose armatures are polarized with opposite sign to that of electrode 11.
  • the bottom of cell 5 is provided with holes 13 and all the walls making up the vertical armatures have arched cuts 14 at the end turned toward fan 7. Furthermore, such single cell 5 is removably secured to outer box-shaped body 1 by means of spring-action fasteners, sliding guides or the like capable of allowing, with the cover open, that is, with the wire removed from the ionizing section, the removal of the particulate-matter collecting cell and its replacement with another, thus doing away with any cleaning or washing operating and above all avoiding any risk of damage to or irreparable failure of the wire electrode.
  • the removal of the cell may be carried out, always with the cover open, in a direction frontal to body 1 of the filter, or alternatively in an axial direction, from the part opposite the clean air outlet, even with cover 1b closed.
  • a prefilter 15 made of fabric or the like, capable of handling the larger particles which may be contained in the air to be purified.
  • the filter according to the invention achieves the predetermined aims, that is, considerable constructional simplicity, satisfactory separating efficiency with reduced loss of charge and well-controlled operating costs, plus the advantage of allowing the use of a single collecting cell which can be used only once then disposed of when fully covered and no longer able to attract particles.
  • the filter in question makes it possible to use any plastics press-forming techniques for producing the multi-section cell as a single body and to mould the individual walls constituting the armatures in the form of pyramids of elongated rectangular base which, in addition to facilitating the removal of the press-formed body, also make it possible to adjust the position of wire 11 with respect to the armatures and thus reduce electric power consumption where there is equality of section of the said wire.

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  • Electrostatic Separation (AREA)
EP93201913A 1992-07-14 1993-07-01 Elektrostatischer Filter Withdrawn EP0579310A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000703 IT226775Z2 (it) 1992-07-14 1992-07-14 Filtro elettrostatico monostadio e monouso
ITMI920703U 1992-07-14

Publications (1)

Publication Number Publication Date
EP0579310A1 true EP0579310A1 (de) 1994-01-19

Family

ID=11362602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201913A Withdrawn EP0579310A1 (de) 1992-07-14 1993-07-01 Elektrostatischer Filter

Country Status (2)

Country Link
EP (1) EP0579310A1 (de)
IT (1) IT226775Z2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2886870A1 (fr) * 2005-06-14 2006-12-15 Valeo Systemes Thermiques Dispositif de precipitation electrostatique de particules chargees et vehiculees dans un flux d'air
WO2007085430A1 (de) 2006-01-25 2007-08-02 Lufttechnik + Metallbau Ag Vorrichtung zur luftreinigung, insbesondere für lüftungs- und klimaanlagen
JP2011143376A (ja) * 2010-01-18 2011-07-28 Panasonic Corp 集塵装置
KR101988565B1 (ko) * 2018-12-31 2019-06-13 (주)코리프냉동공조 전기 접점 조립체 및 이를 구비하는 전기 집진 장치

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR37850E (fr) * 1929-12-20 1931-01-24 Cie Des Mines D Ostricourt Perfectionnements aux installations de dépoussièrage électrostatique
US3654747A (en) * 1969-12-11 1972-04-11 Electrohome Ltd Electrical precipitator
DE2658511A1 (de) * 1976-12-23 1978-07-06 Sachs Systemtechnik Gmbh Luftreinigungsgeraet
JPS62117647A (ja) * 1985-11-15 1987-05-29 Matsushita Electric Ind Co Ltd 空気清浄機
JPS62121664A (ja) * 1985-11-19 1987-06-02 Matsushita Electric Ind Co Ltd 空気清浄機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR37850E (fr) * 1929-12-20 1931-01-24 Cie Des Mines D Ostricourt Perfectionnements aux installations de dépoussièrage électrostatique
US3654747A (en) * 1969-12-11 1972-04-11 Electrohome Ltd Electrical precipitator
DE2658511A1 (de) * 1976-12-23 1978-07-06 Sachs Systemtechnik Gmbh Luftreinigungsgeraet
JPS62117647A (ja) * 1985-11-15 1987-05-29 Matsushita Electric Ind Co Ltd 空気清浄機
JPS62121664A (ja) * 1985-11-19 1987-06-02 Matsushita Electric Ind Co Ltd 空気清浄機

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 332 (C - 455)<2779> 29 November 1987 (1987-11-29) *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 349 (C - 456)<2796> 14 November 1987 (1987-11-14) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2886870A1 (fr) * 2005-06-14 2006-12-15 Valeo Systemes Thermiques Dispositif de precipitation electrostatique de particules chargees et vehiculees dans un flux d'air
WO2006134435A1 (fr) * 2005-06-14 2006-12-21 Valeo Systemes Thermiques Dispositif de precipitation electrostatique de particules chargees et vehiculees dans un flux d’air
CN101272863B (zh) * 2005-06-14 2011-04-20 法雷奥热系统公司 带入气流中的带电颗粒的静电沉积装置
WO2007085430A1 (de) 2006-01-25 2007-08-02 Lufttechnik + Metallbau Ag Vorrichtung zur luftreinigung, insbesondere für lüftungs- und klimaanlagen
US8157901B2 (en) * 2006-01-25 2012-04-17 Lufttechnik+Metallbau Ag Apparatus for purifying air, in particular for ventilation and air-conditioning systems
CN101374605B (zh) * 2006-01-25 2014-09-03 通风技术及金属结构股份公司 用于空气净化、特别是用在通风及空调设施的装置
JP2011143376A (ja) * 2010-01-18 2011-07-28 Panasonic Corp 集塵装置
KR101988565B1 (ko) * 2018-12-31 2019-06-13 (주)코리프냉동공조 전기 접점 조립체 및 이를 구비하는 전기 집진 장치

Also Published As

Publication number Publication date
ITMI920703V0 (it) 1992-07-14
ITMI920703U1 (it) 1994-01-14
IT226775Z2 (it) 1997-07-01

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