EP0497426A1 - Dispositif de filtrage - Google Patents

Dispositif de filtrage Download PDF

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Publication number
EP0497426A1
EP0497426A1 EP92200244A EP92200244A EP0497426A1 EP 0497426 A1 EP0497426 A1 EP 0497426A1 EP 92200244 A EP92200244 A EP 92200244A EP 92200244 A EP92200244 A EP 92200244A EP 0497426 A1 EP0497426 A1 EP 0497426A1
Authority
EP
European Patent Office
Prior art keywords
filter
annular member
bag
pipe
support member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP92200244A
Other languages
German (de)
English (en)
Inventor
François Andries Van Dreumel
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.)
Dec Flexible Technologies Bv
Original Assignee
Dec Flexible Technologies Bv
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 Dec Flexible Technologies Bv filed Critical Dec Flexible Technologies Bv
Publication of EP0497426A1 publication Critical patent/EP0497426A1/fr
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters

Definitions

  • the invention relates to a device for filtering a gaseous medium flowing in a pipe.
  • the invention has for its object to provide a filtering device which can be arranged at random locations in the pipe system, can be replaced easily and is inexpensive to manufacture.
  • the invention consists of a first annular member extending along the inner wall of the pipe and a second annular member located at a distance, wherein a filter is arranged extending between both members which is formed from a strip of filter material into a bag-like body tapering in the direction of the second annular member.
  • the filter Due to the use of a foldable strip of filter material and the two annular members located at a mutual distance, the filter can be assembled manually in very simple manner and placed in the pipe. Replacing of the filter device can also be very simply carried out by hand. The filter material moreover does not have to be cleaned but can be removed as a disposable product. These operations can if necessary be included in the normal maintenance schedule of the building.
  • the second annular member is formed such that the point of the bag is held in the middle of the axis of the pipe.
  • a uniform flow through the pipe is hereby effected and, since the distance between the annular members determines the length of the filter bag filtering can take place virtually without pressure loss.
  • the filter surface area is relatively large and blockage will therefore occur only after a long time.
  • the annular means for supporting the bag-like filter can be formed in each case by a spirally wound wire. This not only results in a simple construction but the resistance for the flow of the gaseous medium is also reduced to a minimum.
  • the invention proposes to support at least the outer wall of the bag-like filter body by a support member preferably consisting of a spirally wound wire, wherein the diameter of the successive windings becomes smaller in the direction towards the second annular member.
  • first and second annular member and the support member are formed from a single wound wire.
  • the invention further relates to the strip of filter material suitable for a filtering device as described above.
  • the respective annular members 1 and 2 are wires which extend as a number of spirally tapering windings, thereby forming a support body 4 for the filter 3. At the smallest winding 4' the wire is enlarged to the diameter of the annular member 2. It is noted that the outer diameter of the annular member 1 and that of annular member 2 corresponds with the inner diameter of the pipe, which is further elucidated hereinbelow.
  • the filter body 3 can be formed from a strip of filter material as in fig. 3 which, as a result of a suitable manner of rolling up about the point A can be folded into a conical bag as according to fig. 2. This conical bag 3 can subsequently be pushed through the annular member 1 in the direction of arrow P1 into the wire windings of the support body 4 until it automatically becomes lodged.
  • a second support body 5 in the form of a spirally wound wire can be pushed into the filter bag 3 so that the latter is supported both on the outside and the inside by a reinforcing wire.
  • This embodiment is particularly useful when the filter material 3 is made of very thin material. Thin material contributes to a small fall in pressure through the filter.
  • Placing of the filter device of fig. 1 can be performed in exceptionally simple manner by inserting it into the pipe B in fig. 4 such that the first annular member points in the direction of the flow of gaseous medium, see arrow P2 in fig. 4. The filter material is thus pressed against the support member 4 by the gas flow, which is of particular importance if no inner support member 5 is arranged.
  • a separate retaining ring C, fig. 4a which is for instance clamped fixedly at the transition between two pipes between the flanges thereof. Due to the diameter decrease at this point the first annular member 1 can remain snagged therebehind, thus preventing the filter element being carried away by the gas flow.
  • the annular members forming the largest diameter of the filter can snap into pressed out ridges R, see fig. 4b.
  • the filtering device is now fixed. Replacing of the filter can be carried out in simple manner by turning the support body in the opposite direction to the winding of the wire in order to thus reduce the diameter. The filtering device can then be pulled from the pipe.
  • a T-piece is shown as connecting piece between three mutually connecting pipes B, this T-piece also being provided in its main axis with a removable wall portion D.
  • Two filtering devices can be used here in this embodiment.
  • a T-shaped connecting piece as in fig. 5b can then be used, wherein one leg is closed off by a cover E, through which the filtering device can be inserted.
  • Removal of a filter for replacing can take place in the same manner by taking out the whole, that is, filter body 3 with spiral-shaped bodies 4 and 5 and annular members 1 and 2, and immediately replacing it with an assembled filter unit as in fig. 1. It is also possible to take out only the inner support member 5, if this is present, and to replace only the filter body 3.
  • soiled filters can be treated by a company for cleaning and reconditioning the filters.
  • the filtering material can be any suitable means, wherein paper, plastic and/or textile are conceivable.
  • the first annular member 1 does not for instance have to consist of the spiral wire for the support member 4 but may be formed by a strip of plastic material bent to a ring to which the spiral 4 is adhered. The same applies to the annular member 2, wherein the distance between both members is determined subject to the use.
  • the filter material itself have to be formed from a strip as shown in fig. 3 but can also be obtained by other production methods such as injection or blow moulding or extrusion and so on.
  • the shape of the filter body 3 does not have to be precisely the conical bag formed in fig. 2 but may also have a straight generated shape varying from the cone shape. It is apparent that this shape can easily be brought about as a result of a simply realizable diameter change of the windings of the respective support members 4 and 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP92200244A 1991-01-28 1992-01-28 Dispositif de filtrage Ceased EP0497426A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9100148A NL9100148A (nl) 1991-01-28 1991-01-28 Filterinrichting.
NL9100148 1991-01-28

Publications (1)

Publication Number Publication Date
EP0497426A1 true EP0497426A1 (fr) 1992-08-05

Family

ID=19858790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200244A Ceased EP0497426A1 (fr) 1991-01-28 1992-01-28 Dispositif de filtrage

Country Status (2)

Country Link
EP (1) EP0497426A1 (fr)
NL (1) NL9100148A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2358700A (en) * 1999-11-05 2001-08-01 Conseils Etudes Et Recherches En Gestion De Lair Cerga Grille for an air inlet for ventilating a building
US6391045B1 (en) * 1993-10-01 2002-05-21 Boston Scientific Corporation Vena cava filter
DE202011100145U1 (de) * 2011-05-03 2012-08-03 Rehau Ag + Co. Luftansaugrohr für eine Belüftungsanlage eines Gebäudes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1739372A (en) * 1927-03-14 1929-12-10 Pirchio Pasquale Air filter
FR1565796A (fr) * 1967-04-18 1969-05-02
DE2017593A1 (de) * 1969-05-30 1970-12-03 Aktiebolaget Svenska Fläktfabriken, Nacka (Schweden) Taschenförmige Filteranordnung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1739372A (en) * 1927-03-14 1929-12-10 Pirchio Pasquale Air filter
FR1565796A (fr) * 1967-04-18 1969-05-02
DE2017593A1 (de) * 1969-05-30 1970-12-03 Aktiebolaget Svenska Fläktfabriken, Nacka (Schweden) Taschenförmige Filteranordnung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6391045B1 (en) * 1993-10-01 2002-05-21 Boston Scientific Corporation Vena cava filter
GB2358700A (en) * 1999-11-05 2001-08-01 Conseils Etudes Et Recherches En Gestion De Lair Cerga Grille for an air inlet for ventilating a building
GB2358700B (en) * 1999-11-05 2003-07-23 Conseils Etudes Et Recherches En Gestion De Lair Cerga Grille for an air inlet for ventilating a building
DE202011100145U1 (de) * 2011-05-03 2012-08-03 Rehau Ag + Co. Luftansaugrohr für eine Belüftungsanlage eines Gebäudes

Also Published As

Publication number Publication date
NL9100148A (nl) 1992-08-17

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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