WO2002083314A1 - Air-cleaning filter - Google Patents
Air-cleaning filter Download PDFInfo
- Publication number
- WO2002083314A1 WO2002083314A1 PCT/SE2002/000663 SE0200663W WO02083314A1 WO 2002083314 A1 WO2002083314 A1 WO 2002083314A1 SE 0200663 W SE0200663 W SE 0200663W WO 02083314 A1 WO02083314 A1 WO 02083314A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air
- cleaning filter
- gaps
- filter according
- curve
- Prior art date
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
- B03C3/28—Plant or installations without electricity supply, e.g. using electrets
Definitions
- This invention relates to an air-cleaning filter of the type that comprises a set of soft threads of an electrostatically chargeable material and a thread-carrying body having a round basic shape, which comprises gaps, defined by curve- shaped walls, through which air may pass from outside into and through the thread set.
- An air-cleaning filter of the, . above generally mentioned kind is previously known by WO 95/33567 (priority from SE 9401950-2) .
- the thread-carrying body of this known air-cleaning filter is manufactured by a work piece consisting of two stiff, although elastically flexible bands or sheets of plastic, which initially are parallel to each other and united by a large number of spaced-apart intermediate flanges, which together with . the bands define cross-section-wise quadrangular ducts in the work piece. At the manufacture, parallel slots are cut in one of the bands, more precisely between nearby intermediate flanges, and then the other band may be bent and formed as a spiral-like coil.
- the electrostatically chargeable threads are fastened on the smooth side of the band, which is opposite the intermediate flanges.
- Characteristic of the previously known filter is that all intermediate flanges have one and the same height, something that means that the air gap between nearby walls in the spiral coil receives a uniform width all the way from the centre out towards the periphery.
- the fact that the air gap is of a uniform width along the entire extension thereof gives rise to an uneven distribution of the threads in the thread set. More precisely, the thread count in the parts of the thread set which are peripherally located becomes smaller than the thread count in the centrally located parts. This means that the particle-separating ability of the thread set decreases in the direction from the centre towards the periphery.
- a primary object of the invention is to create a filter in which the distribution of the threads in the thread set is in all essentials even along the entire cross-section area of the filter.
- An additional object is to create a filter that may be manufac- tured having a round or cylindrical basic shape in a simple, efficient and inexpensive way.
- Fig 1 is a perspective exploded view of a filter composed of a casing and a filtration unit consisting of a thread set and a carrying body
- Fig 2 is a schematic end view of the thread-carrying body according to a first embodiment of the invention
- Fig 3 is an analogue end view of a body according to an alternative, preferred embodiment of the invention.
- FIG. 1 Detailed Description of Preferred Embodiments of the Invention
- One of the components consists of a casing 1 and the other component of a filtration unit in its entirety designated 2, which in turn is composed of on one hand a form-stiff body 3, and on the other hand a thread set in which the individual threads are designated 4.
- the casing 1 as well as the filtration unit 2 is of a round or cylindrical basic shape, the shape of the filtration unit being determined, by the shape of the stiff body 3.
- gaps are included which are delimited by curve- shaped walls and through which air may pass.
- the body is shown in a horizontal plane with the threads 4 hanging down from the bottom side of the body.
- air or another gas
- the thread set positioned downstream the body.
- the body may be positioned in another way than in a horizontal plane.
- the threads 4 consist of an electrostatically chargeable material, e.g. polypropene or the like, and are soft by nature.
- the threads may be of varying lengths and be utterly fine.
- cross-section-wise rectangular threads having the size of 0,001 x 0,004 mm, are used.
- the casing 1 may advantageously - though not necessarily - be of the same length as the filtration unit 2.
- the filter according to the invention is suitable for mounting in circular air ducts or passages.
- the body 3 shown in fig 2 includes a plurality of rings 5a, 5b, 5c, 5d and 5e.
- the ring 5a defines a central hollow space 6a. Outside this hollow space, the rings define in pairs ring-shaped air gaps 6b, 6c, 6d, and 6e, respectively.
- the rings serve as. curve-shaped partition walls between the air gaps.
- the rings are circular, i.e. the individual curve shape of the wall is constituted by a circle.
- fig 2 is seen how the rings are arranged concentrically in each other.
- the rings are held together at determined distances from each other by means of spacing members 7, which in the example consist of two bars or needles 7, arranged perpendicularly to each other, which intersect the rings. In practice ⁇ other arbitrary distance members may be used for holding the rings in place in the body.
- the rings may in practice consist of thin cylinder walls of plastic having a suitable axial extension (e.g. within the range of 10-40 mm) .
- the wall thickness may advantageously be within the range of 0,5-1,5 mm.
- the threads 4 are applied on the rings and evenly distributed along the same. For instance, threads may be welded on one of the sides of the ring wall (e.g. the inside) or on both sides of the same. It should also be mentioned that the number of rings may be considerably larger than five.
- the relation between the cross-section area of the outer air gap 6e and the circumference (360°) of the ring 5e positioned outside would become proportionally larger than the relation between the cross-section area of the air gap 6d and the circumference of the ring 5d.
- the threads 4 are evenly distributed along the periphery of the rings, the same there- fore become more sparsely distributed in the outer air gaps than in the inner air gaps .
- the body according to the invention is formed in such a way that the relation between on one hand the circumference of a given wall portion having the arc length of 1 turn (360°), and on the other hand the area of a section of the air gap positioned inside said wall portion, is in all essentials constantly independent of the radial position of the wall portion in question.
- the ring 5a has the radius R.
- the ring 5b should then have the radius 1,62 R, the ring 5c the radius 2,19 R, the ring 5d the radius 2,75 R, and the ring 5e the radius 3,30 R.
- the width of the different air gaps is reduced successively in the direction from within and out towards the periphery.
- the cross-section areas of the air gaps are adapted to the circumference of the appurtenant, thread- carrying ring in such a way that the threads in the thread set are distributed in all essentials evenly in the cross-section.
- fig 3 an alternative embodiment is shown according to which the curve-shaped walls that define air gaps 6 consti- tute part of a stiff band 5 having a spiral-like shape.
- the width of the single air gap 6 may advantageously - though not necessarily - decrease continuously in the direction outwards towards the periphery of the body. This reduction of width is achieved according to the same principle as has been described above.
- the body comprises teeth or projections 9, which protrude from one side of the band 5 and serve as distance members between the different band portions in the spiral coil.
- Said teeth 9 are of different height. More precisely, the teeth located closest to the centre of the body are higher than the teeth located closest to the periphery of the body.
- the tooth height may vary continuously, i.e. so that all teeth are somewhat shorter than each tooth positioned inside counted from the centre towards the periphery. It is, however, also feasible to vary the tooth height batchwise in such a way that two or more teeth in a set closest to the centre have a maximum height, and then two or more teeth in a subsequent tooth set have a reduced height, etc.
- the partition wall formed by the helical band may be manufactured with a predetermined shape and from a material, e.g. plastic, having a certain inherent elasticity which enables an insertion of the body into the casing with a certain press fit.
Landscapes
- Filtering Materials (AREA)
- Electrostatic Separation (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- External Artificial Organs (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60235228T DE60235228D1 (en) | 2001-04-12 | 2002-04-04 | Luftreinigungsfilter |
EP02718757A EP1377382B1 (en) | 2001-04-12 | 2002-04-04 | Air-cleaning filter |
AT02718757T ATE456400T1 (en) | 2001-04-12 | 2002-04-04 | AIR PURIFICATION FILTER |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0101336-6 | 2001-04-12 | ||
SE0101336A SE518972C2 (en) | 2001-04-12 | 2001-04-12 | Air purification filter |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002083314A1 true WO2002083314A1 (en) | 2002-10-24 |
WO2002083314A9 WO2002083314A9 (en) | 2004-04-22 |
Family
ID=20283789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2002/000663 WO2002083314A1 (en) | 2001-04-12 | 2002-04-04 | Air-cleaning filter |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1377382B1 (en) |
AT (1) | ATE456400T1 (en) |
DE (1) | DE60235228D1 (en) |
SE (1) | SE518972C2 (en) |
WO (1) | WO2002083314A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007081250A1 (en) * | 2006-01-13 | 2007-07-19 | Freshman Ab | An air filter and a method for manufacturing such an air filter |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995033567A1 (en) * | 1994-06-07 | 1995-12-14 | Freshman Ab | An insert for air flow ducts |
-
2001
- 2001-04-12 SE SE0101336A patent/SE518972C2/en not_active IP Right Cessation
-
2002
- 2002-04-04 WO PCT/SE2002/000663 patent/WO2002083314A1/en not_active Application Discontinuation
- 2002-04-04 AT AT02718757T patent/ATE456400T1/en not_active IP Right Cessation
- 2002-04-04 DE DE60235228T patent/DE60235228D1/en not_active Expired - Fee Related
- 2002-04-04 EP EP02718757A patent/EP1377382B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995033567A1 (en) * | 1994-06-07 | 1995-12-14 | Freshman Ab | An insert for air flow ducts |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007081250A1 (en) * | 2006-01-13 | 2007-07-19 | Freshman Ab | An air filter and a method for manufacturing such an air filter |
Also Published As
Publication number | Publication date |
---|---|
DE60235228D1 (en) | 2010-03-18 |
EP1377382A1 (en) | 2004-01-07 |
EP1377382B1 (en) | 2010-01-27 |
SE518972C2 (en) | 2002-12-10 |
WO2002083314A9 (en) | 2004-04-22 |
SE0101336D0 (en) | 2001-04-12 |
ATE456400T1 (en) | 2010-02-15 |
SE0101336L (en) | 2002-10-13 |
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