EP3609596A1 - Filtre à tamis pour microfiltration - Google Patents

Filtre à tamis pour microfiltration

Info

Publication number
EP3609596A1
EP3609596A1 EP18785115.9A EP18785115A EP3609596A1 EP 3609596 A1 EP3609596 A1 EP 3609596A1 EP 18785115 A EP18785115 A EP 18785115A EP 3609596 A1 EP3609596 A1 EP 3609596A1
Authority
EP
European Patent Office
Prior art keywords
screen filter
cylindrical body
filter
wire
screen
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Withdrawn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
EP18785115.9A
Other languages
German (de)
English (en)
Other versions
EP3609596A4 (fr
Inventor
Michael Richard EKHOLM
Steven Douglas DEHN
Charles H. Flansburg
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.)
Aqseptence Group Inc
Original Assignee
Aqseptence Group Inc
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 Aqseptence Group Inc filed Critical Aqseptence Group Inc
Publication of EP3609596A1 publication Critical patent/EP3609596A1/fr
Publication of EP3609596A4 publication Critical patent/EP3609596A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/48—Edge filtering elements, i.e. using contiguous impervious surfaces of spirally or helically wound bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/04—Supports for the filtering elements
    • B01D2201/0415—Details of supporting structures

Definitions

  • the present invention is related to wire-based screen filters for separating solid matter from fluid streams. More particularly, the present invention is directed to reusable wire-based wired screen filters that are manufactured of shaped wire so as to remove particulate matter and other contaminants having a size less than 20 microns.
  • screen filters are well known in the industry. For example, wire-based screens manufactured and sold under the Johnson Screens® mark have been used to filter incoming ground and well water over 100 years. Advantages of wire-based screen filters include their robust strength which allow them to be cleaned and reused for extended periods of time. As such, costs associated with plugging, replacement and disposal as are found with conventional bag, cartridge, ceramic, hollow fiber and membrane filters can be avoided.
  • a representative screen filter of the present invention generally comprises a plurality of support rods arranged in longitudinal relationship such that a continuous length of wire can be spirally wrapped about the support rods to define a cylindrical body.
  • slots are defined between adjacent wires wherein each slot has a slot width that determines an overall filter performance for the screen filter. Particulates larger than the slot width are retained within the slot or on an exterior surface of the cylindrical body while smaller particulates and fluid is allowed to pass through the slots and into an interior portion of the cylindrical body.
  • the screen filter is fabricated such that an average slot width across the length of the cylindrical body is equal to a filter performance rating.
  • the filter performance rating can be 20 microns such that the average slot width is also 20 microns.
  • the screen filter is fabricated such that the slot width for the cylindrical body has a normal distribution such that 99.7% of the slot widths are within three standard deviations of the average slot width and correspondingly, the filter performance rating.
  • a representative screen filter can be fabricated with shaped wire or Vee wire that is spirally wound about a plurality of longitudinally arranged support rods.
  • a representative screen filter can be fabricated to have a filter performance rating of 20 microns and a standard deviation of 8 microns for slot width such that 99.7% of all slots along a cylindrical body have a slot width of less than 44 microns.
  • Figure 1 is a perspective, end view of a screen filter according to a representative embodiment of the present invention.
  • Figure 2 is an end view of the screen filter of Figure 1.
  • Figure 3 is a section view of a screen filter according to a representative embodiment of the present invention.
  • Figure 4 is a chart illustrating slot characteristics of a screen filter of the present invention.
  • a representative screen filter 100 according to the present invention is illustrated generally in Figures 1 and 2.
  • screen filter 100 can be fabricated to assume a cylindrical body 101.
  • screen filter 100 can be fabricated so as to assume a flat screen, whereby two or more flat screens can be operably coupled to assume other geometric configurations.
  • Screen filter 100 is generally fabricated from suitable metallic materials and alloys including, for example, stainless steel, titanium and the like. Material selection can be dependent on compatibility characteristics with a fluid to be filtered or based upon other process variables.
  • Other non-metal materials including, for example, PVC, that have properties allowing for fabrication with similar geometries having the same opening sizes and precision can also be used in potential embodiments of the invention.
  • screen filter 100 generally comprises a plurality of support rods 102.
  • support rods 102 can be evenly spaced and arranged in parallel relation to a longitudinal axis 104 of the screen filter 100.
  • each support rod 102 include an interior surface 106 and an exterior surface 108 so as to define a support rod height 110 there between.
  • a continuous length of wire 110 is wound about the support rods 102 such that the wire 110 can be affixed to the exterior surface 108 at each point of contact 112.
  • the cylindrical body 101 is generally defined for the screen filter 100.
  • the wire 110 can comprise two or more lengths or spools of wire 110 that have been joined together such that the spiral winding of the wire 110 about the support rods 102 is continuous.
  • the cylindrical body 101 can be cut, sheared or otherwise reformed into a flat screen or into other alternative screen shapes.
  • screen filter 100 can include additional attachment or framing elements such as, for example, rings, fittings, bards and other like devices to assist with mounting the screen filter 100 in the desired application.
  • wire 110 preferably possesses a triangular cross-section 120 and is commonly referred to in industry as a Vee-wire. While the Vee-wire style is preferred, other conventional wire profiles known in the art can also be employed without departing from the scope of the present invention.
  • the wire 110 generally has a first vertex 122 that is affixed to the support rod 102 at the point of contact 112.
  • the first vertex 122 is operably coupled to the wire 110 using a suitable technique such as, for example, electric resistance welding.
  • a penetration depth 123 is defined in the wire 110.
  • first vertex 122 Opposite the first vertex 122 is an exposed wire surface 124 having a wire width 125 defined between a second vertex 126 and a third vertex 128.
  • the second vertex 126 and third vertex 128 each define a corner radius 130.
  • a pair of relief surfaces 132a, 132b extend between the first vertex 122 and the second and third vertexes 126, 128 respectively.
  • Relief surface 132a, 132b and the exposed wire surface 124 define a pair of relief angles 134a and 134b.
  • a wire height 136 is defined between the first vertex 122 and the exposed wire surface 124.
  • an overall screen height 138 is generally defined between the interior surface 106 and the exposed wired surface 124.
  • Screen height 138 is generally equivalent to the sum of the wire height 136 and the support rod height 100 minus the penetration depth 125. Spiral wrapping and welding of the wire 110 about the support rods 102 results in a repeating pattern of adjacent wires shown as 110a, 110b. Defined between the corner radius 130 of the adjacent wires 110a, 110b is a slot 140 having a slot width 142. In certain applications, it may be desirable to "reverse" the attachment of the wire 110 to the support rod 102 such that the exposed wire surface 124 is affixed to the support rod 102 such that the slot width 142 is defined proximate the support rod 102 and is inwardly facing toward a center of the cylindrical body 101.
  • a fluid to be filtered is introduced at an exterior to the cylindrical body configuration 114.
  • the fluid preferably passes through the slots 140, past the relief surface 132a, 132b and support rod 102 and into a screen interior 150 of the screen filter 100.
  • Particulate matter within the fluid is physically prevented from proceeding past the slots 140 and can become lodged within the slots 140 or against the exposed wire surface 124.
  • it may become necessary to backwash the screen filter 100 by introducing a fluid into the screen interior 150, whereby the fluid can flow past the support rods 102, the relief surfaces 132a, 132b and out the slots 140 to dislodge and remove the accumulated particulates.
  • the slot width 142 generally defines the filtration limits for the screen filter 100. For example, particulates having a size that exceed the slot width 142 will be physically prevented from pasting through the slots 140 and into the screen interior 150.
  • Screen filter 100 of the present invention is generally fabricated such that slot width 142 is uniform and consistently defined between each of the adjacent wires 1 10a, 1 10b along a length of the cylindrical body configuration 1 14. Screen filter 100 is fabricated such the uniformity of the slot width 142 is represented by a bell curve having a normal distribution as contained in Figure 4.
  • slot width 142 is intentionally variable, i.e. smaller or larger, at specific locations of the screen filter 100.
  • the slot width 142 can be controlled at those specified locations such that the uniformity at the specified location has a normal distribution profile.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

Un filtre à tamis ayant une pluralité de tiges de support disposées en relation longitudinale de telle sorte qu'une longueur continue de fil peut être enroulée en spirale autour des tiges de support pour définir un corps cylindrique. Le long de la longueur du corps cylindrique, des fentes sont définies entre des fils adjacents, chaque fente ayant une largeur de fente qui détermine une performance de filtre globale pour le filtre à tamis. Le filtre à tamis est fabriqué de telle sorte qu'une largeur de fente moyenne sur la longueur du corps cylindrique est égale à une évaluation de performance de filtre. Le filtre à tamis est fabriqué de telle sorte que la largeur de fente pour le corps cylindrique a une distribution normale dans laquelle 99,7 % des largeurs de fente sont à l'intérieur de trois déviations standard de la largeur de fente moyenne.
EP18785115.9A 2017-04-13 2018-04-13 Filtre à tamis pour microfiltration Withdrawn EP3609596A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762485051P 2017-04-13 2017-04-13
PCT/US2018/027478 WO2018191611A1 (fr) 2017-04-13 2018-04-13 Filtre à tamis pour microfiltration

Publications (2)

Publication Number Publication Date
EP3609596A1 true EP3609596A1 (fr) 2020-02-19
EP3609596A4 EP3609596A4 (fr) 2021-01-06

Family

ID=63793694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18785115.9A Withdrawn EP3609596A4 (fr) 2017-04-13 2018-04-13 Filtre à tamis pour microfiltration

Country Status (3)

Country Link
EP (1) EP3609596A4 (fr)
CN (1) CN110740797A (fr)
WO (1) WO2018191611A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7400963B2 (ja) * 2020-05-18 2023-12-19 株式会社村田製作所 フィルタ
US20230112945A1 (en) * 2021-10-11 2023-04-13 Mycelx Technologies Corporation Backwashable media bed filtration system and drop in retrofit kit for same
WO2024121725A1 (fr) * 2022-12-05 2024-06-13 Johnson Screens, Inc. Plaques métalliques filtrantes recouvertes de nanorevêtements multifonctionnels

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CN1006481B (zh) * 1985-11-11 1990-01-17 永罔金株式会社 同筒过滤筛
JPS62156493A (ja) * 1985-12-27 1987-07-11 永岡金網株式会社 二重筒スクリ−ン
EP0309186A1 (fr) * 1987-09-24 1989-03-29 Julian Enrique Harguindey Fibre roulé en spirale et sa méthode de fabrication
US4771829A (en) * 1987-12-30 1988-09-20 Sparlin Derry D Well liner with selective isolation screen
US5190102A (en) * 1990-10-22 1993-03-02 Otis Engineering Corporation Sintered metal substitute for prepack screen aggregate
CN2194755Y (zh) * 1994-09-07 1995-04-19 闻治思 过滤柱
US5618424A (en) * 1995-04-21 1997-04-08 Nagaoka International Corp. Rotary drum type device for separating solid particles from a liquid
JPH09155114A (ja) * 1995-12-12 1997-06-17 Motoyuki Suzukawa 流体ろ過用フィルター
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FR2810770B1 (fr) * 2000-06-23 2003-01-03 France Telecom Raffinement d'un maillage triangulaire representatif d'un objet en trois dimensions
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JP2003314184A (ja) * 2002-04-26 2003-11-06 Tadayoshi Nagaoka 長手方向スキッドロッド付円筒状井戸用スクリーン
ITVI20040139A1 (it) * 2004-06-10 2004-09-10 Comer Spa Metodo per la fabbricazione di cestelli filtranti di fibre in sospensione acquosa e cestello filtrante fabbricato mediante detto metodo
DK1728542T3 (da) * 2005-05-30 2014-07-07 Kanagawa Kiki Kogyo Co Ltd Kærvtråd-filterelement og filtreringsapparat
CN101337143A (zh) * 2007-07-11 2009-01-07 魏新时 塑料丝筛管及其加工方法
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CN102049161B (zh) * 2010-11-27 2012-11-14 辽宁裕通激光应用技术工程有限公司 V型丝工业滤网及其激光加工工艺
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CN205627261U (zh) * 2016-05-23 2016-10-12 叶礼拼 液体不锈钢滤芯

Also Published As

Publication number Publication date
CN110740797A (zh) 2020-01-31
EP3609596A4 (fr) 2021-01-06
WO2018191611A1 (fr) 2018-10-18

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