WO1989009646A1 - A method of filter-cleaning and an apparatus for carrying out the method - Google Patents

A method of filter-cleaning and an apparatus for carrying out the method Download PDF

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Publication number
WO1989009646A1
WO1989009646A1 PCT/DK1989/000081 DK8900081W WO8909646A1 WO 1989009646 A1 WO1989009646 A1 WO 1989009646A1 DK 8900081 W DK8900081 W DK 8900081W WO 8909646 A1 WO8909646 A1 WO 8909646A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter element
transducer
filter
liquid
reflushing
Prior art date
Application number
PCT/DK1989/000081
Other languages
French (fr)
Inventor
Per Resen Steenstrup
Original Assignee
Reson System Aps
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 Reson System Aps filed Critical Reson System Aps
Publication of WO1989009646A1 publication Critical patent/WO1989009646A1/en

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
    • B01D29/01—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 flat filtering elements
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • B01D29/72—Regenerating the filter material in the filter by forces created by movement of the filter element involving vibrations
    • 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
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B01D29/945—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes for continuously discharging concentrated liquid

Definitions

  • the present invention relates to a method of filter- cleaning, and a liquid-filtering apparatus where in a relatively flat and broad chamber a liquid circulating in a primary circulation flows in a so-called cross flow over a substantially plane filter element, and a fraction of the liquid amount is pressed through the filter element, whereby an ultrasonic transducer arranged with its vibration surface situated parallel to and opposite one of the surfaces of the filter element is active at least during a periodic filter-cleaning reflushing of liquid through the filter element.
  • the method and apparatus according to the invention are further developments of methods and filters used for filtration of fuel oil for motors, where the filter is cleaned periodically by establishing a pressure drop in the primary oil circulation and hence a reflux of the oil through the filter element which at the same time is exposed to ultrasound, thereby causing impurities deposited in the filter to loosen and be washed away by the oil in the primary circulation.
  • this is obtained in that the distance between the vibration surface of the ultrasound transducer and the surface of the filter element is reduced or eliminated during the reflushing when the transducer is active.
  • Figure 1 shows a simplified diagram of a part of a fuel system of a motor, wherein the liquid-filtration apparatus according to the invention can be used,
  • Figure 2 a section through an embodiment of the filter according to the invention, shown in normal position
  • FIG 3 the filter of Figure 2 shown during reflushing for cleaning of the filter element
  • Figure 4 a diagram illustrating the dependence of the cleaning effect on the distance between filter cloth and ultrasound-transducer during reflushing.
  • a pump P which draws oil from a storage tank (not shown) through a suction pipe 10 and sends it on through a heat exchanger H to a filtration apparatus F.
  • a primary circulation the greater part of the oil flows in cross flow over a filter element 7 - i.e. in a flat flow parallel to the filter cloth - and out through a primary outlet 5 and back to the pump P.
  • a small part of the oil flows through the filter element 7 to a secondary outlet 6 and further through a buffer tank B to the motor (not shown).
  • the filter element of the apparatus F is cleaned periodically by reflushing, a valve 1 at regular time intervals - or controlled by the pressure drop over the filter element - opening a pump by-pass 11 so that the pressure in the primary circulation drops, and impurities deposited in the filter loosen and are washed away by the oil in the primary circulation when the valve 1 is closed again.
  • An ultrasound-transducer (not shown in Figure 1), the vibration surface of which forms a limitation surface for the flat cross flow of oil along the filter element 7, cooperates in preventing formation of a filter pulp at the surface of the filter element 7.
  • a draining valve 2 in the primary circulation is opened, and oil is either carried back to the buffer tank or is drained out to be cleaned. Oil may also be drained out during reflushing, the valves 1 and 2 in that case being open at the same time. If the pump P draws oil (e.g. diesel oil) which is so clean that no filtration is necessary, a valve 3 in a filter by-pass pipe 8 is kept open. The filter may then be examined or replaced, it being possible to cut it off from the rest of the fuel system by means of closing valves not shown. Frequently, several filters connected in parallel are used.
  • oil e.g. diesel oil
  • a difficulty of the described method consists in that the filter element used is spoiled rather quickly which is especially presumed to be owing to cavitation formations at that side of the filter element which faces the ultrasound-transducer, and to protracted actions to loosen the impurities in the filter.
  • the filter element 7 in the housing 8 is mounted by means of guidings 9 in a way so as to be displaceable between the positions shown in Figures 2 and 3.
  • the filter is in its normal working position where - as indicated by arrows - oil in the primary circulation flows in a cross flow over the filter element 7 from the inlet 4 to the outlet 5. Also as indicated by arrows, a fraction of the oil flows through the filter element 7 to the secondary outlet 6.
  • FIG. 3 shows the filtration apparatus during cleaning of the filter element 7 by reflushing provoked by a pressure drop in the primary circulation or a pressure rise at the secondary side of the filter element 7.
  • oil now flows back through the filter element 7 from the secondary side to the primary side thereof and in a direction towards the inlets 4 and the outlets 5.
  • the filter element 7 is moved closed up to the vibration surface of the ultrasound-transducer T so that the flow velocity away from the primary side of the filter element 7 is high and, at the same time, the vibrations from the transducer T to the filter element 7 are very effective.
  • the filter element 7 stands up excellently to the strong vibration influence thereby produced, which in connection with the increased flow velocity at the primary side of the filter has the effect that it is possible to obtain an effective cleaning in a very short time.
  • the dependence of the cleaning effect on the distance between the filter element and the ultrasound-transducer is illustrated in the diagram of Figure 4 which is based on a series of experiments employing varying distance and ultrasound-effect.
  • the embodiments of the filtration apparatus according to the invention schematically shown in Figures 2 and 3 comprise a stationary ultrasound transducer T at the primary side of the filter element, it will be understood that the transducer may also be arranged at the secondary side (discharge side) of the filter.
  • the relative displacement between the filter element 7 and the transducer T may also be established by the transducer T being moved up to and away from the filter element 7 or by the transducer T as well as the filter element 7 being movable.
  • the displacement may be produced by control signals from the control circuit for the pump P or the transducer T or possibly just mechanically as a result of the pressure drop in the primary circulation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The specification describes a method and a liquid-filtration apparatus (F) where in a relatively flat and broad chamber a liquid circulating in a primary circulation flows over a plane filter element (7), and a fraction of the liquid is pressed through the filter element. Arranged opposite to the filter element (7) an ultrasound transducer (T) is working at least when the filter element is cleaned by reflushing liquid from the secondary side to the primary side. During the reflushing, the distance between the filter element (7) and the transducer (T) is reduced or eliminated. The life of the filter element (7) is thereby extended.

Description

A METHOD OF FILTER-CLEANING AND AN APPARATUS FOR CARRYING OUT THE METHOD.
The present invention relates to a method of filter- cleaning, and a liquid-filtering apparatus where in a relatively flat and broad chamber a liquid circulating in a primary circulation flows in a so-called cross flow over a substantially plane filter element, and a fraction of the liquid amount is pressed through the filter element, whereby an ultrasonic transducer arranged with its vibration surface situated parallel to and opposite one of the surfaces of the filter element is active at least during a periodic filter-cleaning reflushing of liquid through the filter element.
The method and apparatus according to the invention are further developments of methods and filters used for filtration of fuel oil for motors, where the filter is cleaned periodically by establishing a pressure drop in the primary oil circulation and hence a reflux of the oil through the filter element which at the same time is exposed to ultrasound, thereby causing impurities deposited in the filter to loosen and be washed away by the oil in the primary circulation.
However, the ultrasonic waves counter-acting the formation of a filter pulp on the surface of the filter element, i.a. owing to cavitations in the oil, have appeared to wear the filter element to such an extent that it is spoiled very quickly if the cleaning of the filter is to be fairly effective. The wear is particularly heavy during the reflushing process which requires a strong transducer to allow the impurities to be "shaken out" of the filter cloth and be carried away with the oil in the primary circulation. It is the object of the invention to indicate a method of filter-cleaning and an apparatus for carrying out the method, which make it possible to obtain a far more considerate cleaning of a filter element by reflushing than has hitherto been possible, so that the life of the filter element may be extended considerably.
According to the invention this is obtained in that the distance between the vibration surface of the ultrasound transducer and the surface of the filter element is reduced or eliminated during the reflushing when the transducer is active. By carrying the transducer and the filter element close together during the reflushing process it is obtained that during the reflushing the oil will flow away very fast from the primary side of the filter and effectively carry away impurities loosened by the transducer which is located quite close to the filter. A relatively weak ultrasound- transducer having a brief effect on the filter may be used. The life of the filter has appeared to become much longer than has hitherto been possible to obtain.
Even in cases where the ultrasound-transducer is working continuously at a maximum distance from the filter element during normal filtration (i.e. is not only activated during reflushing) this extension of lifetime may be obtained when the maximum distance and the effect of the transducer are adapted to each other with a view to sparing the filter element as much as possible.
The method may be carried out in a relatively simple liquid-filtration apparatus having a relatively flat and broad flow chamber, one side of which is formed by a substantially plane surface of a flat filter element, and an ultrasound-transducer the vibration surface of which is parallel to and arranged opposite one of the surfaces of the filter element, said apparatus being characteristic in that the ultrasound-transducer and/or the filter element are/is mounted to be displaceable in a way so that the distance between the vibration surface of the transducer and the surface of the filter element may be varied, and that control members producing the displacement are so adjusted that said distance is reduced to a minimum or zero during reflushing of liquid through the filter element in the direction towards the flow chamber at the same time while the ultrasound-transducer is working, and so that the maximum distance is reset when the reflushing ceases.
In the following the invention is described in details in connection with the drawing in which
Figure 1 shows a simplified diagram of a part of a fuel system of a motor, wherein the liquid-filtration apparatus according to the invention can be used,
Figure 2 a section through an embodiment of the filter according to the invention, shown in normal position,
Figure 3 the filter of Figure 2 shown during reflushing for cleaning of the filter element, and
Figure 4 a diagram illustrating the dependence of the cleaning effect on the distance between filter cloth and ultrasound-transducer during reflushing.
In the diagram of Figure 1 a pump P is shown, which draws oil from a storage tank (not shown) through a suction pipe 10 and sends it on through a heat exchanger H to a filtration apparatus F. In a primary circulation, the greater part of the oil flows in cross flow over a filter element 7 - i.e. in a flat flow parallel to the filter cloth - and out through a primary outlet 5 and back to the pump P. A small part of the oil flows through the filter element 7 to a secondary outlet 6 and further through a buffer tank B to the motor (not shown).
The filter element of the apparatus F is cleaned periodically by reflushing, a valve 1 at regular time intervals - or controlled by the pressure drop over the filter element - opening a pump by-pass 11 so that the pressure in the primary circulation drops, and impurities deposited in the filter loosen and are washed away by the oil in the primary circulation when the valve 1 is closed again. An ultrasound-transducer (not shown in Figure 1), the vibration surface of which forms a limitation surface for the flat cross flow of oil along the filter element 7, cooperates in preventing formation of a filter pulp at the surface of the filter element 7. When the amount of impurities in the primary circulation causes the intervals between necessary reflushings to be undesirably small, a draining valve 2 in the primary circulation is opened, and oil is either carried back to the buffer tank or is drained out to be cleaned. Oil may also be drained out during reflushing, the valves 1 and 2 in that case being open at the same time. If the pump P draws oil (e.g. diesel oil) which is so clean that no filtration is necessary, a valve 3 in a filter by-pass pipe 8 is kept open. The filter may then be examined or replaced, it being possible to cut it off from the rest of the fuel system by means of closing valves not shown. Frequently, several filters connected in parallel are used.
A difficulty of the described method consists in that the filter element used is spoiled rather quickly which is especially presumed to be owing to cavitation formations at that side of the filter element which faces the ultrasound-transducer, and to protracted actions to loosen the impurities in the filter.
It has now appeared that by means of the liquid- filtration apparatus according to the invention, e.g. the embodiment shown in Figures 2 and 3, it has become possible to obtain an effective cleaning and a considerable extension of the life of the filter element 7 thereby, that during the periodic reflushings, when the liquid pressure at the primary side of the element is lower than that at the secondary side, the distance between the surface of the filter element 7 and the ultrasound transducer T is reduced or quite eliminated while the transducer is working.
For this purpose, the filter element 7 in the housing 8 is mounted by means of guidings 9 in a way so as to be displaceable between the positions shown in Figures 2 and 3. In Figure 2 , the filter is in its normal working position where - as indicated by arrows - oil in the primary circulation flows in a cross flow over the filter element 7 from the inlet 4 to the outlet 5. Also as indicated by arrows, a fraction of the oil flows through the filter element 7 to the secondary outlet 6.
Figure 3 shows the filtration apparatus during cleaning of the filter element 7 by reflushing provoked by a pressure drop in the primary circulation or a pressure rise at the secondary side of the filter element 7. As shown by arrows, oil now flows back through the filter element 7 from the secondary side to the primary side thereof and in a direction towards the inlets 4 and the outlets 5. It will be seen that by means of the guidings 9 the filter element 7 is moved closed up to the vibration surface of the ultrasound-transducer T so that the flow velocity away from the primary side of the filter element 7 is high and, at the same time, the vibrations from the transducer T to the filter element 7 are very effective. Surprisingly it has appeared that the filter element 7 stands up excellently to the strong vibration influence thereby produced, which in connection with the increased flow velocity at the primary side of the filter has the effect that it is possible to obtain an effective cleaning in a very short time. The dependence of the cleaning effect on the distance between the filter element and the ultrasound-transducer is illustrated in the diagram of Figure 4 which is based on a series of experiments employing varying distance and ultrasound-effect. Even though the embodiments of the filtration apparatus according to the invention schematically shown in Figures 2 and 3 comprise a stationary ultrasound transducer T at the primary side of the filter element, it will be understood that the transducer may also be arranged at the secondary side (discharge side) of the filter. Further, the relative displacement between the filter element 7 and the transducer T may also be established by the transducer T being moved up to and away from the filter element 7 or by the transducer T as well as the filter element 7 being movable. The displacement may be produced by control signals from the control circuit for the pump P or the transducer T or possibly just mechanically as a result of the pressure drop in the primary circulation.

Claims

P a t e n t C l a i m s .
1. A method of filter-cleaning where in a relatively flat and broad chamber a liquid circulating in a primary circulation flows in a so-called cross flow over a substantially plane filter element, and a fraction of the liquid amount is pressed through the filter element, whereby an ultrasonic transducer arranged with its vibration surface situated parallel to and opposite one of the surfaces of the filter element is active at least during a periodic filter-cleaning reflushing of liquid through the filter element, c h a r a c t e r i z e d in that the distance between the vibration surface of the ultrasound transducer and the surface of the filter element is reduced or eliminated during the reflushing when the transducer is active.
2. A liquid-filtration apparatus comprising a relatively flat and broad flow chamber, one side of which is formed by a substantially plane surface of a flat filter element, and an ultrasound-transducer the vibration surface of which is parallel to and arranged opposite one of the surfaces of the filter element, c h a r a c t e r i z e d in that the ultrasound-transducer (T) and/or the filter element (7) are/is mounted to be displaceable in a way so that the distance between the vibration surface of the transducer (T) and the surface of the filter element (7) may be varied, and that control members producing the displacement are so adjusted that said distance is reduced to a minimum or zero during reflushing of liquid through the filter element (7) in the direction towards the flow chamber at the same time while the ultrasound-transducer (T) is working, and so that the maximum distance is reset when the reflushing ceases.
3. A liquid-filtration apparatus according to claim 2, c h a r a c t e r i z e d in that the vibration surface of the transducer (T) has an area of the same size as the surface of the filter element (7), which is situated opposite to said vibration surface.
PCT/DK1989/000081 1988-04-08 1989-04-07 A method of filter-cleaning and an apparatus for carrying out the method WO1989009646A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3811706A DE3811706A1 (en) 1988-04-08 1988-04-08 METHOD FOR CLEANING FILTERS AND APPARATUS FOR EXERCISING THE METHOD
DEP3811706.1 1988-04-08

Publications (1)

Publication Number Publication Date
WO1989009646A1 true WO1989009646A1 (en) 1989-10-19

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Country Status (4)

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AU (1) AU3444789A (en)
DE (1) DE3811706A1 (en)
ES (1) ES2012710A6 (en)
WO (1) WO1989009646A1 (en)

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AU611623B3 (en) * 1990-11-07 1991-04-30 Raymond Chen Tooth cleaner device for retention of reel means carrying a spool of strings
WO1999001199A1 (en) * 1997-07-03 1999-01-14 Sk Corporation Automatic vibration system
WO2008107652A1 (en) * 2007-03-02 2008-09-12 Smith & Nephew Plc Apparatus and method for filter cleaning by ultrasound, backwashing and filter movement during the filtration of biological samples
US7445716B2 (en) 2004-01-05 2008-11-04 Eaton Lp Crossflow pressure liquid filtration with ultrasonic enhancement
EP2607881B1 (en) * 2011-12-21 2017-02-22 Grundfos Holding A/S Concentration device
WO2019058865A1 (en) * 2017-09-25 2019-03-28 株式会社村田製作所 Filtration device
RU217432U1 (en) * 2022-11-17 2023-03-31 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский Государственный медицинский университет" Министерства здравоохранения Российской Федерации Screw extractor
US11786847B2 (en) 2017-09-19 2023-10-17 Murata Manufacturing Co., Ltd. Filtration device and filtration method

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DK162191C (en) * 1989-09-15 1992-02-17 Eskofot As FILTER FOR FILTER FILTERING
DE4118423A1 (en) * 1991-03-15 1992-09-17 Micheels Jens Dipl Ing Spray backwash filter with ultrasound vibrators - for enhanced removal of filter element retained solids in=situ in the housing
DE19844310A1 (en) * 1998-09-17 2000-03-23 Lange Gmbh Dr Bruno Water filter for removal of fine particles from laboratory samples incorporates ultrasonic emitter which provides unlimited filter service life without manual intervention
FR2822084B1 (en) 2001-03-13 2003-12-12 Sodeva LIQUID AND CONTINUOUS FILTERING DEVICE USING HIGH POWER DENSITY ULTRASOUND
ATE307653T1 (en) * 2001-05-15 2005-11-15 Koch Maschinenfabrik Ag METHOD AND DEVICE FOR FILTRATION OF FLUIDS OCCURRED IN PROCESSING MACHINES
RU2223136C1 (en) * 2003-03-06 2004-02-10 Общество с ограниченной ответственностью "Фирма ИНСТЭКО" Plant for obtaining filtered sediment from suspension, method of regeneration of surface of filter element and device for realization of this method
EP1767258A1 (en) * 2005-09-22 2007-03-28 Universiteit Twente Filter with vibrating filter element
DE102006057996B4 (en) * 2006-12-08 2011-08-25 Aquaworx Holding Ag filter module
ES2555676B1 (en) * 2014-07-01 2016-09-14 Emilio ANDRÉS VILLAS Procedure to transform used automotive filters classified as hazardous waste into urban assimilable

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GB1210942A (en) * 1967-02-24 1970-11-04 Eastman Kodak Co Ultrasonic in-line liquid filtering apparatus
EP0235436A2 (en) * 1986-02-28 1987-09-09 Kabushiki Kaisha Sanshin Seisakusho Method of filtering a suspension

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GB1210942A (en) * 1967-02-24 1970-11-04 Eastman Kodak Co Ultrasonic in-line liquid filtering apparatus
EP0235436A2 (en) * 1986-02-28 1987-09-09 Kabushiki Kaisha Sanshin Seisakusho Method of filtering a suspension

Cited By (19)

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Publication number Priority date Publication date Assignee Title
AU611623B3 (en) * 1990-11-07 1991-04-30 Raymond Chen Tooth cleaner device for retention of reel means carrying a spool of strings
WO1999001199A1 (en) * 1997-07-03 1999-01-14 Sk Corporation Automatic vibration system
US8048299B2 (en) 2004-01-05 2011-11-01 Eaton Corporation Crossflow pressure liquid filtration with ultrasonic enhancement
US7445716B2 (en) 2004-01-05 2008-11-04 Eaton Lp Crossflow pressure liquid filtration with ultrasonic enhancement
US7722767B2 (en) 2004-01-05 2010-05-25 Eaton Lp Crossflow pressure liquid filtration with ultrasonic enhancement
CN101678250B (en) * 2007-03-02 2013-04-24 史密夫及内修公开有限公司 Apparatus and method for filter cleaning by ultrasound, backwashing and filter movement during the filtration of biological samples
JP2010520446A (en) * 2007-03-02 2010-06-10 スミス アンド ネフュー ピーエルシー Filter cleaning apparatus and method with ultrasonic, backwash and filter motion during biological sample filtration
US8273253B2 (en) 2007-03-02 2012-09-25 Smith & Nephew Plc Apparatus and method for filter cleaning by ultrasound, backwashing and filter movement during the filtration of biological samples
WO2008107652A1 (en) * 2007-03-02 2008-09-12 Smith & Nephew Plc Apparatus and method for filter cleaning by ultrasound, backwashing and filter movement during the filtration of biological samples
RU2480522C2 (en) * 2007-03-02 2013-04-27 СМИТ ЭНД НЕФЬЮ ПиЭлСи Device and method to extract solid fraction from fluid medium sample
JP2013165724A (en) * 2007-03-02 2013-08-29 Smith & Nephew Plc Apparatus and method for filter cleaning by ultrasound, backwashing and filter movement during the filtration of biological samples
US8777017B2 (en) 2007-03-02 2014-07-15 Smith & Nephew, Inc. Apparatus and method for filter cleaning by ultrasound, backwashing and filter movement during the filtration of biological samples
EP2607881B1 (en) * 2011-12-21 2017-02-22 Grundfos Holding A/S Concentration device
US11786847B2 (en) 2017-09-19 2023-10-17 Murata Manufacturing Co., Ltd. Filtration device and filtration method
WO2019058865A1 (en) * 2017-09-25 2019-03-28 株式会社村田製作所 Filtration device
CN111107920A (en) * 2017-09-25 2020-05-05 株式会社村田制作所 Filter device
JPWO2019058865A1 (en) * 2017-09-25 2020-07-30 株式会社村田製作所 Filtration device
US11529579B2 (en) 2017-09-25 2022-12-20 Murata Manufacturing Co., Ltd. Filtration device
RU217432U1 (en) * 2022-11-17 2023-03-31 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский Государственный медицинский университет" Министерства здравоохранения Российской Федерации Screw extractor

Also Published As

Publication number Publication date
ES2012710A6 (en) 1990-04-01
AU3444789A (en) 1989-11-03
DE3811706A1 (en) 1989-10-19
DE3811706C2 (en) 1992-07-23

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