CH516331A - Surface action filter - cleaned by surface scouring - Google Patents

Surface action filter - cleaned by surface scouring

Info

Publication number
CH516331A
CH516331A CH1324970A CH1324970A CH516331A CH 516331 A CH516331 A CH 516331A CH 1324970 A CH1324970 A CH 1324970A CH 1324970 A CH1324970 A CH 1324970A CH 516331 A CH516331 A CH 516331A
Authority
CH
Switzerland
Prior art keywords
filter
fluid
filter element
sweeping
filtering
Prior art date
Application number
CH1324970A
Other languages
French (fr)
Inventor
Doucet Charles
Original Assignee
Doucet Charles
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 Doucet Charles filed Critical Doucet Charles
Priority to CH1324970A priority Critical patent/CH516331A/en
Priority to CH1119871A priority patent/CH532409A/en
Priority to GB3964571A priority patent/GB1351955A/en
Priority to CA121,494A priority patent/CA992002A/en
Priority to BE771870A priority patent/BE771870A/en
Priority to NL7111921A priority patent/NL7111921A/xx
Priority to US00176570A priority patent/US3794179A/en
Priority to FR7131595A priority patent/FR2107102A5/fr
Priority to DE2144264A priority patent/DE2144264C3/en
Publication of CH516331A publication Critical patent/CH516331A/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
    • B01D29/11—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
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B01D29/25—Supported filter elements arranged for outward flow filtration open-ended the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
    • 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
    • B01D29/445—Bar screens
    • 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
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • 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
    • B01D29/90—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 feeding
    • B01D29/904—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 feeding directing the mixture to be filtered on the filtering element in a manner to clean the filter continuously
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Fluid filtration, using a surface filtering element, is cleaned by flushing th filtration surface, pref. with an emulsion of the fluid with air, gas or a liquid.

Description

  

  
 



  Procédé de filtrage d'un fluide et filtre pour la mise en oeuvre de ce procédé
 Le présent brevet a pour objets un procédé de filtrage d'un fluide et un filtre pour la mise en oeuvre de ce procédé.



   D'une façon générale les filtres, et surtout les filtres à nettoyage automatique, utilisent pour se régénérer le principe du lavage par inversion de flux, ce qui fait intervenir des opérations mécaniques ou des manoeuvres de plusieurs vannes et nécessite, d'autre part, un prélèvement de l'eau filtrée pour le lavage. Dans bien des cas également une pression différentielle inverse, très supérieure à la perte de charge normale du filtre, risque de détériorer l'élément filtrant. Enfin ces filtres ont des possibilités limitées quant à la dimension des corps étrangers qu'ils peuvent recevoir.



   Le but de l'invention est de supprimer ces inconvénients et de simplifier la construction du filtre, tout en lui permettant de recevoir des corps étrangers de toutes dimensions.



   Le procédé selon l'invention se distingue par le fait qu'on utilise un élément filtrant à action superficielle, et on nettoie l'élément filtrant par balayage de la surface filtrante.



   Le filtre pour la mise en oeuvre du procédé ci-dessus se distingue par au moins un élément filtrant à action superficielle, et par des moyens pour nettoyer par balayage la surface filtrante.



   Le dessin annexé représente, à titre d'exemple, une forme d'exécution du filtre pour la mise en   oeuvre    du procédé selon l'invention.



   La fig. 1 est une coupe axiale du filtre.



   La fig. 2 est une coupe à plus grande échelle d'un détail par la ligne A-A de la fig. 1.



   Le filtre représenté comprend un corps 1 présentant une bride d'entrée 2 du fluide à filtrer, une bride de sortie 3 du fluide filtré, une bride de purge 4 et un élément filtrant 5 à l'intérieur du corps 1.



   Une vanne 9 montée sur la bride 4 ferme l'ouverture de sortie 4' du corps 1. Cette vanne 9 empêche la sortie du fluide par l'ouverture 4' et le force à passer à travers l'élément filtrant 5 pour sortir par la bride 3. De plus, la vanne 9 arrête les objets de dimensions   relative-    ment importantes et assure le balayage de la surface filtrante comme il sera décrit plus loin.



   L'élément filtrant S est cylindrique et est fixé sur la bride d'entrée 2 au moyen d'un anneau 6. Cet élément filtrant est constitué par des fils 7 s'étendant côte à côte dans le sens des génératrices du cylindre. Les fils 7 ont une section de forme générale triangulaire avec les bases en amont formant la surface filtrante et les sommets opposés à ces bases, en aval par rapport à l'écoulement comme représenté à la fig. 2. La surface filtrante peut être considérée comme étant lisse car les fentes entre les fils 7 sont de l'ordre de quelques microns seulement.



   Des anneaux de support 8 pour les fils 7 sont disposés à intervalles réguliers le long du cylindre de l'élément filtrant 5.



   Cet élément filtrant 5 est à action superficielle, c'està-dire que seules les fentes entre les bases des sections triangulaires des fils 7 servent à filtrer le fluide. En aval de chaque fente, l'espace entre les fils 7 augmente comme cela ressort de la fig. 2 et ne retient par conséquent plus rien.   I1    n'y a donc pas d'action filtrante en profondeur.



   Périodiquement ou en cas de nécessité, on nettoie l'élément filtrant 5 en ouvrant la vanne de purge 9, ce qui provoque un écoulement rapide et un balayage de la surface lisse filtrante. Cette manoeuvre peut être manuelle ou automatique.



   Pour améliorer le nettoyage de la surface filtrante on amène, selon une variante du procédé, en amont de cette surface à la partie supérieure de l'élément filtrant, de l'air, un gaz ou un liquide suivant le fluide à filtrer, de façon à obtenir une émulsion de balayage, par exemple une émulsion d'air et d'eau. Cette amenée d'air se fait  à la périphérie de l'élément filtrant et au moment du balayage. A cet effet, on utilisera de l'air comprimé, de l'air pulsé ou l'air ambiant aspiré par l'effet de giffard obtenu au moment de l'ouverture de la vanne 9. Un clapet anti-retour (non représenté) assurera dans ce cas l'automaticité de l'arrivée d'air.



   Le filtre décrit est un filtre élémentaire, c'est-à-dire avec un seul élément filtrant. On pourrait également prévoir un filtre ayant plusieurs éléments filtrants dans un même corps ou plusieurs éléments dans plusieurs corps.



   Au lieu de la vanne 9, on pourrait prévoir un autre dispositif pour fermer l'ouverture de sortie.



   Dans une autre variante du procédé, on place l'élément filtrant dans un fluide en mouvement, on dérive une partie de ce fluide à travers l'élément filtrant et on effeo tue le balayage de la surface filtrante automatiquement par le fluide principal, c'est-à-dire par le fluide qui n'a pas été dérivé.



   On peut avoir l'eau à filtrer passant de l'extérieur à l'intérieur de l'élément filtrant par exemple lorsque le filtre est placé dans un cours d'eau, la surface lisse filtrante étant alors à l'extérieur de l'élément.



   Ou bien l'eau à filtrer passe de l'intérieur vers l'extérieur de l'élément filtrant comme par exemple pour le cas d'un filtre placé dans une conduite principale de laquelle on dérive un débit partiel filtré. La surface lisse filtrante est alors à l'intérieur de l'élément.



   Dans les cas de filtration plus grossière, par exemple pour des grilles en rivières, on peut utiliser à la place des fils de section générale triangulaire des profilés en T avec les têtes contiguës de façon à former un élément filtrant cylindrique ou plan à action superficielle. Dans ce cas les barreaux sont dans le sens de balayage. 



  
 



  Method of filtering a fluid and filter for the implementation of this method
 The present patent relates to a process for filtering a fluid and a filter for implementing this process.



   In general, filters, and especially filters with automatic cleaning, use the principle of washing by reverse flow to regenerate, which involves mechanical operations or maneuvers of several valves and requires, on the other hand, a sample of filtered water for washing. In many cases, too, a reverse differential pressure, much greater than the normal pressure drop of the filter, risks damaging the filter element. Finally, these filters have limited possibilities as to the size of the foreign bodies that they can receive.



   The aim of the invention is to eliminate these drawbacks and to simplify the construction of the filter, while allowing it to receive foreign bodies of all sizes.



   The method according to the invention is distinguished by the fact that a filter element with surface action is used, and the filter element is cleaned by sweeping the filter surface.



   The filter for implementing the above method is distinguished by at least one filter element with surface action, and by means for cleaning the filter surface by sweeping.



   The appended drawing represents, by way of example, one embodiment of the filter for implementing the method according to the invention.



   Fig. 1 is an axial section of the filter.



   Fig. 2 is a section on a larger scale of a detail taken by the line A-A of FIG. 1.



   The filter shown comprises a body 1 having an inlet flange 2 for the fluid to be filtered, an outlet flange 3 for the filtered fluid, a purge flange 4 and a filter element 5 inside the body 1.



   A valve 9 mounted on the flange 4 closes the outlet opening 4 'of the body 1. This valve 9 prevents the fluid from escaping through the opening 4' and forces it to pass through the filter element 5 to exit through the flange 3. In addition, the valve 9 stops objects of relatively large dimensions and ensures the sweeping of the filtering surface as will be described later.



   The filter element S is cylindrical and is fixed to the inlet flange 2 by means of a ring 6. This filter element consists of wires 7 extending side by side in the direction of the generatrices of the cylinder. The wires 7 have a generally triangular section with the upstream bases forming the filtering surface and the tops opposite these bases, downstream with respect to the flow as shown in FIG. 2. The filtering surface can be considered to be smooth because the slits between the wires 7 are of the order of a few microns only.



   Support rings 8 for the wires 7 are arranged at regular intervals along the cylinder of the filter element 5.



   This filter element 5 has a surface action, that is to say that only the slits between the bases of the triangular sections of the wires 7 serve to filter the fluid. Downstream of each slot, the space between the son 7 increases as shown in FIG. 2 and therefore no longer retains anything. There is therefore no in-depth filtering action.



   Periodically or when necessary, the filter element 5 is cleaned by opening the purge valve 9, which causes rapid flow and sweeping of the smooth filter surface. This maneuver can be manual or automatic.



   To improve the cleaning of the filtering surface, according to a variant of the process, upstream of this surface at the upper part of the filtering element, air, a gas or a liquid are brought, depending on the fluid to be filtered, so in obtaining a sweeping emulsion, for example an emulsion of air and water. This air supply takes place at the periphery of the filter element and at the time of the sweeping. For this purpose, compressed air, pulsed air or ambient air drawn in by the giffard effect obtained when opening valve 9 will be used. A non-return valve (not shown) will ensure in this case the automaticity of the air supply.



   The filter described is an elementary filter, that is to say with a single filter element. It would also be possible to provide a filter having several filtering elements in the same body or several elements in several bodies.



   Instead of the valve 9, another device could be provided for closing the outlet opening.



   In another variant of the method, the filter element is placed in a moving fluid, part of this fluid is diverted through the filter element and the sweeping of the filter surface is automatically carried out by the main fluid, that is, that is, by the fluid which has not been derived.



   It is possible to have the water to be filtered passing from the outside to the inside of the filtering element, for example when the filter is placed in a stream, the smooth filtering surface then being outside the element. .



   Or else the water to be filtered passes from the inside to the outside of the filtering element, for example in the case of a filter placed in a main pipe from which a filtered partial flow is derived. The smooth filtering surface is then inside the element.



   In the case of coarser filtration, for example for grids in rivers, it is possible to use instead of wires of generally triangular section T-profiles with the contiguous heads so as to form a cylindrical filter element or plane with surface action. In this case the bars are in the scanning direction.

Claims (1)

REVENDICATIONS I. Procédé de filtrage d'un fluide, caractérisé en ce qu'on utilise un élément filtrant à action superficielle, et on nettoie l'élément filtrant par balayage de la surface filtrante. I. A method of filtering a fluid, characterized in that a surface-acting filter element is used, and the filter element is cleaned by sweeping the filter surface. Il. Filtre pour la mise en oeuvre du procédé selon la revendication I, caractérisé par au moins un élément filtrant à action superficielle, et par des moyens pour nettoyer par balayage la surface filtrante. He. Filter for carrying out the method according to claim I, characterized by at least one surface-acting filter element, and by means for cleaning the filter surface by sweeping. SOUS-REVENDICATIONS 1. Procédé selon la revendication I, caractérisé en ce qu'on amène en amont de la surface filtrante de l'air, un gaz ou un liquide suivant le fluide à filtrer de façon à obtenir une émulsion de balayage. SUB-CLAIMS 1. Method according to claim I, characterized in that one brings upstream of the filtering surface of the air, a gas or a liquid depending on the fluid to be filtered so as to obtain a sweeping emulsion. 2. Procédé selon la revendication I, caractérisé en ce qu'on place l'élément filtrant dans un fluide en mouvement, on dérive une partie de ce fluide à travers ledit élément, le balayage s'effectuant automatiquement par le fluide principal. 2. Method according to claim I, characterized in that the filter element is placed in a moving fluid, part of this fluid is diverted through said element, the sweeping being carried out automatically by the main fluid. 3. Filtre selon la revendication IL caractérisé en ce que l'élément filtrant est constitué par des fils disposés côte à côte de telle façon que les fentes intermédiaires permettant un écoulement laminaire s'étendent dans le sens du courant. 3. Filter according to claim IL characterized in that the filter element consists of son arranged side by side such that the intermediate slots allowing laminar flow extend in the direction of the current.
CH1324970A 1970-09-04 1970-09-04 Surface action filter - cleaned by surface scouring CH516331A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CH1324970A CH516331A (en) 1970-09-04 1970-09-04 Surface action filter - cleaned by surface scouring
CH1119871A CH532409A (en) 1970-09-04 1971-07-29 Method of filtering a fluid and filter for the implementation of this method
GB3964571A GB1351955A (en) 1970-09-04 1971-08-24 Filtration of fluids
CA121,494A CA992002A (en) 1970-09-04 1971-08-25 Filtration of fluids
BE771870A BE771870A (en) 1970-09-04 1971-08-27 FLUID AND FILTER FILTERING PROCESS FOR IMPLEMENTING THIS PROCESS.
NL7111921A NL7111921A (en) 1970-09-04 1971-08-30
US00176570A US3794179A (en) 1970-09-04 1971-08-31 Filtration of fluids
FR7131595A FR2107102A5 (en) 1970-09-04 1971-09-01
DE2144264A DE2144264C3 (en) 1970-09-04 1971-09-03 Process for filtering a liquid and filters for carrying out the process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1324970A CH516331A (en) 1970-09-04 1970-09-04 Surface action filter - cleaned by surface scouring

Publications (1)

Publication Number Publication Date
CH516331A true CH516331A (en) 1971-12-15

Family

ID=4390730

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1324970A CH516331A (en) 1970-09-04 1970-09-04 Surface action filter - cleaned by surface scouring

Country Status (1)

Country Link
CH (1) CH516331A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152895A (en) * 1989-04-25 1992-10-06 Charles Doucet Method for cleaning filter elements and filter for implementing it
US5397470A (en) * 1991-10-11 1995-03-14 Doucet; Charles Filter with cleaning by direct scavenging
WO2007130029A1 (en) 2006-05-02 2007-11-15 Birgir Nilsen Apparatus and method for separating and filtering particles and organisms from a high volume flowing liquid

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152895A (en) * 1989-04-25 1992-10-06 Charles Doucet Method for cleaning filter elements and filter for implementing it
US5397470A (en) * 1991-10-11 1995-03-14 Doucet; Charles Filter with cleaning by direct scavenging
WO2007130029A1 (en) 2006-05-02 2007-11-15 Birgir Nilsen Apparatus and method for separating and filtering particles and organisms from a high volume flowing liquid
EP2029254A1 (en) * 2006-05-02 2009-03-04 Nilsen, Birgir Apparatus and method for separating and filtering particles and organisms from a high volume flowing liquid
EP2029254A4 (en) * 2006-05-02 2010-07-07 Nilsen Birgir Apparatus and method for separating and filtering particles and organisms from a high volume flowing liquid

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