WO1996004975A1 - Slotted filter, in particular for hydraulic mining systems - Google Patents

Slotted filter, in particular for hydraulic mining systems Download PDF

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Publication number
WO1996004975A1
WO1996004975A1 PCT/EP1995/003120 EP9503120W WO9604975A1 WO 1996004975 A1 WO1996004975 A1 WO 1996004975A1 EP 9503120 W EP9503120 W EP 9503120W WO 9604975 A1 WO9604975 A1 WO 9604975A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
cylinder
housing
cage
axial
Prior art date
Application number
PCT/EP1995/003120
Other languages
German (de)
French (fr)
Inventor
Ernst Mateja
Original Assignee
Saarberg Hydraulik Gmbh
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 Saarberg Hydraulik Gmbh filed Critical Saarberg Hydraulik Gmbh
Priority to AU32576/95A priority Critical patent/AU3257695A/en
Publication of WO1996004975A1 publication Critical patent/WO1996004975A1/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
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • 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
    • 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
    • B01D29/46—Edge filtering elements, i.e. using contiguous impervious surfaces of flat, stacked 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
    • B01D29/88—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
    • B01D29/902—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 containing fixed liquid displacement elements or cores

Definitions

  • the invention relates to a gap filter, in particular for mining hydraulics, with a filter basket designed as a hollow cylinder in a housing having two axial connections, one of which is arranged in the continuation of the cylindrical interior of the filter basket and the other with one the filter basket surrounding space of the housing is connected.
  • Such a gap filter is known for example from DE-OS 36 43 670.
  • the filter basket consists of a tightly laid helix made of profiled wire, which is welded by welding to axially parallel rods of the same profiled wire.
  • the cross section of the profiled wire is designed so that a cylindrical surface is formed with the exception of the winding spacing and the helical gap formed by the winding spacing has sharp edges with the cylindrical surface. This is the entry side of the filter basket.
  • the dirt particles to be separated from the hydraulic fluid are retained in front of the gaps.
  • the gap width is for example 50 ⁇ , the width of the profile wires for example 2 to 3 mm.
  • the sections of the profiled wire lying between the axially parallel bars have a tendency to vibrate and flutter at high pressures, such as 300 to 000 bar, and high flow velocities. This leads to the breakage of their welds with the axial rods. After the first break occurs, the next quickly follows and then the destruction.
  • the invention has for its object to increase the life of the filter baskets. According to the invention, this purpose is achieved in that the filter basket is covered on its inlet side with a cylinder provided with passages.
  • the vibrations are also brought out of their resonance frequency and the flutter movements are damped if there is only a thin layer of liquid between the filter basket and the cylinder. In addition, dirt particles will soon be placed between them, bridging the narrow distance.
  • the cylinder is preferably arranged in the housing with a small axial play and is not gripped radially.
  • the size and distribution of the passages of the cylinder and thus also the flow rate can be optimized.
  • FIG. 3 shows a cross section along line HI-HI in FIG. 2,
  • Fig. 4 shows a cross section along line IV-IV in Fig. 2 and
  • Fig. 5 shows an axial section through a third gap filter.
  • Fig. 1 shows a housing jacket 1 with three end inserts 2, 3 and 4.
  • the seat of the inserts 2 and 3 or 4 is specified by paragraphs 5 and 6 on the inside of the housing shell 1.
  • the inserts 2 and 4, each provided with a plug-O connection 7, are screwed in, each with the interposition of a seal 8 on a further shoulder 9.
  • the insert 3 is held between the paragraph 5 and the insert 2.
  • the insert 3 forms, together with an extension 10 in the insert 2, a distributor. It projects with a flat cone 1 1 into the extension 10 and has a wreath of holes 12 on. If the flow direction is reversed, the distributor is a merger.
  • the inserts 3 and 4 each hold a filter basket 15 with a depression 13 and 14 respectively.
  • the filter wire 16 is simplified with a rectangular cross-section, the helical column 17 is shown in lines.
  • the filter wire 16 is welded on all of its turns with, for example, twelve, axially parallel rods 18.
  • a cylinder 19 in the form of a perforated tube surrounds the filter basket 1 5. It sits with axial play between the inserts 3 and 4 and is held in the radial direction only by the filter basket 15.
  • the filter basket 15 is replaced by a filter basket 20 in which the filament of the filter wire 16 is on the inside and the axially parallel rods 18 are on the outside. Instead of the cylinder 19, a cylinder 21 sits in the filter basket and occupies its inlet side.
  • FIG. 3 and 4 show the structure of the filter basket 20 and also the cylinder 21 further in detail.
  • The, here sixteen, axially parallel rods 18 have the same cross-section, flat on one side and pointed on the other side, as the filter wire 16; they consist of the same profile wire. At the contact points, the sharp edges of the rods 18 and the filter wire 16 are pressed into one another. Otherwise, welding is carried out here.
  • the extent of the holes denoted by 22 and their distance in the circumferential direction can be seen.
  • Fig. 5 corresponds to Fig. 1 with the modification that a cylinder 23 is additionally arranged in the form of a perforated tube in the filter basket 15.

Abstract

A slotted filter for hydraulic mining systems consists of a filter cage (15) designed as a hollow cylinder and mounted within a housing (1-4) with two axial connections (7) of which one is arranged in continuation to the cylindrical inner space of the filter cage (15) and the other is in communication with the space (12) of the housing that surrounds the filter cage (15). A cylinder (19) provided with openings, preferably a perforated tube, is arranged around or within the filter cage (15), at its inlet side. The cylinder (19) is arranged with little axial clearance in the housing (1-4) and is not radially secured. In known embodiments, filter cages are made of a closely wound spiral of profiled wire welded to axial parallel rods made of the same profiled wire. The profiled wire sections that lie between the axial parallel rods, and that are for example 5 to 10 mm long, tend to vibrate and to flutter at high flow rates and under high pressures of 300 to 1000 bars, for example. This causes their welds to the axial rods to break. After the first break, others follow quickly and the cage is destroyed. The cylinder mounted around or within the cage suppresses the vibrations of the profiled wire sections and thus increases the filter cage service life.

Description

Beschreibung:Description:
"Spaltfilter, insbesondere für die Hydraulik im Bergbau""Gap filter, especially for the hydraulics in mining"
Die Erfindung betrifft einen Spaltfilter, insbesondere für die Hydraulik im Bergbau, mit einem als Hohlzylinder ausgebildeten Filterkorb in einem zwei axiale Anschlüsse auf¬ weisenden Gehäuse, von denen der eine in der Fortsetzung des zylindrischen Innen¬ raumes des Filterkorbes angeordnet ist und der andere mit einem den Filterkorb umge¬ benden Raum des Gehäuses verbunden ist.The invention relates to a gap filter, in particular for mining hydraulics, with a filter basket designed as a hollow cylinder in a housing having two axial connections, one of which is arranged in the continuation of the cylindrical interior of the filter basket and the other with one the filter basket surrounding space of the housing is connected.
Ein solcher Spaltfilter ist beispielsweise aus der DE-OS 36 43 670 bekannt.Such a gap filter is known for example from DE-OS 36 43 670.
Der Filterkorb besteht aus einer eng gelegten Wendel aus Profildraht, die durch Ver¬ schweißen mit achsparallelen Stäben desselben Profildrahtes verschweißt ist. Der Querschnitt des Profildrahtes ist so gestaltet, daß eine mit Ausnahme des Windungs¬ abstandes glatte zylindrische Oberfläche entsteht und der durch den Windungsabstand gebildete wendeiförmige Spalt scharfe Kanten mit der zylindrischen Oberfläche hat. Dies ist die Eintrittsseite des Filterkorbes. Die aus der Hydraulikflüssigkeit abzuschei¬ denden Schmutzpartikel werden vor den Spalten zurückgehalten. Die Spaltbreite beträgt beispielsweise 50 μ , die Breite der Profildrähte beispielsweise 2 bis 3 mm. Die zwischen den achsparallelen Stäben liegenden, beispielsweise 5 bis 10 mm langen Abschnitte des Profildrahtes haben bei den hohen Drücken, wie 300 bis 000 bar, und hohen Strömungsgeschwindigkeiten eine Neigung, zu vibrieren und zu flattern. Das führt zum Bruch ihrer Verschweißungen mit den axialen Stäben. Nach dem Auftreten des ersten Bruches folgt schnell der nächste und dann die Zerstörung.The filter basket consists of a tightly laid helix made of profiled wire, which is welded by welding to axially parallel rods of the same profiled wire. The cross section of the profiled wire is designed so that a cylindrical surface is formed with the exception of the winding spacing and the helical gap formed by the winding spacing has sharp edges with the cylindrical surface. This is the entry side of the filter basket. The dirt particles to be separated from the hydraulic fluid are retained in front of the gaps. The gap width is for example 50 μ, the width of the profile wires for example 2 to 3 mm. The sections of the profiled wire lying between the axially parallel bars, for example 5 to 10 mm long, have a tendency to vibrate and flutter at high pressures, such as 300 to 000 bar, and high flow velocities. This leads to the breakage of their welds with the axial rods. After the first break occurs, the next quickly follows and then the destruction.
Der Erfindung liegt die Aufgabe zugrunde, die Lebensdauer der Filterkörbe zu erhöhen. Gemäß der Erfindung wird dieser Zweck dadurch erfüllt, daß der Filterkorb an seiner Eintrittsseite mit einem mit Durchlässen versehenen Zylinder belegt ist.The invention has for its object to increase the life of the filter baskets. According to the invention, this purpose is achieved in that the filter basket is covered on its inlet side with a cylinder provided with passages.
Die Belegung mit dem Zylinder, beispielsweise einem gelochten Rohr, unterbindet dasThe assignment with the cylinder, for example a perforated tube, prevents this
Schwingen der Profildrahtabschnitte.Swinging of the profile wire sections.
Dafür bedarf es nicht des unmittelbaren Anliegens des Zylinders an dem Filterkorb.This does not require the cylinder to be in direct contact with the filter basket.
Die Schwingungen werden auch aus ihrer Resonanzfrequenz gebracht und die Flatter¬ bewegungen werden gedämpft, wenn sich eine nur dünne Flüssigkeitsschicht zwischen dem Filterkorb und dem Zylinder befindet. Zudem setzen sich bald Schmutzpartikel dazwischen, die den schmalen Abstand überbrücken.The vibrations are also brought out of their resonance frequency and the flutter movements are damped if there is only a thin layer of liquid between the filter basket and the cylinder. In addition, dirt particles will soon be placed between them, bridging the narrow distance.
Vorzugsweise ist der Zylinder in dem Gehäuse mit kleinem axialen Spiel angeordnet und nicht radial gefaßt.The cylinder is preferably arranged in the housing with a small axial play and is not gripped radially.
Er hat so die Freiheit, sich ohne Zwänge mit der größtmöglichen Gleichmäßigkeit auf oder in den Korb zu setzen, je nachdem, welches die Eintrittsseite des Filterkorbes ist.This gives him the freedom to sit on or in the basket with the greatest possible uniformity, depending on which is the inlet side of the filter basket.
Größe und Verteilung der Durchlässe des Zylinders und damit auch die Strömungs¬ geschwindigkeit lassen sich optimieren.The size and distribution of the passages of the cylinder and thus also the flow rate can be optimized.
Man kann auch einen weiteren mit Durchlässen versehenen Zylinder auf der Austritts- seite des Filterkorbes anordnen, um die Strömungsgeschwindigkeit zu vermindern.It is also possible to arrange a further cylinder with passages on the outlet side of the filter basket in order to reduce the flow speed.
Die Zeichnungen geben ein Ausführungsbeispiel der Erfindung wieder.The drawings show an embodiment of the invention.
Fig. 1 zeigt einen axialen Schnitt durch einen ersten Spaltfilter,1 shows an axial section through a first gap filter,
Fig. 2 zeigt einen axialen Schnitt durch einen zweiten Spaltfilter,2 shows an axial section through a second gap filter,
Fig. 3 zeigt einen Querschnitt nach Linie HI-HI in Fig. 2,3 shows a cross section along line HI-HI in FIG. 2,
Fig. 4 zeigt einen Querschnitt nach Linie IV-IV in Fig. 2 undFig. 4 shows a cross section along line IV-IV in Fig. 2 and
Fig. 5 zeigt einen axialen Schnitt durch einen dritten Spaltfilter.Fig. 5 shows an axial section through a third gap filter.
Fig. 1 läßt einen Gehäusemantel 1 mit drei stirnseitigen Einsätzen 2, 3 und 4 erkennen. Der Sitz der Einsätze 2 und 3 bzw. 4 ist durch Absätze 5 und 6 an der Innenseite des Gehäusemantels 1 vorgegeben. Die, jeweils mit einem Steck-O-Anschluß 7 verse¬ henen, Einsätze 2 und 4 sind, jeweils unter Zwischenlegung einer Dichtung 8 an einem weiteren Absatz 9, eingeschraubt. Der Einsatz 3 ist zwischen dem Absatz 5 und dem Einsatz 2 gehalten.Fig. 1 shows a housing jacket 1 with three end inserts 2, 3 and 4. The seat of the inserts 2 and 3 or 4 is specified by paragraphs 5 and 6 on the inside of the housing shell 1. The inserts 2 and 4, each provided with a plug-O connection 7, are screwed in, each with the interposition of a seal 8 on a further shoulder 9. The insert 3 is held between the paragraph 5 and the insert 2.
Der Einsatz 3 bildet zusammen mit einer Erweiterung 10 in dem Einsatz 2 einen Vertei¬ ler. Er ragt mit einem flachen Kegel 1 1 in die Erweiterung 10 und weist einen Kranz von Bohrungen 12 auf. Bei umgekehrter Strömungsrichtung ist der Verteiler eine Zusammenführung .The insert 3 forms, together with an extension 10 in the insert 2, a distributor. It projects with a flat cone 1 1 into the extension 10 and has a wreath of holes 12 on. If the flow direction is reversed, the distributor is a merger.
Die Einsätze 3 und 4 halten jeweils mit einer Einsenkung 13 bzw. 14 einen an seinen Enden darin gefaßten Filterkorb 15. Der Filterdraht 16 ist vereinfacht mit rechteckigem Querschnitt, der wendeiförmige Spalte 17 ist in Strichen dargestellt. Der Filterdraht 16 ist auf allen seinen Windungen mit, beispielsweise zwölf, achsparallelen Stäben 18 verschweißt.The inserts 3 and 4 each hold a filter basket 15 with a depression 13 and 14 respectively. The filter wire 16 is simplified with a rectangular cross-section, the helical column 17 is shown in lines. The filter wire 16 is welded on all of its turns with, for example, twelve, axially parallel rods 18.
Ein Zylinder 19 in der Form eines gelochten Rohres umgibt den Filterkorb 1 5. Er sitzt mit axialem Spiel zwischen den Einsätzen 3 und 4 und ist in der radialen Richtung nur durch den Filterkorb 15 gehalten.A cylinder 19 in the form of a perforated tube surrounds the filter basket 1 5. It sits with axial play between the inserts 3 and 4 and is held in the radial direction only by the filter basket 15.
Die Funktion des Zylinders 19 ist oben erläutert worden.The function of the cylinder 19 has been explained above.
In Fig. 2 sind die Teile 1 bis 14 die gleichen wie in Fig. 1.In FIG. 2, parts 1 to 14 are the same as in FIG. 1.
Der Filterkorb 1 5 ist ersetzt durch einen Filterkorb 20, bei dem die Wendel des Filter¬ drahtes 16 innen liegt und die achsparallelen Stäbe 18 außen liegen. Statt des Zylin¬ ders 19 sitzt ein Zylinder 21 in dem Filterkorb und belegt dessen Eintrittsseite.The filter basket 15 is replaced by a filter basket 20 in which the filament of the filter wire 16 is on the inside and the axially parallel rods 18 are on the outside. Instead of the cylinder 19, a cylinder 21 sits in the filter basket and occupies its inlet side.
Die Strömungsrichtung ist hier umgekehrt zu Fig. 1.The direction of flow here is the reverse of FIG. 1.
Fig. 3 und 4 lassen hier den Aufbau des Filterkorbes 20 und auch des Zylinders 21 weiter im einzelnen erkennen. Die, hier sechszehn, achsparallelen Stäbe 18 haben den gleichen, auf der einen Seite ebenen und auf der anderen Seite gespitzten Querschnitt wie der Filterdraht 16; sie bestehen aus dem gleichen Profildraht. An den Berührungs¬ stellen sind die scharfen Kanten der Stäbe 18 und des Filterdrahtes 16 ineinanderge- drückt. Im übrigen ist hier jeweils eine Verschweißung vorgenommen. Bei dem Zylinder 21 sind die Erstreckung der, mit 22 bezeichneten, Löcher und ihr Abstand in Umfangs- richtung zu erkennen.3 and 4 show the structure of the filter basket 20 and also the cylinder 21 further in detail. The, here sixteen, axially parallel rods 18 have the same cross-section, flat on one side and pointed on the other side, as the filter wire 16; they consist of the same profile wire. At the contact points, the sharp edges of the rods 18 and the filter wire 16 are pressed into one another. Otherwise, welding is carried out here. In the case of the cylinder 21, the extent of the holes denoted by 22 and their distance in the circumferential direction can be seen.
Fig. 5 stimmt überein mit Fig. 1 mit der Abwandlung, daß zusätzlich in dem Filterkorb 15 ein Zylinder 23 von der Form eines gelochten Rohres angeordnet ist. Fig. 5 corresponds to Fig. 1 with the modification that a cylinder 23 is additionally arranged in the form of a perforated tube in the filter basket 15.

Claims

Patentansprüche: Claims:
1 . Spaltfilter, insbesondere für die Hydraulik im Bergbau, mit einem als Hohizylinder ausgebildeten Filterkorb (1 5;20) in einem zwei axiale Anschlüsse (7) aufweisenden Gehäuse (1-4), von denen der eine in der Fortsetzung des zylindrischen Innenrau¬ mes des Filterkorbes (15;20) angeordnet ist und der andere mit einem den Filter¬ korb (15;20) umgebenden Raum des Gehäuses verbunden (12) ist, dadurch gekennzeichnet, daß der Filterkorb (15;20) an seiner Eintrittsseite mit einem mit Durchlässen (22) versehenen Zylinder (19;21 ) belegt ist.1 . Gap filter, in particular for hydraulics in mining, with a filter basket (15; 20) designed as a hollow cylinder in a housing (1-4) having two axial connections (7), one of which is in the continuation of the cylindrical interior of the Filter basket (15; 20) is arranged and the other is connected (12) to a space of the housing surrounding the filter basket (15; 20), characterized in that the filter basket (15; 20) is provided with a passage on its inlet side (22) provided cylinder (19; 21) is occupied.
2. Spaltfilter nach Anspruch 1 , dadurch gekennzeichnet, daß der Zylinder (19;21 ) ein gelochtes Rohr ist.2. gap filter according to claim 1, characterized in that the cylinder (19; 21) is a perforated tube.
3. Spaltfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Zylinder (19;21 ) in dem Gehäuse (1-4) mit kleinem axialen Spiel angeord¬ net und nicht radial gefaßt ist.3. Gap filter according to claim 1 or 2, characterized in that the cylinder (19; 21) in the housing (1-4) angeord¬ net with a small axial play and is not taken radially.
4. Spaltfilter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Filterkorb (15;20) und der Zylinder zwischen stirnseitigen Einsätzen (3;4) eines Gehäusemantels (1 ) gehalten sind, deren Sitz in dem Gehäusemantel (1 ) durch Absätze (5;6) an dessen Innenseite vorgegeben ist.4. gap filter according to one of claims 1 to 3, characterized in that the filter basket (15; 20) and the cylinder between end inserts (3; 4) of a housing shell (1) are held, the seat in the housing shell (1) by Paragraphs (5; 6) on the inside is specified.
5. Spaltfilter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß auf der Austrittsseite des Filterkorbes ein weiterer mit Durchlässen versehener Zylinder (23) angeordnet ist. 5. A slot filter according to one of claims 1 to 4, characterized in that a further cylinder (23) provided with passages is arranged on the outlet side of the filter basket.
PCT/EP1995/003120 1994-08-11 1995-08-05 Slotted filter, in particular for hydraulic mining systems WO1996004975A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32576/95A AU3257695A (en) 1994-08-11 1995-08-05 Slotted filter, in particular for hydraulic mining systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4428468.3 1994-08-11
DE4428468A DE4428468A1 (en) 1994-08-11 1994-08-11 Gap filters, especially for mining hydraulics

Publications (1)

Publication Number Publication Date
WO1996004975A1 true WO1996004975A1 (en) 1996-02-22

Family

ID=6525459

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/003120 WO1996004975A1 (en) 1994-08-11 1995-08-05 Slotted filter, in particular for hydraulic mining systems

Country Status (3)

Country Link
AU (1) AU3257695A (en)
DE (1) DE4428468A1 (en)
WO (1) WO1996004975A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216572A (en) * 1961-11-24 1965-11-09 Bendix Corp Filter unit
DE3523218A1 (en) * 1985-06-28 1987-01-02 Reimer Michael Well filter pipe and process for the production thereof
DE3643670A1 (en) * 1986-12-20 1988-06-30 Ecker Gmbh Maschbau Disc filter, in particular for the hydraulics in mining

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216572A (en) * 1961-11-24 1965-11-09 Bendix Corp Filter unit
DE3523218A1 (en) * 1985-06-28 1987-01-02 Reimer Michael Well filter pipe and process for the production thereof
DE3643670A1 (en) * 1986-12-20 1988-06-30 Ecker Gmbh Maschbau Disc filter, in particular for the hydraulics in mining

Also Published As

Publication number Publication date
AU3257695A (en) 1996-03-07
DE4428468A1 (en) 1996-02-15

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