EP4526099A1 - Ensemble filtre - Google Patents

Ensemble filtre

Info

Publication number
EP4526099A1
EP4526099A1 EP23725117.8A EP23725117A EP4526099A1 EP 4526099 A1 EP4526099 A1 EP 4526099A1 EP 23725117 A EP23725117 A EP 23725117A EP 4526099 A1 EP4526099 A1 EP 4526099A1
Authority
EP
European Patent Office
Prior art keywords
filter
openings
support wall
cleaning piston
arrangement according
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Withdrawn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
EP23725117.8A
Other languages
German (de)
English (en)
Inventor
Wilfried Leuders
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.)
Maag Automatik GmbH
Original Assignee
Maag Automatik 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 Maag Automatik GmbH filed Critical Maag Automatik GmbH
Publication of EP4526099A1 publication Critical patent/EP4526099A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
    • B29C48/6912—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a single rectilinearly reciprocating slide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/27—Cleaning; Purging; Avoiding contamination
    • B29C48/2725—Cleaning; Purging; Avoiding contamination of filters
    • B29C48/273—Cleaning; Purging; Avoiding contamination of filters using back flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/694—Cylindrical or conical filters

Definitions

  • the invention relates to a filter arrangement according to the type specified in the preamble of claim 1 and to a method for filtering fluid with a filter arrangement.
  • Such filter arrangements are used in plastics processing.
  • plastics processing plants plastic granules, regrind or powdered components are often heated into liquid plastic and then processed.
  • the plastic granulate is often made from recycled material, which often contains contamination from foreign particles.
  • Extruders for example, are used as plastics processing systems. Extruders are conveying devices that, based on the functional principle of the screw conveyor, press solid to viscous masses evenly out of a shaping opening under high pressure and high temperature, for example producing products such as flat films or blown films using an extrusion process. Other systems also use gear pumps for this purpose.
  • the heated and viscous plastic is usually mixed with dirt particles, even with pure raw materials. These dirt particles must be kept out of the plastics processing plants and out of the end product.
  • suitable filters are used that filter out these dirt particles from the liquid plastic.
  • the liquid plastic is passed through the filter arrangement under pressure before the raw material is further processed in the plastics processing plant.
  • the processing pressure must be as constant as possible.
  • the screen filters must therefore be replaced or cleaned regularly in order to ensure a uniform discharge and thus a constant processing pressure.
  • various changing devices are used for the sieves forming the filters.
  • the screen changing systems currently in use include the piston screen changers, the screen wheel filters, the belt screen changers, the rotary screen changers and the flat sliders.
  • the screen changing systems usually work automatically and are driven mechanically or hydraulically. However, manual screen changing systems are also in use.
  • a generic filter arrangement for a fluid to be filtered is known from DE 20 2017 007 054 U1.
  • the filter arrangement is provided with a filter housing which contains an inlet opening for an inlet channel and an outlet opening for an outlet channel.
  • a flow body which can be part of a piston for extending from the filter housing for a filter change of the filter arrangement, separates a first space and a second space in the filter housing from one another, together with a filter sieve and a stop wall for the filter sieve.
  • the flow body has a filter support wall with a first side and a second side located away from the first side, which rests at least partially on the filter screen with its second side and holds the filter screen on the stop wall.
  • the first room is connected to the inlet channel and the second room is connected to the outlet channel.
  • Through channels with associated openings are provided in the filter support wall on each side of the filter support wall, through which the fluid is guided from the first space via the first opening through the through channel to the second opening for filtering to the filter screen.
  • Through channels with openings on each side of the stop wall are also provided in the stop wall, through which the filtered fluid is passed from the filter screen into the second space.
  • a displaceable cleaning piston which rests on the first side of the filter support wall with a guide area.
  • the cleaning piston has at least one receiving recess arranged within the guide area, into which part of the first openings of the filter support wall extends.
  • the cleaning piston is provided with a discharge channel for discharging the backwashed fluid, so that by moving the cleaning piston along the filter support wall, deposits are removed on the filter screen and on the filter support wall by backwashing part of the filtered fluid from the second space through the stop wall, the filter screen Filter support wall is removed via the second opening, the through channel of the filter support wall, the first opening and the receiving recess of the cleaning piston into the discharge channel of the cleaning piston.
  • the cleaning piston is successively moved from a rest position outside the area with the openings of the through channels of the filter support wall into the area of the openings of the through channels of the filter support wall.
  • the cleaning piston moves over the entire area of the openings of the through channels of the filter support wall into an opposite rest position or then back into the rest position from which the cleaning piston started.
  • the invention is therefore based on the object of developing a filter arrangement according to the type specified in the preamble of claim 1 in such a way that, while avoiding the disadvantages mentioned, constant pressure conditions are created before and after the filter, with simultaneous effective backwashing, which thereby improves the quality Process and the service life of the filter arrangement increased.
  • the invention is based on the finding that by matching the receiving recess of the cleaning piston with the first openings of the filter support wall, such that the sum of the cross-sectional area of the first openings, which protrudes into the receiving recess of the cleaning piston, over the entire travel path of the cleaning piston along the filter support wall is the same, the pressure during backwashing is always independent of the travel position of the cleaning piston can be kept constant. This means that the quality of the products can at least be kept constant. In addition, the service life of the filter arrangement improves.
  • the first openings of the filter support wall and the dimensioning of the cleaning piston are coordinated with one another in such a way that the total area of the openings and areas of openings extending into the receiving recess results in a value F1, the value F1 over a travel path of the cleaning piston the area of the first openings of the through channels of the filter support wall is always the same.
  • the sum of the cross-sectional areas of the openings of the filter support wall projecting into the receiving recess of the cleaning piston is therefore always the same regardless of the travel position of the cleaning piston, so that the previously occurring pressure fluctuations when moving the cleaning piston, for example from a row of first openings in the filter support wall to the next row of first ones Openings and especially when moving from the rest position into the area of the first openings of the filter support wall can be easily avoided.
  • the cleaning piston has a first and second end position.
  • the travel path of the cleaning piston extends between the first and second end positions.
  • the value F1 always remains the same both in the two end positions and over the entire travel path.
  • the travel path of the cleaning piston relative to the filter support wall is preferably linear, in particular exclusively linear.
  • first openings in the through channels of the filter support wall can be provided in the direction of the travel path, starting from an end position of the cleaning piston.
  • the centers of a series of first openings lie in a plane perpendicular to the travel path of the cleaning piston.
  • the cross-sectional area of a row has the value F2.
  • F1 K x F2, where K > 0.
  • adjacent rows of first openings are arranged offset from one another, in particular perpendicular to an axis of the cleaning piston, for example axially offset from the longitudinal axis and/or offset at an angle from the longitudinal axis.
  • the value F2 of the sum of the cross-sectional areas of a series of first openings corresponds to the value F1.
  • each first opening and the cross-sectional area of the through channel adjoining it can each be designed the same, in particular also their outer circumferential shape.
  • each first opening and the through channel adjoining it can have a circular cross section with a diameter D and a radius R.
  • each first opening and the passage channel adjoining it can also have other cross sections, for example hexagonal or oval.
  • the distance between the receiving recess of the cleaning piston in a travel direction of the cleaning piston is so large that it is equal to or larger than the diameter D of the first opening. This allows the cleaning piston to be kept compact in a simple manner with regard to its size.
  • the filter arrangement is therefore particularly suitable for applications that have high quality requirements, preferably for integration into a film production system.
  • the cleaning piston can be adapted to the shape of the filter support wall.
  • the area of the passage body assigned to the cleaning piston and thus the cleaning piston is preferably designed to be rotationally symmetrical.
  • the filter support wall is on the Cleaning piston as well as the filter sieve and the stop wall adapted to the shape of the filter support wall. This results in a simple production of the cleaning piston and the passage body.
  • the filter support wall, the filter screen and the stop wall extend in the circumferential direction only over a partial circumference of the cleaning piston.
  • the receiving recess of the cleaning piston can include at least this partial circumference, in particular the receiving recess of the cleaning piston extends at least over this partial circumference in the circumferential direction.
  • the receiving recess of the cleaning piston is either designed as a groove with channels to the discharge channel or extends like a cylinder segment radially inwards to the discharge channel, depending on which is more favorable for the removal of the backwashed fluid in view of the specified dimensions.
  • the filter screen and the stop wall can be divided into two parts, in particular each designed as two identical components.
  • the filter support wall also has at least two areas assigned to the filter screen and the filter support wall, in which the through channels with the openings are provided.
  • At least two receiving recesses can also be provided in the cleaning piston, which are assigned to the areas with the first openings and passage channels of the filter support wall.
  • the flow body with the filter sieve and the stop wall as well as the cleaning piston arranged within the flow body can be part of a piston that can be extended from the filter housing for changing the filter sieves.
  • the individual components of the support wall and the individual components of the filter sieve are then arranged in a detachable manner in the flow body.
  • the through channels of the filter support wall, relative to a concentric axis of the cleaning piston, preferably run radially; in particular, these through channels of the filter support wall are aligned with mutually assigned through channels of the stop wall. These can then also run radially outwards.
  • a method for filtering fluid with a filter arrangement in particular according to the filter arrangement just described, is therefore provided, in which the filtered fluid is permanently backwashed in the filter arrangement.
  • the amount of backwashed fluid in the filter arrangement preferably always remains the same.
  • low-viscosity fluids preferably with a viscosity in a range from 50 Pas to 5000 Pas, are filtered.
  • the cleaning piston is permanently moved back and forth from the first end position to the second end position.
  • the cleaning piston can be moved at a speed which is in a range from 10% to 200% of the discharge speed of the filtered fluid / input speed of the fluid to be filtered, in particular in a range from 45% to 150%.
  • the amount of backwashed fluid is preferably in a range of 0.1% to 2.0% of the fluid introduced into the filter arrangement, in particular in a range of 0.5% to 1.0%.
  • the filter support wall is preferably provided with an inner sleeve and a basic filter support wall.
  • the inner sleeve includes the first and second openings and the through channels.
  • the inner sleeve is detachably connected to the basic filter support wall.
  • This allows the openings and passage channels to be optimized and adapted rheologically and flow-wise according to the viscosity of the medium to be processed.
  • the inner sleeve can be replaced in the event of wear, for example abrasive wear due to the permanent movement of the backwash piston, in order to ensure reliable filtering over a longer period of filtering.
  • the cross-sectional areas of the openings and the through channels each have a height and a width.
  • the height is many times greater than the width. This ensures that the dimensions of the cleaning piston are reduced in the longitudinal direction.
  • the cross-sectional area of the openings preferably corresponds to 65% of the cross-sectional area of the receiving recesses. This reduces the pressure on the inlet side of the filter support wall and increases the effective filter area.
  • each opening corresponds to the shape of the associated receiving recess.
  • the pressure on the inlet side of the filter support wall can thereby be reduced.
  • the flow conditions for the fluid to be filtered are optimized.
  • FIG. 1 shows a perspective view obliquely from above of a filter arrangement in the manner of a piston screen changer with extended pistons according to the invention from a first side according to a first embodiment
  • Fig. 2 is a perspective view obliquely from above of the filter arrangement of Fig. 1 from a second side;
  • Fig. 3 is a perspective view obliquely from above of the filter arrangement of Fig. 1 with the piston retracted from a first side;
  • Fig. 4 shows a first longitudinal section through the filter arrangement of Fig. 3;
  • FIG. 5 shows a second longitudinal section through the filter arrangement of FIG. 3, offset from the first longitudinal section by 90° about the longitudinal axis;
  • FIG. 6a shows a cross section through the filter arrangement in the cleaning piston with a first type of cleaning piston from FIG. 3;
  • FIG. 6b shows a cross section through the filter arrangement in the cleaning piston with a second type of cleaning piston from FIG. 3;
  • Fig. 7 is a perspective view of Fig. 1, but with stop walls arranged explosively away;
  • FIG. 8 is a perspective view of the piston of the filter assembly without a stop wall and filter screen, so that the filter support wall is visible;
  • Fig. 9 is a perspective view of a partially retracted piston of the filter arrangement of Fig. 1 from the first side after changing the screen; 10 shows a longitudinal section through the filter arrangement according to FIG. 4 with a two-part filter support wall;
  • Fig. 11 is a perspective view of the piston of the filter arrangement with the stop wall detached and slot-shaped through holes
  • Fig. 12 is a perspective view of the inner sleeve of the filter arrangement with end stop.
  • FIG. 1 to 10 show a filter arrangement 10 according to the invention with a piston screen changer.
  • 10 shows a variant and Figures 11 and 12 show a further variant of the filter arrangement 10 according to the invention.
  • the filter arrangement 10 comprises a housing 12 in which a piston 14 can be moved between a screen changing position and a filter position if necessary.
  • a filter sieve can be changed in the sieve changing position. In the filter position, a fluid can flow through the filter assembly 10 and be filtered.
  • Figures 1, 2 and 7 the piston 14 is shown in the screen changing position extended relative to the housing 12 and in Figures 3, 4, 5, 6a and 6b in the filter position retracted relative to the housing 12.
  • an inlet opening 16 is provided laterally, through which low-viscosity fluids, preferably with a viscosity in a range from 50 Pas to 5,000 Pas, for example plastic fluids, are fed to the filter arrangement 10, flow through it and are filtered in the process, as this will be explained in more detail below.
  • the fluid is supplied to the housing 12 via the inlet opening 16 via a supply line (not shown here).
  • the supply line can be screwed to the housing 12 via a flange connection.
  • the housing 12 has corresponding threaded holes 18, see for example FIG. 1 and FIG.
  • an outlet opening 20 is provided on a second side of the housing 12 remote from the first side, via which the filtered fluid is transported away from the filter arrangement 10 for further processing via a discharge line (not shown here) for further processing.
  • This discharge line can also be screwed to the housing 12 via a flange connection.
  • the housing 12 has corresponding threaded holes 22, see for example FIG. 2. In these threaded holes 22 and corresponding holes in a flange The discharge line engages screws which fasten the flange with the discharge line to the housing 12.
  • the filter arrangement 10 can be an integral part of a system for film production or granulation.
  • the filtered plastic fluid is fed via the discharge line to a nozzle for discharging the filtered plastic fluid and for transferring it into a film to be dispensed from the nozzle.
  • the drive of the piston 14 in the housing 12 for moving between the screen changing position and the filter position is basically known, so this will not be discussed further.
  • the inlet opening 16 is connected to a cylindrical interior 26 in the piston 14 via an inlet line 24 running in the housing 12 and in the piston 14.
  • the interior 26 is delimited radially outwards in the circumferential direction by inner walls 28 of the piston 14 and by two filter support walls 30 and 32 designed like cylinder segments.
  • the filter support walls 30, 32 each span an angle of approximately 120°.
  • the closed inner walls 28 of the piston 14 also run between the filter support walls 30, 32 at an angle of 120°.
  • Through holes 36 arranged radially to a longitudinal axis 34 of the piston 14 are made in each filter support wall 30, 32.
  • the through holes 36 each have the same bore cross section with a uniform diameter D and thus a uniform radius R with an inner inlet opening 36a and an outer outlet opening 36b.
  • the inlet opening 36a, the outlet opening 36b and the through hole 36 are therefore provided with the same radius.
  • Several center points of input openings 36a of the through holes 36 lie in one plane and thus form a series of input openings 36a arranged next to one another in the circumferential direction.
  • a further row of input openings 36a is provided, offset in the longitudinal direction and in the circumferential direction, the centers of which also lie in one plane. The planes of the center points of the rows run parallel to each other.
  • the through holes 36, the inlet openings 36a and the outlet openings 36b are slot-shaped in the radial direction to the longitudinal axis 34.
  • the height is many times greater than the width.
  • the cross-sectional area of the through holes 36 corresponds to 75% of the cross-sectional area of the receiving recess 68, 70 of the cleaning piston 66.
  • the shape of the through holes 36 corresponds to the shape of the receiving recess 68, 70 of the cleaning piston 66.
  • Each filter support wall 30, 32 is made in one piece with the piston 14 and is made of the same material and holds a filter screen 38, 40 that can be removed from the piston 14 (see Fig. 6a, Fig. 6b, Fig. 7) against a stop wall 42, 44 that can also be removed from the piston
  • the stop wall 42, 44 also has through holes 46 which are radially aligned with respect to the longitudinal axis 34 of the piston 14 and which are aligned with the through holes 36 of the filter support wall 30, in particular aligned with them.
  • the stop wall 42, 44 is set back from the outer peripheral surface of the piston 14 and forms an outlet space 48, 50 for the filtered fluid.
  • the stop wall 42 has this exit space 48 laterally delimiting side walls 42a, which completely laterally surrounds the surface with the through holes 46 of the stop wall 42.
  • the stop wall 44 has side walls 44a that delimit the exit space 50 and completely laterally surround the surface with the through holes 46 of the stop wall 44.
  • the side walls 42a, 44a are flush with the outer peripheral surface of the piston 14 when correctly assembled.
  • the piston 14 completely surrounds the side walls 42a, 44a laterally.
  • the stop walls 42, 44 are held in the piston 14 via a clamp connection.
  • the exit space 48, 50 is connected to a discharge line 52.
  • the side walls 42a, 44a each have semicircular depressions 42b, 44b on the outside, which are aligned with the discharge line 52, which is designed as a semicircular depression, on the outside of the piston.
  • the discharge line 52 runs from the outlet space 48, 50 first transversely to the longitudinal axis 34 of the piston 14 on its outside, then along the longitudinal axis 34 of the piston 14, finally again transversely to the longitudinal axis 34 of the piston 14, and finally goes into a tubular region of the housing 12 over and then runs to the outlet opening 20 of the filter arrangement 10.
  • the discharge line 52 is U-shaped/semicircular in cross-section and runs on the outside of the piston 14 and is supported on the side opposite the discharge line 52 by a cylindrical inside of the housing 12 limited.
  • Two opposite sides of receiving areas 14a, 14b for the stop walls 42, 44 of the piston 14 are each provided with a plate 54, which are screwed to the piston 14 by means of screws 54a.
  • the plate 54 has two grooves 54b in order to be able to better remove the stop walls 42, 44 and then the filter sieve 38, 40 from the piston 14.
  • the grooves 54b run radially relative to the longitudinal axis 34 of the piston 14 or an axis parallel to the longitudinal axis 34.
  • Seals 56 are provided at the free end of the piston 14, see FIG. 8.
  • further seals 58 are provided in the piston 14 in the longitudinal direction after the supply line 24 and the discharge line 52.
  • the flow body 14c of the piston 14 is located between the seals 56, 58.
  • the flow area of the fluid through the piston 14, i.e. through the flow body 14c, and thus through the filter arrangement 10 in the housing 12 is controlled via the seals 56, 58 Filter position sealed.
  • an end stop 60 is screwed onto the end face of the piston 14.
  • corresponding threaded holes 62 are provided in the piston 14.
  • a piston rod 64 for a cleaning piston 66 which can be moved in the interior 26 is guided over the end stop 60.
  • the cleaning piston 66 is located in the interior 26 and rests on the filter support walls 30, 32 and the inner walls 28 of the piston 14.
  • the cleaning piston 66 is cylindrical and adapted to the inner contour of the piston 14 through the filter support walls 30, 32 and inner walls 28.
  • the piston rod 64 is firmly connected to the cleaning piston 66 and extends to the side remote from the end stop 60 to a drive for the cleaning piston 66, not shown here.
  • the cleaning piston 66 is continuously moved by the drive between a first end position and moved back and forth to a second end position.
  • the end stop 60 also limits the interior 26 in a longitudinal direction.
  • the cleaning piston 66 is provided with two receiving recesses 68, 70 of the same design, which are assigned to the filter support walls 30, 32 and are arranged on the peripheral surface.
  • the receiving recess 68 is assigned to the filter supporting wall 30 and the receiving recess 70 is assigned to the filter supporting wall 32 and extends in the circumferential direction of the interior 26 in accordance with the rows of inlet openings 36a of the filter supporting walls 30.
  • the receiving recesses 68, 70 are connected to a discharge channel 72 arranged concentrically in the cleaning piston 66 Discharge of backwashed fluid connected.
  • the cleaning piston 66 is moved linearly from a starting position at the edge of the filter support walls 30, 32 to an end position at the distant edge of the filter support walls 30, 32 and back continuously using the drive, not shown here, during operation of the filter arrangement 10.
  • the direction of the process path is parallel to the longitudinal axis 34 of the piston 14.
  • the receiving recesses 68, 70 of the cleaning piston 66 extend over part of the inlet openings 36a of the filter support walls 30, 32.
  • the total area of the sum of the areas of the inlet openings 36a or the partial areas of the inlet openings 36a covered by the receiving recesses 68, 70 results in a predetermined total area with the Value Fi.
  • the value Fi always remains the same over the travel path of the cleaning piston 66 in the starting position and the end position, although the rows of inlet openings 36a and thus the partial areas of the inlet openings 36a change continuously as the cleaning piston 66 moves.
  • the receiving recess 68, 70 is at least as large in the direction of travel as the diameter D of the through holes 36 of the filter support walls 30, 32.
  • a series of inlet openings 36a can be arranged in such a way that in a travel position of the cleaning piston 66, the first edge of the receiving recesses 68, 70 of the cleaning piston 66 is aligned with the edge of the input openings 36a of a row and these openings are located completely in the receiving recesses 68, 70.
  • the second edge of the receiving recesses 68, 70 can be aligned with the edge of the entrance openings 36a of an adjacent row. Their entrance openings 36a are not located in the receiving recesses 68, 70.
  • the receiving recesses 68, 70 are each designed the same.
  • the receiving recesses 68, 70 can each be designed as a groove with channels to the discharge channel 72 or can extend radially inwards to the discharge channel 72 like a cylinder segment.
  • a mounting ring 74 is also displaceably arranged on the piston 14.
  • the mounting ring 74 has four handles 74a, 74b, 74c, 74d, with the help of which the mounting ring 74 can be moved on the piston 14.
  • the piston 14 has a length that is dimensioned such that the piston 14 protrudes from the housing 12 in the filter position, namely more than the proportion of the width of the mounting ring 74 and the end stop 60.
  • the mounting ring 74 is in the filter position arranged between the seal 56 and the end stop 60.
  • the individual filter support walls 30, 32, the filter screen 38, 40, the stop walls 42, 44 are each designed the same.
  • the mounting ring 74 is aligned so that its first stop surface 74e pointing towards the housing 12 and the second stop surface 74f pointing towards the end stop 60 are aligned plane-parallel. Correspondingly parallel to this, the surface of the housing 12 assigned to the mounting ring 74 and a surface of the end stop 60 assigned to the mounting ring 74 are formed.
  • the piston 14 moves from the filter position to the screen changing position.
  • the stop walls 42, 44 are then removed by engaging the groove 54b with an appropriate tool and lifting the stop walls 42, 44 and removing them from the piston 14.
  • the tool is then inserted into the groove 54b, the filter screens 38, 40 are lifted and removed from the piston 14.
  • the filter sieves 38, 40 are changed, ie new filter sieves 38, 40 are reinserted into the piston 14.
  • the stop walls 42, 44 are then reinserted into the piston 14 until the side walls 42a, 44a are aligned with the outer circumference of the piston 14.
  • the mounting ring 74 is gripped on at least one of the handles 74a, 74b, 74c, 74d and pushed over the stop turn 42, 44.
  • the mounting ring 74 remains in this position.
  • the piston 14 then moves from the screen changing position to the filter position.
  • the mounting ring 74 moves with its first stop surface 74e against the assigned surface of the housing 12. If necessary, the piston 14 is moved so far that the end stop 60 with its surface assigned to the dismantling ring 74 rests on the second stop surface 74f. In this way it is ensured that during the entire movement of the piston 14, the stop walls 42, 44 do not protrude beyond the outer peripheral surface of the piston.
  • the filter arrangement 10 can now filter further fluid again.
  • the invention is characterized in that a permanent backwashing of the filtered fluid in the filter arrangement 10 takes place, whereby pressure fluctuations caused by the backwashing are avoided.
  • the amount of backwashed fluid in the filter arrangement 10 always remains the same.
  • the cleaning piston 66 is constantly moved back and forth from the starting position to the second end position.
  • the cleaning piston 66 is moved at a speed which is in a range of 10% to 200% of the discharge speed of the filtered fluid/inlet speed of the fluid to be filtered, in particular in a range of 45% to 150%.
  • the amount of backwashed fluid is in a range of 0.1% to 2% of the fluid introduced into the filter arrangement 10, in particular in a range of 0.5% to 1%.
  • the filter arrangement 10 shows a variant of the embodiment according to the invention described in FIGS. 1 to 9, namely a longitudinal section of the filter arrangement 10.
  • the filter arrangement 10 has a filter support wall 76 constructed in two parts.
  • the filter support wall 76 comprises an inner sleeve 78 and a basic filter support wall 80 which receives and holds the inner sleeve.
  • the inner sleeve 78 is detachably connected to the basic filter support wall 80.
  • the inner sleeve 78 is centered when it is inserted at the front and rear ends of the interior 26 along the longitudinal axis 34. Otherwise, the filter arrangement 10 shown in FIG. 10 is constructed in the same way as explained with reference to the previous figures. Therefore, the same reference numbers are used for the same parts.
  • the through holes 36, the inlet openings 36a and the outlet openings 36b are slot-shaped in the radial direction to the longitudinal axis 34.
  • the height is many times greater than the width.
  • the cross-sectional area of the through holes 36 corresponds to 75% of the cross-sectional area of the receiving recess 68, 70 of the cleaning piston 66.
  • the shape of the through holes 36 corresponds to the shape of the receiving recess 68, 70 of the cleaning piston 66.
  • the through holes 36 are introduced into the detachably designed inner sleeve 78 . Due to the slot-shaped design of the through holes 36, the actual filter area is increased in a simple manner.
  • the present exemplary embodiments show an extendable piston 14 with a flow body 14c, filter support walls 30, 32, 76, filter screens 38, 40 and stop walls 42, 44. However, several such extendable pistons 14 are also conceivable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne un ensemble filtre (10) destiné à un fluide à filtrer, comprenant un boîtier (12) de filtre. Des premières ouvertures (36a) de canaux traversants (36) d'une paroi (30, 32) de support de filtre et les dimensions d'un piston de nettoyage (66) sont adaptées les unes aux autres de façon à ce que la surface totale de premières ouvertures (36a) s'étendant dans un évidement de réception (68, 70) et des régions de premières ouvertures (36a) s'ajoute jusqu'à atteindre une valeur F1, ladite valeur F1 étant la même sur un trajet de déplacement du piston de nettoyage (66) à travers la région des premières ouvertures (36a) des canaux traversants (36) de la paroi (30, 32) de support de filtre.
EP23725117.8A 2022-05-19 2023-05-02 Ensemble filtre Withdrawn EP4526099A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022112549.1A DE102022112549A1 (de) 2022-05-19 2022-05-19 Filteranordnung
PCT/EP2023/061568 WO2023222378A1 (fr) 2022-05-19 2023-05-02 Ensemble filtre

Publications (1)

Publication Number Publication Date
EP4526099A1 true EP4526099A1 (fr) 2025-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23725117.8A Withdrawn EP4526099A1 (fr) 2022-05-19 2023-05-02 Ensemble filtre

Country Status (7)

Country Link
EP (1) EP4526099A1 (fr)
JP (1) JP2025516833A (fr)
KR (1) KR20250012621A (fr)
CN (1) CN119233887A (fr)
DE (1) DE102022112549A1 (fr)
TW (1) TW202408646A (fr)
WO (1) WO2023222378A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024114802A1 (de) * 2024-05-27 2025-11-27 Maag Germany Gmbh Filtriervorrichtung
CN118792115B (zh) * 2024-09-13 2024-12-03 四川尚青新材料有限公司 一种植物精油萃取系统及超临界植物精华除臭剂制备工艺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007006072B4 (de) * 2007-02-02 2009-06-25 Hans-Georg Rielmann Filtereinrichtung für flüssige Medien
DE102007009419A1 (de) * 2007-02-23 2008-09-04 Rielmann, Maik Filtereinrichtung für flüssige Medien
DE202017007054U1 (de) 2017-04-05 2019-05-10 Maag Automatik Gmbh Filteranordnung für Fluid

Also Published As

Publication number Publication date
KR20250012621A (ko) 2025-01-24
TW202408646A (zh) 2024-03-01
WO2023222378A1 (fr) 2023-11-23
DE102022112549A1 (de) 2023-11-23
CN119233887A (zh) 2024-12-31
JP2025516833A (ja) 2025-05-30

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