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EP4493386A1 - Dispositif de filtration pour filtrer un fluide et procédé de fonctionnement correspondant - Google Patents

Dispositif de filtration pour filtrer un fluide et procédé de fonctionnement correspondant

Info

Publication number
EP4493386A1
EP4493386A1 EP23715595.7A EP23715595A EP4493386A1 EP 4493386 A1 EP4493386 A1 EP 4493386A1 EP 23715595 A EP23715595 A EP 23715595A EP 4493386 A1 EP4493386 A1 EP 4493386A1
Authority
EP
European Patent Office
Prior art keywords
portafilter
fluid
cavity
recess
channel
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.)
Pending
Application number
EP23715595.7A
Other languages
German (de)
English (en)
Inventor
Stefan WÖSTMANN
Markus Walbersmann
Robert Middler
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.)
Nordson Corp
Original Assignee
Nordson Corp
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 Nordson Corp filed Critical Nordson Corp
Publication of EP4493386A1 publication Critical patent/EP4493386A1/fr
Pending 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
    • B29C48/693—Substantially flat filters mounted at the end of an extruder screw perpendicular to the feed axis
    • 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
    • B29C48/255—Flow control means, e.g. valves
    • B29C48/2554—Flow control means, e.g. valves provided in or in the proximity of filter devices
    • 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

Definitions

  • Filtering device for filtering a fluid and corresponding operating method
  • the invention relates to a filtering device for filtering a fluid, in particular a liquefied plastic, comprising a housing with a receptacle for receiving a portafilter, a fluid inlet channel and a fluid outlet channel, a portafilter movably accommodated within the receptacle along a longitudinal axis with a portafilter inlet, a portafilter -Outlet and a cavity for receiving a filter element, the cavity being fluidly connected to the portafilter inlet and the portafilter outlet, and wherein the portafilter can be moved from a screen changing position via a venting position area into a filtering position.
  • Filtering devices are used, for example, in plastics processing machines when high demands are placed on the purity of the plastic to be processed. They are typically positioned between an extrusion device, which melts and delivers the plastic, and an application device. Such filtering devices for filtering a fluid, in particular a liquefied plastic, and related methods are known in the prior art. For example, DE 10 2007 057 861 A1 describes such a filtering device with a portafilter in which a filter element, also referred to as a sieve, is arranged.
  • the relevant filter elements typically need to be replaced or cleaned.
  • the portafilter is moved from the filtering position, also referred to as the production position, into a so-called screen changing position, in which access to the filter element is possible and the same can be replaced.
  • the filter element After changing the filter element, it must be reinserted into the production process.
  • the challenge here is that the interior of the portafilter, known as the cavity, is filled with air after the sieve has been changed and the introduction of air into the plastic fluid flow must be avoided at all costs. For this reason, after changing the screen, the portafilter is first moved to a venting position area in which liquefied plastic flows into the screen cavity and the air contained therein is displaced to the outside via venting channels.
  • the liquefied plastic After the cavity has been completely filled or vented, the liquefied plastic must be set in motion again to start the filtration process.
  • the effect here is that the plastic melt has a certain inertia, which means that undesirable overall system pressure fluctuations can occur as part of the acceleration process of the melt. It has therefore proven to be challenging to accelerate the melt after a standstill The same must be carried out in such a way that the overall system pressure remains within narrowly definable limits.
  • the invention was based on the object of developing a device and a method of the type described at the outset in such a way that the disadvantages found in the prior art are eliminated as largely as possible.
  • the invention was based in particular on the object of specifying a device and a method in which the entire system pressure is kept largely constant during a screen changing process or a backwashing of a filter element, with the overall system complexity being reduced.
  • the object is achieved in a device of the type mentioned in that the portafilter has a throttle recess, which is arranged adjacent to the portafilter outlet and is connected to the cavity in a fluid-conducting manner, and which, depending on a position of the throttle recess relative to the fluid outlet channel, releases a variable flow cross section between the cavity and the fluid outlet channel (claim 1).
  • the invention makes use of the knowledge that by arranging a throttle recess adjacent to the portafilter outlet, a free flow cross section between the fluid outlet channel and the cavity can be adjusted particularly finely. In this way, in particular after the cavity has been completely vented, a connection between the cavity and the fluid outlet channel can be established via the throttle recess, so that a gentle acceleration of the melt, in particular from the cavity, occurs in the direction of the fluid outlet channel. In other words, in this way, the melt received in the fluid inlet channel and in the cavity can be controlled and slowly set in motion in such a way that the overall system pressure is almost not influenced by the acceleration process or is at least kept within tolerable limits.
  • the portafilter can be moved from the venting position area into the filtering position via an acceleration position area, the throttle recess releasing a variable flow cross section between the cavity and the fluid outlet channel depending on a position of the throttle recess relative to the fluid outlet channel in the acceleration position area.
  • the acceleration position area is preferably separated from the venting position area, with the acceleration of the melt therefore only taking place after it has passed through the venting position area, i.e. after the cavity has been completely vented.
  • the acceleration position range according to the invention provides for the first time a flow channel, preferably formed by a recess or groove, which contributes and serves the purpose of setting the melt in motion again after a functional interruption, in particular a screen change, i.e. accelerating the flow overall that this is preferably done carefully so that no major pressure fluctuations occur in the filtering device and preferably the system as a whole and/or major turbulence occurs and/or mixing of melt and gas occurs (also sometimes referred to as foaming).
  • a flow channel preferably formed by a recess or groove, which contributes and serves the purpose of setting the melt in motion again after a functional interruption, in particular a screen change, i.e. accelerating the flow overall that this is preferably done carefully so that no major pressure fluctuations occur in the filtering device and preferably the system as a whole and/or major turbulence occurs and/or mixing of melt and gas occurs (also sometimes referred to as foaming).
  • the invention is further developed in that the throttle recess extends along the longitudinal axis starting from the portafilter outlet and from the screen changing position considered, extends in the direction of the fluid outlet channel.
  • the variable flow cross section between the cavity and the fluid outlet channel is released or adjusted by moving the throttle recess in the direction of the fluid outlet channel by moving the portafilter.
  • the flow cross section between the cavity and the fluid outlet channel can be influenced as desired by changing the position of the portafilter along the longitudinal axis.
  • the throttle recess has a cross section that changes in the direction of the longitudinal axis.
  • the cross section of the throttle recess tapers starting from the portafilter outlet in the direction of the longitudinal axis. In this way, moving the portafilter and thus moving the throttle recess in the direction of the fluid outlet channel results in initially only a very small flow cross section being released between the cavity and the fluid outlet channel and as the portafilter is pushed further forward, the flow cross section increases disproportionately.
  • the system pressure as stated, can be advantageously influenced and, on the other hand, the melt can be advantageously accelerated.
  • the cross section of the throttle recess tapers linearly starting from the portafilter outlet in the direction of the longitudinal axis.
  • the cross section has a wedge-shaped or notch-shaped basic shape. This achieves a particularly sensitive adjustment of the flow cross section.
  • the fluid inlet channel and the fluid outlet channel are arranged in the housing in such a way that when the portafilter is moved from the screen changing position via the venting position area and the acceleration position area in the direction of the filtering position, the cavity in the venting position area is initially, in particular exclusively, connected in a fluid-conducting manner to the fluid inlet channel and when the portafilter is moved further in the direction of the filtering position, the cavity in the acceleration position area is additionally connected to the fluid outlet channel via the throttle recess in a fluid-conducting manner. In this way, the cavity is filled in a particularly gentle manner with regard to the overall system pressure. By connecting the fluid inlet channel to the cavity, the cavity is first vented.
  • a connection to the fluid outlet channel has not yet been established in this position. Only by moving the portafilter further In the direction of the filtering position, a very small flow cross section is initially released to the fluid outlet channel via the throttle recess, which, as described, results in a particularly gentle acceleration of the melt in the cavity, which, as stated, is particularly beneficial for a constant overall system pressure. If there was already a connection to the outlet channel when the cavity was vented, air bubbles could be forced through into the production process, which is undesirable.
  • the portafilter has an inlet throttle recess adjacent to the portafilter inlet, which is connected to the cavity in a fluid-conducting manner, and which, depending on the position of the inlet throttle recess relative to the fluid inlet channel in the venting position area, has a variable flow cross section between the cavity and releases the fluid inlet channel.
  • the inlet throttle recess extends along the longitudinal axis starting from the portafilter inlet and viewed in the screen changing position in the direction of the fluid outlet channel. In this way it is ensured that the cavity is first connected to the fluid outlet channel via the inlet throttle recess, which allows particularly sensitive flooding of the cavity.
  • the inlet throttle recess preferably has a cross section that changes in the direction of the longitudinal axis. Such a design of the inlet throttle recess has proven to be advantageous in order to enable the cavity to be filled particularly gently with regard to the overall system pressure.
  • the portafilter has at least one venting recess, which connects the cavity to the environment in a fluid-conducting manner depending on a position of the venting recess relative to the housing.
  • a venting recess has proven useful for influencing the venting process not only on the inlet side, ie in the area of the fluid inlet channel, but also in the area of an outlet.
  • the ventilation recess extends along the longitudinal axis. This means that the cross section available for the air outlet can be varied by positioning the portafilter and thus the ventilation recess relative to the housing.
  • the venting recess is a first venting recess
  • the portafilter has a second venting recess, which is connected to the cavity in a fluid-conducting manner, the second venting recess having a smaller longitudinal extent along the longitudinal axis than the first venting recess, and is arranged such that When the portafilter is moved from the screen changing position in the direction of the filtering position, the cavity is first vented via the first and second venting recesses and when the portafilter is moved further in the direction of the filtration position, the cavity is only vented via the first venting recess.
  • the portafilter preferably has a third venting recess, the third venting recess having a smaller longitudinal extent along the longitudinal axis than the second venting recess.
  • the first venting recess is connected in a fluid-conducting manner to a first portion of the cavity and/or the second venting recess is connected in a fluid-conducting manner to a second portion of the cavity and/or the third venting recess is connected in a fluid-conducting manner to a third portion of the cavity.
  • the portafilter in the venting position area is preferably first vented via all three venting recesses, although more than three, in particular four venting recesses can also be provided. Initially all, in particular all three, ventilation recesses are preferably connected to the surroundings of the filtering device. Typically, melt first emerges from the shortest venting recess, then with a delay of a few seconds, also from the medium-long venting recess, then also from the next longest venting recess and so on.
  • a connection of the respective venting recess to the environment is interrupted by successively advancing the portafilter towards the filtering position, first the connection of the shortest venting recess to the environment, then the medium-long venting recess and so on, until finally all the venting recesses are separated from the environment by retracting into the housing.
  • at least one, or in particular all, of the ventilation recesses is designed as a groove.
  • the cavity is preferably connected in a fluid-conducting manner only to the fluid inlet channel, but not to the fluid outlet channel. This enables gradual venting and reintroduction into the production process.
  • at least one, or in particular all, of the ventilation recesses is designed as a ventilation hole
  • the invention is further developed in that the filtering device has a control device which is set up and designed in such a way that it moves the portafilter further in the direction of the filtering position by means of control signals after the cavity has been vented, so that the fluid outlet channel is initially connected to the cavity exclusively by means of the throttle recess is connected in a fluid-conducting manner, and the portafilter is moved in the direction of the filtering position in such a way that a fluid pressure in the fluid inlet channel and / or in the fluid outlet channel remains within a definable pressure range.
  • a particularly advantageous control of the filtering device is achieved using the throttle recess.
  • a specific maximum pressure drop can also be defined, which to a certain extent specifies the feed speed of the screen bolt. For example, if a pressure drop that is too high is observed, the feed speed of the portafilter is reduced. On the other hand, the feed speed of the portafilter can also be increased if only a very small pressure drop was observed, which is lower than a defined limit value.
  • the portafilter can be advanced, for example, continuously or step by step, so that the reaction, such as the system pressure, to the changes can be waited for and assessed.
  • control logic also has the advantage that it is independent of material viscosities and throughputs.
  • the portafilter is vented in the venting position area by supplying a fluid via the fluid outlet channel, and wherein the portafilter has a throttle recess, in particular an acceleration groove, which is arranged adjacent to the portafilter inlet and conducts fluid the cavity is connected, and which, depending on a position of the throttle recess relative to the fluid inlet channel, releases a variable flow cross section between the cavity and the fluid inlet channel (claim 13).
  • a throttle recess in particular an acceleration groove
  • the throttle recess is also arranged adjacent to the portafilter inlet.
  • the filtering device according to the second aspect makes use of the same advantages and preferred embodiments as the filtering device according to the invention of the first aspect, taking into account the alternative operating principle and the location of the throttle recess. In this regard, reference is made to the above statements and their content is included here.
  • the housing has a backwash feed channel which is designed to supply the filter element in a backwash position area with backwash fluid starting from a clean side of the filter element to a dirty side, and a backwash channel, which is set up to discharge the backwash fluid after backwashing, the portafilter being movable into a backwash position area in that the backwash supply area is at least partially connected in a fluid-conducting manner to a clean side of the filter element, and the Backwash channel is at least partially connected in a fluid-conducting manner to the dirty side of the filter element, wherein the portafilter has a backwashing recess, which is arranged between the backwashing feed channel and the portafilter outlet and is fluidly connected to the cavity, and which depends on a position of the backwashing recess relative to the backwash feed channel in the backwash position area releases a variable flow cross section between
  • This third aspect of the invention or the advantageous development of the invention makes use of the knowledge that in the backwash position a connection to the backwash channel is open to a large volume, in particular completely.
  • the backwash quantity is adjusted via the backwash recess between the backwash feed channel and the cavity and thus in the area of the clean side of the filter element.
  • the backwash quantity can be adjusted as desired in order to minimize pressure fluctuations in the system.
  • a particular advantage here is that, unlike solutions known from the prior art, in which the amount of contaminated melt used for backwashing is adjusted, there are no larger dirt particles Have an impact on the backwashing behavior, whereby it was observed in particular in devices known from the prior art that dirt particles have to pass through a relevant bottleneck, occasionally blocking it and the backwashing therefore becomes ineffective.
  • the backwashing recess has a variable cross section along the longitudinal axis makes it possible to adjust the backwashing sensitively.
  • the throttling is set on the “clean” side. This prevents blockages.
  • throttling is carried out on the dirty side, which brings with it the risk of clogging or leads to a large opening with inevitably associated pressure fluctuations.
  • the backwash recess extends along the longitudinal axis starting from the portafilter outlet and viewed from the filtering position in the direction of the backwash feed channel.
  • This configuration ensures that the amount of melt supplied can be finely adjusted by varying the flow cross section between the backwash feed channel and the cavity.
  • the backwash recess has a cross section that changes in the direction of the longitudinal axis.
  • the cross section of the backwash recess tapers starting from the portafilter outlet in the direction of the longitudinal axis.
  • the cross section of the backwash recess tapers linearly starting from the portafilter outlet in the direction of the longitudinal axis.
  • the melt used for backwashing can be metered in very precisely and ensure that the overall system pressure remains within definable limits.
  • the cross section has a wedge-shaped or notch-shaped basic shape. This basic shape once again contributes to the precise metering of the melt used for backwashing.
  • the filtering device has a control device which is set up and designed in such a way that it changes the position of the portafilter when backwashing the portafilter by means of control signals so that the fluid pressure in the fluid inlet channel and/or in the fluid outlet channel during backwashing is within a definable pressure range remains, such that when the portafilter is moved in the backwash position area, a variable flow cross section between the backwash feed channel and the cavity is released by means of the backwash recess.
  • the invention has been described above with reference to a filtering device.
  • the invention relates to a method for operating a Filtering device, in particular a filtering device according to one of the above exemplary embodiments.
  • the invention solves the problem described at the beginning in relation to the method with the steps: venting the cavity, moving the portafilter by means of a control signal after venting the cavity in the direction of the filtering position so that the fluid outlet channel is initially connected to the cavity in a fluid-conducting manner exclusively by means of the throttle recess is, and the portafilter is moved in the direction of the filtering position such that a fluid pressure in the fluid inlet channel and / or in the fluid outlet channel remains within a definable pressure range (claim 21).
  • the method makes use of the same advantages and preferred embodiments as the filtering device according to the invention and vice versa.
  • the method according to the invention ensures that the melt within the cavity can be accelerated very slowly and sensitively after it has been vented by establishing a connection with the fluid outlet channel by means of the throttle recess, so that it is ensured that a fluid pressure in the fluid inlet channel or fluid outlet channel within a defined pressure range remains.
  • the method is further developed, in particular for filter devices with backwashing functionality, by the step: moving the portafilter in the direction of the backwashing position area by means of control signals such that the fluid pressure in the fluid inlet channel and / or in the fluid outlet channel remains within a definable pressure range during backwashing, whereby when moving the Portafilter in the direction of the backwash position area, a variable flow cross section between the backwash feed channel and the cavity is released by means of the backwash recess, the backwash recess being arranged between the backwash feed channel and the portafilter outlet and connected to the cavity in a fluid-conducting manner.
  • backwashing also ensures that, on the one hand, pressure fluctuations caused by backwashing are avoided and, on the other hand, larger dirt particles have no effect on the backwashing behavior.
  • Fig. 1 shows a first embodiment of an inventive
  • Filter device in a side sectional view in a screen changing position
  • FIG. 2 shows the exemplary embodiment of the filtering device according to the invention in a sectional view transverse to a portafilter longitudinal axis
  • Figs. 3 and 4 show the embodiment of the filtering device according to the invention in a first venting position
  • Figs. 5 and 6 show the embodiment of the filtering device according to the invention in a second venting position
  • Figs. 7 and 8 show the exemplary embodiment of the filtering device according to the invention in a third venting position
  • Figs. 9 to 10 show the exemplary embodiment of the filtering device according to the invention in an acceleration position range
  • 11 to 12 show the exemplary embodiment of the portafilter according to the invention in one
  • Figs. 13 to 15 a second embodiment of a filtering device according to the invention in different representations in a filtering position
  • Figs. 16 and 17 show the second embodiment of the portafilter according to the invention in different operating positions on the way to a backwash position
  • Figs. 18 and 19 the second embodiment of the portafilter according to the invention in a backwash position.
  • Fig. 1 shows a filter device 2 for filtering a fluid.
  • the fluid is in particular a liquefied plastic.
  • the filtering device 2 comprises a housing 4.
  • the housing 4 has a receptacle 6 for receiving a portafilter 8.
  • the housing 4 also has a fluid inlet channel 10 and a Fluid outlet channel 12.
  • a portafilter 8 is accommodated in the receptacle 6.
  • Each of the portafilters 8 is movably accommodated within the receptacle 6 along a longitudinal axis 26.
  • the portafilter 8 has a portafilter inlet 16, a portafilter outlet 18 and a cavity 20 for receiving a filter element 22.
  • the cavity 20 is fluidly connected to the portafilter inlet 16 and the portafilter outlet 18.
  • the upper portafilter 8 is shown in a screen changing position S.
  • the filter element 22 can be replaced.
  • the portafilter 8 can be moved from the screen changing position S shown in FIG. 1 via a venting position area E into a filtering position F.
  • the portafilter 8 has a throttle recess 24.
  • the throttle recess 24 is arranged adjacent to the portafilter outlet 18 and connected to the cavity 20 in a fluid-conducting manner.
  • the throttle recess 24 extends along the longitudinal axis 26 starting from the portafilter outlet 18 and, viewed from the screen changing position S, in the direction of the fluid outlet channel 12.
  • the throttle recess 24 has a cross section 28 that changes in the direction of the longitudinal axis 26.
  • the cross section 28 of the throttle recess 24 tapers starting from the portafilter outlet 18 in the direction of the longitudinal axis 26, in particular linearly.
  • the cross section 28 has a wedge-shaped basic shape 32.
  • the portafilter 8 also has an inlet throttle recess 34 adjacent to the portafilter inlet 16.
  • the inlet throttle recess 34 is also connected to the cavity 20 in a fluid-conducting manner.
  • the inlet throttle recess 34 extends along the longitudinal axis 26 starting from the portafilter inlet 16 and, viewed from the screen changing position S shown in FIG. 1, in the direction of the fluid inlet channel 10.
  • the inlet throttle recess 34 points in the direction of the longitudinal axis 26 changing cross section 36.
  • the portafilter 8 also has a first vent recess 40, a second vent recess 42 and a third vent recess 44.
  • the ventilation recesses 40, 42, 44 connect the cavity 20 to the environment in a fluid-conducting manner depending on the positions of the ventilation recesses 40, 42, 44 relative to the housing 4.
  • the ventilation recesses 40, 42, 44 extend along the longitudinal axis 26.
  • the second vent recess 42 has a smaller longitudinal extent along the longitudinal axis 26 than the first vent recess 40.
  • the third vent recess 44 has a smaller longitudinal extent along the longitudinal axis 26 than the second vent recess 42.
  • the ventilation recesses 40, 42, 44 are designed as a groove.
  • the filtering device 2 also has a control device 52.
  • the control device 52 is set up and designed in such a way that it moves the portafilter 8 further in the direction of the filtering position F by means of control signals after the cavity 20 has been vented in an acceleration position range B (see FIGS. 9 and 10) in such a way that the fluid outlet channel 12 is initially exclusively with the throttle recess 24 is fluidly connected to the cavity 20, and the portafilter 8 is moved in the direction of the filtering position F in such a way that a fluid pressure in the fluid inlet channel 10 and/or in the fluid outlet channel 12 remains within a definable pressure range.
  • Fig. 2 shows a sectional view of the filtering device 2 in the operating state according to Fig. 1.
  • Figures 3 and 4 show the filtering device 2 in a first venting position. In this position, the inlet throttle recess 34 is at least partially overlapping the fluid inlet channel 10. In other words, a fluid-conducting connection between the fluid inlet channel 10 and the cavity 20 is established via the inlet throttle recess 34 (in Fig. 4 by flow arrows in the area of Fluid inlet channel 10 indicated), so that melt can flow from the fluid inlet channel 10 into the cavity 20, in a very finely metered manner.
  • a variable flow cross section 38 is released between the cavity 20 and the fluid inlet channel 10.
  • the cavity 20 is connected in a fluid-conducting manner exclusively to the fluid inlet channel 10 during venting.
  • the ventilation recesses 40, 42, 44 are connected to the surroundings of the filtering device 2, so that air can flow out of the cavity 20 when melt flows into the cavity 20.
  • the ventilation recess 40 is provided with a first portion 46 of the cavity 20 connected in a fluid-conducting manner.
  • the ventilation recess 40 has a tap hole.
  • the second ventilation recess 42 is connected to a second portion 48 of the cavity 20 in a fluid-conducting manner.
  • the third ventilation recess 44 is connected to a third portion 50 of the cavity 20 in a fluid-conducting manner.
  • FIGS. 9 and 10 show a further venting step, in which only the first venting recess 40 is connected to the environment and in particular that portion 46 of the cavity 20 which is arranged adjacent to the filter element 22 is vented.
  • the cavity 20 In the acceleration position region B shown in FIGS. 9 and 10, the cavity 20 is completely vented and there is a fluid-conducting connection to the fluid inlet channel 10 (indicated by flow arrows in FIG. 10).
  • the ventilation recesses 40, 42, 44 are no longer connected to the environment of the filter device 2.
  • the throttle recess 24 now comes into contact with the fluid outlet channel 12.
  • a variable flow cross section 30 between the cavity 20 and the fluid outlet channel 12 is selective released and can be dosed sensitively.
  • the filtering device 102 has a housing 104 with a receptacle 106 for receiving a portafilter 108.
  • the housing 104 further has a fluid inlet channel 110 and a fluid outlet channel 112.
  • a portafilter 108 with a portafilter inlet 116 and a portafilter outlet 118 (see FIG. 14) is movably accommodated within the receptacle 106 along a longitudinal axis 126.
  • the portafilter 108 also has a cavity 120 for receiving a filter element 122. As can be seen in particular from FIG. 14, the cavity 120 is fluidly connected to the portafilter inlet 116 and the portafilter outlet 118. 13 and 14, the portafilter 108 is in a filtering position F, in which fluid to be filtered flows into the cavity 120 via the fluid inlet channel 110, is filtered therein by the filter element 122 and the cavity 120 then via the fluid outlet channel 1 12 leaves.
  • the housing 104 also has a backwash supply channel 154.
  • the backwash feed channel 154 is designed to supply backwash fluid to the filter element 122 in a backwash position range R from a clean side 156 of the filter element 122 to a dirty side 158.
  • the housing 104 also has a backwash channel 160.
  • the backwash channel 160 is designed to remove the backwash fluid after backwashing.
  • the portafilter 108 can be moved into a backwash position area in which the backwash feed channel 154 is at least partially connected to a clean side 156 of the filter element 122 in a fluid-conducting manner.
  • the portafilter 108 also has a backwash recess 162.
  • the backwash recess 162 is arranged between the backwash supply channel 154 and the portafilter outlet 118 and is connected to the cavity 120 in a fluid-conducting manner.
  • the backwash recess 162 extends along the longitudinal axis 126 starting from the portafilter outlet 118 and, viewed from the filtering position F, in the direction of the backwash feed channel 154.
  • the backwash recess 162 has a cross section 166 that changes in the direction of the longitudinal axis 126.
  • the cross section 166 of the backwash recess 162 tapers starting from the portafilter outlet 118 in the direction of the longitudinal axis 126, in particular linearly.
  • the cross section 166 has a wedge-shaped basic shape 132.
  • the filtering device 102 also has a control device 152.
  • the control device 152 is set up and designed in such a way that it changes the position of the portafilter 108 when backwashing the portafilter 108 by means of control signals so that the fluid pressure in the fluid inlet channel 110 and/or in the fluid outlet channel 112 remains within a definable pressure range during backwashing, such that when the portafilter 108 moves in the backwash position area R, a variable flow cross section 164 between the backwash feed channel 154 and the cavity 120 is released by means of the backwash recess 162.
  • the filtering device 102 is, as stated, in the filtering position F. Fluid or melt is supplied via the fluid inlet channel 110, enters the cavity 120, is filtered there by means of the filter element 122 and leaves the housing 104 finally via the fluid outlet channel 112 and the backwash feed channel/fluid outlet channel 154 (indicated by flow arrows in FIG. 14).
  • the portafilter 108 was moved to the right as seen in the plane of the drawing, such that a connection between the cavity 120 and the fluid outlet channel 112 is initially interrupted. If the portafilter 108 is now moved further to the right in the plane of the drawing, as shown in FIG. 17, the connection to the fluid inlet channel 110 is also separated. At the same time, however, a connection between the cavity 120 and the backwash channel 160 is established.
  • the portafilter 108 has now been moved even further to the right, such that the backwash recess 162 comes into contact with the backwash feed channel 154.
  • backwash fluid in the direction of the flow arrows
  • backwash fluid arrives Plastic melt, starting from the backwash feed channel 154 via the backwash recess 162 into the cavity 120, in particular to the clean side of the filter element 156.
  • the backwash fluid passes through the filter element 122 counter to the filtering direction, thereby cleaning it and finally the contaminated backwash fluid passes through the backwash channel 160 discharged.
  • a variable flow cross section 164 between the return feed channel 154 and the cavity 120 can be adjusted very finely, so that during the course of backwashing the effects on the overall system pressure remain within narrowly definable limits.
  • the method for operating the filtering device 2 includes the steps:
  • the procedure is as follows:
  • variable flow cross section at the backwash recess 166 cross section of the backwash recess

Landscapes

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

Abstract

L'invention concerne un dispositif de filtration (2) pour filtrer un fluide, en particulier une matière plastique liquéfiée, comprenant un boîtier (4) comportant un logement (6) pour recevoir un support de tamis (8), un canal d'entrée de fluide (10) et un canal de sortie de fluide (12), un support de tamis (8) reçu de manière mobile le long d'un axe longitudinal (26) à l'intérieur du logement (6), comportant une entrée de support de tamis (16), une sortie de support de tamis (18) et une cavité (20) pour recevoir un élément filtrant (22), la cavité (20) étant reliée fluidiquement à l'entrée de support de tamis (16) et à la sortie de support de tamis (18), et le support de tamis (8) pouvant être déplacé d'une position de changement de tamis (S) à une position de filtration (F) par l'intermédiaire d'une zone de position de ventilation (E). Selon l'invention, le support de tamis (8) comporte un évidement d'étranglement (24) adjacent à la sortie de support de tamis (18) et relié de manière fluidique à la cavité (20) et qui libère une section d'écoulement (30) variable entre la cavité (20) et le canal de sortie de liquide (12), en fonction de la position de l'évidement d'étranglement (24) par rapport au canal de sortie de fluide (12) dans la zone de position de ventilation (E).
EP23715595.7A 2022-03-18 2023-03-20 Dispositif de filtration pour filtrer un fluide et procédé de fonctionnement correspondant Pending EP4493386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022106334.8A DE102022106334A1 (de) 2022-03-18 2022-03-18 Filtriervorrichtung zum Filtrieren eines Fluids sowie betreffendes Betriebsverfahren
PCT/IB2023/052726 WO2023175594A1 (fr) 2022-03-18 2023-03-20 Dispositif de filtration pour filtrer un fluide et procédé de fonctionnement correspondant

Publications (1)

Publication Number Publication Date
EP4493386A1 true EP4493386A1 (fr) 2025-01-22

Family

ID=85937010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23715595.7A Pending EP4493386A1 (fr) 2022-03-18 2023-03-20 Dispositif de filtration pour filtrer un fluide et procédé de fonctionnement correspondant

Country Status (6)

Country Link
US (1) US20250196422A1 (fr)
EP (1) EP4493386A1 (fr)
JP (1) JP2025508234A (fr)
CN (1) CN118829535A (fr)
DE (1) DE102022106334A1 (fr)
WO (1) WO2023175594A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024114848A1 (de) * 2024-05-27 2025-11-27 Nordson Corporation Filtriervorrichtung zum Filtrieren eines Fluids sowie betreffende Betriebsverfahren
DE102024115886A1 (de) * 2024-06-06 2025-12-11 Nordson Corporation Verfahren zum Filtrieren eines Fluids, insbesondere eines verflüssigten Kunststoffes, mittels einer Filtriervorrichtung mit mehreren Siebstellen, sowie Filtriervorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29611292U1 (de) 1995-12-07 1996-10-31 Kreyenborg Verwaltungen und Beteiligungen GmbH & Co. KG, 48157 Münster Filtereinrichtung für Strangpreß- und Spritzgießmaschinen
DE20319832U1 (de) 2003-12-16 2004-05-13 Trendelkamp Technologie Gmbh Siebwechselvorrichtung
DE102006019445A1 (de) 2006-04-24 2007-10-25 Maag Pump Systems Textron Gmbh Verfahren zur Steuerung einer kunststoffverarbeitenden Anlage und kunststoffverarbeitende Anlage
DE102012104924A1 (de) * 2012-06-06 2013-12-12 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Filtriervorrichtung für Fluide
DE102017115295B3 (de) 2017-07-07 2018-10-25 Nordson Corporation Filtriervorrichtung und Verfahren zum Betreiben derselben

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WO2023175594A1 (fr) 2023-09-21
DE102022106334A1 (de) 2023-09-21
CN118829535A (zh) 2024-10-22
US20250196422A1 (en) 2025-06-19
JP2025508234A (ja) 2025-03-21

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