WO2018184722A1 - Dispositif filtrant pour un fluide - Google Patents

Dispositif filtrant pour un fluide Download PDF

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Publication number
WO2018184722A1
WO2018184722A1 PCT/EP2018/000151 EP2018000151W WO2018184722A1 WO 2018184722 A1 WO2018184722 A1 WO 2018184722A1 EP 2018000151 W EP2018000151 W EP 2018000151W WO 2018184722 A1 WO2018184722 A1 WO 2018184722A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
fluid
piston
flow body
filter housing
Prior art date
Application number
PCT/EP2018/000151
Other languages
German (de)
English (en)
Inventor
Wilfried Leuders
Manfred Hangmann
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 WO2018184722A1 publication Critical patent/WO2018184722A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
    • 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
    • B29C48/256—Exchangeable extruder parts
    • 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
    • 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
    • B29C48/2735—Cleaning; Purging; Avoiding contamination of filters using scrapers
    • 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
    • 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
    • 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
    • B29C48/6914—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a rotatable or pivotable disc or on the circumference of a rotatable or pivotable cylinder
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/409—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using manual data input [MDI] or by using control panel, e.g. controlling functions with the panel; characterised by control panel details or by setting parameters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G06F3/167—Audio in a user interface, e.g. using voice commands for navigating, audio feedback
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B25/00—Accessories or auxiliary equipment for turning-machines
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/35—Nc in input of data, input till input file format
    • G05B2219/35453—Voice announcement, oral, speech input
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45136—Turning, lathe

Definitions

  • the invention relates to a filter arrangement for a fluid with a filter housing, wherein a) the filter housing contains an inlet opening for an inlet channel and an outlet opening for an outlet channel,
  • the flow body has a filter support wall, whereby a hollow body is formed with an interior space and an exterior space,
  • a slidable cleaning punch is provided which removes deposits on the filter support wall.
  • the invention relates to a filter arrangement for a fluid according to the preamble of independent patent claim 18.
  • Such filter arrangements are used in plastics processing.
  • a plastic granulate, regrind or powdered ingredients is often heated to liquid plastic to process it.
  • the plastic granulate is often made of recycled material, which often contains impurities by foreign particles.
  • extruders are used as plastics processing plants. Extruders are conveying devices which, in accordance with the principle of the screw conveyor, uniformly press solid to viscous masses out of a shaping opening under high pressure and high temperature. Other systems use this e.g. also gear pumps.
  • the heated and viscous plastic is also mixed with pure particles usually with dirt particles. These dirt particles must be kept out of the plastic processing plants.
  • suitable filters are used, which filter out these dirt particles from the liquid plastic.
  • the liquid plastic is passed under pressure through the filter assembly before the raw material in the plastic processing plant is processed further.
  • the screen filters In order to obtain a uniform processing process, as constant a processing pressure as possible is required.
  • the screen filters In the filter arrangements, the screen filters must be regularly replaced or cleaned.
  • various changing devices are used, the currently used screen changing systems include the Kolbensiebwechsler, the Siebradfilter, the belt screen changer, the rotary screen changer and the flat slide.
  • the screen changing systems usually operate automatically, i. mechanically or hydraulically driven. However, there are also manual Sieb grillsysteme in use.
  • the Filtriervorrichtüng has a housing with a fluid supply channel and with a fluid discharge channel. It is further disclosed that the housing is provided with two parallel to each other and spaced holes for axially displaceable and fluid-tight storage, each with a bolt.
  • the housing has a passage opening with a filter. As viewed in the flow direction of the fluid to be filtered, a connecting channel is provided in the housing which connects the passage openings downstream of the filter with a displaceable feed of filtered fluid displaceable axially between a first position and a second position and vice versa.
  • a fluid removal channel for filtered fluid branches off from the storage space, so that in the first position of the displacement piston, in which no filtered fluid is stored in the reservoir, the storage space but is constantly flowed through by filtered fluid. From its second position, the displacement piston is first transferred by a radial rotation into an intermediate position in which filtered fluid is stored in the reservoir. After that, by the axial displacement in the first position in which the stored fluid stored in the reservoir in the at least one fluid discharge channel or after an axial displacement of the associated bolt in a downstream side of the filter into the passage opening then emptying flushing channel emptied.
  • the filtration device comprises a housing with an inlet channel and an outlet channel and a longitudinally displaceable to a housing bore filter support element with at least one filter insert.
  • the filter insert is arranged in a production position in a filter chamber between the inlet channel and the outlet channel of the housing.
  • the filter element has a flow-through base element, from which a fluid flow branches off to a plurality of individual filter elements or in which a plurality of fluid streams from the individual filter elements are combined.
  • the filter insert is arranged on an end face of the filter carrier element.
  • the filter chamber is formed by a housing bore which extends to an orifice on a housing outside and in which the filter insert is to be inserted by displacement of the filter support member.
  • a closure element can be placed on the mouth of the housing bore and / or inserted therein when the filter support element is lowered into the housing bore or subsequently onto it.
  • a device for filtering a fluid in particular for filtering a thermoplastic polymer melt, with a housing having a fluid supply channel, a fluid discharge channel and a bore disposed therein is described.
  • the bore is in fluid communication with the fluid supply channel and the fluid discharge channel, respectively.
  • a bolt is mounted axially displaceable.
  • the bolt is thereby provided with a filter test with an inflow side and a downstream side, wherein the inflow side of the filter test in fluid communication with the fluid supply channel can be brought.
  • the downstream side of the filter test can be brought into fluid communication with the fluid discharge channel.
  • the bolt is sealed against the housing by means of a form-locking clamped between the bolt and housing ring seal.
  • DE 20 2013 003 829 U1 also discloses a filter device for filtering fluid with a housing in which a filter holder with a screen cavity is provided.
  • the Siebkavtician has a dirty side and a clean side.
  • In the Siebkavtician is a filter element which is arranged displaceably in the housing.
  • the housing further has an inlet opening and a drain opening.
  • a feed channel leads from the inlet opening to the dirty side of the screen cavity.
  • a discharge channel leads from the clean side of the Siebkavtician to the drain opening.
  • the inlet opening and the associated feed channel extend in a first direction.
  • the drain opening and the associated discharge channel extend in a direction inclined relative to the first direction and / or offset in a second direction.
  • the supply channel and the discharge channel extend accordingly in the portafilter.
  • a device for filtering a plastic melt with a housing which has an inlet channel and an outlet channel for the plastic melt.
  • the inlet channel is separated from the outlet channel by a filter cavity for receiving a filter pin axially displaceable therein.
  • the filter pin has a filter base body with a filter surface with there through the filter body passing through the filter openings. Through the filter openings, the plastic melt passes through to a Filtrathohlraum in the filter body.
  • the filtrate cavity is in fluid communication with the exit channel.
  • the filter surface of the filter body is covered by a pleated filter. In axially smoothed edge regions of the pleated filter screen clamping elements are provided.
  • DE 10 2014 009 666 A1 discloses a melt filter arrangement with a melt channel, a backwash channel and a sieve device for filtering melt in the melt channel.
  • the melt channel and the backwashing channel extend through the screening device at different areas of the screening device.
  • the melt filter arrangement further comprises a backwash screw conveyor within the backwash channel. This generates or defines as a continuous conveying element, the flow in the backwash channel.
  • a melt filter with a sieve insert receiving, rotatable screen disc is known.
  • a drive device for the rotatable screen disk By means of a drive device for the rotatable screen disk, a strainer insert within the melt filter can be moved into a melt stream in such a way that the strainer insert lies opposite a melt feed opening.
  • a piston is designed for backwashing and / or flooding such that the drive device for. the backwashing and / or flooding simplified.
  • the piston is in operative connection with the drive device.
  • About the drive device is a backwash and / or flooding driven.
  • a filter arrangement for fluids in particular plasticized plastics materials, which has a filter receptacle with a filter chamber and a filter held detachably therein.
  • the filter comprises a removable and fixable in the filter chamber filter carrier with a filter element.
  • EP 1 519 823 B1, EP 1 697 018 B1, WO 2008/031127 A1 and AT 503 788 A4 disclose filter devices for plasticized plastics materials which have a rotationally driven filter with a disk or cylindrical filter element and a device for removing filter residues having a likewise rotationally driven discharge device.
  • DE 44 06 549 AI shows a method and apparatus for cleaning of polymeric plastics, wherein the filter element is formed as a one-piece and sintered hollow cylinder, which is mounted on a screw and loose in a Filter chamber is inserted, with its axial position is secured by shoulders on screwed housing parts.
  • DE 10 2010 055 167 AI relates to a device for the continuous filtering of material mixtures, in particular for the separation of impurities from plastic melts, with a rotatably arranged in a filter chamber of a housing filter.
  • a scraper lifts off the contaminants retained by the filter.
  • a discharge device transports the contaminants lifted off the filter by the wiper from the housing.
  • the discharge device contains an im. Housing rotatably arranged discharge shaft, which has a through opening with a displaceably guided in this transversely to the axis of rotation of the discharge shaft piston.
  • the filter apparatus includes a housing with an inlet and a drain. Within the housing, a core tube is arranged, the interior of which is sealed to the inlet connected.
  • the core tube has numerous longitudinally extending rows of openings spaced radially from one another and connecting the interior of the core tube to the outside thereof. Numerous filter elements, each having an inlet and an outlet as well as interposed filter means, are provided.
  • the filter elements are arranged on the core tube so that their inlets are in fluid communication with the openings in the core tube.
  • the filter means may thereby remove the contaminants from the fluid flowing through the filter medium.
  • Two pistons attached to a hollow connecting rod are slidably disposed inside the core tube. Each piston has longitudinally extending fluid passages and radially extending communication channels. The connection channels can provide a flow connection between the inlet of the filter elements and the interior of the connecting rod.
  • a fluid chamber surrounds the filter elements within the housing. The fluid chamber conducts the cleaned fluid or filtrate to the drain.
  • a positioning device brings the piston in position.
  • the filter elements are spaced apart.
  • a means for generating a pressure in the connecting rod is provided. The pressure is less than the pressure in the fluid chamber for filtrate to backwash the filter elements. Means for discharging the contaminated backwashing fluid through the connecting rod without contaminating the filtrate are associated with a positioning device.
  • the known filter arrangements with a screen change system have the disadvantage that the screens due to the deposits do not have a long service life and therefore change frequently Need to become. This reduces productivity. In addition, there are downtime during filter replacement, which lead to production stoppage. In addition, there are pressure fluctuations, which can lead to problems in the production process of plastic parts.
  • the known systems for changing the filters are constructed relatively complicated or complicated and thus expensive to manufacture. In addition, the known change systems are very user-friendly.
  • An object of the invention is therefore to avoid the disadvantages of the prior art and to provide a filter assembly for liquid media, in particular for liquid plastic, with which can achieve a long service life for the filter.
  • the object of the invention is also to increase productivity.
  • Another object of the invention is to provide a filter assembly, in particular for plastic processing equipment, which is simple in construction and can be produced inexpensively.
  • the object is achieved in that in a filter arrangement for a fluid of the type mentioned g) the flow body is provided in a portion of a piston, wherein the piston is slidably formed in the filter housing to a stop in a piston guide, so that the Flow body is guided to change out of the filter housing.
  • the invention is based on the principle of initially removing the deposits on the filter support wall by means of a cleaning punch in a known manner.
  • the fluid usually a molten plastic
  • the fluid is passed through an inlet opening of the filter housing into the flow body.
  • the fluid flows through the filter support wall of the flow body to get from the interior of the flow body in the outer space. Particles of a certain diameter will stick to the filter support wall as a deposit.
  • the cleaned fluid finally passes through the outlet opening into a working area. Nevertheless, it comes to the fact that the filtering flow body must be replaced. This process has been relatively tedious and complicated. To shorten and facilitate this process, the flow body is provided in the wall of a piston, which is pushed out to change out of the filter housing.
  • the piston is largely a hollow body with a wall, for example, has a cylindrical shape.
  • the flow body is provided, for example in the wall thereof.
  • the wall of the rinsing piston obstructs the inlet to the flow body.
  • a preferred embodiment of the invention is that a second flow body corresponding to the first flow body is arranged in the filter housing in a second piston, wherein the second piston in the filter housing to a stop in a piston guide is slidably formed, so that the second flow body for changing out of the filter housing can be performed.
  • a preferred embodiment of the filter arrangement according to the invention for a fluid with a filter housing is that the pistons are provided for changing the flow body asynchronously displaceable in the piston guides.
  • the flow body can be replaced alternately.
  • the machine, in which such a filter assembly is used to change the flow body must not be turned off.
  • the pistons can be alternately pushed out of the filter housing to change the flow body. While a flow body is in use and takes over the filtering action of the other flow body, the other flow body can be replaced and / or maintained or cleaned. For this purpose, the inlet channel is shut off to the filtering flow body so that the fluid does not get into the machine unfiltered.
  • a preferred embodiment of the filter arrangement according to the invention consists in that in each case one inlet channel and one outlet channel are provided for each flow body. This measure serves to enable each flow body to be controlled separately for filtering. In this case, an inlet channel and an outlet channel of a flow body can be shut off. This facilitates the implementation of a change or maintenance of a flow body. The tasks or functions of the flow body can be divided completely and separately in this way.
  • a further advantageous embodiment of the filter arrangement according to the invention is that the cleaning punches are provided asynchronously displaceable.
  • the cleaning punches can be used asynchronously. For example, they are only put into operation if there is an increased contamination of a filter surface. This can be determined, for example, by a pressure drop or increase with a suitable pressure sensor at the appropriate location in the filter housing.
  • the cleaning punch is in contact with the filter support wall and is pulled or pushed along it. He covers the filter support wall of the Flow body in only small sections, so that the function of the filter itself is not disturbed.
  • the cleaning stamp lifts the deposits, allowing them to be removed from the filter.
  • the cleaning stamp is completely enclosed by the filter support wall. There is thus the possibility that the cleaning punch can be guided over the entire surface in the interior of the flow body. Because the cleaning punch is only passed over the filter support wall in small sections, the filter support wall of the flow body is not completely covered. This leaves enough area in the filter support wall to ensure the filter function of the filter assembly.
  • the cleaning punch preferably has a relatively flat punch disc.
  • the flat punch disc is understood to mean a disc-like body which can be moved in an axial direction to the filter support wall. The systems in which such filter assemblies are installed, can significantly extend the life.
  • the hollow body is substantially cylindrical.
  • the punch disc can be created much easier.
  • a seal between the cleaning punch and the cylindrical hollow body can also be realized more easily with a circular punch disc.
  • the cleaning punch has a flushing piston arranged in parallel with the filter support wall and having a channel. Deposits can be removed via the channel of the flushing piston from the interior of the flow body.
  • a further advantageous embodiment of the filter arrangement according to the invention also results from the fact that a groove is provided on the circumference of the cleaning punch, which channel is connected to the channel of the flushing piston via a spoke channel. Deposits can now be transported away from the channel via the spoke channel and the channel of the flushing piston. If the pressure in the outer space is greater than the pressure in the channel system, which consists of the channel, the spoke channel and the channel of the flushing piston, the deposits are flushed through the channel system. The oppressor takes away the deposits. The suppression occurs only in the area of the cleaning punch at the openings of the filter support wall.
  • the channel system is connected to the external environment of the filter housing.
  • the deposits thus reach the outside during the cleaning process.
  • a further preferred embodiment of the filter arrangement for a fluid is that a drive mechanism is provided for the cleaning punch, which the Cleaning stamp along the filter support wall leads.
  • the drive may be formed for example by an electric motor which drives a spindle gear. The spindle pushes and pulls the cleaning punch along the filter support wall of the flow body. This is another step to automate the cleaning process.
  • Suitable control technology can be used to define intervals within which the cleaning process is to be carried out. If necessary, the cleaning intervals can also be adapted to the degree of contamination of the fluid. For the more contaminated a fluid is, the more often the flow body or its filter support wall has to be cleaned.
  • An advantageous embodiment of the filter arrangement according to the invention for a fluid further consists in that the openings are arranged annularly around and in the filter support wall.
  • the openings are provided in ring sections around the filter support wall. This measure has the advantage that always only one ring section is cleaned. Sequential can thus clean ring section for ring section. The remaining ring sections still filter the fluid.
  • a further preferred embodiment of the filter arrangement according to the invention for a fluid results from the fact that the inlet opening is connected to the interior.
  • the measure serves to ensure that the fluid first reaches the interior of the flow body. From the interior of the flow body, it passes through the filter support wall and finally passes filtered into the outer space.
  • the outlet opening is connected to the outside space.
  • the filtered fluid can be routed out of the filter housing for further processing.
  • an advantageous embodiment of the filter arrangement according to the invention for a fluid is achieved in that the filter housing has a detachable housing cover, through which the flushing piston is guided.
  • This measure serves to provide a way to replace the flow body can. For example, by wearing or changing the required openings, replacement may be necessary.
  • the housing cover Since the flushing piston is to communicate with the outside environment, the flushing piston is guided through an opening in the housing cover.
  • a further advantageous embodiment of the filter arrangement according to the invention for a fluid is achieved in that a pressure generator is provided which presses the fluid with pressure into the interior of the flow body for filtering.
  • the pressure for the fluid is generated for example with a gear pump.
  • the fluid is pushed through the filter support wall of the flow body for filtering. Particles whose diameter is greater than the diameter of the openings, remain in the interior of the flow body.
  • a filter element in the outer space is arranged on the filter support wall of the hollow body.
  • a filter screen - for example, metal or metal alloys - used, which can filter out particles from the liquid.
  • the filter element preferably hugs the filter support wall. While the filter support wall already filters out coarse particles from the fluid, even smaller particles can be filtered out with the filter element. Due to the two-stage filter system it is not so easy to production-inhibiting deposits. Because the coarse particles are already removed on the filter support wall with the cleaning punch. By partial backwashing effects in the case of the cleaning die with gutter deposits on both the filter element and the filter support wall can be removed. The backwashing effects are achieved by pressure differences between the outer space and the channel, which communicates, for example, with the outside environment of the filter housing.
  • the filter element between the hollow body and a hollow body surrounding the perforated plate is arranged.
  • the perforated plate ensures in particular that the filter element does not shift or deform at high heat or high pressure. Through the perforated plate results for the filter element a sufficient dimensional stability.
  • a filter element may be arranged in the interior of the hollow body in an embodiment of the filter assembly according to the invention, a filter element. This measure serves to receive particles in the interior of the flow body if necessary. Through different but smaller mesh size or openings, a multi-stage filter system can be formed, which filters out different particles from the liquid depending on the mesh size.
  • the flow of fluid within the filter housing can be of considerable importance.
  • a special variant of the filter assembly according to the invention therefore that the filter elements and / or the perforated plate with respect to a longitudinal axis in longitudinal section have a concave, trapezoidal or other curved or curved shape.
  • FIG. 1 shows a longitudinal section of a filter arrangement according to the invention for a fluid, in which the cleaning punch is arranged in a rest position.
  • FIG. 2 shows in a longitudinal section according to FIG. 1 a filter arrangement according to the invention for a fluid, in which the cleaning punch is shown in an operating position.
  • Fig. 3 shows in a longitudinal section a filter arrangement according to the invention for a fluid with a piston which has a working position in the filter housing, so that the flow body in the filter housing has an operating position, wherein the cleaning punch is in the rest position.
  • FIG. 4 shows, in a schematic longitudinal section according to FIG. 3, a filter arrangement according to the invention for a fluid with a piston which is provided in the working position in the filter housing, the cleaning ram being shown in an operating position.
  • FIG. 5 shows, in a schematic longitudinal section according to FIGS. 3 and 4, a filter arrangement according to the invention for a fluid with a piston which is provided in the working position in the filter housing, the cleaning punch being shown in a final cleaning position.
  • FIG. 6 shows, in a schematic longitudinal section according to FIGS. 3-5, a filter arrangement according to the invention for a fluid in which the piston is provided in a change position in the filter housing for changing the flow body, the cleaning stamp being shown in the final cleaning position.
  • FIG. 7 shows, in a schematic cross section, the filter arrangement according to the invention, in which the filter housing is shown with two pistons, two flow bodies, and cleaning punches disposed in the flow bodies.
  • FIG. 8a shows a schematic longitudinal section of the filter arrangement according to the invention with a curved filter element in a first position of the cleaning ram in the rest position.
  • FIG. 8b shows, in a schematic longitudinal section, the filter arrangement according to the invention with a curved filter element in a second position of the cleaning ram in working position.
  • FIG. 8c shows in a schematic longitudinal section the filter arrangement according to the invention with a curved filter element in a third position of the cleaning ram in an end position.
  • FIG. 8d shows a schematic longitudinal section of the filter arrangement according to the invention with a curved filter element in a fourth position of the cleaning punch in a screen change position in which the piston is led out of the filter housing.
  • FIG. 9a shows, in a schematic longitudinal section, the filter arrangement according to the invention with a conical outer space in a first position of the cleaning ram in the rest position.
  • FIG. 9b shows, in a schematic longitudinal section, the filter arrangement according to the invention with a conical outer space in a second position of the cleaning ram in the working position.
  • FIG. 9c shows, in a schematic longitudinal section, the filter arrangement according to the invention with a conical outer space in a third position of the cleaning ram in an end position.
  • FIG. 9d shows in a schematic longitudinal section the filter arrangement according to the invention with a conical outer space in a fourth position of the cleaning punch in a screen change position in which the piston is led out of the filter housing.
  • FIGS. 8a to 8d shows in a schematic cross section the filter arrangement according to the invention according to FIGS. 8a to 8d.
  • FIG. 11 shows in a schematic cross section the filter arrangement according to the invention according to FIGS. 9a to 9d.
  • 10 is a filter arrangement according to the invention for a fluid, such as liquid Plastic, called.
  • the filter assembly 10 is shown in a longitudinal section.
  • the filter assembly 10 comprises a filter housing 12, which is closed at its end face 14 with a housing cover 16.
  • the housing cover 16 can be removed from the filter housing 12.
  • the filter housing 12 has an inlet opening 18, to which an inlet channel 20 connects.
  • the inlet channel 20 opens into an interior 22 of a flow body 24.
  • the flow body 24 consists in the present embodiment of a cylindrical hollow body 26.
  • the cylindrical hollow body 26 is formed by a perforated filter support wall 28. Openings 29 of the sieve-shaped filter support wall 28 can be adapted in their diameter to the material to be processed.
  • a cylindrical perforated plate 30 surrounds the flow body 24. Between the filter support wall 28 and the cylindrical perforated plate 30, a filter element 31 is provided.
  • the filter element 31 consists in the present embodiment of a sieve, which can be varied in mesh size as needed.
  • the fluid is pressed into the interior 22 of the flow body 24. Due to the pressure with which the fluid is pressed into the cylindrical hollow body 26, the fluid finally passes through the perforated filter support wall 28 into an outer space 32, which is located outside the flow body 24.
  • the outer space 32 is defined here by the filter housing 12 and by the flow body 24.
  • the outer space 32 is connected to an outlet channel 34, which opens into an outlet opening 36 of the filter housing 12.
  • a disc-shaped cleaning punch 38 In the interior 22 of the flow body 24 is a disc-shaped cleaning punch 38.
  • the cleaning punch 38 is connected to a first side 39 with a flushing piston 40.
  • the rinsing piston 40 extends substantially axially relative to the cylindrical hollow body 26, ie also parallel to the perforated filter support wall 28.
  • the cleaning ram 38 has the form of a permeable wheel 42 with spokes 44.
  • Peripheral side 46 of the cleaning ram 38 is in radial contact with the flow body 24 Spokes 44 are crossed with spoke channels 48.
  • a groove 50 On the peripheral side 46 of the cleaning ram 38, a groove 50 is provided.
  • the spoke channels 48 of the spokes 44 of the cleaning ram 38 are connected to the channel 50 with their 30 channel openings 52.
  • a longitudinal channel 54 is provided axially, which is also connected to the spoke channels 48.
  • the flushing piston 40 extends through a central housing cover opening 56.
  • the channel 54 of the flushing piston 40 is connected to the outer housing environment 58.
  • a drive piston 62 is provided on a second side 60 of the cleaning punch 38.
  • the drive piston 62 is a part of a drive mechanism 64.
  • the drive mechanism 64 for example, from an electric drive with a Worm gear or a hydraulic drive can be made, the drive piston 62 is actively pushed or pulled axially to the cylindrical hollow body 26. Accordingly, the disk-shaped cleaning punch 38 moves through the interior 22 of the flow body 24 for cleaning.
  • the drive piston 62 is guided through a suitable sealed opening 66 of the filter housing 12.
  • the cleaning punch 38 is in a rest position 68.
  • the surface of the perforated filter support wall 28 can be fully utilized in the rest position 68 to clean the fluid flowing through the flow body 24 because the cleaning punch 38 does not form a portion of the perforated filter support wall 28 covers.
  • the cylindrical perforated plate 30 is additionally provided around the flow body 24.
  • the filter element 31 is located between the cylindrical perforated plate 30 and the perforated filter support wall 28.
  • the filter assembly 10 for a fluid according to FIG. 1 is also shown in longitudinal section.
  • the cleaning punch 38 is in operation.
  • the drive piston 62 has pushed the cleaning punch 38 into an operating region 70 of the interior 22 of the cylindrical hollow body 26 along a longitudinal axis 71.
  • deposits are released from the perforated filter support wall 28.
  • the openings 29 of the perforated filter support wall 28 in the region 70 lie on the groove 50 of the peripheral side 46 of the cleaning ram 38. Since a higher pressure prevails in the outer space 32 than in the environment, the deposits on the other hand from the perforated filter support wall 28 " in the channel 50th The deposits are then discharged from the channel 50 through the spoke channels 48 and the longitudinal channel 54 of the scavenge piston 40 to the outer housing environment 58. The contact between the peripheral side 46 and the perforated filter support wall 28 is sealed The openings 29 are arranged annularly around the cylindrical hollow body 26, so that a sealing area 72 can always arise.
  • FIG. 3 shows an exemplary embodiment of a filter arrangement 110 according to the invention.
  • the filter assembly 110 is shown as the previous figures in a schematic longitudinal section.
  • the filter assembly 110 has a filter housing 112.
  • a piston 114 is provided in a piston guide 116.
  • the piston 114 has at its one end a stop 115.
  • the piston guide 116 terminates in a form-fitting manner with the piston 114.
  • an inlet opening 118 with an inlet channel 120 and an outlet opening 122 with an outlet channel 124 are provided in the filter housing 112.
  • the inlet channel 120 opens into a cylindrical cavity 126 of the piston 114th
  • a changeable flow body 132 is arranged in a wall 130 of the piston 114. While the piston 114 is provided with the piston guide 116 in a form-fitting manner, the flow body 132 is at a distance from the filter housing 112 or the piston guide 116. The spacing results in an outer space 133 to the Dürchmann Ari 132.
  • the outlet channel 124 is connected to the outer space 133 of the flow body 132.
  • the flow body 132 forms a cylindrical hollow body 134, the interior 136 of which is in communication with the cavity 126 of the piston 114.
  • the cylindrical hollow body 134 is formed by a secured filter support wall 138.
  • the filter support wall 138 is disposed in the portion 128 of the piston 114.
  • a cylindrical perforated plate 140 surrounds the flow body 132. Between the filter support wall 138 and the cylindrical perforated plate 140, a filter element 142 is provided.
  • the filter element preferably consists of a sieve whose mesh size can be adapted to the contamination of the fluid.
  • the cavity 126 of the piston 114 is closed with a cover cover 144.
  • the end cover 144 is inserted into the piston 114 in a form-fitting manner.
  • the end cover 144 has a largely central passage opening 146, through which a rinsing piston 148 of a cleaning ram 150 is guided.
  • the cleaning punch 150 has the form of a permeable wheel 152 with spokes 154. In principle, other shapes are conceivable in place of the wheel 152, such as a rectangular or an oval shape.
  • the flushing piston 148 is disposed perpendicularly and axially to the permeable wheel 152.
  • a longitudinal passage 156 is provided axially, which is also connected to spoke channels 160.
  • Peripheral side 158 of the cleaning punch 150 is in radial contact with the flow body 132.
  • the spokes 154 are crossed with spoke channels 160.
  • a groove 162 is provided on the peripheral side 158 of the cleaning punch 150.
  • the spoke channels 160 of the spokes 154 of the cleaning punch 150 are connected to the channel 162 with their channel openings 164.
  • the longitudinal channel 156 of the flushing piston 148 is connected to the outer environment 166 of the filter housing 112.
  • the cleaning punch 150 is in a rest position 168.
  • the surface of the perforated filter support wall 138 can be fully utilized in the rest position 168 for cleaning the fluid flowing through the flow body 132.
  • the mode of operation of the cleaning punch 150 can be seen analogously to FIGS. 1 and 2 already described. Accordingly moves in this embodiment of the Cleaning punch 150 for cleaning, as shown in Figures 4 and 5, along a longitudinal axis 169.
  • Fig. 4 an operating state of the cleaning punch 150 is shown.
  • Fig. 5 the final state of the cleaning punch 150 is shown after a cleaning pass.
  • the cleaning punch 150 moves during the ongoing operation of the machine, for example, for the processing of liquid plastic, along the longitudinal axis 169 of the flow body 132 to the end position shown in FIG. In doing so, the cleaning punch 150 removes adhering contaminants.
  • FIG. 6 the filter assembly 110 according to the invention is shown, in which the piston 114 is inserted via the piston guide 116 into the filter housing 112 to the stop 115. In this position, the stop 115 opposite piston end 170 of the piston 114 projects out of the filter housing 112. In this piston end 170 of the flow body 132 is located. The flow body 132 is now accessible from the outside. The cleaning punch 150 is pushed to the position of the final state as shown in FIG. 5.
  • the piston 114 In this position, the piston 114 is in a change position 172 for the flow body 132. In this change position 172, the filter elements 142, the filter support wall 138 and the cylindrical perforated plate 140 can be cleaned or replaced if necessary.
  • the piston 114 closes in this change position 172 the inlet channel 120 and the outlet channel 124.
  • a drive is provided to move the piston 114 and the cleaning punch 150. In each case, a separate drive or a common drive can be provided.
  • FIG. 7 schematically shows the cross section of the filter arrangement 110 according to the invention.
  • two parallel pistons 114 are arranged with two flow bodies 132.
  • the cleaning punches 150 are shown accordingly.
  • Fig. 7 corresponds to Figures 3 to 6, the same reference numerals are used here.
  • the pistons 114 can be moved asynchronously in their piston guides 116.
  • the change of the flow body 132 and the filter elements 142 take place alternately. This has the consequence that the machine for changing the flow body 132 or the filter elements 142 or other parts of the filter assembly 110 does not have to be issued. In each case, the other flow body 132 takes over the corresponding filter function in the moment of change.
  • the cleaning punches 150 can also be operated asynchronously.
  • the fluid which is indicated by arrows 174, flows through the inlet opening 118 into the inlet channels 120.
  • Each flow body 132 is assigned a separate inlet channel 120. After the fluid has flowed through the flow body 132, as described above, for filtering, it finally reaches the outlet channels 124. Via the outlet channels 124, the fluid is supplied to the outlet opening 122 for further processing in the machine. By axially displacing the piston 114, the associated inlet channel 120 and the associated outlet channel 124 are blocked respectively.
  • the flow body 132 can be serviced or changed.
  • the filtering function is then performed by the parallel flow body 132, which is preferably in an operating position.
  • FIG. 8a in a schematic longitudinal section a further variant of a filter arrangement 210 according to the invention is shown.
  • FIG. 8 a and the following FIGS. 8 b to 8 d essentially differ from the previous exemplary embodiments in the shape of the flow body 238.
  • FIGS. 8 a to 8 d show the different working positions of the filter arrangement 210.
  • the filter assembly 210 has a filter housing 212.
  • a piston 214 is provided in a piston guide 216.
  • the piston 214 has a stop 218 at one end.
  • the piston guide 216 closes positively with the piston 214.
  • an inlet opening 220 with an inlet channel 222 and an outlet opening 224 with an outlet channel 226 are provided in the filter housing 212.
  • the inlet channel 220 opens into a cavity 228 of the piston 214.
  • a curved filter element 230 is shown. In this case, the piston 214 is in a first position in the rest position 232.
  • a removable flow body 238 is arranged in a wall 236 of the piston 214. While the piston 214 is provided with the piston guide 216 in a form-fitting manner, the flow body 238 is at a distance from the filter housing 212 or the piston guide 216. The spacing creates a rear space 240 to the flow body 238. The exit passage 226 is connected to the rear space. 240 of the flow body 238 connected.
  • the flow body 238 is disposed in the portion 234 of the piston 214.
  • a filter support wall 248 forms with a perforated plate 250 the flow body 238.
  • a filter element 252 is provided between the perforated plate 250 and the filter support wall 248, a filter element 252 is provided.
  • the filter element 252 preferably consists of a sieve whose mesh size can be adapted to the contamination of the fluid.
  • the flow body 238 has in the longitudinal section substantially the shape of two opposite trapezoids 254a and 254b.
  • the flow body 238 is replaced by a bulbous shape.
  • Both the perforated plate 250 and the filter element 252 therefore also have, in longitudinal section, essentially a shape of the two opposite trapezoids 254a and 254b, which are arranged along their longer side parallel to the longitudinal axis 256 of the piston 214.
  • trapezoids 254a, 254b may also be provided a concave or other curvy shape.
  • the shape of the flow body 238 or the perforated plate 250 and the filter element 252 has an influence on the flow of the fluid 174.
  • the adaptation option of the shapes for the filter element 252 or the perforated plate 250 can optimize various parameters of the flow, for example with respect to the flow direction, flow velocity and flow rate Viscosity of the substance to be filtered, etc. are made.
  • an individual optimization and adaptation of the flow body 238 can be carried out.
  • the cavity 246 of the piston 214 is closed with a cover plate 258.
  • the end cap 258 is recessed into the piston 214 in a form-fitting manner.
  • the end cover 258 has a largely central passage opening 260, through which a flushing piston 262 of a cleaning punch 264 is guided.
  • the cleaning punch 264 is in the form of two opposing jaws 266.
  • the flushing piston 262 is disposed perpendicularly and axially to the jaws 266.
  • a longitudinal channel 270 is provided axially, which is also connected to spoke channels 272.
  • the longitudinal channel 270 of the flushing piston 262 is connected to the external environment 280 of the filter housing 212.
  • the cleaning punch 264 is in a rest position 232.
  • the surface of the perforated filter support wall 248 can be fully utilized in the rest position 232 for cleaning the fluid flowing through the flow body 238.
  • the operation of the cleaning punch 264 is analogous to the previously described figures. Accordingly, in this embodiment too, the cleaning punch 264 moves along the longitudinal axis 256 for cleaning.
  • FIG. 8b an operating state of the cleaning punch 264 is shown.
  • the cleaning punch is located in a working position 282, in which the filter element 230 as described above, is cleaned.
  • FIG. 8c shows an end position 284 of the cleaning punch 264 after a cleaning cycle.
  • the cleaning punch 264 passes from the rest position 232 according to FIG. 8a during operation of the machine, for example for processing liquid plastic, along the longitudinal axis 256 through the flow body 238 up to the end position 284 according to FIG. 8c. It removes the Cleaning stamp 264 adhering contaminants.
  • Fig. 8d the filter assembly 210 according to the invention is shown, in which the piston 214 is inserted via the piston guide 216 in the filter housing 212 to the stop 218. In this position, the stop 218 opposite piston end 286 of the piston 214 projects out of the filter housing 212. In this piston end 286 of the flow body 238. The flow body 238 is now accessible from the outside. The cleaning punch 264 is pushed to the position of the final state, as shown in Fig. 8c.
  • the piston 214 In this position, the piston 214 is in a change position 288 for the flow body 238. In this change position 288, the filter elements 252, the filter support wall 248 and the perforated plate 250 can be cleaned or replaced if necessary.
  • the piston 214 closes in this change position 288 the inlet channel 222 and the outlet channel 226.
  • a drive is provided to move the piston 214 and the cleaning punch 264. In each case, a separate drive or a common drive can be provided.
  • FIG. 9a shows a further exemplary embodiment of a filter arrangement 290 according to the invention in a schematic longitudinal section.
  • a filter housing 292 In a filter housing 292 is a piston 294 which is slidably disposed in a piston guide 295 of the filter housing 292.
  • a single flat flow body 296 is provided in a portion 293 of the piston 294.
  • the flow body 24 or 132 forms a hollow body 26, 134.
  • the flow body 296 is arranged in the portion 293 of the piston 294 in its wall 297.
  • FIGS. 9a to 9d show the different operating positions of the filter arrangement 290.
  • the inlet passage 300 leads the fluid 174 into an antechamber 302.
  • the flow body 296 contains a filter element 304, a filter support wall 306 and a perforated plate 308, which are planar.
  • the conical-shaped rear space 310 is located in the piston 294 and ends in an outlet channel 312.
  • the outlet channel 312 terminates in an outlet opening 314 of the filter housing 292.
  • the flow body 296 is changeably arranged in the piston 294. While the piston 294 is provided with a positive fit with the piston guide 295, the flow body 296 is spaced from the filter housing 292 and the piston guide 295. As a result of the spacing, in particular the antechamber 302 to the flow body 296 is formed.
  • a cleaning punch 316 In the vestibule 302 is a cleaning punch 316.
  • the cleaning punch 316 has a ladder-like shape, the rungs 318 are crossed with channels 320.
  • a flushing piston 322 is arranged substantially centrally, perpendicularly and axially to the cleaning punch 316.
  • a longitudinal channel 324 is provided axially, which is connected to the channels 320.
  • the channels 320 of the rungs 318 of the cleaning punch 316 are connected with their channel openings 278 with a groove 326.
  • the longitudinal channel 324 of the flushing piston 322 is connected to the outer environment 328 of the filter housing 292.
  • the cleaning punch 316 is in a rest position 327.
  • the surface of the filter element 304 can be fully utilized in the rest position 327 for cleaning the fluid flowing through the flow body 296.
  • the operation of the cleaning punch 316 is analogous to the previously described figures. Accordingly, in this embodiment as well, the cleaning punch 316 moves along a longitudinal axis 330 for cleaning.
  • FIG. 9b shows, in a schematic longitudinal section, the filter arrangement 290 according to the invention with the conical outer space 310 in a second position of the cleaning punch 316 in such a working position 332.
  • the cleaning punch 316 is guided along the flow body 296 analogously, as in the previous exemplary embodiments. In this case, contamination is conveyed by negative pressure through the longitudinal channel 324 of the flushing piston 322 to the outside.
  • FIG. 9c an end position 334 of the cleaning punch 316 is shown after a cleaning pass. From the rest position 327 of the cleaning punch 316, the latter drives according to FIG. 9b during operation over the surface of the flow body 296 up to the end position 334 according to FIG. 9c.
  • the cleaning punch 316 removes adhering contaminants.
  • the filter assembly 290 is shown, in which the piston 294 is inserted via the piston guide 295 in the filter housing 292 up to a stop 336 of the piston 294. In this position, the stop 336 opposite piston end 338 of the piston 294 protrudes from the filter housing 292 out. In this piston end 338 of the flow body 296 is arranged. From the outside, the flow body 296 is accessible for a change.
  • the cleaning punch 264 is pushed to the position of the final state, as shown in Fig. 9c. In this position, the piston 294 is in a change position 340 for the flow body 296. In this change position 340, the filter elements 304, the filter support wall 306 and the orifice plate 308 can be cleaned or replaced if necessary.
  • the piston 294 closes in this change position 340 the inlet channel 300 and the outlet channel 312nd
  • FIG. 10 shows in a schematic cross section the filter arrangement 210 according to the invention according to FIGS. 8a to 8d.
  • the piston 214 is disposed in the piston guide 216.
  • the piston guide 216 closes positively with the piston 214.
  • the cavity 228 of the piston 214 forms the antechamber 244 and is connected to the not visible here inlet channel 222.
  • the rear space 240 is provided outside the flow body 238 and is formed by the piston guide 216 and the flow body 238.
  • the rear space 240 is connected to the outlet channel 226 and the outlet opening 224, not visible here, in conjunction.
  • the exchangeable flow body 238 is inserted in a form-fitting manner in the wall 236 of the piston 214.
  • the filter support wall 248 forms with the perforated plate 250, the flow body 238.
  • the filter element 252 is provided between the perforated plate 250 and the filter support wall 248, the filter element 252 is provided.
  • the filter element 252 preferably consists of a sieve whose mesh size can be adapted to the contamination of the fluid.
  • the cleaning punch 264 is in the form of two opposing jaws 266.
  • the flushing piston 262 is disposed perpendicularly and axially to the jaws 266.
  • a longitudinal channel 270 is provided axially, which is also connected to spoke channels 272.
  • FIG. 11 shows in a schematic cross section the filter arrangement 290 according to the invention according to FIGS. 9a to 9d. As far as Fig. 11 corresponds to Figs. 9a to 9d, the same reference numerals are used.
  • the piston 294 which is arranged displaceably in the piston guide 295 of the filter housing 292.
  • the flow body 296 is provided in the section 293 of the piston 294.
  • the flow body 296 is embedded in the portion 293 of the piston 294 in the wall 297.
  • the inlet channel 300 leads the fluid 174 into an antechamber 302.
  • the flow body 296 comprises the filter element 304, the filter support wall 306 and the perforated plate 308. As soon as the fluid 174 reaches the flow body 296 flows through, it flows into the cone-shaped rear space 310.
  • the conical-shaped rear space 310 is located in the piston 294 and communicates with the Outlet passage 312 and the outlet opening 314 of the filter housing 292 in conjunction.
  • the flow body 296 is changeably arranged in the piston 294 as described. While the piston 294 is provided with a positive fit with the piston guide 295, the flow body 296 is spaced from the filter housing 292 and the piston guide 295. As a result of the spacing, in particular the antechamber 302 to the flow body 296 is formed.
  • the cleaning punch 316 has a "ladder-like" shape whose rungs 318 are traversed by the channels 320.
  • the rinsing piston 322 is arranged substantially centrally, perpendicularly and axially to the cleaning ram 316
  • a longitudinal channel 324 is provided axially, which is connected to the channels 320.
  • the channels 320 of the rungs 318 of the cleaning punch 316 are connected to their channel openings 278.
  • the longitudinal channel 324 of the flushing piston 322 is connected to the outer environment 328 of the filter housing 292.

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Abstract

L'invention concerne un dispositif filtrant (10, 110) pour un fluide (174) comprenant un boîtier de filtre (12, 112), le boîtier de filtre (12, 112) comportant une ouverture d'entrée (18, 118) pour un canal d'entrée (20, 120) et une ouverture de sortie (36, 122) pour un canal de sortie (34, 124). Ledit boîtier de filtre (12, 112) est pourvu d'un corps à circulation traversante (24, 132). Ledit corps à circulation traversante (24, 132) comporte une paroi de support du filtre (28, 138), ce qui entraîne la formation d'un corps creux (26, 134), doté d'un espace intérieur (22, 136) et d'un espace extérieur (32). Ledit espace intérieur (22, 136) est couplé au canal d'entrée (20, 120) et ledit espace extérieur (32) est couplé au canal de sortie (34, 124). Ladite paroi de support du filtre (28, 138) est pourvue d'ouvertures (29), à travers lesquelles le fluide (174) est conduit pour être filtré. Selon l'invention, ledit dispositif filtrant est pourvu d'un tampon de nettoyage (38, 150) coulissant, lequel enlève des dépôts sur la paroi de support du filtre (28, 138).
PCT/EP2018/000151 2017-04-05 2018-04-03 Dispositif filtrant pour un fluide WO2018184722A1 (fr)

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DE102017107304.3 2017-04-05

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