DE202017007054U1 - Filter arrangement for fluid - Google Patents

Abstract

A filter assembly (10, 110) for a fluid (174) having a filter housing (12, 112), wherein
a) the filter housing (12, 112) contains an inlet opening (18, 118) for an inlet channel (20, 120) and an outlet opening (36, 122) for an outlet channel (34, 124),
b) a flow body (24, 132) is provided in the filter housing (12, 112),
c) the flow body (24, 132) has a filter support wall (28, 138), whereby a hollow body (26, 134) with an interior (22, 136) and an outer space (32) is formed,
d) the interior space (22, 136) is coupled to the inlet channel (20, 120) and the exterior space (32) is connected to the outlet channel (34, 124),
e) in the filter support wall (28, 138) openings (29) are provided through which the fluid (174) is passed for filtering,
f) a displaceable cleaning punch (38, 150) is provided which removes deposits on the filter support wall (28, 138),
characterized in that
g) the flow body (24, 132) in a portion (128) of a piston (114) is provided, wherein the piston (114) in the filter housing to a stop (115) in a piston guide (116) is displaceable, so that the flow body (24, 132) for changing out of the filter housing (12, 112) is guided.

Description

Technical area

1. a) das Filtergehäuse eine Eintrittsöffnung für einen Eintrittskanal und eine Austrittsöffnung für einen Austrittskanal enthält,
2. b) ein Durchflusskörper in dem Filtergehäuse vorgesehen ist,
3. c) der Durchflusskörper eine Filterstützwand aufweist, wodurch ein Hohlkörper mit einem Innenraum und einem Außenraum entsteht,
4. d) der Innenraum mit dem Eintrittskanal und der Außenraum mit dem Austrittskanal gekoppelt ist,
5. e) in der Filterstützwand Öffnungen vorgesehen sind, durch die das Fluid zum Filtern geleitet wird,
6. f) ein verschiebbarer Reinigungsstempel vorgesehen ist, welcher Ablagerungen an der Filterstützwand entfernt.

The invention relates to a filter arrangement for a fluid with a filter housing, wherein

1. a) the filter housing contains an inlet opening for an inlet channel and an outlet opening for an outlet channel,
2. b) a flow body is provided in the filter housing,
3. c) the flow body has a filter support wall, whereby a hollow body is formed with an interior space and an exterior space,
4. d) the interior is coupled to the inlet channel and the exterior is coupled to the outlet channel,
5. e) in the filter support wall openings are provided through which the fluid is passed for filtering,
6. f) a slidable cleaning punch is provided which removes deposits on the filter support wall.

Furthermore, the invention relates to a filter arrangement for a fluid according to the preamble of independent patent claim 18.

description

Such filter arrangements are used in plastics processing. In plastics processing plants, 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. For example, 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 raw materials usually with dirt particles. These dirt particles must be kept out of the plastic processing plants. For this purpose, 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 is further processed in the plastics processing plant.

In order to obtain a uniform processing process, as constant a processing pressure as possible is required. In the filter arrangements, the screen filters must be regularly replaced or cleaned. For this purpose, various changing devices are used. The currently used screen change systems include the piston screen changers, the screen filters, the belt screen changers, the rotary screen changers and the flat gate valves. The screen changing systems usually operate automatically, i. mechanically or hydraulically driven. However, there are also manual Siebwechselsysteme in use.

State of the art

The DE 20 2010 017 247 U1 describes a device for filtering a fluid, in particular for filtering a thermoplastic polymer melt. The filtration device 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.

From the DE 10 2006 040 703 A1 is an arrangement for filtering a fluid, in particular a liquefied plastic with a housing of a screen changer, known. The housing contains a supply channel and a discharge channel. In the flow path of the fluid while a transversely displaceably mounted to the flow direction filter holder and at least one filter element is arranged in a corresponding screen space, which is brought into communication with the supply channel and the discharge channel. The by material removal The pressure drop or volume shrinkage occurring in the process is sensitively compensated for by achieving a constant pressure and volume constancy at the discharge channel.

The DE 10 2012 100 641 A1 discloses a filtration apparatus for large area filtration of plastic melts. 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.

In the DE 20 2012 005 261 U1 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. In the bore 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.

The DE 20 2013 003 829 U1 also discloses a filter device for filtering fluid with a housing in which a portafilter is provided with a Siebkavität. The Siebkavität has a dirty side and a clean side. In the Siebkavität 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 Siebkavität to the drain opening. When viewed in a sectional view of the filter device, 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. In this case, the supply channel and the discharge channel extend accordingly in the portafilter.

From the DE 20 2014 001 675 U1 Furthermore, a device for filtering a plastic melt with a housing is known, 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.

The DE 10 2014 009 666 A1 discloses a melt filter assembly having 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.

From the DE 10 2013 216 973 A1 is a melt filter with a sieve insert receiving, rotatable sieve disc known. 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 simplifies. For this purpose, the piston is in operative connection with the drive device. About the drive device is a backwash and / or flooding driven.

The DE 20 2013 101 994 U1 discloses a filter assembly for fluids, in particular plasticized plastic masses, which has a filter receptacle with a filter chamber and a releasably held therein filter. The filter comprises a removable and fixable in the filter chamber filter carrier with a filter element.

From the EP 1 519 823 B1 . EP 1 697 018 B1 . WO 2008/031127 A1 and AT 503 788 A4 Filtering devices for plasticized plastic materials are known which have a rotationally driven filter with a disc or cylindrical filter element and a device for removing filter residues with a likewise rotationally driven discharge device. The DE 44 06 549 A1 shows a method and apparatus for cleaning polymeric plastics, wherein the filter element is formed as a one-piece and sintered hollow cylinder which is mounted on a screw and loosely inserted into a filter chamber, wherein its axial position is secured by shoulders on screw-housing parts.

The DE 10 2010 055 167 A1 relates to an apparatus for the continuous filtering of material mixtures, in particular for the separation of impurities from plastic melts, with a filter rotatably arranged in a filter chamber of a housing. A scraper lifts off the contaminants retained by the filter. Finally, a discharge device transports the contaminants lifted off the filter by the wiper from the housing. The discharge device includes a rotatably mounted in the housing discharge shaft, which has a through opening with a displaceable in this transversely to the axis of rotation of the discharge shaft guided piston.

The DE 26 29 151 A1 relates to a filter apparatus, and more particularly to a backwash filter apparatus in which most of the filter media is operational and filtered while the remaining filter media are cleaned or rinsed in place. 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 must be changed frequently. 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.

Disclosure of the invention

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.

According to the invention 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, 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 from the interior of the Flow body to get into the outer space. Particles of a certain diameter will stick to the filter support wall as a deposit. From the outer space, 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. In a portion of the piston, the flow body is provided, for example in the wall thereof. As soon as the piston is pushed out of the filter housing to replace the filtering flow body, 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. By using at least two flow bodies, the degree of contamination of the filter support wall is reduced by at least half. Replacement is therefore not required so quickly and the running time of the machine can be increased accordingly.

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. By this measure, the flow body can be replaced alternately. As a result, 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. In order not to carry out unnecessary cleaning processes with the cleaning punch, 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. It 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.

As an advantageous embodiment of the filter arrangement according to the invention for a fluid has been found, when the hollow body is substantially cylindrical. With a rotationally symmetrical hollow body, 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.

An advantageous aspect of the invention now also results from the fact that 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.

Preferably, the channel system is connected to the external environment of the filter housing. The deposits thus reach the outside during the cleaning process.

Another preferred embodiment of the filter arrangement for a fluid is that a drive mechanism is provided for the cleaning punch, which guides the cleaning punch along the filter support wall. 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. Appropriately, in one embodiment of the invention, the outlet opening is connected to the outside space. Thus, the filtered fluid can be routed out of the filter housing for further processing.

Furthermore, 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. This is solved by 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. By means of the pressure, 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.

In a particularly advantageous embodiment of the filter arrangement according to the invention for a fluid, a filter element in the outer space is arranged on the filter support wall of the hollow body. Preferably, for this purpose, 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 due to pressure differences between the exterior and the Gutter, which communicates, for example, with the outside environment of the filter housing, achieved.

In order to give the filter element sufficient support on the filter support wall, in a preferred embodiment of the invention, 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.

Alternatively or in combination 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. In order to optimize in particular the flow and filter conditions further exists 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.

Accordingly, for the optimization of the back space behind the passage body for the flow conditions of relevance. An embodiment of the filter arrangement according to the invention also results from the fact that the rear space has a concave, trapezoidal or other curved or curved shape in longitudinal section with respect to a longitudinal axis.

Further embodiments and advantages will become apparent from the subject of the dependent claims and the drawings with the accompanying descriptions. Embodiments are explained below with reference to the accompanying drawings. The invention should not be limited to the embodiments. Rather, embodiments are also considered, which now and in the future in an equivalent manner to the skilled person with other technical aids.

list of figures

• 1 shows in a longitudinal section a filter arrangement according to the invention for a fluid in which the cleaning punch is arranged in a rest position.
• 2 shows in a longitudinal section according to 1 a filter arrangement according to the invention for a fluid, wherein the cleaning punch is shown in an operating position.
• 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.
• 4 shows in a schematic longitudinal section according to 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, wherein the cleaning punch is shown in an operating position.
• 5 shows in a schematic longitudinal section according to the 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, wherein the cleaning punch is shown in a cleaning end position.
• 6 shows in a schematic longitudinal section according to the 3-5 a filter arrangement according to the invention for a fluid, wherein the piston is provided in a change position in the filter housing for changing the flow body, wherein the cleaning punch is shown in the final cleaning position.
• 7 shows a schematic cross-section of the filter assembly according to the invention, in which the filter housing with two pistons, two Durchflußkörpem, and arranged in the flow bodies cleaning punches is shown.
• 8a shows a schematic longitudinal section of the filter assembly according to the invention with a curved filter element in a first position of the cleaning ram in the rest position.
• 8b shows a schematic longitudinal section of the filter assembly according to the invention with a curved filter element in a second position of the cleaning punch in working position.
• 8c shows a schematic longitudinal section of the filter assembly according to the invention with a curved filter element in one third position of the cleaning punch in an end position.
• 8d shows a schematic longitudinal section of the filter assembly according to the invention with a curved filter element in a fourth position of the cleaning punch in a Siebwechselstellung in which the piston is led out of the filter housing.
• 9a shows a schematic longitudinal section of the filter assembly according to the invention with a conical outer space in a first position of the cleaning ram in the rest position.
• 9b shows a schematic longitudinal section of the filter assembly according to the invention with a conical outer space in a second position of the cleaning punch in working position.
• 9c shows a schematic longitudinal section of the filter assembly according to the invention with a conical outer space in a third position of the cleaning punch in an end position.
• 9d shows a schematic longitudinal section of the filter assembly according to the invention with a conical outer space in a fourth position of the cleaning punch in a Siebwechselstellung in which the piston is led out of the filter housing.
• 10 shows in a schematic cross section the filter arrangement according to the invention according to the 8a to 8d ,
• 11 shows in a schematic cross section the filter arrangement according to the invention according to the 9a to 9d ,

Preferred embodiment

In 1 10 denotes a filter arrangement according to the invention for a fluid, such as liquid plastic. The filter arrangement 10 is shown in a longitudinal section. The filter arrangement 10 includes a filter housing 12 which is on its front 14 with a housing cover 16 is closed. The housing cover 16 can be removed from the filter housing 12 remove. The filter housing 12 has an inlet opening 18 on, to which an entrance channel 20 followed. The entrance channel 20 flows into an interior 22 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 from a perforated filter support wall 28 educated. openings 29 the sieve-shaped filter support wall 28 can be adapted in their diameter to the material to be processed. This can be done by suitable choice of the flow body 24 or the filter support wall 28 respectively. A cylindrical perforated plate 30 surrounds the flow body 24 , Between the filter support wall 28 and the cylindrical perforated plate 30 is a filter element 31 intended. The filter element 31 consists in the present embodiment of a sieve, which can be varied in mesh size as needed.

Through the entrance channel 20 the fluid gets into the interior 22 of the flow body 24 pressed. By the pressure with which the fluid enters the cylindrical hollow body 26 Finally, the fluid passes through the perforated filter support wall 28 in an outdoor space 32 which is outside the flow body 24 located. The outdoor space 32 is here through the filter housing 12 and through the flow body 24 Are defined. The outdoor space 32 is with an exhaust duct 34 connected, which in an outlet opening 36 of the filter housing 12 empties.

In the interior 22 of the flow body 24 there is a disc-shaped cleaning stamp 38 , The cleaning stamp 38 is on a first page 39 with a rinsing piston 40 connected. The rinsing piston 40 runs substantially axially to the cylindrical hollow body 26 , so also parallel to the perforated filter support wall 28 , The cleaning stamp 38 has the form of a permeable wheel 42 with spokes 44 , peripheral side 46 of cleaning stamp 38 is in radial contact with the flow body 24 , The spokes 44 are with spoke channels 48 traversed. On the peripheral side 46 of cleaning stamp 38 is a groove 50 intended. The spoke channels 48 the spokes 44 of cleaning stamp 38 are with their canal openings 52 with the gutter 50 connected. In the rinsing flask 40 is axially a longitudinal channel 54 provided, also with the spoke channels 48 connected is.

The rinsing piston 40 passes through a central housing cover opening 56 , The channel 54 of the flushing piston 40 is with the outer housing environment 58 connected. Opposite the flushing piston 40 is on a second page 60 of cleaning stamp 38 a drive piston 62 intended. The drive piston 62 is part of a drive mechanism 64 , About the drive mechanism 64 , which may consist of an electric drive with a worm gear or a hydraulic drive, for example, is the drive piston 62 active axially to the cylindrical hollow body 26 pushed or pulled. Accordingly, the disc-shaped cleaning punch moves 38 for cleaning through the interior 22 of the flow body 24 ,

The drive piston 62 is through a suitable sealed opening 66 of the filter housing 12 guided. In the present illustration of the 1 is the cleaning stamp 38 in a resting position 68 , The area of the perforated filter support wall 28 can be in the resting position 68 completely for the cleaning of the through the flow body 24 flowing fluid can be exploited, since the cleaning punch 38 no section of the perforated filter support wall 28 covers. The cylindrical perforated plate 30 is in addition to the flow body 24 intended. The filter element 31 is located between the cylindrical perforated plate 30 and the perforated filter support wall 28 ,

In 2 becomes the filter assembly 10 for a fluid according to 1 also shown in longitudinal section. In contrast to 1 is at 2 the cleaning stamp 38 in operation. As far as correspond to the two figures, therefore, the same reference numerals are used. The drive piston 62 has the cleaning stamp 38 into an operating area 70 of the interior 22 of the cylindrical hollow body 26 along a longitudinal axis 71 pushed. By pushing or pulling the cleaning punch 38 On the one hand, deposits detach from the perforated filter support wall 28 ,

The openings 29 the perforated filter support wall 28 in the area 70 lie on the gutter 50 the peripheral side 46 of cleaning stamp 38 , There in the outside space 32 on the other hand, the deposits are on the other hand from the perforated filter support wall 28 into the gutter 50 the peripheral side 46 of cleaning stamp 38 pressed or backwashed. The deposits are then removed from the gutter 50 through the spoke channels 48 and the longitudinal channel 54 of the flushing piston 40 to the outer housing environment 58 issued. The contact between the peripheral side 46 and the perforated filter support wall 28 is tightly closed. The openings 29 are annular around the cylindrical hollow body 26 arranged so that always a sealing area 72 can arise.

In 3 is an embodiment of a filter arrangement according to the invention 110 shown. The filter arrangement 110 is shown as the previous figures in a schematic longitudinal section. The filter arrangement 110 has a filter housing 112 on. In the filter housing 112 is a piston 114 in a piston guide 116 intended. The piston 114 has a stop at one end 115 on. The piston guide 116 closes with the piston 114 positive locking. In the filter housing 112 are an entrance opening 118 with an entrance channel 120 and an exit opening 122 with an exit channel 124 intended. The entrance channel 120 opens into a cylindrical cavity 126 of the piston 114 ,

In a section 128 is in a wall 130 of the piston 114 a changeable flow body 132 arranged. While the piston 114 positive fit with the piston guide 116 is provided, is the flow body 132 to the filter housing 112 or the piston guide 116 spaced. The spacing creates an outdoor space 133 to the flow body 132 , The exit channel 124 is with the outside space 133 of the flow body 132 connected.

The flow body 132 forms a cylindrical hollow body 134 whose interior 136 with the cavity 126 of the piston 114 communicates. The cylindrical hollow body 134 is from a secured filter support wall 138 educated. The filter support wall 138 is in the section 128 of the piston 114 arranged. A cylindrical perforated plate 140 surrounds the flow body 132 , Between the filter support wall 138 and the cylindrical perforated plate 140 is a filter element 142 intended. 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 comes with a cover 144 locked. This is the end cover 144 in the pistons 114 recessed form fit. The end cover 144 has a largely central passage opening 146 through which a rinsing piston 148 a cleaning stamp 150 is guided. The cleaning stamp 150 has the form of a permeable wheel 152 with spokes 154 , Basically, instead of the wheel 152 Other forms conceivable, such as a rectangular or an oval shape. Essentially central is the flushing piston 148 perpendicular and axial to the permeable wheel 152 arranged. In the rinsing flask 148 is axially a longitudinal channel 156 provided, also with spoke channels 160 connected is. peripheral side 158 of cleaning stamp 150 is in radial contact with the flow body 132 , The spokes 154 are with spoke channels 160 traversed. On the peripheral side 158 of cleaning stamp 150 is a groove 162 intended. The spoke channels 160 the spokes 154 of cleaning stamp 150 are with their canal openings 164 with the gutter 162 connected.

The longitudinal channel 156 of the flushing piston 148 is with the outside environment 166 of the filter housing 112 connected. In the present illustration of the 3 there is the cleaning stamp 150 in a resting position 168 , The area of the perforated filter support wall 138 can be in the resting position 168 completely for the cleaning of the through the flow body 132 be exploited flowing fluid.

The operation of the cleaning stamp 150 is analogous to those already described 1 and 2 to see. Accordingly, the cleaning punch moves in this embodiment as well 150 for cleaning, as in the 4 and 5 is shown along a longitudinal axis 169 , In the 4 becomes an operating state of the cleaning punch 150 shown. In the 5 becomes the final state of the cleaning punch 150 shown after a cleaning run. As far as the 4 and the 5 the 3 are the same reference numerals are used here as well. The cleaning stamp 150 moves along the longitudinal axis during operation of the machine, for example for processing liquid plastic 169 of the flow body 132 up to the end position according to 5 from. The cleaning stamp removed 150 adhering impurities.

Despite the cleaning stamp 150 It often happens that the flow body 132 must be replaced. This is partly because the flow body 132 wears and on the other hand so contaminated that it can no longer be used as intended. In 6 becomes the filter arrangement according to the invention 110 shown in which the piston 114 over the piston guide 116 in the filter housing 112 until the stop 115 is inserted. In this position, that protrudes the stop 115 opposite piston end 170 of the piston 114 out of the filter housing 112 out. In this piston end 170 is the flow body 132 , The flow body 132 is now accessible from the outside. The cleaning stamp 150 is in the position of the final state, as in 5 shown, pushed.

In this position is the piston 114 in a change position 172 for the flow body 132 , In this change position 172 can the filter elements 142 , the filter support wall 138 and the cylindrical perforated plate 140 be cleaned or replaced if necessary. The piston 114 closes in this change position 172 the entrance channel 120 and the exit channel 124 , To move the piston 114 or the cleaning stamp 150 an unillustrated drive is provided. In each case, a separate drive or a common drive can be provided.

In 7 is schematically the cross section of the filter arrangement according to the invention 110 shown. In the filter housing 112 are two parallel pistons 114 with two flow bodies 132 arranged. In the flow bodies 132 are accordingly the cleaning stamp 150 shown. As far as the 7 the 3 to 6 corresponds, the same reference numerals are used here. The pistons 114 can be asynchronous in their piston guides 116 be moved. As a result, for example, the change of the flow body 132 or the filter elements 142 take place alternately. As a result, 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 at the moment of changing the corresponding filter function. Also the cleaning stamp 150 can be operated asynchronously.

The fluid, which with arrows 174 is indicated, flows through the inlet opening 118 in the entrance channels 120 , Every flow body 132 is a separate entrance channel 120 assigned. After the fluid reaches the flow body 132 , as described above, has passed through for filtering, it finally enters the outlet channels 124 , About the exit channels 124 is the fluid of the outlet opening 122 supplied for further processing in the machine. By axial displacement of the piston 114 in each case the associated entry channel 120 or the associated outlet channel 124 blocked. The flow body 132 can be serviced or changed. The filter function is then from the parallel flow body 132 performed, which is preferably in an operating position.

In 8a will be, as in the previous one 5 and 6 , In a schematic longitudinal section, a further variant of a filter arrangement according to the invention 210 shown. The 8a and the following ones 8b to 8d differ from the previous embodiments substantially in the shape of the flow body 238 , The 8a to 8d show the different working positions of the filter assembly 210 ,

The filter arrangement 210 has a filter housing 212 on. In the filter housing 212 is a piston 214 in a piston guide 216 intended. The piston 214 has a stop at one end 218 on. The piston guide 216 closes with the piston 214 positive locking. In the filter housing 212 are an entrance opening 220 with an entrance channel 222 and an exit opening 224 with an exit channel 226 intended. The entrance channel 220 flows into a cavity 228 of the piston 214 , In this embodiment of the filter arrangement 210 is a curved filter element 230 shown. This is the piston 214 in a first position at rest 232 ,

In a section 234 is in a wall 236 of the piston 214 a changeable flow body 238 arranged. While the piston 214 positive fit with the piston guide 216 is provided, is the flow body 238 to the filter housing 212 or the piston guide 216 spaced. The spacing creates a back space 240 to the flow body 238 , The exit channel 226 is with the back room 240 of the flow body 238 connected.

The flow body 238 is in the section 234 of the piston 214 arranged. A filter support wall 248 forms with a perforated plate 250 the flow body 238 , Between the perforated plate 250 and the filter support wall 248 is a filter element 252 intended. 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 longitudinal section essentially the shape of two opposite trapezoids 254a and 254b , The flow body 238 This gives it a bulbous shape. Both the perforated plate 250 , as well as the filter element 252 Therefore, also in longitudinal section have substantially a shape of the two opposite trapezoids 254a and 254b , which along their longer side parallel to the longitudinal axis 256 of the piston 214 are arranged.

Instead of the trapeze 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 , By the adjustment option of the shapes for the filter element 252 or the perforated plate 250 For example, optimizations of various parameters of the flow, for example with regard to the flow direction, flow velocity and viscosity of the substance to be filtered, etc., can be carried out. Here is an individual optimization and adjustment of the flow body 238 make.

The cavity 246 of the piston 214 comes with a cover 258 locked. This is the end cover 258 in the pistons 214 recessed form fit. The end cover 258 has a largely central passage opening 260 through which a rinsing piston 262 a cleaning stamp 264 is guided. The cleaning stamp 264 has the shape of two opposing claws 266 , Essentially central is the flushing piston 262 perpendicular and axial to the claws 266 arranged. In the rinsing flask 262 is axially a longitudinal channel 270 provided, also with spoke channels 272 connected is.

The longitudinal channel 270 of the flushing piston 262 is with the outside environment 280 of the filter housing 212 connected. In the present illustration of the 8a there is the cleaning stamp 264 in a resting position 232 , The area of the perforated filter support wall 248 can be in the resting position 232 completely for the cleaning of the through the flow body 238 be exploited flowing fluid.

The operation of the cleaning stamp 264 is to be seen analogous to the previously described figures. Accordingly, the cleaning punch moves in this embodiment as well 264 for cleaning along the longitudinal axis 256 ,

In the 8b becomes an operating state of the cleaning punch 264 shown. The cleaning stamp is in a working position 282 in which the filter element 230 as described above. In the 8c becomes an end position 284 of cleaning stamp 264 shown after a cleaning run. The cleaning stamp 264 passes through from the rest position 232 according to 8a during operation of the machine, for example for processing liquid plastic, along the longitudinal axis 256 the flow body 238 up to the end position 284 according to 8c , The cleaning stamp removed 264 adhering impurities.

In 8d becomes the filter arrangement according to the invention 210 shown in which the piston 214 over the piston guide 216 in the filter housing 212 until the stop 218 is inserted. In this position, that protrudes the stop 218 opposite piston end 286 of the piston 214 out of the filter housing 212 out. In this piston end 286 is the flow body 238 , The flow body 238 is now accessible from the outside. The cleaning stamp 264 is in the position of the final state, as in 8c shown, pushed.

In this position is the piston 214 in a change position 288 for the flow body 238 , In this change position 288 can the filter elements 252 , the filter support wall 248 and the perforated plate 250 be cleaned or replaced if necessary. The piston 214 closes in this change position 288 the entrance channel 222 and the exit channel 226 , To move the piston 214 or the cleaning stamp 264 an unillustrated drive is provided. In each case, a separate drive or a common drive can be provided.

The 9a shows a further embodiment of a filter arrangement according to the invention 290 in a schematic longitudinal section. In a filter housing 292 there is a piston 294 which is in a piston guide 295 of the filter housing 292 slidably arranged. Unlike the previous embodiments is in a section 293 of the piston 294 just a simple flat flow body 296 intended. The flow body 24 or. 132 namely forms a hollow body in the previous embodiments 26 . 134 , The flow body 296 is in the section 293 of the piston 294 in its wall 297 arranged. The 9a to 9d show the different working positions of the filter assembly 290 ,

Through an entrance opening 298 of the filter housing 292 the fluid passes 174 in the entrance channel 300 , The entrance channel 300 leads the fluid 174 in an anteroom 302 , The flow body 296 contains a filter element 304 , a filter support wall 306 and a perforated plate 308 which are newly formed. Once the fluid 174 the flow body 296 flows through, it flows into a cone-shaped back room 310 , The cone-shaped rear room 310 is in the piston 294 and flows into an exit channel 312 , The exit channel 312 ends in an exit opening 314 of the filter housing 292 ,

The flow body 296 is changeable in the piston 294 arranged. While the piston 294 positive fit with the piston guide 295 is provided, is the flow body 296 to the filter housing 292 or the piston guide 295 spaced. The spacing creates especially the vestibule 302 to the flow body 296 ,

In the anteroom 302 there is a cleaning stamp 316 , The cleaning stamp 316 has a ladder-like shape, its sprouts 318 with channels 320 are traversed. A rinsing piston 322 is essentially central, vertical and axial to the cleaning punch 316 arranged. In the rinsing flask 322 is axially a longitudinal channel 324 provided with the channels 320 connected is. The channels 320 the sprouts 318 of cleaning stamp 316 are with their canal openings 278 with a gutter 326 connected.

The longitudinal channel 324 of the flushing piston 322 is with the outside environment 328 of the filter housing 292 connected. In the present illustration of the 9a there is the cleaning stamp 316 in a rest position 327 , The area of the filter element 304 can be in the resting position 327 completely for the cleaning of the through the flow body 296 be exploited flowing fluid.

The operation of the cleaning stamp 316 is to be seen analogous to the previously described figures. Accordingly, the cleaning punch moves in this embodiment as well 316 for cleaning along a longitudinal axis 330 ,

The 9b shows a schematic longitudinal section of the filter arrangement according to the invention 290 with the cone-shaped exterior 310 in a second position of the cleaning punch 316 in such a working position 332 , The cleaning stamp 316 is analogous, as in the previous embodiments, along the flow body 296 guided. This pollution by negative pressure through the longitudinal channel 324 of the flushing piston 322 transported to the outside.

In the 9c becomes an end position 334 of cleaning stamp 316 shown after a cleaning run. From the rest position 327 of cleaning stamp 316 this drives according to the 9b during operation over the surface of the flow body 296 up to the end position 334 according to 9c , The cleaning stamp removed 316 adhering impurities.

Although the cleaning stamp 264 the flow body 296 Extensively cleans, it may occur that the flow body 296 must be replaced because of wear and extreme contamination or clogging. In 9d becomes the filter assembly 290 shown in which the piston 294 over the piston guide 295 in the filter housing 292 up to a stop 336 of the piston 294 is inserted. In this position, that protrudes the stop 336 opposite piston end 338 of the piston 294 out of the filter housing 292 out. In this piston end 338 is the flow body 296 arranged. From the outside is the flow body 296 accessible for a change. The cleaning stamp 264 is in the position of the final state, as well as in 9c shown, pushed.

In this position is the piston 294 in a change position 340 for the flow body 296 , In this change position 340 can the filter elements 304 , the filter support wall 306 and the perforated plate 308 be cleaned or replaced if necessary. The piston 294 closes in this change position 340 the entrance channel 300 and the exit channel 312 ,

The 10 shows a schematic cross section of the filter arrangement according to the invention 210 according to the 8a to 8d , As far as the 10 with the 8a to 8d covers, same reference numerals are used. In the filter housing 212 is the piston 214 in the piston guide 216 arranged. The piston guide 216 closes with the piston 214 positive locking. The cavity 228 of the piston 214 forms the vestibule 244 and is with the not visible here entrance channel 222 connected. The back room 240 is outside the flow body 238 provided and is by the piston guide 216 and the flow body 238 educated. The back room 240 stands with the outlet channel 226 or the outlet opening 224 , not visible here, in connection.

In a section 234 is in the wall 236 of the piston 214 the exchangeable flow body 238 recessed form fit. The filter support wall 248 forms with the perforated plate 250 the flow body 238 , Between the perforated plate 250 and the filter support wall 248 is the filter element 252 intended. The filter element 252 preferably consists of a sieve, the mesh size of the Contamination of the fluid can be adjusted. The cleaning stamp 264 has the shape of two opposing claws 266 , Essentially central is the flushing piston 262 perpendicular and axial to the claws 266 arranged. In the rinsing flask 262 is axially a longitudinal channel 270 provided, also with spoke channels 272 connected is.

The 11 shows a schematic cross section of the filter arrangement according to the invention 290 according to the 9a to 9d , As far as the 11 the 9a to 9d corresponds, the same reference numerals are used.

In the filter housing 292 is the piston 294 which is in the piston guide 295 of the filter housing 292 slidably arranged. In the section 293 of the piston 294 is the flow body 296 intended. The flow body 296 is in the section 293 of the piston 294 in its wall 297 admitted. Through the entrance opening 298 of the filter housing 292 the fluid passes 174 in the entrance channel 300 , The entrance channel 300 leads the fluid 174 in an anteroom 302 , The flow body 296 includes the filter element 304 , the filter support wall 306 and the perforated plate 308 , Once the fluid 174 the flow body 296 flowed through, it flows into the cone-shaped rear space 310 , The cone-shaped rear room 310 is in the piston 294 and stands with the exit channel 312 or the outlet opening 314 of the filter housing 292 in connection.

The flow body 296 is, as described, changeable in the piston 294 arranged. While the piston 294 positive fit with the piston guide 295 is provided, is the flow body 296 to the filter housing 292 or the piston guide 295 spaced. The spacing creates especially the vestibule 302 to the flow body 296 ,

In the anteroom 302 there is the cleaning stamp 316 , The cleaning stamp 316 has a "ladder-like" shape, its sprouts 318 with the channels 320 are traversed. The rinsing piston 322 is essentially central, vertical and axial to the cleaning punch 316 arranged. In the rinsing flask 322 is axially a longitudinal channel 324 provided with the channels 320 connected is. The channels 320 the sprouts 318 of cleaning stamp 316 are with their canal openings 278 connected. The longitudinal channel 324 of the flushing piston 322 is with the outside environment 328 of the filter housing 292 connected.

LIST OF REFERENCE NUMBERS

10

A filter assembly

12

filter housing

14

front

16

housing cover

18

inlet opening

20

inlet channel

22

inner space

24

Flow body

26

Cylindrical hollow body

28

Holed filter support wall

29

openings

30

Cylindrical perforated plate

31

filter element

32

outer space

34

exhaust port

36

outlet opening

38

cleaning stamp

39

First page of the cleaning stamp

40

scavenge

42

wheel

44

spoke

46

peripheral side

48

spoke channels

50

gutter

52

channel openings

54

Longitudinal channel in the flushing piston

56

Cover opening

58

Outside housing environment

60

Second side of the cleaning stamp

62

drive piston

64

drive mechanism

66

Opening of the filter housing

68

rest position

70

operating range

71

longitudinal axis

72

sealing area

110

A filter assembly

112

filter housing

114

piston

115

attack

116

piston guide

118

inlet opening

120

inlet channel

122

outlet opening

124

outlet channel

126

cavity

128

Section of the piston

130

Wall of the piston

132

Flow body

133

outer space

134

hollow body

136

inner space

138

Filter retaining wall

140

Cylindrical perforated plate

142

filter element

144

End cover

146

Through opening

148

scavenge

150

cleaning stamp

152

Permeable wheel

154

spoke

156

Longitudinal channel in the flushing piston

158

peripheral side

160

spoke channels

162

gutter

164

channel openings

166

Outside environment

168

Rest position of the cleaning punch

169

longitudinal axis

170

piston end

172

Change position of the piston

174

fluid

210

A filter assembly

212

filter housing

214

piston

216

piston guide

218

attack

220

inlet opening

222

inlet channel

224

outlet opening

226

outlet channel

228

Cavity of the piston

230

filter element

232

rest position

234

section

236

Wall of the piston

238

Flow body

240

back room

244

anteroom

246

Cavity of the piston

248

Filter retaining wall

250

perforated plate

252

filter element

254a, 254b

Trapeze

256

longitudinal axis

258

End cover

260

Through opening

262

scavenge

264

cleaning stamp

266

steal

270

longitudinal channel

272

spoke channels

278

channel openings

280

Outside environment

282

Working position of the cleaning punch

284

End position of the cleaning punch

286

piston end

288

change position

290

A filter assembly

292

filter housing

293

section

294

piston

295

piston guide

296

Flow body

297

wall

298

inlet opening

300

inlet channel

302

anteroom

304

filter element

306

Filter retaining wall

308

perforated plate

310

back room

312

outlet channel

314

outlet opening

316

cleaning stamp

318

sprouts

320

channels

322

scavenge

324

longitudinal channel

326

gutter

327

rest position

328

Outside environment

330

longitudinal axis

332

Working position of the cleaning punch

334

End position of the cleaning punch

336

attack

338

piston end

340

change position

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202010017247 U1 [0006]
• DE 102006040703 A1 [0007]
• DE 102012100641 A1 [0008]
• DE 202012005261 U1 [0009]
• DE 202013003829 U1 [0010]
• DE 202014001675 U1 [0011]
• DE 102014009666 A1 [0012]
• DE 102013216973 A1 [0013]
• DE 202013101994 U1 [0014]
• EP 1519823 B1 [0015]
• EP 1697018 B1 [0015]
• WO 2008/031127 A1 [0015]
• AT 503788 A4 [0015]
• DE 4406549 A1 [0015]
• DE 102010055167 A1 [0016]
• DE 2629151 A1 [0017]

Claims (20)

Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112), wherein a) the filter housing (12, 112) has an inlet opening (18, 118) for an inlet channel (20, 120) and an outlet opening (36, 122) for an outlet channel (34, 124), b) a flow body (24, 132) is provided in the filter housing (12, 112), c) the flow body (24, 132) has a filter support wall (28, 138), whereby a hollow body (26, 134) having an inner space (22, 136) and an outer space (32) is formed, d) the inner space (22, 136) with the inlet channel (20, 120) and the outer space (32) with the outlet channel (34, 124) is coupled, e) in the filter support wall (28, 138) openings (29) are provided through which the fluid (174) is passed for filtering, f) a displaceable cleaning punch (38, 150) is provided, which removes deposits on the filter support wall (28, 138), characterized in that g) the flow body (24, 132) in a section t (128) of a piston (114) is provided, wherein the piston (114) in the filter housing to a stop (115) in a piston guide (116) is displaceable, so that the flow body (24, 132) for changing out the filter housing (12, 112) is guided. Filter assembly (10, 110) for a fluid (174) with a filter housing (12, 112) according to Claim 1 characterized in that a first flow body (24, 132) corresponding second flow body (24, 132) in the filter housing (12, 112) in a second piston (114) is arranged, wherein the second piston (114) in the filter housing (12, 112) is displaceable up to a stop (115) in a piston guide (116), so that the second flow body (24, 132) for changing out of the filter housing (12, 112) is guided. Filter assembly (10, 110) for a fluid (174) with a filter housing (12, 112) according to Claim 2 , characterized in that the pistons (114) for changing the flow body (24, 132) are provided asynchronously displaceable in the piston guides (116). Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 2 or 3 , characterized in that for each flow body (24, 132) each have an inlet channel (20, 120) and an outlet channel (34, 124) is provided. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 2 to 4 , characterized in that the cleaning punches (38, 150) are provided asynchronously displaceable. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 5 , characterized in that the hollow body (26, 134) is substantially cylindrical. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 6 , characterized in that the cleaning punch (38, 150) to a filter support wall (28, 138) arranged in parallel rinsing piston (40,148) having a channel (54, 156). Filter assembly (10, 110) for a fluid (174) with a filter housing (12, 112) according to Claim 7 , characterized in that on the circumference (46, 158) of the cleaning punch (38, 150) a channel (50, 162) is provided which communicates with the channel (54, 156) of the flushing piston (40, 148) via a spoke channel ( 48, 160) is connected. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 8th , characterized in that a drive mechanism (64) is provided for the cleaning punch (38, 150), which guides the cleaning punch (38, 150) along the filter support wall (28, 138). Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 6 to 9 , characterized in that the openings (29) are arranged annularly around and in the filter support wall (28, 138). Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 10 , characterized in that the inlet channel (20, 120) with the interior (22, 136) and / or the outlet channel (34, 124) is connected to the exterior space (32). Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 11 , characterized in that the filter housing (12, 112) has a detachable housing cover (16, 144) through which the flushing piston (40, 148) is guided. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 12 , characterized in that a pressure generator, which presses the fluid (174) with pressure in the interior (22, 136) of the flow body (24, 132) for filtering. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 13 , characterized in that a filter element (31, 142) in the outer space (32) on the filter support wall (28, 138) of the hollow body (26, 134) is arranged. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 14 , characterized in that a filter element (31, 142) between the hollow body (26, 134) and a hollow body (26, 134) surrounding the perforated plate (30, 140) is arranged. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 15 , characterized in that a filter element (31, 142) in the interior (22, 136) on the hollow body (26, 134) is arranged. Filter arrangement (10, 110) for a fluid (174) with a filter housing (12, 112) according to one of Claims 1 to 16 , characterized in that the filter elements (31, 142) and / or the cylindrical perforated plate (30, 140) with respect to a longitudinal axis (71, 169) in longitudinal section have a concave, trapezoidal or other curved shape. Filter arrangement (210, 290) for a fluid (174) with a filter housing (212, 292), wherein a) the filter housing (212, 292) has an inlet opening (220, 298) for an inlet channel (222, 300) and an outlet opening ( 224, 314) for an outlet channel (226, 312), b) a flow body (238, 296) is provided in the filter housing (212, 292), c) the flow body (238, 296) has a filter support wall (248, 306) d) the antechamber (244, 302) with the inlet channel (222, 300) and the rear chamber (240, 310) with the outlet channel (226, 312), e) in the filter support wall (248, 306) openings (29) are provided through which the fluid (174) is passed to filter, f) a slidable cleaning punch (264, 316) is provided, which deposits the filter support wall (248, 306), characterized in that g) the flow body (238, 296) in a portion (128) of a K olbens (214, 294) is provided, wherein the piston (214, 294) in the filter housing (212, 292) up to a stop (218, 336) in a piston guide (216, 295) is designed to be displaceable, so that the flow body (238, 296) for changing out of the filter housing (212, 292) is guided. Filter assembly (210, 290) for a fluid (174) with a filter housing (212, 292) after Claim 17 , characterized in that the flow body (238, 296) has a concave, trapezoidal or other curved shape. Filter arrangement (210, 290) for a fluid (174) with a filter housing (212, 292) according to one of Claims 18 to 19 , characterized in that the rear space (240, 310) to the outlet opening (224, 314) with respect to a longitudinal axis (256, 330) in longitudinal section has a concave, trapezoidal, conical or other curved shape.

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