Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/50—Details of extruders
  • B29C48/69—Filters or screens for the moulding material
  • B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
  • B29C48/6912—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a single rectilinearly reciprocating slide
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/27—Cleaning; Purging; Avoiding contamination
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/27—Cleaning; Purging; Avoiding contamination
  • B29C48/2725—Cleaning; Purging; Avoiding contamination of filters
  • B29C48/273—Cleaning; Purging; Avoiding contamination of filters using back flow
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/255—Flow control means, e.g. valves
  • B29C48/2554—Flow control means, e.g. valves provided in or in the proximity of filter devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/269—Extrusion in non-steady condition, e.g. start-up or shut-down
• • 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
• • 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
  • B29C48/76—Venting, drying means; Degassing means

Definitions

• the invention relates to a filtration device for fluids, having the features of the preamble of claim 1.
• Such a filter device of the type Siebbolzenwechs ⁇ ⁇ ler is known from PCT / WO2004 / 026432 AI. This makes it possible to maintain a continuous production operation, even if one of the four screen cavities must be cleaned. Can remain operational while the other Siebstel ⁇ len be flushed back or completely replaced by the division of the fluid flow in two screen plunger would do with two Siebkavi ⁇ constantly 50% of the total filter surface in production. In a preferred embodiment of the known filtration device, it is even possible to keep 75% of the total filter surface in production mode, while only one of the four screen cavities, a backwashing or replacement of the filter media takes place.
• the filling for example, is carried out after a cleaning process, is always of the exit side, but where due to the pressure drop across the filter device itself, or of too low a system pressure in the after ⁇ following processing machines of the fluid flow and / or - pressure is too low at times, to take a rapid, uniform and bubble-free filling and venting to Errei ⁇ chen and the affected screen cavity as soon as possible ⁇ in the production position.
• Object of the present invention is to improve a filtration device of the type mentioned so that a faster venting and filling a Sieb ⁇ cavity during startup or after a maintenance operation is possible.
• the particular advantage of the filtration device according to the invention is that between the respective clean sides of the adjacent Siebkavticianen an internal flow connection can be formed, which allows a cleaned and emptied Siebkavtician of the
• venting is equivalent to "filling". It is a position of the screen pin, in which at least one of its screen cavity to be filled with fluid, and just the trapped air just has to be displaced and can escape to the outside.
• the screen cavities each have, in addition to the known vent channel, which extends in the venting position of a screen bolt from the respective top of Siebkavmaschine to Genzouseaus ⁇ out side, have a preflow channel, which also from the edge of Siebkavtician in the direction of the hous - seaußenseite runs on the connecting channel, but which extends axially less far than the breather ⁇ tion channel and does not lead out of the housing in the venting position.
• the Vorflutkanal is at the screen cavity, which is located in a venting or filling position, without function.
• the Vorflutkanal makes a connection between the local Siebkavtician and the common connecting channel. Furthermore, in this position, the local screen cavity is in a connection with at least one of the inlet channels in the housing.
• the fluid flows through one of the inlet channels of the housing part in a screen cavity of the lower sieve ⁇ bolt which is located in a production position, that is, at least one of its Siebkavitä- is th flows through before the entry to the exit side.
• the connecting passage may be formed by two partial ⁇ pieces that are made V-shaped toward each other and intersect at a point on the outer side of the housing, wherein the connecting channel is closed again at the intersection by a shut-off element.
• the sections can thus be formed simply by two oblique ⁇ ge, introduced from the outside of the housing forth Boh ⁇ ments.
• a particularly advantageous embodiment provides to use the connecting channel at the same time as a backwashing or connect to a backwash channel, what in the course of the connecting channel only one off ⁇ lassö réelle must be provided, which is to be closed with a valve and open.
• That sieve pin which contains the screen cavity to be cleaned, there is a connection of the dirty side of the screen cavity to the connection channel.
• the fluid is ge ⁇ passes from the clean side by the filter element in the screen cavity and from there into the compound to be used as backwashing channel.
• the valve at the outlet opening the fluid can ⁇ with the detached impurities be rinsed out of the housing.
• the screen cavity on the adjacent bolt meanwhile has no connection to the connection and backwash channel.
• Fig. 1 shows a filtering device according to a first
• FIG. 2 shows the filtering device according to FIG. 1 in the backwashing position
• FIG. 3 is an enlargement of the view of Figure 1;
• Fig. 4 shows a filtering device according to a second
• FIG. 5 shows the filtration device according to the second embodiment in the backwashing position, in a sectional view from above;
• FIG. 6 shows the filtration device according to FIG. 4 in a side sectional view
• Fig. 7 the filter device according to Figure 5 in a side-sectional view.
• FIG. 1 shows a Filtriervorrich ⁇ device 100 according to the invention with a housing 10 with two housing bores 11, 12, in which screen pins 20, 30 are mounted axially displaceable.
• Each screen pin 20, 30 has in the illustrated embodiment ⁇ two screen cavities 21, 22, 31, 32. These are of inlet part channels 13.1, 13.3 fed, which branch off from a common Wegsöff ⁇ tion 13 in the housing 10.
• outlet part passages lead from each screening cavity to a common outlet opening.
• a common connecting channel 41, 42 is provided for each pair of superposed Siebkavticianen 21, 31 and 22, 32, which extends within the housing 10 and which can also serve as a backwash channel. It is during the venting position shown in Figure 1 respectively with the two overlying screen cavities 21, 31 and 22, 32 in a fluid-conducting connection.
• Each of the screen cavities 21, 22, 31, 32 has at least one ventilation channel 21.2, 22.2, 31.2, 32.2 in the upper area. Furthermore, each of the screen cavities 21, 22, 31, 32 each has at least one bleed channel 21.1, 31.1, which is arranged close to the housing center axis, so that a connection with the respective mouths of the connecting channels 41 and 42 can be produced.
• the preflow channel 31.1 of the Siebkavtician 31 is in communication with the connecting channel 41 at ⁇ the adjacent Siebkavticianen 21, 31.
• the connecting channel 41 is used in this position alone the internal transfer of the fluid from the lower Siebkavtician 31 in the upper Siebkavtician 21st
• the preflow channel is in the illustrated embodiment ⁇ example as a wedge-shaped Vorflutkanal 31.1 widelybil ⁇ det, which can also serve as a throttle due to its over the length changing cross section to achieve a very slow filling, even with navalvisko ⁇ sen liquids a uniform , bubble-free Be Shel ⁇ ment allows.
• the preflow channel 31.1 points with the ver ⁇ most recent end in the direction of the mouth opening of the connecting channel 41.
• the depth of the Vorflutkanals and increases from the wedge-shaped tip in the direction of Siebkavmaschine 31.
• the melt can be long ⁇ sam flow into the communication passage 41st
• the opening ⁇ cross-section can be varied at this point due to the wedge shape by the axial position of the Siebbol ⁇ zen 30 is changed.
• the lower screen plunger 30 is according to the invention said filtration ⁇ device 100 with the upper screen plunger 20 in a backwashing position for flushing the upper left screen cavity with its screen cavities 31, 32 is located in a production position.
• the right Siebkavtician 22 of the upper screen pin 20 is flowed through from the inlet opening 13 ago.
• On the exit side of the fluid through a housing designs passes occurs partial channels 14.1, 14.4 into the back of the left screen ⁇ cavity 21, from there into the backwashing channel used as a connecting channel 41 and through the outlet port 43 to the outside.
• FIG. 4 shows a second embodiment of a filter device 100 'in which the screen plunger 20, are largely consistent with the ge in Figure 1 ⁇ showed filtering device 100 and positioned in the venting position 30, to fill the upper-left screen cavity 21 and vent.
• the flow path is exact in this phase as described above with reference to Figures 1 and 2 be ⁇ .
• the only difference is that connecting channels 41 ', 42' are provided, which each have in the middle ei ⁇ ne outlet opening 43 ', which can be closed by means of a valve 50'. This can be at the
• FIG. 6 shows the filtration device 100 'in a cross-section during venting.
• the fluid passes from the dirty side - in FIG. 6, on the right - the lower screen cavity 31 into a lower section 41.2 'of the connecting channel 41'.
• the outlet ⁇ opening 43 ' is closed by the valve 50'; a valve stem 51 'is lowered.
• the second sub-channel 41.1 'of the connecting channel 41' leads to Siebkavtician 21 in the upper screen pin 20.
• the Siebkavtician 21 increasingly filled.
• the displaced air escapes through the ventilation channel 21.2 at the upper edge of the Siebkavmaschine 21.
• further ventilation channels provided.
• FIG. 5 shows, in the same view as FIG. 6, the backwashing process, in which the screen bolts 20, 30 are in the position shown in FIG.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Filtration Of Liquid (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48669741

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (10)

Family Cites Families (2)

• 2012
  • 2012-06-06 DE DE102012104939A patent/DE102012104939A1/de not_active Withdrawn
• 2013
  • 2013-06-06 WO PCT/DE2013/100203 patent/WO2013182192A1/fr not_active Ceased

Patent Citations (10)

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