Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/50—Details of extruders
  • B29C48/69—Filters or screens for the moulding material
  • B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
  • B29C48/6912—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a single rectilinearly reciprocating slide
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/27—Cleaning; Purging; Avoiding contamination
  • B29C48/2725—Cleaning; Purging; Avoiding contamination of filters
  • B29C48/273—Cleaning; Purging; Avoiding contamination of filters using back flow
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/255—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
  • B29C48/27—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
• • 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 filtering device for fluids, comprising a housing having at least two GeHousebohrun ⁇ gene in which two axially displaceable screen plunger are integrally ⁇ assigns each have at least one screen cavity on ⁇ , in which a filter medium is to be placed, and comprising:
• Such a filtering device is known from PCT / WO2004 / 026432 AI. This makes it possible to keep a continu ⁇ ous production operation to continue, even if one of the four screen cavities must be cleaned.
• By dividing the fluid flow to two Screening studs, each with two screen cavities, can constantly maintain 50% of the total filter area in production operation, while the other screen areas are backwashed or completely replaced.
• Object of the present invention is to improve a filtration device of the type mentioned so that the backwash channel without an external valve is shut off ⁇ bar.
• the invention is based on in the backwashing of the screen plunger channel positions the grant Vietnamesekanäle no longer directly from any screen cavity to the outside of Ge ⁇ koruses to lead and to install a valve at the mouth, but the respective other screen plunger, which is located in its production position, to use as a valve.
• a backwash inlet channel which leads away from the screen cavity to be washed, leads within the housing to the housing bore for the respective other screen bolt and first opens onto its lateral surface.
• a further part of the backwash channel namely a backwash passage channel, which leads to an opening at the GeHouseaus deri ⁇ te, opens at the lateral surface of the second Siebbol ⁇ Zen, whereby the backwash channel is interrupted altogether.
• the deflection channels are formed as simple circumferential grooves on the outside of the screen pins. Since the screen plunger is sealingly guided in the housing bore, also results in an outward suction ⁇ ner channel.
• the common backwash may be formed by two portions which are zuei ⁇ Nander made V-shaped and which intersect at a point on the outside of the housing, the backwash ⁇ inlet channel is closed at the intersection by a shut-off again.
• the sections can thus be easily formed by two oblique, introduced from the outside of the housing forth holes.
• each can be individually connected to the backwash outlet Gezzau ⁇ seaußenseite.
• the ventillonskanal is formed from two V-shaped each other employed ventêtteilaustrittskanälen that lead to a common end of a backwash or equal to a common outlet opening on the outside of the housing.
• This allows a particularly space-saving design of the flow paths, which in particular makes it possible to arrange the common outlet opening at the end face of the housing between the housing bores.
• the particular advantage of the common backwash inlet channel described above lies in the fact that an internal flow connection can be formed between the respective dirt sides of the adjacent screen cavities, which is completely independent of the backwashing function described above. This flow connection via the common backwash inlet channel makes it possible to refill a cleaned and emptied sieve cavity from the dirty side with fluid, in particular plastic melt, and thereby vent it.
• the filling always takes place from the outlet side, but where due to the pressure drop at the filtration device itself or too low a system pressure in the downstream processing machines, the fluid flow is too low to achieve a fast filling and venting and to return the affected screen cavity to the production position as soon as possible.
• the double benefit of the formation of the backwashing channel according to the invention is achieved in that the Siebkavi- tucien each have in addition to the known vent channel, which extends in the venting position of a screen pin from the respective top of Siebkavmaschine to the housing outside, a preflow channel, which also from Edge of the Siebkavtician runs in the direction of the outside of the housing, but extends axially less far than the vent channel and does not lead out of the housing in the venting position.
• the pre-flow channel is without function in the venting ⁇ the Siebkavtician.
• the prefilter channel establishes a connection between the screen cavity there and the common backwash inlet channel.
• the screen cavity local in a compound having at least one of principleska ⁇ ducts in the housing.
• An additional valve for closing the backwashing channel can additionally be provided in order to be able to carry out a backwashing even if the screen bolt which has the deflection channel according to the invention is repaired or is being serviced or can not be moved into the position for other reasons, in which he should complete the backwash with his backwash diverting channel.
• FIG. 2 shows a filter device in the venting position in a side view of the inlet side
• FIG. 3 shows the filtration device according to FIG. 1 in top view
• FIG. 5 is an enlargement of the view of Figure 4.
• 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 fed by inlet part channels 13.1, 13.2, 13.3, 13.4, which branch off from a common inlet opening 13 on the housing 10.
• circumferential grooves 25, 35 can be seen on the mutually facing sides of the projecting ends of the screen pins 20, 30, which are required for the backwashing process described below.
• the sieve Bolt 20, 30 are formed symmetrically with respect to a vertical axis, so that correspondingly on the other Be ⁇ te the filtering device, at the respective other end of the screen pins 20, 30 and circumferential grooves 26, 36 are provided.
• a common backwash inlet channel 41, 42 is provided for each pair of superposed Siebkavmaschineen 21, 31 and 22, 32, which extends within the housing 10.
• a backwash outlet 43, 44 is also provided, which branches from egg ⁇ ner common mouth at the outside of the housing into two portions 43.1, 43.2 (see. Fig. 4), each ⁇ wells to one of the screen cavities 21, 31 and 22, 32 lead.
• 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 mouths of the backwash inlet channels 41 and 42 can be established.
• the lower screen pin 30 with its screen cavities 31, 32 is in a production position, although it is not arranged exactly in the center with respect to the central inlet ⁇ opening 13. Nevertheless, the two screen cavities 31, 32 of the lower screen pin 30 by each because two inlet sub-channels 13.3 flowed.
• the ge ⁇ rings axial displacement of the lower screen pin 30 from the center position is necessary to bring the circumferential groove 35 in coincidence with the mouths of the Ruthêteinbergska- channel 41 and the Ruth Cyprusaustrittskanals 43 and thus to open the flow path for the fluid.
• FIG. 3 shows the filtration device 100 in the backwash position in a view from above.
• the position of the screen plunger 20, 30 is, as shown in the side view of Figure 1, that is, the OBE ⁇ re screen plunger 20 is shifted to the left.
• FIG. 4 again shows the backwashing position, specifically in an enlarged detail of a perspective view.
• the backwashing inlet channel 41 consists of two sections 41.1, 41.2 which are set in a V-shape relative to one another and have been manufactured from a common point of intersection 41.3 on the outside of the housing. The intersection has subsequently been sealed again with a closure element.
• the back Sullivanaustrittskanal 43 is similarly made: from a common intersection point on the housing outside of Zvi ⁇ rule the screen plunger 20, 30 are two oblique bores 43.1, 43.2 introduced in the direction of the respective Siebkavmaschineen 21, 31. However, the intersection remains open here, because it forms the common sudzzikanal- outlet 43.3.
• FIG. 5 shows a further enlarged detail from FIG. 4. Therein, the flow path is shown with the dot-dash line.
• the plastic melt flows from the rear, ie from the clean side, into the upper left Siebkavmaschine 21, and through the filter element not shown here into the remindlüleintrittskanal 41. It then enters the circumferential groove 35 on the upper side of the lower screen pin 30 and about this in the lower portion 43.2 of the backwash outlet channel 43 to the outlet opening 43.3 on the housing 10th
• FIG. 2 again shows the filtration device 100 in a side view of the inlet side.
• the Darge ⁇ presented position of the screen pin 20,30 is the filling and venting the previously cleaned, left upper Siebkavtician 21 reached.
• the upper screen bolt 20 has been displaced even further to the left, so that the venting channel 21. 2 now ends outside the housing 10.
• the pre-flow channel 21.1 which is not required for the venting of its own Siebkavtician 21, ends just before the housing edge.
• the right sieve ⁇ cavity 32 is in production. It is still fed by one of the inlet subchannels.
• the left Siebkavtician 31 is still just in overlap with the inlet part channel 13.3, so that melt can flow into the Siebkavtician 31.
• the preflow channel 31.1 of the screen cavity 31 is in communication with the common backwash inlet channel 41 of the two adjacent screen cavities 21, 31.
• the Vorflutkanal 31.1 also serves as a throttle to achieve a very slow filling, which allows even with highly viscous liquids a uniform, bubble-free loading ⁇ filling.
• the preflow channel is therefore preferably wedge-shaped, so that its opening cross-section can be varied by fine tuning of the axial position of the screen pin.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=48669742

Family Applications (1)

Country Status (2)

Cited By (2)

Citations (8)

• 2012
  • 2012-06-06 DE DE102012104924A patent/DE102012104924A1/de not_active Withdrawn
• 2013
  • 2013-06-06 WO PCT/DE2013/100204 patent/WO2013182193A1/fr not_active Ceased

Patent Citations (8)

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