Device for filtering a fluid especially for plastic-processing installations

• US 20050016914A1
• Filed: 07/18/2003
• Published: 01/27/2005
• Est. Priority Date: 09/17/2002
• Status: Active Grant

• Current Assignee: Nordson Holdings S.a.r.l. & Co. KG (Nordson Corporation)
• Original Assignee: Kreyenborg Verwaltungen Und Beteilgungen GMBH & Company KG
• Inventors: Wostmann, Stefan, Middler, Robert
• Granted Patent: US 7,419,592 B2
• Time in Patent Office: Days
• US Class Current: 210/340
• CPC Class Codes: B01D 29/01 with flat filtering elements B01D29/39 takes precedence
• CPC Class Codes: B01D 29/52 in parallel connection
• CPC Class Codes: B01D 29/66 by flushing, e.g. counter-current air-bumps
• CPC Class Codes: B01D 29/96 in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters B01D29/09, B01D29/70 take precedence
• CPC Class Codes: B01D 35/12 Devices for taking out of action one or more units of multi- unit filters, e.g. for regeneration
• CPC Class Codes: B29C 48/03 characterised by the shape of the extruded material at extrusion
• CPC Class Codes: B29C 48/273 using back flow
• CPC Class Codes: B29C 48/6912 the filters being fitted on a single rectilinearly reciprocating slide B29C48/692 takes precedence

Abstract

The invention relates to a device for filtering a fluid, especially a liquefied plastic, said device comprising a housing, a supply channel, a discharge channel and optionally backwash channels. At least two filter elements are arranged in corresponding filter regions in the flow path of the fluid, in a filter carrier which is mounted in such a way that in can be perpendicularly displaced in relation to the direction of flow, said filter elements being able to communication with the supply channel and the discharge channel. Each filter region comprises two supply partial channels which are worked in to the filter carrier or the housing and are oriented away from the filter regions towards the discharge channel. Said discharge channel comprises housing partial channels which flow together to form the discharge channel. The supply channels can communication with the housing partial channels by displacing the filter carrier in such a way as to guide the fluid, and optionally the filter regions can be connected to the backflow channels by displacing the filter carrier.

Claims

1. Device for filtering a fluid, especially a liquefied plastic, said device having a housing (1) with at least one supply channel (2) and a discharge channel (3), in which device at least two filter elements (5, 6) are arranged in the flow path of the fluid in corresponding filter regions (7, 8) in a filter carrier (4) that is mounted such that it can be displaced perpendicularly in relation to the flow direction, which filter elements can be made to communicate with the supply channel (2) and with the discharge channel (3), wherein

a) each filter region (7, 8) displays two filter-carrier partial channels (9, 10;

11, 12) formed in the filter carrier (4), which partial channels are oriented away from the filter region (7, 8) towards the discharge channel (3),

b) the discharge channel (3) displays four housing partial channels (14, 15;

16, 17) that merge to form the discharge channel (3),

c) the filter-carrier partial channels (9, 10;

11, 12) can be made to communicate with the housing partial channels (14, 15;

16, 17) through displacement of the filter carrier (4) in order to guide the fluid.

2. Device according to claim 1, wherein the filter carrier can be displaced such that both filter elements (5, 6) can be removed from their filter regions (7, 8).

3. Device according to claim 1, wherein several filter carriers (4) are arranged in a housing (1) one atop another or side by side.

4. Device according to claim 1, through displacement of the filter carrier (4) the filter regions (7, 8) can be connected to backflush channels (18, 19).

5. Device according to claim 4, wherein through displacement of the filter carrier (4) one filter region can be adjusted such that no connection of the filter region exists with either the supply channel or with the backflush channel.

6. Device according to 4, characterized in that wherein the filter carrier (4) can be displaced such that one filter region produces a connection among the supply channel (2), two filter-carrier partial channels, two housing partial channels, and the discharge channel (3), while the other filter region produces a connection among a filter-carrier partial channel of the one filter region, a housing partial channel, and a backflush channel.

7. Device according to claim 1, wherein the supply channel (2) with the supply channels (24, 25) and the merging of the housing partial channels (14, 15;

16, 17) to form the discharge channel (3) are produced in connection plates (20, 21) that are connectable to the housing (1).

8. Device according to claim 1, wherein a flow divider (22) is arranged in the supply channel (2) in front of the two filter regions (7, 8).

9. Device according to claim 1, wherein a flow diverter (23) is arranged in the discharge channel (3).

10. Device for filtering a fluid, especially a liquefied plastic, said device having a housing (1) with a supply channel (2) and a discharge channel (3), in which device at least two filter elements (5, 6) are arranged in the flow path of the fluid in corresponding filter regions (7, 8) in a filter carrier (4) that is mounted such that it can be displaced perpendicularly in relation to the flow direction, which filter elements can be made to communicate with the supply channel (2) and with the discharge channel (3), each filter region displaying on the clean filter side an outlet channel (9) formed in the filter carrier (4), which outlet channel is oriented away from the filter region (7, 8) towards the discharge channel (3), wherein

a) each filter region (7, 8), viewed along the longitudinal axis of the filter carrier (4), tapers to an outlet channel (29) having an elongate form,

b) the discharge channel (3), viewed along the longitudinal axis of the filter carrier (4), has an elongate form on the filter-carrier side and tapers toward its open end in the manner of a circle,

c) the filter regions (7, 8) formed in the filter carrier (4) lie closely enough next to each other in the displacement direction of the filter carrier (4) that during the pushing out of a filter (5 and 6) from the housing (1) for the purpose of a filter change, communication is always maintained between the supply channel (2) and discharge channel (3) with the interposition of a filter (5 or 6).

11. Device according to claim 10, wherein the discharge channel (3) is formed in an add-on part (30) that is connectable to the housing (1).

12. Device according to claim 10, wherein the supply channel (2) divides in the housing (1) into two supply partial channels in each case, (31, 32) or (33, 34) respectively, which partial channels lead to the filter elements (5, 6).

13. Device according to claim 10, wherein the outlet channels (29) are formed as individual bores arranged in a row.

14. Device according to claim 10, wherein the discharge channel (3) is formed as individual recesses arranged in a row.

15. Device according to claim 10, wherein characterized in that the supply channel (2) is formed in an add-on part that is connectable to the housing (1).

16. Device according to claim 10, wherein characterized in that backflush channels and blocking devices for the latter are provided.