Filter device, in particular for high-pressure applications in a molten polymer filtration

• US 20040188345A1
• Filed: 02/13/2004
• Published: 09/30/2004
• Est. Priority Date: 08/28/2001
• Status: Active Grant

• Current Assignee: Hydac Process Technology GmbH (HYDAC International GmbH)
• Original Assignee: Hydac Process Technology GmbH (HYDAC International GmbH)
• Inventors: Hausdorf, Jurgen, Schorn, Thomas, Sandmeyer, Otto, Wnuk, Ralf, Lang, Norbert
• Granted Patent: US 7,210,584 B2
• Time in Patent Office: Days
• US Class Current: 210/436
• CPC Class Codes: B01D 29/15 arranged for inward flow filtration
• CPC Class Codes: B01D 29/925 containing liquid displacement elements or cores
• CPC Class Codes: B29C 48/03 characterised by the shape of the extruded material at extrusion
• CPC Class Codes: B29C 48/694 Cylindrical or conical filters

Abstract

The invention relates to a filter device, in particular for high-pressure applications in a molten polymer filtration, with a screw-in piece (10), provided with a first threaded section (12), for fixing the filter device, a second threaded section (14), for fixing a filter medium (16), in particular in the form of a metal wool and with a perforated support tube (18) for the metal wool. The other free end thereof is provided with a volume displacer (24), whereby the metal wool is surrounded by a support grid (20) and fixed by two fixing pieces (28, 30), held at a separation from each other by means of the support grid (20), one of which (28) serves for the fixing to the second threaded section (14) of the screw-in piece (10) and the other as a handle (30) for the fixing thus carried out. As a result of the volume displacer 924) being a one-piece component of the support tube (18) and the fixing piece (30) in the form of a handle covering the volume displacer (24), the filter device is significantly improved in that the above permits a simple and rapid assembly procedure for the exchangeable filter medium and also the filter element construction is held such as to be free of damaging torsional loads.

Claims

1. A filter device, in particular for high-pressure applications in a molten polymer filtration, having a screw-in component (10) which is provided with a first threaded section (12) for fixing the filter device, which has a second threaded section (14) for fixing a filter medium (16), especially one in the form of metal wool, and which has for the metal wool a perforated supporting tube (18) provided on its other free end with a volume displacement component (24), the metal wool enclosed in a support grid (20) being retained by two fixing components (28, 30) which, being spaced a certain distance from each other by the support grid (20), one of which (28) serves the purpose of fixing on a second threaded section (14) of the screw-in component (10) and other represent a handle (30) for the respective fixing, the volume displacement component (24) being an integral component of the supporting tube (18), and the fixing component (30) being in the form of a handle encircling the volume displacement component (24).

2. The filter device as claimed in claim 1, wherein an annular seal (32), in particular one in the form of a metal wool seal, is mounted between the first (12) and the second (14) threaded sections of the screw-in component (10) when the first fixing component (28) has been screwed on, on the free frontal surface of such first fixing component (28).

3. The filter device as claimed in claim 1, wherein the filter medium (16) is retained by projections of material (34), in particular also by recesses in the fixing components (28, 30), in specific fixing positions on these fixing components (28, 30).

4. The filter device as claimed in claim 3, wherein the fixing positions are an integral component of the fixing components (28, 30).

5. The filter device as claimed in claims 1, wherein the fixing component (30) serving as handle is spaced a certain distance (36) in the axial direction of the filter device from the volume displacement component (24) and wherein the volume displacement component (24) is provided with tapering support areas (38) which are at least to some extent in contact with the support area (40) of the handle (30) after one of the fixing components (28) has been screwed in.

6. The filter device as claimed in claims 1, wherein the fixing component (30) serving as handle is provided with a tapered element (42).

7. The filter device as claimed in claims 3, wherein one fixing component (28), which serves the purpose of fixing on the second threaded section (14), consists of two sections (28a,b) interconnected in particular by a weld seam one section of which (28a) has the threaded component for the second threaded section (14) of the screw-in component (10) and the other section (28b) of which has the projection of material for fixing the filter medium (16).

8. The filter device as claimed in claims 1, wherein the screw-in component (10) forms with the supporting tube (18) and the volume displacement component (24) a lasting structural unit, and wherein the filter medium (16) with its fixing components (28, 30) forms a replacement unit subject to wear.

9. The filter device as claimed in claim 9, wherein both modular units consist more or less of stainless steel materials.