Pressure filter having depending tubular filter elements
阅读：385发布：2023-07-21
专利汇可以提供Pressure filter having depending tubular filter elements专利检索，专利查询，专利分析的服务。并且A pressure filter unit equipped with depending tubular filter elements comprising a tubular filter fabric element surrounding a rigid tubular liquid-permeable backing member, featuring an improved simple lead proof connection between the top ends of the filter elements and the supporting tube plate in the filter unit, which connection is resistant to backwash pressure supplied to the tubular filter elements through the upper open ends thereof.，下面是Pressure filter having depending tubular filter elements专利的具体信息内容。
1. In a pressure filter of the type having depending tubular filter elements exposed to a pulp to be filtered under pressure, and delivering filtrate liquid from the upper open end, the combination which comprises a horizontal tube plate having holes for the insertion therein of tubular filter elements, a filter element inserted in said tube plate, which comprises a liquid-permeable rigid Tube having an upper open end provided with a flange, a filter sleeve having a closed end and an open end, surrounding said tube, and consisting of a filter media constructed and arranged so as to be radially expandable from its normal diameter, a ring of substantially non-deformable material, said ring having an inner diameter substantially equal to the diameter of the sleeve, inserted into said open end so that said media is stretched radially about said ring, accommodating the ring in a plane perpendicular to the longitudinal axis of the sleeve, the unstretched open end portion of the sleeve being turned inwardly through said ring, and connected peripherally to the adjoining surrounding portion of said sleeve thus forming an annular outwardly overhanging terminal bead at said open end, confined between said tube plate and said flange, retainer means engaging the top side of said flange, and means for securing said retainer means relative to said tube plate whereby said bead is compressed in such a manner that the filter media enveloping said ring provides a pair of annular compression seals effective between said ring and said tube plate, and between said ring and said flange respectively.
2. The combination according to claim 1, wherein the filter sleeve material comprises a length of filter fabric having longitudinal edges, with the threads of the weave intersecting substantially at right angles, but oriented diagonally to said edges, said edges being interconnected to constitute said sleeve.
3. The combination according to claim 1, wherein the filter sleeve material consists of a weave having threads normally intersecting substantially at right angles, but extending in a spirally oriented direction relative to the axis of the longitudinal filter element, whereby said filter sleeve is rendered radially expandable.
4. The combination according to claim 1, wherein said ring is of circular cross-sectional profile, whereby the compression effective in said annular seals is concentrated along a relatively narrow annular zone.
5. The combination according to claim 1, wherein said retainer means comprises a retainer plate, constructed and arranged for securing a plurality of said filter elements.
6. A tubular filter element which comprises a liquid permeable rigid tube having an upper open end provided with a flange, a filter sleeve having a closed end and an open end, surrounding said tube, and consisting of a filter media constructed and arranged so as to be radially expandable from its normal diameter, a ring of substantially non-deformable material, having an inner diameter substantially equal to the diameter of the sleeve, inserted into said open end so that said media is stretched radially about said ring, accommodating the ring in a plane perpendicular to the longitudinal axis of the sleeve, the unstretched open end portion of the sleeve being turned inwardly through said ring, and connected peripherally to the adjoining surrounding portion of said sleeve, thus forming an annular outwardly overhanging terminal bead adjoining said flange.
7. The filter element according to claim 6, wherein the filter sleeve material consists of a weave having threads normally intersecting substantially at right angles, but extending in a spirally oriented direction relative to the axis of said filter element, whereby said filter sleeve is rendered radially expandable.
8. The filter element according to claim 6, wherein said ring is of circular cross-sectional profile.
9. The filter element according to claim 6, wherein the filter sleeve material comprises a length of filter fabric having longitudinal edges, with the threads of the weave intersecting substantially at right angles, but oriented diagonally to said edges, said edges being interconnected to constitute said sleeve.
10. The method of making a filter sleeve for the prupose substantially such as herein described, which comprises, providing a length of filter cloth that is stretchable transversely of its longitudinal extent, interconnecting the longitudinal edge portion of said length of filter cloth in such a manner as to form a tubular shape representing a partly finished sleeve, closing one end of said tubular shape, providing a ring of substantially non-deformable material, and having an inner diameter substantially equal to the diameter of the sleeve, inserting and positioning said ring in the open end of said partly finished sleeve, whereby said filter cloth is radially stretched to accommodate said ring in a plane extending transversely of said sleeve, turning the unstretched free end portion of the filter cloth inwardly through the ring, and connecting said turned-in portion peripherally to the adjoining surrounding portion of the sleeve, so that there is formed a bead radially outwardly overhanging from said filter media.
11. The method according to claim 10, wherein said length of filter cloth is provided from a larger piece of cloth having a weave wherein the threads intersect at right angles, by cutting said cloth on the bias relative to the direction of said threads, and interconnecting the longitudinal edges of said cloth.
12. A filter sleeve having an open top end and a closed bottom end, adapted to be fitted over a liquid permeable rigid tube, and to be subjected to external liquid filtration pressure, said filter sleeve consisting of a filter fabric having a weave of threads normally intersecting substantially at right angles, but extending in a spirally oriented direction relative to the longitudinal axis of the sleeve, whereby said sleeve is radially expandable beyond its normal diameter, a circular uninterrupted ring member consisting of substantially non-deformable material, having an inner diameter substantially equal to the diameter of the sleeve, inserted into said open end of the ring so that the fabric expands hugging said ring in an annular bulge extending in a plane perpendicular to the longitudinal axis of the sleeve, and formed between the directly adjoining unexpanded portions of the sleeve, the unstretched open end portion of the sleeve being turned inwardly through said ring, and connected peripherally to the thus adjoining unexpanded surrounding portion of said sleeve, to constitute a continuous beaded flange, the diameter of the annular center line of said ring being substantially greater than the outside diameter of the sleeve, and large enough to provide mutually opposed unbroken annular transverse sealing faces of sleeve material at the top and at the bottom of said beaded flange.
13. The filter sleeve according to claim 12, wherein the filter sleeve material comprises a length of filter fabric having longitudinal edges, with the threads of the weave intersecting substantially at right angles, but oriented diagonally to said edges, said edges being interconnected to constitute said sleeve.
14. The filter sleeve according to claim 12, wherein said ring member is of circular cross-sectional profile.
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