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US 4,839,037 AGranted
Tapered, spirally wound filter cartridge and method of making same
AssigneeOsmonics, Inc.
InventorsRobert A. Bertelsen, David J. Paulson
Life of this patent
Estimating the term…
Abstract
A spirally wound filter cartridge and a method of making the same in which the cartridge includes an elongated, centrally disposed tube or mandrel, and a sheet of filtration material spirally wound around the tube such that the cartridge has a tapered configuration with a first end of the cartridge being greater in diameter than the second end. The present invention also relates to a filtration device having a filter cartridge housing adapted to receive the above mentioned tapered filter cartridge.
Claims19
A spirally wound, cross flow filter cartridge comprising:
- an elongated, centrally disposed permeate tube having a first set of openings;
- a sheet of filtration materials spirally wound around said permeate tube, said sheet of filtration materials comprising a pair of membrane elements and a permeate carrier disposed therebetween, said pair of membrane elements having corresponding edge portions sealed to said permeate tube with said first set of openings disposed therebetween and the remaining edge portions sealed to one another;
- said cartridge having first and second transverse ends generally circular in configuration and an outer surface portion joining said ends in which said first end is greater in diameter than said second end and said outer surface is tapered from said first end to said second end, said first end defining an inlet end which is uncapped and capable of receiving fluid flow and said second end defining an outlet end which is uncapped and capable of providing fluid flow whereby fluid to be filtered enters said inlet end and flows longitudinally in a direction generally parallel to said permeate tube toward said outlet end with at least a portion of said fluid passing through one of said membrane elements and into said permeate tube through said first set of openings.
A cross-flow filtration device comprising:
- a filter cartridge housing having an elongated sump having an open top, a closed bottom and a tapered side wall extending between said top and bottom, said top being larger than said bottom and said tapered side wall having a greater diametrical dimension at its top than at its bottom;
- an end cap connectable with said open top;
- a spirally wound, tapered filter cartridge disposed within said sump and comprising:
- an elongated, centrally disposed permeate tube having a first set of openings;
- a sheet of filtration materials spirally wound around said permeate tube, said sheet of filtration materials comprising a pair of membrane elements and a permeate carrier disposed therebetween, said pair of membrane elements having corresponding edge portions sealed to said permeate tube with said first set of openings disposed therebetween and the remaining edge portions sealed to one another;
- said cartridge having first and second transverse ends generally circular in configuration and an outer surface portion joining said ends in which said first end is greater in diameter than said second end and said outer surface is tapered from said first end to said second end, said first end defining an inlet end which is uncapped and capable of receiving fluid flow and said second end defining an outlet end which is uncapped and capable of providing fluid flow whereby fluid to be filtered enters said inlet end and flows longitudinally in a direction generally parallel to said permeate tube toward said outlet end with at least a portion of said fluid passing through one of said membrane elements and into said permeate tube through said first set of openings;
- a permeate outlet in said end cap;
- means for connecting said permeate outlet with said permeate tube;
- a feed inlet in said end cap;
- and
- means for connecting said feed inlet with said first end of said filter cartridge.
8 more elements
A method of making a cross flow, tapered filter cartridge having a pair of transverse, generally circular first and second ends which are uncapped and capable of receiving and providing fluid flow, respectively comprising the steps of:
- laying up a sheet of filtration material having a permeate tube connecting edge, first and second side edges each having a first end adjacent to a respective end of said permeate tube connecting edge and extending therefrom at substantially right angles and a beveled edge generally opposite to said permeate tube connecting edge and adjacent to a second end of each of said side edges, said first side edge being longer than said second edge, said sheet of filtration material comprising a pair of similarly configured membrane material sheets and a permeate carrier sheet disposed therebetween;
- securing said permeate tube connecting edge to a permeate tube having a first set of openings with the permeate tube connecting edges of said pair of membrane sheets being secured to said tube on opposite sides of said first set of openings;
- gluing said pair of membrane material sheets together, with said permeate carrier sheet disposed therebetween, along said side edges and said beveled edge;
- and
- spirally winding said filtration material around said permeate tube.
2 more elements
A method of making a cross flow, tapered filter cartridge having a pair of transverse, generally circular first and second ends which are uncapped and capable of receiving and providing fluid flow, respectively comprising the steps of:
- laying up a sheet of filtration material having a permeate tube connecting edge, first and second side edges each having a first end adjacent to a respective end of said permeate tube connecting edge and extending therefrom at substantially right angles and an edge generally opposite to said permeate tube connecting edge and adjacent to a second end of each of said side edges, said sheet of filtration material comprising a pair of similarly configured membrane material sheets and a permeate carrier sheet disposed therebetween;
- securing said permeate tube connecting edge to a permeate tube;
- gluing said pair of membrane material sheets together with said permeate carrier sheet disposed therebetween, along said side edges;
- partially spirally winding said filtration material around said permeate tube;
- cutting said sheet of filtration material at a bevel relative to the longitudinal axis of said tube;
- gluing said pair of membrane material sheets together along said beveled edge;
- and
- completing the spiral winding of said filtration material around said permeate tube.
5 more elements
Dependencies are inferred from the claim text.