초록 ▼

A filter unit includes a cross-flow filtration assembly. The cross-flow filtration assembly includes an elongate cylindrical filter housing having an interior cylindrical wall defining an elongate filter cavity. The filtration assembly also includes a tangential feed inlet in fluid communication wit

A filter unit includes a cross-flow filtration assembly. The cross-flow filtration assembly includes an elongate cylindrical filter housing having an interior cylindrical wall defining an elongate filter cavity. The filtration assembly also includes a tangential feed inlet in fluid communication with the filter cavity extending substantially tangential to the interior cylindrical wall and an opposed retentate outlet port in fluid communication with the filter cavity. An elongate cylindrical filter cartridge supported in the filter housing includes an elongate porous cylindrical filter wall having an elongate cylindrical outer filter surface and an elongate inner filter surface defining a permeate passageway. One end of the filter cartridge defines a permeate outlet port in fluid communication with the permeate passageway and the opposite end of the cartridge is closed by a non-porous filter cap. A spiral fluid guide spans between the interior cylindrical wall of the filter housing and the outer filter surface of the cartridge to define a spiral fluid passageway extending between the feed inlet and retentate outlet ports. The spiral fluid passageway may be of dimension to impart secondary flow currents, particularly Dean-Flow currents, to fluid flowing therethrough to prevent particulate build-up on the filter media so as to better maintain permeate flow rate from the filter.

대표청구항 ▼

1. A cross-flow filtration assembly comprising:a filter housing including an elongate housing wall having opposed first and second open ends and an elongate cylindrical interior surface defining a housing cavity, a housing cap wall extending across said first open end of said housing wall, and a hou

1. A cross-flow filtration assembly comprising:a filter housing including an elongate housing wall having opposed first and second open ends and an elongate cylindrical interior surface defining a housing cavity, a housing cap wall extending across said first open end of said housing wall, and a housing base wall extending across the second open end of said housing wall; said filter housing further defining an input feed port, a permeate output port, and a retentate output port in fluid communication with said housing cavity, wherein said input feed port extends substantially tangential to said interior surface of said housing cavity; an elongate porous filter mounted within said housing cavity between said input feed port and said permeate output port, said filter defining an open first end an opposed closed second end and an elongate cylindrical permeate passageway extending therebetween, said permeate passageway in fluid communication with said permeate output port through said first open end of said filter, said filter including a substantially cylindrical outer filter surface, wherein said outer filter surface and said interior surface of said housing wall define an elongate annular gap therebetween; and a spiral guide extending through said annular gap and spanning between said outer filter surface and said interior surface of said housing wall so as to define a fluid flow passage extending between said input feed port and said retentate output port; wherein said spiral guide imparts a secondary flow across said outer filter surface and perpendicular to a fluid flowing through said spiral passageway.