초록 ▼

The specification discloses a filter apparatus including spirally wound tissue layer filter elements for filtering fluid and a seal between the filter elements to prevent fluid from bypassing the filter elements. A flow tube extends through the center of the filter elements. A resiliently deformable

The specification discloses a filter apparatus including spirally wound tissue layer filter elements for filtering fluid and a seal between the filter elements to prevent fluid from bypassing the filter elements. A flow tube extends through the center of the filter elements. A resiliently deformable mesh spacer is located on the flow tube between the filter elements to insure formation of a radial passageway therebetween. The seal is applied between the filter elements along their circumferential edges in a melted state and migrates into and between the tissue layers and interstices of the filter elements and the mesh of the spacer. As the seal cools and hardens it adheres to the filter elements and the spacer. A seal may likewise be applied between the filter elements and the flow tube. Application of the seals in this manner prevents fluid flow communication between the area outside of the filter elements and the radial passageway except by means of passage of fluid between the layers of tissue in the filter elements so that the filtering function is maximized.

대표청구항 ▼

A filter apparatus for filtering fluids from an external fluid source, comprising: at least first and second annular filter elements, each of said filter elements having a centrally located passageway and being constructed to allow essentially only axial flow; a flow tube disposed within said passag

A filter apparatus for filtering fluids from an external fluid source, comprising: at least first and second annular filter elements, each of said filter elements having a centrally located passageway and being constructed to allow essentially only axial flow; a flow tube disposed within said passageways of said filter elements, said filter elements being coaxially disposed adjacent each other on said flow tube; a shell for receiving and containing said filter elements and said flow tube; a first port located on said shell for providing fluid flow communication between the source of fluid and said filter elements; a second port located on said shell providing fluid flow communication from said flow tube through said shell; spacing means disposed between said filter elements to form an annular passageway therebetween, said spacing means extending radially outwardly from near said flow tube to near the outer edge of each of said filter elements and having interstices to provide flow communication between said filter elements and said annular passageway; means disposed adjacent said annular passageway on said flow tube to provide fluid flow communication between said annular passageway and said flow tube; and an outer seal disposed between said filter elements extending radially outwardly from the outer edge of said spacing means to the outer circumferential edge of each of said filter elements, and extending around the periphery of said filter elements, said outer seal adhering to each of said filter elements adjacent the seal around its circumference and along its radial length to prevent unfiltered fluid from contaminating the filtered fluid.