초록 ▼

A filter element is formed by spirally winding at least two layers of filter material about a central, perforate supporting core. The layers include a relatively fine porous filter material and a relatively coarse porous filter material. The layers may be formed from blankets of material, or one or

A filter element is formed by spirally winding at least two layers of filter material about a central, perforate supporting core. The layers include a relatively fine porous filter material and a relatively coarse porous filter material. The layers may be formed from blankets of material, or one or both layers may be pleated. The fine filter material extends beyond the edge of the coarse filter material to overlie and close the longitudinal ends of the layers of the coarse material. Fluid to be filtered passes radially through the element until it encounters a clogged or plugged area. The fluid will then take a circumferential spiral route until it again finds an open area of the filter and can pass radially toward the core.

대표청구항 ▼

A fluid filter element, comprising: a hollow perforate cylindrical supporting core; a relative fine filtering media of substantially cross section spirally wound about the supporting core with adjacent layer spaced from each other and with the relatively fine filtering media exiting at the core, the

A fluid filter element, comprising: a hollow perforate cylindrical supporting core; a relative fine filtering media of substantially cross section spirally wound about the supporting core with adjacent layer spaced from each other and with the relatively fine filtering media exiting at the core, the fine filtering media accommodating fluid flow for filtering in both a radial and circumferential direction through the cross section and with free access through the cross-section to the core; a relatively coarser filtering material of substantial cross section disposed in the space between the layers of the fine filtering media and with the relatively coarser filtering material exiting at the core, the coarser filtering material accommodating fluid flow for filtering in both a radial and circumferential direction through the cross section and with free access through the cross-section to the core; and means closing the longitudinal ends of the coarser filtering material.