Filter element for filtering fluids

摘要

A filter element for filtering fluids has a support tube having a circumferential wall provided with passages for a fluid. A hollow elongate filter medium is arranged axially on the support tube. The passages are adapted in regard to size; distribution; or size and distribution to a fluidic configuration of the filter element such that non-uniform fluid flows that exist in operation of the filter element upstream of the support tube are compensated. The filter element is used in particular in air filters for internal combustion engines.

主权项

1. A filter element for filtering fluids, the filter element comprising:
an axially elongated support tube having
a first axial end;an opposing second axial end;a circumferential wall extending between the first and second axial ends, the circumferential wall provided with flow passages for a fluid; a hollow elongate filter medium that is arranged axially on said support tube; wherein said passages are adapted in regard to size; distribution; or size and distribution to a fluidic configuration of said filter element such that non-uniform fluid flows that exist in operation of the filter element upstream of said support tube are compensated; wherein the passages are distributed almost across an entire axial length of the support tube; wherein said passage extend radially through the circumferential wall of the support tube; wherein wall surface of said circumferential wall surrounding said passages is impermeable to the fluid; wherein a ratio of total circumferential opening area of the passages relative to total circumferential surface area of the impermeable wall surface that surrounds the passages decreases progressively from the first end to the second end of the support tube; wherein the total circumferential surface area of the impermeable wall surface that surrounds the passages increases progressively from the first end to the second end of the support tube.