Patent ID: 11890567
Assignee: MANN+HUMMEL GMBH
Field: Chemical engineering (Chemistry)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A filter arrangement, comprising:
a filer element having an oval-shaped cross section, the filter element comprising:
an oval-shaped filter medium surrounding a center axis (MA) of the filter element;
a first end plate arranged on a first axial end of the oval-shaped filter medium;
a second end plate arranged on a second axial end of the oval-shaped filter medium;
wherein the filter medium is a folded filter medium, folded in a zig-zag pattern;
wherein a radially outer surface of the oval-shaped filter medium (4) forms an oval-shaped radially outer face;
wherein the filter element has an incident-flow guard that covers the oval-shaped radially outer face at least partially;

a filter holder having a receiving section having an oval shaped wall surrounding the center axis (MA), the oval shaped wall defining and surrounding an oval-shaped interior space of the receiving section;
wherein the filter element is received into the oval-shaped interior space of the receiving section;
wherein the oval-shaped radially outer face of the oval-shaped filter medium has a largest diameter (b) extending through center axis (MA) to a smallest radius curved section of the oval-shaped radially outer face;
wherein the oval-shaped radially outer face of the oval-shaped filter medium has a smallest diameter (h) extending through center axis (MA) and perpendicular to the largest diameter (b);
wherein a constant radial spacing distance (a) is provided between the oval-shaped radially outer face of the oval-shaped filter medium and the oval shaped wall of the receiving section around the filter element, forming an oval flow space having a constant radial width (a);
a tubular fluid inlet formed on the filter holder having an inlet flow channel oriented perpendicular to the largest diameter (b), the tubular fluid inlet positioned to discharge a fluid directly into a first end of the oval flow space immediately at the smallest radius curved section of the oval-shaped radially outer face, such that the fluid is thereby accelerated to flow helically and tangentially around the oval-shaped radially outer face of the filter element, thereby, separating particles contained in the fluid onto an interior side of the oval-shaped wall of the receiving section with the aid of centrifugal force;

whereby for optimized particle pre-separation, the largest diameter (b) relative to the smallest diameter (h) is between 3:1 and 1.5:1;
wherein the filter element is covered at least partially by an incident-flow guard arranged between the oval-shaped radially outer face of the filter element and the oval flow space, positioned adjacent to where the tubular fluid inlet discharges the fluid into the oval flow space.