Air filter with a primary air outlet and a secondary air outlet as well as filter element therefor

US11415089B2 · kind B2 · utility

Assignee

• MANN+HUMMEL GmbH · DE

Inventors

• Daniel Schmid · Sachsenheim, DE
• Matthias Krohlow · Ludwigsburg, DE
• Martin Sonntag · Kirkland, US
• Steffen Pfannkuch · Ludwigsburg, DE
• Martin Schmid · Hamburg, DE
• Christoph Wittmers · Bietigheim-Bissingen, DE
• Robert Hasenfratz · Hessental, DE

Key dates

• Filing date: Feb 2, 2021
• Grant date: Aug 16, 2022
• Expiry date: May 10, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2279/60
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A filter element has a filter medium folded in a star shape that surrounds annularly a longitudinal axis of the filter element and is flowed through radially from exterior to interior. The filter element has a primary air passage and a secondary air passage. In the filter medium, a cutout is formed that penetrates a plurality of folds of the filter medium. A passage socket at which the secondary air passage is formed extends through the cutout. An air filter provided with a filter housing having a raw air inlet, a primary air outlet, and a secondary air outlet, has such a filter element that separates in the filter housing a raw side communicating with the raw air inlet from a clean side. The primary air outlet communicates through the primary air passage and the secondary air outlet through the secondary air passage with the clean side, respectively.