Backwashable filter for fluids

US5554284A · kind A · utility

Assignee

• Filterwerk Mann & Hummel GmbH · DE

Inventors

• Bertram Bartelt · Steinheim, DE
• Peter Gohle
• Wolfgang Schaal · Backnang, DE

Key dates

• Filing date: Jan 11, 1995
• Grant date: Sep 10, 1996
• Expiry date: Jan 11, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2201/184
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A backwashable fluid filter formed with a filter element which is disposed so that it can be rotated about its axis inside the filter housing by a drive mechanism and through which a radial flow passes. A backwashing device is provided which includes a dirt removal channel which extends parallel to the axis of the filter element. When the filter element is backwashed, clean fluid flows back through the filter element, removes dirt particles adhering to the filter element and carries them into the dirt removal channel. In order to pre-clean the filter element, a resiliently mounted stripping device is arranged in front of the backwashing device to remove coarse dirt from the surface of the filter element before it reaches the backwashing device. The filter element is provided with slit-like openings, each of which has a substantially U-shaped configuration and defines a resilient tongue. During backwashing, these resilient tongues have the advantage that they can move out of their normal positions to expand the width of the slit-like openings and facilitate effective cleaning of filter element.