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Filter element

  • US 5,169,528 A
  • Filed: 12/20/1990
  • Issued: 12/08/1992
  • Est. Priority Date: 12/29/1989
  • Status: Expired due to Fees
First Claim
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1. A filter element for filtering a fluid medium, said element having an inner space comprising a tubular chamber (17) with an inner peripheral wall and an outer peripheral wall through which walls the medium to be filtered can pass, said chamber having sealing closure elements (14, 15) at its ends and said filter element having an annular filter member (21) through which said fluid medium can flow in an essentially radial manner, said filter member (21) comprising a bulk-material filling of regenerable, filtration-action substances in the form of a particulate and/or fibrous structure, said peripheral walls having a degree of porosity which enables the said fluid medium to pass through them and with a predetermined direction of flow, said peripheral walls holding captive the said bulk material filling, at least one of said peripheral walls being constituted as a wet-resistant support layer for said filter member, and said bulk material filling consisting of auxiliary filter agents which have been carried to and deposited at said one peripheral wall by said fluid medium, said deposited auxiliary filter agents constituting on said one wall, a deep bed filter (21) characterized by decreasing porosity as a result of said predetermined direction of flow, said chamber (17) being disposed inside a filter element frame (11), which is formed in the manner of a filter cartridge and which comprises a perforated core tube (12), a perforated wall tube (13), and said sealing closure elements (14, 15) holding said tubes (12, 13) in position and being secured to at least one of said tubes, the outer one of the said peripheral walls of the chamber (17) being supported on the inner side of the peripheral wall tube (13) and the inner one of said peripheral walls of the chamber (17) being supported on the outer side of the core tube (12), said peripheral walls (18, 19) being connected to the sealing closure elements (14, 15) in a sealed manner.

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