US 5,700,304 AGranted

Filter with protective shield

AssigneeDonaldson Company, Inc.

InventorChong-Kim Foo

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Abstract

A filter element is provided. The filter element generally includes a first liner, a region of filter media positioned downstream from the first liner and a screen arrangement positioned along a portion of the first liner downstream surface and oriented to block a portion of the first liner to flow directly therethrough and into a portion of the filter media directly associated therewith. Preferred elements are generally cylindrical, having expanded metal outer and inner liners with pleated paper media positioned therebetween. The preferred screen arrangement includes a polymeric sleeve, partially embedded in one of the end caps. Also according to the invention an overall filter arrangement or assembly is provided. Such an assembly includes the filter element as well as a housing and a precleaner arrangement.

Claims11

Dependent claims

A filter arrangement comprising:

(a) a housing;
(b) a removable and replaceable cylindrical filter element operably positioned in said housing for filtering of air passing therethrough;
said filter element comprising:
(i) a first liner having regions open to passage of air therethrough;
said first liner having an upstream surface and a downstream surface;
(ii) a region of filter media positioned downstream from said first liner;
and
(iii) a screen arrangement positioned along a portion of said first liner downstream surface;
said screen arrangement being substantially impervious to air flow through any portion thereof;
and said screen arrangement being positioned to block said portion of said first liner to air flow therethrough and into a portion of said region of filter media;
and,
(c) a precleaner arrangement including:
(i) a tangential air inlet constructed and arranged to direct air flow into said housing in a circular pattern around said filter element;
and,
(ii) a particulate collection chamber;
(d) said screen arrangement including a portion aligned with said tangential air inlet to inhibit air from passing into said air filter element without first passing in a circular flow at least partially around said filter element.

13 more elements

Dependencies are inferred from the claim text.