Air filtration arrangement
AssigneeDonaldson Company, Inc.
InventorsDenis J. Dudrey, Brad Kahlbaugh, Erland D. Anderson
Life of this patent
Estimating the term…
Abstract
Constructions and methods are described for collecting particulate material from gas streams. In certain specifically described air filter arrangements, a first, rigid, filter construction is used in conjunction with a removable and replaceable depth media filter, to form filter media. The preferred arrangement is configured so that the removable and replaceable depth media filter can be removed and replaced, without disengaging the first filter construction from a filter assembly or housing, if desired. Some preferred configurations and materials are described.
Claims26
An air filter arrangement comprising:
- (a) a first construction having an upstream side and an end cap with an outer annular surface;
- (i) said outer annular surface including a beveled ramp portion and a flat portion;
- and
- (b) a removable and replaceable filter of media positioned in covering relation to said first construction upstream side;
- (i) said removable and replaceable filter including a first region of fibrous media therein and a second region of fibrous media therein;
- said first region having a first axial length, and said second region having a second axial length;
- said first axial length being greater than said second axial length;
- (ii) said first region of media covering at least a portion of an outer periphery of the annular surface and at least said flat portion of said outer annular surface;
- and
- (iii) said second region of media covering at least a portion of said ramp portion of said outer annular surface, but not covering said flat portion of said outer annular surface.
An air filter arrangement adapted for filtering particulate matter from incoming air in an engine air intake, the arrangement comprising:
- (a) a first construction having an upstream side;
- and
- (b) a removable and replaceable sleeve filter of media positioned in covering relation to said first construction upstream side;
- said removable and replaceable sleeve filter including:
- (i) an outermost layer of 4.2 ounce/yd.sup.2 polyester depth media having a free state solidity of about 0.8-1.4%;
- (ii) a second layer downstream of said outermost layer;
- said second layer having an efficiency for filtering which is different from said outermost layer;
- and
- (iii) said outermost layer and said second layer being secured together to form a removable and replaceable sleeve filter, said sleeve filter being continuous and without a nonpermanent seam.
Dependencies are inferred from the claim text.