Liquid filtration media, filter elements and methods
AssigneeDonaldson Company, Inc.
InventorsDerek O. Jones, Keh B. Dema, Stephen M. Larsen, Mike J. Madsen, Andrew J. Dallas, Yehya A. Elsayed, Chuanfang Yang
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Abstract
A filter and filter media configured and arranged for placement in a fuel stream is disclosed. The filter and filter media allow for filtering of liquid fuels, such as diesel fuel. In certain embodiments the filter media includes a media fiber (such as glass) and a binder fiber (such as bicomponent) that combine to create a media structure having low solidity and relatively low compressibility, and which contain a pore structure that avoids premature fouling of the filter by fuel degradation products.
Claims13
A filter for filtering liquid fuels comprising:
- filter media configured and arranged for placement in a liquid stream, the filter media comprising an upstream media layer and a downstream media layer, the upstream and downstream media layers being distinct from one another, wherein:
- a) the upstream layer containing media fiber having an average diameter of less than 15 microns and a binder fiber having an average diameter greater than the media fiber;
- and
- b) the downstream layer containing media fiber having an average diameter different than the average diameter of the media fiber in the upstream layer;
- wherein the mode pore size of the upstream layer is at least 20 percent greater than the mode pore size of the downstream layer;
- and
- wherein the mean flow pore size of the media in the upstream portion is less than 90 percent of the mean pore flow size of the media in the downstream layer
- wherein the filter is configured so that upon exposure to a fuel stream containing fuel degradation products, the fuel degradation products are primarily retained in the upstream media layer and wherein upon exposure to a fuel stream containing particulate contaminants, the particulate contaminants are primarily retained in the downstream media layer.
A filter comprising:
- filter media comprising an upstream media layer and a downstream media layer, wherein:
- a) the upstream media layer has a pore size distribution geometric standard deviation of greater than 2.5 and comprises media fiber having an average diameter of less than 15 microns;
- b) the downstream layer contains media fiber having an average diameter different than the average diameter of the media fiber in the upstream layer;
- wherein the mode pore size of the upstream layer is at least 40 percent greater than the mode pore size of the downstream layer;
- and
- wherein the mean flow pore size of the media in the upstream layer is less than 90 percent of the mean pore flow size of the media in the downstream layer;
- wherein the filter is configured so that upon exposure to a fuel stream containing fuel degradation products, the fuel degradation products are primarily retained in the upstream media layer and wherein upon exposure to a fuel stream containing particulate contaminants, the particulate contaminants are primarily retained in the downstream media layer.
Dependencies are inferred from the claim text.