Oil purification filter
AssigneeSkf Recondoil AB
InventorsTomas Oestberg, Karl Enquist, Thomas Persson
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Abstract
An oil purification filter for purifying a contaminated oil includes a filter body having a first portion and a second portion, where at least the first portion is impregnated with a separation aid. The separation aid is substantially insoluble in the contaminated oil because of its polar properties, and the separation aid is configured to adsorb/absorb contaminating solids or dissolved impurities in the contaminated oil by chemical interactions. The filter body may comprise one or more sheets of cellulose fibers.
Claims21
An oil purification filter for purifying a contaminated oil, the filter comprising:
- a filter body composed of a network of cellulose fibers,
- wherein:
- the filter body has a first portion and a second portion,
- at least the first portion is impregnated with a separation aid,
- the separation aid is substantially insoluble in the contaminated oil because of polar properties of the separation aid,
- the separation aid is formulated to adsorb/absorb contaminating solids and/or dissolved impurities in the contaminated oil by hydrophilic, hydrophobic, and/or charge interactions, and
- the oil purification filter is configured as a filter insert mountable in a filter housing.
An oil purification filter for purifying a contaminated oil, the filter comprising a filter body having a first portion and a second portion, at least the first portion being impregnated with a separation aid, the separation aid being substantially insoluble in the contaminated oil because of polar properties of the separation aid and the separation aid being configured to adsorb/absorb contaminating solids or dissolved impurities in the contaminated oil by chemical interactions;
- wherein the filter body comprises a network of cellulose fibers and wherein the separation aid is bonded to the cellulose fibers in at least the first portion of the filter body;
- wherein the first portion is provided between an inlet of the filter and the second portion and the second portion is provided between an outlet of the filter and the first portion and
- wherein the second portion is not impregnated with the separation aid.
A method for producing an oil purification filter for purifying a contaminated oil, the method comprising:
- providing a filter body that comprises a filter material composed of a network of cellulose fibers, the filter material having a first portion and a second portion;
- impregnating only the first portion of the filter material with a separation aid, the separation aid being (i) a liquid at the temperature at which the impregnation is carried out, (ii) substantially insoluble in the contaminated oil because of polar properties of the separation aid and (iii) formulated to adsorb/absorb contaminating solids and/or dissolved impurities in the contaminated oil by hydrophilic, hydrophobic, and/or charge interactions;
- and
- disposing the filter body in a filter housing in an orientation such that the first portion of the filter material is disposed between an inlet of the filter housing and the second portion of the filter material, and the second portion of the filter material is disposed between an outlet of the filter housing and the first portion of the filter material, wherein the second portion of the filter material is not impregnated with the separation aid.
Dependencies are inferred from the claim text.