FILTER MEDIUM AND BREATHER FILTER STRUCTURE
First Claim
Patent Images
1. A breather cap comprising:
- a housing including a first port arrangement and a second port arrangement, the first and second port arrangements configured to enable gas to flow between the first and second port arrangements in a first direction and in a second direction; and
a filter element operably installed within the housing intermediate the first and second port arrangements to enable gas flowing between the first and second port arrangements in either the first or the second direction to flow through the filter element, the filter element including a first media layer and a second media layer, the second media layer including a thermally bonded sheet, the sheet comprising;
(a) about 10 to 90 wt % of a bicomponent binder fiber having a fiber diameter of about 5 to 50 micrometers and a fiber length of about 0.1 to 15 cm; and
(b) about 10 to 90 wt % of a media fiber having a fiber diameter of about 0.1 to 30 micrometers and an aspect ratio of about 10 to 10,000;
wherein the second media layer has a thickness of about 0.1 to 50 mm, a solidity of about 1 to 25%, a basis weight of about 2 to 1000 g-m−
2, a pore size of about 0.2 to 100 micrometers and a permeability of about 0.1 to 500 ft-min−
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Abstract
Thermoplastic bicomponent binder fiber can be combined with other media, fibers and other filtration components to form a thermally bonded filtration media. The filtration media can be used in filter units, such as breather caps. Such filter units can be placed in the stream of a mobile fluid and can remove a particulate and/or fluid mist load from the mobile stream. The unique combination of media fiber, bicomponent binder fiber and other filtration additives and components provide a filtration media having unique properties in filtration applications.
209 Citations
20 Claims
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1. A breather cap comprising:
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a housing including a first port arrangement and a second port arrangement, the first and second port arrangements configured to enable gas to flow between the first and second port arrangements in a first direction and in a second direction; and
a filter element operably installed within the housing intermediate the first and second port arrangements to enable gas flowing between the first and second port arrangements in either the first or the second direction to flow through the filter element, the filter element including a first media layer and a second media layer, the second media layer including a thermally bonded sheet, the sheet comprising;
(a) about 10 to 90 wt % of a bicomponent binder fiber having a fiber diameter of about 5 to 50 micrometers and a fiber length of about 0.1 to 15 cm; and
(b) about 10 to 90 wt % of a media fiber having a fiber diameter of about 0.1 to 30 micrometers and an aspect ratio of about 10 to 10,000;
wherein the second media layer has a thickness of about 0.1 to 50 mm, a solidity of about 1 to 25%, a basis weight of about 2 to 1000 g-m−
2, a pore size of about 0.2 to 100 micrometers and a permeability of about 0.1 to 500 ft-min−
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A filtration system comprising:
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a reservoir configured to retain, release, and receive liquid, wherein releasing the liquid causes influent gas to enter the reservoir, and wherein receiving liquid causes effluent gas to exit the reservoir; and
a breather cap operably installed on the reservoir, the breather cap including a filter element having a first media layer and a second media layer, the first media layer configured to remove moisture from influent gas passing through the breather cap to the reservoir when fluid is released by the reservoir, the second media layer configured to remove and drain fluid mist from effluent gas passing through the breather cap from the reservoir when fluid is received by the reservoir. - View Dependent Claims (16, 17)
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18. A method for filtering gas in a hydraulic system having a reservoir, the method comprising:
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filtering solid particulate from influent gas entering the reservoir using a first media layer of a filter element, wherein the first media layer is an upstream layer for influent gas; and
filtering fluid mist from effluent gas exiting the reservoir using a second media layer of the filter element, wherein the second media layer is an upstream layer for the effluent gas. - View Dependent Claims (19, 20)
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Specification