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US 11,642,612 B2Granted
Filter element having two filter media
AssigneeRobert Bosch GmbH
InventorsJan Otahal, Reinhard Taferl, David Ayza Parra, Jose Luis Arias Arias, Miguel Martinez Gomez, Miguel Castejon Lopez, Sara Diaz Manzanero
Life of this patent
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Abstract
A filter element includes an unfiltered side via which a fluid is able to be introduced, and a filtered side via which fluid is able to be output, and first and second filter mediums that are situated between the unfiltered and filtered sides, where the first filter medium has a lower relative pressure loss than the second filter medium in a flow direction of the fluid from the filtered side to the unfiltered side.
Claims12
A filter element comprising:
- an unfiltered side via which a fluid is able to be introduced;
- a filtered side via which the fluid is able to be output;
- a first filter medium arranged between the unfiltered and filtered sides;
- and
- a second filter medium arranged between the unfiltered and filtered sides and having a higher relative pressure loss than the first filter medium in a flow direction of the fluid from the filtered side to the unfiltered side,
- wherein the first filter medium is a surface filter, and the second filter medium is a depth filter,
- wherein during a normal operation, the second filter medium is configured for primarily filtering out particles present in the fluid,
- wherein the second filter medium is operable in a reverse operation in which a pumping direction is reversed, which causes the fluid to primarily flow through the first filter in a return flow direction,
- wherein the second filter medium has a surface that is exposed to the unfiltered side of the filter element that is larger than a surface of the first filter medium that is exposed to the unfiltered side,
- wherein the first filter medium has a planar surface, and the second filter medium has a zigzag shaped surface.
7 more elements
A filter module comprising:
- a housing;
- and
- in the housing, a filter element that includes:
- an unfiltered side via which a fluid is able to be introduced;
- a filtered side via which the fluid is able to be output;
- a first filter medium arranged between the unfiltered and filtered sides;
- and
- a second filter medium arranged between the unfiltered and filtered sides and having a higher relative pressure loss than the first filter medium in a flow direction of the fluid from the filtered side to the unfiltered side,
- wherein the first filter medium is a surface filter, and the second filter medium is a depth filter, wherein during a normal operation, the second filter medium is configured for primarily filtering out particles present in the fluid, and
- wherein the second filter medium is operable in a reverse operation in which a pumping direction is reversed, which causes the fluid to primarily flow through the first filter in a return flow direction,
- wherein the second filter medium has a surface that is exposed to the unfiltered side of the filter element that is larger than a surface of the first filter medium that is exposed to the unfiltered side,
- wherein the first filter medium has a planar surface, and the second filter medium has a zigzag shaped surface.
9 more elements
Dependencies are inferred from the claim text.