Fuel filter
A fuel filter has a housing having an intake and an outlet. A filter element is arranged in the housing such that a filtered area is separated seal-tightly from an unfiltered area. A flow passage is provided between the unfiltered area and the filtered area. A porous filter member closes off the flow passage, wherein the porous filter member is arranged seal-tightly on a wall arranged about the flow passage. The filter element has a filter medium and a geodetically upper and a geodetically lower terminal disks arranged at end faces of the filter medium. The filter medium is connected seal-tightly to the terminal disks. The flow passage is arranged in the geodetically upper terminal disk that forms the wall.
1. Fuel filter comprising:
a housing having an intake and an outlet;
a filter element arranged in the housing such that a filtered area is separated seal-tightly from an unfiltered area, the filter element including
an annularly closed filter medium that is fluid flow permeable and having an upper axial end face and a lower axial end face, the annularly closed filter medium filtering fluid flowing through the annularly closed filter medium; and
an upper and a lower terminal disk connected seal-tightly onto the upper and lower axial end faces, respectively, of the annularly closed filter medium, the upper and lower terminal disks seal off the upper and lower axial end faces, respectively, of the annularly closed filter medium from fluid flow,
the upper and lower terminal disks connected seal-tightly onto respective upper and lower axial end faces of the annularly closed filter medium, such that the annularly closed filter medium is sealed off from fluid flow at its upper and lower axial end faces by the upper and lower terminal disks,
wherein the upper terminal disk includes:
a fuel outlet opening in the upper terminal disk through which a fuel stream of filtered fuel exits an interior of the filter element, the fuel outlet opening fluidically connected to the outlet of the housing,
an annular sealing projection arranged on an axially outer side of the upper terminal disk, spaced radially outwardly away from the fuel outlet opening, and circumferentially encircling the fuel outlet opening of the upper terminal disk, the annular sealing projection projecting axially outwardly away from the upper terminal disk,
the annular sealing projection having a plurality of axial flow openings formed into the annular sealing projection and distributed circularly about a circumference of the fuel outlet opening, the plurality of axial flow openings having a first end opening into the interior of the filter element,
a porous filter member arranged on the annular sealing projection and covering the plurality of axial flow openings, and filtering fluid flowing through the plurality of axial flow openings;
a securing ring arranged on the annular sealing projection and encircling the fuel outlet opening;
wherein the securing ring has a plurality of securing ring openings extending therethrough, the plurality of securing ring openings forming a continuation of the plurality of axial flow openings of the annular sealing projection,
wherein the porous filter member is sandwiched between the securing ring and the annular sealing projection.
2. Fuel filter according to claim 1 , wherein the porous filter member is comprised of the same material as the annularly closed filter medium of the filter element.
3. Fuel filter according to claim 1 , wherein the porous filter member is comprised of a sintered material.
4. Fuel filter according to claim 3 , wherein the sintered material is a ceramic material.
5. The fuel filter according to claim 1 ,
wherein the outlet of the housing includes an outlet bush projecting into the interior of the filter element through the annular sealing projection of the upper terminal disk;
wherein the upper terminal disk includes a seal ring, the seal ring compressed at opposing axial sides between the upper terminal disk and the securing ring;
wherein the securing ring seals against the annular sealing projection on a radially outer side and the outlet bush on an opposing radially inner side.
6. A filter element arrange in a filter housing such that a filtered area is separated seal-tightly from an unfiltered area, the filter element is annularly closed, the filter element including
an annularly closed filter medium that is fluid flow permeable and having an upper axial end face and a lower axial end face, the annularly closed filter medium filtering fluid flowing through the annularly closed filter medium; and
an upper and a lower terminal disk connected seal-tightly onto the upper and lower axial end faces, respectively, of the annularly closed filter medium, the upper and lower terminal disks seal off the upper and lower axial end faces, respectively, of the annularly closed filter medium from fluid flow,
wherein the upper terminal disk includes:
a fuel outlet opening in the upper terminal disk through which a fuel stream of filtered fuel exits an interior of the filter element;
an annular sealing projection arranged on an axially outer side of the upper terminal disk, spaced radially outwardly away from the fuel outlet opening, and circumferentially encircling the fuel outlet opening of the upper terminal disk, the annular sealing projection projecting axially outwardly away from the upper terminal disk,
the annular sealing projection having a plurality of axial flow openings formed into the annular sealing projection and distributed circularly about a circumference of the fuel outlet opening, the plurality of axial flow openings having a first end opening into the interior of the filter element, and
a porous filter member arranged on the annular sealing projection and covering the plurality of axial flow openings, and filtering fluid flowing through the plurality of axial flow openings,
a securing ring arranged on the annular sealing projection and encircling the fuel outlet opening;
wherein the securing ring has a plurality of securing ring openings extending therethrough, the plurality of securing ring openings forming a continuation of the plurality of axial flow openings of the annular sealing projection,
wherein the porous filter member is sandwiched between the securing ring and the annular sealing projection.