Recirculation filter for an electronic enclosure
A filter assembly for use in an electronic enclosure is provided. The filter assembly includes a highly permeable scrim that defines an elongate enclosure with an inlet at a first end and a closed second end, wherein an electrostatic filtration media is disposed within the elongate enclosure.
1. A filter assembly for use in an electronic enclosure, the filter assembly comprising:
a media structure including a substantially open front face, a closed rear face, and an internal recess between the open front face and closed rear face;
a scrim material forming at least a portion of the media structure; and
an electrostatic material disposed within the internal recess of the filter assembly, the electrostatic material at least partially covering the scrim.
2. The filter assembly of claim 1 , wherein the scrim material comprises a woven material.
3. The filter assembly of claim 1 , wherein the scrim material comprises a non-woven material.
4. The filter assembly of claim 1 , wherein the scrim material comprises polypropylene fibers.
5. The filter assembly of claim 1 , wherein the scrim material has a permeability of between about 100 ft./min. at 0.5 inches of water and about 800 ft./min. at 0.5 inches of water.
6. The filter assembly of claim 1 , wherein the internal recess of the filter assembly has a ratio of maximum length to maximum diameter of the open front face of at least 1.0.
7. The filter assembly of claim 1 , wherein the internal recess of the filter assembly has an internal surface area that is at least 2 times the area at the open front face.
8. The filter assembly of claim 1 , wherein at least 50 percent of the surface area of the internal recess has an angle to the opening that is less than or equal to 45 degrees.
9. The filter assembly of claim 1 , wherein at least 50 percent of the surface area of the internal recess has an angle to the opening that is less than or equal to 30 degrees.
10. The filter assembly of claim 1 , wherein the filter assembly comprises a plurality of structures including an open front face, a closed rear face, and a plurality of internal recesses between the open front face and closed rear face.
11. A filter assembly for use in an electronic enclosure, the filter assembly comprising:
a media structure including a substantially open front end, a closed rear end, and a plurality of internal recesses between the open front face and closed rear face;
a scrim material forming at least a portion of the internal recesses; and
an electrostatic material disposed within the internal recesses of the filter assembly, the electrostatic material at least partially covering the scrim.
12. The filter assembly of claim 11 , wherein the scrim material comprises woven material.
13. The filter assembly of claim 11 , wherein the electrostatic material has a filtering efficiency of about 20% to about 99.99% for 20 to 30 micron particulate contaminants.
14. The filter assembly of claim 11 , wherein at least one of the plurality of internal recesses has a ratio of maximum length to maximum diameter of the open front face of at least 1.0.
15. The filter assembly of claim 11 , wherein at least one of the plurality of internal recesses has an internal surface area that is at least 2 times the area at the open front face.
16. The filter assembly of claim 11 , wherein at least one of the plurality of internal recesses has an internal surface area that is at least 4 times the area at the open front face.
17. The filter assembly of claim 11 , wherein at least one of the plurality of internal recesses has an internal surface area that is at least 6 times the area at the open front face.
18. The filter assembly of claim 11 , wherein at least 50 percent of the surface area of at least one internal recess has an angle to the opening that is less than or equal to 45 degrees.
19. The filter assembly of claim 11 , wherein at least 50 percent of the surface area of at least one internal recess has an angle to the opening that is less than or equal to 30 degrees.
20. A disk drive assembly, the disk drive assembly comprising:
(a) a disk drive housing that defines an enclosure;
(b) at least one disk rotatably mounted within the enclosure, wherein rotation of the at least one disk induces airflow within the enclosure; and
(c) a filter assembly disposed within the enclosure, wherein the filter assembly comprises:
a media structure including a substantially open front face, a closed rear face, and an internal recess between the open front face and closed rear face;
a scrim material forming at least a portion of the media structure;
an electrostatic material disposed within the internal recess of the filter assembly, the electrostatic material at least partially covering the scrim material.