B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 39/16 (2006.01) B01D 46/12 (2006.01) B01D 46/24 (2006.01) B01D 46/52 (2006.01) F02M 35/024 (2006.01)
Patent
CA 2259199
A filter arrangement is provided. The filter arrangement generally includes an air filter (12) having an upstream surface (28) with a prefilter (4) positioned thereon. The prefilter preferably includes at least two layers of depth media (34, 35). In preferred systems, the prefilter includes two layers of depth media secured to one another by stitching (37, 40). In certain preferred arrangements disclosed, the prefilter includes an upstream layer of fibrous depth media (34) and a downstream layer of foam depth media (35), with two layers stitched to one another along peripheral edges. The invention also concerns provision of prefilters, and also air filter arrangements which include housings having air filters with prefilters according to the present invention operably positioned therein. Methods of construction and use are also provided.
L'invention concerne un dispositif filtrant qui comprend, généralement, un filtre à air (12) ayant une surface amont (28) sur laquelle est placée un pré-filtre (4). Le pré-filtre comprend, de préférence, au minimum deux couches de support en profondeur (34, 35). Dans des systèmes préférés, le pré-filtre inclut deux couches de support en profondeur fixées ensemble par piqûre (37, 40). Dans certains dispositifs préféres de l'invention, le pré-filtre inclut une couche amont d'un support en profondeur fibreux (34) et une couche aval d'un support en profondeur en mousse (35), les deux couches étant fixées l'une à l'autre par piqûre le long de leur bord périphérique. L'invention concerne également des pré-filtres et des filtres à air complets comprenant des enveloppes et, à l'intérieur desdites enveloppes, des filtres à air et des pré-filtres prêts à l'emploi, selon la présente invention. Sont également décrits des procédés de fabrication et d'utilisation.
Abrahamson Kathleen A.
Boeckermann Thomas A.
Elfstrand James K.
Nepsund Larry R.
Donaldson Company Inc.
Robic
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