Pocket filter assembly

• US 4,356,011 A
• Filed: 05/26/1981
• Issued: 10/26/1982
• Est. Priority Date: 05/26/1981
• Status: Expired due to Fees

• Current Assignee: American Air Filter Co., Inc. (Daikin Industries Ltd)
• Original Assignee: Allis-Chalmers Energy Incorporated (Archer Ltd.)
• Inventors: Day, Charles E., Putman, William A.
• Primary Examiner(s): Lacey, David L.
• Application Number:
  US06/267,024
• Time in Patent Office: 518 Days
• Field of Search: 55/368, 55/380, 55/381, 55/382, 55/483, 55/484, 55/500, 55/511, 55/DIG. 12, 210/323.2
• US Class Current: 55/368
• CPC Class Codes: B01D 46/02 Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• CPC Class Codes: B01D 46/023 Pockets filters, i.e. multiple bag filters mounted on a common frame
• CPC Class Codes: Y10S 55/12 Pocket type filter

Abstract

A pocket filter cartridge for removing solid particulates from a dirty gas stream including a plurality of sheath-like filter bags suspended from a common header assembly in side-by-side relation. Each of the filter bags includes a plurality of alternating rows of filamentary stays or span stitching spaced across the width of the bag and extending generally parallel to one another along its length so that upon inflation of the bag by the dirty gas stream during use, the stays shape the bag into a plurality of adjacent tube-like sections opening into one another within the bag. The stays in each row are sized to be of a different length than the stays in the rows adjacent to it to alternately vary the thickness of the bag at the juncture of the tube-like sections formed in the bag.

Claims

1. A gaseous fluid filter assembly for removing particulate solids from a dirty gas stream, comprising:

a mounting frame adapted to be secured across the dirty gas stream;

a plurality of sheath-like filter bags mounted within the frame in side-by-side relation, each of said bags including a pair of generally rectangular filter panels forming the sides of the bag and having an open upstream end and a closed downstream end;

first and second stay means interconnecting the filter panels of each bag in spaced relation, said first and second stay means extending generally parallel to one another along the length of each bag and being alternately disposed across substantially its width to shape each bag into a plurality of adjacent tube-like sections which are each of an essentially uniform cross-section throughout the length of each bag and open into one another upon inflation of each bag by the gas stream; and

said first stay means being of a lesser length extending between the filter panels of each bag than said second stay means, so as to alternately vary the thickness of each bag when it is inflated at the junctures of said tube-like sections to minimize interference between the adjacent filter bags while maximizing the surface area of each of the filter panels available to filter the dirty gas stream along substantially the entire length of the bags.

2. The filter assembly according to claim 1, and

said first and second stay means being alternatively positioned across the width of each bag commencing with said first stay means;

and

said bags being oppositely positioned within the frame so that the first stay means of each bag is aligned with the second stay means of the bags adjacent to it.

3. The filter assembly according to claim 1, and

each of said bags having a plurality of spaced side-by-side first stay means extending along the opposite sides of each bag.

4. The filter assembly according to claim 1, and

said frame including means retaining the open end of each bag in a generally elongated rectangular configuration;

and

said first and second stay means being spaced from said frame, said first stay means being spaced a greater distance from the frame than said second stay means to form a smooth transition in the filter panels between the tube-like sections and the frame.

5. The filter assembly according to claim 1, and

said first and second stay means being equally spaced from one another across the width of each bag.

6. The filter assembly according to claim 1, and

said first and second stay means being parallel seams of span stitching extending along the length of each bag.

7. The filter assembly according to claim 6, and

the length of the span stitching forming said first stay means being in the range of 1/2 to 3/4 the length of the span stitching forming said second stay means.

8. The filter assembly according to claim 6, and

the length of the span stitching being relatively uniform along each seam.