CONCENTRATOR SYSTEM FOR PARTICULATES SUSPENDED IN AIR

• US 3,864,106 A
• Filed: 07/18/1973
• Issued: 02/04/1975
• Est. Priority Date: 07/18/1973
• Status: Expired due to Term

• Current Assignee: Borg Textile Corporation
• Original Assignee: Robert E. Brandt
• Inventors: Brandt, Robert E.
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US05/380,320
• Time in Patent Office: 566 Days
• Field of Search: 55/96,97,1,286-288,319,321,324,334,335-337,341,461,418,430,DIG.37,350,473
• US Class Current: 55/288
• CPC Class Codes: B01D 46/04 Cleaning filters
• CPC Class Codes: B01D 46/71 with pressurised gas, e.g. pulsed air
• CPC Class Codes: D04B 35/32 Devices for removing lint or fluff

Abstract

Air carrying particulate matter in suspension enters horizontal plenum at high velocity; bag filters along top of plenum are connected through openings the aggregate cross sectional area of which is much greater than the cross sectional area of the plenum, so that velocity of air rising into bags is relatively low. Plenum has gradual reduction of cross section so that horizontal air velocity through it is substantially uniform along its length, keeping particles entrained, sweeping them along the smooth bottom and through the outlet. Momentary interruption of inlet air reduces pressure in bags, allowing partial collapse which causes trapped particles to fall into plenum, from which they are discharged when air flow is restored. Connection of the discharge outlet of one such unit into the inlet of a second unit, in addition to the normal input load of the second unit, reduces the proportion of the ultimate particlebearing exhaust in terms of the input to the two units.

Claims

1. A concentrator system for particulate matter suspended in air including intake piping for collecting particulate matter, a fan for moving air through said piping, a filter unit comprising a plenum receiving from said fan air and particulate matter entrained therein, said plenum being formed by a duct having an inlet at one end for horizontally moving air and an outlet at the other end, substantially smaller than said inlet, for horizontally moving air, and a plurality of apertures along the top wall of said duct between said inlet and said outlet, for vertically moving air, and a plurality of filter bags communicating with and connected to said apertures, the cross section area of said plenum being uniformly reduced from the inlet to the outlet thereof, in two sections, the first section being of uniform width, and of uniform gradation in height, and the second section being of uniform height and uniform gradation in width.

2. A concentrator system in accordance with claim 1, further including means whereby the air moving effect of said fan can be momentarily and repeatedly reduced to cause a pulsation of static pressure within said plenum.

3. A concentrator system for particulate matter suspended in air including intake piping for collecting particulate matter, a fan for moving air through said piping, a filter unit comprising a plenum receiving from said fan air and particulate matter entrained therein, said plenum being formed by a duct having an inlet at one end for horizontally moving air and an outlet at the other end, substantially smaller than said inlet, for horizontally moving air, and a plurality of apertures along the top wall of said duct between said inlet and said outlet, for vertically moving air, said apertures each opening into a filter bag, and said fan being a centrifugal type adjoining said inlet and being so arranged that the outer periphery of the scroll casing thereof is at the bottom of its outlet and is connected to the bottom of the inlet of said duct whereby particulate matter centrifugally thrown to the outer portion of said scroll casing by the operation of said fan is introduced at the bottom of said duct, and moves from the inlet to the outlet of said duct along the bottom thereof.

4. In an air filter system wherein a flow of air in a duct carries particulate matter which is to be removed from the air, a filter unit comprising a plenum formed by a duct extending substantially horizontally between opposite ends, having an inlet at one end into which air bearing particulate matter is introduced, an outlet at the other end leading to a collection chamber, the area of said outlet being approximately one tenth of the area of said inlet, a bottom therebetween sufficiently smooth for particulate matter to be swept therealong to and through said outlet by said air, and a plurality of apertures in the top wall thereof, having an aggregate area at least 10 times the area of said inlet, and a plurality of filter bags connecting with said apertures.

5. In an air filter system wherein a flow of air in a duct carries particulate matter which is to be removed from the Air, a filter unit comprising a plenum formed by a duct extending substantially horizontally between opposite ends, having an inlet at one end into which air bearing particulate matter is introduced, an outlet at the other end leading to a collection chamber, a bottom therebetween sufficiently smooth for particulate matter to be swept therealong to and through said outlet by said air, and a plurality of apertures in the top wall thereof, and a plurality of filter bags connecting with said apertures, the vertical velocity of air rising through said apertures being less than 400 feet per minute when a horizontal air velocity of 4,000 feet per minute is maintained in said plenum.

6. In an air filter system wherein a flow of air in a duct carries particulate matter which is to be removed from the air, a filter unit comprising a plenum formed by a duct extending substantially horizontally between opposite ends, having an inlet at one end into which air bearing particulate matter is introduced, an outlet at the other end leading to a collection chamber, a bottom therebetween sufficiently smooth for particulate matter to be swept therealong to and through said outlet by said air, and a plurality of apertures in the top wall thereof, and a plurality of filter bags connecting with said apertures, said duct having a first section of uniform width and of uniform gradation in height, and a second section of uniform height and uniform gradation in width.

7. A concentrator system for particulate matter suspended in air including intake piping for collecting particulate matter, a fan for moving air through said piping, a filter unit comprising a plenum receiving from said fan air and particulate matter entrained therein, said plenum being formed by a duct having an inlet at one end for horizontally moving air and an outlet at the other end, substantially smaller than said inlet, for horizontally moving air, and a plurality of apertures along the top wall of said duct between said inlet and said outlet, for vertically moving air, and a plurality of filter bags communicating and connecting with said apertures, the cross section area of said plenum being uniformly reduced from the inlet to the outlet thereof, said piping being directed vertically, with a downward flow of air, adjacent to said filter unit, and entering said filter unit through means receiving the downward flow of air and discharging it horizontally into said plenum.