Electrostatic air cleaning apparatus

• US 3,999,964 A
• Filed: 03/28/1975
• Issued: 12/28/1976
• Est. Priority Date: 03/28/1975
• Status: Expired due to Term

• Current Assignee: Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Carrier Corporation (Carrier Global Corporation)
• Inventors: Carr, Allan W.
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US05/563,017
• Time in Patent Office: 641 Days
• Field of Search: 55/124, 55/130, 55/131, 55/132, 55/138, 55/139, 55/147, 55/148, 55/154, 55/497, 55/499, 55/521
• US Class Current: 96/59
• CPC Class Codes: B03C 3/12 characterised by separation of ionising and collecting stations
• CPC Class Codes: B03C 3/155 Filtration

Abstract

An electrostatic air cleaning apparatus having a source of relatively large magnitude electrical voltage. The cell comprises a charged ionizing section and a collecting section comprising a charged grid and a grounded grid sandwiching therebetween a sheet of foraminous filter media. One of the grids is movable relative to the other grid. A single bus bar electrically connects the ionizing section and the charged grid to the source of voltage. The movable grip is positioned with respect to the stationary grid via support surfaces. Retainers maintain the movable grid in its desired position.

Claims

1. Electrostatic air cleaning apparatus comprising:

a source of relatively large magnitude electrical voltage;

a support frame defining an air inlet and an air outlet for an air stream passing through said air cleaning apparatus; and

an electrostatic cell mounted on said support frame and comprising an ionizing section including a plurality of ionizing wires disposed substantially adjacent said apparatus inlet;

a collecting section disposed downstream of said ionizing wires and including first and second grids sandwiching therebetween a sheet of foraminous filter media wherein said grids include a plurality of perforated V-shaped plates having tabs extending outwardly from each end of the legs thereof, and first and second parallel, spaced apart support members having a plurality of spaced apart holes equal in number to the number of said tabs and formed along the axial length thereof for receiving the tabs to connect the plates to the support members; and

a single bus bar in electrical contact with said source of voltage, and being further electrically connected to said ionizing wires, and to a selected one of said grids, with said other of said grids being grounded, whereby a first electrostatic field is generated at said ionizing section to provide a charge on foreign particles entrapped in an air stream moving through said apparatus, and a second electrostatic field is generated at said collecting section of said electrostatic cell to remove said charged foreign particles from said air stream.

2. Electrostatic air cleaning apparatus comprising:

a source of relatively large magnitude voltage;

an electrostatic cell comprising an ionizing section electrically connected to said source of voltage to provide a charge on foreign particles entrapped in an air stream moving through said apparatus; and

a collecting section whereat said foreign particles are removed from said air stream and including first and second grids sandwiching therebetween a sheet of foraminous filter media, a selected one of said grids being electrically connected to said source of voltage, one of said grids being movable relative to said other grid and including a pair of spaced apart supports having a plurality of V-shaped perforated plates connected thereto; and

a support frame defining an air inlet and an air outlet for air passing through said air cleaning apparatus including means defining an opening to permit the movement of said one grid relative to said other grid, and including first and second spaced apart members mounting retainer means for retaining said movable grid in position relative to said other grid, each of said spaced apart members including opposed vertically extending flanges offset inwardly relative to said retainer means to define a space therebetween for receiving corresponding flanges extending from the respective upper and lower ends of the plates connected at the top and bottom of the supports, the flanges on said spaced apart members defining outwardly facing bearing surfaces for positioning said movable grid within said opening.

3. Electrostatic air cleaning apparatus in accordance with claim 2, wherein said V-shaped plates have tabs extending outwardly from each end of the legs thereof, and said spaced apart supports include a plurality of spaced apart holes equal in number to the number of tabs and formed along the axial length thereof for receiving the tabs to connect the plates to the supports.

4. Electrostatic air cleaning apparatus comprising:

a source of relatively large magnitude electrical voltage;

a support frame defining an air inlet and an air outlet for an air stream passing through said air cleaning apparatus;

an electrostatic cell comprising an ionizing section including a plurality of ionizing wires disposed substantially adjacent said inlet of said apparatus; and

a collecting section disposed downstream of said ionizing wires and including first and second grids sandwiching therebetween a sheet of foraminous filter media, one of said grids being electrically connected to said source of voltage, a selected one of said grids being movable relative to said other grid and including a pair of spaced apart supports having a plurality of V-shaped perforated plates connected thereto; and

a single bus bar in electrical contact with said source of voltage, with said ionizing wires, and with a selected one of said grids, with said other of said grids being grounded, whereby a first electrostatic field is generated at said ionizing section to provide a charge on foreign particles entrapped in said air stream entering said inlet of said apparatus, and a second electrostatic field is generated at said collecting section to remove said charged foreign particles from said air stream; and

said support frame including means defining an opening and including first and second spaced apart members mounting retainer means for retaining said movable grid in position relative to said other grid, each of said spaced apart members including opposed vertically extending flanges offset inwardly relative to said retainer means to define a space therebetween for receiving corresponding flanges extending from the respective ends of the plates connected at the top and bottom of the supports, the flanges on said members defining outwardly facing bearing surfaces for positioning said movable grid within said opening.