Air cleaning device and apparatus

1. An air cleaning device for removing aerosol particles from an air stream, the device comprising:

(a) a particle charger comprising a housing and an electrode arrangement therein for generating air ions in the air stream, the particle charger having a particle charging zone within which, in use, aerosol particles in the air stream are electrically charged via collision with the air ions;

(b) a filter for precipitating electrically charged aerosol particles from the air stream moving through the device; and

(c) an air mover, comprising a casing as a separate component from the housing, for moving the air stream through the device;

wherein the particle charger and the air mover are provided upstream of the filter; and

wherein the housing of the particle charger is hermetically sealed to the casing of the air mover in the direction of air flow through the device, such that the particle charger and the air mover are intimately coupled together to provide a minimum 99.9% particle removal efficiency, whereby essentially all air entering the device has to pass through both the particle charger and the air mover.

2. The air cleaning device according to claim 1 , wherein the particle charger is upstream of the air mover.

3. The air cleaning device according to claim 1 , wherein the particle charger is down stream of the air mover.

4. The air cleaning device according to claim 1 , wherein the filter is an electrostatic filter, an electrostatic precipitator, a fibrous media filter, or an electret filter.

5. The air cleaning device according to claim 1 , wherein the air mover is a mechanical fan, bellows, a convective airflow device, a centrifugal fan, or a blower.

6. The air cleaning device according to claim 1 , wherein the electrode arrangement comprises two parts: an electrode and a counter-electrode.

7. The air cleaning device according to claim 6 , wherein the particle charger comprises both the electrode and the counter-electrode.

8. The air cleaning device according to claim 6 , wherein the electrode is in the form of a pin or elongate wire, having a tip or an end.

9. The air cleaning device according to claim 8 , wherein the electrode of the particle charger is supported on a support rod.

10. The air cleaning device according to claim 9 wherein two or more pin-type electrodes are supported on a common conductor rod.

11. The air cleaning device according to claim 6 , wherein the counter-electrode surrounds the electrode but is separated therefrom by a clearance.

12. The air cleaning device according to claim 11 , wherein the electrode is substantially concentric with the counter-electrode.

13. The air cleaning device according to claim 6 , wherein the counter-electrode is comprised of a plate having an aperture therein.

14. The air cleaning device according to claim 6 , wherein the counter-electrode comprises a hollow cylinder formed of conductive material or having a conductive interior surface.

15. The air cleaning device according to claim 14 , wherein the conductive interior surface is comprised of a conductive ink or paint.

16. An air cleaning method for removing aerosol particles from an air stream and eliminating charge bypass, the method comprising:

generating air ions in the air stream using a particle charger comprising a housing and an electrode arrangement therein;

electrically charging aerosol particles in the air stream via their collision with air ions in a particle charging zone of the particle charger;

moving the air stream towards a filter using an air mover comprising a casing as a separate component from the housing, whereby electrically charged aerosol particles in the air stream are precipitated onto the filter,

using a hermetic seal between the housing of the particle charger and the casing of the air mover in the direction of air flow, such that the air stream is moved through an intimate couple of the particle charger and the air mover to provide a minimum 99.9% particle removal efficiency, whereby all air to be cleaned has to pass through both the particle charger and the air mover, prior to its arrival at the filter.