Air cleaning device

An air cleaning device comprising:

• a high-voltage pulse generator having an output electrode;
• an outer electrode shaped as a metal tube;
• and
• an inner electrode that is at least as long as the metal tube, wherein the inner electrode is spaced by a gap from the output electrode of the high-voltage pulse generator, wherein the gap is located outside the metal tube,
• wherein the outer electrode is grounded,
• wherein the inner electrode is shaped as a metal rod and is rigidly secured along an axis of the metal tube using an auger that is electrically connected to the inner electrode and secured on a portion of the inner electrode inside the outer electrode, wherein a surface of a blade of the auger is formed by a metal strip, and an outer edge of the metal strip is attached to the outer electrode and is electrically insulated from the outer electrode,
• wherein the inner and outer electrodes are configured so that pulsed corona discharge streamers are formed in between the inner and outer electrodes, and
• wherein a size of the gap assures breakdown of the gap with pulses formed by the high-voltage pulse generator.