Apparatus for generating ozone

Apparatus for generating ozone comprising top and bottom chambers interconnected by an elongate tubular assembly the axis of said assembly being generally vertical, wherein said assembly includes an elongate electrode concentrically located within but spaced apart from an annular elongate conductive member, a concentric elongate annular dielectric being disposed in and partly filling the space between the electrode and the conductive member so as to define annular passageway means for flow of gas between said top and bottom chambers, said elongate annular dielectric being mounted only by being suspended on a resilient member at its upper end within the top chamber whereby the electric field established, in use, between the electrode and the conductive member tends to center the dielectric, the dielectric being dimensioned diametrically so that when centered it is free from contact with both the electrode and the conductive member, whereby the dielectric is free to expand and contract under thermal and vibration stresses and is relatively easily replaced, and said passageway means is formed by radially inner and outer annular passageways respectively formed between the electrode and the dielectric and between the dielectric and the conductive member.