Abstract: There is provided an ozone generating apparatus that requires no use of cooling water, is small in size and easy in maintenance. The ozone generating apparatus includes a ground electrode 1 formed of a substantially cylindrical metal tube, and a high voltage electrode 5 having a substantially cylindrical dielectric body substantially concentrically arranged inside the ground electrode, and having a high voltage applied to an electrically conductive layer 6 formed on an inner peripheral surface thereof, in which an oxygen-containing gas is supplied into an electric discharge gap formed between the ground electrode and the high voltage electrode to generate ozone, wherein the ground electrode is formed integrally with plural air cooling fins 2 extending in a longitudinal direction at an outer peripheral side thereof.

Abstract: There is provided an ozone generating apparatus that requires no use of cooling water, is small in size and easy in maintenance. The ozone generating apparatus includes a ground electrode 1 formed of a substantially cylindrical metal tube, and a high voltage electrode 5 having a substantially cylindrical dielectric body substantially concentrically arranged inside the ground electrode, and having a high voltage applied to an electrically conductive layer 6 formed on an inner peripheral surface thereof, in which an oxygen-containing gas is supplied into an electric discharge gap formed between the ground electrode and the high voltage electrode to generate ozone, wherein the ground electrode is formed integrally with plural air cooling fins 2 extending in a longitudinal direction at an outer peripheral side thereof.

Abstract: An exhaust gas diffuser to be connected to the discharge end of an exhaust pipe of an engine, having a tubular body of a relatively flattened cross-sectional shape and having opposite open axial ends, wherein the discharge end of the exhaust pipe is connected to one of the open opposite ends while the openings left at opposite sides of the discharge end of the exhaust pipe form first external air inlet ports, wherein second external air inlet ports are provided at opposite flattened wall portions of the tubular body with upstream edges of the second external air inlet ports being obliquely bent inwardly so as to define a throttling nozzle, while the other open axial end of the tubular body forms an exhaust port through which exhaust gases discharged from the exhaust pipe are discharged mixed with air entrained principally through the second external air inlet ports.