Patent ID: 6869575

Claim:
An ozonizer comprising: a plurality of discharge cells, each discharge cell comprising a disk-shaped high voltage electrode, a low voltage electrode facing the high voltage electrode via a discharge gap and including a coolant passage at an inner portion thereof, a dielectric contacting one of said high voltage electrode and said low voltage electrode and a spacer provided in said discharge gap for maintaining said discharge gap, said discharge cells being laminated in a plurality of layers, wherein when an alternating voltage is applied between said high voltage electrode and said low voltage electrode and causes a discharge in said discharge gap, oxygen gas passing inside said discharge gap from a peripheral portion of said high voltage electrode toward a central portion of said discharge gap is converted to ozone gas, and the ozone gas is led to an ozone gas passage, an end of the gas ozone passage meeting with said central portion of said discharge gap and extending in a radial direction inside said low voltage electrode, said low voltage electrode comprising a disc-shaped low voltage electrode main body facing said high voltage electrode and an extension provided at one side of said low voltage electrode main body, extensions of a plurality of said low voltage electrode are laminated in a plurality of layers on a base via a blocks; and a coolant inlet portion for supplying coolant to said coolant passage, a coolant outlet portion for exhausting coolant from said coolant passage, and an ozone gas outlet portion for exhausting ozone gas from said ozone gas passage, passing through said extensions and said blocks, respectively, in a laminating direction of said discharge cells.