Abstract: The ozonizer of this present invention is small in size, and capable of generating highly concentrated ozone with a high (generating) efficiency. A low voltage electrode 29 includes a disc-shaped low voltage electrode main body 29a facing a high voltage electrode 8 and an extension 29b equipped at one side of the low voltage electrode main body 29a, and the extensions are laminated in a plurality of layers on a base 1 via blocks 30, and a coolant inlet portion 42 for supplying coolant to a coolant passage 34, a coolant outlet portion 35 for exhausting coolant from the coolant passage 34 and an ozone gas outlet portion 33 for exhausting ozone gas from the ozone gas passage 36 are formed passing through the extensions 29b and the blocks 30, respectively, in a laminating direction of the discharge cells 28.

Abstract: An ozonizer has a flat plate-shaped low voltage electrode 7, a flat plate-shaped high voltage electrode 3 facing a main surface of the low voltage electrode 7. The ozonizer also has a flat plate-shaped dielectric 5 and a spacer for forming a discharge gap 6 of a thin thickness in a laminating direction provided between the low voltage electrode 7 and the high voltage electrode 3, a high voltage electrode cooling unit 2 for forming a cooling water passage 2c insulated from the high voltage electrode 3 inside the high voltage electrode 3. An alternating voltage is applied between the low voltage electrode 7 and the high voltage electrode 3 and a discharge is produced in the discharge gap 6 injected with oxygen gas to produce ozone gas.

Abstract: An ozonizer has a flat plate-shaped low voltage electrode 7, a first and second high voltage electrode 3-1, 3-2 provided facing the low voltage electrode 7, a first dielectric 5-1 and first spacer provided between the low voltage electrode 7 and the electrode 3-1, a second dielectric 5-2 and a second spacer provided between the electrode 7 and the electrode 3-2. The ozonizer also has a first electrode cooling sheet 1-1 provided facing the electrode 3-1 at a side opposite a first discharge gap 6-1, a second electrode cooling sheet 1-2 provided facing the electrode 3-2 at a side opposite a second discharge gap 6-2, a first thermal conducting/electric insulating sheet 2-1 sandwiched between the first high voltage electrode 3-1 and the first electrode cooling sheet 1-1 and a second thermal conducting/electric insulating sheet 2-2 sandwiched between the second high voltage electrode 3-2 and the second electrode cooling sheet 1-2.