| 摘要 |
PURPOSE:To suppress the deterioration of an outer peripheral surface layer part made of rubber by preventing oil deterioration, by coating the silicone oil liquid surface in a silicone oil tank with an inert gas layer. CONSTITUTION:An isolated chamber 7a is opened and closed by lids 10, 10 and a gas jet nozzle 12 is confronted to the interior of a tank while a gas exhaust port 13 is connected to the outside of the tank. Inert gas sent through a gas jet nozzle 12 is sucked from the exhaust port 13 to be successively recovered to the side of a gas supply source while the space between a ceiling part and an oil liquid surface is always filled with the inert gas stream and the oxidation of silicone oil 8 by the atmosphere is suppressed. Therefore, the frequent exchange of the oil becomes unnecessary and the deterioration of rubber forming the outer peripheral surface layer part can be also prevented together with the prevention of oil deterioration. |
