| 摘要 |
PURPOSE:To avoid operational inferiority due to the curing of an impregnation liquid or the clogging of piping by curing, by moving the impregnation liquid from an impregnation liquid storage tank to an impregnation tank by evacuating the impregnation tank and releasing vacuum to return the impregnation liquid to the impregnation liquid storage tank. CONSTITUTION:When an impregnation liquid enters an impregnation tank 2, residual air in the impregnation tank 2 is compressed by the impregnation liquid 5 and the force applied to the surface of the impregnation liquid 5 by the pressure A in a storage tank 3 is in keeping with the force applied to the surface of the impregnation liquid 5 by the pressure B of residual air in the impregnation tank 2 and the gravity of the impregnation liquid 5 above the surface in the storage tank 3 and the impregnation liquid 5 remains in the impregnation tank 2. Next, vacuum release vales 10, 14 are simultaneously opened to simultaneously return the impregnation tank 2 and the storage tank 3 to atmospheric pressure and, by controlling the opening degrees of vacuum release valves 10, 14, the liquid level of the impregnation liquid 5 in the impregnation tank 2 can be kept constant. |
