| 摘要 |
A device is provided (19) for conversion between two conditions, i.e. a first in which the water lock pervents air flow from the unit exterior to the outflow conduit parts and a second in which a connection permitting air flow is formed between the unit exterior and the outflow conduit parts. The device comprises a water lock-forming insert (19) which can be selectively either set in the outflow conduit or unit for converting the unit to the first condition or removed from the outflow conduit or unit for conversion to the second condition. An air vacuum producing component is connected to the outflow conduit parts (20) and the unit is formed so that in the second condition it functions as an output air component. Components (23) are provided for releasable, airtight all-round connection of the insert (19) with wall parts in the unit or outflow conduit in the first condition. |
