| 摘要 |
A housing defines a chamber for foam consisting of a gaseous and liquid phase. A rotatable shaft extends from the exterior to the interior of the housing; the portion located in the interior of the housing is in form of a tubular hollow shaft portion connected with the remainder of the shaft which extends to the exterior of the housing and is of solid cross section. The portion of the shaft of solid cross-section is gas-tightly surrounded by a stationary conduit and an annular sealing element of elastomeric material is either fast with the conduit in the interior of the housing and has a lip which engages the sealing surface on the rotatable hollow tubular shaft portion, or is fast with the hollow tubular shaft portion and has a lip which engages a sealing surface on the stationary conduit, in either case in sliding relationship. Foam-breaking elements are carried for rotation by the hollow tubular shaft portion and define with one another gaps extending radially of the latter and communicating with the interior of the hollow tubular shaft portion, with the interior in turn communicating with the space between the conduit and the solid cross-section shaft portion so that gaseous phase separated from the liquid phase by the foam-breaking elements can escape from the housing in this manner.
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