| 摘要 |
The worm screw is short with a blunt head and a blunt backflow blocking arrangement, together with an impeller body and torpedo. The torpedo has various modules variable in position. The torpedo has an accommodation bar (7) with a point (8) and an end (10) provided with a screw thread (9). Socket-shaped modules (11, 12, 13) can be pushed onto the accommodation bar and fixed by an end piece (14) provided with an internal screw thread. The axially freely movable torpedo in the cylinder has one or more modules, the external diameter of which coincides with the internal diameter of the cylinder. The surface of a module is provided with diamond-shaped ridges (15) |
