| 摘要 |
Instead of labyrinth seals, ordinary circular cylindrical gaps (10, 18) are provided at the positions to be sealed in the contactless centrifugal seal device for, in particular, radial turbo-machines. By means of swirl fins (12) on shrouds (7) of the rotor (2), vortex flows which rotate like solid bodies along with the rotor (2) are induced in the vortex chambers (11), the rotational motion of the particles of the medium in the radial-axial planes being reduced to a thin boundary layer. By this means, the same pressure gradient appears outside the rotor (2) in the vortex chambers (11) between the gaps to be sealed (10, 18) as appears within the rotor (2) over the length of the vane passages (4) so that leakage flows are prevented.
|
