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AssigneeAlfa-Laval AB
InventorsKjell Klintenstedt, Torbjörn Larsen, Jan Setterberg, Stefan Szepessy
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The invention refers to a drive unit (1) for a centrifuge rotor (2) of a centrifugal separator. The drive unit (1) includes a drive shaft (3), which is arranged to support said centrifuge rotor (2) and is rotatably journalled around an axis (z) of rotation, a casing (6), which forms an inner space for the drive shaft (3), and a drive motor shaft (9), which is provided outside the casing (6) and connected to the drive shaft (3) by means of a transferring member (11) which extends through a passage (12) in the casing (6). A shielding member (23) is provided inside the casing (6) in such a way that the part of the transferring member (11), which is located inside the casing (6) is shielded from the inner space, wherein the shielding member (23) forms a channel, which extends through the casing (6) and is shielded from the inner space of the casing.
A centrifugal separator comprising a centrifuge rotor (2) and a drive unit (1) for the centrifuge rotor (2), said drive unit (1) comprising a drive shaft (3) arranged to carry said centrifuge rotor (2) and rotatably journalled in at least one bearing member (4) about a substantially vertical axis (z), a casing (6) which delimits an upper space (7) in which the drive shaft (3) and said bearing member (4) are located, a lower space (8) for storing oil, first means (18, 19, 20) arranged to create a flow of air acting with said oil to form an oil mist and to bring this oil mist to flow through said bearing member (4) for cooling and lubricating thereof, and second means (14, 16, 17) arranged to cool said oil mist by transporting a substantial part of said oil mist from an outlet of said bearing member (4) through at least one passage (17) extending in heat transferring contact with a surrounding space outside the casing (6) to the lower space (8).
Dependencies are inferred from the claim text.