ROTOR DEVICE FOR A VACUUM PUMP, AND VACUUM PUMP
A rotor device for a vacuum pump comprises a rotor shaft and at least one rotor element on the rotor shaft. The rotor element contains aluminum, titanium and/or CFRP, while the rotor shaft contains a chromium-nickel steel. This makes it in particular possible to join the at least one rotor element to the rotor shaft at room temperature using a pressing process.
1 . Rotor device for a vacuum pump, comprising
a rotor shaft and
at least one rotor element arranged on the rotor shaft,
wherein
the at least one rotor element contains aluminum, titanium and/or CFK and the rotor shaft contains chromium-nickel steel.
2 . Rotor device for a vacuum pump of claim 1 , wherein the at least one rotor element is made of aluminum, an aluminum alloy and/or high-strength aluminum.
3 . Rotor device for a vacuum pump of claim 1 , wherein the at least one rotor element is made of titanium and/or a titanium alloy.
4 . Rotor device for a vacuum pump of claim 1 , wherein the at least one rotor element is made of CFK.
5 . Rotor device for a vacuum pump of claim 1 , wherein the rotor shaft contains a chromium-nickel steel with added sulfur.
6 . Rotor device for a vacuum pump of claim 1 , wherein the rotor shaft contains a stainless steel alloy.
7 . Rotor device for a vacuum pump of claim 1 , wherein the material pair is selected such that the at least one rotor element can be fitted on the rotor shaft at room temperature.
8 . Rotor device for a vacuum pump of claim 1 , wherein a plurality of said rotor elements are arranged in the longitudinal direction of the rotor shaft.
9 . Rotor device for a vacuum pump of claim 6 , wherein the rotor elements are formed as rotor discs.
10 . Rotor device for a vacuum pump of claim 8 , further comprising at least one spacer element is arranged between two of the rotor elements.
11 . Vacuum pump, in particular a turbomolecular pump, comprising
a rotor device for a vacuum pump of claim 1 ,
the rotor shaft being supported in a pump housing by bearing elements,
a driver connected to the rotor shaft, and
at least one stator element arranged in the pump housing.
12 . Rotor device for a vacuum pump of claim 6 , wherein the stainless steel alloy is stainless steel X8CrNiS18-9.