Rotor fixture for a friction vacuum pump
AssigneeLeybold Vakuum GmbH
InventorsGünter Schütz, Christian Beyer, Ralf Adamietz, Dieter Haas
Life of this patent
Estimating the term…
Abstract
A friction pump (1), such as turbomolecular pump, includes a steel housing (2) in which a steel shaft (15) is supported by a bearing (16). A rotor (4) with a central bore (21) is mounted on the shaft. In order to reduce the risk of the joint area between the rotor and the shaft becoming loose, a ring groove (26, 31) which encompasses the joint area between the rotor is provided in an area adjacent at least one of the faces of the rotor. A reinforcing ring (34, 35, 38) of a high strength, low thermal expansion material encompasses one of a thrust member (28) and cylindrical rotor sections (32, 37) adjacent the shaft.
Claims13
A friction pump comprising:
- a housing;
- a shaft which is supported in the housing by bearings;
- a rotor which has a central borehole and which is mounted onto the shaft in an area of said borehole;
- and,
- a ring groove that encompasses a joint area between the rotor and the shaft provided in an area of at least one of front and rear faces of said rotor, the ring groove being limited by an inner and an outer rotor section, the inner rotor section, including a reinforcing ring made of a high strength material with small thermal expansion.
A turbomolecular vacuum pump comprising:
- a stator supported in a housing;
- a shaft rotatably mounted to the housing and disposed within the stator;
- a rotor rotatably received in the stator, the rotor including:
- a central well in a high vacuum face of the rotor,
- a projecting portion extending from an inner end of the central well, the projecting portion having a conical surface at an outer end thereof,
- a bore extending from a low vacuum face of the rotor, through the rotor and centrally through the projecting portion;
- a thrust ring received on the shaft and having a conical inner surface that is received on the projecting portion conical surface, an innermost face of the thrust ring being displaced from the inner end of the central well.
A friction pump comprising:
- a housing;
- a shaft supported in the housing by bearings;
- a rotor having an inner rotor section and an outer rotor section, a central bore hole being defined through the inner rotor section, the shaft extending into the bore hole and being connected with the inner rotor section, the rotor having a ring groove defined in at least one of front and rear faces of the rotor, the ring groove being limited by the inner and outer rotor sections;
- a reinforcing ring disposed in the ring groove surrounding a portion of the inner rotor section between the central bore hole and the ring groove to reinforce the portion of the inner rotor sections.
Dependencies are inferred from the claim text.