Joints and connections – Utilizing thermal characteristic – e.g. – expansion or...
Reexamination Certificate
2000-07-17
2001-08-21
Kim, Harry C. (Department: 3629)
Joints and connections
Utilizing thermal characteristic, e.g., expansion or...
C403S030000, C403S273000
Reexamination Certificate
active
06276863
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a friction- and form-grip connection of rotating components. Such connections are used, for example, for joining together rotor disks of gas turbines subjected to high thermal loading.
2. Discussion of Background
The rotor of a turbomachine generally consists of a plurality of rotor disks, which are lined up axially next to each another and concentrically oriented. These rotor disks are fastened to one another by one or more tie rods and thus form a compact unit. For the operation of a turbomachine, it is necessary that the rotors have very high axial rigidity and centering (true running), i.e. that no unsteady states, vibrations or eccentric running due to displacements in the center of gravity can arise in the various operating states. This despite the unavoidable, different coefficients of thermal expansion of the different materials used. In order to avoid such misalignments of the rotor parts relative to one another, radial serrations may be arranged on the end faces of the rotor disks. The production of the same, however, is very expensive and requires high-precision machines. Other measures, such as short spigots etc. have been unable to prevent, in practice, misalignment of the rotor parts relative to one another and thus untrue running, which may lead to the destruction of rotor and stator.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention, in attempting to avoid all of these disadvantages, is to provide a novel friction and form-grip connection of rotating components which is designed in such a way or can be retrofitted in such a way that an operationally induced maladjustment (twisting or displacement) of components relative to one another is avoided.
In the case of a connection of the type mentioned at the beginning, this is achieved by the defining features of the patent claim. Further features and advantages follow from the subclaims.
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Alkelin Harry
Fryklund Mikael
Nilsson Roland
Thornblad Per
Wettstein Hans
Asea Brown Boveri AG
Burns Doane Swecker & Mathis L.L.P.
Kim Harry C.
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