Reversible Blade Damper Asymmetric Lug Design
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Solution Overview
Problem
Conventional turbine blade damper seals often fail to secure properly due to incorrect orientation, leading to inadequate positioning of the circumferentially extending foot and radial reaction surfaces, resulting in improper assembly and potential vibration issues.
Innovation Solution
The damper body is designed with a mirrored configuration, featuring a pair of radial reaction shoulders on each lateral side and a pair of feet that can be installed in either orientation, ensuring that at least one foot is received in a blade pocket and the radial reaction shoulders remain functional even if the damper is installed 180° out of position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damper is designed with a single orientation (conventional design), then the structure is simpler, but the damper may be incorrectly installed 180° out of position, leading to improper securing and malfunction
Solution Approach 1:
The damper is designed with asymmetric features including a circumferentially extending foot on one lug and radial reaction shoulders positioned specifically on certain lateral sides. This asymmetric configuration ensures that only one orientation allows proper engagement with blade pockets and posts, preventing incorrect 180° installation while maintaining structural simplicity
Solution Approach 2:
The design inverts the conventional approach by making the damper body itself asymmetric rather than relying on external installation fixtures. The asymmetric foot and shoulder positioning creates inherent orientation guidance, so the damper physically cannot be installed incorrectly, eliminating the need for complex alignment mechanisms
2Ease of manufacture
If the damper uses a single foot and single radial reaction shoulder, then the structure is simpler, but incorrect orientation causes the foot to miss the blade pocket and the shoulder to miss the post
Solution Approach 1:
The damper incorporates asymmetric positioning of the circumferentially extending foot and radial reaction shoulders relative to the damper body axes. This asymmetric arrangement ensures that in the correct orientation, the foot aligns with the blade pocket and the shoulder engages the post, while incorrect orientation prevents engagement, providing foolproof securing
Data Source
Figure 1A~1D
Figure 2
Figure 3A~3B
AI summary
A damper body extends between an axial first end, an opposing axial second end, a first lateral side, and an opposing second lateral side. A first pair of lugs are disposed at the first axial end and a second pair of lugs are disposed at the second axial end. In the first lug pair, a lug has an axially outermost foot which extends laterally beyond a lateral wall. The second lug pair has a lug with an axial outermost point with a foot extending laterally beyond a lateral wall. The foot on the first axial end and the foot on the second axial end are on opposed lateral sides.