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Bucket root platform double wedge shape blocks damping structure of turbine blades

A damping structure and moving blade technology, applied in the directions of blade support elements, engine elements, machines/engines, etc., can solve the problems of large frequency dispersion of blades, increase rigidity, overcome large frequency dispersion of blades, and reduce blade roots. The effect of the possibility of fatigue failure

Inactive Publication Date: 2009-11-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure can solve the problem of large frequency dispersion of the blade caused by the looseness of the blade root, improve the structural damping of the blade, and enhance the safety and reliability of the blade

Method used

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  • Bucket root platform double wedge shape blocks damping structure of turbine blades
  • Bucket root platform double wedge shape blocks damping structure of turbine blades
  • Bucket root platform double wedge shape blocks damping structure of turbine blades

Examples

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Embodiment Construction

[0019] see Figure 1 to Figure 5 , taking the T-shaped blade root as an example for the following description:

[0020] The blade root platform double-wedge block damping structure of the moving blade of the present invention comprises a shroud 1, a blade body 2, a blade root platform 3, a blade root 4, and a wedge-shaped damping block 6 installed in a gap 5 on the blade root platform 3. The moving blade, which is an important part of the turbine to realize energy conversion, is fixed on the impeller or rotor body 7 through the blade root 4 .

[0021] If the blade is a free blade, during processing, a notch 5 with a wedge-shaped cross-sectional shape is respectively processed on the two circumferential sides of each blade root platform 3, see figure 2 As shown; if the blade is a group of blades, during processing, a notch 5 with a wedge-shaped cross-sectional shape is respectively processed on the side of the blade root platform 3 matching the blade group and the adjacent bl...

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Abstract

The invention discloses a double wedge block damping structure of a blade root platform of a turbine moving blade, comprising a moving blade composed of a shroud, a blade body, a blade root platform and a blade root. There is a wedge-shaped damping block in the gap, and the outer end surface of the wedge-shaped damping block is flush with the radial surface; when the moving blade rotates, one surface of the wedge-shaped damping block is pressed against the upper surface of the gap of the blade root platform under the action of centrifugal force. The other surface is close to the wedge-shaped damping block on the adjacent moving blade, and the positive pressure and friction on the contact surface of the wedge-shaped damping block make the blade form a damping ring structure. The structure can consume the energy of vibration, slow down and eliminate the vibration of the blade, increase the rigidity of the blade root, and reduce the dispersion of the natural frequency of the blade caused by the installation deviation. The processing volume is small, the processing, assembly and disassembly are convenient, the number of locking blades, and the static stress level and overall size of the blades are not increased, and it has good versatility.

Description

technical field [0001] The invention relates to a turbine moving blade, in particular to a double-wedge block damping structure of a blade root platform of a turbine moving blade, which includes a double-wedge damping block mounted on the blade root platform, which is used to increase the stiffness of the blade root and reduce the inherent stiffness of the blade. The dispersion of frequency reduces and slows down the vibration of the blade. Background technique [0002] The blade mounted on the rotor is an important part of the turbine to achieve energy conversion. A typical blade includes a blade body, a blade root platform, a blade root, and shrouds or tie bars. The blade is fixed on the rotor through the blade root. For high-pressure blades, the diameter of the rim increases due to the high temperature during operation and the centrifugal force of the blade and impeller, resulting in loosening of the blade root contact surface, and the size of this looseness depends on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D5/10F01D5/26F01D5/30
Inventor 徐自力徐朝蓉席光和赛南
Owner XI AN JIAOTONG UNIV
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