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

A damping structure and moving blade technology, applied to the supporting elements of blades, engine elements, machines/engines, etc., can solve the problem of large frequency dispersion of blades, increase rigidity, ensure tightness, and overcome large frequency dispersion of blades Effect

Inactive Publication Date: 2008-04-09
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 bucket
  • Bucket root platform double wedge shape blocks damping structure of turbine bucket
  • Bucket root platform double wedge shape blocks damping structure of turbine bucket

Examples

Experimental program
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Embodiment Construction

[0019] Referring to Figures 1 to 5, take 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, as shown in Figure 2; if the blade is a group of blades, during processing, A notch 5 with a wedge-shaped cross-section is respectively processed on the side of the blade root platform 3 matching the blade group and the adjacent blade group, a...

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Abstract

The invention discloses a vane-root platform double-wedge damp structure used for a turbine dynamic vane. The invention comprises a dynamic vane consisting of a round-belt, a vane body, a vane-root platform and a vane-root. Gaps are arranged on two circle side faces of the vane-root platform of the vane, and the wedge damp blocks are arranged in the gaps, and an outer end face and a radial face of the wedge damp block are equal in height. When the dynamic vane revolves, one face of the wedge damp block firmly presses an upper surface of the vane-root platform gap under an effect of the centrifugal force, and the other face firmly clings to the wedge damp block of a neighboring dynamic vane, and the positive pressure and the friction force on an interface of the wedge damp block lead the vane to form a damp wreathing structure. The structure can consume the energy of the vibration, and can ease and eliminate the vibration of the vane, and also can enhance the rigidity of the vane-root and reduce the dispersal of the proper frequency of the vane. The structure needs a little manufacturing work, and the manufacturing, assembling and disassembling are convenient. And the structure has good universal property for the quantity of the lock-port vanes, the static-stress strength of the vane and the general size are not increased.

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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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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