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Combined blade root

A combined, bladed technology that is applied to blade support elements, engine elements, machines/engines, etc. to increase flexibility, adjust quickly and easily, and avoid amplitude

Inactive Publication Date: 2015-09-16
BEIJING HUAQING GAS TURBINE & INTEGRATED GASIFICATION COMBINED CYCLE ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changing the material also requires remanufacturing the entire blade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] combine Figure 1 to Figure 3 As shown, a combined blade root provided by Embodiment 1 of the present invention includes a fixed block 4 and a movable block 3, the top of the fixed block 4 is used to fix the blade body; the lower part of the fixed block 4 has two radial sides The protruding first installation part and the slot 2 opened on the first installation part, the first installation part is used to engage with the wheel through the first working surface 21 on both radial sides; The movable block 3 is movably inserted in the slot 2, and the movable block 3 can be a variety of different elastic moduli, and the movable block 3 with an appropriate elastic modulus is selected according to the frequency-down or frequency-up requirements; the shaft of the fixed block 4 There is a gap between the two sides and the inner wall of the slot 2, and the lower part of the movable block 3 has a second installation part protruding to the two radial sides, and the second installat...

Embodiment 2

[0046] combine Figure 4 to Figure 6 As shown, a combined blade root provided in Embodiment 2 is basically the same in structure as Embodiment 1, and the similarities will not be described in detail. The difference lies in:

[0047] The second working surface 22 is provided with a concave cutting surface than the first working surface 21, and the vibration-damping material 25 is filled in the cutting surface. The vibration-damping material 25 can be damping glue, and the vibration-damping material 25 can also absorb vibration energy to a certain extent, and further realize the adjustment of vibration frequency.

Embodiment 3

[0049] combine Figure 7 to Figure 9 As shown, the combined blade root provided in the third embodiment has basically the same structure as that in the second embodiment, and the similarities will not be repeated, but the difference is:

[0050]The opposite sides of the slot 2 and the axial sides of the movable block 3 are in a gradually retracting structure from top to bottom, that is, the opposite sides of the fixed block 4 and the axial sides of the movable block 3 are in the shape of Inverted dovetail shape, the movable block 3 is installed in the slot 2 that also forms an inverted trapezoidal structure from top to bottom through the gradual retraction structure on both sides of the axial direction from top to bottom. The movable block 3 of the second installation part adjusts the height of the movable block 3 in the slot 2, and then realizes the adjustment of the gap between the two sides of the movable block 3 and the fixed block 4, thereby realizing the adjustment of th...

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Abstract

The invention relates to the technical field of vibration damping of blades or cantilever type rotating structures and provides a combined blade root. The combined blade root comprises a fixed block and a movable block, wherein the top of the fixed block is used for being connected with a blade, the lower portion of the fixed block is provided with a first installation part and an insertion groove formed in the first installation part, a second installation part is arranged on the lower portion of the movable block, the movable block is movably inserted in the insertion groove, a gap is reserved between the movable block and the inner wall of the insertion groove, and both the first installation part and the second installation part are used for being connected with a wheel disc. When vibration is transmitted to a blade root body and the fixed block through the blade, vibration energy is absorbed through friction between the movable block and the fixed block due to the fact that the gap exists between the fixed block and the movable block, resonance between the movable block and the fixed block is avoided, and excessive vibration amplitude of the blade is avoided.

Description

technical field [0001] The invention relates to the technical field of vibration reduction of blade or cantilever rotating structures, and in particular provides a combined blade root. Background technique [0002] Most of the damage accidents (cracks, breakage) of rotating machinery blades are caused by vibration. The rotor blades are subject to strong centrifugal force loads, coupled with the alternating loads caused by the exciting force of the airflow. After a certain period of operation, it is easy to cause vibration fatigue and fatigue cracks. [0003] Vibration frequency is an important parameter in blade design, and it is usually required to have a certain avoidance rate of the integer multiple of the blade natural frequency and operating speed to avoid resonance. The selection of relevant integer multiples is related to factors such as the number of adjacent structures of the blades, the unevenness of the intake air passage, and the structural form of the cylinder....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/30F01D5/26
Inventor 陈海燕刘丙权崔娟袁善虎
Owner BEIJING HUAQING GAS TURBINE & INTEGRATED GASIFICATION COMBINED CYCLE ENG TECH
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