Axial positioning structure for firtree type blade root and blade
An axial positioning, fir tree-shaped technology, applied in the direction of blade support components, engine components, machines/engines, etc., can solve the problems of complex axial positioning structure, cumbersome assembly, and difficult processing
Active Publication Date: 2009-06-17
DONGFANG TURBINE CO LTD
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Problems solved by technology
The current axial positioning structure is complex, difficult to process, and cumbersome to assemble
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[0017] see figure 1 , figure 2 , image 3 : The blade root 3 of the blade is inlaid in the wheel groove of the impeller 1, and on the end faces of the impeller 1 and the blade root 3 on the same side, the position corresponding to the radial mating surface of the impeller and the blade root is provided with an annular stop spanning the impeller and the blade root A bit groove, the annular stop groove is concentric with the impeller, and a plurality of arc-shaped stop blocks 2 are inlaid in the groove, and all the arc-shaped stop blocks are combined into a circle along the circumferential direction.
[0018] The cross-sectional shape of the arc stop block 2 can be a dovetail shape, such as figure 2 As shown, it can also be T-shaped, such as image 3 shown.
[0019] The number of stop blocks 2 can be flexibly set depending on the size. If the number is too large, the processing will be cumbersome, and if the number is too small, the weight will be too heavy and the assembl...
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The invention discloses an axial positioning structure for a fir-shaped blade base and a blade. The blade base of the blade is embedded in a wheel groove of a blade wheel; on the homolateral end faces of the blade wheel and the blade base, an annular stop slot horizontally crossing the blade wheel and the blade base is arranged on radial matching surfaces corresponding to the blade wheel and the blade base, wherein, the annular stop slot is eccentric to the blade wheel, and a plurality sections of arc-shaped stop blocks are embedded in the slot, and the arc-shaped stop blocks are totally combined into a ring along a circumferential direction. The stop slot is provided with a section of opening, and the arc width of the opening is equal to that of the stop block; part of the stop block is a section of locking stop block, which is composed by a combination of a semi-stop block, a pressure plate and screw nails; the semi- stop block is embedded in the stop slot and is pressed by the pressure plate, and the pressure plate and the semi- stop block are fixedly connected by the screw nails. The axial positioning structure for the fir-shaped blade base and the blade has the technical effects of simple structure, accurate and reliable positioning, easy processing of the stop slot and the stop block and convenient assembly.
Description
technical field [0001] The invention relates to a moving blade of a steam turbine rotor, in particular to an axial positioning structure of a fir-tree type blade root blade. Background technique [0002] Due to its special geometric shape, the fir-tree blade root is evenly stressed and can withstand large loads. It is currently the most reasonable force bearing among various types of blade roots. It is usually used for high-speed water pump small unit rotors and high-power The last stage and the second last stage of the steam turbine rotor. [0003] Since the fir tree blade root is installed into the impeller groove from the axial direction, an axial positioning structure is required to avoid axial movement of the blade when the unit is running. The current axial positioning structure is complex, difficult to process, and cumbersome to assemble. Contents of the invention [0004] The purpose of the present invention is to overcome the shortcomings of the existing axial p...
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IPC IPC(8): F01D5/32
Inventor 袁永强余宏才杨灵赵卫军曾娅孙敏张晓东吴其林周显丁范小平曹守洪江生科
Owner DONGFANG TURBINE CO LTD