Axial positioning structure for firtree type blade root and blade
An axial positioning, fir-tree-shaped technology, applied in the direction of blade support elements, engine elements, machines/engines, etc., can solve the problems of difficult processing, complex axial positioning structure, and cumbersome assembly.
Active Publication Date: 2010-12-29
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
Method used
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[0017] See figure 1 , figure 2 , image 3 : The blade root 3 of the blade is embedded in the groove of the impeller 1. On the same side end surface of the impeller 1, the blade root 3, the position corresponding to the radial matching surface of the impeller and the blade root is provided with an annular stop across the impeller and the blade root. Position groove, the annular stop groove is concentric with the impeller, and a plurality of arc-shaped stop blocks 2 are embedded 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 may 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 set flexibly depending on the size. If the number is too large, the processing will be cumbersome. If the number is too small, the weight will be too heavy and assembly will be laborious. General...
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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-shaped root blade. Background technique [0002] Because of its special geometric shape, the fir-tree roots are uniformly stressed and can withstand larger loads. It is the most reasonable force among various types of roots. It is usually used for high-speed feedwater pump rotors and high-power small units. The last stage and the second last stage of the steam turbine rotor. [0003] Since the fir-tree blade roots are inserted into the impeller wheel groove from the axial direction, an axial positioning structure is required to avoid axial movement of the blades during the operation of the unit. The current axial positioning structure is complicated, the processing is difficult, and the assembly is cumbersome. Summary of the invention [0004] The purpose of the present invention is to overcome the shortcomings of the existing axial...
Claims
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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