CN101285401B - Firtree -type bucket root steam turbine rotor blades and its locking notch vane - Google Patents
Firtree -type bucket root steam turbine rotor blades and its locking notch vane Download PDFInfo
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- CN101285401B CN101285401B CN2008100446375A CN200810044637A CN101285401B CN 101285401 B CN101285401 B CN 101285401B CN 2008100446375 A CN2008100446375 A CN 2008100446375A CN 200810044637 A CN200810044637 A CN 200810044637A CN 101285401 B CN101285401 B CN 101285401B
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Abstract
The invention provides a fir-tree type blade root rotor blade of a steam turbine and a stepped blade thereof. The rotor blade comprises an overall structure of a blade shroud, a blade body and a blade root which is provided with a root-type part and an intermediate part, wherein the intermediate part is shaped like a Chinese character 'tu', the width of a lug boss is equal to the width of the prior blade root intermediate part in the same specification, the width of a pedestal is more than the width of the lug boss, the width of the root-type part is equal to the width of the pedestal; the stepped blade comprises a stepped rotor blade and an adjacent stepped rotor blade both of which comprise the blade root, and the blade root is provided with a standard stopping piece and a blade axial positioning structure; the blade axial positioning structure is: a vertical slot is arranged on an opposite fitting plane between the pedestal of the blade root intermediate part of the stepped rotor blade and the pedestal of the blade root intermediate part of the adjacent stepped rotor blade, in which a vertical stopping part is arranged; a vertical slot and a level slot are arranged on the opposite fitting plane between the pedestal of the blade root intermediate part of the adjacent stepped rotor blade and the blade root intermediate part of the stepped rotor blade, wherein the level slot corresponds to the waist part of the vertical slot. The structure does not damage the root type part, but improves the security of blades and has high positioning accuracy.
Description
Technical field
The present invention relates to steam turbine blade, relate in particular to the steam turbine blade and the fore shaft blade thereof of fir-tree root.
Background technique
The Control Stage of Steam Turbine moving vane, the governing stage moving vane of large steam turbine particularly, because high temperature, load and partial admission etc. are all multifactor greatly, the operating conditions very severe, its Security especially attracts people's attention, not only require the various piece of blade that enough intensity is arranged, and require blade root to pack into behind the impeller in conjunction with firmly.But, the moving vane of fir-tree root, the root type part of its blade root is partly compared with the root type of other form blade, and the physical dimension that seems is little, and intensity is lower, and Security is relatively poor.In addition, because molded lines complications, the complexity of fir-tree root, machining accuracy is difficult to guarantee that the race molded lines of blade root molded lines and impeller always has error, behind the impeller of packing into, the Percent of contact area of fitting surface can not be very high, there is the gap, in conjunction with not really firm, during blade vibration, to reach impeller down, cause whole rotor oscillation.
Have again,, bring difficulty, present design that two kinds of concrete modes are arranged for the axial positioning structure design of fore shaft blade because the physical dimension of blade root is little.A kind of is to establish the axially locating bar between blade root bottom and impeller, as shown in Figure 1, on the positioning strip 5 boss is arranged, and embeds in the cross groove of blade root bottom surface, realizes the blade axially locating.But mill groove in the blade root bottom surface, injure molded lines, reduced the intensity of blade root.Another kind as shown in Figure 2, on the blade root intermediate line of engagement of fore shaft blade and fore shaft adjacent blades, establish screw, screw 7, realize the blade axially locating, process very inconvenient, if processing screw hole in advance, be difficult to when then assembling guarantee the alignment of two halves screw, if the reprocessing of assembling back screw, then inefficiency.
Summary of the invention
Purpose of the present invention provides a kind of steam turbine blade and fore shaft blade thereof that does not have the fir-tree root of above-mentioned shortcoming.
Technical solution of the present invention is:
A kind of fir-tree root steam turbine blade, have integrally-built integral shroud, blade and blade root, described blade root has root type part and intermediate part, described intermediate partly is " protruding " shape, its top is boss, and the bottom is a pedestal, and the width of boss equals the width of traditional fir-tree type blade root intermediate, the width of pedestal is greater than the width of boss, and the width of root type part equals the width of pedestal.
Described fir-tree root steam turbine blade, this blade comprises a pair of fore shaft blade and remaining common blade, this is that fore shaft moving vane, another are the adjacent moving vanes of fore shaft to one in fore shaft blade, standard stop bit spare and blade axial positioning structure are arranged on their blade root, and described axial positioning structure is:
-on the fitting surface in opposite directions of fore shaft moving vane blade root intermediate pedestal and adjacent moving vane blade root intermediate pedestal, be provided with vertical groove, adaptive vertical stop bit spare is arranged in the groove;
-on the fitting surface in opposite directions of adjacent moving vane blade root intermediate pedestal and fore shaft moving vane blade root intermediate pedestal, be provided with vertical groove and horizontal slot, the waist of the corresponding vertical groove of horizontal slot, the combination of two grooves is " fourth " word shape, and its vertical groove is corresponding with the vertical groove of fore shaft moving vane, and notch in opposite directions; Adaptive horizontal stop bit spare is arranged in the horizontal slot.
Useful technique effect of the present invention:
1. after the axial dimension of blade root strengthened, the structural strength after self intensity and the assembling had all improved, and combine more firmly with impeller, and the vibration characteristics of blade is greatly improved, and can not pass to impeller down when vibrating, and the vibration characteristics of whole rotor also is enhanced.
2. after the axial dimension of blade root strengthened, the blade root intermediate had bigger surface area, for the rational more fore shaft moving vane position structure of design has been created locality condition.
3. fore shaft moving vane position structure is arranged on blade root intermediate position, no longer injures root type part, the Security that has improved blade.
4. position structure adopts groove, piece cooperating structure, the Location accuracy height, and process, assemble easy.
Description of drawings
Fig. 1 is a kind of axial positioning structure figure of existing fir-tree root fore shaft blade
Fig. 2 is the another kind of axial positioning structure figure of existing fir-tree root fore shaft blade
Fig. 3 is the structural drawing of Firtree-type bucket root rotor blades of the present invention
Fig. 4 is fore shaft blade structure of the present invention and assembling relationship figure
Fig. 5 is the A-A view of Fig. 4
Fig. 6 is the C-C view of Fig. 5
Fig. 7 is an I enlarged view local among Fig. 6
Fig. 8 is the K-K view of Fig. 6
Embodiment
Referring to Fig. 3: Firtree-type bucket root rotor blades has integral shroud 1, blade 2, blade root intermediate 3, blade root 4, and they are overall structures, and wherein, the axial width of blade root intermediate 3 is L.The axial width of the blade root intermediate 3 of traditional blades is L
1, characteristics of the present invention are, blade root intermediate 3 is designed to the boss shape, the width of upper boss is L
1, equaling the width of the blade root intermediate of traditional blades, the width of lower stage is L
2, L
2＞L
1, the width of blade root 4 also is L
2, the size of blade root intermediate 3, blade root 4 has all been amplified, and correspondingly, the width of impeller also is increased to L
2This improved purpose has two, and the first, the structural strength after blade root 4 self intensity and the assembling all improves, and combine more firmly with impeller, and the vibration characteristics of blade is greatly improved, and can not pass to impeller down when vibrating, and the vibration characteristics of whole rotor also is enhanced; The second, blade root intermediate 3 has bigger surface area, for the rational more fore shaft moving vane position structure of design is created locality condition.
Referring to Fig. 4 to Fig. 8: the fore shaft blade comprises fore shaft blade 10 and fore shaft adjacent blades 20, there is the standard position-arresting groove at the back side of fore shaft adjacent blades 20 blade root intermediates, and standard stop bit spare 60 is arranged in the groove, and this part is that conventional construction is original, the present invention still adopts, and does not add change.Characteristics of the present invention are the fitting surfaces in opposite directions that fore shaft blade axial positioning structure are arranged on two blade root intermediates, and concrete structure is:
-on the fitting surface in opposite directions of fore shaft moving vane 10 blade root intermediate pedestals and adjacent moving vane 20 blade root intermediate pedestals, be provided with vertical groove, adaptive vertical stop bit spare 30 is arranged in the groove;
-on the fitting surface in opposite directions of adjacent moving vane blade root intermediate pedestal and fore shaft moving vane blade root intermediate pedestal, be provided with vertical groove and horizontal slot, the waist of the corresponding vertical groove of horizontal slot, the combination of two grooves is " fourth " word shape, and its vertical groove is corresponding with the vertical groove of fore shaft moving vane 10, and notch in opposite directions; Adaptive horizontal stop bit spare 40 is arranged in the horizontal slot.
Installation step is:
1. when pretending adjacent moving vane 20, earlier standard stop bit spare 60 is packed in its position-arresting groove, again this blade is put in the race of impeller 50;
2. in the vertical groove of adjacent moving vane 20 of vertical stop bit spare 30 being packed into;
3. fore shaft moving vane 10 is put in the race of impeller 50;
4. stir vertical stop bit spare 30, it is moved in the vertical groove of fore shaft moving vane 10;
5. horizontal stop bit spare 40 is injected in the horizontal slot of adjacent moving vane 20.
At this moment, assembling promptly comes to an end, and all blades all are positioned on the impeller 50 and are locked, and are axially located, and the axial float dislocation can not take place.
Said structure no longer injures root type part, the Security that has improved blade, and position structure adopts groove, piece cooperating structure, and the Location accuracy height, and processing, assembling are all very easy.
Claims (2)
1. fir-tree root steam turbine blade, have integrally-built integral shroud, blade, blade root, described blade root has root type part and intermediate part, it is characterized in that: described intermediate partly is " protruding " shape, its top is boss, and the bottom is a pedestal, and the width of boss equals the width of traditional fir-tree type blade root intermediate, the width of pedestal is greater than the width of boss, and the width of root type part equals the width of pedestal.
2. fir-tree root steam turbine blade according to claim 1, it is characterized in that: this blade comprises a pair of fore shaft blade and remaining common blade, this is that fore shaft moving vane, another are the adjacent moving vanes of fore shaft to one in fore shaft blade, standard stop bit spare and blade axial positioning structure are arranged on their blade root, and described axial positioning structure is
-on the fitting surface in opposite directions of fore shaft moving vane blade root intermediate pedestal and adjacent moving vane blade root intermediate pedestal, be provided with vertical groove, adaptive vertical stop bit spare is arranged in the groove;
-on the fitting surface in opposite directions of adjacent moving vane blade root intermediate pedestal and fore shaft moving vane blade root intermediate pedestal, be provided with vertical groove and horizontal slot, the waist of the corresponding vertical groove of horizontal slot, the combination of two grooves is " fourth " word shape, and its vertical groove is corresponding with the vertical groove of fore shaft moving vane, and notch in opposite directions; Adaptive horizontal stop bit spare is arranged in the horizontal slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100446375A CN101285401B (en) | 2008-06-03 | 2008-06-03 | Firtree -type bucket root steam turbine rotor blades and its locking notch vane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100446375A CN101285401B (en) | 2008-06-03 | 2008-06-03 | Firtree -type bucket root steam turbine rotor blades and its locking notch vane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101285401A CN101285401A (en) | 2008-10-15 |
| CN101285401B true CN101285401B (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100446375A Active CN101285401B (en) | 2008-06-03 | 2008-06-03 | Firtree -type bucket root steam turbine rotor blades and its locking notch vane |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840457B (en) * | 2010-05-07 | 2012-07-04 | 上海交通大学 | Method for reconstructing residual stress field of profile of large-dimension fir-type blade wheel groove |
| CN103628928B (en) * | 2013-11-29 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Fir blade root final blade axial direction positioning structure |
| CN105927585B (en) * | 2016-06-02 | 2018-05-22 | 东方电气集团东方汽轮机有限公司 | A kind of axial positioning structure of compressor blade in impeller race |
| CN110296105A (en) * | 2019-08-15 | 2019-10-01 | 上海电气燃气轮机有限公司 | Blade locking mechanism |
| CN113510396B (en) * | 2021-08-13 | 2024-10-01 | 哈尔滨汽轮机厂有限责任公司 | Moving blade positioning and clamping device and laser cladding repairing method for blade crown water erosion area |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5567116A (en) * | 1994-09-30 | 1996-10-22 | Gec Alsthom Electromecanique Sa | Arrangement for clipping stress peaks in a turbine blade root |
| US5737816A (en) * | 1995-06-02 | 1998-04-14 | Asea Brown Boveri Ag | Device for the mounting of rotating blades |
| CN2809222Y (en) * | 2005-07-31 | 2006-08-23 | 东方汽轮机厂 | Big loading fir-tree blade root and wheel groove structure for steam turbine |
| CN100335749C (en) * | 2002-05-24 | 2007-09-05 | Abb涡轮系统有限公司 | Axial securing means for impeller blades |
-
2008
- 2008-06-03 CN CN2008100446375A patent/CN101285401B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5567116A (en) * | 1994-09-30 | 1996-10-22 | Gec Alsthom Electromecanique Sa | Arrangement for clipping stress peaks in a turbine blade root |
| US5737816A (en) * | 1995-06-02 | 1998-04-14 | Asea Brown Boveri Ag | Device for the mounting of rotating blades |
| CN100335749C (en) * | 2002-05-24 | 2007-09-05 | Abb涡轮系统有限公司 | Axial securing means for impeller blades |
| CN2809222Y (en) * | 2005-07-31 | 2006-08-23 | 东方汽轮机厂 | Big loading fir-tree blade root and wheel groove structure for steam turbine |
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| Publication number | Publication date |
|---|---|
| CN101285401A (en) | 2008-10-15 |
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