CN101349169A - Full level steam turbine short movable vane without frequency modulation - Google Patents
Full level steam turbine short movable vane without frequency modulation Download PDFInfo
- Publication number
- CN101349169A CN101349169A CNA2008100460669A CN200810046066A CN101349169A CN 101349169 A CN101349169 A CN 101349169A CN A2008100460669 A CNA2008100460669 A CN A2008100460669A CN 200810046066 A CN200810046066 A CN 200810046066A CN 101349169 A CN101349169 A CN 101349169A
- Authority
- CN
- China
- Prior art keywords
- blade
- kinds
- blades
- steam turbine
- blade root
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses an untuned short moving blade of a whole-stage steam turbine. A plurality of the short moving blades are assembled on an impeller to form the whole stage; each short blade is provided with a blade body, a blade root and a blade crown which have an integral structure; the blade root is provided with a molded line part and a midbody part; the stage blade is divided into two kinds; the molded line parts of the blade roots of two kinds of the blades have different heights; and two kinds of the blades are arranged at intervals on the impeller; clearance is reserved between the midbodies of the blade roots of two kinds of the blades; the blade crown is provided with a damping structure; and the blade root is an axial mounting type blade root. Through adjusting the relative difference of the inherent frequencies of two kinds of the blades, namely controlling the length difference of the dimensions L of the blade roots, the response and dynamic stress of the whole system are controlled within the safe range.
Description
Technical field
The present invention relates to the whole level of steam turbine moving vane, relate in particular to the short moving vane of whole level steam turbine of untuned.
Background technique
Steam turbine is a kind of energy conversion, and it is a mechanical energy with thermal power transfer.Turbine blade is the core component in the steam turbine conversion process of energy, and especially the design quality of moving vane is most important for the Security of steam turbine.
In fact exhausted major part of the damage of moving vane all is owing to the excessive generation of dynamic stress.For guaranteeing the safe operation of steam turbine blade, the dynamic stress in the time of must the work of control moving vane, fitness for purpose is avoided presumable excitation force frequency scope with the natural frequency of blade, promptly transfers and opens resonance.Even as damping vane, the dynamic stress in the time of also reducing its work of avoiding resonating, thus improve the margin of safety of moving vane.But, for short frequency-modulating blade (typically referring to the steam passage height below 200mm), because blade is shorter, root connects rigidity, factor such as shear force and rotary inertia is very big to the influence of the blade natural frequency of vibration, so its vibration is difficult to calculate accurately, its vibration characteristics is to be difficult to hold.
Summary of the invention
Purpose of the present invention, the whole level steam turbine that provides a kind of untuned is lacked moving vane.Avoid resonating and realize by improving leaf and root structure.
Technical solution of the present invention is:
A kind of whole level steam turbine of untuned is lacked moving vane, is assemblied in by many short moving vanes to constitute whole level on the impeller, and described short blade has integrally-built blade, blade root, integral shroud, and blade root has molded lines part and intermediate part; It is characterized in that this grade blade is divided into two kinds, the blade root molded lines part of two kinds of blades is highly different, two kinds of alternate being arranged on the impeller of blade.
Leave the gap between the blade root intermediate of described two kinds of blades.
Described integral shroud has damping structure.
Described blade root is axial loading type blade root.
Useful technique effect of the present invention:
In the whole grade blade system of this structure, even if the moving vane of half (blade A or blade B) natural frequency and excitation force frequency resonate, but second half blade (blade A or blade B) does not always resonate.And arrange from blade, every its adjacent moving vane of blade that is in resonance state is not to be in resonance state, so excitation force absorbs the part of the resonance blade intake blade that will do not resonated, some energy is owing to damping dissipates.Can not increase to some extent though be not in the blade amplitude of resonance state, with regard to whole level system, the blade dynamic stress is reduced greatly.So, can be by adjusting the natural frequency relative difference of two kinds of blades, just control blade root size L length difference and control the response of whole system and dynamic stress within safety range.
Description of drawings
Fig. 1 is a blade A structural representation
Fig. 2 is that the P of Fig. 1 is to view
Fig. 3 is a blade B structural representation
Fig. 4 is that the K of Fig. 3 is to view
Fig. 5 is race structural representation (axial view)
Fig. 6 is the enlarged view of local I among Fig. 5
Fig. 7 is a blade impeller assembly structure schematic representation
Fig. 8 is the enlarged view of local N among Fig. 7
Fig. 9 is the enlarged view of local M among Fig. 7
Embodiment
Referring to Fig. 7: the moving vane 20 of steam turbine is contained on the impeller 10.
Referring to Fig. 1 to Fig. 4: blade 20 has blade 1, blade root 2, integral shroud 3, and the three is an overall structure.Wherein, blade root 2 has blade root molded lines part 2.1 and intermediate part 2.2, and two-part are overall structures.The height dimension of blade root molded lines part 2.1 is L.
Main feature of the present invention is: blade 20 is designed to two kinds, i.e. A, B, and these two kinds of blades are except that the height dimension L difference of blade root 2 molded lines parts 2.1, and remaining part is identical.Fig. 1, Fig. 2 are the structures of A blade, and the height dimension La of blade root molded lines part 2.1, Fig. 3, Fig. 4 are the structures of B blade, the height dimension Lb of blade root molded lines part 2.1, La＞Lb.Correspondingly, the race on the impeller 10 also is two kinds, and referring to Fig. 6, Fig. 7, the physical dimension of two kinds of races is the blade root size of adaptive two kinds of blades respectively.Two kinds of races are alternate layouts, two kinds of blades are corresponding respectively to be loaded in the adaptive separately race, that is to say, blade A, B also are alternate layouts.Obviously, the total quantity of blade must be an even number.
Referring to Fig. 9, another characteristics of the present invention are: integral shroud 3 is provided with damping structure 4, and damping structure 4 is positioned on the adjacent two blade shroud fitting surfaces, and after all blade installation finished, integral shroud 3 combination lopping constituted whole circle damping shroud.
Referring to Fig. 8, characteristics more of the present invention are: leave gap X between the adjacent blades blade root intermediate part 2.2.
Become the whole level moving vane of untuned by what above-mentioned three characteristics formed jointly once enclosing moving vane.
Principle of the present invention:
Adopt after this structure, the air-flow path of whole grade blade all is the same, does not influence the through-flow effect of steam turbine.But owing between the adjacent blades blade root intermediate 2.2 certain clearance X is arranged, the vibration initial position of blade A and blade B is all near the surface of contact (P, Q) that blade root connects with race, referring to Fig. 7, again because the height dimension of the blade root molded lines part 2.1 of blade A and blade B is that L is different, so these two kinds of moving vane natural frequencys are always different.
In the whole level system of this kind structure, even if the moving vane of half (blade A or blade B) natural frequency and excitation force frequency resonate, but second half blade (blade A or blade B) does not always resonate.And arrange from blade, every its adjacent moving vane of blade that is in resonance state is not to be in resonance state, again because between the adjacent blades damping linkage structure is arranged, so excitation force absorbs the part of the resonance blade intake blade that will do not resonated, some energy is owing to damping dissipates.Can not increase to some extent though be not in the blade amplitude of resonance state, with regard to whole level system, the blade dynamic stress is reduced greatly.So, can be by adjusting the natural frequency relative difference of two kinds of blades, just control blade root size L length difference and control the response of whole system and dynamic stress within safety range.
Claims (4)
1. the whole level steam turbine of a untuned is lacked moving vane, is assemblied in by many short moving vanes to constitute whole level on the impeller, and described short blade has integrally-built blade, blade root, integral shroud, and blade root has molded lines part and intermediate part; It is characterized in that: this grade blade is divided into two kinds, and the blade root molded lines part of two kinds of blades is highly different, two kinds of alternate being arranged on the impeller of blade.
2. the short moving vane of the whole level steam turbine of untuned according to claim 1 is characterized in that: leave the gap between the blade root intermediate of described two kinds of blades.
3. the whole level steam turbine of untuned according to claim 1 is lacked moving vane, and it is characterized in that: described integral shroud has damping structure.
4. the whole level steam turbine of untuned according to claim 1 is lacked moving vane, and it is characterized in that: described blade root is axial loading type blade root.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100460669A CN101349169A (en) | 2008-09-12 | 2008-09-12 | Full level steam turbine short movable vane without frequency modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100460669A CN101349169A (en) | 2008-09-12 | 2008-09-12 | Full level steam turbine short movable vane without frequency modulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101349169A true CN101349169A (en) | 2009-01-21 |
Family
ID=40268110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100460669A Pending CN101349169A (en) | 2008-09-12 | 2008-09-12 | Full level steam turbine short movable vane without frequency modulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101349169A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469513A (en) * | 2018-12-13 | 2019-03-15 | 西安交通大学 | A kind of steam turbine and its fir-tree root wheel rim slot structure for the arrangement that misplaces |
-
2008
- 2008-09-12 CN CNA2008100460669A patent/CN101349169A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469513A (en) * | 2018-12-13 | 2019-03-15 | 西安交通大学 | A kind of steam turbine and its fir-tree root wheel rim slot structure for the arrangement that misplaces |
| CN109469513B (en) * | 2018-12-13 | 2020-10-27 | 西安交通大学 | Steam turbine and fir-type blade root rim groove structure arranged in staggered mode of steam turbine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3968234B2 (en) | Row of flow guide elements for turbomachines | |
| EP2108785B1 (en) | Turbine blade and vane assembly with a ceramic platform | |
| EP2372096B1 (en) | Composite fan blade dovetail root | |
| JP6122945B2 (en) | Wind turbine rotor blades | |
| CN101922312B (en) | Method for controlling radial clearance leakage loss of turbomachine | |
| US8602732B2 (en) | Wind turbine rotor blade with passively modified trailing edge component | |
| JP5479388B2 (en) | Wind turbine blade and wind power generator equipped with the same | |
| JP6067130B2 (en) | Wind power generator | |
| US7503747B2 (en) | Rotatable duct type shrouded rotating wing | |
| US20120027588A1 (en) | Root flap for rotor blade in wind turbine | |
| EP2784301B1 (en) | Rotor blade assembly for wind turbine having load reduction features | |
| CN101660486B (en) | With the wind turbine blade of cross webs | |
| US8333555B2 (en) | Multifrequency control stage for improved dampening of excitation factors | |
| EP2342453B1 (en) | Wind turbine with low induction tips | |
| EP2208859A3 (en) | Steam turbine and cooling method thereof | |
| US20100150727A1 (en) | Rotor blade for a gas turbine | |
| RU2518767C2 (en) | Turbine blade and turbine wheel with said blades | |
| US20160377049A1 (en) | Structural support members with different areal weight fiber reinforcing layers for wind turbine rotor blades | |
| CN110998088B (en) | Rotor blade for a rotor of a wind energy installation, wind energy installation and method for improving the efficiency of a rotor of a wind energy installation | |
| CN101349169A (en) | Full level steam turbine short movable vane without frequency modulation | |
| CN103061823B (en) | Lacing hole structure of turbine blade and loose lacing wire installation structure of the same turbine blade | |
| CN105960527B (en) | Pre-bent wind turbine blades and the method for manufacturing the pre-bent wind turbine blades | |
| EP3228819B1 (en) | Blade comprising cmc layers | |
| WO2014187949A1 (en) | Structural member for a wind turbine | |
| KR101566501B1 (en) | Downwind Windpower Generating Apparatus having Swept Blade Tip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090121 |