CN205047249U - Last -stage blade for steam turbine - Google Patents
Last -stage blade for steam turbine Download PDFInfo
- Publication number
- CN205047249U CN205047249U CN201520670138.2U CN201520670138U CN205047249U CN 205047249 U CN205047249 U CN 205047249U CN 201520670138 U CN201520670138 U CN 201520670138U CN 205047249 U CN205047249 U CN 205047249U
- Authority
- CN
- China
- Prior art keywords
- blade
- lacing wire
- wire boss
- boss
- steam turbine
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a last -stage blade for steam turbine, include the blade, establish the blade root bottom the blade and establish the integral shroud at the blade top that the blade includes the admission side and goes out the vapour side, on blade upper portion the silver soldering stellite of admission side position department piece, upper portion is equipped with two lacing wire bosss in proper order in the blade, first lacing wire boss and second lacing wire boss are cylindrically, first lacing wire boss and the cross section of second lacing wire boss is the same, adopt two lacing wire bosss, with root fixing in groups the time, through the connection of mutually supporting of two lacing wire bosss, the rigidity that has further improved the blade with reduced the dynamic stress that the blade bore, the contact and the rubbing action of two other bosss, the structural damping that can improve the blade greatly, can resist effectively tired with tremble destructions, messenger's blade fail safe nature further improve, reinforce the protection to the blade surface and handle, improve the water -resistant erosion nature of blade.
Description
Technical field
The utility model relates to a kind of structural element of steam turbine, specifically relates to a kind of steam turbine final blade.
Background technique
The reliability of large-size steam turbine exhaust stage blade is a very complicated problem, it relates to the standard etc. of aerodynamic design, Machine Design and material selection, steam does work along with the reduction of pressure and temperature in steam turbine, the expansion of volume, because the vapor pressure of afterbody is minimum, required volume flow is also the highest, and therefore exhaust stage blade is one-level the longest in each grade blade of steam turbine, subject maximum centrifugal force load and consequent stress
According to statistics, domestic and international exhaust stage blade fracture accident frequently occurs, generally, exhaust stage blade occurs that the reason of crackle and fracture accident roughly can be summarized as: large-size steam turbine exhaust stage blade works under wet vapor condition, in addition the linear velocity on last stage movable vane leaf top is supervelocity, even more serious to the water erosion of exhaust stage blade like this, therefore design the high exhaust stage blade of a kind of reliability and seem very necessary.
Model utility content
Goal of the invention: in order to overcome the deficiencies in the prior art, the utility model provides the steam turbine final blade that a kind of safety reliability is high.
Technological scheme: for solving the problems of the technologies described above, steam turbine final blade of the present utility model, comprise blade, be located at the blade root bottom described blade and be located at the integral shroud at described blade top, described blade comprises admission side and steam output side limit, described in described blade top, admission side position connects stellite alloy film by silver soldering, lacing wire boss is provided with successively in described blade middle and upper part, described lacing wire boss comprises the first lacing wire boss and the second lacing wire boss, described second lacing wire boss is positioned at below described first lacing wire boss, described first lacing wire boss and the second lacing wire boss are cylindrical, described first lacing wire boss is identical with the cross section of described second lacing wire boss.
Further, described first lacing wire boss is identical with the height of described second lacing wire boss, and the altitude range of described first lacing wire boss and described second lacing wire boss is 10 ~ 30mm.
Further, the distance range between described second lacing wire boss and described first lacing wire boss is 30 ~ 50mm.Further, described blade root adopts five forked types or seven multifork roots.
Further, described blade is the blade adopting alloy material of admiring to manufacture.
Further, described integral shroud comprises the shroud integrally welded with described integral shroud.
Further, the fit up gap size of docking between the described lacing wire boss coordinated is 0.1 ~ 1mm.
Further, the height of described blade is not less than 850mm.
Beneficial effect: compared with the prior art, the advantage had is the utility model:
1, two lacing wire boss are adopted, when blade is connected in groups, by the connection that cooperatively interacts of two lacing wire boss, further increase the rigidity of blade and reduce the dynamic stress that blade bears, additionally by contact and the rubbing action of two lacing wire boss, greatly can improve the structural damping of blade, can resisting fatigue and to tremble destruction effectively, blade safety reliability is improved further;
2, enhanced protection process is carried out to blade surface, improve the water resistant erosion of blade.
Accompanying drawing explanation
Fig. 1 is steam turbine final blade structural representation of the present utility model.
Fig. 2 is the side view of Fig. 1.
Two lacing wire boss docking cooperation figure when Fig. 3 is blade assembling.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As Fig. 1, shown in 2, the utility model provides a kind of steam turbine final blade, comprise blade 1, be located at the blade root 2 bottom described blade 1 and be located at the integral shroud 3 at described blade 1 top, described blade 1 comprises admission side 4 and steam output side limit 5, serious water erosion damaging problem is had at blade top admission side, so described in described blade 1 top admission side 4 position silver soldering stellite alloy film 6, when blade operationally, stellite alloy film 6 serves the effect of water resistant erosion, two lacing wire boss 7 are provided with successively in described blade 1 middle and upper part, be respectively the first lacing wire boss and the second lacing wire boss, described second lacing wire boss is positioned at below described first lacing wire boss, described first lacing wire boss and the second lacing wire boss are cylindrical, described first lacing wire boss is identical with the cross section of described second lacing wire boss, described first lacing wire boss is identical with the height of described second lacing wire boss, the altitude range of described first lacing wire boss and described second lacing wire boss is 10 ~ 30mm, distance range between described second lacing wire boss and described first lacing wire boss is 30 ~ 50mm, the state do not disturbed mutually is ensured like this when blade working, blade in groups time, fit up gap size between the described lacing wire boss 7 that adjacent blade docking coordinates is 0.1 ~ 1mm, as shown in Figure 3, the docking between one of them lacing wire boss and lacing wire boss of adjacent blades of one of them blade coordinates, when the docking of adjacent blade coordinates, contacted with each other by end section by the first lacing wire boss of one of them blade and the first lacing wire boss of another blade, second lacing wire boss of one of them blade and the second lacing wire boss of another blade are contacted with each other by end section, gap length between the lacing wire boss contacted with each other is 0.1 ~ 1mm.
Described blade 1 is the blade adopting the alloy material TIA16V4 that admires to manufacture, this material proportion is little and intensity is high, proportion is only firm 1/4th, the height of described blade 1 is not less than 850mm, the blade that the alloy material TIA16V4 that admires manufactures, the height of such as blade 1 is 851mm blade, and its yield strength is not less than 655MPa; The height of blade 1 is at the blade of about 1000mm, and its yield strength is not less than 735MPa.
Described integral shroud 3 comprises the shroud integrally welded with described integral shroud 3.
Described blade root 2 adopts five forked types or seven multifork roots, and as shown in Figure 1, described blade root 2 adopts five multifork roots, finally blade in groups time, to be locked with wheel rim by locating stud and be connected.
The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. a steam turbine final blade, comprise blade (1), be located at the blade root (2) of described blade (1) bottom and be located at the integral shroud (3) at described blade (1) top, it is characterized in that: described blade (1) comprises admission side (4) and steam output side limit (5), described in described blade (1) top, admission side (4) position connects stellite alloy film (6) by silver soldering, lacing wire boss (7) is provided with successively in described blade (1) middle and upper part, described lacing wire boss (7) comprises the first lacing wire boss and the second lacing wire boss, described second lacing wire boss is positioned at below described first lacing wire boss, described first lacing wire boss and the second lacing wire boss are cylindrical, described first lacing wire boss is identical with the cross section of described second lacing wire boss.
2. steam turbine final blade according to claim 1, is characterized in that: described first lacing wire boss is identical with the height of described second lacing wire boss, and the altitude range of described first lacing wire boss and described second lacing wire boss is 10 ~ 30mm.
3. steam turbine final blade according to claim 1, is characterized in that: the distance range between described second lacing wire boss and described first lacing wire boss is 30 ~ 50mm.
4. steam turbine final blade according to claim 1, is characterized in that: described blade root (2) is employing five forked type or seven multifork roots.
5. steam turbine final blade according to claim 1, is characterized in that: described blade (1) is the blade adopting alloy material of admiring to manufacture.
6. steam turbine final blade according to claim 1, is characterized in that: described integral shroud (3) comprises the shroud integrally welded with described integral shroud (3).
7. steam turbine final blade according to claim 1, is characterized in that: the fit up gap size between the described lacing wire boss (7) that docking coordinates is 0.1 ~ 1mm.
8. steam turbine final blade according to claim 1, is characterized in that: the height of described blade (1) is not less than 850mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520670138.2U CN205047249U (en) | 2015-08-31 | 2015-08-31 | Last -stage blade for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520670138.2U CN205047249U (en) | 2015-08-31 | 2015-08-31 | Last -stage blade for steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205047249U true CN205047249U (en) | 2016-02-24 |
Family
ID=55340840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520670138.2U Expired - Fee Related CN205047249U (en) | 2015-08-31 | 2015-08-31 | Last -stage blade for steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205047249U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566282A (en) * | 2019-10-24 | 2019-12-13 | 哈尔滨汽轮机厂有限责任公司 | 835mm last-stage moving blade suitable for low-load working condition operation |
-
2015
- 2015-08-31 CN CN201520670138.2U patent/CN205047249U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566282A (en) * | 2019-10-24 | 2019-12-13 | 哈尔滨汽轮机厂有限责任公司 | 835mm last-stage moving blade suitable for low-load working condition operation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160224 Termination date: 20190831 |