CN201507325U - Large-size turbine last stage blade - Google Patents
Large-size turbine last stage blade Download PDFInfo
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- CN201507325U CN201507325U CN2009202228943U CN200920222894U CN201507325U CN 201507325 U CN201507325 U CN 201507325U CN 2009202228943 U CN2009202228943 U CN 2009202228943U CN 200920222894 U CN200920222894 U CN 200920222894U CN 201507325 U CN201507325 U CN 201507325U
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Abstract
The utility model discloses a large-size turbine last stage blade, and relates to the technology of turbine blades. The large-size turbine last stage blade comprises a shroud ring, a blade-shaped line part, a boss tie bar and a blade root, which are integrally shaped, wherein the blade-shaped line part is a variable cross-section twisted blade, the boss tie bar and the shroud ring are respectively a boss damping tie bar and a damping shroud ring with crown, wherein the top end of the blade-shaped line part is embedded with a stellite alloy plate, the satellite alloy plate penetrates into the outer surface of the shroud ring part, and the end portion of the alloy plate is protected by the shroud rings through the lap joint of the shroud rings, and water can not directly flush to corrode the end portion of the blade-shaped line part of the alloy plate, thereby the safety of the blade is improved.
Description
Technical field
The utility model relates to turbine blade, particularly a kind of large-size steam turbine exhaust stage blade.
Background technique
Large capacity turbine, the power of its low pressure (LP) cylinder account for about 35% of complete machine capacity, and exhaust stage blade if can make the total annulus area of blade increase by 10%, just can make overall efficiency improve 1～2%.Therefore develop the important topic that final blades become domestic and international steam turbine industry.
As everyone knows, the water erosion wearing and tearing of blade can cause the Economy of last stage vane of steam turbine to reduce significantly, so corrosion protection becomes the important topic in the research of turbine low pressure cylinder exhaust stage blade.Soldering Si Taili alloy slice is one of anti-water erosion measure of generally adopting at present.The Si Taili alloy slice has higher anti-water erosion, but also has deficiency, occurs the phenomenon that alloy slice breaks away from the moving vane leading edge easily.
At present, there is the problem of inefficiency, job security difference in existing large-size steam turbine exhaust stage blade.
The model utility content
The purpose of this utility model provides a kind of large-size steam turbine exhaust stage blade, can supply the large-size steam turbine safe and reliable operation, and working efficiency is high, to solve the problem of existing large-size steam turbine exhaust stage blade inefficiency, job security difference.
For achieving the above object, technical solution of the present utility model is:
A kind of large-size steam turbine exhaust stage blade comprises blade-section, leaf root part, leaf top part; (1) the blade profile line of blade is that variable cross section reverses shape, is reduced gradually by the section area of root to the top along blade height, reverses between the adjacent two sections; (2) shroud of leaf top part is a self-crown damping shroud; The lacing wire of blade both sides is for carrying the boss damp-ing wire; (3) blade root is the circular arc fir tree blade root, with the fit of wheel rim be axially assembling; Wherein: the axially locating of blade root and wheel rim adopts the mode of axially locating ring; (4) the top molded lines of shroud and vane type line part adopts special transient mode; make stellite alloy film can stretch into the outer surface of neckband; by the overlap joint between shroud; the end of stellite alloy film is protected by shroud; water droplet is the direct end vane type line part of erosion stellite alloy film not, the Security that has improved blade.
Described large-size steam turbine exhaust stage blade, the height (H2) of its described vane type line part is 1068mm, and the root axial width (B1) of vane type line part is 258.56mm, and the apical axis of vane type line part is 34.53mm to width (B2).The vane type line part cross section geometric data from root to the top: cross section number (A-A) depth of section of number (W-W) is 0～1068mm to the cross section, axial width B is 258.56～34.53mm, how much inlet angles are 35.1677 °～-81.2961 °, how much flow outlet angles are 24.446 °～9.672 °, established angle is 68.55 °～12.253 °, and the blade profile sectional area is 66.1～9.09cm
2, maximum ga(u)ge (O) is 31.22～8.38mm, trailing edge thickness (δ) is 4.43～2.25mm.Blade root (4) axial width (B0) is 300mm, and the total height of blade root (H1) is 90mm.
Described large-size steam turbine exhaust stage blade, its described root of blade are K type passage leaf grating, and the middle part is a contraction passage leaf grating, and the top is a convergent-divergent passage leaf grating.
The gap W1 that described large-size steam turbine exhaust stage blade, its described leaf push up between two adjacent shroud working surface A, the B face is 0～1.0mm; Gap W2 between two adjacent boss tie pieces working surface C, the D face is 0～1.0mm.
Described large-size steam turbine exhaust stage blade, the position of its described blade lacing part is 650mm apart from the distance (H3) of root molded lines; Tangential distance (J) between the two lacing wire boss working surfaces of N-N cross section is 91.32mm.
Described large-size steam turbine exhaust stage blade, its described axially locating ring is connected to form in proper order by a plurality of arc positioning sections; A plurality of positioning sections are the T shape of side, are divided into common positioning section and seal positioning section, and common positioning section is a plurality of, and sealing positioning section is one;
A plurality of common positioning sections are divided into three kinds according to length: a kind of is a pitch, second kind is two pitches, and the third is four pitches; Common positioning section is made of the arc L shape first half and arc L shape Lower Half, and the upper and lower half is amplexiformed into the T shape segmental arc of side up and down, and abutted surface each other is the plane;
An arc seals positioning section, and its length is a pitch, is made of the arc L shape first half and arc L shape Lower Half, the relative up and down face in upper and lower half is the plane, and two interplanars have a gap, an arcuation bar shaped sprue, its length and gap are suitable, are positioned at the gap.Seal the positioning section first half, sprue, seal the T shape segmental arc that the positioning section Lower Half is amplexiformed into side up and down;
On blade root and impeller abutted surface, be provided with and the suitable groove of axially locating ring at the wheel rim place of blade root bottom, impeller;
Behind the location, the axially locating ring is positioned at the groove at blade root bottom, wheel rim place, and is fixing with welding between the upper and lower half of sealing positioning section and the sprue.
Described large-size steam turbine exhaust stage blade, its described axially locating ring comprises one of the common positioning section of a pitch, two of the common positioning sections of two pitches, 18 of the common positioning sections of four pitches seal one of positioning section, and end-to-end constitutes a whole axially locating ring;
Behind the location, the first half of a plurality of positioning sections is in the groove of blade root bottom, and Lower Half is in the groove at wheel rim place, and is fixing with welding between the upper and lower half of sealing positioning section and the sprue.
The utility model has the advantages that: one. the Security of this blade and high efficiency are organically combined, make this blade have higher variable working condition characteristic, thereby guarantee that unit under variable working condition, also can efficiently and safely move.Two. exhaust stage blade of the present utility model assembling is very convenient, when static, between the shroud of adjacent blades, have the gap between the boss tie pieces, during work, under action of centrifugal force, make moving vane form whole circle by twist recovery and connects.Three. vane tip of the present utility model adopts and carries shroud, and the problem of stress concentration that does not exist riveted joint to cause is reduced the loss, and improves unit efficiency.Four. the utility model adopts the method for soldering Si Taili alloy slice to prevent water erosion, has improved the Security of blade.Five. the utility model adopts the circular arc fir tree blade root, and the fit of blade is for axially packing into, and the axially locating of blade root and wheel rim adopts the mode of axially locating ring.Six. the utility model adopts the structure of boss tie pieces, has increased vibration damping, has eliminated the possibility that the vibration of B0 type takes place.Seven. the utility model adopts the structure of bone-type enclosing strip, has greatly reduced the centrifugal tensile stress of shroud, thereby has improved the Security of operation.
Description of drawings
Fig. 1 is the overall structure schematic representation of a kind of large-size steam turbine exhaust stage blade of the present utility model;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the plan view of Fig. 1, and wherein: 10 is the root center line; 11 is rotor centerline;
Fig. 4 is the plan view of vane type line part;
Fig. 5 is the superimposed figure of the cross section profile of this novel moving vane molded lines part, wherein:
Fig. 5 (a), Fig. 5 (b), Fig. 5 (C) are respectively the superimposed figure of root, middle part, top cross-section;
Fig. 6 is leaf top girth band gap figure;
Fig. 7 is boss tie pieces gap figure;
Fig. 8 is the superimposed figure of last stage vane of steam turbine molded lines of the present utility model, and A-A, K-K, W-W represent cross section number;
Fig. 9 is blade root and wheel rim axially locating mode schematic representation; Wherein:
Fig. 9 a is the connection diagram of blade root 4 and wheel rim;
Fig. 9 b is the structural representation of axially locating ring;
Fig. 9 c is the cross-sectional schematic of axially locating ring;
Fig. 9 d analyses and observe for the A-A of Fig. 9 c, and expression axially locating ring common positioning section place is cutd open
View;
Fig. 9 e analyses and observe for the B-B of Fig. 9 c, the sectional view of expression axially locating ring seal mouth position.
Embodiment
See Fig. 1～4 and Fig. 8.A kind of large-size steam turbine exhaust stage blade comprises three parts: blade-section, leaf root part, leaf top part.Wherein: the shroud 1 on blade 2, blade root 4, leaf top is structure as a whole.(1) the blade profile line of blade is that variable cross section reverses shape, is reduced gradually by the section area of root to the top along blade height, reverses between the adjacent two sections.(2) blade root is high-intensity circular arc fir tree blade root, and the fit of blade is axially assembling.(3) shroud of leaf top part is a self-crown damping shroud; The lacing wire of blade both sides is for carrying the boss damp-ing wire.
A kind of large-size steam turbine exhaust stage blade, it is made up of bone-type enclosing strip 1, blade 2 molded lines part, boss tie pieces 3 and blade root 4.Shroud 1, blade 2 molded lines part and blade root 4 die forging from top to bottom are integral, boss tie pieces 3 is partly made one with blade 2 molded lines, the molded lines part of blade 2 is reversed shape for variable cross section, and the molded lines part of blade 2 is reduced gradually by the section area of root to the top, reverses between the adjacent two sections.The molded lines part of blade 2 highly is 1068mm, and the root axial width (B1) of blade 2 molded lines part is 258.56mm, and the top axial width (B2) of blade 2 molded lines part is 34.53mm.The blade 2 molded lines parts cross section geometric data from root to the top: cross section number (A-A) depth of section of number (W-W) is 0～1068mm to the cross section, axial width B is 258.56～34.53mm, how much inlet angles are 35.1677 °～-81.2961 °, how much flow outlet angles are 24.446 °～9.672 °, established angle is 68.55 °～12.253 °, and the blade profile sectional area is 66.1～9.09cm
2, maximum ga(u)ge (O) is 31.22～8.38mm, trailing edge thickness (δ) is 4.43～2.25mm.
See that Fig. 9 is blade root and wheel rim axially locating mode schematic representation, wherein, Fig. 9 a is the connection diagram of blade root 4 and wheel rim, Fig. 9 b is the structural representation of axially locating ring, Fig. 9 c is the cross-sectional schematic of axially locating ring, and wherein, A-A represents the sectional view at the common positioning section of axially locating ring place; B-B analyses and observe the sectional view of expression axially locating ring seal mouth position.As shown in the figure, the axially locating of blade root 4 and wheel rim adopts the mode of axially locating ring, and the axially locating ring is the T shape of side, is connected to form a whole axially locating ring in proper order by a plurality of arc positioning sections.A plurality of positioning sections all are the T shapes of side, are divided into common positioning section 7 and seal 8 two kinds of positioning sections, and the common positioning section 7 of arc has a plurality of, and arc seals positioning section 8 and has only one.
The common positioning section 7 of a plurality of arcs is divided into three kinds according to length: a kind of is a pitch, second kind is two pitches, and the third is four pitches.Common positioning section 7 is made of arc L shape first half 7a and arc L shape Lower Half 7b, and upper and lower half 7a, 7b amplexiform into the T shape segmental arc of side up and down, and abutted surface each other is the plane.
An arc seals positioning section 8, its length is a pitch, constitute by arc L shape first half 8a and arc L shape Lower Half 8b, the face that upper and lower half 8a, 8b are relative up and down is the plane, two interplanars have a gap, one arcuation bar shaped sprue 9, its length and gap are suitable, are positioned at the gap.First half 8a, sprue 9, Lower Half 8b amplexiform into the T shape segmental arc of side up and down.
On blade root 4 and impeller 6 abutted surfaces, the wheel rim place of blade root 4 bottoms, impeller 6 is provided with and the suitable groove of axially locating ring.
In the present embodiment, the quantity of exhaust stage blade is 78.Its axially locating ring comprises 7 one of the common positioning sections of a pitch, 7 two of the common positioning sections of two pitches, and 70 eight of the common positioning sections of four pitches seal 8 one of positioning sections.Seal positioning section 8 orders by these common positioning sections 7 and one and be connected to form a whole axially locating ring.According to above-mentioned, the quantity of exhaust stage blade is: 1+2x2+4x18+1=78 only.
Concrete fit is, common positioning section 7 and the first half 7a, the 8a that seal positioning section 8 pack in blade root 4 bottom grooves, and in the wheel rim place of impeller 6 groove, pack into common positioning section 7 and the Lower Half 7b, the 8b that seal positioning section 8, after whole circle axially locating ring installs, sprue 9 is inserted the gap of sealing between positioning section 8 upper and lower half 8a, the 8b, and weld with fixing.
Seeing Fig. 5, wherein, is that blade 2 roots are K type passage leaf grating shown in Fig. 5 a, is that the middle part is a contraction passage leaf grating shown in Fig. 5 b, is that the top is a convergent-divergent passage leaf grating shown in Fig. 5 c.The diameter of the blade path of each position of circle expression among the figure.
See shown in Fig. 6,7 that adjacent shroud 1 working surface A, the gap W1 between the B face on adjacent two leaves top are 0～1.0mm, the gap W2 between adjacent two blades, 2 middle part adjacent lands lacing wires, 3 working surface C, the D face is 0～1.0mm.
See shown in Fig. 1,7 that the position of boss tie pieces 3 parts is 650mm apart from the distance (H3) of root molded lines.Tangential distance (J) between boss tie pieces 3 working surfaces of N-N cross section is 91.32mm.
One. the utility model is by strengthening blade profile, rationally control root of blade degree of reaction and degree of reaction are along the high ways such as distribution of leaf, the Security and the high efficiency of this blade are organically combined, make this blade have higher variable working condition characteristic, thereby guarantee that unit under variable working condition, also can efficiently and safely move.Two. it is the structural type of one with blade root 4 that exhaust stage blade of the present utility model adopts shroud 1, vane type line part 2, boss tie pieces 3, assembles very convenient.When static, leave the gap between the link (shroud 1, boss 3), during work, under action of centrifugal force, make moving vane form whole circle by twist recovery and connect.Three. vane tip of the present utility model adopts and carries shroud, and the problem of stress concentration that does not exist riveted joint to cause is reduced the loss, and the multi-disc gland sealing gear can be assembled in the top, prevents gas leakage, improves unit efficiency.Four. the utility model adopts the method for soldering Si Taili alloy slice to prevent water erosion, has improved the Security of blade.Five. the utility model adopts the circular arc fir tree blade root, and the fit of blade is for axially packing into, and the axially locating of blade root and wheel rim adopts the mode of axially locating ring.Six. the utility model adopts the structure of boss tie pieces, has increased vibration damping, has eliminated the possibility that the vibration of B0 type takes place.Seven. the utility model adopts the structure of bone-type enclosing strip, has greatly reduced the centrifugal tensile stress of shroud, thereby has improved the Security of operation.
The concrete parameter in each cross section sees Table 1:
Table 1
| Cross section number | Depth of section L (mm) | Axial width B (mm) | The geometry inlet angles (°) | The geometry flow outlet angle (°) | Established angle (°) | Section area (cm 2) | Maximum ga(u)ge O (mm) | Trailing edge thickness δ (mm) |
| A-A | 0.0 | 258.56 | 35.1677 | 24.446 | 68.550 | 66.1 | 31.22 | 4.43 |
| C-C | 100 | 235.58 | 34.1961 | 24.352 | 64.285 | 55.52 | 28.12 | 4.24 |
| E-E | 200 | 205.83 | 33.2287 | 23.484 | 59.060 | 43.64 | 24.42 | 4.02 |
| G-G | 300 | 180.55 | 29.3514 | 22.580 | 54.498 | 34.95 | 22.01 | 3.9 |
| I-I | 400 | 155.4 | 22.2227 | 21.503 | 49.772 | 27.58 | 19.8 | 3.63 |
| K-K | 500 | 131.99 | 11.6348 | 20.369 | 44.995 | 21.57 | 18.03 | 3.38 |
| M-M | 600 | 110.48 | -3.6580 | 19.291 | 39.845 | 17.04 | 16.12 | 3.19 |
| O-O | 700 | 89.98 | -28.1477 | 19.045 | 33.822 | 12.75 | 13.31 | 2.57 |
| Q-Q | 800 | 71.99 | -47.6456 | 18.382 | 27.291 | 10.12 | 11.12 | 2.25 |
| S-S | 900 | 54.47 | -61.3021 | 16.400 | 20.489 | 8.81 | 9.08 | 2.11 |
| U-U | 1000 | 41.85 | -70.3940 | 12.866 | 14.497 | 8.34 | 7.76 | 2.17 |
| V-V | 1050 | 36.67 | -78.4109 | 10.617 | 12.676 | 8.8 | 8.01 | 2.22 |
| W-W | 1068 | 34.53 | -81.2961 | 9.672 | 12.253 | 9.09 | 8.38 | 2.25 |
Claims (7)
1. a large-size steam turbine exhaust stage blade comprises blade-section, leaf root part, leaf top part; It is characterized in that:
The blade profile line of blade is that variable cross section reverses shape, is reduced gradually by the section area of root to the top along blade height, reverses between the adjacent two sections;
The shroud of leaf top part is a self-crown damping shroud; The lacing wire of blade both sides is for carrying the boss damp-ing wire;
Blade root is the circular arc fir tree blade root, with the fit of wheel rim be axially assembling;
The axially locating of blade root and wheel rim adopts the mode of axially locating ring;
The top molded lines of shroud and vane type line part adopts transient mode; make stellite alloy film can stretch into the outer surface of neckband; by the overlap joint between shroud, the end of stellite alloy film is protected by shroud, and water droplet is the direct end vane type line part of erosion stellite alloy film not.
2. large-size steam turbine exhaust stage blade according to claim 1, it is characterized in that: the height (H2) of described vane type line part is 1068mm, the root axial width (B1) of vane type line part is 258.56mm, and the apical axis of vane type line part is 34.53mm to width (B2).The vane type line part cross section geometric data from root to the top: cross section number (A-A) depth of section of number (W-W) is 0～1068mm to the cross section, axial width B is 258.56～34.53mm, how much inlet angles are 35.1677 °～-81.2961 °, how much flow outlet angles are 24.446 °～9.672 °, established angle is 68.55 °～12.253 °, and the blade profile sectional area is 66.1～9.09cm
2, maximum ga(u)ge (O) is 31.22～8.38mm, trailing edge thickness (6) is 4.43～2.25mm.Blade root (4) axial width (B0) is 300mm, and the total height of blade root (H1) is 90mm.
3. large-size steam turbine exhaust stage blade according to claim 1 is characterized in that: described root of blade is a K type passage leaf grating, and the middle part is a contraction passage leaf grating, and the top is a convergent-divergent passage leaf grating.
4. large-size steam turbine exhaust stage blade according to claim 1 is characterized in that: the gap W1 that described leaf pushes up between two adjacent shroud working surface A, the B face is 0～1.0mm; Gap W2 between two adjacent boss tie pieces working surface C, the D face is 0～1.0mm.
5. large-size steam turbine exhaust stage blade according to claim 1 is characterized in that: the position of described blade lacing part is 650mm apart from the distance (H3) of root molded lines; Tangential distance (J) between the two lacing wire boss working surfaces of N-N cross section is 91.32mm.
6. large-size steam turbine exhaust stage blade according to claim 1 is characterized in that: described axially locating ring is connected to form in proper order by a plurality of arc positioning sections; A plurality of positioning sections are the T shape of side, are divided into common positioning section and seal positioning section, and common positioning section is a plurality of, and sealing positioning section is one;
A plurality of common positioning sections are divided into three kinds according to length: a kind of is a pitch, second kind is two pitches, and the third is four pitches; Common positioning section is made of the arc L shape first half and arc L shape Lower Half, and the upper and lower half is amplexiformed into the T shape segmental arc of side up and down, and abutted surface each other is the plane;
An arc seals positioning section, and its length is a pitch, is made of the arc L shape first half and arc L shape Lower Half, the relative up and down face in upper and lower half is the plane, and two interplanars have a gap, an arcuation bar shaped sprue, its length and gap are suitable, are positioned at the gap.Seal the positioning section first half, sprue, seal the T shape segmental arc that the positioning section Lower Half is amplexiformed into side up and down;
On blade root and impeller abutted surface, be provided with and the suitable groove of axially locating ring at the wheel rim place of blade root bottom, impeller;
Behind the location, the axially locating ring is positioned at the groove at blade root bottom, wheel rim place, and is fixing with welding between the upper and lower half of sealing positioning section and the sprue.
7. large-size steam turbine exhaust stage blade according to claim 1, it is characterized in that: described axially locating ring, one of the common positioning section that comprises a pitch, two of the common positioning sections of two pitches, 18 of the common positioning sections of four pitches, seal one of positioning section, end-to-end constitutes a whole axially locating ring;
Behind the location, the first half of a plurality of positioning sections is in the groove of blade root bottom, and Lower Half is in the groove at wheel rim place, and is fixing with welding between the upper and lower half of sealing positioning section and the sprue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202228943U CN201507325U (en) | 2009-09-23 | 2009-09-23 | Large-size turbine last stage blade |
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| CN2009202228943U CN201507325U (en) | 2009-09-23 | 2009-09-23 | Large-size turbine last stage blade |
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| CN201507325U true CN201507325U (en) | 2010-06-16 |
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| CN2009202228943U Expired - Lifetime CN201507325U (en) | 2009-09-23 | 2009-09-23 | Large-size turbine last stage blade |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852560A (en) * | 2011-06-29 | 2013-01-02 | 株式会社日立制作所 | Supersonic turbine moving blade and axial-flow turbine |
| CN108907491A (en) * | 2018-06-20 | 2018-11-30 | 安徽电力股份有限公司淮南田家庵发电厂 | A kind of Steam Turbine blade welding structure and its processing method |
-
2009
- 2009-09-23 CN CN2009202228943U patent/CN201507325U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852560A (en) * | 2011-06-29 | 2013-01-02 | 株式会社日立制作所 | Supersonic turbine moving blade and axial-flow turbine |
| US9051839B2 (en) | 2011-06-29 | 2015-06-09 | Mitsubishi Hitachi Power Systems, Ltd. | Supersonic turbine moving blade and axial-flow turbine |
| CN102852560B (en) * | 2011-06-29 | 2015-12-09 | 三菱日立电力***株式会社 | Supersonic turbine moving vane and axial flow turbine |
| CN104533533B (en) * | 2011-06-29 | 2016-08-31 | 三菱日立电力***株式会社 | Supersonic turbine moving vane and axial flow turbine |
| CN108907491A (en) * | 2018-06-20 | 2018-11-30 | 安徽电力股份有限公司淮南田家庵发电厂 | A kind of Steam Turbine blade welding structure and its processing method |
| CN108907491B (en) * | 2018-06-20 | 2021-04-06 | 安徽电力股份有限公司淮南田家庵发电厂 | Turbine unit blade welding structure and machining method thereof |
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