CN214944441U - 610mm final-stage moving blade and blade group for variable-speed operation - Google Patents
610mm final-stage moving blade and blade group for variable-speed operation Download PDFInfo
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- CN214944441U CN214944441U CN202120431136.3U CN202120431136U CN214944441U CN 214944441 U CN214944441 U CN 214944441U CN 202120431136 U CN202120431136 U CN 202120431136U CN 214944441 U CN214944441 U CN 214944441U
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Abstract
The utility model belongs to the industrial steam turbine field discloses a 610mm last stage moving blade and blading for variable speed operation. The blade comprises a blade body and a blade root, wherein the blade root is arranged at the bottom of the blade body, the blade further comprises a lacing wire and a shroud ring, the lacing wire is arranged in the middle of the blade body, the shroud ring is arranged at the top of the blade body, the cross-sectional area of the blade body in the blade height direction is gradually reduced from the bottom to the top, and the cross-sectional shape of the blade body is a closed curve.
Description
Technical Field
The utility model belongs to the industrial steam turbine field, concretely relates to a 610mm last stage moving blade and blading for variable speed operation.
Background
The 8 ten thousand air separation units are applied more and more in China, and the design and the manufacture of a steam turbine matched with the air separation units are inevitable. One of the key points of the design of the steam turbine is the design of the last stage moving blade. How to let steam turbine last stage moving blade both satisfy the high performance requirement when variable operating mode moves, satisfy the intensity requirement under the abominable operating mode again, become the crucial and urgent problem of awaiting solution in the last stage moving blade design. At present, most industrial steam turbine units have the problems of small steam exhaust area, low pneumatic efficiency, incapability of meeting the operation requirements of large load variable working conditions and the like.
One of the design difficulties for the blades of a driving turbine is that the turbine is required to be operated safely within 75-105% of the rated speed. The working rotating speed range of the blades with the blade height of 610mm is wide, a resonance area cannot be avoided in an operation rotating speed range, and the dynamic stress of the blades during resonance is required to meet the strength margin of safe operation, so the design difficulty is high.
Disclosure of Invention
An object of the utility model is to provide a 610mm last stage moving blade for becoming rotational speed operation for the steam extraction area of industrial steam turbine group is less among the solution prior art, and pneumatic efficiency is low, can not adapt to the problem of the operation requirement of heavy load variable operating mode.
In order to realize the task, the utility model discloses a following technical scheme:
a610 mm last-stage moving blade for variable-speed operation comprises a blade body and a blade root, wherein the blade root is arranged at the bottom of the blade body, the blade root further comprises a lacing wire and a shroud band, the lacing wire is arranged in the middle of the blade body, the shroud band is arranged at the top of the blade body, the sectional area of the blade body in the blade height direction is gradually reduced from the bottom to the top, and the sectional shape of the blade body is a closed curve.
Further, the parameters of each characteristic section of the blade body from the blade bottom to the blade top are as follows:
the width of the molded line is monotonically reduced from 199.66mm to 49.133mm, the pitch is monotonically increased from 53.885mm to 108.65mm, the thickness of the blade is monotonically increased from 65.266mm to 124.01mm, the average diameter of the blade body is 1810mm, the height of the blade body is 610mm, and the steam exhaust area of the blade body is 3.5 square meters.
Further, the parameters of the blade root are as follows: the axial width of the blade root is 220mm, and the installation angle of the blade root is 80.5 degrees.
The utility model provides a 610mm last stage moving blade group for variable speed operation, includes a plurality of 610mm last stage moving blades that are applicable to variable speed operating mode operation, and the clearance of shroud is 0.03 ~ 0.4mm on two adjacent moving blades, and the clearance between the lacing wire on two adjacent moving blades is 0.4 ~ 0.8 mm.
Further, the gap between the shrouds on two adjacent movable blades is 0.2mm, and the gap between the tie bars on two adjacent movable blades is 0.6 mm.
Compared with the prior art, the utility model has the following technical characteristics:
(1) the utility model provides an industrial steam turbine low-pressure stage group last stage blade's steam extraction area is the 3.5 square meters, can be used to the industrial steam turbine unit of 6 ten thousand kilowatts grades for level four low-pressure stage group last stage can move at great backpressure within range, has efficient variable operating mode operating characteristic, and the efficiency of the unit of improvement has great meaning to the economic nature and the fail safe nature that improve industrial steam turbine.
(2) The utility model discloses have good variable operating mode performance, at 2800 ~ 3900rpm rotational speed within range homoenergetic steady safe operation. The airflow bending stress under each working condition is smaller. Can meet the operation requirement of high rotating speed and high load, and has wide market application prospect.
(3) The local high-frequency quenching is carried out on the back arc side of the steam inlet side of the blade body, so that the hardness of the blade body on the back arc of the steam inlet side can be enhanced, and the phenomena of cracks, gaps and the like caused by water erosion of the back arc of the steam inlet side can be effectively avoided, thereby ensuring the safe and stable operation of the industrial steam turbine.
(4) The blade root is a four-tooth fir-tree blade root, so that the peak stress of the blade root and the blade rim can be reduced, and the safety and reliability of the final-stage blade of the variable-speed industrial steam turbine are improved.
(5) The shroud ring, the blade body, the boss and the blade root are integrally designed, so that residual stress generated by welding is avoided. The gap between the shroud and the boss is controlled, when the unit runs, the elastic torsion recovery trend of the blade always enables the shroud and the boss to be tightly attached to form a new whole circle for connection, so that the vibration characteristic of the blade is changed, and damping is generated between the working faces of the shroud and the boss under the action of micro-vibration to enable vibration to be attenuated.
Drawings
FIG. 1 is a schematic view of a blade configuration;
FIG. 2 is a front view of the blade structure;
FIG. 3 is a schematic illustration of a shroud attachment;
FIG. 4 is a schematic view of a tie bar connection;
FIG. 5 is a schematic cross-sectional area view;
FIG. 6 is a schematic cross-sectional view of the blade body at different heights;
fig. 7 is a schematic view of a blade assembly.
The reference numbers in the figures represent: 1-blade body, 2-blade root, 3-lacing wire and 4-shroud band.
Detailed Description
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means that the terms are defined with reference to the drawing plane of the corresponding drawing, and "inner" and "outer" mean that the terms are inner and outer relative to the outline of the corresponding part.
At first, the meaning of the technical words appearing in the utility model is given:
twisting the blades: the blade is a blade with the blade profile and the mounting angle (or the mounting angle only) changing along the blade height according to a certain rule. The utility model discloses a variable cross-section twisted blade, which is formed by superposing a plurality of characteristic cross sections according to a specific rule.
Fir tree blade root: the blade root is designed according to the load distribution of the blade root and the wheel rim, is in a sharp-wedge shape and is close to a blade root structure with equal strength, and the tooth number of the blade root can be determined according to the load.
And (3) stretching: the structure is added on the final stage of the moving blade and is used for connecting the blades together, on one hand, the strength is increased, and on the other hand, the frequency of the blades is adjusted to prevent resonance.
A shroud ring: a structure for reducing blade vibration response for use in power station steam turbines, gas turbines, aircraft engines, and other rotating machine blades. The shroud structure utilizes the friction action between adjacent blades to dissipate the vibration energy of the blades, thereby achieving the effect of vibration reduction.
The utility model discloses a 610mm last stage moving blade for changing rotational speed operation, including blade body 1 and blade root 2, blade root 2 sets up in blade body 1 bottom, still includes lacing wire 3 and shroud ring 4, lacing wire 3 sets up at blade body 1 middle part, shroud ring 4 sets up at blade body 1 top, the ascending cross sectional area of 1 leaf height of blade body reduces from bottom to top gradually, the cross sectional shape of blade body 1 is closed curve.
The closed curves are an inner arc curve, a steam inlet side arc curve, a back arc curve and a steam outlet side arc curve which are sequentially connected end to end; the inner arc curve is a concave part curve in the blade section, the steam inlet side arc curve is a transition arc curve of the steam inlet part of the blade section, the back arc curve is a convex part curve of the blade section, and the steam outlet side curve is a transition arc curve of the steam outlet part of the blade section.
Specifically, the blade root is a four-tooth fir-tree type, and the fir-tree type blade root has the advantages of strong load bearing capacity and convenience in assembly and is mainly used for the last stages of a high-power unit. The load distribution of each tooth of the fir tree blade root is related to the rigidity of the blade root, the wheel rim and the tooth.
The utility model also discloses a 610mm last stage moving vane group for variable speed operation, above-mentioned any kind of last stage moving vane, the clearance of shroud 4 on two adjacent moving vane is 0.03 ~ 0.4mm, and the clearance between lacing wire 3 on two adjacent moving vane is 0.4 ~ 0.8 mm.
Specifically, the gap between the upper shrouds 4 of the two adjacent moving blades is 0.2mm, and the gap between the upper tie bars 3 of the two adjacent moving blades is 0.6 mm.
Specifically, under the static state, the lacing wire boss clearance of two adjacent variable-speed industrial steam turbine last stage blades is 0.6mm, the shroud clearance is 0.2mm, under operating condition, under the centrifugal force effect, the blade can twist reverse, lead to the shroud of two adjacent variable-speed industrial steam turbine last stage blades through respective shroud coupling part contact coupling, the boss is through respective boss coupling part contact coupling, and then produce the contact force, reach the whole circle of blade auto-lock, improve the vibration characteristic of blade.
Specifically, the shroud ring, the tie bars, the blade body and the blade root of the blade root are integrally designed, so that residual stress generated by welding can be avoided.
Example 1
The present embodiment discloses a 610mm last stage moving blade for variable speed operation, and in addition to the above embodiments, the following technical features are also disclosed:
the section parameters of each characteristic section of the blade body from the blade bottom to the blade top have the following regularity that the profile width is monotonically reduced from 199.66mm to 49.133mm, the pitch is monotonically increased from 53.885mm to 108.65mm, and the blade thickness is monotonically increased from 65.266mm to 124.01 mm. The average diameter of the blade body of the blade is 1810mm, the height of the blade body is 610mm, and the steam exhaust area of the blade body is 3.5 square meters.
The axial width of the blade root is 220 mm. The setting angle of the blade root is 80.5 deg..
TABLE 1 geometric parameter table for different heights of leaf
Claims (4)
1. A610 mm last-stage moving blade for variable-speed operation comprises a blade body (1) and a blade root (2), wherein the blade root (2) is arranged at the bottom of the blade body (1), and is characterized by further comprising a tie bar (3) and a shroud band (4), the tie bar (3) is arranged in the middle of the blade body (1), the shroud band (4) is arranged at the top of the blade body (1), the cross-sectional area of the blade body (1) in the blade height direction is gradually reduced from the bottom to the top, and the cross-sectional shape of the blade body (1) is a closed curve;
the parameters of each characteristic section of the blade body (1) from the blade bottom to the blade top are as follows: the width of the molded line is monotonically reduced from 199.66mm to 49.133mm, the pitch is monotonically increased from 53.885mm to 108.65mm, the thickness of the blade is monotonically increased from 65.266mm to 124.01mm, the average diameter of the blade body is 1810mm, the height of the blade body is 610mm, and the steam exhaust area of the blade body is 3.5 square meters.
2. The final 610mm rotor blade for variable speed operation as claimed in claim 1, characterized in that the parameters of the blade root (2) are: the axial width of the blade root is 220mm, and the installation angle of the blade root is 80.5 degrees.
3. A610 mm last stage moving blade group for variable speed operation, characterized by comprising a plurality of 610mm last stage moving blades for variable speed operation according to any one of claims 1-2, wherein the clearance between the shrouds (4) on two adjacent moving blades is 0.03-0.4 mm, and the clearance between the tie bars (3) on two adjacent moving blades is 0.4-0.8 mm.
4. The 610mm last-stage moving blade group for variable-speed operation according to claim 3, wherein the clearance between the shrouds (4) on two adjacent moving blades is 0.2mm, and the clearance between the tie bars (3) on two adjacent moving blades is 0.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120431136.3U CN214944441U (en) | 2021-02-26 | 2021-02-26 | 610mm final-stage moving blade and blade group for variable-speed operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120431136.3U CN214944441U (en) | 2021-02-26 | 2021-02-26 | 610mm final-stage moving blade and blade group for variable-speed operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214944441U true CN214944441U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120431136.3U Active CN214944441U (en) | 2021-02-26 | 2021-02-26 | 610mm final-stage moving blade and blade group for variable-speed operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214944441U (en) |
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2021
- 2021-02-26 CN CN202120431136.3U patent/CN214944441U/en active Active
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