CN216841825U - High-efficient stator blade for steam turbine - Google Patents
High-efficient stator blade for steam turbine Download PDFInfo
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- CN216841825U CN216841825U CN202123382149.5U CN202123382149U CN216841825U CN 216841825 U CN216841825 U CN 216841825U CN 202123382149 U CN202123382149 U CN 202123382149U CN 216841825 U CN216841825 U CN 216841825U
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Abstract
The utility model relates to a high-efficient stator blade for steam turbine, including the blade profile, and respectively formed in shroud and blade root at blade profile both ends, the blade profile is formed by RON1 ~ RON2 curve section, RON2 ~ RON3 curve section, RON3 ~ RON4 curve section, RON4 ~ RON5 curve section, RON5 ~ RON6 curve section, RON6 ~ RON1 curve section rounding off in proper order, the last top of RON6 ~ RON1 curve section is provided with the play vapour limit of blade profile, the lower top of RON3 ~ RON4 curve section is provided with the admission limit of blade profile, the admission limit with it constructs respectively to enclose between the both sides on play vapour limit the suction surface of blade profile with the pressure surface of blade profile. The blade profile is formed by smooth transition of six sections of curve segments, so that the blade profile of the existing discrete points is improved, and the working efficiency is improved; and the processing technology of the blade can be simplified, and the processing cost of the blade is reduced.
Description
Technical Field
The utility model relates to a steam turbine technical field especially relates to a high-efficient stator blade is used to steam turbine.
Background
A steam turbine is a rotary power machine that converts thermal energy of steam into mechanical energy, and is one of the main devices of a steam power plant. The power generation system is mainly used as a prime motor for power generation, or directly drives various pumps, fans, compressors or ship propellers and the like, and can also meet the heat supply requirement in production or life by utilizing the exhaust steam or intermediate extraction steam of a steam turbine.
Because the steam turbine has such extensive usage, the cost index and efficiency index requirements for the steam turbine are higher and higher, and the blade is used as the core component of the steam turbine, not only the quantity is large, the shape is complex, and the processing requirement is high, so the processing technology of the blade determines the processing cost of the steam turbine to a great extent, the blade profile of the blade in the prior art is discrete points, the processing cost of the blade is increased, the blade is used as one of the key components determining the efficiency of the steam turbine, and the blade profile, the through-flow gap, the air leakage and the like of the blade determine the efficiency of the steam turbine.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a high-efficiency stationary blade for a steam turbine, the blade profile is formed by smooth transition of six sections of curve sections, the existing blade profile with discrete points is improved, and the working efficiency is improved; and the processing technology of the blade can be simplified, and the processing cost of the blade is reduced.
The utility model adopts the technical proposal that: a high-efficiency stator blade for a steam turbine comprises a blade profile, and a shroud band and a blade root which are respectively formed at two ends of the blade profile, wherein the blade profile is formed by sequentially and smoothly transitioning an RON 1-RON 2 curve section, an RON 2-RON 3 curve section, an RON 3-RON 4 curve section, an RON 4-RON 5 curve section, an RON 5-RON 6 curve section and an RON 6-RON 1 curve section, the upper top end of the RON 6-RON 1 curve section is provided with a steam outlet edge of the blade profile, the lower top end of the RON 3-RON 4 curve section is provided with a steam inlet edge of the blade profile, and a suction surface and a pressure surface of the blade profile are respectively enclosed between the steam inlet edge and two sides of the steam outlet edge.
As a further limitation to the above technical solution, the steam inlet edge is thickened, and the steam outlet edge is thinned, so that steam of the steam turbine is tapered from the steam inlet edge to the steam outlet edge, the thickness of the leading edge of the blade profile is 0.8mm to 1mm, and the thickness of the trailing edge of the blade profile is 0.15mm to 0.19 mm.
As a further limitation to the above technical solution, an inlet arc is provided on the inlet edge in the height direction of the blade profile.
As a further limitation to the above technical solution, the profile of the blade profile is a straight blade profile with a uniform cross section.
As a further limitation to the above technical solution, the shroud is provided with adjacent high and low blade tips to form a radial gap with a steam stop of a rotor of the steam turbine.
As a further limitation to the above solution, said through-flow radial clearance is 0.5 mm.
The utility model discloses a high-efficient stator blade for steam turbine, the blade profile through stator blade is by RON1 ~ RON2 curve section, RON2 ~ RON3 curve section, RON3 ~ RON4 curve section, RON4 ~ RON5 curve section, RON5 ~ RON6 curve section, RON6 ~ RON1 curve section six sections curve section smooth transition in proper order form, the blade profile of current discrete point has been improved, and work efficiency has been improved, and the processing technology that can make the blade obtains simplifying, and the processing cost of blade has been reduced; meanwhile, the upper top ends of the RON 6-RON 1 curve segments are provided with blade-shaped steam outlet edges, the lower top ends of the RON 3-RON 4 curve segments are provided with blade-shaped steam inlet edges, and blade-shaped suction surfaces and blade-shaped pressure surfaces are respectively enclosed between the two sides of the steam inlet edges and the steam outlet edges, so that steam can flow from the steam inlet edges to the steam outlet edges through the pressure surfaces, and the high efficiency of the steam turbine is realized.
Drawings
FIG. 1 is a schematic structural view of a high-efficiency stationary blade for a steam turbine according to the present invention;
FIG. 2 is a schematic view of the profile structure of the airfoil of the present invention;
fig. 3 is a partially enlarged view of a portion a of fig. 2.
In the figure:
1-blade profile, 11-steam outlet edge, 12-steam inlet edge, 13-suction surface, 14-pressure surface, 15-leading edge thickness, 16-trailing edge thickness, 17-steam inlet arc, 2-shroud ring, 21-high blade top, 22-low blade top, 3-blade root and H1-blade height.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1 and fig. 2, a high-efficiency stator blade for a steam turbine has an overall structure including a vane profile 1, and a shroud 2 and a blade root 3 respectively formed at both ends of the vane profile 1, specifically, the vane profile 1 is a working portion of the stator blade, and a steam flow channel is formed between the vane profiles 1 of adjacent vanes so as to convert thermal energy of steam into kinetic energy when steam flows through the steam; the blade root 3 is a connecting part for fixing the stationary blade on the steam turbine, and in the embodiment, a holding ring body is arranged in the steam turbine, so that the blade root 3 is inserted on the holding ring body, so that the stationary blade is arranged on the holding ring body; the shroud 2 is used for enhancing the rigidity of the stationary blades and changing the natural vibration frequency of the stationary blades to avoid resonance, so that the vibration safety of the stationary blades is improved, the bending stress generated by steam flow can be reduced, meanwhile, the stationary blades can form a closed channel, and the gas leakage loss at the tops of the stationary blades is further reduced by matching with the shroud 2 for steam sealing.
As shown in figure 2, the blade profile 1 is formed by sequentially and smoothly transitioning an RON 1-RON 2 curve segment, an RON 2-RON 3 curve segment, an RON 3-RON 4 curve segment, an RON 4-RON 5 curve segment, an RON 5-RON 6 curve segment and an RON 6-RON 1 curve segment, and the blade profile 1 is formed by sequentially and smoothly transitioning the six curve segments, so that the conventional blade profile 1 with discrete points is improved, the working efficiency is improved, the processing process of the blade is simplified, and the processing cost of the blade is reduced.
In this embodiment, as shown in fig. 2, the upper top end of the curve segments RON6 to RON1 is provided with a steam outlet side 11 of the blade profile 1, the lower top end of the curve segments RON3 to RON4 is provided with a steam inlet side 12 of the blade profile 1, and a suction surface 13 of the blade profile 1 and a pressure surface 14 of the blade profile 1 are respectively enclosed between the two sides of the steam inlet side 12 and the steam outlet side 11, so that steam can flow from the steam inlet side 12 to the steam outlet side 11 through the pressure surface 14, and high efficiency of the steam turbine is realized.
In order to satisfy the requirement that the steam expands after being accelerated and generates pressure drop, and further realize the conversion from heat energy to kinetic energy, in the embodiment, the steam inlet edge 12 is thickened, and the steam outlet edge 11 is thin and thin, so that the steam of the steam turbine is gradually reduced from the steam inlet edge 12 to the steam outlet edge 11.
As shown in fig. 2 and fig. 3, the blade profile 1 has a leading edge thickness 15 and a trailing edge thickness 16, the leading edge thickness 15 refers to the diameter of the leading edge, that is, the diameter of a circle in which a curve section formed by data points of an inner arc (a pressure surface 14) is tangent to a curve section formed by data points of a back arc (a suction surface 13) at a steam inlet end position (a leading edge position) on a cross section forming a channel of the blade profile 1; the trailing edge thickness 16 refers to the trailing edge diameter, that is, the diameter of a circle in which a curved section formed by data points of an inner arc (pressure surface 14) is tangent to a curved section formed by data points of a back arc (suction surface 13) at a steam outlet end position (trailing edge position) on a cross section forming a channel of the blade profile 1. Specifically, the thickness 15 of the front edge of the blade profile 1 is 0.8mm to 1mm, the thickness 16 of the tail edge of the blade profile 1 is 0.15mm to 0.19mm, in this embodiment, the thickness 15 of the front edge can be 0.8mm, and the thickness 16 of the corresponding tail edge can be 0.15 mm; the thickness of the front edge 15 can be 0.9mm, and the thickness of the corresponding tail edge 16 can be 0.15 mm; the thickness 15 of the front edge can be selected to be 1.0mm, the thickness 16 of the corresponding tail edge can be selected to be 0.19mm, and the high efficiency of the steam turbine can be realized by setting and matching the sizes of the thickness 15 of the front edge and the thickness 16 of the tail edge.
As shown in fig. 1, in order to facilitate the steam flow to flow from the moving blade to the stationary blade of the steam turbine, reduce the tendency of the flow to spread to both ends of the shroud 2 and the blade root 3, and further reduce the air leakage of the flow to both ends of the shroud 2 and the blade root 3, in the embodiment, an air inlet arc 17 is provided on the air inlet edge 12 in the height direction of the blade profile 1.
On the premise of limiting the efficiency reduction of the stationary blade, in order to simplify the processing industry of the stationary blade, in the embodiment, the profile of the blade profile 1 is a straight blade profile with a uniform cross section, that is, the profile line and the area of the blade profile 1 are the same along the blade height H1, so that the processing is convenient, the manufacturing cost is low, and the universality of the blade profile 1 is facilitated.
As shown in fig. 1, the shroud 2 is provided with adjacent high and low blade tips 21 and 22 to form a through-flow radial gap between the high and low blade tips 21 and 22, and a better through-flow radial gap is formed between the high and low blade tips 21 and 22 and the steam stop blades installed at the same position on the rotor of the steam turbine, and through-flow software simulation and actual use effect comparison, the shroud 2 provided with adjacent high and low blade tips 21 and 22 has a better steam sealing effect than the flat blade tip in the prior art, in this embodiment, the through-flow radial gap is 0.5 mm.
The steam inlet arc 17 is arranged on the steam inlet edge 12 in the height direction of the blade profile 1, and the shroud band 2 is provided with the adjacent high blade top 21 and the adjacent low blade top 22, so that the air leakage can be reduced, the steam sealing performance can be improved, and the efficiency of the steam turbine can be improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be covered by the present invention within the technical scope of the present invention, and the technical solution obtained by replacing or changing the technical idea of the present invention with equivalents.
Claims (6)
1. The utility model provides a high-efficient quiet blade is used to steam turbine which characterized in that: the blade type is formed by sequentially and smoothly transitioning an RON 1-RON 2 curve segment, an RON 2-RON 3 curve segment, an RON 3-RON 4 curve segment, an RON 4-RON 5 curve segment, an RON 5-RON 6 curve segment and an RON 6-RON 1 curve segment, the upper top end of the RON 6-RON 1 curve segment is provided with a steam outlet edge of the blade type, the lower top end of the RON 3-RON 4 curve segment is provided with a steam inlet edge of the blade type, and a suction surface of the blade type and a pressure surface of the blade type are respectively enclosed between the steam inlet edge and the two sides of the steam outlet edge.
2. The highly efficient stator blade for a steam turbine according to claim 1, wherein: the steam inlet edge is thickened, the steam outlet edge is thin, so that steam of the steam turbine is gradually reduced from the steam inlet edge to the steam outlet edge, the thickness of the front edge of the blade profile is 0.8-1 mm, and the thickness of the tail edge of the blade profile is 0.15-0.19 mm.
3. The highly efficient stator blade for a steam turbine according to claim 1, wherein: and an air inlet arc is arranged on the air inlet edge in the height direction of the blade profile.
4. The highly efficient stator blade for a steam turbine according to claim 1, wherein: the profile of the blade profile is a straight blade profile with a uniform section.
5. The highly efficient stator blade for a steam turbine according to claim 1, wherein: the shroud is provided with adjacent high blade tops and low blade tops so as to form a through-flow radial gap with a rotor steam-blocking sheet of the steam turbine.
6. The highly efficient stator blade for a steam turbine as claimed in claim 5, wherein: the through-flow radial clearance is 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123382149.5U CN216841825U (en) | 2021-12-29 | 2021-12-29 | High-efficient stator blade for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123382149.5U CN216841825U (en) | 2021-12-29 | 2021-12-29 | High-efficient stator blade for steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216841825U true CN216841825U (en) | 2022-06-28 |
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ID=82112243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123382149.5U Active CN216841825U (en) | 2021-12-29 | 2021-12-29 | High-efficient stator blade for steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216841825U (en) |
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2021
- 2021-12-29 CN CN202123382149.5U patent/CN216841825U/en active Active
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