CN110953022B - Steam turbine nozzle set and six-arc-section full-circumference steam inlet type nozzle structure - Google Patents
Steam turbine nozzle set and six-arc-section full-circumference steam inlet type nozzle structure Download PDFInfo
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- CN110953022B CN110953022B CN201911163762.2A CN201911163762A CN110953022B CN 110953022 B CN110953022 B CN 110953022B CN 201911163762 A CN201911163762 A CN 201911163762A CN 110953022 B CN110953022 B CN 110953022B
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- block
- tail
- steam
- connecting block
- outer ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/047—Nozzle boxes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a steam turbine nozzle group and a six-arc-section full-circumference steam inlet type nozzle structure.A first block, a middle block and a tail block are sequentially arranged from left to right, the middle block comprises an inner ring, an outer ring and a plurality of static blades welded between the inner ring and the outer ring, and a steam channel is formed between the end surfaces of the two static blades; the first block comprises a first connecting block connected with the inner ring of the middle block and a second connecting block connected with the outer ring, a first block sealing block is arranged between the first connecting block and the second connecting block, and the shape of the end face of the first block sealing block connected with the middle block is consistent with that of the end face of the stationary blade; the tail block comprises a third connecting block connected with the inner ring of the middle block and a fourth connecting block connected with the outer ring, the third connecting block and the fourth connecting block are provided with tail block sealing blocks, and the shape of the connecting end face of each tail block sealing block and the shape of the connecting end face of the middle block are consistent with the shape of the end face of each stationary blade. The nozzle group and the nozzle structure optimize the design of the first block and the tail block in structure, can meet the sealing property and improve partial steam admission degree, and therefore the economy of the steam turbine is improved.
Description
Technical Field
The invention belongs to the field of power generation of a steam turbine of a conventional thermal power generating unit, and relates to a steam turbine nozzle set and a six-arc-section full-circumference steam inlet type nozzle structure.
Background
A conventional thermal power generating unit steam turbine adopts a nozzle steam inlet mode, and in order to ensure the operating economy of the unit, the structure of the steam turbine needs to meet the requirements of tight sealing between nozzle unit sections and high partial steam inlet degree. However, the conventional nozzle structure adopts the mode of the first block, the tail block and the middle block for the sealing performance among the nozzle groups, but the design structures of the first block and the tail block in the existing design are too large, the structures are random, and the partial steam admission degree is greatly reduced, so that the economical efficiency of the steam turbine is reduced.
Disclosure of Invention
The technical problem solved by the invention is as follows: the application provides a six-arc-section full-circumference steam admission type nozzle, optimizes the design of a first block and a tail block in structure, can meet the sealing property and improve partial steam admission degree, thereby improving the economical efficiency of a steam turbine.
The technical scheme adopted by the invention is as follows:
a nozzle group of a steam turbine is sequentially provided with a first block, a middle block and a tail block from left to right, wherein the middle block comprises an inner ring, an outer ring and a plurality of fixed blades welded between the inner ring and the outer ring, a steam passage is formed between the end faces of the two fixed blades, the first block comprises a first connecting block connected with the inner ring of the middle block and a second connecting block connected with the outer ring of the middle block, a first block sealing block is arranged between the first connecting block and the second connecting block, and the shape of the end face of the first sealing block connected with the middle block is consistent with that of the end face of the fixed blade; the tail block comprises a third connecting block connected with the inner ring of the middle block and a fourth connecting block connected with the outer ring of the middle block, a tail block sealing block is arranged between the third connecting block and the fourth connecting block, and the shape of the connecting end surface of the tail block sealing block and the shape of the middle block are consistent with the shape of the end surface of the stationary blade.
Preferably, the width of the first closing block is the width of one stationary blade.
Preferably, the width of the tail block closing block is the width of two stationary vanes and a steam passage.
Preferably, the first block, the inner ring, the outer ring and the tail block are integrally formed.
Preferably, the first connecting block and the second connecting block of the first block are provided with keys connected with the cylinder spacer rib, and the third connecting block and the fourth connecting block of the tail block are provided with pins connected with the cylinder spacer rib.
A six-arc-section full-circumference steam inlet type nozzle structure comprises an upper arc section and a lower arc section, wherein the upper arc section and the lower arc section are symmetrical; go up the arc section and include two sections intermediate blocks that connect through a tail piece, one of them the other end of intermediate block is provided with first piece, another intermediate block with one the tail piece cooperation of nozzle group is connected, nozzle group is including the first piece that connects gradually, intermediate block and tail piece.
According to the invention, the shape of the connecting end face of the first closed block and the middle block in the first block is designed to be consistent with the shape of the end face of the static blade, and the shape of the connecting end face of the tail closed block and the middle block is designed to be consistent with the shape of the end face of the static blade, so that the steam inlet channel of the nozzle group can be increased, and the steam inlet degree is improved.
Drawings
FIG. 1 is a six arc full perimeter admission nozzle configuration of the present invention;
FIG. 2 is a cross-sectional view C-C of FIG. 1;
FIG. 3 is a schematic view of the structure of the head block and a cross-sectional view A-A of the head block;
FIG. 4 is a schematic view showing the connection of stationary blades to inner and outer rings and a sectional view A-A thereof;
FIG. 5 is a schematic structural diagram of the end block and an A-A cross-sectional view of the end block.
In the figure, 1-inner ring, 2-outer ring, 3-stationary blade, 4-steam passage, 5-first block, 51-first connecting block, 52-second connecting block, 53-first block closed block, 6-tail block, 61-third connecting block, 62-fourth connecting block, 63-tail block closed block, 7-key, 8-pin and 9-cylinder spacer rib.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Example 1
A steam turbine nozzle group is provided with a first block 5, a middle block and a tail block 6 in sequence from left to right as shown in FIGS. 1-5, wherein the middle block comprises an inner ring 1, an outer ring 2 and a plurality of stationary blades 3 welded between the inner ring 1 and the outer ring 2, a steam passage 4 is formed between the end faces of the two stationary blades 3, the first block 5 comprises a first connecting block 51 connected with the inner ring 1 of the middle block and a second connecting block 52 connected with the outer ring 2 of the middle block, a first sealing block 53 is arranged between the first connecting block 51 and the second connecting block 52, and the shape of the end face of the first sealing block 53 connected with the middle block is consistent with the shape of the end face of the stationary blade 3; the tail block 6 comprises a third connecting block 61 connected with the inner ring 1 of the middle block and a fourth connecting block 62 connected with the outer ring 2 of the middle block, a tail block sealing block 63 is arranged between the third connecting block 61 and the fourth connecting block 62, and the shape of the connecting end face of the tail block sealing block 63 and the middle block is consistent with that of the end face of the stationary blade. The invention provides a steam turbine nozzle, which comprises a first block 5, a middle block and a tail block 6 from left to right in sequence, the middle block comprises an inner ring 1, an outer ring 2 and a plurality of stationary vanes 3 welded between the inner ring 1 and the outer ring 2, a steam passage 4 is formed between the end faces of the two stationary blades 3, which is a steam passage of the nozzle group, and the structures of the inner ring 1, the outer ring 2 and the stationary blades 3 are well known to those skilled in the art, not described in detail, in the present invention, the first block 5 comprises a first connecting block 51 connected to the inner ring 1 of the intermediate block and a second connecting block 52 connected to the outer ring 2 of the intermediate block, a first sealing block 53 is arranged between the first connecting block 51 and the second connecting block 52, and the shape of the end face of the first sealing block 53 connected with the middle block is consistent with the shape of the end face of the stationary blade 3; the tail block 6 comprises a third connecting block 61 connected with the inner ring 1 of the middle block and a fourth connecting block 62 connected with the outer ring 2 of the middle block, a tail block sealing block 63 is arranged between the third connecting block 61 and the fourth connecting block 62, the shape of the connecting end surface of the tail block sealing block 63 and the middle block is consistent with that of the end surface of the stationary blade 3, and in the invention, by setting the shape of the connecting end surface of the first sealing block 53 and the middle block to be consistent with that of the end surface of the stationary blade 3, the end surface of the first stationary blade 3 connected with the first block 5 of the middle block and the end surface of the first sealing block 53 of the first block 5 can form a steam passage 4; similarly, the shape of the end face of the tail block closing block 63 connected with the middle block is consistent with the shape of the end face of the stationary blade 3, and the end face of the first stationary blade 3 connected with the tail block 6 of the middle block and the end face of the tail block closing block 63 of the tail block can form a steam passage 4, so that the first block 5 and the tail block 6 are optimized, the steam passage 4 is formed between the first block 5 and the stationary blade 3, the steam inlet degree can be met, the sealing performance can be met, and the economy of the whole steam turbine is improved.
Example 2
Based on the above embodiment 1, as shown in fig. 2 and 3, the width of the first closing block 53 is the width of one stationary blade 3. In the present embodiment, the width of the first closing block 53 is the width of one stationary blade 3, so that the size of the first block 5 can be reduced to the maximum, and the function of closing between two chambers can be achieved.
Example 3
Based on the above embodiment 2, as shown in fig. 2 and 5, the width of the tail block closing block 63 is the width of two stationary blades 3 and one steam passage 4. In the present embodiment, the width of the tail block closing block 63 is the width of two stationary blades 3 and one steam passage 4. Therefore, the structure of the tail block closing block 63 can be equivalent to the structure of the two stationary blades 3 forming the steam path 4 in parallel in the intermediate block, and this structure can satisfy both the requirements of the mounting structure of the nozzle group and the sealing of the nozzle group, while the structure of the tail block 6 can be minimized.
Example 4
Based on the above embodiments 1-3, the first block 5, the inner ring 1, the outer ring 2 and the end block 6 are integrally formed. The first block 5, the inner ring 1, the outer ring 2 and the tail block 6 are integrally formed, so that the processing and forming of the nozzle group can be facilitated, and the nozzle group can be conveniently assembled to form a nozzle structure.
Example 5
Based on the embodiment 4, as shown in fig. 1 and 2, the first connecting block 51 and the second connecting block 52 of the first block 5 are provided with the key 7 connected with the cylinder spacer 10, and the third connecting block 61 and the fourth connecting block 62 of the tail block 6 are provided with the pin 8 connected with the cylinder spacer 10. In this embodiment, the first connecting block 51 and the second connecting block 52 of the first block 5 are provided with keys 7 connected with the cylinder spacer ribs 10, and the third connecting block 61 and the fourth connecting block 62 of the tail block 6 are provided with pins 8 connected with the cylinder spacer ribs 10, which are used for connecting the nozzle group to the cylinder of the steam turbine. In the present embodiment, the key 7 and the pin 8 are common key and pin members for key connection and pin connection of nozzle groups and cylinders in steam turbines, which are well known to those skilled in the art, and therefore, will not be described in detail herein.
Example 6
Based on the above embodiment 5, as shown in fig. 1 and fig. 2, a six-arc-section full-circumference steam inlet nozzle structure comprises an upper arc section and a lower arc section, wherein the upper arc section and the lower arc section are symmetrical; go up the arc section and include two sections intermediate blocks that connect through a tail piece 6, one of them the other end of intermediate block is provided with first piece 5, another with one of intermediate block the tail piece 6 cooperation of nozzle group is connected, nozzle group is including the first piece 5, intermediate block and the tail piece 6 that connect gradually. In this embodiment, a specific six-arc-section full-circumference steam inlet type nozzle structure assembled by using the turbine nozzle group includes an upper arc section and a lower arc section, and the upper arc section and the lower arc section are symmetrical; the upper arc section comprises two sections of middle blocks connected through a tail block 6, namely the two middle blocks are separated at intervals only by arranging the tail block 6, one middle block is provided with a first block 5, the other middle block is matched and connected with the tail block 6 of a nozzle group, and the nozzle group comprises the first block 5, the middle block and the tail block 6 which are sequentially connected; the design of the upper arc section reduces the use of the first block 5 and the tail block 6, so that the length of the middle block can be increased, the steam passage 4 is increased, the steam admission degree of the whole six-arc-section full-circumference steam admission type nozzle structure is increased, and the structure of the lower arc section is symmetrical to that of the upper arc section, so that the use of the first block 5 and the tail block 6 is also reduced in the lower arc section, and the steam passage 4 can be increased; therefore, the six-arc-section full-circumference steam inlet type nozzle structure in the embodiment can further increase the steam passage 4 of the whole nozzle structure, and improve the steam inlet degree of the nozzle structure, so that the economy of the steam turbine is 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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (5)
1. A nozzle group of a steam turbine is provided with a first block, a middle block and a tail block in sequence from left to right, wherein the middle block comprises an inner ring, an outer ring and a plurality of static blades welded between the inner ring and the outer ring, and a steam passage is formed between the end faces of the two static blades; the tail block comprises a third connecting block connected with the inner ring of the middle block and a fourth connecting block connected with the outer ring of the middle block, a tail block sealing block is arranged between the third connecting block and the fourth connecting block, and the shape of the connecting end surface of the tail block sealing block and the middle block is consistent with that of the end surface of the stationary blade;
the width of the first closed block is the width of one stationary blade.
2. The steam turbine nozzle block as claimed in claim 1, wherein the width of the tail block closing block is the width of two stationary vanes and one steam passage.
3. The steam turbine nozzle block as claimed in claim 1 or 2, wherein the first block, the inner ring, the outer ring and the tail block are integrally formed.
4. The steam turbine nozzle block according to claim 3, wherein the first connecting block and the second connecting block of the first block are provided with keys connected with the cylinder spacer ribs, and the third connecting block and the fourth connecting block of the tail block are provided with pins connected with the cylinder spacer ribs.
5. The nozzle group structure according to claim 1 or 2, wherein a six-arc full-circumference steam inlet type nozzle structure is assembled, and is characterized by comprising an upper arc section and a lower arc section, wherein the upper arc section and the lower arc section are symmetrical; go up the arc section and include two sections intermediate blocks that connect through a tail piece, one of them the other end of intermediate block is provided with first piece, another the intermediate block with the tail piece cooperation of a steam turbine nozzle group be connected, nozzle group is including the first piece, intermediate block and the tail piece that connect gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911163762.2A CN110953022B (en) | 2019-11-25 | 2019-11-25 | Steam turbine nozzle set and six-arc-section full-circumference steam inlet type nozzle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911163762.2A CN110953022B (en) | 2019-11-25 | 2019-11-25 | Steam turbine nozzle set and six-arc-section full-circumference steam inlet type nozzle structure |
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| CN110953022A CN110953022A (en) | 2020-04-03 |
| CN110953022B true CN110953022B (en) | 2022-05-10 |
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| CN201911163762.2A Active CN110953022B (en) | 2019-11-25 | 2019-11-25 | Steam turbine nozzle set and six-arc-section full-circumference steam inlet type nozzle structure |
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| CN114109520A (en) * | 2020-08-28 | 2022-03-01 | 上海汽轮机厂有限公司 | Method for manufacturing steam turbine nozzle set and steam turbine nozzle set formed by same |
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