CN212985301U - Nozzle set of steam turbine - Google Patents
Nozzle set of steam turbine Download PDFInfo
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- CN212985301U CN212985301U CN202021839044.0U CN202021839044U CN212985301U CN 212985301 U CN212985301 U CN 212985301U CN 202021839044 U CN202021839044 U CN 202021839044U CN 212985301 U CN212985301 U CN 212985301U
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- nozzle
- steam turbine
- nozzles
- outer ring
- steam
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Abstract
The utility model provides a nozzle group of a steam turbine, which comprises a plurality of nozzles, wherein the nozzles are fixed into a circumference shape by a clamping tool, and the nozzles form the nozzle group by welding; each nozzle comprises a nozzle outer ring, a nozzle inner ring and nozzle stationary blades, the nozzle outer ring, the nozzle inner ring and the nozzle stationary blades are of an integral structure, the nozzle stationary blades are located between the nozzle outer ring and the nozzle inner ring, and a steam flow channel is formed between every two adjacent nozzle stationary blades. The utility model provides a higher nozzle stator blade steam passage precision can be realized to steam turbine nozzle group.
Description
Technical Field
The utility model relates to a steam turbine technical field, in particular to steam turbine nozzle group
Background
The steam turbine uses steam with certain pressure and temperature as a working medium, the working principle is that new steam enters the steam turbine, flows through a nozzle and expands in the nozzle to obtain high-speed flowing steam, the steam flows through a moving blade on a steam turbine rotor to do work, and the moving blade drives the steam turbine rotor to rotate, so that energy conversion is realized.
Along with the increasing demand of the domestic power industry on variable-speed industrial steam turbines, the requirements on high efficiency, safety and reliability are raised more and more. The industrial steam turbine has the operating requirements of wide working condition variation range and excellent economical efficiency and safety, and the requirements are closely related to the adjusting stage nozzle group to a great extent, so that more restrictions are put on the adjusting stage nozzle group, and the thermal performance, the pneumatic performance, the strength characteristic and the like of the adjusting stage nozzle group must be considered.
The nozzle group of the existing steam turbine adopts two nozzle group structures, the first structure is a structure that a single milled nozzle blade is welded with an inner peripheral belt and an outer peripheral belt of a punching stationary blade and then is welded with the inner peripheral belt and the outer peripheral belt of the nozzle group, and because the steam pressure and the temperature at an adjusting stage are highest and different from other welding clapboards, the nozzle group with the structure has defects in the aspects of processing and assembling precision and safety stability compared with an integral nozzle group in practical use; the second is to forge the nozzle set integrally and then process the structure of the nozzle set steam passage by electric spark processing, which has long processing period and high processing cost.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art's defect, the utility model provides a steam turbine nozzle group to guarantee better through-flow efficiency, and shorten production cycle and reduce the processing cost greatly.
To achieve the above and other objects, the present invention provides a method for manufacturing a nozzle block of a steam turbine, comprising,
providing a plurality of nozzles;
fixing the plurality of nozzles through a clamping tool so as to form the plurality of nozzle groups into a circumferential shape;
forming the nozzle group by welding the plurality of nozzles;
each nozzle comprises a nozzle outer ring, a nozzle inner ring and nozzle stationary blades, the nozzle outer ring, the nozzle inner ring and the nozzle stationary blades are of an integral structure, the nozzle stationary blades are located between the nozzle outer ring and the nozzle inner ring, and a steam flow channel is formed between every two adjacent nozzle stationary blades.
Further, the method of manufacturing the plurality of nozzles includes,
providing a section bar;
machining the profile by end milling or horizontal milling to form the nozzle;
and machining the nozzle through rough milling and finish milling to form a clamping groove on the nozzle.
Further, the clamping groove is located on the nozzle outer ring.
Further, said fixing said plurality of nozzles by said clamping tool to form said plurality of nozzle groups in a circumferential shape comprises,
placing the clamping tool on the positioning boss;
and arranging the plurality of nozzles on the clamping tool through the clamping groove.
Further, the forming the nozzle group by welding the plurality of nozzles includes,
forming a plurality of welding grooves on the plurality of nozzles, wherein the plurality of welding grooves are respectively positioned on the nozzle outer ring and the nozzle inner ring;
and arranging solder in the welding grooves, welding, and performing heat treatment to form the nozzle group.
Furthermore, the nozzle group also comprises a plurality of nozzle separating ribs, the nozzle separating ribs are positioned among the nozzles, and each nozzle separating rib comprises a nozzle outer ring, a nozzle inner ring and a nozzle stationary blade.
Further, the joint surfaces of the plurality of nozzles are designed to be straight surfaces.
Further, the nozzle group is divided into a plurality of nozzle arc sections according to the joint surface, and the radian of each nozzle arc section is less than 180 degrees.
Further, the utility model provides a nozzle group of a steam turbine, which comprises,
a plurality of nozzles forming a circumferential nozzle group by welding;
each nozzle comprises a nozzle outer ring, a nozzle inner ring and nozzle stationary blades, the nozzle outer ring, the nozzle inner ring and the nozzle stationary blades are of an integral structure, the nozzle stationary blades are located between the nozzle outer ring and the nozzle inner ring, and a steam flow channel is formed between every two adjacent nozzle stationary blades.
Furthermore, the nozzle group also comprises a plurality of nozzle separating ribs, the nozzle separating ribs are positioned among the nozzles, and each nozzle separating rib comprises a nozzle outer ring, a nozzle inner ring and a nozzle stationary blade.
Furthermore, each nozzle comprises a clamping groove, and the clamping groove is positioned on the outer ring of the nozzle.
Further, a clamping tool is arranged in the clamping groove to form the plurality of nozzles into a full circle structure.
Furthermore, the joint surfaces of two adjacent nozzles comprise straight surfaces, and the nozzle stationary blades and the joint surfaces have preset distances.
Further, the turbine nozzle block is divided into a plurality of nozzle block arc segments according to the junction surface.
Further, each nozzle comprises a plurality of welding grooves, and the plurality of welding grooves are positioned on the nozzle outer ring and the nozzle inner ring.
Further, still include a plurality of nozzle spacer ribs, a plurality of nozzle spacer ribs are located between a plurality of nozzles.
Further, sealing keys are further arranged at two ends of the steam turbine nozzle group.
Furthermore, two ends of the steam turbine nozzle group are also provided with a seam-riding bolt.
To sum up, the utility model provides a steam turbine nozzle is through designing every nozzle into a body structure, is about to the nozzle outer loop, and nozzle inner ring and nozzle stationary blade form a body structure, improve the precision of nozzle from this, can also realize batch production simultaneously. The utility model discloses a welding process is fixed a plurality of nozzles, and production cycle is short, low in manufacturing cost. The utility model provides a steam turbine nozzle group structural strength is good, can guarantee that nozzle group satisfies the operating strength requirement, has improved the flow efficiency that steam passes through nozzle group, has improved the security and the stability of unit operation.
Drawings
FIG. 1: the present embodiment provides a flow chart of a method for manufacturing a turbine nozzle set.
FIGS. 2A-2D: the structure formed in step S1 is schematic.
FIGS. 3A-3D: fig. 2A-2D are expanded top views along the medial diameter.
FIG. 4: the nozzle in this embodiment is a schematic diagram of a circumferential structure.
FIG. 5: the welding structure of the nozzle group in this embodiment is schematically illustrated (as viewed from the steam inlet side).
FIG. 6: longitudinal section of the nozzle in this embodiment.
FIG. 7: longitudinal section of the finished nozzle in this example.
FIG. 8: the schematic view of the nozzle assembly in this embodiment is shown after assembly.
FIG. 9: the assembly of the sealing key in this embodiment is illustrated.
FIG. 10: the assembling of the riding screw in the embodiment is schematically shown.
FIG. 11: fig. 5 is a developed top view in the middle diameter direction.
FIG. 12: fig. 8 is a developed top view in the pitch diameter direction.
FIG. 13: the present embodiment presents a schematic view of a back pressure turbine.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
As shown in fig. 1, the present embodiment provides a method for manufacturing a turbine nozzle group, including:
s1: providing a plurality of nozzles;
s2: fixing the plurality of nozzles by a clamping tool;
s3: the nozzle group is formed by welding the plurality of nozzles.
As shown in fig. 2A-2D, in the present embodiment, the turbine nozzle set includes a plurality of nozzles, which may include, for example, a first nozzle 101, a second nozzle 102, a nozzle spacer 103, and a third nozzle 104. The first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 are connected in this order. The first nozzle 101 may, for example, be a first nozzle block and the third nozzle 104 may, for example, be a last nozzle block. In some embodiments, the first nozzle 101 may be, for example, a last nozzle block and the third module 104 may be, for example, a first nozzle block.
As shown in fig. 2A to 2D, in the present embodiment, the first nozzle 101 includes a nozzle outer ring 11, a nozzle inner ring 13, and nozzle vanes 12, and the nozzle vanes 12 are located between the nozzle outer ring 11 and the nozzle inner ring 13. When the first nozzle 101 is connected to the second nozzle 102, the nozzle vanes 12 in the first nozzle 101 and the nozzle vanes 12 in the second nozzle 102 form a steam flow path. The second nozzle 102, the nozzle spacer 103, and the fourth nozzle 104 each include a nozzle outer ring 11, a nozzle inner ring 13, and nozzle stationary blades 12, and the nozzle stationary blades 12 are located between the nozzle outer ring 11 and the nozzle inner ring 13. In the present embodiment, the nozzle outer ring 11, the nozzle stator blades 12, and the nozzle inner ring 13 are formed in an arc shape. The first nozzle 101 is further provided with a clamping groove 14, specifically, the clamping groove 14 is located on the nozzle outer ring 11, and the clamping groove 14 is used for fixing the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104.
As shown in fig. 2A to 2D, in step S1, in the present embodiment, the first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 are, for example, integrally formed, that is, the nozzle outer ring 11, the nozzle inner ring 13, and the nozzle stationary blades 12 are integrally formed. The manufacturing process of the first nozzle 101 will be described below by taking the first nozzle 101 as an example.
In manufacturing the first nozzle 101, a profile, which may be, for example, a blank square steel, is provided, and the profile is processed by other methods such as vertical milling or horizontal milling, for example, each surface of the blank square steel is processed by vertical milling or horizontal milling, the blank is removed, and then the outer nozzle ring 11, the stationary nozzle vanes 12, and the inner nozzle ring 13 are processed by numerical control vertical milling or numerical control horizontal milling. In this embodiment, the inlet and outlet surfaces of the nozzle outer ring 11 and the nozzle inner ring 13 of the first nozzle 101 may be processed by rough milling and finish milling, for example, and the assembly surface (i.e., the joint surface between two adjacent nozzles) of the first nozzle 101 needs to be rough milled and finish milled. After the nozzle outer ring 11 is formed, a clamping groove 14 is formed in the nozzle outer ring 11 by rough milling and finish milling. After the first nozzle 101 is formed, the first nozzle 101 can be polished, magnetic particle inspection can be performed after polishing, and then the first nozzle 101 is inspected to ensure the throat width dimension of the steam passage.
In the present embodiment, the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 have the same manufacturing method, and the manufacturing method of the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 is described in the present embodiment.
3A-3D, FIGS. 3A-3D show a top view of the first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 as viewed in a spread-out view along the medial axis. Nozzle joint surfaces are arranged on the first nozzle 101, the second nozzle 102, the nozzle spacer ribs 103 and the third nozzle 104, and can be designed into a Z shape, so that the sharp angle effect is avoided, and the nozzle has better strength. In this embodiment, the first nozzle 101 includes a first nozzle bonding surface 101a, the second nozzle 102 includes a second nozzle bonding surface 102a and a third nozzle bonding surface 102b, the nozzle spacer 103 includes a fourth nozzle bonding surface 103a and a fifth nozzle bonding surface 103b, and the third nozzle 104 includes a sixth nozzle bonding surface 104 a. When the first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 are assembled, the first nozzle bonding surface 101a is used in cooperation with the second nozzle bonding surface 102a, the third nozzle bonding surface 102b is used in cooperation with the fourth nozzle bonding surface 103a, and the fifth nozzle bonding surface 103b is used in cooperation with the sixth nozzle bonding surface 104 a. The inclusion of a straight face on the bonding face of each nozzle simplifies the machining process. It should be noted that, a certain distance is provided between the nozzle stationary blade of each nozzle and the nozzle joint surface, and it is ensured that no weld seam is present at the nozzle stationary blade steam passage, thereby avoiding the nozzle stationary blade steam passage from being deformed due to later welding and ensuring the precision of the steam passage.
As shown in fig. 4, in steps S2 to S3, in this embodiment, after the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are manufactured, the clamping tool is placed on a positioning boss or other fixing platform, then the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are sequentially fixed on the clamping tool, and the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are fixed on the clamping tool through the clamping groove 14 on the outer nozzle ring.
As shown in fig. 5 to 6, after the first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 are formed in a circumferential shape, the first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 are fixed by screws, and then weld grooves (not shown) are formed on the first nozzle 101, the second nozzle 102, the nozzle spacer 103, and the third nozzle 104 by lathing, the weld grooves being located on the nozzle outer ring 11 and the nozzle inner ring 13. After forming the solder groove, the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are taken down and burrs of the solder groove are cleaned, then the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are sequentially placed on the positioning boss, then placed in the solder groove through the solder 15, and then the nozzles are soldered through the soldering tool, taking the first nozzle 101 as an example in this embodiment. The first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are formed into a whole circle by welding, and the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 after the whole circle are subjected to post-welding heat treatment.
As shown in fig. 6-8, after the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are welded, the shape of each nozzle is finished, the margin of each joint surface is removed, and then the entire nozzle group 100 is divided into a plurality of nozzle arcs smaller than 180 ° according to actual needs, for example, the first nozzle arc I, the second nozzle arc II and the third nozzle arc III are sequentially arranged. The nozzle group 100 is cut according to the joint surface of each nozzle.
As shown in fig. 8, when installing, each steam chamber is installed with a corresponding nozzle arc, and the nozzle arc is used for guiding and adjusting the steam entering the through-flow part of the steam turbine through the steam turbine regulating valve.
As shown in fig. 8-9, in the present embodiment, the sealing keys 16 are disposed at two ends of the nozzle group 100, the sealing keys 16 may be disposed on the first nozzle 101 and the third nozzle 104, and each mating surface of the sealing key 16 has a margin, and during assembly, the sealing keys are ground and registered according to an assembly gap, so as to ensure the air tightness of the nozzle group 10 in the circumferential direction. In the present embodiment, the thermal expansion coefficient of the sealing key 16 is greater than that of the nozzle group 100, and the sealing key 16 expands at high temperature during operation, which is beneficial for better sealing.
As shown in fig. 10, in this embodiment, a seam screw 17 is respectively provided at both ends of the nozzle block 100 and at the fitting portion of the steam chamber, so that the nozzle block 100 is fixed to the steam chamber.
As shown in fig. 5 and fig. 11, the present embodiment provides a steam turbine nozzle set 100, and the steam turbine nozzle set 100 includes a plurality of nozzles, for example, a first nozzle 101, a second nozzle 102, a nozzle spacer 103, and a third nozzle 104. The first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are connected in sequence, in this embodiment, the first nozzle 101 is, for example, a first nozzle block, the third nozzle 104 is, for example, a last nozzle block, in some embodiments, the first nozzle 101 is, for example, a last nozzle block, and the third nozzle 104 is, for example, a first nozzle block.
As shown in fig. 11, fig. 11 is a plan view developed along the middle diameter of fig. 5, and in the present embodiment, a plurality of second nozzles 102 are provided between a first nozzle 101 and a nozzle spacer 103, a plurality of second nozzles 102 are provided between two nozzle spacers 103, and a plurality of second nozzles 102 are provided between the nozzle spacer 103 and a third nozzle 104, as described from the right to the left. The nozzle joint surface of the first nozzle 101 is used in cooperation with the nozzle joint surface of the second nozzle 102, the nozzle joint surface of the second nozzle 102 is used in cooperation with the nozzle joint surface of the nozzle spacer 103, and the nozzle joint surface of the nozzle spacer 103 is used in cooperation with the nozzle joint surface of the third nozzle 104. The nozzle engaging surfaces of the first nozzle 101, the second nozzle 102, the nozzle engaging surfaces of the nozzle spacers 103, and the third nozzle 104 can be seen in FIGS. 3C-3D.
As shown in fig. 8 and 12, after the first nozzle 101, the second nozzle 102, the nozzle spacer 103 and the third nozzle 104 are welded, the nozzle group 100 may be divided into a plurality of nozzle group arcs, for example, the nozzle group 100 may be divided into a first nozzle arc I, a second nozzle arc II and a third nozzle arc III. The first nozzle arc I, the second nozzle arc II and the third nozzle arc III can be divided, for example, by the nozzle junction surfaces of the individual nozzles. The first nozzle arc section I, the second nozzle arc section II and the third nozzle arc section III are arc structures with the angle less than 180 degrees. Seal keys 16 are further provided at both ends of the nozzle group 100, and the thermal expansion coefficient of the seal keys 16 is larger than that of the nozzle group 100. When the sealing key 16 is operated at high temperatures, a better seal is facilitated.
As shown in fig. 13, the back pressure turbine 30 of the present embodiment includes a cylinder 31, a nozzle set 32 is disposed in the cylinder 31, the cylinder 31 is a casing of the back pressure turbine 30, and pipes for steam admission, steam discharge, steam extraction and the like are connected to the outside of the cylinder 31.
In summary, the present embodiment provides a steam turbine nozzle set, which forms an integrated structure with a nozzle outer ring, a nozzle inner ring and nozzle stationary blades, so as to achieve a higher nozzle stationary blade steam passage precision, ensure a machining accuracy of a stationary blade steam passage profile, and achieve a higher energy conversion efficiency for the nozzle set.
The utility model discloses the design has clamping groove structure on each nozzle, and all nozzles pass through the clamping instrument fixed for the whole circle, and the welding between the nozzle is realized to the whole circle processing of nozzle inner ring and outer loop welding groove, and the passageway between two adjacent nozzle stationary blades constitutes steam flow way. The nozzle is fixed by using the clamping tool, so that the welding deformation can be reduced, and the precision of the nozzle is ensured.
The above description is only a preferred embodiment of the present application and the explanation of the applied technical principle, and it should be understood by those skilled in the art that the scope of the present application is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above technical features (but not limited to) having similar functions disclosed in the present application.
Besides the technical features described in the specification, other technical features are known to those skilled in the art, and further description of the other technical features is omitted here in order to highlight the innovative features of the present invention.
Claims (10)
1. A steam turbine nozzle block, comprising,
the nozzles are fixed into a circumferential shape through a clamping tool, and the nozzles form a nozzle group through welding;
each nozzle comprises a nozzle outer ring, a nozzle inner ring and nozzle stationary blades, the nozzle outer ring, the nozzle inner ring and the nozzle stationary blades are of an integral structure, the nozzle stationary blades are located between the nozzle outer ring and the nozzle inner ring, and a steam flow channel is formed between every two adjacent nozzle stationary blades.
2. The steam turbine nozzle block according to claim 1, further comprising a plurality of nozzle spacers positioned between said plurality of nozzles, each of said nozzle spacers comprising an outer nozzle ring, an inner nozzle ring, and a nozzle vane.
3. The turbine nozzle block of claim 2 wherein said nozzle spacer is of unitary construction.
4. The steam turbine nozzle block according to claim 1, wherein each of said nozzles includes a clamping slot located on said nozzle outer ring.
5. The steam turbine nozzle block according to claim 2, wherein the nozzle spacer includes a clamping groove in the nozzle outer ring.
6. The steam turbine nozzle block of claim 1, wherein the bonding surfaces of the plurality of nozzles comprise straight surfaces.
7. The steam turbine nozzle block according to claim 6, wherein said nozzle block is divided into a plurality of nozzle segments according to said combined surface.
8. The steam turbine nozzle block according to claim 7, wherein the arc of the plurality of nozzle segments is less than 180 °.
9. The steam turbine nozzle block according to claim 1, wherein both ends of the nozzle block are provided with sealing keys.
10. The steam turbine nozzle block according to claim 1, wherein both ends of the nozzle block are provided with a setscrew.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021839044.0U CN212985301U (en) | 2020-08-28 | 2020-08-28 | Nozzle set of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021839044.0U CN212985301U (en) | 2020-08-28 | 2020-08-28 | Nozzle set of steam turbine |
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| CN212985301U true CN212985301U (en) | 2021-04-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113579661A (en) * | 2021-08-23 | 2021-11-02 | 成都市新美加机械设备制造有限公司 | Partition plate processing technology |
| CN115194416A (en) * | 2022-08-18 | 2022-10-18 | 哈尔滨汽轮机厂有限责任公司 | Nozzle blade machining method |
-
2020
- 2020-08-28 CN CN202021839044.0U patent/CN212985301U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113579661A (en) * | 2021-08-23 | 2021-11-02 | 成都市新美加机械设备制造有限公司 | Partition plate processing technology |
| CN115194416A (en) * | 2022-08-18 | 2022-10-18 | 哈尔滨汽轮机厂有限责任公司 | Nozzle blade machining method |
| CN115194416B (en) * | 2022-08-18 | 2023-09-29 | 哈尔滨汽轮机厂有限责任公司 | Nozzle blade machining method |
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