CN218542328U - Novel blade with crown shroud - Google Patents
Novel blade with crown shroud Download PDFInfo
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- CN218542328U CN218542328U CN202223151434.0U CN202223151434U CN218542328U CN 218542328 U CN218542328 U CN 218542328U CN 202223151434 U CN202223151434 U CN 202223151434U CN 218542328 U CN218542328 U CN 218542328U
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Abstract
The utility model relates to a steam turbine blade technical field specifically discloses a novel from blade of taking coronal shroud, including connector, rigid coupling blade body on the connector and the blade root of locating the connector below, blade root, connector and blade body are by lower supreme die forging one-tenth an organic whole, the top rigid coupling of blade body has the blade body from the shroud and locates the buckle shroud of blade body from the shroud top, and the blade body is equipped with a plurality of connecting pieces that carry out the connection with the blade body from shroud and buckle shroud on the shroud from the shroud, and the leaf is turned round for the variable cross section to the molded lines of blade body, takes place the relative torsion between adjacent two cross sections, and the cross sectional area of blade body from root to top reduces gradually, has optimized the blade body and the shroud structure of traditional blade, improves the pneumatic efficiency of blade, makes the unit operation more high-efficient, safety.
Description
Technical Field
The application relates to the technical field of steam turbine blades, and particularly discloses a novel blade with a crown shroud.
Background
In order to solve the matching problem of the conventional power system in the links of power generation, power transmission and distribution and power utilization and improve the economy and safety of the conventional power system, in recent years, an advanced compressed air energy storage system which has the advantages of high efficiency, environmental friendliness, large-scale application, no geographical position limitation and the like is rapidly developed. Along with the improvement of the power grade of an energy storage system, the mass/volume flow of required high-pressure air is increased, and the exhaust area of an energy storage turbine is larger and larger, so that the length of a last-stage moving blade is increased, the problems of structural stress increase, blade profile twisting and reversion shape increase, blowing loss caused by an irregular shroud band, blade resonance damage and the like caused by the increase of the length of the blade directly influence the energy conversion efficiency and the safety and stability of operation of the turbine, and the problems frequently occur in the development process of thermal power generation, nuclear power generation and industrial dragging steam turbine units. The turbine blade bears obvious alternating load, and the air density of the through flow of the last-stage moving blade under the low-load working condition is far greater than the steam density of the last stage of the steam turbine, so that the blowing effect and the air flow exciting force of the blade are much stronger than that of the last-stage moving blade of the steam turbine, and higher requirements are provided for the structural design of the last-stage moving blade of the energy storage turbine. In addition, the exhaust of the compressed air energy storage system turbine directly enters the atmospheric environment, the exhaust pressure and the density are far higher than those of a steam turbine set, and if a non-shroud structure of a last-stage moving blade of the steam turbine set is adopted, great blade tip leakage loss can be generated, and the energy conversion efficiency of the set and the system is influenced.
Accordingly, the present inventors have devised a novel self-crowned shroud blade to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an aim at optimizes the blade body and the shroud structure of traditional blade, improves the pneumatic efficiency of blade, makes the problem of unit operation high efficiency, safety more.
In order to achieve the purpose, the basic scheme of the utility model provides a novel blade with a crown shroud, which comprises a connecting body, a blade body fixedly connected on the connecting body and a blade root arranged below the connecting body, wherein the blade root, the connecting body and the blade body are forged into a whole from bottom to top;
the molded line of the blade body is a twisted blade with variable cross sections, relative twisting occurs between two adjacent cross sections, and the cross section area of the blade body from the root to the top is gradually reduced.
The principle and effect of this basic scheme lie in:
1. compared with the prior art, the utility model discloses be equipped with the blade body from shroud and buckle shroud, through setting up the assembly of the blade body of being convenient for of blade body from the shroud, form the whole circle through the buckle shroud and connect, when the blade takes place to vibrate in the operation process, the vibration energy of the relative sliding effect blade that takes place between buckle shroud and blade self shroud contact surface reduces blade vibration stress to improve the life-span of blade and the fail safe nature of operation.
2. Compared with the prior art, the utility model discloses the bayonet socket shroud that is equipped with has replaced traditional integrated into one piece's arch shroud, has reduced the concentrated stress that the connecting piece caused, becomes integrative with blade body and blade body from the shroud die forging, has avoided the condition that the regulation level shroud that former blade probably appears drops, has avoided the security risk to combine the security and the high efficiency of turboset blade design simultaneously organically, makes the blade have higher variable operating mode performance to guarantee the unit under the variable operating mode, safe efficient operation.
3. Compared with the prior art, the molded lines of the blade body are set as variable-section twisted blades, relative twisting occurs between two adjacent sections, the sectional area of the blade body from the root to the top is gradually reduced, the rigidity of the blade can be effectively improved, and the safety coefficient of the operation of the blade is improved.
Furthermore, a plurality of dovetail grooves are formed in the upper surface of the self-surrounding band of the blade body, and the connecting piece is installed in the dovetail grooves in a welding or clamping mode. The blade body is provided with the dovetail groove, and the connecting piece is clamped into the dovetail groove for connection, so that the connecting strength of the connecting piece is improved conveniently.
Furthermore, the buckle shroud ring comprises a plurality of buckle units which are connected end to end, and a bayonet through which a connecting piece can pass is formed in the center of each buckle unit. The bayonet is arranged for the connecting piece to penetrate through and fix the buckle surrounding belt.
Furthermore, a groove is formed in one end of the buckle unit, a clip capable of being clamped into the groove of the adjacent bayonet unit is arranged at the other end of the buckle unit, and the clip is matched with the groove.
Furthermore, a stellite alloy sheet or a laser solid solution strengthening blade is attached to the air inlet side of the upper part of the blade body.
Further, a laser alloying layer is attached to the gas outlet side of the lower portion of the blade body. The laser alloying layer can be used for preventing the blade from water erosion, so that the safety of the blade body is improved.
Furthermore, the side wall of the blade root is provided with a plurality of connecting holes for fixing the blade root.
Further, the butt joint assembly gap between the adjacent buckling units is alpha, and the alpha is smaller than 0.25mm. The method is used for avoiding blast loss in the operation process, and the isentropic efficiency of the impeller is higher due to the comprehensive effect.
Further, an impeller is installed on the blade root, and the blade root is connected with the impeller through a pin.
Further, the maximum thickness of the buckle surrounding belt does not exceed 12mm.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a novel self-shrouded bucket according to an embodiment of the present application;
FIG. 2 is a partial schematic structural view of a novel self-shrouded bucket according to an embodiment of the present application;
fig. 3 shows a schematic structural diagram of a part a of a novel self-crown shroud blade according to an embodiment of the present application.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Reference numerals in the drawings of the specification include: the blade comprises a connecting body 1, a blade body 2, a blade root 3, a blade body self-surrounding band 4, a buckling surrounding band 5, a buckling unit 501, a bayonet 502, a groove 503, a clamp 504, a connecting piece 6, a dovetail groove 7, a stellite alloy sheet 8, a laser alloying layer 9 and an impeller 10.
A novel blade with a self-crown shroud is disclosed, and an embodiment is shown in figures 1, 2 and 3: the die forging type blade comprises a connector 1, a blade body 2 fixedly connected to the connector 1 and a blade root 3 arranged below the connector 1, wherein the blade root 3, the connector 1 and the blade body 2 are die forged into a whole from bottom to top, the blade body 2 is made of 14Cr12Ni3Mo2VN steel, the top of the blade body 2 is integrally connected with a blade body self-surrounding belt 4, a plurality of connecting pieces 6 for connecting the blade body self-surrounding belt 4 with a buckle surrounding belt 5 are arranged on the blade body self-surrounding belt 4, and the connecting pieces 6 can be rivets or connecting bolts; a buckle shroud band 5 is arranged above the blade body self-shroud band 4, and the maximum thickness of the buckle shroud band 5 is not more than 12mm; the buckle shroud ring 5 comprises a plurality of buckle units 501 connected end to end, a bayonet 502 capable of allowing the connecting piece 6 to pass through is arranged in the center of each buckle unit 501, a groove 503 is formed in one end of each buckle unit 501, a clamp 504 capable of being clamped into the groove 503 of the adjacent bayonet 502 unit is arranged at the other end of each buckle unit 501, the clamp 504 is matched with the groove 503, the butt joint assembling gap between the adjacent buckle units 501 is alpha, and the alpha is smaller than 0.25mm; the blade body is provided with a plurality of dovetail grooves 7 from the upper surface of the shroud ring 4, and the connecting piece 6 is arranged in the dovetail grooves 7 in a welding or clamping mode. The air inlet side of the upper part of the blade body 2 is adhered with a stellite alloy sheet 8 or a laser solid solution strengthened blade, so that the structure of the blade body 2 is strengthened, and the service life is prolonged; the gas outlet side of the lower part of the blade body 2 is adhered with the laser alloying layer 9, and the laser alloying layer 9 can be used for preventing the blade from water erosion in the using process, so that the safety of the blade body 2 is improved.
The molded line of the blade body 2 is a variable cross-section twisted blade, relative twisting occurs between two adjacent cross sections, the area of the cross section of the blade body 2 from the bottom to the top is gradually reduced, the side wall of the blade root 3 is provided with a plurality of connecting holes for fixing the blade root 3, and the blade root 3 is fixed in the wheel groove of the impeller 10 by penetrating through the connecting holes through pins.
The utility model discloses in the implementation, carry out the roll extrusion to connecting piece 6 through the roller press, through deforming 6 roll extrusions of connecting piece, with buckle shroud 5 and blade body from shroud 4 zonulae occludens together, the blade body is from the assembly of shroud 4 blade body 2 of being convenient for, form the whole circle through buckle shroud 5 and connect, when the blade takes place the vibration in the operation process, the vibration energy of the relative sliding effect blade that takes place between buckle shroud 5 and blade self shroud contact surface reduces blade vibration stress, thereby improve the life-span of blade and the fail safe nature of operation. Meanwhile, the bayonet 502 shroud ring replaces the conventional integrally formed shroud ring, the concentrated stress caused by the connecting piece 6 is reduced, the molded line of the blade body 2 is set to be a variable-section twisted blade, relative twisting occurs between two adjacent sections, the sectional area of the blade body 2 from the root to the top is gradually reduced, the rigidity of the blade can be effectively improved, and the safety coefficient of the blade in operation is improved. The blade body 2 and the blade body self-surrounding belt 4 are forged into a whole, the blade body self-surrounding belt 4 falling condition possibly occurring on the blade is avoided, the safety risk is avoided, meanwhile, the safety and the high efficiency of the design of the turbine unit blade are organically combined, the blade is enabled to have high variable working condition performance, and therefore the unit is guaranteed to operate safely and efficiently under variable working conditions. The blade body 2 and the shroud structure of traditional blade have been optimized, improve the pneumatic efficiency of blade, make the unit operation more high-efficient, safety.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.
Claims (10)
1. A novel blade with a crown shroud is characterized in that: the die forging device comprises a connector, a blade body fixedly connected to the connector and a blade root arranged below the connector, wherein the blade root, the connector and the blade body are die forged into a whole from bottom to top;
the molded line of the blade body is a twisted blade with variable cross sections, relative twisting occurs between two adjacent cross sections, and the cross section area of the blade body from the root to the top is gradually reduced.
2. The novel self-shrouded blade according to claim 1 wherein the blade body has dovetail grooves on the upper surface of the shroud, and the connecting member is mounted in the dovetail grooves by welding or clamping.
3. The novel self-crown shroud blade of claim 1, wherein said snap shroud includes a plurality of end-to-end snap units, said snap units having a central bayonet for receiving a connector therethrough.
4. The novel self-crown shroud vane as claimed in claim 3, wherein one end of said snap unit is grooved, and the other end of said snap unit is provided with a clip for clipping into the groove of an adjacent bayonet unit, said clip fitting into the groove.
5. The novel blade with the crown shroud as claimed in claim 1, wherein a stellite sheet or a laser solid solution strengthened blade is attached to the air inlet side of the upper part of the blade body.
6. The novel blade with the self-crown shroud as claimed in claim 5, wherein a laser alloying layer is attached to the gas outlet side of the lower part of the blade body.
7. The novel self-crown shroud blade as claimed in claim 3, wherein said blade root has attachment holes in its side wall for attachment of the blade root.
8. The novel self-crown shroud vane as claimed in claim 4, wherein the butt fit clearance between adjacent said snap units is α, α being less than 0.25mm.
9. The novel self-shrouded blade according to claim 1 wherein said blade root has an impeller mounted thereon, said blade root and impeller being connected by a pin.
10. The novel self-shrouded blade according to any of claims 1 to 8 wherein the maximum thickness of the snap shroud does not exceed 12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223151434.0U CN218542328U (en) | 2022-11-25 | 2022-11-25 | Novel blade with crown shroud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223151434.0U CN218542328U (en) | 2022-11-25 | 2022-11-25 | Novel blade with crown shroud |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218542328U true CN218542328U (en) | 2023-02-28 |
Family
ID=85265764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223151434.0U Active CN218542328U (en) | 2022-11-25 | 2022-11-25 | Novel blade with crown shroud |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218542328U (en) |
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2022
- 2022-11-25 CN CN202223151434.0U patent/CN218542328U/en active Active
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