High-temperature-resistant steam turbine blade
By building a drainage blade roller structure in the turbine blades, heat exchange is performed by airflow introduction and extraction, the problem of degradation of blade material performance at high temperatures is solved, extending the service life of the blades and improving mechanical properties.
Patent Information
- Application Number
- CN202323608519.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-28
AI Technical Summary
The material performance of the turbine blades in high temperature environments decreases, resulting in reduced tensile, torsional and fatigue resistance, changes in tissue structure and high-temperature creep failure, affecting service life.
The blade structure with built-in drainage blade roller is adopted, and the flow is drained through local air holes during rotation, external airflow is introduced and heat flow is vertically drawn out, so as to achieve continuous heat exchange and cooling inside the blade.
It effectively extends the service life of the turbine blades, improves the mechanical properties in high temperature environments, and reduces the thermal stress damage of the material.
Smart Images
Figure CN222296316U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of steam turbine blades, and in particular relates to a high-temperature resistant steam turbine blade. Background Art
[0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work. It is also called a steam turbine. It is mainly used as a prime mover for power generation. It can also directly drive various pumps, fans, compressors and ship propellers, etc. The exhaust steam or intermediate extraction steam of the steam turbine can also be used to meet the heating needs of production and life.
[0003] The blades of steam turbine are important components of steam turbine generator sets. The working environment of steam turbine blades is complex and changeable. They are subjected to high temperature, high pressure, huge centrifugal force, steam force, steam oscillation force, corrosion and water drop erosion in wet steam zone under extremely harsh conditions. Under high temperature, the mechanical properties of metal steam turbine blades will be significantly reduced, mainly manifested in the reduction of tensile, torsion and fatigue resistance of the material. However, when the blades are under high temperature conditions for a long time, the internal organizational structure of the blades will change, resulting in the production and polymerization of intercrystalline voids, resulting in high temperature creep damage, which greatly affects the service life of the blades.
[0004] Therefore, the utility model provides a high-temperature resistant steam turbine blade. The application adopts a blade structure with a built-in drainage impeller. Local air hole drainage is performed during the rotation of the steam turbine blade, and the built-in impeller is given a continuous heat exchange installation structure. The external airflow can be introduced into the interior of the blade body, and the heat flow can be led out in a vertical drainage manner, thereby ultimately achieving a heat exchange effect. Summary of the invention
[0005] In order to achieve the above object, the technical solution of the utility model is as follows:
[0006] A high temperature resistant steam turbine blade, comprising a blade root; the top of the blade root is integrally connected with a blade ridge, and the left and right sides of the blade ridge are integrally connected with auxiliary blades and main blades;
[0007] The blade spine is provided with a plurality of drainage holes along the end surface of the main blade, a drainage blade roller is inserted into the blind hole provided in the center of the blade spine, and the drainage channel of the drainage blade roller is connected with the drainage hole;
[0008] The auxiliary blade and the main blade are provided with two groups of output holes along the blade body direction, and the output holes are communicated with the drainage channel of the drainage blade roller.
[0009] Furthermore, a bearing is mounted on the top of the guide blade roller, a cover is fixedly mounted on the top of the bearing, and the bottom end surface of the cover is sealed and docked with the top end surface of the blade ridge.
[0010] Furthermore, the guide blade roller body is composed of three groups of roller blades and one group of sleeve shafts, and the outer ring of the sleeve shaft is integrally distributed with three groups of roller blades, and the three groups of roller blades are evenly distributed.
[0011] A guide protrusion is fixedly mounted on the bottom of the guide blade roller, and the guide protrusion is in guiding docking with the base.
[0012] Furthermore, a guide shaft is vertically installed at the center of the base, and the guide shaft is vertically inserted into the shaft hole of the sleeve shaft.
[0013] Furthermore, the upper end surface of the base is in a groove structure, which is complementary to the guide protrusion structure, and the outer ring of the root of the guide protrusion is fixedly connected with a dust ring, and the dust ring is sealed at the top opening of the base.
[0014] Furthermore, a sealing ring is installed at the junction of the guide blade roller and the bearing.
[0015] The beneficial effects of the utility model are:
[0016] Compared with the prior art, the utility model adopts a high-temperature resistant steam turbine blade. The application adopts a blade structure with a built-in drainage impeller. Local air hole drainage is performed during the rotation of the steam turbine blade, and the built-in impeller is given a continuous heat exchange installation structure. The external airflow can be introduced into the interior of the blade body, and the heat flow can be led out in a vertical drainage manner, ultimately achieving a heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The utility model is a schematic structural diagram of a high temperature resistant steam turbine blade.
[0018] Figure 2 The utility model is a structural schematic diagram of a high temperature resistant steam turbine blade guide roller.
[0019] Figure 3 The utility model is a cross-sectional view of a high temperature resistant steam turbine blade guide roller.
[0020] Figure 4 The utility model is a top view of a high temperature resistant steam turbine blade.
[0021] List of Figure Symbols:
[0022] 1 is the blade root, 2 is the blade ridge, 3 is the drainage hole, 4 is the auxiliary blade, 5 is the cover, 6 is the drainage blade roller, 7 is the output hole, 8 is the main blade, 9 is the bearing, 10 is the sealing ring, 11 is the roller blade, 13 is the dust ring, 14 is the guide protrusion, 15 is the guide shaft, 16 is the base, and 17 is the sleeve shaft. DETAILED DESCRIPTION
[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. It should be understood that the following specific implementations are only used to illustrate the present invention and are not used to limit the scope of the present invention.
[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a high temperature resistant steam turbine blade comprises a blade root; the top of the blade root 1 is integrally connected with a blade ridge 2, and the left and right sides of the blade ridge 2 are integrally connected with an auxiliary blade 4 and a main blade 8; the blade ridge 2 is provided with a plurality of groups of drainage holes 3 along the end surface of the main blade 8, and a drainage blade roller 6 is inserted into the blind hole provided in the center of the blade ridge 2, and the drainage channel of the drainage blade roller 6 is connected with the drainage hole 3; the auxiliary blade 4 and the main blade 8 are provided with two groups of output holes 7 along the blade body direction, and the output holes 7 are connected with the drainage channel of the drainage blade roller 6. Among them, the main blade 8 is the blade structure with the highest airflow contact surface, and the drainage hole 3 introduces the contacted airflow along the hole into the drainage channel at the center of the blade ridge 2, and the drainage blade roller 6 inside the drainage channel can rotate in coordination with the airflow pushing, and in the process of rotation, cooperates with the roller blade 11 of the drainage blade roller 6 to complete the airflow direction conversion, and the converted airflow is discharged along the output hole 7. The external airflow is introduced into the interior of the blade to complete the heat exchange process, ensuring that the steam turbine blade can continue to cool down during the rotation process.
[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the top of the drainage blade roller 6 is sleeved with a bearing 9, and a cover 5 is fixedly installed on the top of the bearing 9, and the bottom end face of the cover 5 is sealed and docked with the top end face of the blade spine 2. Among them, the bearing 9 can cooperate with the drainage blade roller 6 to complete the self-rotation and reduce the loss. The cover 5 is a structure that encapsulates the blind hole opened in the center of the blade spine 2, which can protect the built-in drainage blade roller 6.
[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the guide blade roller 6 is composed of three groups of roller blades 11 and a group of sleeve shafts 17. The outer ring of the sleeve shaft 17 is integrally provided with three groups of roller blades 11, and the three groups of roller blades 11 are evenly distributed. The roller blades 11 are blade structures that cooperate with air flow transportation. The sleeve shaft 17 serves as a central axis of rotation.
[0027] The bottom of the guide blade roller 6 is fixedly mounted with a guide protrusion 14, and the guide protrusion 14 is guided and docked with the base 16. The upper end surface of the base 16 is a groove structure, and the groove structure is complementary to the structure of the guide protrusion 14. The outer ring of the root of the guide protrusion 14 is fixedly connected with a dustproof ring 13, and the dustproof ring 13 is sealed at the top opening of the base 16. The guide protrusion 14 cooperates with the guide docking of the base 16 to stabilize the rotation center and reduce the rotation friction.
[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a guide shaft 15 is vertically installed at the center of the base 16, and the guide shaft 15 is vertically inserted into the shaft hole of the sleeve shaft 17. The guide shaft 15 is inserted into the guide structure in the sleeve shaft 17, which can improve the structural strength.
[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a sealing ring 10 is installed at the junction of the guide blade roller 6 and the bearing 9. The sealing ring 10 can prevent impurities from entering the interior.
[0030] It should be noted that the above content only illustrates the technical idea of the utility model and cannot be used to limit the protection scope of the utility model. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications all fall within the protection scope of the claims of the utility model.
Claims
1. A high temperature resistant steam turbine blade, comprising a blade root; wherein: The top of the blade root (1) is integrally connected to a blade ridge (2), and the left and right sides of the blade ridge (2) are integrally connected to auxiliary blades (4) and main blades (8); The blade spine (2) is provided with a plurality of groups of drainage holes (3) along the end surface of the main blade (8); a drainage blade roller (6) is inserted into a blind hole provided at the center of the blade spine (2); and a drainage channel of the drainage blade roller (6) is connected to the drainage hole (3); The auxiliary blade (4) and the main blade (8) are provided with two groups of output holes (7) along the blade body direction, and the output holes (7) are connected to the drainage channel of the drainage blade roller (6).
2. The high temperature resistant steam turbine blade according to claim 1, characterized in that: A bearing (9) is sleeved on the top of the guide blade roller (6), a cover (5) is fixedly mounted on the top of the bearing (9), and the bottom end surface of the cover (5) is sealed and butted with the top end surface of the blade spine (2).
3. The high temperature resistant steam turbine blade according to claim 1, characterized in that: The guide blade roller (6) comprises three groups of roller blades (11) and a group of sleeve shafts (17); the outer ring of the sleeve shaft (17) is integrally provided with the three groups of roller blades (11); the three groups of roller blades (11) are in a uniformly distributed structure; A guide protrusion (14) is fixedly mounted on the bottom of the guide blade roller (6), and the guide protrusion (14) is guided and docked with the base (16).
4. The high temperature resistant steam turbine blade according to claim 3, characterized in that: A guide shaft (15) is vertically mounted at the center of the base (16), and the guide shaft (15) is vertically inserted into the shaft hole of the sleeve shaft (17).
5. The high temperature resistant steam turbine blade according to claim 4, characterized in that: The upper end surface of the base (16) is in the form of a groove structure, the groove structure being complementary to the structure of the guide protrusion (14), the outer ring at the root of the guide protrusion (14) being fixedly connected to a dustproof ring (13), the dustproof ring (13) sealing the top opening of the base (16).
6. The high temperature resistant steam turbine blade according to claim 1, characterized in that: A sealing ring (10) is installed at the junction of the guide blade roller (6) and the bearing (9).