High-strength lightweight steam turbine blade

Abstract

The utility model relates to turbine manufacturing technical field especially a kind of high-strength light-weight turbine blade, including the blade root, blade body and blade cap connected in turn, the sequential quantity ratio of three is:1:2:1, arc line is provided with straining connecting bridge between every two adjacent blade body;The inside of blade root and blade body is provided with inner weight-reducing cavity, the outside of blade root is provided with outer weight-reducing cavity;Honeycomb filling frame is provided in the inner weight-reducing cavity, the outer weight-reducing cavity is connected with "Z" continuous support frame;The outside of one end of blade root and blade body is provided with arc-shaped clamping slot, the arc-shaped curve of arc-shaped clamping slot and the arc-shaped curve of straining connecting bridge are both common center;The utility model can effectively enhance the overall strength and rigidity of blade, improve the stability of blade under complex stress condition, reduce the risk of blade deformation and fracture;Realize to turbine blade two blade body is a group of synchronous installation, improve installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine manufacturing technology, and in particular to a high-strength, lightweight steam turbine blade. Background Technology

[0002] Steam turbines, as rotating power machines that convert the energy of steam into mechanical work, are widely used in power generation, industrial drives, and other fields. The design and manufacturing level of steam turbine blades is one of the most crucial factors restricting the performance of steam turbine units, directly affecting the turbine's efficiency, reliability, and service life. During turbine operation, the blades are subjected to enormous centrifugal forces and steam impact forces while rotating at high speeds, thus requiring extremely high strength and durability.

[0003] If turbine blades are heavy, it will increase the rotational inertia of the turbine rotor, leading to increased energy consumption during turbine startup and regulation. Furthermore, the greater centrifugal force will place a significant load on components such as the rotor and bearings, affecting the turbine's stability and reliability. While some lightweight blade designs reduce weight, they often lack strength and fatigue resistance, making long-term stable operation under complex conditions difficult. Therefore, achieving lightweight turbine blades while maintaining high strength can significantly improve their performance. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength, lightweight turbine blade that, while ensuring sufficient strength to withstand the mechanical forces under complex operating conditions, effectively reduces blade weight, improves turbine operating efficiency and reliability, and reduces energy consumption and maintenance costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A high-strength, lightweight steam turbine blade includes a blade root, a blade body, and a blade crown connected in sequence, with the ratio of the number of the three components being 1:2:1. An arc-shaped bracing bridge is provided between each pair of adjacent blade bodies.

[0007] Both the leaf root and the leaf body are provided with an inner weight-reducing cavity, and the leaf root is provided with an outer weight-reducing cavity.

[0008] The inner weight-reducing cavity is equipped with a honeycomb filling frame, and the outer weight-reducing cavity is connected to a "Z"-shaped continuous support frame.

[0009] Furthermore, an arc-shaped groove is provided on the outer side of the end where the leaf root connects to the leaf body. The arc-shaped curve of the arc-shaped groove and the arc-shaped curve of the supporting bridge share the same center. The cross-section of the arc-shaped groove is "["-shaped or "E"-shaped.

[0010] Furthermore, a fir-shaped insertion protrusion is provided at the end of the leaf root away from the leaf body.

[0011] Furthermore, the individual volume of the honeycomb filler frame within the leaf root is larger than the individual volume of the honeycomb filler frame within the leaf body.

[0012] Furthermore, the outer weight-reducing cavity is provided with an opening that connects to the outside, and the "Z"-shaped continuous support fully covers the area of ​​the opening.

[0013] Furthermore, the number of the bracing bridges is ≥1, and when the number exceeds 1, the spacing between any two adjacent bridges is 100mm to 300mm.

[0014] Furthermore, the internal structure of the braced bridge is solid.

[0015] Furthermore, the outer surfaces of the blade, blade crown, and supporting bridge are provided with an integrally connected shot peening reinforcement layer.

[0016] The beneficial effects of adopting the technical solution of this utility model are as follows:

[0017] 1. The arc-shaped bracing bridges set between adjacent blades in this utility model can effectively enhance the overall strength and rigidity of the blades, improve the stability of the blades under complex stress conditions, and reduce the risk of blade deformation and breakage; it enables the synchronous installation of two blades of the turbine blade as a set, improves installation efficiency, and reduces installation time and cost.

[0018] 2. The internal weight-reducing cavity and honeycomb filling frame set inside the blade root and blade body achieve lightweight design while ensuring blade strength; the individual volume of the honeycomb filling frame inside the blade root is larger than that inside the blade body, which can reasonably distribute the density according to the stress conditions of different parts, and further optimize the weight and strength distribution of the blade.

[0019] 3. The outer weight-reducing cavity outside the blade root is connected to a "Z"-shaped continuous support. The "Z"-shaped continuous support fully covers the opening range of the outer weight-reducing cavity, which reduces the weight of the blade while ensuring the structural strength and stability of the blade root.

[0020] 4. The shot peening reinforcement layer on the outer surface of the blade, blade crown and supporting bridge is strengthened by high-speed shot blasting, which significantly improves the fatigue resistance and wear resistance of the blade and extends the service life of the blade. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0026] Figure 5 This is a side view of the present invention.

[0027] The markings in the diagram are: 1. Leaf root; 1a. Arc-shaped groove; 1b. Fir-shaped insertion protrusion; 2. Leaf blade; 3. Leaf crown; 4. Supporting bridge; 5. Honeycomb filling frame; 6. "Z"-shaped continuous support frame. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] like Figures 1-5 As shown in the summary, a high-strength lightweight steam turbine blade includes a blade root 1, a blade body 2, and a blade crown 3 connected in sequence, with the ratio of the number of the three components being 1:2:1. Through the above design, the two blade bodies 2 of the steam turbine blade can be installed simultaneously as a group, improving installation efficiency and reducing installation time and cost.

[0030] During the start-up, shutdown, and load shedding processes of a steam turbine unit, the stress conditions at the blade root 1 are complex, making it prone to harmful defects that can ultimately lead to blade breakage at the blade root 1 and force the unit to shut down. Specifically, to improve the strength of the steam turbine blades, arc-shaped bracing bridges 4 are installed between adjacent blade sections 2. This enhances the stability of the blades under complex stress conditions and reduces the risk of blade deformation and breakage. The number of solid bracing bridges 4 is at least one. When the number exceeds one, the spacing between adjacent bridges is 100mm to 300mm, ensuring strength while rationally distributing the supporting force.

[0031] To achieve lightweight design, both the blade root 1 and the blade body 2 are equipped with internal weight-reducing cavities. A honeycomb filling frame 5 is installed within each internal weight-reducing cavity. The volume of a single honeycomb filling frame 5 within the blade root 1 is larger than that within the blade body 2, allowing for reasonable material distribution based on the stress conditions of different parts, further optimizing the weight and strength distribution of the blade. An external weight-reducing cavity is provided outside the blade root 1, connected to a "Z"-shaped continuous support frame 6. The external weight-reducing cavity has an opening connecting to the outside, and the "Z"-shaped continuous support frame 6 fully covers this opening, reducing the blade weight while ensuring the structural strength and stability of the blade root 1.

[0032] Meanwhile, an arc-shaped groove 1a is provided on the outer side of the end where the blade root 1 is connected to the blade body 2. The arc curve of the arc-shaped groove 1a and the arc curve of the supporting bridge 4 are concentric. The cross-section of the arc-shaped groove 1a is "[" or "E" shaped and the opening faces outward. This design has the function of strengthening the side edge of the blade.

[0033] In addition, a fir-shaped insertion protrusion 1b is provided at the end of the blade root 1 away from the blade body 2. The fir-shaped insertion protrusion 1b has many advantages, such as strong load-bearing capacity and uniform stress distribution, which can ensure reliable connection between the blade and the impeller and improve the stability of the blade during high-speed rotation.

[0034] A further optimization involves applying an integrally connected shot peening strengthening layer to the outer surfaces of the blade body 2, blade crown 3, and supporting bridge 4. Shot peening is a technique that strengthens metal surfaces by high-speed shot blasting. Applying shot peening to turbine blades can significantly improve their fatigue resistance and wear resistance, thereby extending their service life. Furthermore, shot peening can also improve the surface roughness of the blades, reduce fluid resistance, and increase the operating efficiency of the turbine.

[0035] This utility model relates to a high-strength, lightweight steam turbine blade, composed of a blade root 1, a blade body 2, and a blade crown 3 connected sequentially in a ratio of 1:2:1, with the blade root 1 having a one-to-two relationship with the blade body 2. During installation, two blade bodies are installed simultaneously as a group, effectively improving installation efficiency. The volume of a single honeycomb filler frame 5 within the blade root 1 is designed based on the stress conditions and dimensions of the blade root 1. For example, if the blade root 1 is large, the volume of a single honeycomb filler frame 5 can be designed to be 30 cm³, while the volume of a single honeycomb filler frame 5 within the blade body 2 is relatively smaller, such as 10 cm³, to achieve a reasonable weight and strength distribution. The tooth angle, tooth pitch, and other parameters of the fir-tree-shaped insertion protrusion 1b are designed according to the dimensions and stress requirements of the impeller mounting groove, ensuring a tight fit with the impeller mounting groove and withstanding the centrifugal force during high-speed rotation of the blade. The shot peening process parameters are determined based on the blade material and surface requirements. For example, the shot peening speed is 50 m / s and the peening time is 20 min, so as to form a uniform and dense shot peening reinforcement layer on the blade surface and ensure the production of high-strength turbine blades.

[0036] In this embodiment, through the above specific implementation methods, high-strength lightweight steam turbine blades can achieve beneficial effects such as improving installation efficiency, enhancing strength, reducing weight, and extending service life, thus meeting the actual needs of steam turbine operation.

[0037] The above embodiments based on this utility model are provided for guidance. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. Any modifications, equivalent substitutions, improvements, etc., within the spirit and principles of this invention should be included within the protection scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-strength lightweight steam turbine blade, comprising a blade root (1), a blade body (2) and a blade crown (3) connected in sequence, wherein the ratio of the number of the three components is 1:2:1, and an arc-shaped bracing bridge (4) is provided between adjacent blade bodies (2). Both the leaf root (1) and the leaf body (2) are provided with an inner weight-reducing cavity, and the leaf root (1) is provided with an outer weight-reducing cavity. The inner weight-reducing cavity is provided with a honeycomb filling frame (5), and the outer weight-reducing cavity is connected with a "Z"-shaped continuous support frame (6).

2. The high-strength lightweight steam turbine blade according to claim 1, characterized in that: An arc-shaped groove (1a) is provided on the outer side of the end where the leaf root (1) is connected to the leaf body (2). The arc curve of the arc-shaped groove (1a) and the arc curve of the bracing bridge (4) are concentric. The cross-section of the arc-shaped groove (1a) is "[" or "E".

3. The high-strength lightweight steam turbine blade according to claim 2, characterized in that: The leaf root (1) is provided with a fir-shaped insertion protrusion (1b) at the end away from the leaf body (2).

4. The high-strength lightweight steam turbine blade according to claim 1, characterized in that: The volume of a single honeycomb filling frame (5) in the leaf root (1) is larger than the volume of a single honeycomb filling frame (5) in the leaf body (2).

5. A high-strength, lightweight steam turbine blade according to claim 1, characterized in that: The external weight-reducing cavity is provided with an opening that connects to the outside, and the "Z"-shaped continuous support (6) fully covers the area of ​​the opening.

6. A high-strength, lightweight steam turbine blade according to claim 2, characterized in that: The number of the bracing bridges (4) is ≥1. When the number of them exceeds 1, the distance between any two adjacent bridges is 100mm to 300mm.

7. A high-strength, lightweight steam turbine blade according to claim 6, characterized in that: The internal structure of the bracing bridge (4) is solid.

8. A high-strength, lightweight steam turbine blade according to claim 7, characterized in that: The outer surfaces of the blade (2), the crown (3), and the supporting bridge (4) are provided with an integrally connected shot peening reinforcement layer.

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