Anti-erosion high-reliability regulating stage blade of steam turbine

Abstract

The utility model relates to the technical field of turbine blades, and discloses an anti-erosion high-reliability regulating stage blade of a turbine, which comprises a blade shaft, seven blade fixing seats are rotatably connected to the outside of the blade shaft, fan blades are detachably connected to the inside of a fixing and supporting mechanism, and the fan blades are fixedly connected to the blade shaft. Rotating shafts are fixedly connected to the bottoms of the close sides of the seven blade fixing seats, the blade adjusting mechanism comprises an adjusting block, a second connecting shaft is rotatably connected to the interior of an adjusting supporting assembly, a second annular shaft is fixedly connected to the top of the second connecting shaft, and a fixing frame is rotatably connected to the side, close to the supporting block, of the second annular shaft. According to the fan blade adjusting device, the position of the adjusting block can be adjusted, the first connecting shaft fixedly connected to the outer portion of the adjusting block drives the first annular shaft to move, then the first annular shaft drives the supporting shaft, and when the second connecting shaft moves, the second connecting shaft drives the fixing frame to push the rotating shaft to rotate, and therefore fan blade adjusting is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine blades, in particular to a steam turbine erosion-resistant and high-reliability regulating stage blade. Background Art

[0002] A steam turbine is a device that converts thermal energy into mechanical energy and is widely used in power generation and industry. The basic principle is that the high temperature and high pressure of steam or gas causes it to rotate blades, thereby driving the rotor to generate mechanical energy. Blades play a vital role in steam turbines because they convert the kinetic energy of the fluid into mechanical energy through interaction with the steam or gas flow. Without blades, the fluid cannot effectively propel the rotor, and the steam turbine cannot achieve energy conversion and mechanical motion. Therefore, the design and material of the blades are key factors in the efficiency and performance of steam turbines.

[0003] The working principle of steam turbine blades is to use the high-speed flow of steam on the surface of the blades to convert the kinetic energy and pressure energy of the steam into mechanical energy of the blades, thereby driving the turbine to rotate. When the steam enters the turbine, it is jetted toward the blades at high speed. The design of the blades makes the direction of the steam flow form a certain angle with the blade surface, thereby forming a torque that drives the blades to rotate. The rotation of the blades drives the shaft to rotate, and the mechanical energy output of the shaft drives the generator or other mechanical equipment to work. As the steam expands, the pressure gradually decreases and the flow rate increases. The blades gradually convert the energy of the steam into rotational kinetic energy;

[0004] Some existing steam turbine blades still use traditional fixed blade designs. However, these traditional fixed blade designs lack the flexibility to adjust their angles according to changing operating conditions, making it impossible to optimize steam flow direction and speed under varying loads and operating conditions, resulting in low energy conversion efficiency. Furthermore, this lack of blade adjustability makes it difficult for the turbine to maintain optimal performance during transient load fluctuations, startups, and shutdowns, impacting overall operational efficiency and reliability. To address these issues, a steam turbine erosion-resistant, high-reliability regulating stage blade was proposed. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a high-reliability erosion-resistant regulating stage blade for a steam turbine, aiming to improve the problem in the prior art that some existing steam turbine blades are installed in a fixed blade manner, resulting in the blades being unable to adapt to different loads and unable to optimize the steam flow direction and speed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a steam turbine erosion-resistant and high-reliability regulating stage blade, comprising a blade shaft, the outer portion of the blade shaft is rotatably connected to seven blade fixing seats, the outer walls of the blade fixing seats are each installed with a fixed support mechanism, the interior of the fixed support mechanism is detachably connected to a fan blade, the bottoms of the seven blade fixing seats on one side are each fixedly connected to a rotating shaft, the bottom of the rotating shaft is fixedly connected to a support block, the outer wall of the rotating shaft is fixedly connected to a blade adjusting mechanism, and the interior of the support block is fixedly connected to a central stabilizing shaft.

[0007] The blade adjustment mechanism includes an adjustment block, which is slidably connected to the outer wall of the central stabilizing shaft. The adjustment block is a seven-pointed star-shaped object. Seven adjustment support assemblies are fixedly connected to the outer wall of the adjustment block. The interior of the adjustment support assembly is rotatably connected to a second connecting shaft. The top of the second connecting shaft is fixedly connected to a second annular shaft. The side of the second annular shaft close to the support block is rotatably connected to a fixing bracket. The fixing bracket is detachably connected to the outside of the rotating shaft.

[0008] As a further description of the above technical solution: the fixed support mechanism includes two support frames, both of which are detachably connected to the outside of the blade fixing seat, the two support frames are L-shaped blocks, the two support frames stand opposite to each other, and the adjacent sides of the two support frames are fixedly connected to the outside of the fan blade, the outside of the support frame is detachably connected with four fixing screws, the four fixing screws are divided into two groups, two fixing screws are connected to the blade shaft, and two fixing screws are connected to the fan blade, the outside of the support frame is fixedly connected with a stabilizing block, and the two ends of the stabilizing block are respectively fixedly connected to the two ends of the L-shape of the support frame;

[0009] As a further description of the above technical solution: the adjustment support assembly includes seven connecting shafts 1, the seven connecting shafts 1 being fixedly connected to the outside of the adjustment block, the seven connecting shafts 1 being fixedly connected to the seven corners of the adjustment block respectively, the outer walls of the seven connecting shafts 1 being fixedly connected to an annular shaft 1, the outer upper side of the annular shaft 1 being fixedly connected to a support shaft, the top of the support shaft being rotatably connected to a rotating block, and the connecting shaft 2 being rotatably connected to the inside of the rotating block;

[0010] As a further description of the above technical solution: the fan blade includes two anti-erosion layers, two alloy steel layers, two sealing blocks, and four reinforcing ribs, wherein the alloy steel layer is fixedly connected to the adjacent sides of the two anti-erosion layers, the two sealing blocks are fixedly connected to the adjacent sides of the two alloy steel layers, the two sealing blocks are opposite to each other, and the four reinforcing ribs are fixedly connected between the two sealing blocks;

[0011] As a further description of the above technical solution: the outside of the connecting shaft 2 is fixedly connected with four limiting nuts, and the four limiting nuts are fixedly connected to the outside of the connecting shaft 2 in sections;

[0012] As a further description of the above technical solution: the top of the blade shaft is conical, the top of the central stabilizing shaft is conical, and the blade shaft and the central stabilizing shaft are in contact with each other;

[0013] As a further description of the above technical solution: the rotating block is a trapezoidal block, the side of the rotating block close to the second connecting shaft is in an I-shape, and the second connecting shaft is fixedly connected to the two horizontal ends of the I-shape;

[0014] As a further description of the above technical solution: the support block is a heptagon, and the seven rotation shafts are fixedly connected to each side of the support block.

[0015] The utility model has the following beneficial effects:

[0016] 1. In the present invention, by adjusting the position of the adjusting block, the connecting shaft 1 fixedly connected to the outside of the adjusting block drives the annular shaft 1 to move, and then the annular shaft 1 drives the supporting shaft, and finally drives the connecting shaft 2 to move. When the connecting shaft 2 moves, because the other end of the connecting shaft 2 is fixedly connected to the outer wall of the rotating shaft through the fixing frame, the rotating shaft rotates, thereby completing the adjustment of the fan blades, reducing the wear and fatigue of the blades, extending their service life, and ultimately reducing maintenance costs and improving the economy of the system.

[0017] 2. In the present invention, when the staff installs the fan blades to the outer wall of the blade fixing seat, the support frame is fixedly connected to the outer wall of the blade fixing seat by fixing screws. At the same time, the support frame is connected to the outside of the fan blades by fixing screws to fix and support the fan blades. At the same time, the stabilizing block fixedly connected to the outer wall of the support frame provides stable support for the rotation of the fan blades to prevent breakage or deformation due to blade resonance problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional schematic diagram of a steam turbine erosion-resistant and high-reliability regulating stage blade proposed by the utility model;

[0019] Figure 2 This is a structural schematic diagram of a central stabilizing shaft for a steam turbine erosion-resistant and high-reliability regulating stage blade proposed by the utility model;

[0020] Figure 3 This is a schematic structural diagram of a rotating shaft of a steam turbine erosion-resistant and high-reliability regulating stage blade proposed by the utility model;

[0021] Figure 4This is a schematic structural diagram of a reinforcing rib for a steam turbine erosion-resistant and high-reliability regulating stage blade proposed by the utility model.

[0022] Legend:

[0023] 1. Blade shaft; 2. Blade fixing seat; 3. Fan blade; 4. Center stabilizing shaft; 5. Adjustment block; 6. Annular shaft 1; 7. Connecting shaft 1; 8. Support shaft; 9. Rotating block; 10. Connecting shaft 2; 11. Limit nut; 12. Annular shaft 2; 13. Fixing frame; 14. Rotating shaft; 15. Support block; 16. Support frame; 17. Stabilizing block; 18. Fixing screw; 19. Anti-erosion layer; 20. Alloy steel layer; 21. Sealing block; 22. Reinforcement rib. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Reference Figure 2 、 Figure 3The utility model provides an embodiment: a high-reliability, erosion-resistant regulating stage blade for a steam turbine, comprising a blade shaft 1. The blade shaft 1 is the core component of the entire blade system, carrying fan blades 3, a blade adjustment mechanism, and a blade fixing seat 2. At the same time, the conical design of the top minimizes the impact of the gas on the entire blade system and reduces the damage to the blade system caused by high-speed, high-pressure gas. The outer rotation of the blade shaft 1 is connected to seven blade fixing seats 2. The blade fixing seats 2 are key components for connecting and supporting the blades. A fixed support mechanism is installed on the outer wall of the blade fixing seat 2 to provide stable support. Each blade fixing seat 2 is connected to the blade shaft 1 and can rotate freely, allowing the blade to adjust its angle as needed in the steam turbine. The outer wall of the blade fixing seat 2 is installed with a fixed support mechanism. The function of the fixed support mechanism is to ensure the stability of the blade and the blade fixing seat 2. The interior of the fixed support mechanism is detachably connected to the fan blade 3. The fan blade 3 is a key component directly affected by the airflow. The fan blade 3 has erosion resistance and high temperature resistance, ensuring the high reliability of the fan blade 3 during long-term operation. The interior of the fan blade 3 includes multiple layers: an anti-erosion layer 19, an alloy steel layer 20, a sealing block 21 and a reinforcing rib 22, which can effectively resist impurities, cavitation and other wear in the airflow. The bottom of the seven blade fixing seats 2 on the adjacent side are fixedly connected with a rotating shaft 14. The rotating shaft 14 rotates due to the rotational force transmitted by the blade adjustment mechanism, and at the same time transmits the rotational force to the blade fixing seat 2, causing the blade fixing seat 2 to rotate, and finally completing the angle adjustment of the fan blade 3. The bottom of the rotating shaft 14 is rotatably connected to the support block 15, which is used to provide stable support so that the rotating shaft 14 and the entire blade adjustment mechanism can work normally. The heptagonal design of the support block 15 can connect seven fan blades 3 and seven blade adjustment mechanisms, thereby improving the stability of the device during operation. The outer wall of the rotating shaft 14 is fixedly connected to the blade adjustment mechanism to adjust the angle of the fan blade 3 and thus control the aerodynamic performance of the blade. The interior of the support block 15 is fixedly connected to the central stabilizing shaft 4 to ensure the stability of the support block 15 and the adjustment block 5 during operation, specifically ensuring the stability of the support block 15 during the rotation of the fan blade 3 and the stability of the adjustment block 5 during the adjustment of the angle of the fan blade 3.

[0026] The blade adjustment mechanism includes an adjustment block 5, which completes the angle adjustment of the fan blade 3 by sliding up and down with the cooperation of the adjustment support assembly, the connecting shaft 2 10, the annular shaft 2 12, and the fixing frame 13. The adjustment block 5 is slidably connected to the outer wall of the central stabilizing shaft 4. The adjustment block 5 is a seven-pointed star-shaped object. The outer wall of the adjustment block 5 is fixedly connected with seven adjustment support assemblies. The seven-pointed star design of the adjustment block 5 allows the adjustment block 5 to accommodate up to seven blade adjustment mechanisms, corresponding to the seven fan blades 3. The internal rotation of the adjustment support assembly is connected to the connecting shaft 2 10. The connecting shaft 2 10 is connected to the inside of the rotating block 9 by rotation. As a connecting piece, it cooperates with the annular shaft 2 12 to connect the rotating block 9 to the fixing frame 13. When the rotating block 9 is displaced, the angle of the fixing frame 13 can be adjusted according to the displacement direction and angle, so that the fixing frame 13 can rotate with the rotating shaft 14. The top of the connecting shaft 2 10 is fixedly connected with the annular shaft 2 12. The rotation connection of the annular shaft 2 12 enhances the flexibility and precision of the adjustment process, and can withstand the adjustment time. The torque generated, the annular shaft 2 12 is rotatably connected to the side close to the support block 15 with a fixed frame 13, and the fixed frame 13 is connected to the rotating shaft 14, as a force transmission part, which converts the force transmitted by the blade adjustment mechanism to promote the rotation of the rotating shaft 14 to complete the angle adjustment of the fan blade 3, and the fixed frame 13 is detachably connected to the outside of the rotating shaft 14. The adjustment support assembly includes seven connecting shafts 7, and the seven connecting shafts 7 are fixedly connected to the outside of the adjustment block 5. The seven connecting shafts 7 are respectively fixedly connected to the seven corners of the adjustment block 5. The outer walls of the seven connecting shafts 7 are fixedly connected to annular shafts 6. The connecting shaft 7 is responsible for connecting the various corners of the adjustment block 5 with the adjustment support assembly, and the annular shaft 6 plays a role of support and adjustment to ensure that each component remains stable during the adjustment process. The outer upper side of the annular shaft 6 is fixedly connected to the support shaft 8, as a connecting part, to ensure the connection between the annular shaft 6 and the rotating block 9. The top of the support shaft 8 is rotatably connected to the rotating block 9. The rotating block 9 is a trapezoidal block, and the connecting shaft 2 10 is adjusted through it. The trapezoidal design of the rotating block 9 provides better mechanical stability. The connecting shaft 2 10 is rotatably connected to the inside of the rotating block 9. The top of the blade shaft 1 is conical, and the top of the central stabilizing shaft 4 is conical. The blade shaft 1 and the central stabilizing shaft 4 fit together. The support block 15 is a heptagon, and seven rotating shafts 14 are fixedly connected to each side of the support block 15.

[0027] Reference Figure 1 、 Figure 4The fixed support mechanism includes two support frames 16, which are connected to the blade fixing seat 2 and the fan blade 3 through detachable screws to maintain the fastening and supporting function of the overall structure. The two support frames 16 can be detachably connected to the outside of the blade fixing seat 2. The two support frames 16 are L-shaped blocks. The L-shaped design enables the support frame 16 to provide more supporting force, thereby improving the stability of the blade system. The two support frames 16 stand opposite to each other, and the two support frames 16 are fixedly connected to the outside of the fan blade 3 on one side. The outside of the support frame 16 is detachably connected with four fixing screws 18, and the detachable connection is achieved through threaded coupling, so that the fan blade 3 and the support frame 16 can be replaced and repaired. The four fixing screws 18 are divided into two groups, two fixing screws 18 are connected to the blade shaft 1, and two fixing screws 18 are connected to the fan blade 3. The outside of the support frame 16 is fixedly connected with a stabilizing block 17. The stabilizing block serves as the main object for bearing the resonance transmitted from the fan blade 3. It cooperates with the support frame 16 to form a stable triangular structure, which can absorb stronger resonance force. The two ends of the stabilizing block 17 are respectively fixedly connected to the two ends of the L-shape of the support frame 16. The fan blade 3 includes two anti-erosion layers 19, two alloy steel layers 20, two sealing blocks 21, and four reinforcing ribs 22. The anti-erosion layer 19 uses anti-erosion material, which can effectively reduce The damage to the blade surface caused by dust and water droplets in the airflow is extended, and the alloy steel layer 20 provides good strength and high temperature resistance, so that the blade device can be used in high temperature and high pressure working environments. The two sealing blocks 21 cooperate with the alloy steel layer 20 to form a cavity to accommodate the reinforcing ribs 22. The reinforcing ribs 22 provide additional structural strength and reduce deformation and damage to the blade. The alloy steel layer 20 is fixedly connected to the side close to the two anti-erosion layers 19. The two sealing blocks 21 are fixedly connected to the side close to the two alloy steel layers 20. The two sealing blocks 21 stand opposite each other. Four reinforcing ribs 22 are fixedly connected between the two sealing blocks 21. Four limit nuts 11 are fixedly connected to the outside of the connecting shaft 2 10 to limit the range of movement of the connecting shaft 2 10 and prevent the connecting shaft 2 10 from causing damage to the device due to special circumstances. The four limit nuts 11 are fixedly connected to the outside of the connecting shaft 2 10 in sections. The rotating block 9 is a trapezoidal block. The side of the rotating block 9 close to the connecting shaft 2 10 is in an I-shape, and the connecting shaft 2 10 is fixedly connected to the two horizontal ends of the I-shape.

[0028] Working principle: When the staff installs the fan blade 3 to the outer wall of the blade fixing seat 2, the support frame 16 is fixedly connected to the outer wall of the blade fixing seat 2 through the fixing screws 18. At the same time, the support frame 16 is connected to the outside of the fan blade 3 through the fixing screws 18 to fix and support the fan blade 3. At the same time, the stabilizing block 17 fixedly connected to the outer wall of the support frame 16 provides stable support for the rotation of the fan blade 3;

[0029] When the angle of the fan blade 3 needs to be adjusted, the position of the adjustment block 5 can be adjusted, and the connecting shaft 17 fixedly connected to the outside of the adjustment block 5 drives the annular shaft 16 to move, and then the annular shaft 16 drives the support shaft 8. The movement of the support shaft 8 causes the angle rotation and position movement of the rotating block 9, and then because the angle of the rotating block 9 is good for drilling holes and the position movement, the connecting shaft 2 10 and the annular shaft 2 12 are driven to move. Finally, the angle adjustment of the rotating shaft 14 is completed by the fixing frame 13 fixedly connected to the outer wall of the rotating shaft 14, thereby completing the adjustment of the fan blade 3. At the same time, for the device, the fan blade 3 is composed of multiple hierarchical structures, including an anti-erosion layer 19, an alloy steel layer 20, a sealing block 21 and a reinforcing rib 22, which can effectively resist impurities, cavitation and other wear in the airflow, and ensure the high reliability of the blade during long-term operation.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steam turbine erosion-resistant and high-reliability regulating stage blade, comprising a blade shaft (1), characterized in that: The blade shaft (1) is rotatably connected to seven blade fixing seats (2) on the outside, and the outer walls of the blade fixing seats (2) are each installed with a fixed support mechanism, and the interior of the fixed support mechanism is detachably connected to a fan blade (3), and the bottoms of the seven blade fixing seats (2) on the adjacent side are each fixedly connected to a rotating shaft (14), and the bottom of the rotating shaft (14) is fixedly connected to a support block (15), and the outer wall of the rotating shaft (14) is fixedly connected to a blade adjustment mechanism, and the interior of the support block (15) is fixedly connected to a central stabilizing shaft (4); The blade adjustment mechanism includes an adjustment block (5), the adjustment block (5) is slidably connected to the outer wall of the central stabilizing shaft (4), the adjustment block (5) is a seven-pointed star-shaped block, the outer wall of the adjustment block (5) is fixedly connected to seven adjustment support assemblies, the interior of the adjustment support assembly is rotatably connected to a second connecting shaft (10), the top of the second connecting shaft (10) is fixedly connected to a second annular shaft (12), the side of the second annular shaft (12) close to the support block (15) is rotatably connected to a fixing frame (13), and the fixing frame (13) is detachably connected to the outside of the rotating shaft (14).

2. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 1, characterized in that: The fixed support mechanism includes two support frames (16), both of which are detachably connected to the outside of the blade fixing seat (2), the two support frames (16) are L-shaped blocks, the two support frames (16) stand opposite to each other, and the two support frames (16) are fixedly connected to the outside of the fan blade (3) on one side. The outside of the support frame (16) is detachably connected with four fixing screws (18), and the four fixing screws (18) are divided into two groups. Two of the fixing screws (18) are connected to the blade shaft (1), and two of the fixing screws (18) are connected to the fan blade (3). The outside of the support frame (16) is fixedly connected with a stabilizing block (17), and the two ends of the stabilizing block (17) are respectively fixedly connected to the two ends of the L shape of the support frame (16).

3. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 1, characterized in that: The adjustment support assembly includes seven connecting shafts (7), the seven connecting shafts (7) are fixedly connected to the outside of the adjustment block (5), the seven connecting shafts (7) are respectively fixedly connected to the seven corners of the adjustment block (5), the outer walls of the seven connecting shafts (7) are fixedly connected to the annular shaft (6), the outer upper side of the annular shaft (6) is fixedly connected to the support shaft (8), the top of the support shaft (8) is rotatably connected to the rotating block (9), and the connecting shaft (10) is rotatably connected to the inside of the rotating block (9).

4. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 1, characterized in that: The fan blade (3) includes two anti-erosion layers (19), two alloy steel layers (20), two sealing blocks (21), and four reinforcing ribs (22). The alloy steel layer (20) is fixedly connected to the adjacent side of the two anti-erosion layers (19), the two sealing blocks (21) are fixedly connected to the adjacent side of the two alloy steel layers (20), the two sealing blocks (21) stand opposite to each other, and the four reinforcing ribs (22) are fixedly connected between the two sealing blocks (21).

5. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 1, characterized in that: The outside of the second connecting shaft (10) is fixedly connected with four limiting nuts (11), and the four limiting nuts (11) are fixedly connected to the outside of the second connecting shaft (10) in sections.

6. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 1, characterized in that: The top of the blade shaft (1) is conical, the top of the central stabilizing shaft (4) is conical, and the blade shaft (1) and the central stabilizing shaft (4) are fitted together.

7. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 3, characterized in that: The rotating block (9) is a trapezoidal block. The side of the rotating block (9) close to the second connecting shaft (10) is in an I-shape. The second connecting shaft (10) is fixedly connected to the two horizontal ends of the I-shape.

8. The erosion-resistant and high-reliability regulating stage blade for a steam turbine according to claim 1, characterized in that: The support block (15) is a heptagon, and the seven rotating shafts (14) are fixedly connected to each side of the support block (15).

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