Steam turbine capable of mechanically locking angle of stationary blade

Abstract

The steam turbine comprises a steam turbine shaft system, a shaft system wheel disc, an air cylinder, a plurality of steam turbine stationary blades, an integrated angle adjusting rotating wheel, an angle adjusting translation magnetic plate, an angle adjusting driving mechanism and an angle locking mechanism. And the shafting wheel disc is arranged on the steam turbine shafting. And the steam turbine shaft system and the shaft system wheel disc are arranged in the cylinder. The multiple steam turbine stationary blades are arranged in the air cylinder, and the tops of the multiple steam turbine stationary blades extend out of the air cylinder. The integrated angle adjusting rotating wheel is arranged outside the air cylinder, and the interior of the integrated angle adjusting rotating wheel is correspondingly matched with the multiple steam turbine stationary blades. Therefore, according to the turbine capable of mechanically locking the angle of the stationary blade, pneumatic improvement and efficiency improvement of the turbine under the low-load deviation working condition are achieved, and angle deviation and vibration of the stationary blade of the turbine under strong impact of steam flow are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of energy and power station, and in particular to a steam turbine with mechanically locked stator blade angle. Background Art

[0002] In the field of energy and power plant technology, steam turbines are an important type of power equipment, and their performance directly affects the energy conversion efficiency and the economic efficiency of power plant operation. Traditional steam turbine stator blades are usually fixed in design, that is, the angle of the stator blades cannot be adjusted after installation. However, with the fluctuation of power demand and changes in load, steam turbines often need to operate under different operating conditions, especially at low load or deviating from the design conditions. The design of fixed stator blades may lead to a decrease in aerodynamic performance and efficiency, and may even cause the angle of the stator blades to deviate and vibrate under the strong impact of steam flow, affecting the safety and stability of the steam turbine.

[0003] In order to improve this problem, variable stator blade technology has emerged in recent years, which is to adjust the angle of the stator blades to adapt to different working conditions, thereby optimizing the aerodynamic performance and efficiency of the steam turbine. However, the existing variable stator blade technology usually has some problems, such as complex adjustment mechanism, low reliability, and difficulty in maintaining stability under strong impact of steam flow. These problems are particularly prominent in large-scale power station turbines that need to operate stably for a long time.

[0004] Therefore, there is an urgent need for a new type of mechanically locked stator blade angle steam turbine, which can not only improve aerodynamic performance and efficiency under low load or deviation from design conditions, but also avoid angle deviation and vibration of the stator blades under strong impact of steam flow, thereby ensuring the safety and stability of the steam turbine. Summary of the invention

[0005] The object of the present invention is to provide a steam turbine with mechanically locked stator blade angle, which realizes aerodynamic improvement and efficiency enhancement under low-load biased operating conditions of the steam turbine, and avoids angle deviation and vibration of the steam turbine stator blades under strong impact of steam flow.

[0006] To achieve the above-mentioned purpose, the present invention provides a mechanically locked stator blade angle steam turbine, comprising: a turbine shaft system, a shaft system wheel, a cylinder, a plurality of turbine stator blades, an integrated angle adjustment wheel, an angle adjustment translational magnetic plate, an angle adjustment drive mechanism, and an angle locking mechanism. The shaft system wheel is installed on the turbine shaft system. The turbine shaft system and the shaft system wheel are installed in the cylinder. The plurality of turbine stator blades are respectively arranged in the cylinder, and the tops of the plurality of turbine stator blades extend out of the cylinder. The integrated angle adjustment wheel is arranged outside the cylinder, and the interior of the integrated angle adjustment wheel is adapted to the plurality of turbine stator blades. The angle adjustment translational magnetic plate is arranged outside the integrated angle adjustment wheel, and the angle adjustment translational magnetic plate is used to adapt to the exterior of the integrated angle adjustment wheel, and a plurality of slots are respectively provided on the two side edges of the angle adjustment translational magnetic plate. The angle adjustment driving mechanism is in transmission connection with the angle adjustment translational magnetic plate, and the angle adjustment driving mechanism is used to drive the angle adjustment translational magnetic plate to translate horizontally to the left and right, thereby driving the integrated angle adjustment wheel to rotate in a small angle circle, thereby driving the multiple turbine stator blades to rotate from the first position to the second position. And the angle locking mechanism is arranged on the cylinder, and the angle locking mechanism is used to correspond to and adapt to the multiple slots of the angle adjustment translational magnetic plate.

[0007] In one embodiment of the present invention, the angle locking mechanism comprises: a body and two locking pins. The body is disposed on the cylinder; and the two locking pins are respectively disposed at two ends of the body, and the two locking pins are used to correspond to and adapt to the plurality of slots.

[0008] In one embodiment of the present invention, the mechanically locked stator blade angle steam turbine further comprises a connecting rod, and both ends of the connecting rod are respectively transmission-connected to the angle adjustment driving mechanism and the angle adjustment translational magnetic plate.

[0009] In one embodiment of the present invention, the angle adjustment translational magnetic plate has a translational magnetic strip on the outer side close to the integrated angle adjustment rotating wheel, and the translational magnetic strip is used to correspond to and adapt to the integrated angle adjustment rotating wheel.

[0010] In one embodiment of the present invention, an outer side of the integrated angle adjustment wheel has an external meshing magnetic wheel, and the external meshing magnetic wheel is used to correspond and adapt to the translational magnetic strip.

[0011] In one embodiment of the present invention, an inner side of the integrated angle adjustment wheel has an internal meshing magnetic wheel, and the internal meshing magnetic wheel is used to correspond to and adapt to the plurality of steam turbine stator blades.

[0012] In one embodiment of the present invention, the tops of the plurality of steam turbine stator blades are each provided with a stator blade rotating magnetic wheel, and the stator blade rotating magnetic wheel is used to correspond and adapt to the internal meshing magnetic wheel.

[0013] In one embodiment of the present invention, the angle adjustment drive mechanism is driven by hydraulic pressure or stepping motor.

[0014] In one embodiment of the present invention, the turbine shaft system and the shaft system wheel are integrally formed.

[0015] In one embodiment of the present invention, the steam turbine with mechanically locked stator blade angle further comprises a plurality of steam turbine moving blades respectively disposed in the cylinder, and the plurality of steam turbine moving blades and the plurality of steam turbine stator blades are arranged alternately.

[0016] Compared with the prior art, the steam turbine with mechanically locked stator blade angle according to the present invention has the following beneficial effects:

[0017] 1. The present invention adopts a variable stator blade design, so that the angle of the stator blade can be adjusted according to actual needs when the steam turbine is under low load or deviates from the design working condition, thereby optimizing the steam flow path, improving the aerodynamic performance, and improving the overall efficiency of the steam turbine. This flexibility helps to reduce energy waste and improve the operating economy of the power station;

[0018] 2. The integrated angle adjustment wheel design of the present invention can achieve synchronous angle adjustment of all stationary blades through one driving source. This design simplifies the adjustment mechanism, reduces the number of components, reduces maintenance costs, and improves system reliability;

[0019] 3. The present invention adopts non-contact magnetic drive technology, and realizes high-reliability adjustment of angles through the cooperation of the translational magnetic strip and the external meshing magnetic wheel. This design avoids contact mechanical wear, prolongs the service life of the equipment, and improves the accuracy and stability of adjustment.

[0020] 4. The angle locking mechanism of the present invention realizes mechanical locking of the angle of the stator blades by the cooperation of the locking pin and the slot. This design can effectively prevent the angle deviation and vibration of the turbine stator blades under the strong impact of the steam flow, thereby ensuring the safety and stability of the turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic cross-sectional structure diagram of a steam turbine with mechanically locked stator blade angle according to an embodiment of the present invention;

[0022] Figure 2 2 is a schematic diagram of a partial structure of a steam turbine with mechanically locked stator blade angle according to an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of an angle locking mechanism for a steam turbine with mechanically locked stator blade angles according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure principle of the stator blade angle adjustment of a steam turbine with mechanically locked stator blade angle according to an embodiment of the present invention.

[0025] Description of main reference numerals:

[0026] 1-steam turbine shaft system, 2-shaft system wheel, 3-cylinder, 4-integrated angle adjustment wheel, 41-external meshing magnetic wheel, 42-internal meshing magnetic wheel, 5-steam turbine stator blade, 51-second position, 52-top, 53-stator blade rotating magnetic wheel, 6-angle adjustment translational magnetic plate, 61-translational magnetic strip, 7-angle adjustment driving mechanism, 71-connecting rod, 8-angle locking mechanism, 81-locking pin. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0028] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0029] To facilitate understanding, the main implementation concepts of the embodiments of the present invention are first briefly described.

[0030] In the energy and power plant industries, steam turbines are core power equipment, and their performance has a direct impact on energy conversion efficiency and power plant operation economy. In traditional steam turbine designs, the angle of the stator blades is usually fixed, which means that once installed, the angle of the stator blades cannot be adjusted. This design performs well when the steam turbine is running at full load at rated power, because the aerodynamic performance has been optimized at this time.

[0031] However, with the ever-changing power demand and load fluctuations, steam turbines often need to operate under different operating conditions. Especially at low load or deviating from the design conditions, the design of fixed stators reveals its limitations. Since the speed, pressure and direction of steam flow will change with the load, the fixed stators cannot adapt to these changes, resulting in reduced aerodynamic performance and lower efficiency. This not only increases energy waste, but also reduces the operating economy of the power station.

[0032] More seriously, under the strong impact of steam flow, the fixed stator blades may also experience angular deviation and vibration. Such deviation and vibration will not only further reduce the efficiency of the steam turbine, but may also pose a threat to the safety and stability of the steam turbine. For example, the angular deviation of the stator blades may lead to uneven distribution of steam flow, which in turn causes vibration and noise of the steam turbine, and in severe cases may even cause equipment damage.

[0033] The inventors have discovered the above-mentioned defects in the prior art, and the present invention provides a steam turbine with mechanically locked stator blade angle. The steam turbine adopts a variable stator blade design, so that the angle of the stator blade can be adjusted according to actual needs under low load or deviated from the design working conditions, thereby optimizing the steam flow path, improving aerodynamic performance, and improving overall efficiency, and avoiding contact mechanical wear, extending the service life of the equipment, and can effectively prevent the stator blade 5 of the steam turbine from angular deviation and vibration under the strong impact of the steam flow.

[0034] Figure 1 is a schematic cross-sectional structure diagram of a steam turbine with mechanically locked stator blade angle according to an embodiment of the present invention; Figure 2 is a schematic diagram of a partial structure of a steam turbine with mechanically locked stator blade angle according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of an angle locking mechanism for a steam turbine with mechanically locked stator blade angles according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure principle of the stator blade angle adjustment of a steam turbine with mechanically locked stator blade angle according to an embodiment of the present invention.

[0035] like Figures 1 to 4As shown, a mechanically locked stator blade angle steam turbine according to a preferred embodiment of the present invention comprises: a turbine shaft system 1, a shaft system wheel 2, a cylinder 3, a plurality of turbine stator blades 5, an integrated angle adjustment wheel 4, an angle adjustment translation magnetic plate 6, an angle adjustment drive mechanism 7 and an angle locking mechanism 8. The shaft system wheel 2 is mounted on the turbine shaft system 1. The turbine shaft system 1 and the shaft system wheel 2 are mounted in the cylinder 3. The plurality of turbine stator blades 5 are respectively arranged in the cylinder 3, and the tops 52 of the plurality of turbine stator blades 5 extend out of the cylinder 3. The integrated angle adjustment wheel 4 is arranged outside the cylinder 3, and the interior of the integrated angle adjustment wheel 4 is adapted to the plurality of turbine stator blades 5. The angle adjustment translational magnetic plate 6 is arranged on the outside of the integrated angle adjustment wheel 4, and the angle adjustment translational magnetic plate 6 is used to correspond to the outside of the integrated angle adjustment wheel 4, and a plurality of slots are respectively provided on the two side edges of the angle adjustment translational magnetic plate 6. The angle adjustment driving mechanism 7 is transmission-connected with the angle adjustment translational magnetic plate 6, and the angle adjustment driving mechanism 7 is used to drive the angle adjustment translational magnetic plate 6 to translate horizontally to the left and right, thereby driving the integrated angle adjustment wheel 4 to make a small-angle circular rotation, and then driving the plurality of turbine stator blades 5 to rotate from the first position to the second position 51. And the angle locking mechanism 8 is arranged on the cylinder 3, and the angle locking mechanism 8 is used to correspond to the plurality of slots of the angle adjustment translational magnetic plate 6.

[0036] Specifically, the turbine shaft system 1 is the core support structure of the entire equipment, on which the shaft system wheel 2 is installed, and the two together constitute the basis of the rotating parts of the turbine. These parts are firmly installed inside the cylinder 3, providing a solid foundation for the stable operation of the turbine. A plurality of turbine stator blades 5 are arranged inside the cylinder 3, and the tops 52 of these stator blades extend out of the cylinder 3, providing guidance and acceleration for the flow of steam. In order to meet the needs under different working conditions, the present invention introduces variable stator blade technology. The integrated angle adjustment runner 4 is cleverly arranged outside the cylinder 3, and its internal structure corresponds to the plurality of turbine stator blades 5. This design allows the angle of the stator blade to be flexibly adjusted to adapt to different steam flow conditions. In order to achieve precise adjustment of the stator blade angle, the present invention adopts an angle adjustment translation magnetic plate 6. The magnetic plate is arranged outside the integrated angle adjustment runner 4 and corresponds to its external structure. A plurality of card slots are respectively provided on the two side edges of the magnetic plate, and these card slots cooperate with the angle locking mechanism 8 to achieve mechanical locking of the stator blade angle. The angle adjustment drive mechanism 7 is connected to the angle adjustment translation magnetic plate 6 by transmission, and drives the magnetic plate to translate horizontally to the left and right, driving the integrated angle adjustment wheel 4 to rotate in a small angle. This rotation, through magnetic coupling, drives multiple turbine stator blades 5 to rotate from the original first position to the optimized second position 51. The angle locking mechanism 8 is arranged on the cylinder 3 and is adapted to the slot of the angle adjustment translation magnetic plate 6. When the stator blade angle is adjusted to the desired position, the locking pin 81 of the locking mechanism will be inserted into the slot of the magnetic plate (for example, it can be realized by electric control, that is, the present invention can also include an electric control device, which is used to control the opening and closing of the angle locking mechanism 8, and control the locking pin 81 to insert or pull out of the slot), and the angle of the stator blade is completely locked to prevent displacement and vibration under the strong impact of the steam flow. This design not only improves the operating stability of the steam turbine, but also enhances its safety. In addition, the present invention also adopts non-contact magnetic drive technology. Highly reliable adjustment of the stationary blade angle is achieved through the cooperation of the translational magnetic strip 61 and the external meshing magnetic wheel 41. This non-contact design avoids the problems caused by traditional contact mechanical wear, prolongs the service life of the equipment, and improves the accuracy and stability of the adjustment.

[0037] Based on the above analysis, it can be seen that the mechanically locked stator blade angle steam turbine of the present invention, through ingenious structural design and innovative technical application, realizes the improvement of aerodynamic performance and efficiency of the steam turbine under low load or deviation from the design working conditions. At the same time, the steam turbine also has a high degree of safety and stability, which can effectively prevent the stator blades from angular deviation and vibration under the strong impact of steam flow, providing a strong guarantee for the economic operation and safe production of the power station.

[0038] In one embodiment of the present invention, the angle locking mechanism 8 comprises: a body and two locking pins 81. The body is disposed on the cylinder 3; and the two locking pins 81 are respectively disposed at two ends of the body, and the two locking pins 81 are used to correspond to and adapt to the multiple slots.

[0039] Specifically, the angle locking mechanism 8 includes a main body and two locking pins 81. The main body is firmly arranged on the cylinder 3 as a supporting structure of the entire locking mechanism. The two locking pins 81 are respectively installed at both ends of the main body. Their function is to correspond to and adapt to the multiple slots on the angle adjustment translation magnetic plate 6, so as to achieve mechanical locking of the stator blade angle. When the angle adjustment drive mechanism 7 drives the angle adjustment translation magnetic plate 6 to translate horizontally to the left and right, and then drives the integrated angle adjustment wheel 4 and the turbine stator blade 5 to rotate to the desired angle, the angle locking mechanism 8 plays its key role. At this time, the locking pin 81 will be accurately inserted into the slot on the edge of the magnetic plate, completely locking the movement of the magnetic plate, the integrated angle adjustment wheel 4 and the turbine stator 5 (for example, the present invention may also include a controller and a sensor. When the sensor detects that the angle of the turbine stator 5 has rotated to the second position 51, it will send a completion signal to the controller, and the controller can send an opening signal to the electronic control device, at which time the electronic control device controls the locking pin 81 to be inserted into the slot; similarly, when the turbine stator 5 needs to rotate again, the controller sends a closing signal to the electronic control device, at which time the electronic control device controls the locking pin 81 to be pulled out of the slot). This design ensures that the stator angle can remain stable after the adjustment is completed, and effectively prevents the turbine stator 5 from angular deviation and vibration under the strong impact of the steam flow. This design of the angle locking mechanism 8 not only improves the operating stability of the turbine, but also enhances its safety. In the actual operation of the power station, the turbine often needs to face various complex and changeable working conditions, including load fluctuations, changes in steam flow, etc. If the angle of the stator blade cannot remain stable after the adjustment is completed, it may cause the aerodynamic performance of the turbine to decline, and even cause equipment damage or safety accidents. The angle locking mechanism 8 in the present invention effectively solves this problem through its precise locking function, providing a strong guarantee for the safe operation of the power station. In addition, the design of the angle locking mechanism 8 also fully considers the convenience of maintenance. Since the matching relationship between the locking pin 81 and the slot is simple and clear, when maintenance or overhaul is required, the locking pin 81 can be easily pulled out (that is, the insertion and removal of the locking pin 81 can also be achieved manually), and the angle adjustment translation magnetic plate 6, the integrated angle adjustment wheel 4 and the turbine stator blade 5 can be inspected or replaced. This design not only reduces the difficulty and cost of maintenance, but also improves the reliability and service life of the equipment.

[0040] In one embodiment of the present invention, the mechanically locked stator blade angle steam turbine further comprises a connecting rod 71 , and both ends of the connecting rod 71 are respectively transmission-connected to the angle adjustment driving mechanism 7 and the angle adjustment translational magnetic plate 6 .

[0041] Specifically, the angle adjustment drive mechanism 7 serves as the power source for adjusting the angle of the stator blades, and the power output by the angle adjustment drive mechanism 7 needs to be transmitted to the angle adjustment translation magnetic plate 6 in an effective way to drive the magnetic plate to translate horizontally left and right. The connecting rod 71 plays this bridge role. Through the transmission connection of the connecting rod 71, the angle adjustment drive mechanism 7 can accurately transmit power to the magnetic plate, thereby driving the integrated angle adjustment wheel 4 to make a small angle circular rotation, thereby realizing the adjustment of the angle of the turbine stator blade 5. This design not only simplifies the transmission mechanism, but also improves the efficiency and stability of the transmission. Compared with the traditional complex transmission mechanism, the design of the connecting rod 71 is more concise and clear, reduces the number of components, reduces maintenance costs, and improves the reliability of the system. At the same time, the transmission mode of the connecting rod 71 can also ensure the accuracy of power transmission, making the adjustment of the stator blade angle more accurate, thereby optimizing the aerodynamic performance of the turbine and improving the overall efficiency. In addition, the introduction of the connecting rod 71 also enhances the adaptability and flexibility of the turbine with mechanically locked stator blade angle. Under different working conditions, the angle adjustment drive mechanism 7 can adjust the output power size and direction according to actual needs, and the connecting rod 71 can accurately transmit these changes to the angle adjustment translation magnetic plate 6, thereby realizing precise adjustment of the stationary blade angle. This adaptability and flexibility enables the steam turbine to better cope with various complex and changeable working conditions, and improves the operation economy and safety of the power station.

[0042] In one embodiment of the present invention, the angle adjustment translational magnetic plate 6 has a translational magnetic strip 61 on the outer side close to the integrated angle adjustment wheel 4 , and the translational magnetic strip 61 is used to correspond to and adapt to the integrated angle adjustment wheel 4 .

[0043] Specifically, the translational magnetic strip 61 is a key component of the angle adjustment translational magnetic plate 6, and it is closely matched with the outer side of the integrated angle adjustment wheel 4 through magnetic action. When the angle adjustment drive mechanism 7 drives the angle adjustment translational magnetic plate 6 to translate horizontally left and right through the connecting rod 71, the translational magnetic strip 61 will move accordingly, and drive the integrated angle adjustment wheel 4 to rotate in a small angle through the magnetic action. This non-contact magnetic drive method not only avoids friction and wear in traditional mechanical transmission, improves transmission efficiency, but also makes the angle adjustment process more stable and precise. The outer side of the integrated angle adjustment wheel 4 is designed with an outer meshing magnetic wheel 41 corresponding to the translational magnetic strip 61. The magnetic action between the outer meshing magnetic wheel 41 and the translational magnetic strip 61 ensures the accuracy and reliability of the angle adjustment. When the translational magnetic strip 61 moves, it drives the outer meshing magnetic wheel 41 to rotate through magnetic action, thereby driving the entire integrated angle adjustment wheel 4 to perform circular motion. This design not only simplifies the transmission structure, but also improves the response speed and stability of the system.

[0044] In one embodiment of the present invention, the outer side of the integrated angle adjustment wheel 4 has an external meshing magnetic wheel 41 , and the external meshing magnetic wheel 41 is used to correspond and adapt to the translational magnetic strip 61 .

[0045] Specifically, when the angle adjustment drive mechanism 7 drives the angle adjustment translational magnetic plate 6 to translate horizontally to the left and right through the connecting rod 71, the translational magnetic strip 61 will move accordingly, and drive the external meshing magnetic wheel 41 to rotate through the magnetic force. This rotational motion then drives the integrated angle adjustment wheel 4 to rotate in a small angle, thereby achieving precise adjustment of the angle of the turbine stator blade 5. The magnetic force between the external meshing magnetic wheel 41 and the translational magnetic strip 61 not only ensures the accuracy and reliability of the angle adjustment, but also improves the efficiency and stability of the transmission. Compared with traditional mechanical transmission methods, this non-contact magnetic transmission avoids friction and wear, extends the service life of the equipment, and reduces maintenance costs. At the same time, the magnetic transmission has a faster response speed, making the adjustment of the stator blade angle faster and more precise.

[0046] In one embodiment of the present invention, an inner side of the integrated angle adjustment wheel 4 has an inner meshing magnetic wheel 42 , and the inner meshing magnetic wheel 42 is used to correspond and adapt to the plurality of steam turbine stator blades 5 .

[0047] Specifically, when the integrated angle adjustment wheel 4 rotates in a small circular angle driven by the outer meshing magnetic wheel 41, the inner meshing magnetic wheel 42 will also rotate accordingly. This rotational motion is transmitted to the stator blade rotating magnetic wheel 53 through magnetic force, thereby driving the turbine stator blade 5 to adjust the angle. The magnetic force between the inner meshing magnetic wheel 42 and the stator blade rotating magnetic wheel 53 not only ensures the accuracy and reliability of the stator blade angle adjustment, but also realizes the synchronous adjustment of the stator blade angle. Since the integrated angle adjustment wheel 4 can realize the synchronous variable angle adjustment of all stator blades through one driving source, this design greatly simplifies the adjustment mechanism, reduces the number of components, reduces maintenance costs, and improves the reliability of the system.

[0048] Based on the above analysis, it can be seen that the internal meshing magnetic wheel 42 arranged on the inner side of the integrated angle adjustment wheel 4 achieves accurate, synchronous, smooth and efficient adjustment of the stator blade angle through its corresponding adaptation with the stator blade rotating magnetic wheel 53.

[0049] In one embodiment of the present invention, the tops 52 of the plurality of steam turbine stator blades 5 each have a stator blade rotating magnetic wheel 53 , and the stator blade rotating magnetic wheel 53 is used to correspond and adapt to the internal meshing magnetic wheel 42 .

[0050] Specifically, the stator blade rotating magnetic wheel 53 is a key component of the steam turbine stator blade 5. It is tightly meshed with the inner meshing magnetic wheel 42 on the inner side of the integrated angle adjustment wheel 4 through magnetic force. When the integrated angle adjustment wheel 4 is driven by the outer meshing magnetic wheel 41 on the outer side to make a small-angle circular rotation, the inner meshing magnetic wheel 42 on the inner side will also rotate accordingly. This rotational motion is transmitted to the stator blade rotating magnetic wheel 53 through magnetic force, thereby driving the steam turbine stator blade 5 to make precise angle adjustments. The magnetic force between the stator blade rotating magnetic wheel 53 and the inner meshing magnetic wheel 42 not only ensures the accuracy and reliability of the stator blade angle adjustment, but also realizes the synchronous and smooth adjustment of the stator blade angle. Due to the design of the stator blade rotating magnetic wheel 53, the stator blade can maintain stable rotation during the adjustment process, avoiding problems such as jamming and wear that may occur in traditional mechanical transmission, thereby improving the overall performance and reliability of the steam turbine. When the steam turbine is under low load or deviates from the design working condition, the angle adjustment driving mechanism 7 will adjust the output power size and direction according to actual needs, and drive the angle adjustment translational magnetic plate 6 to translate horizontally left and right. This movement drives the integrated angle adjustment wheel 4 to rotate in a small angle circle through the cooperation of the translational magnetic strip 61 and the external meshing magnetic wheel 41. The internal meshing magnetic wheel 42 on the inner side of the integrated angle adjustment wheel 4 is tightly meshed with the stator blade rotating magnetic wheel 53, transmitting the rotational motion to the stator blade to adjust the angle of the stator blade. When the angle adjustment is completed, the locking pin 81 of the angle locking mechanism 8 will be inserted into the slot on the edge side of the angle adjustment translational magnetic plate 6, completely locking the angle of the stator blade to prevent displacement and vibration under the strong impact of the steam flow.

[0051] In one embodiment of the present invention, the angle adjustment drive mechanism 7 is driven by hydraulic pressure or a stepping motor.

[0052] Specifically, hydraulic drive, as a mature and stable driving mode, performs well in situations requiring large torque and precise control with its high power density, fast response and smooth movement. In a mechanically locked stator blade angle steam turbine, the hydraulic drive mechanism can quickly and accurately provide the required power for the angle adjustment translation magnetic plate 6, driving it to translate horizontally left and right. This translational motion further drives the integrated angle adjustment wheel 4 to rotate in a small angle circularly through magnetic coupling, thereby achieving precise adjustment of the stator blade angle. The advantage of hydraulic drive is that it can provide continuous and stable power output and fast response speed, which can meet the needs of the steam turbine for rapid adjustment of the stator blade angle under different load conditions. As a digitally controlled driving mode, stepper motor drive also shows its unique advantages in the angle adjustment drive mechanism 7. Stepper motors have the characteristics of high positioning accuracy, simple control, and easy digital control, and are very suitable for situations requiring precise angle control. In a mechanically locked stator blade angle steam turbine, the stepper motor drive mechanism can accurately control the translation distance and speed of the angle adjustment translation magnetic plate 6, thereby achieving precise adjustment of the stator blade angle. In addition, the stepper motor drive also has good repeatability and reliability, which can ensure the stability and safety of the steam turbine during long-term operation. By adopting hydraulic drive or stepper motor drive, the angle adjustment drive mechanism 7 can be flexibly selected according to actual needs to meet the stator blade angle adjustment requirements under different working conditions.

[0053] In one embodiment of the present invention, the turbine shaft system 1 and the shaft system wheel 2 are integrally formed.

[0054] Specifically, the one-piece molding can ensure that the connection between the turbine shaft system 1 and the shaft system wheel 2 is extremely firm, avoiding the loosening or detachment problems that may occur in the traditional connection method, thereby improving the stability and reliability of the entire shaft system. In a high-speed rotating mechanical device such as a steam turbine, the stability of the shaft system is crucial, because any slight shaking or imbalance may cause vibration, noise, and even damage to the equipment. The one-piece molding design reduces potential failure points by eliminating connecting parts, making the shaft system more stable during operation, which helps to improve the operating efficiency and life of the steam turbine. In addition, the one-piece molding also helps to improve the coaxiality of the turbine shaft system 1 and the shaft system wheel 2. In the traditional assembly method, since the shaft system and the wheel are manufactured separately and then connected together, it is difficult to ensure that the axes of the two are completely coincident. The deviation of coaxiality will cause imbalance during the rotation process, and then generate vibration and noise, affecting the performance of the steam turbine. The one-piece molding can ensure that the shaft system and the wheel maintain a high degree of coaxiality during the manufacturing process, thereby reducing the impact of these adverse factors. In addition, the one-piece molding is also conducive to simplifying the manufacturing and assembly process. In the traditional manufacturing process, the shaft system and the impeller need to be manufactured separately, and then precisely processed and assembled to ensure the matching accuracy of the two. This process is not only time-consuming and labor-intensive, but also requires high-precision processing equipment and technology. In one-piece molding, the shaft system and the impeller can be manufactured as a whole, which simplifies the processing and assembly process and reduces manufacturing costs and time. Finally, the one-piece design also helps to improve the overall rigidity and strength of the steam turbine. Since the shaft system and the impeller are a whole, they can jointly withstand various forces and vibrations during operation without the problem of local stress concentration. This holistic design makes the steam turbine more reliable when dealing with emergencies or extreme conditions, and helps protect the equipment from damage.

[0055] In one embodiment of the present invention, the steam turbine with mechanically locked stator blade angle further comprises a plurality of steam turbine moving blades, which are respectively arranged in the cylinder 3 , and the plurality of steam turbine moving blades and the plurality of steam turbine stator blades 5 are arranged alternately.

[0056] Specifically, when the steam enters the cylinder 3, it will first encounter a row of stationary blades, which are carefully designed into specific shapes and angles to guide the steam to flow along a predetermined path and adjust the speed and pressure distribution of the steam. Guided by the stationary blades, the steam impacts the moving blades at a more suitable angle and speed, and the moving blades rotate using this impact force. Subsequently, the steam continues to flow through the next row of stationary blades, is guided and adjusted again, and then impacts the next row of moving blades. This process is repeated continuously in the cylinder 3, and the energy of the steam is gradually converted into mechanical energy, driving the turbine shaft system 1 to rotate continuously. The alternating arrangement of multiple turbine moving blades and multiple turbine stationary blades 5 in the present invention not only ensures the energy conversion efficiency of the turbine during normal operation, but also provides the necessary structural support for the variable adjustment of the stationary blade angle. Since the angle of the stationary blade can be dynamically adjusted according to the actual operating conditions of the turbine, the turbine can better adapt to different loads and operating conditions, reduce flow losses, and improve operating efficiency. At the same time, the alternating arrangement of moving blades and stationary blades also ensures that the turbine can maintain a stable flow field and aerodynamic performance when adjusting the stationary blade angle, avoiding flow field turbulence or performance degradation caused by changes in the stationary blade angle.

[0057] In practical applications, the mechanically locked stator blade angle steam turbine of the present invention comprises a steam turbine shaft system 1, a shaft system wheel 2, a cylinder 3, an integrated angle adjustment wheel 4, a plurality of steam turbine stator blades 5, an angle adjustment translational magnetic plate 6, an angle adjustment drive mechanism 7, an angle locking mechanism 8 and a plurality of steam turbine moving blades. Steam turbines are generally designed for aerodynamics such as stator blades and moving blades according to the optimal efficiency under rated power and full load conditions. When operating under rated power and full load conditions, the stator blade angle is at the original design angle θ1 (first position). For different low-load bias conditions, different stator blade optimization angles θ2 (second position 51) can be obtained according to analysis and design. When the steam turbine is in a certain low-load bias condition, the stator blades are adjusted according to the corresponding designed optimization angle.

[0058] The angle adjustment driving mechanism 7 drives the angle adjustment translation magnetic plate 6 to translate horizontally to the left and right by using the connecting rod 71. The translation magnetic strip 61 drives the outer meshing magnetic wheel 41 to move, thereby driving the integrated angle adjustment rotating wheel 4 to rotate in a small angle range (such as Figure 2 The integrated angle adjustment runner 4 has an internal meshing magnetic wheel 42, which can mesh with the rotating magnetic wheel of the turbine stator 5 at the top 52 of the turbine stator 5, driving the top 52 of the stator to rotate, and then driving the turbine stator 5 to rotate from the original position to the second position 51, thereby achieving the adjustment of the stator angle (as shown in FIG. Figure 4 shown).

[0059] When an angle adjustment is completed, the locking pin 81 of the angle locking mechanism 8 is inserted into the slot on the edge of the angle adjustment translational magnetic plate 6, and the movement of the angle adjustment translational magnetic plate 6, the integrated angle adjustment runner 4 and the turbine stator blade 5 is completely locked to prevent the turbine stator blade 5 from being offset by the impact of the turbine steam flow (such as Figure 3 The angle adjustment drive mechanism 7 may be driven by hydraulic pressure or a stepping motor.

[0060] In summary, the mechanically locked stator blade angle steam turbine of the present invention has the following beneficial effects:

[0061] 1. The present invention adopts a variable stator blade design, so that the angle of the stator blade can be adjusted according to actual needs when the steam turbine is under low load or deviates from the design working condition, thereby optimizing the steam flow path, improving the aerodynamic performance, and improving the overall efficiency of the steam turbine. This flexibility helps to reduce energy waste and improve the operating economy of the power station;

[0062] 2. The integrated angle adjustment wheel design of the present invention can achieve synchronous angle adjustment of all stationary blades through one driving source. This design simplifies the adjustment mechanism, reduces the number of components, reduces maintenance costs, and improves system reliability;

[0063] 3. The present invention adopts non-contact magnetic drive technology, and realizes high-reliability adjustment of angles through the cooperation of the translational magnetic strip and the external meshing magnetic wheel. This design avoids contact mechanical wear, prolongs the service life of the equipment, and improves the accuracy and stability of adjustment.

[0064] 4. The angle locking mechanism of the present invention realizes mechanical locking of the angle of the stator blades by the cooperation of the locking pin and the slot. This design can effectively prevent the angle deviation and vibration of the turbine stator blades under the strong impact of the steam flow, thereby ensuring the safety and stability of the turbine.

[0065] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A steam turbine with mechanically locked stator blade angle, characterized in that: include: Steam turbine shafting; A shafting wheel disc, mounted on the steam turbine shafting; a cylinder, in which the turbine shaft system and the shaft system wheel are installed; A plurality of steam turbine stationary blades are respectively arranged in the cylinder, and the tops of the plurality of steam turbine stationary blades extend out of the cylinder; An integrated angle adjustment wheel is arranged outside the cylinder, and the interior of the integrated angle adjustment wheel is adapted to correspond to the plurality of turbine stator blades; An angle adjustment translational magnetic plate is arranged outside the integrated angle adjustment rotating wheel, the angle adjustment translational magnetic plate is used to correspond to and adapt to the outside of the integrated angle adjustment rotating wheel, and a plurality of slots are respectively provided on both side edges of the angle adjustment translational magnetic plate; An angle adjustment driving mechanism is transmission-connected to the angle adjustment translational magnetic plate, and the angle adjustment driving mechanism is used to drive the angle adjustment translational magnetic plate to translate horizontally to the left and right, thereby driving the integrated angle adjustment wheel to make a small-angle circular rotation, thereby driving the plurality of steam turbine stator blades to rotate from the first position to the second position; as well as An angle locking mechanism is arranged on the cylinder, and the angle locking mechanism is used to correspond to and adapt to the multiple slots of the angle-adjusting translational magnetic plate.

2. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: The angle locking mechanism comprises: a body, the body being disposed on the cylinder; and Two locking pins are respectively arranged at two ends of the body, and the two locking pins are used to correspond to and adapt to the multiple slots.

3. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: It also includes a connecting rod, both ends of which are respectively connected to the angle adjustment driving mechanism and the angle adjustment translational magnetic plate.

4. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: The angle adjustment translational magnetic plate has a translational magnetic strip on the outer side close to the integrated angle adjustment rotating wheel, and the translational magnetic strip is used to correspond and adapt to the integrated angle adjustment rotating wheel.

5. The mechanically locked stator blade angle steam turbine according to claim 4, characterized in that: The outer side of the integrated angle adjustment wheel is provided with an external meshing magnetic wheel, and the external meshing magnetic wheel is used to correspond and adapt to the translational magnetic strip.

6. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: The inner side of the integrated angle adjustment wheel is provided with an internal meshing magnetic wheel, and the internal meshing magnetic wheel is used to correspond and adapt to the plurality of steam turbine stator blades.

7. The mechanically locked stator blade angle steam turbine according to claim 6, characterized in that: The tops of the plurality of steam turbine stator blades are each provided with a stator blade rotating magnetic wheel, and the stator blade rotating magnetic wheel is used to correspond and adapt to the internal meshing magnetic wheel.

8. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: The angle adjustment driving mechanism is driven by hydraulic pressure or stepping motor.

9. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: The steam turbine shaft system and the shaft system wheel are integrally formed.

10. The mechanically locked stator blade angle steam turbine according to claim 1, characterized in that: It also includes a plurality of steam turbine moving blades, which are respectively arranged in the cylinders, and the plurality of steam turbine moving blades and the plurality of steam turbine stationary blades are arranged alternately.

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