Cylinder separation transmission movable and static blade angle adjustment steam turbine

Abstract

The invention discloses a cylinder-separated transmission movable and static blade angle adjusting steam turbine which comprises a steam turbine shaft system, a shaft system wheel disc, a steam cylinder, a plurality of steam turbine static blades and a plurality of cylinder-separated transmission driving mechanisms. And the shafting wheel disc is arranged on the steam turbine shafting. The steam turbine shaft system and the shaft system wheel disc are installed in the air cylinder, and the air cylinder is provided with a plurality of cylinder body arch structures. The multiple steam turbine stationary blades are arranged in the air cylinder, and the tops of the multiple steam turbine stationary blades are located in the multiple cylinder body arched structures. And the plurality of cylinder separation transmission driving mechanisms are respectively arranged outside the plurality of cylinder body arched structures. Therefore, according to the cylinder separation transmission movable and static blade angle adjustment steam turbine, pneumatic improvement and efficiency improvement of the steam turbine under the low-load deviation working condition are achieved, and the situation that high-pressure steam leaks out of a cylinder through a gap of a cylinder penetrating structure at the top of the static blade, and consequently working medium and heat losses are caused can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of energy and power station, and in particular to a cylinder-separated transmission stator blade angle-adjustable steam turbine. 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 turbines usually use a fixed stator structure, which can maintain good aerodynamic performance and efficiency under the design conditions of the steam turbine. However, when the steam turbine is running at low load or deviates from the design conditions, the fixed stator may not be able to adapt to the changes in airflow, resulting in a decrease in aerodynamic performance and efficiency, and may even cause vibration and noise problems in the steam turbine.

[0003] In order to improve the performance of steam turbines under low load or off-center conditions, variable stator blade technology has emerged. Variable stator blade technology adjusts the angle or position of the stator blades to adapt to the airflow requirements under different operating conditions, thereby optimizing the aerodynamic performance of the steam turbine and improving efficiency. However, existing variable stator blade technology usually has some problems, such as complex transmission mechanism, low reliability, and high maintenance cost.

[0004] In addition, in high-pressure steam turbines, the top of the stationary blade usually needs to pass through the cylinder wall to connect to the transmission mechanism. This through-cylinder structure is prone to gap leakage under the action of high-pressure steam, resulting in loss of working fluid and heat, further affecting the efficiency and operating economy of the steam turbine.

[0005] Therefore, there is an urgent need for a new type of variable stator blade steam turbine that can not only flexibly adjust the angle or position of the stator blade to adapt to the airflow requirements under different operating conditions, but also prevent high-pressure steam from leaking through the gap of the cylinder structure at the top of the stator blade, thereby improving the efficiency and operating reliability of the steam turbine. Summary of the invention

[0006] The object of the present invention is to provide a turbine with an angle-adjustable stator blade driven by a cylinder separation, which realizes aerodynamic improvement and efficiency enhancement under low-load biased working conditions of the turbine, and can prevent high-pressure steam from leaking out of the cylinder through the gap of the cylinder-penetrating structure at the top of the stator blade, thereby causing working fluid and heat loss.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a turbine with an angle-adjustable stator blade driven by a cylinder separation, comprising: a turbine shaft system, a shaft system wheel, a cylinder, a plurality of turbine stator blades and a plurality of cylinder separation transmission drive mechanisms. 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, and the cylinder has a plurality of cylinder arch structures. The plurality of turbine stator blades are respectively arranged in the cylinder, and the tops of the plurality of turbine stator blades are located in the plurality of cylinder arch structures. The plurality of cylinder separation transmission drive mechanisms are respectively installed on the outside of the plurality of cylinder arch structures, and the plurality of cylinder separation transmission drive mechanisms are used to drive the plurality of turbine stator blades to rotate in a circle, so that the plurality of turbine stator blades rotate from a first position to a second position.

[0008] In one embodiment of the present invention, the materials of the plurality of cylinder arch structures are all magnetically permeable materials.

[0009] In one embodiment of the present invention, the cylinder separation transmission drive mechanism comprises: a body, an external magnetic strip and a drive unit. The external magnetic strip is arranged in the body, and the external magnetic strip is used to correspond to and adapt to the top of the turbine stator blade. And the drive unit is used to drive the body to rotate.

[0010] In one embodiment of the present invention, the top of the steam turbine stator blade has an inner magnetic strip, and the inner magnetic strip is used to correspond and adapt to the outer magnetic strip of the cylinder separation transmission drive mechanism.

[0011] In one embodiment of the present invention, when the driving unit drives the body to rotate, it can drive the outer magnetic strip to rotate, thereby driving the inner magnetic strip to rotate, and further driving the turbine stator blades to rotate in a circle.

[0012] In one embodiment of the present invention, the driving unit is driven by hydraulic pressure or stepping motor.

[0013] In one embodiment of the present invention, the turbine shaft system and the shaft system wheel are integrally formed.

[0014] In one embodiment of the present invention, the cylinder-interval transmission stator blade angle adjustment steam turbine further comprises a plurality of turbine moving blades respectively disposed in the cylinders, and the plurality of turbine moving blades and the plurality of turbine stator blades are alternately arranged.

[0015] Compared with the prior art, the cylinder-separated transmission stator blade angle-adjustable steam turbine according to the present invention has the following beneficial effects:

[0016] 1. The turbine stator blades are driven to rotate in a circle through the cylinder drive mechanism, which enables flexible adjustment of the stator blade angle or position. This adjustment can adapt to the airflow requirements under different working conditions and optimize the aerodynamic performance of the turbine, especially under low load or biased working conditions, which significantly improves the efficiency of the turbine.

[0017] 2. The top of the turbine stator blade is located inside the cylinder arch structure, while the cylinder separation drive mechanism is installed outside the cylinder arch structure. This design effectively prevents high-pressure steam from leaking out of the cylinder through the gap of the cylinder structure at the top of the stator blade, thereby reducing the loss of working fluid and heat and improving the operating economy of the turbine;

[0018] 3. The cylinder separation drive mechanism adopts magnetic transmission mode, which drives the turbine stator blades to rotate through the interaction between the external magnetic strip and the internal magnetic strip. This transmission mode simplifies the transmission mechanism of the traditional variable stator blade technology, improves the reliability and maintainability of the system, and reduces the maintenance cost;

[0019] 4. The cylinder-interval-driven stator-blade angle-adjustable steam turbine of the present invention can be applied to different types of steam turbines, including high-pressure steam turbines. By adjusting the angle or position of the stator blades, it can adapt to the airflow requirements under different working conditions and improve the adaptability and flexibility of the steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a schematic cross-sectional structure diagram of a steam turbine with cylinder-interval transmission and stator blade angle adjustment according to an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a cylinder-separated transmission drive mechanism of a cylinder-separated transmission stator blade angle adjustment steam turbine according to an embodiment of the present invention.

[0022] Description of main reference numerals:

[0023] 1-steam turbine shaft system, 2-shaft system wheel, 3-cylinder, 31-cylinder arch structure, 4-cylinder transmission drive mechanism, 41-external magnetic strip, 42-drive unit, 5-steam turbine stator blade, 51-top, 52-inner magnetic strip. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] To facilitate understanding, the main implementation concepts of the embodiments of the present invention are first briefly described.

[0027] As the core power equipment in the field of energy and power plant technology, the performance of steam turbines is directly related to the efficiency of energy conversion and the economy of power plant operation. Traditional steam turbine designs usually adopt a fixed stator structure, which can show good aerodynamic performance and efficiency under the design conditions of the steam turbine, that is, under specific operating conditions and parameters. However, in actual operation, steam turbines often face various changes in operating conditions, especially when operating at low load or deviating from the design conditions, the limitations of fixed stator blades are fully revealed.

[0028] Fixed stators may not be able to effectively adapt to changes in airflow under low load or off-center conditions, resulting in a significant decrease in aerodynamic performance and efficiency. More seriously, this inadaptability may cause vibration and noise problems in the steam turbine, which not only affects the stable operation of the steam turbine, but may also damage the equipment and increase maintenance costs. Therefore, how to improve the performance of steam turbines under low load or off-center conditions has become an urgent problem to be solved in the industry.

[0029] The emergence of variable stator blade technology provides an effective solution to this problem. By adjusting the angle or position of the stator blades, the variable stator blade technology enables the steam turbine to better adapt to the airflow requirements under different working conditions, thereby optimizing aerodynamic performance and improving efficiency. However, the existing variable stator blade technology is not perfect. Its transmission mechanism is often complex and unreliable, and the maintenance cost is relatively high. These problems limit the widespread application and promotion of variable stator blade technology.

[0030] Especially in high-pressure steam turbines, the cylinder-penetrating structure at the top of the stator blade has become a thorny problem. Since the top of the stator blade needs to pass through the cylinder wall to connect to the transmission mechanism, this cylinder-penetrating structure is prone to gap leakage under the action of high-pressure steam. The leaked high-pressure steam not only takes away a large amount of working fluid and heat, resulting in a decrease in the efficiency and operating economy of the steam turbine, but may also damage other components of the steam turbine, further increasing maintenance costs.

[0031] Therefore, the industry urgently needs a new type of variable stator blade steam turbine, which can not only flexibly adjust the stator blade angle or position to meet the airflow requirements under different working conditions, but also effectively prevent the leakage of high-pressure steam through the gap of the cylinder structure at the top of the stator blade. This type of steam turbine will be able to significantly improve the efficiency and operational reliability of the steam turbine, reduce maintenance costs, and improve energy conversion efficiency, which is of great significance to promoting progress in the fields of energy and power station technology.

[0032] The inventors have discovered the above-mentioned defects in the prior art, and the present invention provides a steam turbine with stator blade angle adjustment with cylinder separation transmission, which realizes flexible adjustment of the stator blade angle or position, and avoids the gap leakage problem of high-pressure steam. It not only simplifies the transmission mechanism, improves the reliability and maintainability of the system, but also reduces the maintenance cost and improves the adaptability and flexibility of the steam turbine.

[0033] Figure 1 2 is a schematic cross-sectional structure diagram of a steam turbine with cylinder-interval transmission and stator blade angle adjustment according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a cylinder-separated transmission drive mechanism 4 of a cylinder-separated transmission stator blade angle adjustment steam turbine according to an embodiment of the present invention.

[0034] like Figure 1 to Figure 2 As shown, a turbine with an inter-cylinder transmission and an angle-adjustable stator blade according to a preferred embodiment of the present invention comprises: a turbine shaft system 1, a shaft system wheel disc 2, a cylinder 3, a plurality of turbine stator blades 5, and a plurality of inter-cylinder transmission drive mechanisms 4. The shaft system wheel disc 2 is mounted on the turbine shaft system 1. The turbine shaft system 1 and the shaft system wheel disc 2 are mounted in the cylinder 3, and the cylinder 3 has a plurality of cylinder arch structures 31. The plurality of turbine stator blades 5 are respectively arranged in the cylinder 3, and the tops 51 of the plurality of turbine stator blades 5 are located in the plurality of cylinder arch structures 31. The plurality of inter-cylinder transmission drive mechanisms 4 are respectively mounted on the outside of the plurality of cylinder arch structures 31, and the plurality of inter-cylinder transmission drive mechanisms 4 are used to drive the plurality of turbine stator blades 5 to rotate in a circle, so that the plurality of turbine stator blades 5 rotate from a first position to a second position.

[0035] Specifically, the turbine shaft system 1 and the shaft system wheel 2 are the core rotating parts of the turbine. The shaft system wheel 2 is installed on the turbine shaft system 1, and the two together constitute the rotating parts of the turbine. These parts are installed in the cylinder 3, which is the outer shell of the turbine and provides support and protection for the internal rotating parts and stationary blades. There are multiple cylinder arch structures 31 on the cylinder 3, which not only provide installation space for the turbine stationary blades 5, but also provide installation positions for the cylinder separation transmission drive mechanism 4. This design allows the stationary blades and the drive mechanism to fit closely, while avoiding the leakage of high-pressure steam through the gap of the cylinder structure through the top 51 of the stationary blade. Multiple turbine stationary blades 5 are respectively arranged in the cylinder 3. These stationary blades are fixed parts in the turbine. Their function is to guide the airflow so that the airflow forms a favorable flow path inside the turbine, thereby improving the efficiency of the turbine. The top 51 of the stationary blade is located in the cylinder arch structure 31. This arrangement ensures the stability and sealing of the stationary blade. In order to achieve flexible adjustment of the angle or position of the stator blades, the present invention introduces a plurality of cylinder-separated transmission drive mechanisms 4. These drive mechanisms are respectively installed on the outside of the cylinder arch structure 31, and they drive the turbine stator blades 5 to rotate in a circle through magnetic transmission or other non-contact transmission methods. This transmission method not only simplifies the transmission mechanism of the traditional variable stator blade technology, but also improves the reliability and maintainability of the system. When the cylinder-separated transmission drive mechanisms 4 are activated, they will drive the turbine stator blades 5 to rotate from the first position to the second position. This rotation can be flexibly adjusted according to the operating conditions and airflow requirements of the steam turbine, thereby optimizing the aerodynamic performance of the steam turbine and improving efficiency. For example, at low load or deviation from the design operating conditions, by adjusting the angle or position of the stator blades, the flow conditions of the airflow inside the steam turbine can be improved, and the flow loss and vortex phenomenon can be reduced, thereby improving the efficiency and stability of the steam turbine.

[0036] In one embodiment of the present invention, the material of the plurality of cylinder arch structures 31 is all magnetically permeable material.

[0037] Specifically, the cylinder arch structure 31 not only serves as a storage space for the top 51 of the turbine stator blade 5, but also undertakes the important task of cooperating with the cylinder separation transmission drive mechanism 4. In order to achieve this function, the material selection of the cylinder arch structure 31 is particularly important. In the present invention, the selection of magnetically permeable material as the material of the cylinder arch structure 31 is based on the requirements of magnetic transmission technology. Magnetically permeable material refers to a material that allows the magnetic field to penetrate and pass through (for example, it can be a titanium alloy). This material has unique application value in the magnetic transmission system. When the outer magnetic strip 41 in the cylinder separation transmission drive mechanism 4 generates a magnetic field, the magnetic field needs to be able to penetrate the cylinder arch structure 31 and interact with the inner magnetic strip 52 at the top 51 of the turbine stator blade 5. In this way, through the transmission of magnetic force, the cylinder separation transmission drive mechanism 4 can drive the turbine stator blade 5 to rotate in a circle, thereby adjusting the angle or position of the stator blade. Among them, the magnetically permeable material has good magnetic permeability, which can ensure the effective transmission of the magnetic field and improve the efficiency and accuracy of the magnetic transmission. Among them, magnetically permeable materials usually have high strength and corrosion resistance, and can withstand the high temperature and high pressure environment generated during the operation of the steam turbine, ensuring the long-term stable operation of the equipment. In addition, the selection of magnetically permeable materials also simplifies the structural design of the steam turbine. In traditional variable stator blade technology, in order to achieve the adjustment of the stator blades, a complex transmission mechanism is often required. The present invention simplifies the transmission mechanism and improves the reliability and maintainability of the system by adopting a magnetic transmission method and magnetically permeable materials. At the same time, the use of magnetically permeable materials also reduces the maintenance cost of the equipment, because the magnetic transmission system has fewer wear parts and a lower failure rate than the traditional mechanical transmission system.

[0038] In one embodiment of the present invention, the cylinder separation transmission drive mechanism 4 comprises: a body, an external magnetic strip 41 and a drive unit 42. The external magnetic strip 41 is disposed in the body, and the external magnetic strip 41 is used to correspond to and adapt to the top 51 of the turbine stator blade 5. And the drive unit 42 is used to drive the body to rotate.

[0039] Specifically, the cylinder-separated transmission drive mechanism 4 is mainly composed of three parts: a main body, an external magnetic strip 41 and a drive unit 42. This mechanism is cleverly installed on the outside of the cylinder arch structure 31 of the cylinder 3, without penetrating the wall of the cylinder 3, thereby effectively avoiding the problem of high-pressure steam leakage that may be caused by the traditional cylinder-penetrating structure. As the supporting structure of the cylinder-separated transmission drive mechanism 4, the main body not only carries the external magnetic strip 41 and the drive unit 42, but is also responsible for firmly mounting the entire drive mechanism on the cylinder 3. The design of the main body fully considers the operating environment and working conditions of the steam turbine, and adopts high-strength and corrosion-resistant materials to ensure that it can operate stably for a long time under high temperature and high pressure environments. The external magnetic strip 41 is the key to the non-contact transmission of the cylinder-separated transmission drive mechanism 4. It is carefully arranged in the main body and corresponds to the internal magnetic strip 52 at the top 51 of the turbine stator 5. Driven by the drive unit 42, the outer magnetic strip 41 can generate a strong magnetic field, and generate magnetic coupling with the inner magnetic strip 52 through the cylinder arch structure 31 (the structure adopts magnetically permeable materials, such as titanium alloy, to ensure the effective penetration of the magnetic field), thereby realizing the transmission of magnetic force. The drive unit 42 serves as the power source of the cylinder transmission drive mechanism 4, and is responsible for driving the main body and the outer magnetic strip 41 to rotate. In the present invention, the drive unit 42 can be driven by hydraulic drive or stepper motor drive. Hydraulic drive has the characteristics of strong power and fast response, which is suitable for occasions requiring a large driving force; while stepper motor drive has the advantages of precise control and smooth operation, which is suitable for occasions requiring precise adjustment of the stator blade angle. No matter which driving method is adopted, it can ensure that the cylinder transmission drive mechanism 4 can accurately and reliably drive the turbine stator blade 5 to rotate in a circle. When the drive unit 42 is started, it drives the main body and the outer magnetic strip 41 to start rotating. The magnetic field generated by the outer magnetic strip 41 rotates accordingly, penetrates into the cylinder 3 through the cylinder arch structure 31, and generates magnetic force with the inner magnetic strip 52 at the top 51 of the turbine stator blade 5. Driven by the magnetic force, the inner magnetic strip 52 and the turbine stator blade 5 connected thereto also begin to rotate in a circle. In this way, the flexible adjustment of the angle or position of the turbine stator blade 5 is achieved through the ingenious design of the cylinder separation transmission drive mechanism 4.

[0040] Based on the above analysis, it can be seen that the present invention not only simplifies the transmission mechanism of the traditional variable stator technology, improves the reliability and maintainability of the system, but also greatly reduces the maintenance cost. At the same time, since the cylinder-separated transmission drive mechanism 4 is installed outside the cylinder 3, the leakage problem of high-pressure steam is effectively avoided, and the operation economy and safety of the steam turbine are improved.

[0041] In one embodiment of the present invention, the top of the steam turbine stator blade 5 has an inner magnetic strip 52 , and the inner magnetic strip 52 is used to correspond and adapt to the outer magnetic strip 41 of the cylinder separation transmission drive mechanism 4 .

[0042] Specifically, the turbine stator 5 is a key component inside the turbine, and the adjustment of its angle and position has a vital impact on the aerodynamic performance and efficiency of the turbine. However, in the traditional variable stator technology, the adjustment of the stator often needs to be achieved through a complex transmission mechanism, which not only increases the complexity and maintenance cost of the equipment, but also may affect the reliability and stability of the equipment. In order to overcome this defect, the present invention adopts a magnetic transmission method. An inner magnetic strip 52 is provided at the top 51 of the turbine stator 5. This inner magnetic strip 52 corresponds to and adapts to the outer magnetic strip 41 in the cylinder separation transmission drive mechanism 4, and the two interact with each other through magnetic force. When the cylinder separation transmission drive mechanism 4 rotates under the action of the drive unit 42, the outer magnetic strip 41 will rotate accordingly and generate a changing magnetic field. This changing magnetic field will penetrate the cylinder body arch structure 31 of the cylinder 3 (the structure is a magnetically permeable material) and generate magnetic coupling with the inner magnetic strip 52. Under the action of magnetic coupling, the inner magnetic strip 52 will be driven by the outer magnetic strip 41 and rotate. Since the inner magnetic strip 52 is fixed to the top 51 of the turbine stator blade 5, the rotation of the inner magnetic strip 52 will drive the turbine stator blade 5 to rotate in a circle. In this way, the angle or position of the stator blade can be flexibly adjusted without a complex transmission mechanism. This magnetic transmission method simplifies the transmission mechanism and improves the reliability and maintainability of the system. Since magnetic transmission does not require physical contact, the possibility of wear and failure is reduced, and the maintenance cost is reduced. The magnetic transmission method has high transmission efficiency and accuracy, which can ensure the adjustment accuracy and response speed of the stator blade. In addition, the magnetic transmission method is also suitable for harsh environments such as high pressure and high temperature, and can meet the operation requirements of the turbine.

[0043] In one embodiment of the present invention, when the driving unit 42 drives the body to rotate, it can drive the outer magnetic strip 41 to rotate, thereby driving the inner magnetic strip 52 to rotate, and further driving the turbine stator blade 5 to rotate in a circle.

[0044] Specifically, the cylinder separation transmission drive mechanism 4 includes three main components: a body, an external magnetic strip 41 and a drive unit 42. The external magnetic strip 41 is carefully arranged inside the body, and its position corresponds to the top 51 of the turbine stator 5, ensuring that the magnetic force between the two can be carried out smoothly. The drive unit 42 is responsible for driving the body to rotate, and this rotation action is the starting point of the entire magnetic transmission process. When the drive unit 42 starts working, it will generate enough power to drive the body to rotate. Since the external magnetic strip 41 is fixed in the body, the rotation of the body will drive the external magnetic strip 41 to rotate together. The external magnetic strip 41 will generate a constantly changing magnetic field during the rotation process, which will penetrate the cylinder arch structure 31 of the cylinder 3 (the structure is a magnetically permeable material, such as titanium alloy, which can allow the magnetic field to penetrate), and then interact with the internal magnetic strip 52 at the top 51 of the turbine stator 5. The inner magnetic strip 52 is fixed to the top 51 of the turbine stator 5, and its function is to form a magnetic coupling with the outer magnetic strip 41. When the magnetic field of the outer magnetic strip 41 acts on the inner magnetic strip 52, the inner magnetic strip 52 will be affected by the magnetic force and start to rotate. Since the inner magnetic strip 52 is fixedly connected to the turbine stator 5, the rotation of the inner magnetic strip 52 will drive the turbine stator 5 to rotate in a circle. In this way, the driving unit 42 drives the body to rotate, thereby driving the outer magnetic strip 41 to rotate, and then driving the inner magnetic strip 52 and the turbine stator 5 to rotate through the magnetic force, thereby realizing the non-contact drive of the turbine stator 5. This driving method not only simplifies the transmission mechanism of the traditional variable stator technology, improves the reliability and maintainability of the system, but also makes the entire transmission process more stable and noise-free, and can adapt to various complex working conditions. In addition, this magnetic transmission method is also very flexible. By adjusting the speed and direction of the drive unit 42, the rotation speed and rotation direction of the turbine stator blades 5 can be accurately controlled, thereby achieving precise control of the aerodynamic performance of the turbine. This flexibility is of great significance for improving the adaptability and efficiency of the turbine, especially under low load or deviation from the design working conditions, by adjusting the angle or position of the stator blades, the aerodynamic performance of the turbine can be significantly improved, and its operating efficiency and stability can be improved.

[0045] In one embodiment of the present invention, the driving unit 42 is driven by hydraulic pressure or a stepping motor.

[0046] Specifically, as a mature transmission technology, hydraulic drive has the advantages of stable transmission, large torque, and easy control, and is particularly suitable for occasions requiring large driving force and precise control. In a cylinder-separated transmission stator angle adjustment steam turbine, hydraulic drive can provide stable power output, ensuring that the turbine stator 5 can accurately and quickly reach a predetermined angle or position during rotation, thereby meeting the airflow requirements under different working conditions. In addition, the pressure of the hydraulic system can be accurately controlled by a regulating valve, which makes the turbine stator adjustment more flexible and reliable. The stepper motor drive is widely used in occasions requiring high-precision position control due to its high precision, simple control, and easy digital control. In a cylinder-separated transmission stator angle adjustment steam turbine, the stepper motor drive can ensure that the rotation angle or position of the turbine stator 5 is accurately controlled, thereby optimizing the aerodynamic performance of the turbine. The movement of the stepper motor is achieved by controlling the number and frequency of pulse signals. This digital control method not only improves the control accuracy of the system, but also facilitates integration with other automation systems.

[0047] In one embodiment of the present invention, the turbine shaft system 1 and the shaft system wheel 2 are integrally formed.

[0048] Specifically, the one-piece manufacturing process can integrate the turbine shaft system 1 and the shaft system wheel 2 into a single, continuous component, eliminating the seams or connection interfaces that may exist in traditional connection methods. This design not only improves the structural integrity between the shaft system and the wheel, but also enhances the overall mechanical strength, making the turbine more stable and reliable when rotating at high speeds and bearing heavy loads. In addition, one-piece molding reduces the assembly steps between components, simplifies the manufacturing process, and helps to reduce production costs and shorten production cycles. More importantly, the elimination of the connection interface means reducing potential failure points, improving the operational reliability of the turbine, and reducing the risk of failure caused by component connection problems. During the operation of the turbine, the shaft system and the wheel will experience complex stress and temperature changes. The one-piece design can better cope with these challenges and maintain the stability and durability of the structure. Therefore, this implementation method not only improves the mechanical performance of the turbine, but also provides a strong guarantee for its long-term, efficient and stable operation.

[0049] In one embodiment of the present invention, the cylinder-interval transmission stator blade angle adjustment steam turbine further includes a plurality of turbine moving blades, which are respectively arranged in the cylinders 3 , and the plurality of turbine moving blades and the plurality of turbine stator blades 5 are alternately arranged.

[0050] Specifically, these turbine moving blades are respectively arranged in the cylinder 3, and are arranged alternately with a plurality of turbine stationary blades 5. This alternating arrangement is a classic layout in turbine design, which aims to optimize the flow path of the airflow inside the turbine and improve the aerodynamic efficiency. As the rotating part of the turbine, the turbine moving blades rotate under the drive of the turbine shaft system 1 and the shaft system wheel 2, and cooperate with the stationary blades to guide and accelerate the airflow. The stationary blades play the role of adjusting the direction and speed of the airflow and providing favorable airflow conditions for the moving blades. By adjusting the angle or position of the stationary blades by the cylinder separation transmission drive mechanism 4, the flow state of the airflow at the entrance of the moving blades can be further optimized, the flow loss can be reduced, and the work efficiency of the moving blades can be improved. Therefore, the alternating arrangement of multiple turbine moving blades and multiple turbine stationary blades 5 not only reflects the exquisiteness of the turbine design, but is also one of the key factors for achieving efficient operation of the turbine. In this structure, the mutual cooperation and coordinated work of the moving blades and the stationary blades enable the turbine to maintain good aerodynamic performance and efficiency under various operating conditions. In particular, at low load or deviating from the design operating conditions, the stationary blades can be adjusted to adapt to changes in airflow, thereby significantly improving the operating performance and reliability of the turbine.

[0051] In practical applications, the steam turbine with an angle-adjustable stator blade driven by a cylinder separation of the present invention comprises: a turbine shaft system 1, a shaft system wheel 2, a cylinder 3, a cylinder separation transmission drive mechanism 4, a turbine stator blade 5 and a turbine moving blade. The steam turbine generally performs aerodynamic design of the stator blades, moving blades, etc. according to the optimal efficiency under the rated power and full load conditions. When operating under the 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) can be obtained according to the 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. The cylinder separation transmission drive mechanism 4 rotates under the action of the driving source (driving unit 42), driving the external magnetic strip 41 to rotate. Under the action of the magnetic force, the internal magnetic strip 52 at the top 51 of the turbine stator blade 5 rotates accordingly, thereby driving the turbine stator blade 5 to make a small-angle circular rotation, thereby achieving the adjustment of the stator blade angle (such as Figure 2 As shown). The driving source may be a hydraulic drive or a stepper motor. To ensure that the magnetic force can be transmitted through the cylinder body, the cylinder body arch structure 31 at the local position of the cylinder 3 is made of a magnetically permeable material, such as a titanium alloy.

[0052] In summary, the cylinder-separated transmission stator blade angle-adjustable steam turbine of the present invention has the following beneficial effects:

[0053] 1. The turbine stator blades are driven to rotate in a circle through the cylinder drive mechanism, which enables flexible adjustment of the stator blade angle or position. This adjustment can adapt to the airflow requirements under different working conditions and optimize the aerodynamic performance of the turbine, especially under low load or biased working conditions, which significantly improves the efficiency of the turbine.

[0054] 2. The top of the turbine stator blade is located inside the cylinder arch structure, while the cylinder separation drive mechanism is installed outside the cylinder arch structure. This design effectively prevents high-pressure steam from leaking out of the cylinder through the gap of the cylinder structure at the top of the stator blade, thereby reducing the loss of working fluid and heat and improving the operating economy of the turbine;

[0055] 3. The cylinder separation drive mechanism adopts magnetic transmission mode, which drives the turbine stator blades to rotate through the interaction between the external magnetic strip and the internal magnetic strip. This transmission mode simplifies the transmission mechanism of the traditional variable stator blade technology, improves the reliability and maintainability of the system, and reduces the maintenance cost;

[0056] 4. The cylinder-interval-driven stator-blade angle-adjustable steam turbine of the present invention can be applied to different types of steam turbines, including high-pressure steam turbines. By adjusting the angle or position of the stator blades, it can adapt to the airflow requirements under different working conditions and improve the adaptability and flexibility of the steam turbine.

[0057] 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 cylinder-interval transmission and stator blade angle adjustment, characterized in that: include: Steam turbine shafting; A shafting wheel disc, mounted on the steam turbine shafting; A cylinder, wherein the turbine shaft system and the shaft system wheel are installed in the cylinder, and the cylinder has a plurality of cylinder arch structures; A plurality of steam turbine stationary blades are respectively arranged in the cylinders, and the tops of the plurality of steam turbine stationary blades are located in the plurality of cylinder arch structures; as well as A plurality of cylinder-separated transmission drive mechanisms are respectively installed on the outside of the plurality of cylinder arch structures, and the plurality of cylinder-separated transmission drive mechanisms are used to drive the plurality of steam turbine stator blades to rotate in a circle, thereby rotating the plurality of steam turbine stator blades from a first position to a second position.

2. The cylinder-separated transmission stator blade angle adjustment steam turbine according to claim 1, characterized in that: The materials of the multiple cylinder arch structures are all magnetically permeable materials.

3. The cylinder-separated drive stator blade angle adjustment steam turbine according to claim 2, characterized in that: The cylinder separation transmission driving mechanism comprises: ontology; an external magnetic strip, disposed in the body, and adapted to correspond to the top of the turbine stator blade; and The driving unit is used to drive the body to rotate.

4. The cylinder-separated transmission stator blade angle adjustment steam turbine according to claim 3, characterized in that: The top of the steam turbine stator blade has an inner magnetic strip, and the inner magnetic strip is used to correspond and adapt to the outer magnetic strip of the cylinder separation transmission drive mechanism.

5. The cylinder-separated transmission stator blade angle-adjustable steam turbine according to claim 4, characterized in that: When the driving unit drives the body to rotate, it can drive the outer magnetic strip to rotate, thereby driving the inner magnetic strip to rotate, and further driving the turbine stator blade to rotate in a circle.

6. The cylinder-separated transmission stator blade angle-adjustable steam turbine according to claim 3, characterized in that: The driving unit is driven by hydraulic pressure or stepping motor.

7. The cylinder-separated transmission stator blade angle-adjustable steam turbine according to claim 1, characterized in that: The steam turbine shaft system and the shaft system wheel are integrally formed.

8. The cylinder-separated transmission stator blade angle-adjustable 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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