A rotating diaphragm angle control device for a steam turbine

Abstract

The application discloses a rotating partition plate corner control device of a steam turbine, effectively prevents high temperature on the surface of a cylinder from being conducted to an oil motor, completely solves the oil leakage phenomenon of a sealing element on the oil motor of the rotating partition plate caused by long-term high temperature aging, guarantees the reliability and strength of connection, has good sealing performance, thereby effectively prevents steam from leaking through a spline shaft, and the cooling device is arranged on the connecting support, thereby completely solving the oil leakage phenomenon of the sealing element of the oil motor caused by long-term high temperature aging; a rotating pair mechanism with one degree of freedom is adopted in the transmission structure design of the rotating partition plate corner control device of the steam turbine, the rotating pair mechanism has excellent universality and replicability, and is suitable for rotating partition plate corner control of various steam turbines.

Description

Technical Field

[0001] This invention belongs to the field of steam turbine technology, and specifically relates to a steam turbine rotating diaphragm angle control device. Background Technology

[0002] The rotating baffle of a steam turbine is a key component used to control steam flow. It can control the direction and magnitude of steam flow inside the turbine, and can also change the steam flow direction as needed under different conditions. In this way, the load on the steam turbine can be rationally distributed, ensuring the high-efficiency operation of the unit and extending the service life of the steam turbine.

[0003] The rotating diaphragm of a steam turbine consists of two parts: stationary blades and dynamic blades. The stationary blades are mounted on the turbine casing, while the dynamic blades are mounted on the rotating components of the turbine. The diaphragm controls the flow of steam between the stationary and dynamic blades, thereby controlling the steam flow rate and direction. During turbine operation, steam enters the turbine through the first stage of the impeller. After passing through the first stage, the steam pressure and temperature decrease. The steam then enters the second stage impeller. If flow rate or direction needs adjustment, it enters the rotating diaphragm, where the steam passes through the dynamic blades, thus altering its flow direction and flow rate. This rotating diaphragm can change the inlet conditions of the next stage impeller as needed, thereby controlling the turbine's flow rate.

[0004] Currently, most rotary diaphragm angle control devices used in extraction steam turbines have drawbacks such as complex structure, high failure rate, and inconvenience in on-site installation, commissioning, and maintenance. Furthermore, the high temperature of the entire rotary diaphragm angle control device itself leads to problems such as easy aging and oil leakage of the seals in the rotary diaphragm hydraulic actuator.

[0005] Therefore, it is imperative to develop a turbine rotating diaphragm angle control device with a relatively simple structure, low failure rate, and efficient heat exchange protection. Summary of the Invention

[0006] The purpose of this invention is to provide a turbine rotating diaphragm angle control device with a simple structure, low failure rate, and high-efficiency heat exchange protection device. It effectively prevents the high temperature on the cylinder surface from being conducted to the oil motor, completely solves the oil leakage phenomenon caused by the long-term aging of the seals on the rotating diaphragm oil motor due to high temperature, ensures the reliability and strength of the connection, and has good sealing performance, thereby effectively preventing steam leakage through the spline shaft.

[0007] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: A turbine rotating diaphragm angle control device includes a hydraulic actuator and a rotating diaphragm. The hydraulic actuator is connected to the lower half of the turbine outer cylinder sidewall via a connecting bracket. The hydraulic actuator includes a piston rod, a horizontal connecting rod, and a guide rod. The piston rod has a threaded tip, and the horizontal connecting rod has a through hole in the middle. The piston rod passes through the through hole and is perpendicularly connected to the horizontal connecting rod. The piston rod is threaded at its tip to the guide rod, which guides the piston rod. Square holes are provided at both ends of the horizontal connecting rod, and each square hole is connected to a... A Y-shaped connecting rod is provided. The top ends of the two Y-shaped connecting rods are hinged to the horizontal connecting rod of the hydraulic motor. The bottom ends of the two Y-shaped connecting rods are respectively hinged to one end of a U-shaped connecting rod. The other end of the U-shaped connecting rod is fixedly connected to a spline shaft rotating mechanism. The spline shaft rotating mechanism is fixedly connected to one end of the spline shaft connecting rod through a spline fit. The other end of the spline shaft connecting rod is hinged to one end of a rotating partition connecting rod. The other end of the rotating partition connecting rod is hinged to a rotating partition. The spline shaft rotating mechanism is connected to the spline shaft connecting rod and the U-shaped connecting rod to form a single component with no relative motion relationship. A cooler is provided on the connecting bracket.

[0008] Furthermore, the cooler includes a cooling device, a cooler shell, a cooler inlet, and a cooler outlet. The cooling device is a rectangular integrated structure formed by multiple layers of corrugated flow channel plates fixedly connected. The cooler shell is a hollow, sealed rectangular shell. The cooling device is disposed inside the cooler shell, and the outer side of the cooling device is attached to and fixedly connected to the inner side of the cooler shell. The cooler inlet is located at the lower part of one side of the shell, and the cooler outlet is located at the upper part of the other side of the shell. Each layer of corrugated flow channel plate of the cooler is designed with a flow hole. The flow hole is located near the shell in the length direction of the corrugated flow channel plate, and the flow holes on adjacent corrugated flow channel plates are staggered vertically. The cooler ensures that cooling water flows from the cooling water inlet pipe into the outer side of the corrugated flow channel plate near the cooling water inlet, sequentially flowing up and down across both sides of each corrugated flow channel plate, finally reaching the outer side of the corrugated flow channel plate near the cooling water outlet, and then flowing out through the cooling water outlet pipe. Each corrugated flow channel on the cooling plate incorporates an optimized pressure drop design and turbulence enhancement design to improve cooling efficiency. This ensures optimal cooling capacity with limited cooling area and cooling water volume. Through the cooling water inlet and outlet pipe joints, the cooling system is connected to cool the rotating baffle hydraulic actuator connecting bracket, effectively preventing the high temperature on the cylinder surface from being conducted to the hydraulic actuator, thus completely solving the oil leakage problem caused by long-term high-temperature aging of the seals on the rotating baffle hydraulic actuator.

[0009] Furthermore, the corrugated flow channel plate and the outer shell are made of high-strength stainless steel.

[0010] Furthermore, the upper and lower ends of the Y-shaped connecting rod are connected to the horizontal connecting rod and the U-shaped connecting rod of the hydraulic motor respectively via pins and radial spherical bearings.

[0011] Furthermore, the spline shaft rotation mechanism includes a spline shaft housing and a spline shaft. The spline shaft housing is fixedly connected to the lower half of the outer cylinder wall of the turbine. The mounting surface of the spline shaft housing is tightly fitted with the lower half of the outer cylinder wall of the turbine. The left and right ends of the spline shaft housing are through structures. The spline shaft is installed through the spline shaft housing. The spline shaft includes a threaded section, a spline section, and a smooth shaft section. The spline section is provided with an external spline. One end of the spline shaft housing is sealed by a gland and a sealing gasket. The other end is insulated and sealed by a sliding bearing that has a diameter fit with both the spline shaft and the spline shaft housing, a rubber asbestos packing that provides axial sealing, and a pressure ring. After the smooth shaft section of the spline shaft passes through the sliding bearing, the external spline on the spline section is connected to the internal spline on the spline shaft connecting rod. The threaded section is threadedly connected to the spline shaft housing near the gland side, thereby achieving the function of axially fixing the spline shaft and sealing the spline shaft housing.

[0012] Furthermore, the bushing is fixed to the sliding bearing by screws and to the splined shaft housing by screws, and the rubber asbestos packing and pressure ring are fixed to the sliding bearing by bolts.

[0013] Furthermore, the splined shaft is also provided with an adjusting shim ring for adjusting the axial clearance between the inner wall of the splined shaft housing and the side of the splined shaft connecting rod.

[0014] Furthermore, the optical section of the spline shaft is insulated and sealed by a sleeve and a rubber asbestos gasket, and the spline shaft is fixed to the sleeve by a gasket and a nut.

[0015] Furthermore, the inner surfaces of the sleeve and sliding bearing, as well as the smooth sections on both sides of the spline shaft, are nitrided and precision ground, which not only ensures the clearance fit accuracy but also guarantees long-term wear resistance.

[0016] Furthermore, the outer cylindrical surface of the sleeve and sliding bearing transitions with the inner surface of the spline shaft housing, ensuring both excellent concentricity and tight fit.

[0017] Furthermore, radial vent holes are provided on the gland and the spline shaft housing respectively. The radial vent holes on the spline shaft housing are located at positions corresponding to the sliding bearings. A water-draining vent pipe joint is provided at the radial vent holes to promptly drain water and exhaust steam when there is abnormal steam leakage in the spline shaft rotation mechanism.

[0018] Furthermore, the end face of the broken optical axis of the spline shaft is provided with an end cap to protect the spline shaft.

[0019] When the rotating partition is in the fully closed position and the piston rod of the rotating partition hydraulic actuator is in the fully retracted position, the angle that the spline shaft needs to rotate can be calculated from the motion length dimensions of the rotating partition connecting rod and the spline shaft connecting rod, based on the angle that the rotating partition needs to rotate. When the hydraulic actuator is in the zero position, the angle between the center line of the U-shaped connecting rod and the horizontal line is below the horizontal line, and the angle is half of the angle that the spline shaft needs to rotate.

[0020] By adopting the above technical solution, the beneficial technical effects of the present invention are: 1. In this invention, the rotating baffle hydraulic actuator is mounted on the hydraulic actuator connecting bracket and does not directly contact the cylinder, thereby reducing the adverse effects of the high temperature radiated from the cylinder surface on the hydraulic actuator seals and hydraulic fluid. A cooler is installed on the hydraulic actuator connecting bracket, and the cooler employs optimized pressure drop design and turbulence enhancement design to improve cooling efficiency. This ensures optimal cooling capacity with limited cooling area and cooling water volume. The cooling system is connected to the cooling water inlet and outlet pipe joints to cool the rotating baffle hydraulic actuator connecting bracket, effectively preventing the high temperature from the cylinder surface from being conducted to the hydraulic actuator, and completely solving the oil leakage phenomenon caused by long-term high-temperature aging of the seals on the rotating baffle hydraulic actuator.

[0021] 2. In this invention, the spline shaft rotation mechanism has excellent sealing performance in its structure. The spline shaft connecting rod and the U-shaped connecting rod are connected to the spline shaft in the spline shaft rotation mechanism to form a moving component. The spline shaft and spline shaft housing are designed to ensure long-term sealing and wear resistance through precise shaft diameter matching with the sleeve and sliding bearing. The two ends of the spline shaft housing are reliably sealed to the outside world through the pressure cap, sealing gasket, rubber asbestos gasket, rubber asbestos packing, pressure ring and screw plug, thereby completely isolating the trace amount of high-temperature steam that may leak through the gap of the spline shaft diameter from the normal temperature environment, and timely draining and venting steam through the condensate drain pipe joint, which not only ensures the reliability and strength of the connection, but also has good sealing performance, thereby effectively preventing steam leakage through the spline shaft.

[0022] 3. In this invention, the entire turbine rotating diaphragm actuator has a simple design. Based on the required rotation angle α of the rotating diaphragm, the required rotation angle β of the splined shaft connecting rod can be drawn using geometric drawing. Then, by adjusting the thickness of the adjusting sleeve, the angle between the U-shaped connecting rod and the horizontal line is β / 2 below the horizontal line when the piston rod of the rotating diaphragm hydraulic actuator is fully retracted, and β / 2 above the horizontal line when the piston rod of the rotating diaphragm hydraulic actuator is fully extended. Finally, the vertical distance between the centers of the hinge holes of the U-shaped connecting rod and the Y-shaped connecting rod at the two extreme positions can be measured on the geometric diagram when the U-shaped connecting rod rotates by an angle β around the splined shaft. This distance is the working stroke of the rotating diaphragm hydraulic actuator. Then, the U-shaped connecting rod is connected and fixed to the splined shaft, ultimately ensuring that when the rotating diaphragm hydraulic actuator drives the U-shaped connecting rod to swing up and down by an equal amplitude angle β around the horizontal line, the purpose of controlling the rotation angle α of the rotating diaphragm is achieved.

[0023] 4. In this invention, a simple and reliable rotary pair mechanism with one degree of freedom is adopted in the transmission structure design of the turbine rotary diaphragm angle control device. It has excellent versatility and reproducibility and is suitable for various turbine rotary diaphragm angle control applications. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the turbine rotating diaphragm angle control device of the present invention.

[0025] Figure 2 This is a top view of the turbine rotating diaphragm angle control device of the present invention.

[0026] Figure 3 A cross-sectional view of the turbine rotating diaphragm angle control device of the present invention.

[0027] Figure 4 This is a structural diagram of the spline shaft rotation mechanism of the present invention.

[0028] Figure 5 This is a cross-sectional view of the spline shaft rotation mechanism of the present invention.

[0029] Figure 6 This is a simplified motion diagram of the turbine rotating diaphragm angle control device of the present invention.

[0030] Figure 7 This is a schematic diagram of the cooler structure of the present invention.

[0031] The components include: 1. Rotating partition connecting rod; 2. Splined shaft connecting rod; 3. Splined shaft rotation mechanism; 4. U-shaped connecting rod; 5. Y-shaped connecting rod; 6. Hydraulic actuator; 7. Hydraulic actuator horizontal connecting rod; 8. Connecting bracket; 9. Guide rod; 10. Cooler; 11. Cooler outlet; 12. Cooler inlet; 13. Radial spherical bearing; 14. Rotating partition; 3.1. Splined shaft housing; 3.2. Drainage and vent pipe joint; 3.3. Pressure cap; 3.4. Sliding bearing; 3.5. Rubber asbestos packing; 3.7. Pressure ring; 3.8. Splined shaft; 3.9. End cap; 3.10. Adjusting shim ring; 3.11. Sleeve; 3.12. Rubber asbestos gasket. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention.

[0034] Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0035] Example 1 like Figure 1-3As shown, this embodiment provides a turbine rotating diaphragm angle control device, including a hydraulic actuator 6 and a rotating diaphragm 14. The hydraulic actuator is connected to the lower half of the turbine outer cylinder sidewall via a connecting bracket 8. The hydraulic actuator includes a piston rod, a hydraulic actuator horizontal connecting rod 7, and a guide rod 9. The piston rod has a threaded top end, and the hydraulic actuator horizontal connecting rod 7 has a through hole in the middle. The piston rod passes through the through hole of the hydraulic actuator horizontal connecting rod 7 and is perpendicularly connected to the hydraulic actuator horizontal connecting rod 7. The top end of the piston rod is threaded to the guide rod 9, and the guide rod 9 guides the piston rod. The hydraulic actuator horizontal connecting rod 7 has square holes at both ends, and each square hole is connected to... A Y-shaped connecting rod 5 is connected to the top of the two Y-shaped connecting rods 5, which are hinged to the horizontal connecting rod 7 of the hydraulic motor. The bottom ends of the two Y-shaped connecting rods 5 are respectively hinged to one end of the U-shaped connecting rod 4. The other end of the U-shaped connecting rod 4 is fixedly connected to the spline shaft rotating mechanism 3. The spline shaft rotating mechanism 3 is fixedly connected to one end of the spline shaft connecting rod 2 through spline engagement. The other end of the spline shaft connecting rod 2 is hinged to one end of the rotating partition connecting rod 1. The other end of the rotating partition connecting rod 1 is hinged to the rotating partition. The spline shaft rotating mechanism 3 is connected to the spline shaft connecting rod 2 and the U-shaped connecting rod 4 to form a component with no relative motion relationship. A cooler 10 is provided on the connecting bracket 8.

[0036] like Figure 7As shown, the cooler 10 includes a cooling device, a cooler shell, a cooler inlet 12, and a cooler outlet 11. The cooling device is a rectangular integrated structure with multiple corrugated flow channel plates fixedly connected. The cooler shell is a hollow, sealed rectangular shell. The cooling device is disposed inside the cooler shell, and the outer side of the cooling device is attached to and fixedly connected to the inner side of the cooler shell. The cooler inlet 12 is located at the lower part of one side of the shell, and the cooler outlet 11 is located at the upper part of the other side of the shell. Each corrugated flow channel plate of the cooler 10 is designed with a flow hole. The flow hole is located near the shell in the length direction of the corrugated flow channel plate, and the flow holes on adjacent corrugated flow channel plates are staggered vertically. The cooler 10 ensures that cooling water flows from the cooling water inlet pipe into the outer side of the corrugated flow channel plate near the cooling water inlet, sequentially flowing up and down across both sides of each corrugated flow channel plate, finally reaching the outer side of the corrugated flow channel plate near the cooling water outlet, and then flowing out through the cooling water outlet pipe. The corrugated flow channels on each corrugated flow channel plate in the cooling plate employ optimized pressure drop and turbulence enhancement designs to improve cooling efficiency. This ensures optimal cooling capacity with limited cooling area and cooling water volume. The cooling system is connected to the rotating baffle oil motor connecting bracket 8 via the cooling water inlet and outlet pipe joints, effectively preventing high temperatures from the cylinder surface from being conducted to the oil motor. This completely solves the oil leakage problem caused by long-term high-temperature aging of the seals on the rotating baffle oil motor. The corrugated flow channel plate and the outer shell are made of high-strength stainless steel. The upper and lower ends of the Y-shaped connecting rod 5 are connected to the horizontal connecting rod 7 and the U-shaped connecting rod 4 of the oil motor respectively via pins and radial spherical bearings 13.

[0037] In this embodiment, the rotary baffle hydraulic actuator 6 is mounted on the connecting bracket 8 and does not directly contact the cylinder, thereby reducing the adverse effects of the high temperature radiated from the cylinder surface on the seals and oil on the rotary baffle hydraulic actuator 6. A cooler 10 is installed on the connecting bracket 8, which employs optimized pressure drop and turbulence enhancement designs to improve cooling efficiency. This ensures optimal cooling capacity with limited cooling area and cooling water volume. The cooling system is connected to the cooling water inlet and outlet pipe joints to cool the connecting bracket 8, effectively preventing the high temperature from the cylinder surface from being conducted to the hydraulic actuator 6, and completely solving the oil leakage problem caused by long-term high-temperature aging of the seals on the rotary baffle hydraulic actuator 6. like Figure 6As shown, the force transmission process of the rotating partition actuator of the present invention is as follows: the control oil pressure pushes the piston rod of the hydraulic motor 6, the piston rod pushes the horizontal connecting rod 7 of the hydraulic motor perpendicular to it, the horizontal connecting rod 7 of the hydraulic motor drives the Y-shaped connecting rod 5, the Y-shaped connecting rod 5 drives the U-shaped connecting rod 4 to rotate. Since the U-shaped connecting rod 4 is fixedly connected to the spline shaft 3.8, and the spline shaft 3.8 and the spline shaft connecting rod 2 are rigidly connected through spline engagement, the U-shaped connecting rod 4, the spline shaft 3.8 and the spline shaft connecting rod 2 can be regarded as a moving component. Therefore, when the horizontal connecting rod 7 of the hydraulic motor drives the Y-shaped connecting rod 5, the U-shaped connecting rod 4, the spline shaft rotation mechanism 3 and the spline shaft connecting rod 2 can be regarded as a lever rotating around the spline shaft 3.8, thereby driving the rotating partition connecting rod 1 to rotate, and finally achieving the purpose of rotating the rotating partition connecting rod 1 to drive the rotating partition 14 to rotate.

[0038] In this embodiment, since the rotation center of the rotating partition and the rotation center of the spline shaft are fixed, the rotation angle β of the spline shaft connecting rod 2 can be drawn using geometric drawing based on the required rotation angle α of the rotating partition 14. When the piston rod of the rotating partition hydraulic motor 6 is fully retracted, the angle between the U-shaped connecting rod 4 and the horizontal line is β / 2 below the horizontal line, and when the piston rod of the rotating partition hydraulic motor 6 is fully extended, the angle between the U-shaped connecting rod 4 and the horizontal line is β / 2 above the horizontal line. Finally, the vertical distance between the centers of the hinge holes of the U-shaped connecting rod 4 and the Y-shaped connecting rod 5 at the two extreme positions can be measured on the geometric diagram when the U-shaped connecting rod 4 rotates by an angle β around the spline shaft 3.8. This distance is the working stroke of the rotating partition hydraulic motor 6. Then, the U-shaped connecting rod 4 is connected and fixed to the spline shaft 3.8, ultimately ensuring that when the rotating partition hydraulic motor 6 drives the U-shaped connecting rod 4 to swing up and down with equal amplitude by an angle β around the horizontal line, the purpose of controlling the rotation angle α of the rotating partition 14 is achieved.

[0039] Example 2 This embodiment provides a turbine rotating diaphragm angle control device, which differs from Embodiment 1 in that, as shown in... Figure 4 and Figure 5As shown, the splined shaft rotation mechanism 3 includes a splined shaft housing 3.1 and a splined shaft 3.8. The splined shaft housing 3.1 is fixedly connected to the lower half of the outer cylinder sidewall of the turbine. The mounting surface of the splined shaft housing 3.1 is tightly fitted with the lower half of the outer cylinder sidewall of the turbine. The left and right ends of the splined shaft housing 3.1 are through structures. The splined shaft 3.8 is installed through the inside of the splined shaft housing 3.1. The splined shaft 3.8 includes a threaded section, a splined section, and a smooth shaft section. The splined section is provided with an external spline. One end of the splined shaft housing 3.1 is sealed by a pressure cap 3.3 and a sealing gasket, and the other end is axially connected by a sliding bearing 3.4, which has a shaft diameter fit with both the splined shaft 3.8 and the splined shaft housing 3.1. The rubber asbestos packing 3.5 and pressure ring 3.7 provide heat insulation and sealing. The smooth section of the spline shaft 3.8 passes through the sliding bearing 3.4, and the external spline on the spline section engages with the internal spline on the spline shaft connecting rod 2. The threaded section is threaded to the spline shaft housing 3.1 near the pressure cap 3.3, thus axially fixing the spline shaft 3.8 and sealing the spline shaft housing 3.1. The bushing is fixed to the sliding bearing 3.4 and the spline shaft housing 3.1 by screws. The rubber asbestos packing 3.5 and pressure ring 3.7 are fixed to the sliding bearing 3.4 by bolts. The spline shaft 3.8 also has a mechanism for adjusting the distance between the inner wall of the spline shaft housing 3.1 and the side of the spline shaft connecting rod 2. An adjusting shim 3.10 for axial clearance; the bushing is fixed to the sliding bearing 3.4 by screws and to the spline shaft housing 3.1 by screws; the rubber asbestos packing 3.5 and the pressure ring 3.7 are fixed to the sliding bearing 3.4 by bolts; the spline shaft 3.8 is also provided with an adjusting shim 3.10 for adjusting the axial clearance between the inner wall of the spline shaft housing 3.1 and the side of the spline shaft connecting rod 2; the smooth section of the spline shaft is insulated and sealed by the sleeve 3.11 and the rubber asbestos gasket 3.12, and the spline shaft is fixed to the sleeve 3.11 by the gasket and the nut; the inner surfaces of the sleeve 3.11 and the sliding bearing 3.4, and the smooth section of the spline shaft on both sides of the spline are nitrided and precision ground. The process not only ensures the precision of the clearance fit but also guarantees long-term wear resistance. The outer cylindrical surfaces of the sleeve 3.11 and the sliding bearing 3.4 transition fit with the inner surface of the spline shaft housing 3.1, ensuring both good concentricity and tightness. Radial vent holes are provided on the pressure cap 3.3 and the spline shaft housing 3.1, with the radial vent holes on the spline shaft housing 3.1 positioned corresponding to the sliding bearing 3.4. A drain vent pipe joint 3.2 is provided at the radial vent holes to promptly drain water and vent steam when there is abnormal steam leakage in the spline shaft rotation mechanism 3. The end cap 3.9 is provided on the broken side of the optical axis of the spline shaft 3.8 to protect the spline shaft 3.8.

[0040] In this embodiment, the spline shaft rotation mechanism 3 has excellent sealing performance. The spline shaft connecting rod 2 and the U-shaped connecting rod 4 are connected to the spline shaft in the spline shaft rotation mechanism 3 to form a moving component. The spline shaft 3.8 and the spline shaft housing 3.1 are designed with precise diameter fit with the sleeve 3.11 and the sliding bearing 3.4 to ensure long-term sealing and wear resistance. The two ends of the spline shaft housing 3.1 are reliably sealed to the outside environment through the pressure cap 3.3, sealing gasket, rubber asbestos gasket 3.12, rubber asbestos packing 3.5, pressure ring 3.7, and screw plug, thus completely isolating the trace amounts of high-temperature steam that may leak through the gap in the spline shaft 3.8 from the normal temperature environment. Water and steam are promptly drained and discharged through the condensate drain pipe joint 3.2. This ensures both the reliability and strength of the connection and good sealing performance, effectively preventing steam leakage through the spline shaft 3.8.

[0041] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A turbine rotating diaphragm angle control device, comprising a hydraulic actuator (6) and a rotating diaphragm (14), characterized in that: The hydraulic actuator is connected to the lower half of the outer cylinder wall of the steam turbine via a connecting bracket (8). The hydraulic actuator includes a piston rod, a horizontal connecting rod (7), and a guide rod (9). The piston rod has a threaded top end, and the horizontal connecting rod (7) has a through hole in the middle. The piston rod passes through the through hole and is vertically connected to the horizontal connecting rod (7). The piston rod is threaded at the top end and connected to the guide rod (9), which guides the piston rod. The horizontal connecting rod (7) has square holes at both ends, and each square hole is connected to a Y-shaped connecting rod (5). The top ends of the two Y-shaped connecting rods (5) are connected to the hydraulic actuator. The horizontal connecting rod (7) is hinged, and the bottom ends of the two Y-shaped connecting rods (5) are respectively hinged to one end of the U-shaped connecting rod (4). The other end of the U-shaped connecting rod (4) is fixedly connected to the spline shaft rotating mechanism (3). The spline shaft rotating mechanism (3) is fixedly connected to one end of the spline shaft connecting rod (2) through spline fit. The other end of the spline shaft connecting rod (2) is hinged to one end of the rotating partition connecting rod (1). The other end of the rotating partition connecting rod (1) is hinged to the rotating partition (14). The spline shaft rotating mechanism (3) is connected to the spline shaft connecting rod (2) and the U-shaped connecting rod (4) to form a component with no relative motion relationship. The connecting bracket (8) is equipped with a cooler (10).

2. The angle control device according to claim 1, characterized in that: The cooler (10) includes a cooling device, a cooler shell, a cooler inlet (12), and a cooler outlet (11). The cooling device is a rectangular integrated structure with multiple corrugated flow channel plates fixedly connected. The cooler shell is a hollow sealed rectangular shell. The cooling device is installed inside the cooler shell, and the outer side of the cooling device is attached to and fixedly connected to the inner side of the cooler shell. The cooler inlet (12) is located at the lower part of one side of the shell, and the cooler outlet (11) is located at the upper part of the other side of the shell. Each corrugated flow channel plate of the cooler (10) is designed with a flow hole. The flow hole is located near the shell in the length direction of the corrugated flow channel plate, and the flow holes on adjacent corrugated flow channel plates are staggered vertically.

3. The angle control device according to claim 1, characterized in that: The upper and lower ends of the Y-shaped connecting rod (5) are connected to the horizontal connecting rod (7) and the U-shaped connecting rod (4) of the hydraulic motor respectively via pins and radial spherical bearings (13).

4. The angle control device according to claim 1, characterized in that: The spline shaft rotation mechanism (3) includes a spline shaft housing (3.1) and a spline shaft (3.8). The spline shaft housing (3.1) is fixedly connected to the lower half of the outer cylinder sidewall of the steam turbine. The mounting surface of the spline shaft housing (3.1) is in close contact with the lower half of the outer cylinder sidewall of the steam turbine. The left and right ends of the spline shaft housing (3.1) are through structures. The spline shaft (3.8) is installed through inside the spline shaft housing (3.1). The spline shaft (3.8) includes a threaded section, a spline section, and a smooth shaft section. An external spline is provided on the spline section. 1) One end is sealed by a pressure cap (3.3) and a sealing gasket, and the other end is insulated and sealed by a sliding bearing (3.4) that has a diameter matching relationship with both the spline shaft (3.8) and the spline shaft housing (3.1), a rubber asbestos packing (3.5) that provides axial sealing, and a pressure ring (3.7). The smooth shaft section of the spline shaft (3.8) passes through the sliding bearing (3.4), and the external spline on the spline section is connected to the internal spline on the spline shaft connecting rod (2). The threaded section is threaded to the spline shaft housing (3.1) on the side near the pressure cap (3.3).

5. The angle control device according to claim 4, characterized in that: The bushing is fixed to the sliding bearing (3.4) by screws and to the splined shaft housing (3.1) by screws. The rubber asbestos packing (3.5) and the pressure ring (3.7) are fixed to the sliding bearing (3.4) by bolts.

6. The angle control device according to claim 4, characterized in that: The splined shaft (3.8) is also provided with an adjusting washer (3.10) for adjusting the axial clearance between the inner wall of the splined shaft housing (3.1) and the side of the splined shaft connecting rod (2).

7. The angle control device according to claim 4, characterized in that: The optical section of the spline shaft (3.8) is insulated and sealed by a sleeve (3.11) and a rubber asbestos gasket (3.12), and the spline shaft (3.8) is fixed to the sleeve (3.11) by a gasket and a nut.

8. The angle control device according to claim 7, characterized in that: The outer cylindrical surfaces of the sleeve (3.11) and the sliding bearing (3.4) are transitionally fitted with the inner surface of the spline shaft housing (3.1).

9. The angle control device according to claim 4, characterized in that: Radial vent holes are provided on the gland (3.3) and the spline shaft housing (3.1), respectively. The radial vent holes on the spline shaft housing (3.1) are located at positions corresponding to the sliding bearing (3.4), and a condensate vent pipe joint (3.2) is provided at the radial vent holes.

10. The angle control device according to claim 4, characterized in that: The end face of the optical axis of the spline shaft (3.8) is provided with an end cap (3.9) to protect the spline shaft (3.8).

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