A gas turbine compressor variable guide vane actuator

Abstract

The application discloses a gas turbine compressor variable guide vane actuator, and relates to the technical field of gas turbines. The gas turbine compressor variable guide vane actuator is installed on a casing of a compressor and comprises a variable guide vane and a linkage ring, and further comprises a hydraulic swing cylinder, a gear transmission mechanism, a normal face gear transmission mechanism and a closed-loop control system. The hydraulic swing cylinder comprises a shaft sleeve capable of rotating around an axis of the shaft sleeve, and a first encoder is arranged at the shaft sleeve to collect a rotation angle signal. The gear transmission mechanism comprises a rotating shaft assembly, the shaft sleeve is in transmission connection with the rotating shaft assembly, and a sector gear is arranged on the rotating shaft assembly. The closed-loop control system automatically adjusts the installation angle of the gas turbine compressor variable guide vane according to an instruction, and the technical problems of more parts, larger installation space, poor transmission movement precision, low control precision, poor reliability and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, specifically to a rotatable guide vane actuator for a gas turbine compressor. Background Technology

[0002] Most gas turbine compressor components employ multi-stage compressors with high pressure ratios. To improve the surge margin of multi-stage compressors under all operating conditions, three effective methods are commonly used: rotatable guide vanes, intermediate stage bleed-out, and anti-surge casing. Among these, rotatable guide vane technology is currently the most widely used method for preventing surge and improving compressor performance in multi-stage gas turbine compressors. However, since the rotation angle of each rotatable guide vane is different, a linkage device for the multi-stage rotatable guide vanes needs to be designed to enable coordinated operation and simplify the overall motion mechanism.

[0003] For example, the rotating mechanism of the rotatable guide vane of a gas turbine compressor disclosed in Chinese Patent Publication No. CN114320615A is composed of three mechanisms: a slider mechanism, a crank-slider mechanism, and a tangent mechanism. The slider mechanism is used as the driving mechanism of the rotating mechanism of the rotatable guide vane of the compressor, and the tangent mechanism is used as the driven mechanism of the rotating mechanism of the rotatable guide vane of the compressor.

[0004] Because this type of rotatable guide vane mechanism has many components, and because the actuator contains four variables—the linear displacement of the pneumatic actuator, the rotation angle of the second screw, the rotation angle of the linkage ring, and the rotation angle of the rotatable guide vane—and the motion law of the rotatable guide vane is a trigonometric function with three variables, and because it lacks a piston position sensor and pointer angle measuring element for the pneumatic actuator and employs an open-loop control system, it is difficult to predict whether the installation angle of the rotatable guide vane has reached the optimal value. Therefore, this type of rotatable guide vane mechanism for gas turbine compressors has drawbacks such as complex mechanism, numerous moving parts, large installation space, poor motion transmission accuracy, and poor control accuracy. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rotatable guide vane actuator for a gas turbine compressor, which is installed on the compressor casing. It includes a rotatable guide vane and a linkage ring, as well as a hydraulic swing cylinder, a gear transmission mechanism, an orthogonal plane gear transmission mechanism, and a closed-loop control system. The hydraulic swing cylinder includes a bushing that can rotate around its own axis, and a first encoder for acquiring rotation angle signals is provided at the bushing. The gear transmission mechanism includes a rotating shaft assembly, the bushing is connected to the rotating shaft assembly in a transmission connection, a sector gear is provided on the rotating shaft assembly, an external sector gear is provided on the outer periphery of the linkage ring, the sector gear meshes with the external sector gear, and the linkage ring can rotate circumferentially around the axis of the compressor. The orthogonal surface gear transmission mechanism includes a rotating arm, a surface gear is provided on the axial end face of the linkage ring, a gear is provided on the rotating arm, the surface gear and the gear are orthogonally meshed, and the rotating arm is rigidly connected to the rotating shaft of the rotatable guide vane. Each stage of the rotatable guide vane is provided with at least one second encoder for collecting installation angle signals. Both the first encoder and the second encoder are connected to the closed-loop control system signal to form a closed-loop adjustment loop for the installation angle of the rotatable guide vane.

[0006] Preferably, the hydraulic swing cylinder includes a cylinder body, a stator, a rotor, a support plate, and a cover plate. The cylinder body is fixedly installed on the outer wall of the compressor casing. The cylinder body sidewall has a first oil port and a second oil port. The stator is fixed to the inner wall of the cylinder body by a first bolt, forming a fixed partition component for the oil chamber. The rotor is fixed to the outer wall of the bushing by a second bolt and rotates synchronously with the bushing. The stator and rotor divide the internal space of the cylinder body into a first oil chamber and a second oil chamber that are not interconnected. The first oil port on the sidewall of the cylinder body is connected to the first oil chamber, and the second oil port is connected to the second oil chamber. The first oil port and the second oil port are respectively connected to the corresponding oil chamber for connecting hydraulic oil to drive the rotor to swing. The two ends of the bushing are respectively radially supported inside the cylinder body by the support plate to ensure the coaxiality of the bushing rotation. The cover plate is installed on the outside of the support plate to form an end-closed structure. The cylinder body, the support plate, and the cover plate are fastened together by a third bolt. The cylinder body is provided with mounting holes for fixed installation, and the cylinder body is fixedly installed on the outer wall of the compressor casing through the mounting holes.

[0007] Preferably, sealing rings are embedded between the mating contact surfaces of the stator, cylinder body, and bushing, forming the main sealing system of the oil chamber. This system separates the high and low pressure oil chambers, prevents internal oil leakage, and ensures stable oil chamber pressure to maintain the torque and angular accuracy of the swing output. Sealing rings are also embedded between the mating contact surfaces of the rotor, cylinder body, and bushing. A sealing element is provided between the support plate and the cover plate to form an auxiliary end seal, preventing leaked oil from overflowing and polluting the equipment environment. A small oil return hole is provided directly below the sealing ring and the support plate, and an oil drain port is provided on the cover plate. Leaking hydraulic oil can flow back to the oil tank through the small oil return hole and the oil drain port via an external pipeline, preventing oil accumulation from affecting the operation of the support components or seeping into surrounding electrical components and causing malfunctions. Thus, the multi-seal and directional oil return connection structure of this application significantly improves the operational reliability and service life of the hydraulic swing cylinder while ensuring transmission accuracy.

[0008] Preferably, the rotating shaft assembly includes a rotating shaft, bearings, and supports. The bushing is rigidly connected to the rotating shaft via a spline structure to synchronously transmit torque. The sector gears are fixedly mounted on the rotating shaft. Both ends of the rotating shaft are rotatably supported by bearings and supports, which are fixedly mounted on the outer wall of the compressor casing. Thus, the swing torque output by the hydraulic swing cylinder is precisely transmitted to the rotating shaft through the spline structure. The rotating shaft drives all the sector gears on it to swing synchronously, providing synchronous power input to each stage of the linkage.

[0009] Preferably, the linkage ring is assembled into a circular ring by two linkage half-rings, rollers, pins and connectors. The sector external gear and the face gear are both set on the linkage half-rings. A number of rollers are evenly distributed on the inner circumference of the linkage ring. The outer surface of the compressor casing is provided with a circular track. The rollers are embedded in the track and can roll along the track circumferentially to constrain the linkage ring to rotate around the compressor axis.

[0010] Preferably, the number of sector gears corresponds to the number of stages of rotatable guide vanes, and the sector gears are fixedly distributed at intervals along the axial direction of the rotating shaft, so that a single rotating shaft can simultaneously carry drive gears of multiple stages of transmission.

[0011] Preferably, the linkage rings correspond to the number of stages of the rotatable guide vanes. The linkage rings are arranged side by side at intervals along the axial direction of the compressor. The linkage rings mesh with the sector gears of the corresponding stages for transmission. The oscillation input of a single rotating shaft is transmitted to the linkage rings of the corresponding stages through the sector gears of each stage, which is converted into the circumferential rotation of the multi-stage linkage rings, and finally drives the rotatable guide vanes of each stage to complete the angle adjustment synchronously.

[0012] Preferably, the number of rotating arms configured corresponding to the rotatable guide vane corresponds to the number of blades of the rotatable guide vane. The rotating arms are evenly distributed along the circumference of the compressor. The motion law of the rotatable guide vane is a linear relationship with the rotation angle of the hydraulic swing cylinder as the variable. By comparing the rotation angle values ​​measured by the first encoder and the second encoder, the control accuracy of the swing angle of the rotatable guide vane can be better improved.

[0013] Preferably, at least one hydraulic swing cylinder and shaft assembly are provided.

[0014] Preferably, the pitch circle diameters of the sector gear and the face gear are set based on the rotation angle requirements of the rotatable guide vane.

[0015] Beneficial effects This invention provides a rotatable guide vane actuator for a gas turbine compressor, which has the following advantages: By combining a gear transmission mechanism and an orthogonal surface gear transmission mechanism, with a hydraulic swing cylinder as the driving component and a rotating arm as the driven component, the hydraulic swing cylinder's bushing swings, driving the linkage ring through the meshing of a sector gear and a sector external gear. The motion is then transmitted through the meshing of a surface gear on the linkage ring and a gear on the rotating arm, causing the rotatable guide vane to rotate. A closed-loop control system issues commands to automatically adjust the installation angle of the gas turbine compressor's rotatable guide vane, solving technical problems such as numerous components, large installation space, poor motion transmission accuracy, low control accuracy, and poor reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the invention mounted on the casing; Figure 2 for Figure 1 AA section view in the middle; Figure 3 for Figure 1 Enlarged view of section I in the middle; Figure 4 This is a cross-sectional view of the hydraulic swing cylinder BB in this invention; Figure 5 for Figure 4 CC section view; Figure 6 for Figure 2 DD section view in the image.

[0017] In the diagram: 1. Compressor; 5. Hydraulic swing cylinder; 6. Rotary shaft assembly; 7. Sector gear; 8. Linkage ring; 9. First encoder; 10. Bushing; 11. Rotating shaft; 12. Sector external gear; 13. Bearing and support; 14. Linkage half ring; 15. Connecting piece; 16. Roller; 17. Pin; 19. Rotating arm; 20. Rotatable guide vane; 21. Second encoder; 22. Cylinder body; 23. Stator; 24. Rotor; 25. Support plate; 26. Cover plate; 27. Sealing ring; 28. Seal; 29. ​​Oil return hole; 30. First oil port; 31. Second oil port; 32. Oil drain port; 34. First bolt; 35. Second bolt; 36. Third bolt; 38. Mounting hole; 40. Track; 41. First oil chamber; 42. Second oil chamber; 48. Gear; 49. Face gear; 50. Closed-loop control system. Detailed Implementation

[0018] The present invention will now be further described with reference to the accompanying drawings.

[0019] Please see Figure 1-5The present invention provides a rotatable guide vane actuator for a gas turbine compressor, which is installed on the casing of the compressor 1. It includes a rotatable guide vane 20 and a linkage ring 8, and also includes a hydraulic swing cylinder 5, a gear transmission mechanism, an orthogonal plane gear transmission mechanism and a closed-loop control system 50. The hydraulic swing cylinder 5 includes a bushing 10 that can rotate around its own axis, and a first encoder 9 for acquiring rotation angle signals is provided at the bushing 10; The gear transmission mechanism includes a rotating shaft assembly 6, a bushing 10 that is connected to the rotating shaft assembly 6, a sector gear 7 that is provided on the rotating shaft assembly 6, and a sector external gear 12 that is provided on the outer periphery of the linkage ring 8. The sector gear 7 and the sector external gear 12 mesh with each other, and the linkage ring 8 can rotate circumferentially around the axis of the compressor 1. The orthogonal surface gear transmission mechanism includes a rotating arm 19, a surface gear 49 is provided on the axial end face of the linkage ring 8, a gear 48 is provided on the rotating arm 19, the surface gear 49 and the gear 48 are orthogonally meshed, and the rotating arm 19 is rigidly connected to the rotating shaft of the rotatable guide vane 20. At least one second encoder 21 is provided on each stage of the rotatable guide vane 20 for collecting the installation angle signal. Both the first encoder 9 and the second encoder 21 are connected to the closed-loop control system 50 to form a closed-loop adjustment loop for the installation angle of the rotatable guide vane 20.

[0020] Preferably, the first encoder 9 collects the input angle signal of the bushing 10, the rotating shaft assembly 6 receives the power of the bushing 10 and transmits it axially, the sector gear 7 meshes with the sector external gear 12 on the outer periphery of the linkage ring 8 to form a gear transmission mechanism, converting the oscillation around the axis of the rotating shaft into the circumferential rotation of the linkage ring 8 around the axis of the compressor 1; and the face gear 49 on the end face of the linkage ring 8 orthogonally meshes with the gear 48 on the rotating arm 19 to form an orthogonal face gear transmission mechanism, converting the circumferential rotation of the linkage ring 8 into the deflection of the rotating arm 19 around its own axis, thereby driving the rotatable guide vane 20 to rotate synchronously to adjust the installation angle. The second encoder 21 configured on each stage of the rotatable guide vane 20 collects the output signal of the actual installation angle of the guide vane, and transmits it together with the signal of the first encoder 9 to the closed-loop control system 50, forming a closed-loop adjustment loop with input and output dual feedback.

[0021] Thus, the power of this application is transmitted step by step along the path of hydraulic swing cylinder 5, gear transmission mechanism, orthogonal plane gear transmission mechanism, and rotatable guide vane 20. The dual encoders monitor the angle of the power input end and the execution output end respectively, and the transmission error is corrected by the closed-loop control system 50.

[0022] The hydraulic swing cylinder 5 includes a cylinder body 22, a stator 23, a rotor 24, a support plate 25, and a cover plate 26. The cylinder body 22 is fixedly installed on the outer wall of the compressor casing 1. The side wall of the cylinder body 22 has a first oil port 30 and a second oil port 31. The stator 23 is fixed to the inner wall of the cylinder body 22 by a first bolt 34, forming a fixed partition component for the oil chamber. The rotor 24 is fixed to the outer wall of the bushing 10 by a second bolt 35 and rotates synchronously with the bushing 10. The stator 23 and the rotor 24 divide the internal space of the cylinder body 22 into a first oil chamber 41 and a second oil chamber 42 that are not interconnected. The first oil port 30 on the side wall is connected to the first oil chamber 41, and the second oil port 31 is connected to the second oil chamber 42. The first oil port 30 and the second oil port 31 are respectively connected to the corresponding oil chambers for connecting hydraulic oil to drive the rotor 24 to swing. The two ends of the bushing 10 are respectively radially supported inside the cylinder body 22 by the support plate 25 to ensure the rotational coaxiality of the bushing 10. The cover plate 26 is installed on the outside of the support plate 25 to form an end-closed structure. The cylinder body 22, the support plate 25 and the cover plate 26 are fastened together by the third bolt 36. The cylinder body 22 is provided with mounting holes 38 for fixed installation, and the cylinder body 22 is fixedly installed on the outer wall of the compressor 1 casing through the mounting holes 38.

[0023] Sealing rings 27 are embedded between the mating contact surfaces of the stator 23, cylinder body 22, and bushing 10, forming the main sealing system of the oil chamber. This system separates the high and low pressure oil chambers, prevents internal leakage of oil, and ensures stable oil chamber pressure to maintain the torque and angle accuracy of the swing output. Sealing rings 27 are also embedded between the mating contact surfaces of the rotor 24, cylinder body 22, and bushing 10. A sealing element 28 is provided between the support plate 25 and the cover plate 26 to form an auxiliary end seal, preventing leaked oil from overflowing and polluting the equipment environment. A small oil return hole 29 is provided directly below the sealing ring 27 and the support plate 25, and an oil drain port 32 is provided on the cover plate 26. The hydraulic oil leaking from the oil chamber can flow back to the oil tank through the small oil return hole 29 and the oil drain port 32 via an external pipeline, preventing oil accumulation from affecting the operation of the support components or seeping into surrounding electrical components and causing malfunctions. Thus, the multi-seal and directional oil return connection structure of this application significantly improves the operational reliability and service life of the hydraulic swing cylinder 5 while ensuring transmission accuracy.

[0024] The rotating shaft assembly 6 includes a rotating shaft 11 and bearings and supports 13. The bushing 10 is rigidly connected to the rotating shaft 11 via a spline structure to synchronously transmit torque. The sector gears 7 are fixedly mounted on the rotating shaft 11. Both ends of the rotating shaft 11 are rotatably supported by bearings and supports 13, which are fixedly mounted on the outer wall of the compressor casing 1. Thus, the swing torque output by the hydraulic swing cylinder 5 is precisely transmitted to the rotating shaft 11 through the spline structure. The rotating shaft 11 drives all the sector gears 7 on it to swing synchronously, providing synchronous power input to each stage of the linkage ring 8.

[0025] The linkage ring 8 is assembled into a circular ring by two linkage half-rings 14, rollers 16, pins 17 and connectors 15. The sector external gear 12 and the face gear 49 are both set on the linkage half-rings 14. Several rollers 16 are evenly distributed on the inner circumference of the linkage ring 8. The outer surface of the compressor 1 casing is provided with a circular track 40. The rollers 16 are embedded in the track 40 and can roll along the track 40 to constrain the linkage ring 8 to rotate around the axis of the compressor 1.

[0026] When sector gear 7 drives sector external gear 12, linkage ring 8 rotates smoothly in the circumferential direction under the support of roller 16 and the constraint of track 40, evenly distributing the power input from a single point to the rotating arm 19 arranged in the entire circumferential direction; the cooperation between roller 16 and track 40 converts sliding friction into rolling friction, reducing motion resistance and component wear, while precisely constraining the motion trajectory of linkage ring 8, ensuring the consistency of angle adjustment of all rotatable guide vanes 20 in the entire stage.

[0027] The number of sector gears 7 corresponds to the number of stages of the rotatable guide vanes 20. The sector gears 7 are fixedly distributed along the axial direction of the rotating shaft 11, so that a single rotating shaft 11 can simultaneously carry drive gears of multiple stages of transmission.

[0028] The linkage ring 8 corresponds to the number of stages of the rotatable guide vane 20. The linkage ring 8 is distributed side by side at intervals along the axial direction of the compressor 1. The linkage ring 8 meshes with the sector gear 7 of the corresponding stage for transmission. The oscillation input of a single rotating shaft 11 is transmitted to the linkage ring 8 of the corresponding stage through the sector gear 7 of each stage, which is converted into the circumferential rotation of the multi-stage linkage ring 8, and finally drives the rotatable guide vane 20 of each stage to complete the angle adjustment synchronously.

[0029] The number of rotating arms 19 configured corresponding to the rotatable guide vane 20 corresponds to the number of blades of the rotatable guide vane 20, and the rotating arms 19 are evenly distributed along the circumference of the compressor 1.

[0030] At least one hydraulic swing cylinder 5 and a rotating shaft assembly 6 are provided.

[0031] The pitch circle diameters of sector gear 7 and face gear 49 are set based on the rotation angle requirements of rotatable guide vane 20.

Claims

1. A rotatable guide vane actuator for a gas turbine compressor, mounted on the casing of a compressor (1), comprising a rotatable guide vane (20) and a linkage ring (8), characterized in that: It also includes a hydraulic swing cylinder (5), a gear transmission mechanism, an orthogonal plane gear transmission mechanism, and a closed-loop control system (50). The hydraulic swing cylinder (5) includes a bushing (10) that can rotate around its own axis, and a first encoder (9) for collecting rotation angle signals is provided at the bushing (10). The gear transmission mechanism includes a rotating shaft assembly (6), the bushing (10) is connected to the rotating shaft assembly (6) in a transmission connection, the rotating shaft assembly (6) is provided with a sector gear (7), the outer periphery of the linkage ring (8) is provided with a sector external gear (12), the sector gear (7) meshes with the sector external gear (12), and the linkage ring (8) can rotate circumferentially around the axis of the compressor (1); The orthogonal surface gear transmission mechanism includes a rotating arm (19), a face gear (49) is provided on the axial end face of the linkage ring (8), a gear (48) is provided on the rotating arm (19), the face gear (49) and the gear (48) are orthogonally meshed, and the rotating arm (19) is rigidly connected to the rotating shaft of the rotatable guide vane (20). At least one second encoder (21) is provided on each of the rotatable guide vanes (20) for collecting installation angle signals. Both the first encoder (9) and the second encoder (21) are connected to the closed-loop control system (50) to form a closed-loop adjustment loop for the installation angle of the rotatable guide vane.

2. The rotatable guide vane actuator for a gas turbine compressor according to claim 1, characterized in that: The hydraulic swing cylinder (5) includes a cylinder body (22), a stator (23), a rotor (24), a support plate (25), and a cover plate (26). The cylinder body (22) is fixedly installed on the outer wall of the compressor (1) casing. The side wall of the cylinder body (22) has a first oil port (30) and a second oil port (31). The stator (23) is fixed to the inner wall of the cylinder body (22) by a first bolt (34). The rotor (24) is fixed to the outer wall of the bushing (10) by a second bolt (35). The stator (23) and the rotor (24) are connected. 24) The internal space of the cylinder body (22) is divided into a first oil chamber (41) and a second oil chamber (42). The first oil port (30) is connected to the first oil chamber (41), and the second oil port (31) is connected to the second oil chamber (42). The two ends of the bushing (10) are radially supported inside the cylinder body (22) by the support plate (25). The cover plate (26) is installed on the outside of the support plate (25). The cylinder body (22), the support plate (25) and the cover plate (26) are fastened together by the third bolt (36). The cylinder body (22) is provided with mounting holes (38) for fixed installation, and the cylinder body (22) is fixedly installed on the outer wall of the compressor (1) casing through the mounting holes (38).

3. The rotatable guide vane actuator for a gas turbine compressor according to claim 2, characterized in that: A sealing ring (27) is embedded between the mating contact surfaces of the stator (23) and the cylinder (22) and the bushing (10). A sealing ring (27) is embedded between the mating contact surfaces of the rotor (24) and the cylinder (22) and the bushing (10). A sealing element (28) is provided between the support plate (25) and the cover plate (26). A small oil return hole (29) is opened directly below the sealing ring (27) and the support plate (25). An oil drain port (32) is opened on the cover plate (26).

4. The rotatable guide vane actuator for a gas turbine compressor according to claim 1, characterized in that: The rotating shaft assembly (6) includes a rotating shaft (11) and bearings and supports (13). The bushing (10) is rigidly connected to the rotating shaft (11) through a spline structure to transmit torque synchronously. The sector gear (7) is fixedly installed on the rotating shaft (11). The two ends of the rotating shaft (11) are rotatably supported by bearings and supports (13) respectively. The bearings and supports (13) are fixedly installed on the outer wall of the compressor (1) casing.

5. The rotatable guide vane actuator for a gas turbine compressor according to claim 1, characterized in that: The linkage ring (8) is assembled into a circular ring by two linkage half-rings (14), rollers (16), pins (17) and connectors (15). The sector external gear (12) and the face gear (49) are both set on the linkage half-ring (14). Several rollers (16) are evenly distributed on the inner circumference of the linkage ring (8). The outer surface of the compressor (1) casing is provided with a circular track (40). The rollers (16) are embedded in the track (40) and can roll along the track (40) circumferentially.

6. The rotatable guide vane actuator for a gas turbine compressor according to claim 4, characterized in that: The number of sector gears (7) corresponds to the number of stages of the rotatable guide vanes (20), and the sector gears (7) are fixedly distributed at intervals along the axial direction of the rotating shaft (11).

7. The rotatable guide vane actuator for a gas turbine compressor according to claim 5, characterized in that: The linkage ring (8) corresponds to the stage of the rotatable guide vane (20). The linkage ring (8) is distributed side by side at intervals along the axial direction of the compressor (1). The linkage ring (8) meshes with the sector gear (7) of the corresponding stage for transmission.

8. The rotatable guide vane actuator for a gas turbine compressor according to claim 1, characterized in that: The number of rotating arms (19) configured corresponding to the rotatable guide vane (20) corresponds to the number of blades of the rotatable guide vane (20). The rotating arms (19) are evenly distributed along the circumference of the compressor (1). The motion law of the rotatable guide vane (20) is a linear relationship with the rotation angle of the hydraulic swing cylinder (5) as the variable. By comparing the rotation angle values ​​measured by the first encoder (9) and the second encoder (21), the control accuracy of the swing angle of the rotatable guide vane (20) can be better improved.

9. The rotatable guide vane actuator for a gas turbine compressor according to claim 1, characterized in that: At least one of the hydraulic swing cylinder (5) and the rotating shaft assembly (6) is provided.

10. The rotatable guide vane actuator for a gas turbine compressor according to claim 1, characterized in that: The pitch circle diameters of the sector gear (7) and the face gear (49) are set based on the rotation angle requirements of the rotatable guide vane (20).

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