CN109764012B

CN109764012B - Hydraulic actuating mechanism and gas turbine

Info

Publication number: CN109764012B
Application number: CN201910168285.2A
Authority: CN
Inventors: 刘政委; 王伟; 张栋芳; 谈芦益; 唐健; 程雁菁; 彭运洪; 刘冰
Original assignee: Shanghai Electric Gas Turbine Co ltd
Current assignee: Shanghai Electric Gas Turbine Co ltd
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2024-05-07
Anticipated expiration: 2039-03-06
Also published as: CN109764012A

Abstract

The application provides a hydraulic actuating mechanism and a gas turbine, wherein the hydraulic actuating mechanism comprises an oil cylinder, a stroke adjusting device and a connecting piece acting on an air inlet guide vane of a gas compressor, the oil cylinder is provided with a cylinder body, a telescopic piston rod, a front end cover and a rear end cover which are fixed at two ends of the cylinder body, and a limiting ring which is fixed at the rear end of the piston rod and is positioned outside the cylinder body, the connecting piece is fixed at the front end of the piston rod and is positioned outside the cylinder body, the stroke adjusting device is provided with a front limiting piece capable of being abutted with the connecting piece and a rear limiting piece capable of being abutted with the limiting ring, the front limiting piece is installed on the front end cover and the installation position of the front limiting piece is adjustable, and the rear limiting piece is installed on the rear end cover and the installation position of the rear limiting piece is adjustable. According to the application, the stroke control and online adjustment of the hydraulic actuating mechanism are realized through the stroke adjusting device, the flexibility is good, the specific design requirements and the opening interval of the air inlet guide vane of the air compressor can be met, and meanwhile, the safety of the air inlet guide vane of the air compressor is ensured by providing mechanical limit.

Description

Hydraulic actuating mechanism and gas turbine

Technical Field

The invention relates to the field of gas turbines, in particular to a hydraulic actuating mechanism acting on an air inlet guide vane of a compressor in a gas turbine.

Background

The gas turbine mainly comprises a gas compressor, a combustion chamber and a turbine; air is compressed in the air compressor, and the high-temperature and high-pressure air generated by the air is mixed with fuel in the combustion chamber for combustion, and the high-temperature and high-pressure flue gas generated by combustion expands in the turbine for acting so as to enable the gas turbine to rotate at a high speed. The air inlet angle of an air inlet guide vane (Inlet Guide Vane, IGV for short) of a compressor in the gas turbine directly influences the air quantity entering the compressor, different air inlet guide vane air inlet angles correspond to different air inlet amounts of the compressor, and different air inlet amounts of the compressor play an important role in the aspects of starting and exhaust temperature control of the gas turbine. At present, the air inlet angle of the air inlet guide vane of the air compressor is controlled by a hydraulic actuating mechanism, and the function is included in the core closed-loop control function of the gas turbine, so the hydraulic actuating mechanism of the air inlet guide vane of the air compressor is one of core equipment of the closed-loop control of the gas turbine.

Further, the mechanical structure of the compressor inlet guide vane requires the hydraulic actuator to provide a large driving force, but does not allow for rapid action; in addition, in order to ensure the safe operation of the gas turbine, a hydraulic actuating mechanism matched with an air inlet guide vane of the gas compressor needs to ensure the function of slow closing of faults; in addition, the working stroke of the hydraulic actuator can be matched with the opening interval of the air inlet guide vane of the compressor. The hydraulic actuators currently on the market for conventional valves obviously do not meet the above requirements.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a hydraulic actuator adapted to control the inlet angle of the inlet guide vanes of a compressor.

The invention provides a hydraulic actuating mechanism, which comprises an oil cylinder, a stroke adjusting device and a connecting piece acting on an air inlet guide vane of a compressor, wherein the oil cylinder is provided with a cylinder body, a telescopic piston rod, a front end cover and a rear end cover which are fixed at two ends of the cylinder body, and a limiting ring which is fixed at the rear end of the piston rod and is positioned outside the cylinder body, the connecting piece is fixed at the front end of the piston rod and is positioned outside the cylinder body, the stroke adjusting device is provided with a front limiting piece capable of being abutted with the connecting piece and a rear limiting piece capable of being abutted with the limiting ring, the front limiting piece is mounted on the front end cover and is adjustable in front and back at the mounting position, and the rear limiting piece is mounted on the rear end cover and is adjustable in front and back at the mounting position.

Further, the front end of the front end cover is provided with a front connecting shaft part extending forwards, and the front limiting piece is in threaded connection with the periphery of the front connecting shaft part and is locked between the front connecting shaft part and the front connecting shaft part through a screw; the rear end of the rear end cover is provided with a rear connecting shaft part extending backwards, and the rear limiting part is in threaded connection with the periphery of the rear connecting shaft part and is locked between the rear connecting shaft part and the rear connecting shaft part through a screw.

Further, the hydraulic actuating mechanism further comprises an anti-rotation device, the anti-rotation device comprises a connecting block fixed on the connecting piece, a guide rod extending back and forth along the telescopic direction of the piston rod, and a guide hole formed in the front end cover, the guide rod is matched with the guide hole, and the guide rod is fixed with the connecting block.

Further, the hydraulic actuating mechanism is also matched with a control system, a control oil way, a control valve group with a plurality of control valves and a displacement sensor, wherein the displacement sensor extends into the rear section of the piston rod, the plurality of control valves and the displacement sensor are connected with the control system, and the control valve group is arranged in the control oil way; the cylinder is also provided with a piston which is fixed with the piston rod and is in sliding fit with the inner wall of the cylinder body, the cylinder body is internally provided with a first oil cavity between the piston and the front end cover and a second oil cavity between the piston and the rear end cover, and the first oil cavity and the second oil cavity are connected with the control oil circuit.

Further, the control oil paths are provided with an oil supply port and an oil return port, the P port of the servo valve, the P port of the fail-safe valve, the X port of the servo valve and the P port of the electromagnetic valve are all connected with the oil supply port, the A port and the B port of the servo valve are all connected with the oil port of the fail-safe valve, the B port of the fail-safe valve is connected with the first oil cavity of the oil cylinder, the A port of the fail-safe valve is connected with the second oil cavity of the oil cylinder, the A port of the electromagnetic valve is connected with the driving port of the fail-safe valve, and the T port of the servo valve, the T port of the fail-safe valve and the T port of the electromagnetic valve are all connected with the oil return port.

Further, the control valve group further comprises a pressure switch, the pressure switch is connected with an A port of the electromagnetic valve, and the pressure switch is connected with the control system.

Further, the control oil way comprises a main oil supply pipeline, a first oil distribution pipeline and a second oil distribution pipeline, one end of the main oil supply pipeline is connected with the oil supply port, the other end of the main oil supply pipeline is connected with one end of the first oil distribution pipeline and one end of the second oil distribution pipeline, the other end of the first oil distribution pipeline is respectively connected with a P port of the servo valve and a P port of the fault safety valve, and the other end of the second oil distribution pipeline is respectively connected with an X port of the servo valve and a P port of the electromagnetic valve; the main oil supply pipeline is connected with a high-pressure filter; the plurality of control valves further includes a check valve connected to the first distribution pipeline.

Further, the hydraulic actuating mechanism further comprises a sensor protection device, the sensor protection device comprises a fixing flange, a fixing rod, a protection tube and a protection box, the rear end cover and the fixing flange are arranged front and back, the front end and the rear end of the fixing rod are respectively fixed on the rear end cover and the fixing flange, the protection tube is sleeved on the periphery of the rear section of the piston rod, the front end and the rear end of the protection tube are respectively sleeved on the rear limiting part and the fixing flange, and the protection box covers the outside of the sensor and is fixed on the fixing flange.

Further, a travel switch for monitoring the displacement of the piston rod is also arranged on the fixed rod, and the travel switch is connected with a control system; the travel switch is arranged on the fixed rod, and a detection notch is formed in the travel switch on the protection tube; when the limit ring at the rear end of the piston rod moves to the detection notch, the travel switch can sense the limit ring.

The invention also provides a gas turbine, which comprises a gas compressor, a combustion chamber and a turbine which are sequentially connected, wherein a rotating mechanism and a circle of air inlet guide vanes arranged on the rotating mechanism are arranged in the gas compressor, the gas compressor is provided with the hydraulic actuating mechanism, and the connecting piece is connected with the rotating mechanism through a transmission connecting rod.

As described above, the hydraulic actuator and the gas turbine according to the present invention have the following advantageous effects:

according to the application, the travel of the piston rod is limited and regulated on line through the travel regulating device, so that the travel control and on-line regulation of the hydraulic actuating mechanism are realized, the flexibility is good, the specific design requirements and the opening range of the air inlet guide vane of the air compressor can be met, and the mechanical limitation is provided to ensure the safety of the air inlet guide vane of the air compressor.

Drawings

FIG. 1 is a schematic view of a gas turbine engine according to the present application.

Fig. 2 to 4 are schematic structural views of a hydraulic actuator according to the present application.

Fig. 5 is a schematic diagram of the operation of the hydraulic actuator of the present application.

Description of element reference numerals

100. Air compressor

101. Inlet guide vane

200. Combustion chamber

300. Turbine

400. Transmission connecting rod

1. Connecting piece

2. Oil cylinder

21. Cylinder body

22. Piston rod

23. Front end cover

231. Front connecting shaft

24. Rear end cap

241. Rear connecting shaft

25. Limiting ring

26. Piston

27. First oil chamber

28. Second oil chamber

31. Front limiting piece

32. Rear limiting piece

41. Connecting block

42. Guide rod

5. Control valve group

51. Servo valve

52. Fail-safe valve

53. First electromagnetic valve

54. Second electromagnetic valve

55. First pressure switch

56. Second pressure switch

57. High-pressure filter

58. One-way valve

59. Shuttle valve

510. Integrated block

6. Control oil circuit

61. Oil supply port

62. Oil return port

63. Main oil supply pipeline

64. First oil distribution pipeline

65. Second oil distribution pipeline

7. Sensor protection device

71. Fixing flange

72. Fixing rod

73. Protective tube

74. Protection box

75. Travel switch

8. Displacement sensor

9. Lifting screw

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used herein for descriptive purposes only and not for purposes of limitation, and are intended to limit the scope of the invention as defined by the claims and the relative terms thereof as construed as corresponding to the claims.

The present application also provides a gas turbine, as shown in fig. 1, comprising a compressor 100, a combustion chamber 200 and a turbine 300 connected in sequence; wherein, the compressor 100 is provided with a rotating mechanism and a circle of air inlet guide vanes 101 arranged on the rotating mechanism; the compressor 100 is provided with a hydraulic actuator having a telescopic connecting member 1, the connecting member 1 being connected to a rotating mechanism by a transmission link 400; when the connecting piece 1 of the hydraulic actuating mechanism moves in a telescopic way, the connecting piece 1 drives the rotating mechanism to rotate through the transmission connecting rod 400, and the angle of the rotating mechanism is adjusted, so that the air inlet angle of the air inlet guide vane 101 of the air compressor is accurately controlled, the air quantity entering the air compressor 100 is adjusted, and finally, the normal starting of the gas turbine and the exhaust steam temperature under the high-load condition are ensured. Therefore, the hydraulic actuator in the application is an intake guide vane 101 hydraulic actuator, namely an IGV hydraulic actuator.

As shown in fig. 2 to 4, the IGV hydraulic actuator according to the present application includes an oil cylinder 2, a stroke adjusting device, and a connecting piece 1 acting on an intake vane 101 of a compressor, the oil cylinder 2 having a cylinder 21, a piston rod 22 that is retractable back and forth, a front end cover 23 and a rear end cover 24 that are respectively fixed at the front and rear ends of the cylinder 21, and a stopper ring 25 that is fixed at the rear end of the piston rod 22 and is located outside the cylinder 21, the piston rod 22 being movably threaded back and forth in the front end cover 23 and the rear end cover 24, the connecting piece 1 being fixed at the front end of the piston rod 22 and being located outside the cylinder 21, the stroke adjusting device having a front stopper 31 and a rear stopper 32, the front stopper 31 being mounted to the front end cover 23, the rear stopper 32 being mounted to the rear end cover 24; accordingly, the connector 1, the front stopper 31, the rear stopper 32 and the stopper ring 25 are arranged in this order from front to rear. In the process of adjusting the air inlet angle of the air inlet guide vane 101 of the air compressor, when the piston rod 22 moves forwards, the piston rod 22 drives the connecting piece 1 and the limiting ring 25 to move forwards together, and the forward travel of the piston rod 22 is limited by the abutting of the limiting ring 25 and the rear limiting piece 32; when the piston rod 22 moves backward, the piston rod 22 drives the connecting piece 1 and the limiting ring 25 to move backward together, and the backward movement stroke of the piston rod 22 is limited by the abutment of the connecting piece 1 and the front limiting piece 31. Therefore, the application limits the movement stroke of the piston rod 22 through the stroke adjusting device, thereby limiting the movement stroke of the connecting piece 1 and realizing the stroke control of the hydraulic actuating mechanism. In particular, the mounting position of the front stopper 31 on the front cover 23 is adjustable back and forth, so that the rearward travel of the piston rod 22 can be adjusted; the mounting position of the rear limiting piece 32 on the rear end cover 24 is adjustable back and forth, so that the forward travel of the piston rod 22 can be adjusted; therefore, the application also realizes the on-line adjustment of the travel of the hydraulic actuating mechanism, has good flexibility, can meet specific design requirements and the opening interval of the air inlet guide vane 101 of the air compressor, and simultaneously provides mechanical limit to ensure the safety of the air inlet guide vane 101 of the air compressor.

In addition, as shown in fig. 2 to 5, the hydraulic actuator is also matched with a control oil way 6, the oil cylinder 2 is also provided with a piston 26 which is fixed with a piston rod 22 and is in sliding fit with the inner wall of a cylinder body 21, the cylinder body 21 is internally provided with a first oil cavity 27 which is positioned between the piston 26 and a front end cover 23 and a second oil cavity 28 which is positioned between the piston 26 and a rear end cover 24, and the first oil cavity 27 and the second oil cavity 28 are connected with the control oil way 6; when oil is supplied into the first oil chamber 27 in the control oil passage 6 and the second oil chamber 28 discharges oil to the oil return port 62 of the control oil passage 6, the hydraulic oil drives the piston 26 and the piston rod 22 to move backward, realizing the opening/retracting function of the hydraulic actuator; when oil is supplied into the second oil chamber 28 from the control oil passage 6 and the oil is discharged from the first oil chamber 27 to the oil return port 62 of the control oil passage 6, the hydraulic oil drives the piston 26 and the piston rod 22 to move forward, realizing the closing/extending function of the hydraulic actuator. In the application, the hydraulic actuating mechanism is driven by high-pressure wear-resistant turbine oil, so the hydraulic actuating mechanism is also called an oil engine. The cylinder 2 is provided with sealing elements between the piston rod 22 and the front end cover 23, between the piston rod 22 and the rear end cover 24, between the front end cover 23 and the cylinder body 21, between the rear end cover 24 and the cylinder body 21, between the piston 26 and the cylinder body 21 and between the piston 26 and the piston rod 22, so that high-pressure oil leakage is prevented, and the accurate control of the air inlet angle of the air inlet guide vane 101 of the compressor by the hydraulic actuator is ensured.

Preferably, as shown in fig. 2 to 4, the connection structure between the front end cover 23 and the front stopper 31 is: the front end of the front end cover 23 is provided with a front connecting shaft part 231 extending forwards, and a front limiting piece 31 is connected with the periphery of the front connecting shaft part 231 in a threaded manner and is locked between the front connecting shaft part 231 through a screw; when the backward travel of the piston rod 22 needs to be regulated, the screw is unscrewed, the front limiting piece 31 is rotated into position according to actual needs, and then the screw is locked and fixed with the front limiting piece 31 and the front end cover 23. The connection structure between the rear end cap 24 and the rear stopper 32 is: the rear end of the rear end cover 24 is provided with a rear connecting shaft part 241 extending backwards, and a rear limiting piece 32 is connected with the periphery of the rear connecting shaft part 241 in a threaded manner and is locked between the rear connecting shaft part 241 by a screw; when the forward travel of the piston rod 22 needs to be adjusted, the screw is unscrewed, the rear limiting member 32 is rotated into position according to actual needs, and then the screw is locked and fixed with the rear limiting member 32 and the rear end cover 24.

As shown in fig. 2 to 4, the hydraulic actuator further includes an anti-rotation device including a connection block 41 fixed to the connection member 1, a guide rod 42 extending back and forth in the extension and retraction direction of the piston rod 22, and a guide hole provided in the front end cover 23, the guide rod 42 being engaged with the guide hole, the guide rod 42 being fixed to the connection block 41. The guide rod 42 is limited to move back and forth only through the cooperation of the guide rod 42 and the guide hole, so that on one hand, a better guide effect can be achieved, on the other hand, the guide rod 42 and the piston rod 22 can not rotate relatively, and therefore the piston rod 22 is prevented from rotating in the cylinder body 21 of the oil cylinder 2, and further the connecting piece 1 is limited to rotate, deviation of the opening of the air inlet guide vane 101 of the air compressor caused by change of a working stroke can be avoided, and damage of the air inlet guide vane 101 of the air compressor caused by accidental rotation can be prevented.

As shown in fig. 2 to 5, the hydraulic actuating mechanism is also matched with a control system, a control valve group 5 with a plurality of control valves and a displacement sensor 8; the control system comprises a controller, a control module, a power supply module and other control elements, and the control system, the control valve group 5, the displacement sensor 8 and the like together realize a control function; a plurality of control valves in the control valve group 5 are all arranged in the control oil way 6 and are used for controlling oil to enter a first oil cavity 27 or a second oil cavity 28 of the oil cylinder 2, so that the opening and closing functions of the hydraulic actuating mechanism are realized; the displacement sensor 8 extends into the rear section of the piston rod 22 for monitoring the displacement of the piston rod 22; the control system controls the stroke of the hydraulic actuating mechanism by controlling the control valves, and the control system can judge whether the hydraulic actuating mechanism moves in place or not according to the feedback signals of the displacement sensors 8. The control system of the present application is therefore preferably a closed loop control system that can be integrated into the closed loop control of a gas turbine.

The hydraulic actuator further comprises a sensor protection device 7 for securing and protecting the displacement sensor 8. Specifically, as shown in fig. 2 to 5, the sensor protector 7 includes a fixing flange 71, a fixing rod 72 extending in the front-rear direction, a protection tube 73 and a protection box 74, the rear end cap 24 is disposed in the front-rear direction with respect to the fixing flange 71, the front-rear ends of the fixing rod 72 are respectively fixed to the rear end cap 24 and the fixing flange 71, the protection tube 73 is fitted around the rear end portion of the piston rod 22, the front-rear ends of the protection tube 73 are respectively fitted to the rear stopper 32 and the fixing flange 71, the protection tube 73 covers the probe of the displacement sensor 8 to protect the probe of the displacement sensor 8, and the protection box 74 is covered outside the sensor and is fixed to the fixing flange 71. In addition, a travel switch 75 for monitoring the displacement of the piston rod 22 is also arranged on the fixed rod 72, and the travel switch 75 is connected with a control system; the travel switch 75 is arranged on the fixed rod 72, and a detection notch is formed in the position of the travel switch 75 on the protection tube 73; when the limit ring 25 at the rear end of the piston rod 22 moves to the detection notch, the travel switch 75 can sense the limit ring 25, and the travel switch 75 can monitor signal change.

Further, the control valve group 5 preferably adopts the following structure: as shown in fig. 5, the plurality of control valves includes a servo valve 51, a fail-safe valve 52, and a solenoid valve; preferably, the solenoid valves are redundant solenoid valves, and there are two solenoid valves, a first solenoid valve 53 and a second solenoid valve 54, respectively; the control oil path 6 has an oil supply port 61 and an oil return port 62, the port P of the servo valve 51, the port P of the fail-safe valve 52, the port X of the servo valve 51, the port P of the first solenoid valve 53, and the port P of the second solenoid valve 54 are all connected to the oil supply port 61, the port X of the servo valve 51 is the high-pressure oil supply port 61 of the servo valve 51, the ports a and B of the servo valve 51 are respectively connected to two oil ports in the fail-safe valve 52, the port B of the fail-safe valve 52 is connected to the first oil chamber 27 of the oil cylinder 2, the port a of the fail-safe valve 52 is connected to the second oil chamber 28 of the oil cylinder 2, the port a of the first solenoid valve 53 and the port a of the second solenoid valve 54 are all connected to the drive port of the fail-safe valve 52, and the port T of the servo valve 51, the port T of the fail-safe valve 52, the port T of the first solenoid valve 53, and the port T of the second solenoid valve 54 are all connected to the oil return port 62; the failsafe valve 52 is a two-position six-way hydraulic valve. Preferably, the control oil path 6 connected between the oil supply port 61 and the servo valve 51, the fail-safe valve 52, the first solenoid valve 53, and the second solenoid valve 54 includes a main oil supply line 63, a first branch oil supply line 64, and a second branch oil supply line 65, one end of the main oil supply line 63 is connected to the oil supply port 61, the other end is connected to one end of the first branch oil supply line 64 and one end of the second branch oil supply line 65, the other end of the first branch oil supply line 64 is connected to the P port of the servo valve 51 and the P port of the fail-safe valve 52, respectively, and the other end of the second branch oil supply line 65 is connected to the X port of the servo valve 51, the P port of the first solenoid valve 53, and the P port of the second solenoid valve 54, respectively, in three branches; the main oil supply line 63 is connected to the high-pressure filter 57; the plurality of control valves further includes a check valve 58 connected to a first distribution line 64.

When the hydraulic actuator operates normally, the first electromagnetic valve 53 and the second electromagnetic valve 54 are powered off, and the servo valve 51 receives positive and negative command signals of the control system to realize the normal opening and closing functions of the hydraulic actuator. Specifically, the hydraulic oil enters the main oil supply pipeline 63 from the oil supply port 61, is split into two paths after passing through the high-pressure filter 57, and enters the P port of the servo valve 51 and the P port of the fail-safe valve 52 after passing through the first oil distribution pipeline 64 and the one-way valve 58 respectively, and the hydraulic oil entering the P port of the servo valve 51 switches the P- & gt A, B- & gtT oil path or the P- & gt B, A- & gtT oil path of the servo valve 51 through the servo valve 51, so that the oil is fed into and returned from the first oil cavity 27 or the second oil cavity 28 of the oil cylinder 2, and the normal opening and closing functions of the hydraulic executing mechanism are realized; the hydraulic oil that enters the P port of the fail-safe valve 52 acts as a bypass when the hydraulic actuator fails to close. The other path of hydraulic oil enters the X port of the servo valve 51, the P port of the first electromagnetic valve 53 and the P port of the second electromagnetic valve 54 respectively after passing through the second oil distribution pipeline 65, and when the first electromagnetic valve 53 and the second electromagnetic valve 54 lose electricity, the P port and the A port of the first electromagnetic valve 53 and the second electromagnetic valve 54 are not communicated, so that hydraulic oil cannot enter the fail-safe valve 52. Based on the above, the hydraulic actuator can realize a normal open/close function. When the first solenoid valve 53 and/or the second solenoid valve 54 are energized, the hydraulic actuator achieves a closing function through the failsafe valve 52. Specifically, when the first electromagnetic valve 53, the second electromagnetic valve 54, or the first electromagnetic valve 53 and the second electromagnetic valve 54 are energized, hydraulic oil enters the fail-safe valve 52 through p→a of the first electromagnetic valve 53, p→a of the second electromagnetic valve 54, or p→a of the first electromagnetic valve 53 and p→a of the second electromagnetic valve 54, the fail-safe valve 52 acts under the driving of the hydraulic oil, at this time, the hydraulic oil entering the P port of the servo valve 51 during normal operation bypasses the fail-safe valve 52 to realize the p→ A, B →t oil path of the fail-safe valve 52, so the hydraulic oil enters the second oil chamber 28 of the oil cylinder 2, and the hydraulic oil in the first oil chamber 27 of the oil cylinder 2 is discharged, and therefore, any one of the solenoid energizing actions can make the hydraulic actuator realize the fail-close function. Therefore, the hydraulic actuator according to the present application has a normal open function and a failure close function, and the compressor inlet guide vane 101 can be operated only in the direction of the safety switch.

The control valve group 5 further comprises two pressure switches connected to each electromagnetic valve, namely a first pressure switch 55 connected to the port A of the first electromagnetic valve 53 and a second pressure switch 56 connected to the port A of the second electromagnetic valve 54, wherein the first pressure switch 55 and the second pressure switch 56 are connected with a control system, the first pressure switch 55 is used for detecting the oil circuit pressure of the first electromagnetic valve 53, and the second pressure switch 56 is used for detecting the oil circuit pressure of the second electromagnetic valve 54 and judging whether the first electromagnetic valve 53 and the second electromagnetic valve 54 are in an operating state. In addition, a shuttle valve 59 is provided between the a port of the first solenoid valve 53 and the a port of the second solenoid valve 54, and the shuttle valve 59 is opened by oil pressure driving; when both solenoid valves are electrified or any solenoid valve is electrified, the P-A passage of the solenoid valve passes through the shuttle valve 59, so that the fault safety valve 52 is driven to act; the arrangement of two solenoid valves can avoid the failure of the hydraulic actuator fault shut-off function caused by the inactivity of one of the solenoid valves. The working mode of one of the two electromagnetic valves meets the reliable design requirement, and meets the control reliability and safety requirement of an important key actuating mechanism.

Further, as shown in fig. 2 to 4, the control valve group 5 further includes an integrated block 510, and a plurality of control valves are integrated on the integrated block 510, and the integrated block 510 further includes components such as an oil path, a plug for plugging the oil path, a pressure measuring joint, and a lifting screw 9, which perform functions of controlling the telescopic movement of the piston rod 22, fault closing, filtering, pressure monitoring, and the like in the hydraulic actuator. The hoisting screw 9 is also connected to the front end cap 23 of the cylinder 2.

In summary, the hydraulic actuator disclosed by the application has a compact structure, and the functional design parameters meet the technical requirements, so that the control requirements of high-precision high-frequency response of the gas turbine compressor inlet guide vane 101, including static and dynamic control requirements, can be met, and the normal operation of the gas turbine is ensured. Therefore, the application effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A hydraulic actuator, characterized by: the hydraulic cylinder comprises an oil cylinder (2), a stroke adjusting device and a connecting piece (1) acting on an air inlet guide vane (101) of the air compressor, wherein the oil cylinder (2) is provided with a cylinder body (21), a telescopic piston rod (22), a front end cover (23) and a rear end cover (24) which are fixed at two ends of the cylinder body (21), and a limiting ring (25) which is fixed at the rear end of the piston rod (22) and is positioned outside the cylinder body (21), the connecting piece (1) is fixed at the front end of the piston rod (22) and is positioned outside the cylinder body (21), the stroke adjusting device is provided with a front limiting piece (31) capable of being abutted with the connecting piece (1) and a rear limiting piece (32) capable of being abutted with the limiting ring (25), the front limiting piece (31) is installed on the front end cover (23) and the installation position is adjustable front and back;

The front end of the front end cover (23) is provided with a front connecting shaft part (231) extending forwards, and the front limiting piece (31) is connected with the periphery of the front connecting shaft part (231) in a threaded manner and is locked by a screw; the rear end of the rear end cover (24) is provided with a rear connecting shaft part (241) extending backwards, and the rear limiting piece (32) is connected with the periphery of the rear connecting shaft part (241) in a threaded mode and is locked through screws.

2. The hydraulic actuator of claim 1, wherein: the anti-rotation device comprises a connecting block (41) fixed on the connecting piece (1), a guide rod (42) extending back and forth along the telescopic direction of the piston rod (22), and a guide hole formed in the front end cover (23), wherein the guide rod (42) is matched with the guide hole, and the guide rod (42) is fixed with the connecting block (41).

3. The hydraulic actuator of claim 1, wherein: the hydraulic control device is also matched with a control system, a control oil way (6), a control valve group (5) with a plurality of control valves and a displacement sensor (8), wherein the displacement sensor (8) extends into the rear section of the piston rod (22), the plurality of control valves and the displacement sensor (8) are connected with the control system, and the control valve group (5) is arranged in the control oil way (6); the oil cylinder (2) is further provided with a piston (26) which is fixed with the piston rod (22) and is in sliding fit with the inner wall of the cylinder body (21), the cylinder body (21) is internally provided with a first oil cavity (27) which is positioned between the piston (26) and the front end cover (23) and a second oil cavity (28) which is positioned between the piston (26) and the rear end cover (24), and the first oil cavity (27) and the second oil cavity (28) are connected with the control oil circuit (6).

4. A hydraulic actuator according to claim 3, wherein: the plurality of control valves comprise a servo valve (51), a fail-safe valve (52) and electromagnetic valves (53 and 54), wherein the control oil way (6) is provided with an oil supply port (61) and an oil return port (62), a P port of the servo valve (51), an X port of the servo valve (51) and P ports of the electromagnetic valves (53 and 54) are all connected with the oil supply port (61), an A port and a B port of the servo valve (51) are all connected with an oil port of the fail-safe valve (52), a B port of the fail-safe valve (52) is connected with a first oil cavity (27) of the oil cylinder (2), an A port of the fail-safe valve (52) is connected with a second oil cavity (28) of the oil cylinder (2), an A port of the electromagnetic valves (53 and 54) is connected with a driving port of the fail-safe valve (52), and a T port of the servo valve (51), a T port of the fail-safe valve (52) and a T port of the electromagnetic valves (53 and 54) are all connected with the oil return port (62).

5. The hydraulic actuator of claim 4, wherein: the control valve group (5) further comprises pressure switches (55, 56), the pressure switches (55, 56) are connected with A ports of the electromagnetic valves (53, 54), and the pressure switches (55, 56) are connected with a control system.

6. The hydraulic actuator of claim 4, wherein: the control oil way (6) comprises a main oil supply pipeline (63), a first oil distribution pipeline (64) and a second oil distribution pipeline (65), one end of the main oil supply pipeline (63) is connected with the oil supply port (61), the other end of the main oil supply pipeline is connected with one end of the first oil distribution pipeline (64) and one end of the second oil distribution pipeline (65), the other end of the first oil distribution pipeline (64) is respectively connected with a P port of the servo valve (51) and a P port of the fault safety valve (52), and the other end of the second oil distribution pipeline (65) is respectively connected with an X port of the servo valve (51) and P ports of the electromagnetic valves (53 and 54); the main oil supply pipeline (63) is connected with a high-pressure filter (57); the plurality of control valves further includes a check valve (58) connected to the first distribution line (64).

7. A hydraulic actuator according to claim 3, wherein: still include sensor protection device (7), sensor protection device (7) include mounting flange (71), dead lever (72), protection tube (73) and guard box (74), back end cover (24) are arranged around with mounting flange (71), both ends are fixed in back end cover (24) and mounting flange (71) respectively around dead lever (72), protection tube (73) cover is in the periphery of piston rod (22) back end part, and both ends cup joint respectively in back locating part (32) and mounting flange (71) around the protection tube (73), guard box (74) shroud are being located the outside of sensor and are fixed in mounting flange (71).

8. The hydraulic actuator of claim 7, wherein: the fixed rod (72) is also provided with a travel switch (75) for monitoring the displacement of the piston rod (22), and the travel switch (75) is connected with a control system; the travel switch (75) is arranged on the fixed rod (72), and a detection notch is formed in the position of the travel switch (75) on the protection tube (73); when the limit ring (25) at the rear end of the piston rod (22) moves to the detection notch, the travel switch (75) can sense the limit ring (25).

9. The utility model provides a gas turbine, includes compressor (100), combustion chamber (200) and turbine (300) that link to each other in proper order, be equipped with slewing mechanism in compressor (100) and round install in slewing mechanism's air inlet guide vane (101), its characterized in that: the compressor (100) is provided with a hydraulic actuator according to any one of claims 1-8, the connecting piece (1) being connected to the rotating mechanism by means of a transmission link (400).