Speed governing actuator for steam turbine

Abstract

The utility model discloses a steam turbine speed governing executive mechanism, include: controller, first electromagnetic reversing valve, second electromagnetic reversing valve, shuttle valve and oil cylinder, and the controller is connected with first electromagnetic reversing valve and second electromagnetic reversing valve, and first electromagnetic reversing valve is connected with the first oil inlet of shuttle valve, and second electromagnetic reversing valve is connected with the second oil inlet of shuttle valve, and the oil outlet of shuttle valve is connected with oil cylinder, and oil cylinder is used for and the air valve of steam turbine's adjusting door connects. In the specific work, can through sending control signal to first electromagnetic reversing valve, realizes first electromagnetic reversing valve and shuttle valve intercommunication, and second electromagnetic reversing valve simultaneously as spare, when first electromagnetic reversing valve appears the fault, controller controls second electromagnetic reversing valve and shuttle valve intercommunication again, namely first electromagnetic reversing valve and second electromagnetic reversing valve constitute double redundancy design, can effectively guarantee the reliable operation of steam turbine, and can realize the purpose of on -line replacement electromagnetic reversing valve, guarantees the stable operation of steam turbine.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and in particular to a steam turbine speed regulating actuator. Background Technology

[0002] The turbine speed regulating mechanism is an important component to ensure the safe operation of the turbine. It can effectively prevent the turbine from being damaged by overspeed and quickly adjust the speed when the load changes.

[0003] Traditional turbine speed control actuators typically consist of an electro-hydraulic converter, a throttle valve, and a hydraulic cylinder, all interconnected by inlet, outlet, and control oil lines. This complex structure makes fault analysis and diagnosis difficult. Furthermore, traditional speed control actuators, primarily mechanical in nature, exhibit relatively low control accuracy and stability. After receiving the secondary hydraulic pressure control signal from the electro-hydraulic converter, the throttle valve supplies oil to the hydraulic actuator by altering the position of its internal slide valve, with the actual valve position fed back via a mechanical lever. The mechanical structure is prone to wear, leading to fluctuations in the throttle valve's output flow, which in turn causes fluctuations in the turbine's speed.

[0004] Therefore, how to ensure the stable operation of steam turbines is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a turbine speed regulating actuator that can effectively ensure the reliability of system operation.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A turbine speed regulating actuator includes: a controller, a first electromagnetic directional valve, a second electromagnetic directional valve, a shuttle valve, and a hydraulic cylinder. The controller is connected to the first electromagnetic directional valve and the second electromagnetic directional valve. The first electromagnetic directional valve is connected to the first oil inlet of the shuttle valve, the second electromagnetic directional valve is connected to the second oil inlet of the shuttle valve, and the oil outlet of the shuttle valve is connected to the hydraulic cylinder. The hydraulic cylinder is used to connect to the turbine's air valve regulating valve. The controller is used to control the first electromagnetic directional valve or the second electromagnetic directional valve to communicate with the shuttle valve.

[0008] In some embodiments, the turbine speed regulating actuator further includes a first position sensor and a second position sensor. The first position sensor and the second position sensor are used to detect the valve position of the gas valve regulating valve. The first position sensor is connected to the first solenoid directional valve, and the second position sensor is connected to the second solenoid directional valve. The first solenoid directional valve is used to receive the control signal from the controller and compare it with the valve position feedback signal from the first position sensor. The second solenoid directional valve is used to receive the control signal from the controller and compare it with the valve position feedback signal from the second position sensor.

[0009] In some embodiments, the first solenoid directional valve and the second solenoid directional valve are integrated into a single valve block, or the first solenoid directional valve, the second solenoid directional valve, and the shuttle valve are integrated into a single valve block.

[0010] In some embodiments, both the first solenoid directional valve and the second solenoid directional valve are three-position three-way solenoid directional valves.

[0011] In some embodiments, the turbine speed regulating actuator further includes a first normally open two-position two-way valve and a second normally open two-position two-way valve. The first normally open two-position two-way valve is connected to the first solenoid directional valve, and the second normally open two-position two-way valve is connected to the second solenoid directional valve. The first normally open two-position two-way valve and the second normally open two-position two-way valve are respectively connected to a hydraulic oil supply device.

[0012] In some embodiments, the first normally open two-position two-way valve and the second normally open two-position two-way valve are integrated into the valve block.

[0013] In some embodiments, the hydraulic oil supply device includes a variable hydraulic pump connected to the controller.

[0014] In some embodiments, a first pressure monitor is provided in the oil line between the first solenoid directional valve and the shuttle valve, and a second pressure monitor is provided in the oil line between the second solenoid directional valve and the shuttle valve.

[0015] In some embodiments, the controller is connected to the first pressure monitor and the second pressure monitor respectively, and the controller is used to issue a warning signal when the pressure monitored by the first pressure monitor and / or the second pressure monitor does not meet a preset threshold.

[0016] In some embodiments, both the first electromagnetic reversing valve and the second electromagnetic reversing valve include a VRM control magnet, a power transmission push rod, a first potentiometer group, a second potentiometer group, an explosion-proof cable connector, a control cavity, a control piston, a base, a control spring, and a manual operation knob. The first and second potentiometer groups are disposed on the VRM control magnet. The explosion-proof cable connector is connected to the VRM control magnet. The manual operation knob is connected to the VRM control magnet. The VRM control magnet is connected to one end of the control cavity. The base is connected to the other end of the control cavity. The control piston is disposed inside the control cavity. Both ends of the control spring abut against the control piston and the base, respectively. The power transmission push rod contacts the end of the control piston away from the control spring and is used to control the movement of the control piston within the control cavity. An oil port is provided on the side wall of the control cavity.

[0017] Compared with existing technologies, the above technical solution has the following advantages:

[0018] This utility model provides a turbine speed regulating actuator, comprising: a controller, a first electromagnetic directional valve, a second electromagnetic directional valve, a shuttle valve, and a hydraulic cylinder. The first and second electromagnetic directional valves can receive control signals from the control valve. In operation, a control signal can be sent to the first electromagnetic directional valve to control its operation, thereby connecting the first electromagnetic directional valve with the shuttle valve. The second electromagnetic directional valve serves as a backup; when the first electromagnetic directional valve malfunctions, the controller controls the second electromagnetic directional valve to connect with the shuttle valve, thus enabling the hydraulic cylinder to control the valve. Similarly, when the second electromagnetic directional valve malfunctions, the controller can control the first electromagnetic directional valve. This dual-redundancy design of the first and second electromagnetic directional valves ensures mutual backup, effectively guaranteeing reliable turbine operation and enabling online replacement of the electromagnetic directional valves, thus ensuring stable turbine operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a steam turbine speed regulating actuator provided for a specific embodiment of this utility model;

[0021] Figure 2A schematic diagram illustrating the working principle of a steam turbine speed regulating actuator provided for a specific embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of a first electromagnetic reversing valve or a second electromagnetic reversing valve of a turbine speed regulating actuator provided for a specific embodiment of this utility model.

[0023] The attached figures are labeled as follows:

[0024] 100-Controller;

[0025] 210-First solenoid directional valve, 211-First normally open two-position two-way valve, 212-First pressure monitor, 220-Second solenoid directional valve, 221-Second normally open two-position two-way valve, 222-Second pressure monitor;

[0026] 300-Shuttle Valve;

[0027] 400-Hydraulic Cylinder;

[0028] 500 - Steam turbine; 510 - Air valve;

[0029] 610 - First position sensor; 620 - Second position sensor;

[0030] 700 - Hydraulic oil supply device;

[0031] 1-VRM control magnet, 2-Power transmission push rod, 3-First potentiometer group, 4-Second potentiometer group, 5-Explosion-proof cable connector, 6-Control chamber, 7-Control piston, 8-Base, 9-Control spring, 10-Manual operation knob. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please refer to Figures 1 to 3 .

[0034] The turbine speed regulating actuator provided in this embodiment includes: a controller 100, a first electromagnetic reversing valve 210, a second electromagnetic reversing valve 220, a shuttle valve 300, and a hydraulic cylinder 400. Figure 1As shown, the controller 100 is connected to the first solenoid directional valve 210 and the second solenoid directional valve 220. The controller 100 can send control signals to the first solenoid directional valve 210 and the second solenoid directional valve 220 to realize the switching operation of the first solenoid directional valve 210 and the second solenoid directional valve 220. The shuttle valve 300 has three oil ports: a first oil inlet, a second oil inlet, and an oil outlet. The first solenoid directional valve 210 is connected to the first oil inlet of the shuttle valve 300, the second solenoid directional valve 220 is connected to the second oil inlet of the shuttle valve 300, and the oil outlet of the shuttle valve 300 is connected to the hydraulic cylinder 400. The hydraulic cylinder 400 is used to connect to the air valve regulating valve 510 of the steam turbine 500. Through the extension and retraction of the hydraulic cylinder 400, the position of the air valve regulating valve 510 can be changed, thereby realizing the speed regulation function of the steam turbine 500. The first solenoid directional valve 210 and the second solenoid directional valve 220 can receive control signals sent by the control valve, such as standard 4-20mA control signals. In specific operation, a control signal can be sent to the first solenoid directional valve 210 to control its operation, thereby connecting the first solenoid directional valve 210 with the shuttle valve 300. The second solenoid directional valve 220 serves as a backup; when the first solenoid directional valve 210 malfunctions, the controller 100 then controls the second solenoid directional valve. The second solenoid directional valve 220 is activated to connect with the shuttle valve 300, thereby enabling the hydraulic cylinder 400 to control the pneumatic valve regulator 510. Similarly, when the second solenoid directional valve 220 malfunctions, the first solenoid directional valve 210 can be activated. That is, the first solenoid directional valve 210 and the second solenoid directional valve 220 constitute a dual redundancy design, thereby achieving mutual backup. This can effectively ensure the reliable operation of the turbine 500 and enable online replacement of the solenoid directional valves, ensuring the stable operation of the turbine 500.

[0035] In some embodiments, the turbine 500 speed regulating actuator further includes a first position sensor 610 and a second position sensor 620, both of which can be selected as LVDT (Linear Variable Differential Transmission). Transformer (LVDT) position sensors are used in the turbine 500 during operation. The first position sensor 610 and the second position sensor 620 detect the valve position of the valve control valve 510. Specifically, the valve position can be detected by detecting the position of the valve stem of the valve control valve 510, or indirectly by detecting the extension / retraction position of the hydraulic cylinder 400. The first position sensor 610 is connected to the first solenoid directional valve 210, and the second position sensor 620 is connected to the second solenoid directional valve 220. The first solenoid directional valve 210 receives the control signal from the controller 100 and compares it with the valve position feedback signal from the first position sensor 610. The second solenoid directional valve 220 receives the control signal from the controller 100 and compares it with the valve position feedback signal from the second position sensor 620. The valve position feedback signal can effectively improve the control accuracy of the first solenoid directional valve 210 and the second solenoid directional valve 220, thereby achieving precise control of the air valve 510. For example, when the opening of the first solenoid directional valve 210 or the second solenoid directional valve 220 is small, the displacement of the air valve 510 is small and does not reach the target position. At this time, the valve position of the air valve 510 will be detected by the first position sensor 610 and the second position sensor 620 and fed back to the first solenoid directional valve 210 and the second solenoid directional valve 220. Since the first solenoid directional valve 210 is in working state at this time, it will adjust to increase its opening, so that the valve position of the air valve 510 reaches the target position. That is, the first solenoid directional valve 210 and the second solenoid directional valve 220 in this technical solution are closed-loop controlled and can be adjusted in real time to ensure control accuracy.

[0036] In some embodiments, the first solenoid directional valve 210 and the second solenoid directional valve 220 are integrated into a single valve block, or the first solenoid directional valve 210, the second solenoid directional valve 220, and the shuttle valve 300 are integrated into a single valve block. This reduces the number of pipeline and electrical connections, thereby reducing the risk of oil leakage. Furthermore, integration into a single valve block ensures overall simplicity, strong adaptability to oil quality degradation, stable operation, and ease of maintenance. Both the first solenoid directional valve 210 and the second solenoid directional valve 220 are three-position, three-way solenoid directional valves.

[0037] In some embodiments, such as Figure 2As shown, the turbine 500 speed regulating actuator also includes a first normally open two-position two-way valve 211 and a second normally open two-position two-way valve 221. The first normally open two-position two-way valve 211 is connected to a first solenoid directional valve 210, and the second normally open two-position two-way valve 221 is connected to the second solenoid directional valve 220. The first normally open two-position two-way valve 211 and the second normally open two-position two-way valve 221 are respectively connected to a hydraulic oil supply device 700. The hydraulic oil supply device 700 includes a variable hydraulic pump, which is connected to a controller 100. The variable hydraulic pump enables variable supply of hydraulic oil to achieve the flexibility of hydraulic system adjustment. The first normally open two-position two-way valve 211 and the second normally open two-position two-way valve 221 are integrated into a valve block. The first normally open two-position two-way valve 211 and the second normally open two-position two-way valve 221 can be selected as manual valves.

[0038] In some embodiments, such as Figure 2 As shown, a first pressure monitor 212 is installed on the oil line between the first solenoid directional valve 210 and the shuttle valve 300, and a second pressure monitor 222 is installed on the oil line between the second solenoid directional valve 220 and the shuttle valve 300, to realize pressure monitoring of the corresponding oil lines. Furthermore, the controller 100 is connected to the first pressure monitor 212 and the second pressure monitor 222 respectively. When the pressure monitored by the first pressure monitor 212 and / or the second pressure monitor 222 does not meet the preset threshold, the controller 100 issues a warning signal, such as a light signal or an audible signal, to prevent further damage to the hydraulic system. In addition, when the pressure is high, the controller 100 can control the hydraulic oil supply device 700 to reduce or stop the oil supply.

[0039] In some embodiments, such as Figure 3 As shown, both the first electromagnetic directional valve 210 and the second electromagnetic directional valve 220 include a VRM control magnet 1, a power transmission push rod 2, a first potentiometer group 3, a second potentiometer group 4, an explosion-proof cable connector 5, a control chamber 6, a control piston 7, a base 8, a control spring 9, and a manual operation knob 10. The first potentiometer group 3 and the second potentiometer group 4 are mounted on the VRM control magnet 1. The first potentiometer group 3 includes a first potentiometer X0 and a first potentiometer X1, and the second potentiometer group 4 includes a second potentiometer F0 and a second potentiometer F1. F1, the explosion-proof cable connector 5 is connected to the VRM control magnet 1, the manual operation knob 10 is connected to the VRM control magnet 1, the VRM control magnet 1 is connected to one end of the control cavity 6, the base 8 is connected to the other end of the control cavity 6, the control piston 7 is located inside the control cavity 6, the two ends of the control spring 9 are respectively pressed against the control piston 7 and the base 8, the power transmission push rod 2 contacts the end of the control piston 7 away from the control spring 9, used to move the control piston 7 inside the control cavity 6, the side wall of the control cavity 6 is provided with an oil port, in which... Figure 3As shown, the oil ports include port P, port A and port T. The power transmission tappet 2 can control the piston 7 to move to the right, and the control spring 9 can control the piston 7 to reset.

[0040] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0042] The above provides a detailed description of the turbine speed regulating actuator provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A steam turbine speed regulating actuator, characterized in that, include: The system comprises a controller, a first solenoid directional valve, a second solenoid directional valve, a shuttle valve, and a hydraulic cylinder. The controller is connected to the first solenoid directional valve and the second solenoid directional valve. The first solenoid directional valve is connected to the first oil inlet of the shuttle valve, and the second solenoid directional valve is connected to the second oil inlet of the shuttle valve. The oil outlet of the shuttle valve is connected to the hydraulic cylinder. The hydraulic cylinder is used to connect to the gas valve control valve of the steam turbine. The controller is used to control the connection between the first solenoid directional valve or the second solenoid directional valve and the shuttle valve.

2. The turbine speed regulating actuator according to claim 1, characterized in that, The turbine speed control actuator further includes a first position sensor and a second position sensor. The first position sensor and the second position sensor are used to detect the valve position of the gas valve. The first position sensor is connected to the first solenoid directional valve, and the second position sensor is connected to the second solenoid directional valve. The first solenoid directional valve is used to receive the control signal from the controller and compare it with the valve position feedback signal from the first position sensor. The second solenoid directional valve is used to receive the control signal from the controller and compare it with the valve position feedback signal from the second position sensor.

3. The turbine speed regulating actuator according to claim 1, characterized in that, The first electromagnetic directional valve and the second electromagnetic directional valve are integrated into a single valve block, or the first electromagnetic directional valve, the second electromagnetic directional valve, and the shuttle valve are integrated into a single valve block.

4. The turbine speed regulating actuator according to claim 3, characterized in that, Both the first solenoid directional valve and the second solenoid directional valve are three-position three-way solenoid directional valves.

5. The turbine speed regulating actuator according to claim 4, characterized in that, The turbine speed regulating actuator also includes a first normally open two-position two-way valve and a second normally open two-position two-way valve. The first normally open two-position two-way valve is connected to the first solenoid directional valve, and the second normally open two-position two-way valve is connected to the second solenoid directional valve. The first normally open two-position two-way valve and the second normally open two-position two-way valve are respectively connected to the hydraulic oil supply device.

6. The turbine speed regulating actuator according to claim 5, characterized in that, The first normally open two-position two-way valve and the second normally open two-position two-way valve are integrated into the valve block.

7. The turbine speed regulating actuator according to claim 1, characterized in that, The hydraulic oil supply device includes a variable hydraulic pump, which is connected to the controller.

8. The turbine speed regulating actuator according to claim 7, characterized in that, A first pressure monitor is provided in the oil line between the first solenoid directional valve and the shuttle valve, and a second pressure monitor is provided in the oil line between the second solenoid directional valve and the shuttle valve.

9. The turbine speed regulating actuator according to claim 8, characterized in that, The controller is connected to the first pressure monitor and the second pressure monitor respectively. The controller is used to issue a warning signal when the pressure monitored by the first pressure monitor and / or the second pressure monitor does not meet the preset threshold.

10. The turbine speed regulating actuator according to claim 1, characterized in that, Both the first and second electromagnetic directional valves include a VRM control magnet, a power transmission push rod, a first potentiometer group, a second potentiometer group, an explosion-proof cable connector, a control chamber, a control piston, a base, a control spring, and a manual operation knob. The first and second potentiometer groups are mounted on the VRM control magnet. The explosion-proof cable connector is connected to the VRM control magnet. The manual operation knob is connected to the VRM control magnet. The VRM control magnet is connected to one end of the control chamber. The base is connected to the other end of the control chamber. The control piston is located inside the control chamber. Both ends of the control spring abut against the control piston and the base, respectively. The power transmission push rod contacts the end of the control piston away from the control spring and is used to control the movement of the control piston within the control chamber. An oil port is provided on the side wall of the control chamber.

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