A hydraulic governing control block, control system and steam turbine

Abstract

The application provides a hydraulic adjusting control block of a steam turbine, a control system and a steam turbine, which are used for realizing stroke control of an oil motor in the steam turbine; the hydraulic adjusting control block comprises a control system, a control card, a servo control element and a feedback element; the control system is connected with the control card, and the control system sends a control instruction to the control card; the control card is connected with the servo control element, the control card receives the control instruction of the control system, processes the control instruction, and then sends the control instruction to the servo control element; the servo control element is connected with the oil motor, and is used for controlling the oil motor to work; the feedback element is used for detecting an execution result of the oil motor, and feeding back the detection result to the control card; and the control card sends a control instruction to the servo control element according to the detection result. The application solves the problem of poor safety reliability of a single control oil way and easy faults in the prior art.

Description

Technical Field

[0001] This invention relates to the field of steam turbine hydraulic control technology, and in particular to a steam turbine hydraulic regulating control block, a control system, and a steam turbine. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam enters the turbine through steam valves, and the valves control the steam flow by changing their opening degree. Steam turbine equipment is widely used in thermal power plants, metallurgical industries, chemical industries, and shipbuilding industries, where high safety and reliability are required. The hydraulic actuator control device for the steam valves is the core component of steam valve control.

[0003] In the field of hydraulic control of steam turbine valve actuators, the original regulating type steam turbine valve actuator hydraulic control device only has a single control oil circuit, which has poor safety and reliability and is prone to failure. With the development of steam turbine generator sets towards high-power integration and the development of intelligent steam turbine products, steam turbines and their control systems must have higher requirements in terms of system reliability and safety. As a key part of the steam turbine regulation system, the actuators must have higher accuracy and reliability.

[0004] Therefore, it is necessary to design a steam turbine hydraulic regulation control block, a control system, and a steam turbine to solve the problems of poor safety and reliability and easy failure of the single control oil circuit in the existing technology. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a steam turbine hydraulic regulation control block, a control system, and a steam turbine, to solve the problems of poor safety and reliability and easy failure of the single control oil circuit in the hydraulic control device of steam turbine valve oil actuator in the prior art.

[0006] To achieve the above and other related objectives, the present invention provides a steam turbine hydraulic regulating control block for controlling the stroke of the hydraulic actuator in a steam turbine. It includes a control system, a control card, a servo control element, and a feedback element. The control system is connected to the control card and sends control commands to the control card. The control card is connected to the servo control element, receives and processes the control commands from the control system, and then sends control commands to the servo control element. The servo control element is connected to the hydraulic actuator and controls its operation. The feedback element detects the execution result of the hydraulic actuator and feeds the detection result back to the control card, which then sends control commands to the servo control element based on the detection result.

[0007] Preferably, the servo control element is a servo valve or a proportional valve; the number of control cards is two, namely a first control card and a second control card; the first control card and the second control card are redundant, and both the first control card and the second control card are connected to the control system; the number of servo control elements is two, namely a first servo control element and a second servo control element; the first servo control element and the second servo control element are redundant, and both the first servo control element and the second servo control element are connected to the first control card and the second control card to receive signals from the first control card and the second control card; the first servo control element and the second servo control element are both connected to the hydraulic motor to control the operation of the hydraulic motor; the number of feedback elements is two, namely a first feedback element and a second feedback element; the first feedback element and the second feedback element are redundant, and both the first feedback element and the second feedback element are used to detect the execution result of the hydraulic motor and feed the detection result back to the first control card and the second control card.

[0008] Preferably, the first servo control element and the second servo control element can each control the operation of the hydraulic motor independently, or the first servo control element and the second servo control element can control the operation of the hydraulic motor simultaneously.

[0009] Preferably, it also includes a solenoid valve, the oil inlet of which is connected to the oil outlet of the first servo control element and the second servo control element, and the oil outlet of which is connected to the working chamber of the hydraulic motor; the solenoid valve has a dual-path oil control valve position and a single-path oil control valve position, and the solenoid valve is connected to the control system, and the valve position of the solenoid valve is adjusted through the control system.

[0010] Preferably, the feedback element is a stroke sensor used to detect the stroke of the hydraulic motor.

[0011] To achieve the above or other objectives, the present invention also discloses a steam turbine hydraulic regulation and control system, employing the aforementioned steam turbine hydraulic regulation and control block. The steam turbine hydraulic regulation and control block includes a solenoid valve, the oil inlet of which is connected to the oil outlets of a first servo control element and a second servo control element. The oil outlet of the solenoid valve is connected to the working chamber of the hydraulic actuator via a solenoid valve oil outlet pipe. It also includes an oil tank and a return oil main pipe. The oil tank is connected to the oil inlet of the first servo control element and the oil inlet of the second servo control element. The return oil chamber of the hydraulic actuator is connected to the return oil main pipe via a first return oil branch pipe, and the return oil chamber of the hydraulic actuator is connected to the oil tank via the first return oil branch pipe and the return oil main pipe. The return oil port of the first servo control element is connected to the return oil main pipe, and the return oil port of the second servo control element is connected to the second return oil branch pipe.

[0012] Preferably, it also includes a quick-release block, which is used to quickly shut off the oil actuator, thereby quickly closing the steam valve of the steam turbine.

[0013] Preferably, the system also includes a filter and a bypass valve, wherein the oil inlet of the filter is connected to the oil tank; and the bypass valve is arranged in parallel between the oil inlet and the oil outlet of the filter.

[0014] To achieve the above or other objectives, the present invention also discloses a steam turbine, including the steam turbine hydraulic regulation and control block described above.

[0015] To achieve the above or other objectives, the present invention also discloses a steam turbine, including the steam turbine hydraulic regulation and control system described above.

[0016] As described above, the turbine hydraulic regulating control block, control system, and turbine involved in this invention have the following beneficial effects:

[0017] 1. The present invention is provided with a first control card, a second control card, a first servo control element, and a second servo control element. Through the cross control of the first control card and the second control card, the movement of the hydraulic motor can be controlled more precisely. When errors occur during the control process, due to the configuration of dual cards and dual servo control elements, they can correct and compensate for each other, thus achieving high control accuracy.

[0018] 2. In this invention, both the first and second servo control elements are connected to the hydraulic motor. The hydraulic motor can be controlled individually or simultaneously. When one servo control element fails, the other servo control element can quickly compensate for the control loss caused by the failure and continue to maintain the stable operation of the hydraulic motor, thus ensuring high control reliability.

[0019] 3. In this invention, the simultaneous setting of a first servo control element and a second servo control element achieves complementary precision of the servo control elements. The component failures that occur in the control system are automatically judged by the internal logic between the first feedback element, the second feedback element, the first control card, and the second control card, thus achieving a high degree of automation in control.

[0020] 4. In this invention, the first control card and the second control card are redundant, the first servo control element and the second servo control element are redundant, and the first feedback element and the second feedback element are redundant. When one of the two redundant elements fails, the other element can continue to maintain the operation of the control system. The faulty element can be replaced online without stopping the machine for replacement, thus making maintenance highly convenient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the steam turbine hydraulic regulation and control block in this invention;

[0022] Figure 2 This is a schematic diagram of the steam turbine hydraulic regulation and control system in this invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Control system; 2. Control card; 201. First control card; 202. Second control card; 3. Servo control element; 301. First servo control element; 302. Second servo control element; 4. Hydraulic actuator; 401. Working chamber; 402. Return spring; 403. Oil return chamber; 404. Piston rod; 5. Feedback element; 501. First feedback element; 502. Second feedback element; 6. Filter; 7. Bypass valve; 8. First shut-off valve; 9. Second shut-off valve; 10. Third shut-off valve; 11. Fourth shut-off valve; 12. Fifth shut-off valve; 3. Sixth shut-off valve; 14. Solenoid valve; 15. Oil inlet pipe of the first servo control element; 16. Oil inlet pipe of the second servo control element; 17. Oil outlet pipe of the first servo control element; 18. Oil outlet pipe of the second servo control element; 19. Oil outlet pipe of the solenoid valve; 20. First return oil branch pipe; 21. Second return oil branch pipe; 22. Main return oil pipe; 23. First stop solenoid valve; 24. Second stop solenoid valve; 25. Oil inlet pipe of the first stop solenoid valve; 26. Oil inlet pipe of the second stop solenoid valve; 27. First cartridge valve; 28. Second cartridge valve; 29. ​​Third return oil branch pipe. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0026] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0027] like Figure 1 , Figure 2As shown, this invention provides a steam turbine hydraulic regulating control block (hereinafter referred to as the hydraulic regulating control block) for controlling the stroke of the hydraulic motor 4 in a steam turbine. It includes a control system 1, a control card 2, a servo control element 3, and a feedback element 5. The control system 1 is connected to the control card 2, and sends control commands to the control card 2. The control card 2 is connected to the servo control element 3, receives and processes the control commands from the control system 1, and then sends control commands to the servo control element 3. The servo control element 3 is connected to the hydraulic motor 4 and controls its operation. The feedback element 5 detects the execution result of the hydraulic motor 4 and feeds the detection result back to the control card 2. The control card 2 sends control commands to the servo control element 3 based on the detection result. There are two control cards 2, namely a first control card 201 and a second control card 202. The first control card 201 and the second control card 202 are redundant, and the first control card 201 and the second control card 202 are redundant. Both control cards 202 are connected to the control system 1; there are two servo control elements 3, namely the first servo control element 301 and the second servo control element 302; the first servo control element 301 and the second servo control element 302 are redundant, and both the first servo control element 301 and the second servo control element 302 are connected to the first control card 201 and the second control card 202 to receive signals from the first control card 201 and the second control card 202; the first servo control element 301 and the second servo control element 302 are both connected to the hydraulic motor 4 to control the operation of the hydraulic motor 4; there are two feedback elements 5, namely the first feedback element 501 and the second feedback element 502; the first feedback element 501 and the second feedback element 502 are redundant, and both the first feedback element 501 and the second feedback element 502 are used to detect the execution result of the hydraulic motor 4 and feed the detection result back to the first control card 201 and the second control card 202.

[0028] In this invention, the first control card 201 and the second control card 202 are redundant, the first servo control element 301 and the second servo control element 302 are redundant, and the first feedback element 501 and the second feedback element 502 are redundant. Therefore, when one of the redundant components fails, the other component can still support the stable operation of the control system, effectively solving the problems of poor safety and reliability and easy failure of single control oil circuits in the prior art. Accordingly, the number of control cards 2 and the number of servo control elements 3 can be selected according to the actual situation, and can be three, four, etc., to form a multi-redundancy structure.

[0029] Preferred, such as Figure 2As shown, the hydraulic actuator 4 includes a housing, a working chamber 401, a return oil chamber 403, a piston rod 404, and a return spring 402. The working chamber 401 and the return oil chamber 403 are both housed within the housing. The piston rod 404 is disposed within both the working chamber 401 and the return oil chamber 403. The return spring 402 is located at one end of the piston rod 404. The piston rod 404 is connected to a turbine steam valve and is used to adjust the opening degree of the turbine steam valve.

[0030] Preferably, the servo control element 3 is a servo valve or a proportional valve.

[0031] Preferably, in this embodiment, the first servo control element 301 and the second servo control element 302 can each control the hydraulic motor 4 to work independently, or the first servo control element 301 and the second servo control element 302 can control the hydraulic motor 4 to work simultaneously.

[0032] Preferably, in this embodiment, the hydraulic regulating control block further includes a solenoid valve 14. The oil inlet of the solenoid valve 14 is connected to the oil outlets of the first servo control element 301 and the second servo control element 302, and the oil outlet of the solenoid valve 14 is connected to the working chamber 401 of the hydraulic actuator 4. The solenoid valve 14 has a dual-path control valve position and a single-path control valve position. The solenoid valve 14 is communicatively connected to the control system 1, and the valve position of the solenoid valve 14 is adjusted through the control system 1. In this embodiment, when the solenoid valve 14 is switched to the dual-path control valve position, both the first servo control element 301 and the second servo control element 302 supply oil to the hydraulic actuator 4 simultaneously; when the solenoid valve 14 is switched to the single-path control valve position, only one of the first servo control element 301 and the second servo control element 302 supplies oil to the hydraulic actuator 4.

[0033] Preferably, the feedback element 5 is a stroke sensor used to detect the stroke of the hydraulic motor 4 and to provide feedback to the first control card 201 and the second control card 202 based on the stroke of the piston rod 404 in the hydraulic motor 4. In this embodiment, both the control card 2 and the feedback element 5 are communicatively connected to the control system 1, which facilitates the control system to monitor in real time and modify instructions promptly.

[0034] Preferably, the hydraulic regulating control block involved in this application is provided with a control card 2, a servo control element 3, and a feedback element 5, and the number of each of the control card 2, servo control element 3, and feedback element 5 is two. The two control cards 2 can control the servo control element 3 individually or in a cross-control manner. The two servo control elements 3 can control the hydraulic motor 4 individually or in a cross-control manner. The two feedback elements 5 can provide feedback to the control card 2 individually or in a cross-control manner. Therefore, in Figure 1In the control loop shown as “control system 1 → control card 2 → servo control element 3 → hydraulic motor 4 → feedback element 5 → control card 2”, control card 2 has three states (first control card 201 is on, or second control card 202 is on, or both first control card 201 and second control card 202 are on), servo control element 3 has three states (first servo control element 301 is on, or second servo control element 302 is on, or both first servo control element 301 and second servo control element 302 are on), and feedback element 5 has three states (first feedback element 501 is on, or second feedback element 502 is on, or both first feedback element 501 and second feedback element 502 are on).

[0035] In this way, the above control loop can be used to generate several control loops. When a component fails and the control loop cannot be connected, the hydraulic motor 4 can still be controlled through other control loops. This solves the problem that the hydraulic control device of the turbine valve hydraulic motor 4 uses a single control oil circuit, which has poor safety and reliability and is prone to failure.

[0036] Preferably, in this embodiment, the first control card 201 and the second control card 202 have an automatic alarm function to facilitate operators in detecting faults and replacing them. In this application, the first control card 201 and the second control card 202 are redundant. When one of the control cards 2 fails, the faulty control card 2 will automatically alarm, while the other control card 2 can continue to control the loop, ensuring stable control. The operator disconnects the output signal of the faulty control card 2, replaces it with a new card, imports the backup settings of the original card into the new card, and reconnects the output signal. The new card can then work normally, realizing online replacement of the faulty control card 2.

[0037] In this application, the servo control element 3 uses a servo valve. This servo valve has a valve core feedback function, sending a servo valve core position feedback signal to the control system 1 in real time. When the signal value exceeds the normal operating range, an alarm signal is sent. The control system 1 cuts off the corresponding faulty oil circuit according to the alarm signal. At this time, the other oil circuit can still control the hydraulic motor to work normally. The operator can then perform online maintenance on the faulty oil circuit.

[0038] To achieve the above or other objectives, the present invention also discloses a steam turbine hydraulic regulation and control system (hereinafter referred to as the hydraulic regulation and control system), such as... Figure 2As shown, the turbine hydraulic regulating control block described above includes a solenoid valve 14. The oil inlet of the solenoid valve 14 is connected to the oil outlets of the first servo control element 301 and the second servo control element 302. The oil outlet of the solenoid valve 14 is connected to the working chamber 401 of the hydraulic actuator 4 via a solenoid valve oil outlet pipe 19. It also includes an oil tank, a first shut-off valve 8, a second shut-off valve 9, a third shut-off valve 10, a fourth shut-off valve 11, and a return oil main pipe 22. The oil tank is connected to the oil inlet of the first servo control element 301 via a first servo control element oil inlet pipe 15, and the first shut-off valve 8 is mounted on the first servo control element oil inlet pipe 15. The oil tank is connected to the oil inlet of the second servo control element 302 via a second servo control element oil inlet pipe 16, and the second shut-off valve 9 is mounted on the second servo control element oil inlet pipe 16. The oil outlet of the first servo control element 301 is connected to the oil inlet of the solenoid valve 14 via a first servo valve oil outlet pipe 19. The control element is connected to the oil outlet pipe 17, and the third shut-off valve 10 is installed on the oil outlet pipe 17 of the first servo control element; the oil outlet of the second servo control element 302 is connected to the oil inlet of the solenoid valve 14 through the oil outlet pipe 18 of the second servo control element, and the fourth shut-off valve 11 is installed on the oil outlet pipe 18 of the second servo control element; the oil return chamber 403 of the hydraulic motor 4 is connected to the oil return main pipe 22 through the first oil return branch pipe 20, and the oil return chamber 403 of the hydraulic motor 4 is connected to the oil tank through the first oil return branch pipe 20 and the oil return main pipe 22; the oil return port of the first servo control element 301 is connected to the oil return main pipe 22 through the second oil return branch pipe 21, and a fifth shut-off valve 12 is installed between the oil return port of the first servo control element 301 and the second oil return branch pipe 21; the oil return port of the second servo control element 302 is connected to the second oil return branch pipe 21, and a sixth shut-off valve 13 is installed between the oil return port of the second servo control element 302 and the second oil return branch pipe 21.

[0039] Preferred, such as Figure 2 As shown, the hydraulic regulation and control system also includes a quick-release block, which is used to quickly shut off the hydraulic actuator 4, thereby quickly closing the steam valve of the turbine. This embodiment discloses a specific structure of the quick-release block, as follows:

[0040] The rapid pressure relief block includes a first stop solenoid valve 23, a second stop solenoid valve 24, a first cartridge valve 27, and a second cartridge valve 28. The oil inlet of the first stop solenoid valve 23 is connected to the oil tank via a first stop solenoid valve inlet pipe 25, and the oil inlet of the second stop solenoid valve 24 is connected to the oil tank via a second stop solenoid valve inlet pipe 26. The oil outlet of the first stop solenoid valve 23 is connected to the control port of the first cartridge valve 27, and the second stop solenoid valve 28... The oil outlet of the solenoid valve 24 is connected to the control oil port of the second cartridge valve 28; the oil inlet of the first cartridge valve 27 and the oil inlet of the second cartridge valve 28 are both connected to the oil outlet pipe 19 of the solenoid valve; the oil return port of the first cartridge valve 27 and the oil return port of the second cartridge valve 28 are both connected to the oil return chamber 403 of the hydraulic motor 4; the oil return port of the first stop solenoid valve 23 and the oil return port of the second stop solenoid valve 24 are both connected to the main oil return pipe 22 through the third oil return branch pipe 29.

[0041] Preferred, such as Figure 2 As shown, the hydraulic regulating control system also includes a filter 6 and a bypass valve 7. The oil inlet of the filter 6 is connected to the oil tank, and the oil inlet pipes 15 and 16 of the first servo control element are both connected to the oil outlet of the filter 6. The bypass valve 7 is arranged in parallel between the oil inlet and the oil outlet of the filter 6. In this embodiment, the purpose of the bypass valve 7 is to ensure that when the filter 6 is blocked, the pressure at the oil inlet of the filter 6 is greater than the pressure at the oil outlet of the filter 6, and then the hydraulic oil at the oil inlet of the filter 6 opens the bypass valve 7, thereby realizing the delivery of hydraulic oil and ensuring the stable operation of the hydraulic motor 4.

[0042] To facilitate the description of the working principle of the hydraulic regulation and control system, the following is a summary. Figure 2 The hydraulic control process is described below. Both the first servo control element 301 and the second servo control element 302 employ servo valves. The operator follows the instructions in the appendix... Figures 1-2 The above description connects the components; the control flow is as follows:

[0043] 1) Dual-path control of hydraulic motor 4 for operation;

[0044] At this time, the first shut-off valve 8, the second shut-off valve 9, the third shut-off valve 10, the fourth shut-off valve 11, the fifth shut-off valve 12, and the sixth shut-off valve 13 are opened; the solenoid valve 14 is adjusted to the dual-path oil control valve position under the action of the control system 1.

[0045] The hydraulic oil in the tank, after passing through filter 6, splits into two paths. One path enters the inlet (P port) of the first servo control element 301 through the first shut-off valve 8 on the inlet pipe 15 of the first servo control element, then through the outlet (A port) of the first servo control element 301 into the outlet pipe 17 of the first servo control element, and finally through the third shut-off valve 10 into the inlet of the solenoid valve 14. The other path enters the inlet (P port) of the second servo control element 302 through the second shut-off valve 9 on the inlet pipe 16 of the second servo control element, then through the outlet (A port) of the second servo control element 302 into the outlet pipe 18 of the second servo control element, and finally through the fourth shut-off valve 11 into the inlet of the solenoid valve 14.

[0046] Since the solenoid valve 14 is in the dual-path control valve position, both hydraulic oils enter the inlet of the solenoid valve 14, and then enter the working chamber 401 of the hydraulic motor 4 through the outlet of the solenoid valve 14 and the outlet pipe 19 of the solenoid valve. The piston rod 404 moves to the left to adjust the opening of the turbine valve. At this time, the return spring 402 is in a compressed state. The hydraulic oil in the return chamber 403 of the hydraulic motor 4 flows back to the oil tank through the first return branch pipe 20 and the return main pipe 22. The feedback element 5 detects the movement stroke of the piston rod 404.

[0047] 2) Single-path control of hydraulic motor 4 operation;

[0048] At this time, the first shut-off valve 8, the second shut-off valve 9, the third shut-off valve 10, the fourth shut-off valve 11, the fifth shut-off valve 12, and the sixth shut-off valve 13 are opened; the solenoid valve 14 is adjusted to the single-channel oil control valve position under the action of the control system 1.

[0049] The hydraulic oil in the tank, after passing through filter 6, splits into two paths. One path enters the inlet (P port) of the first servo control element 301 through the first shut-off valve 8 on the inlet pipe 15 of the first servo control element, then through the outlet (A port) of the first servo control element 301 into the outlet pipe 17 of the first servo control element, and finally through the third shut-off valve 10 into the inlet of the solenoid valve 14. The other path enters the inlet (P port) of the second servo control element 302 through the second shut-off valve 9 on the inlet pipe 16 of the second servo control element, then through the outlet (A port) of the second servo control element 302 into the outlet pipe 18 of the second servo control element, and finally through the fourth shut-off valve 11 into the inlet of the solenoid valve 14.

[0050] Since the solenoid valve 14 is in the single-path control valve position, only one path of hydraulic oil enters the inlet of the solenoid valve 14 (for example, if the hydraulic oil flowing through the first servo control element 301 enters the inlet of the solenoid valve 14, then the hydraulic oil flowing through the second servo control element 302 is cut off by the solenoid valve 14 and cannot enter the solenoid valve 14; and vice versa). This path of hydraulic oil enters the working chamber 401 of the hydraulic motor 4 through the outlet of the solenoid valve 14 and the outlet pipe 19 of the solenoid valve. The piston rod 404 moves to the left to adjust the opening of the turbine steam valve. At this time, the return spring 402 is in a compressed state. The hydraulic oil in the return chamber 403 of the hydraulic motor 4 flows back to the oil tank through the first return branch pipe 20 and the return main pipe 22. The feedback element 5 detects the movement stroke of the piston rod 404.

[0051] 3) The dual-path control hydraulic actuator 4 malfunctioned;

[0052] When the valve position of the solenoid valve 14 is adjusted to the dual-path oil control valve position, the hydraulic oil flowing through the first servo control element 301 and the second servo control element 302 enters the working chamber 401 of the hydraulic motor 4, and the feedback element 5 detects the expected stroke parameters of the piston rod 404.

[0053] If the first servo control element 301 malfunctions, the amount of hydraulic oil entering the working chamber 401 of the hydraulic motor 4 through the solenoid valve outlet pipe 19 will be abnormal, and the stroke parameters detected by the feedback element 5 will have an error compared with the expected parameters. At this time, the feedback element 5 feeds the parameters back to the control card 2. The control card 2 receives the feedback signal, compares it with the command sent by the control system 1, and then sends a command to the second servo control element 302. By changing the current flowing to the second servo control element 302, the opening degree of the second servo control element 302 is adjusted to compensate for the abnormal flow to the hydraulic motor 4, ensuring that the stroke parameters of the piston rod 404 of the hydraulic motor 4 reach the expected setting.

[0054] Correspondingly, if the second servo control element 302 malfunctions, the amount of hydraulic oil entering the working chamber 401 of the hydraulic motor 4 through the solenoid valve outlet pipe 19 will be abnormal, and the stroke parameters detected by the feedback element 5 will have an error compared with the expected parameters. At this time, the feedback element 5 will feed the parameters back to the control card 2. The control card 2 will receive the feedback signal and compare it with the command sent by the control system 1. After processing, it will send a command to the first servo control element 301. By changing the current flowing to the first servo control element 301, the opening of the first servo control element 301 will be adjusted to compensate for the abnormal flow to the hydraulic motor 4, ensuring that the stroke parameters of the piston rod 404 of the hydraulic motor 4 reach the expected setting.

[0055] 4) The single-channel control hydraulic actuator 4 malfunctioned;

[0056] When the valve position of the solenoid valve 14 is adjusted to the single-channel oil control valve position, the hydraulic oil flowing through the first servo control element 301 or the second servo control element 302 enters the working chamber 401 of the oil motor 4, and the feedback element 5 detects the expected stroke parameters.

[0057] If the oil flow path through the first servo control element 301 is connected to the oil inlet of the solenoid valve 14, and the first servo control element 301 malfunctions, the amount of hydraulic oil entering the working chamber 401 of the hydraulic motor 4 through the solenoid valve outlet pipe 19 will be abnormal. The stroke parameters detected by the feedback element 5 will have an error compared with the expected parameters. At this time, the feedback element 5 will feed the parameters back to the control card 2. After receiving and processing the feedback signal, the control card 2 will communicate with the control system 1. The control system 1 will send a command to the solenoid valve 14. The solenoid valve 14 will immediately disconnect the faulty oil path and immediately start the second servo control element 302 to complete the switching of the control oil path, so that the hydraulic motor 4 can immediately resume normal operation.

[0058] Correspondingly, if the oil flow is connected to the inlet of the solenoid valve 14 through the second servo control element 302, the control process is the same as described above when the second servo control element 302 malfunctions, and will not be repeated here.

[0059] 5) Online replacement of servo control element 3;

[0060] When one of the servo control elements 3 in 3) and 4) above fails, the control card 2 sends a command to the other servo control element 3, or the control system 1 sends a command to the solenoid valve 14, so that the other servo control element 3 can realize the normal operation of the hydraulic motor 4.

[0061] If the first servo control element 301 malfunctions, the first shut-off valve 8, the third shut-off valve 10, and the fifth shut-off valve 12 will be closed to cut off the oil circuit. In this way, the first servo control element 301 can be removed and replaced without affecting the normal operation of the entire control oil circuit.

[0062] Correspondingly, if the second servo control element 302 malfunctions, the second shut-off valve 9, the fourth shut-off valve 11, and the sixth shut-off valve 13 are closed to cut off the oil circuit; in this way, the second servo control element 302 can be removed and replaced without affecting the normal operation of the entire control oil circuit.

[0063] 6) When steps 1)-5) above are running, the rapid pressure relief block is in the closed state;

[0064] The operation in the closed state is as follows: Hydraulic oil enters the inlet of the first stop solenoid valve 23 through the inlet pipe 25 of the first stop solenoid valve. Then, the hydraulic oil enters the control port of the first cartridge valve 27 through the outlet of the first stop solenoid valve 23. At this time, the pressure in the control port of the first cartridge valve 27 is not less than the pressure in the inlet of the first cartridge valve 27, and the inlet and return ports of the first cartridge valve 27 are not connected. In this state, the first cartridge valve 27 is not functioning as a pressure relief valve and is in the closed state.

[0065] Correspondingly, the second cartridge valve 28 operates in the same way as the first cartridge valve 27, and will not be described again here.

[0066] 7) When the oil motor 4 stops in an emergency, the piston rod 404 of the oil motor 4 needs to be reset, thereby driving the steam valve to close. At this time, the quick pressure relief block needs to be opened.

[0067] The working process of the quick pressure relief block in the open state is as follows: hydraulic oil enters the inlet of the first stop solenoid valve 23 through the oil inlet pipe 25 of the first stop solenoid valve, then the oil outlet of the first stop solenoid valve 23 closes and the oil return port of the first stop solenoid valve 23 opens. Since the oil inlet of the first cartridge valve 27 is connected to the oil outlet pipe 19 of the solenoid valve, the pressure in the oil inlet of the first cartridge valve 27 is greater than the pressure in the control oil port of the first cartridge valve 27. The hydraulic oil in the oil inlet of the first cartridge valve 27 will push the first cartridge valve 27 open, and the oil inlet and return port of the first cartridge valve 27 will be connected. The hydraulic oil in the oil inlet of the first cartridge valve 27 flows into the return oil chamber 403 of the hydraulic motor 4, and then flows back to the oil tank through the first return oil branch pipe 20 and the return oil main pipe 22. That is, the pressure in the working chamber 401 and the return oil chamber 403 of the hydraulic motor 4 is the same. Under the action of the return spring 402 of the hydraulic motor 4, the piston rod 404 is reset, thus realizing the rapid closing of the steam turbine valve.

[0068] Correspondingly, the second cartridge valve 28 operates in the same way as the first cartridge valve 27, and will not be described again here.

[0069] To achieve the above or other objectives, the present invention also discloses a steam turbine, including the steam turbine hydraulic regulation and control block described above.

[0070] To achieve the above or other objectives, the present invention also discloses a steam turbine, including the steam turbine hydraulic regulation and control system described above.

[0071] The present invention relates to a turbine hydraulic regulating control block, control system, and turbine. The control card 2, servo control element 3, and feedback element 5 are all redundantly configured, improving the control accuracy and response speed of the hydraulic actuator 4. Simultaneously, the control circuit enables online replacement of the servo control element 3 and control card 2, solving the problems of poor safety and reliability and susceptibility to failure in existing single-control oil circuits. A solenoid valve 14 is provided, positioned behind the oil circuit movement of the first servo control element 301 and the second servo control element 302. When the solenoid valve is activated, it can switch between controlling a single servo control element 3 or simultaneously controlling both servo control elements. The control circuit in this application has an automatic diagnostic function. When the control card 2 malfunctions, the output can be disconnected through the corresponding control circuit, allowing for replacement without shutting down the machine; or when the servo control element 3 malfunctions, the faulty oil circuit can be isolated through the corresponding shut-off valve, also allowing for replacement without shutting down the machine.

[0072] Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A steam turbine hydraulic regulating control block for controlling the stroke of the hydraulic actuator (4) in a steam turbine; characterized in that: The system includes a control system (1), a control card (2), a servo control element (3), and a feedback element (5). The control system (1) is connected to the control card (2) and sends control commands to the control card (2). The control card (2) is connected to the servo control element (3) and receives the control commands from the control system (1), processes the control commands, and then sends control commands to the servo control element (3). The servo control element (3) is connected to the hydraulic motor (4) and is used to control the operation of the hydraulic motor (4). The feedback element (5) is used to detect the execution result of the hydraulic motor (4) and feed the detection result back to the control card (2). The control card (2) sends control commands to the servo control element (3) based on the detection result.

2. The turbine hydraulic regulating control block according to claim 1, characterized in that: The servo control element (3) is a servo valve or a proportional valve; The number of control cards (2) is two, namely a first control card (201) and a second control card (202); the first control card (201) and the second control card (202) are redundant to each other, and both the first control card (201) and the second control card (202) are connected to the control system (1); The number of servo control elements (3) is two, namely a first servo control element (301) and a second servo control element (302); the first servo control element (301) and the second servo control element (302) are redundant to each other, and both the first servo control element (301) and the second servo control element (302) are connected to the first control card (201) and the second control card (202) to receive signals from the first control card (201) and the second control card (202); the first servo control element (301) and the second servo control element (302) are both connected to the hydraulic motor (4) to control the operation of the hydraulic motor (4); The number of feedback elements (5) is two, namely the first feedback element (501) and the second feedback element (502); the first feedback element (501) and the second feedback element (502) are redundant to each other, and the first feedback element (501) and the second feedback element (502) are both used to detect the execution result of the oil motor (4) and feed the detection result back to the first control card (201) and the second control card (202).

3. The turbine hydraulic regulating control block according to claim 2, characterized in that: The first servo control element (301) and the second servo control element (302) can each control the oil motor (4) to work independently, or the first servo control element (301) and the second servo control element (302) can control the oil motor (4) to work simultaneously.

4. The turbine hydraulic regulating control block according to claim 3, characterized in that: It also includes a solenoid valve (14), the oil inlet of which is connected to the oil outlet of the first servo control element (301) and the second servo control element (302), and the oil outlet of which is connected to the working chamber (401) of the oil motor (4); the solenoid valve (14) has a dual-path oil control valve position and a single-path oil control valve position, and the solenoid valve (14) is connected to the control system (1), and the valve position of the solenoid valve (14) is adjusted through the control system (1).

5. The turbine hydraulic regulating control block according to claim 1, characterized in that: The feedback element (5) is a stroke sensor used to detect the stroke of the hydraulic motor (4).

6. A steam turbine hydraulic regulation and control system, employing the steam turbine hydraulic regulation and control block according to any one of claims 1-5, wherein the steam turbine hydraulic regulation and control block includes a solenoid valve (14), the oil inlet of the solenoid valve (14) is connected to the oil outlet of a first servo control element (301) and a second servo control element (302), and the oil outlet of the solenoid valve (14) is connected to the working chamber (401) of the hydraulic actuator (4) through a solenoid valve oil outlet pipe (19); characterized in that: It also includes an oil tank and a return oil main (22), wherein the oil tank is connected to the oil inlet of the first servo control element (301) and the oil inlet of the second servo control element (302); The oil return chamber (403) of the oil motor (4) is connected to the main oil return pipe (22) through the first oil return branch pipe (20), and the oil return chamber (403) of the oil motor (4) is connected to the oil tank through the first oil return branch pipe (20) and the main oil return pipe (22); The oil return port of the first servo control element (301) is connected to the main oil return pipe (22), and the oil return port of the second servo control element (302) is connected to the second oil return branch pipe (21).

7. The turbine hydraulic regulation and control system according to claim 6, characterized in that: It also includes a quick-release block, which is used to quickly shut off the oil actuator (4) so ​​that the steam valve of the steam turbine is quickly closed.

8. The turbine hydraulic regulation and control system according to claim 6, characterized in that: It also includes a filter (6) and a bypass valve (7), wherein the oil inlet of the filter (6) is connected to the oil tank; and the bypass valve (7) is arranged in parallel between the oil inlet and the oil outlet of the filter (6).

9. A steam turbine, characterized in that: Includes the turbine hydraulic regulating control block as described in any one of claims 1-5.

10. A steam turbine, characterized in that: Includes the turbine hydraulic regulation and control system as described in any one of claims 6-8.

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