Electric drive type steam turbine main throttle valve adjustment execution equipment

Abstract

The invention provides electric drive type steam turbine main throttle valve adjustment execution equipment, and relates to the technical field of steam turbine parts, the electric drive type steam turbine main throttle valve adjustment execution equipment comprises a main throttle valve shell, a rotary guide frame is hinged to the front of the main throttle valve shell, and a quick adjustment threaded push cylinder is installed in the center of the bottom in a rotary guide frame body; the main steam valve of the steam turbine adopts an electric component as execution equipment of the main steam valve, on-off control of the main steam valve is achieved, electric energy is directly converted into mechanical energy, the corresponding speed is increased, a transmission structure is simplified, the failure rate is reduced, and the problem that a complex hydraulic system is needed when a valve element of the main steam valve is controlled in a traditional hydraulic driving mode is solved. The problems of high failure rate, high maintenance cost and easiness in causing faults such as oil leakage and the like and high maintenance cost due to the fact that pneumatic driving needs a stable air source and is low in precision and difficult to meet the requirement of high-precision adjustment exist, and the problems of high failure rate, high maintenance cost and easiness in causing out-of-control of a valve core of a main steam valve when power failure, oil leakage and air leakage accidents occur in the operation process are also solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine components, and particularly to an electric drive type steam turbine main steam valve regulating actuator device. Background Art

[0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work. It is mainly used as a prime mover for power generation and can also directly drive various pumps, fans, compressors, and ship propellers. The main steam valve is an important component of the steam turbine and is used to control the steam inlet volume, thereby regulating the rotational speed and power of the steam turbine. The traditional steam turbine main steam valve generally uses a hydraulic cylinder or a pneumatic cylinder as an actuator device to drive the main steam valve spool to expand and contract to control the opening and closing of the main steam valve.

[0003] Using the traditional hydraulic drive method to control the main steam valve spool requires a complex hydraulic system, which is prone to failures such as oil leakage, and has a high maintenance cost. The pneumatic drive requires a stable gas source, has low precision, and is difficult to meet the requirements of high-precision regulation. It also has problems such as high failure rate and high maintenance cost. When power outages, oil leakage, and air leakage accidents occur during operation, it is easy to cause the out-of-control of the main steam valve spool. For the traditional electric control method, while ensuring that the volume of the driving member is small and convenient for combination with the steam turbine, it is difficult to ensure that the small-volume driving member has both a high response speed and an execution force at the same time. Summary of the Invention

[0004] The present invention provides an electric drive type steam turbine main steam valve regulating actuator device to solve the problems that using the traditional hydraulic drive method to control the main steam valve spool requires a complex hydraulic system, is prone to failures such as oil leakage, and has a high maintenance cost; the pneumatic drive requires a stable gas source, has low precision, is difficult to meet the requirements of high-precision regulation, also has problems such as high failure rate and high maintenance cost, and is easy to cause the out-of-control of the main steam valve spool when power outages, oil leakage, and air leakage accidents occur during operation; for the traditional electric control method, while ensuring that the volume of the driving member is small and convenient for combination with the steam turbine, it is difficult to ensure that the small-volume driving member has both a high response speed and an execution force at the same time.

[0005] The present invention provides a power-driven main steam valve regulating and actuating device for a steam turbine, which specifically includes: a main steam valve housing, a rotating guide frame is hinged in front of the main steam valve housing, and a quick-adjusting threaded push cylinder is installed at the center of the bottom inside the frame of the rotating guide frame; a quick-adjusting sliding frame, which is movably connected inside the rotating guide frame, and both edges of the quick-adjusting sliding frame are respectively slidably connected to the guide frame chutes on the inner walls of the rotating guide frame. A sliding frame connecting beam is fixedly connected to the center of the quick-adjusting sliding frame, and the push rod of the quick-adjusting threaded push cylinder is connected to the sliding frame connecting beam; an actuating fine-tuning motor, which is installed inside the quick-adjusting sliding frame by bolts. A reducer is fixedly connected above the quick-adjusting sliding frame by bolts. The rotating shaft of the actuating fine-tuning motor is connected to the input shaft of the reducer through a coupling; the top of the output shaft of the reducer is connected to a fine-tuning lead screw through a coupling. A valve stem is installed inside the main steam valve housing, and a driving rod is hinged outside the valve stem. A compensation connecting rod is hinged behind the main steam valve housing. The upper end of the compensation connecting rod is hinged to the rear end of the driving rod, and the front end of the driving rod is hinged to a threaded push block, and the threaded push block is in screw transmission with the fine-tuning lead screw. An energy storage battery is fixedly connected in front of the rotating guide frame, and the energy storage battery is electrically connected to the quick-adjusting threaded push cylinder and the actuating fine-tuning motor through electric wires.

[0006] Further, a valve stem limiting guide cylinder is fixedly connected to the top of the main steam valve housing. The valve stem vertically penetrates and is slidably connected to the valve stem limiting guide cylinder. A limiting chute is opened on the side of the valve stem limiting guide cylinder, and the hinged rod of the driving rod and the valve stem is slidably connected in the limiting chute.

[0007] Further, a horizontal chute is opened inside the sliding frame connecting beam, and two limiting ejector rods are slidably connected inside the horizontal chute.

[0008] Further, the horizontal chute horizontally penetrates the quick-adjusting sliding frame. A rectangular connecting beam chute is vertically penetrated and opened at the center top of the horizontal chute, and a circular connecting beam guide hole is vertically penetrated at the center bottom of the horizontal chute. Two push plate guide openings are opened at the bottom of the horizontal chute.

[0009] Further, two limiting sockets are respectively opened on the inner walls of the two guide frame chutes inside the rotating guide frame, and the outer ends of the limiting ejector rods are inserted into the limiting sockets.

[0010] Further, a floating support block is fixedly connected to the upper end of the push rod of the quick-adjusting threaded push cylinder. A support block wedge surface is opened on the outer lower edge of the floating support block, and the floating support block is slidably connected in the connecting beam chute.

[0011] Further, a quick-adjusting push ring is fixedly connected to the outside of the push rod of the quick-adjusting threaded push cylinder. The quick-adjusting push ring is located below the sliding frame connecting beam, and the push rod of the quick-adjusting threaded push cylinder is slidably connected to the connecting beam guide hole.

[0012] Further, a wedge-shaped top rod wedge head is provided at the inner end of the limiting ejector rod, and the inclined surface of the top rod wedge head is attached to the support block wedge surface.

[0013] Further, a push rod push plate is fixedly connected to the lower surface of the limit push rod. The push rod push plate is slidably connected to the push plate guide opening. The push rod push plate is fixedly connected with a reset push spring, and the other end of the reset push spring is fixedly connected to the inner wall of the quick adjustment sliding frame.

[0014] The present invention provides a power-driven main steam valve regulating actuator for a steam turbine, which has the following beneficial effects: In the present invention, the main steam valve of the steam turbine uses electric components as the actuator of the main steam valve. The quick adjustment screw cylinder and the actuating fine adjustment motor cooperate to push the driving rod to rotate, so that the driving rod controls the telescopic movement of the valve stem in the main steam valve housing, realizes the on-off control of the main steam valve, directly converts electric energy into mechanical energy, improves the response speed, simplifies the transmission structure, and reduces the failure rate. When there are situations such as unstable voltage or power failure, the quick adjustment screw cylinder and the actuating fine adjustment motor can be temporarily controlled by the energy storage battery to close the steam turbine, avoiding the out-of-control of the main steam valve of the steam turbine during power failure.

[0015] In addition, through the cooperation of the quick adjustment screw cylinder and the actuating fine adjustment motor, the main steam valve of the steam turbine has two different actuating modes. The quick adjustment screw cylinder can quickly push the quick adjustment sliding frame to move up and down, so that the fine adjustment lead screw quickly moves up and down, controls the up and down swing of the driving rod to control the quick telescopic movement of the valve stem, and can be used to quickly shorten the ineffective stroke or the rough adjustment of the main steam valve, and is suitable for quick response adjustment. Through the cooperation of the actuating fine adjustment motor, the reducer, the fine adjustment lead screw and the threaded push block, the actuating fine adjustment motor is decelerated by the reducer to increase the transmission ratio and the torque acting on the fine adjustment lead screw. Through the screw drive of the fine adjustment lead screw with precise threads and the threaded push block, precise control of the driving rod is realized, and at the same time, the control force on the valve stem is increased, which is suitable for the high-precision slow adjustment of the main steam valve. Through the cooperation and combination of the quick adjustment screw cylinder, the actuating fine adjustment motor and a series of transmission structures in the present application, the regulating actuator of the main steam valve is formed. While ensuring that the volume of the driving part is small and convenient for combination with the steam turbine, it also has high response speed, execution precision and execution force at the same time.

[0016] In addition, a limit push rod is arranged inside the quick adjustment sliding frame. When the quick adjustment sliding frame is completely retracted inside the main steam valve housing, under the action of the floating support block, the limit push rod is pushed to act, and the outer end of the limit push rod is inserted into the limit socket to realize the limit of the quick adjustment sliding frame, firmly lock the quick adjustment sliding frame inside the rotating guide frame, avoid excessive pulling force on the quick adjustment screw cylinder during the process of tightening the valve stem, increase wear and even damage, and play a compressive protection role for the quick adjustment screw cylinder. When the quick adjustment screw cylinder pushes the quick adjustment sliding frame to move up again, the floating support block is separated from the push rod wedge head, and the limit push rod automatically retracts inside the horizontal chute under the action of the reset push spring, so that the quick adjustment sliding frame is longitudinally slid and adjusted inside the rotating guide frame under the control of the quick adjustment screw cylinder. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0018] The accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the accompanying drawings: Figure 1 A schematic diagram showing the overall structure of the present application is shown; Figure 2 A schematic diagram showing the structure of the left rear of the present application is shown; Figure 3 Shows the present application Figure 1 The left view structure schematic diagram; Figure 4 A schematic diagram showing the structure inside the rotating guide frame of the present application is shown; Figure 5 Shows the present application Figure 4 The front view structure schematic diagram; Figure 6 A schematic diagram showing the structure of the present application in the retracted state of the limit ejector rod is shown; Figure 7 Shows the present application Figure 6 The front view structure schematic diagram; Figure 8 A schematic diagram showing the structure of the present application in the state where the valve stem moves upward is shown; Figure 9 A schematic diagram showing the structure inside the rotating guide frame and the quick adjustment slide when the main steam valve of the present application is in the open state is shown; Figure 10 A schematic diagram showing the structure when the rotating guide frame and the quick adjustment slide of the present application are separated is shown; Figure 11 A schematic diagram showing the structure of the quick adjustment slide of the present application is shown; Figure 12 A schematic diagram showing the structure of the limit ejector rod of the present application is shown; Figure 13 A schematic diagram showing the structure of the drive rod of the present application is shown; Figure 14 Shows the present application Figure 1 The partial enlarged structure schematic diagram at position A; Figure 15 Shows the present application Figure 1 The partial enlarged structure schematic diagram at position B.

[0020] Reference numerals: 1. Main steam valve housing; 101. Valve stem limit guide cylinder; 2. Rotary guide frame; 201. Guide frame chute; 202. Limit socket; 3. Quick adjustment threaded push cylinder; 301. Floating support block; 302. Support block wedge surface; 303. Quick adjustment push ring; 4. Quick adjustment sliding frame; 401. Sliding frame connecting beam; 402. Horizontal chute; 403. Connecting beam chute; 404. Connecting beam guide hole; 405. Push plate guide port; 5. Limit ejector rod; 501. Ejector rod wedge head; 502. Ejector rod push plate; 503. Reset push spring; 6. Execution fine adjustment motor; 7. Reducer; 8. Fine adjustment lead screw; 9. Drive rod; 901. Threaded push block; 902. Compensation connecting rod; 10. Valve stem; 11. Energy storage battery. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1: Please refer to Figures 1 to 15 : The present invention provides an electric drive regulating actuator for the main steam valve of a steam turbine, comprising: a main steam valve housing 1, with a rotating guide frame 2 hinged in front of the main steam valve housing 1, and a quick-adjusting threaded push cylinder 3 installed at the center of the bottom inside the frame of the rotating guide frame 2; a quick-adjusting sliding frame 4, movably connected inside the rotating guide frame 2, and both edges of the quick-adjusting sliding frame 4 are respectively slidably connected to the guide frame chutes 201 on the inner wall of the rotating guide frame 2. A sliding frame connecting beam 401 is fixedly connected to the center of the quick-adjusting sliding frame 4, and the push rod of the quick-adjusting threaded push cylinder 3 is connected to the sliding frame connecting beam 401; an execution fine-tuning motor 6, installed inside the quick-adjusting sliding frame 4 by bolts, and a speed reducer 7 is fixedly connected above the quick-adjusting sliding frame 4 by bolts. The rotating shaft of the execution fine-tuning motor 6 is connected to the input shaft of the speed reducer 7 through a coupling; the top of the output shaft of the speed reducer 7 is connected to a fine-tuning lead screw 8 through a coupling. A valve stem 10 is installed inside the main steam valve housing 1, a driving rod 9 is hinged outside the valve stem 10, a compensation connecting rod 902 is hinged behind the main steam valve housing 1, the upper end of the compensation connecting rod 902 is hinged to the rear end of the driving rod 9, and a threaded push block 901 is hinged to the front end of the driving rod 9. The threaded push block 901 is in screw drive with the fine-tuning lead screw 8; when the quick-adjusting threaded push cylinder 3, the execution fine-tuning motor 6 and the speed reducer 7 cooperate to control the downward movement of the threaded push block 901, the front end of the driving rod 9 swings downward, the valve stem 10 is squeezed downward through the driving rod 9, and the driving rod 9 is offset compensated through the compensation connecting rod 902, thereby driving the valve stem 10 to move vertically into the main steam valve housing 1 to close the steam turbine. On the contrary, when the quick-adjusting threaded push cylinder 3 pushes the quick-adjusting sliding frame 4 upward or the fine-tuning lead screw 8 rotates to push the threaded push block 901 upward, the front end of the driving rod 9 moves upward, causing the valve stem 10 to move upward inside the main steam valve housing 1 to control the opening of the main steam valve of the steam turbine. The quick-adjusting threaded push cylinder 3 and the execution fine-tuning motor 6 are both controlled by electric energy, directly converting electric energy into mechanical energy, which can improve the response speed and reduce the failure rate.

[0023] With the cooperation of the quick-adjusting threaded push cylinder 3 and the fine-tuning motor 6, the main steam valve of the steam turbine has two different execution modes. The quick-adjusting threaded push cylinder 3 can quickly push the quick-adjusting carriage 4 up and down, so that the fine-tuning screw rod 8 quickly moves up and down, controlling the up and down swing of the driving rod 9 to control the quick telescopic movement of the valve stem 10 of the valve. It can be used to quickly shorten the ineffective stroke or roughly adjust the main steam valve, and is suitable for quick response adjustment. Through the cooperation of the fine-tuning motor 6, the reducer 7, the fine-tuning screw rod 8 and the threaded block 901, the reducer 7 decelerates the fine-tuning motor 6 to increase the transmission ratio and the torque acting on the fine-tuning screw rod 8. Through the screw drive of the fine-tuning screw rod 8 with precise threads and the threaded block 901, precise control of the driving rod 9 is achieved, and at the same time, the control force on the valve stem 10 of the valve is increased, which is suitable for the high-precision slow adjustment of the main steam valve. Through the cooperation of the quick-adjusting threaded push cylinder 3, the fine-tuning motor 6 and a series of transmission structures in this application, an adjustment execution mechanism of the main steam valve is formed. While ensuring that the driving part has a high response speed, execution accuracy and execution force, it maintains a small volume and is convenient for combination with the steam turbine.

[0024] In the embodiment of the present disclosure, a valve stem limit guide cylinder 101 is fixedly connected to the top of the main steam valve housing 1. The valve stem 10 of the valve vertically penetrates and is slidably connected to the valve stem limit guide cylinder 101. A limit chute is provided on the side of the valve stem limit guide cylinder 101. The driving rod 9 and the valve stem 10 of the valve are hinged and slidably connected in the limit chute. The valve stem limit guide cylinder 101 plays a guiding role, and at the same time, through the sliding connection of the hinge rod and the limit chute, a limiting effect is achieved to prevent the valve stem 10 of the valve from detaching from the main steam valve housing 1.

[0025] In the embodiment of the present disclosure, an energy storage battery 11 is fixedly connected in front of the rotating guide frame 2. The energy storage battery 11 is electrically connected to the quick-adjusting threaded push cylinder 3 and the fine-tuning motor 6 through electric wires. The energy storage battery 11 is in a parallel state with the quick-adjusting threaded push cylinder 3 and the fine-tuning motor 6. During normal operation, the energy storage battery 11 stores energy. When power is cut off, the energy storage battery 11 temporarily supplies power to the quick-adjusting threaded push cylinder 3 and the fine-tuning motor 6 to maintain the state of the main steam valve, or provides electrical energy for them to act and close the main steam valve of the steam turbine, avoiding the phenomenon of the main steam valve of the steam turbine getting out of control when power is cut off.

[0026] In the embodiment of the present disclosure, a horizontal chute 402 is provided inside the carriage connecting beam 401. Two limiting ejector rods 5 are slidably connected inside the horizontal chute 402. The horizontal chute 402 horizontally penetrates through the quick-adjusting carriage 4. A connecting beam chute 403 with a rectangular structure is vertically penetrated and opened at the top center of the horizontal chute 402. A connecting beam guide hole 404 with a circular hole structure is vertically penetrated and opened at the bottom center of the horizontal chute 402. Two push plate guide openings 405 are provided at the bottom of the horizontal chute 402. Two limiting socket openings 202 are respectively provided on the inner walls of the two guide chute 201 inside the rotating guide frame 2. The outer ends of the limiting ejector rods 5 are inserted into the limiting socket openings 202. The upper end of the push rod of the quick-adjusting threaded push cylinder 3 is fixedly connected with a floating support block 301. A support block wedge surface 302 is provided at the outer lower edge of the floating support block 301. The floating support block 301 is slidably connected in the connecting beam chute 403. A quick-adjusting push ring 303 is fixedly connected to the outside of the push rod of the quick-adjusting threaded push cylinder 3. The quick-adjusting push ring 303 is located below the carriage connecting beam 401. The push rod of the quick-adjusting threaded push cylinder 3 is slidably connected to the connecting beam guide hole 404; during the process of pushing the quick-adjusting carriage 4 upward by the quick-adjusting threaded push cylinder 3, the quick-adjusting push ring 303 fits against the lower surface of the carriage connecting beam 401, and the quick-adjusting carriage 4 is pushed upward by the quick-adjusting push ring 303. When the quick-adjusting threaded push cylinder 3 contracts and applies a downward pulling force to the quick-adjusting carriage 4, the floating support block 301 moves downward, and the floating support block 301 fits against the lower surface of the carriage connecting beam 401. The floating support block 301 moves downward to apply a downward thrust to the quick-adjusting carriage 4, causing the quick-adjusting carriage 4 to contract inwardly into the rotating guide frame 2.

[0027] Embodiment 2, on the basis of Embodiment 1, a wedge-shaped structure of the ejector rod wedge head 501 is provided at the inner end of the limiting ejector rod 5. The inclined surface of the ejector rod wedge head 501 fits against the support block wedge surface 302; a push plate of the ejector rod 502 is fixedly connected to the lower surface of the limiting ejector rod 5. The push plate of the ejector rod 502 is slidably connected to the push plate guide opening 405. The push plate of the ejector rod 502 is fixedly connected with a return push spring 503. The other end of the return push spring 503 is fixedly connected to the inner wall of the quick-adjusting carriage 4; when the quick-adjusting carriage 4 is completely retracted inside the main steam valve housing 1, under the action of the floating support block 301, the limiting ejector rod 5 is pushed to act, controlling the outer end of the limiting ejector rod 5 to be inserted into the limiting socket opening 202, realizing the limitation of the quick-adjusting carriage 4, firmly locking the quick-adjusting carriage 4 inside the rotating guide frame 2, avoiding excessive pulling force on the quick-adjusting threaded push cylinder 3 during the process of tightening the valve stem 10 of the steam valve, increasing wear and even damage, and playing a compressive protection role for the quick-adjusting threaded push cylinder 3. When the quick-adjusting carriage 4 is pushed upward again by the quick-adjusting threaded push cylinder 3, the floating support block 301 is disengaged from the ejector rod wedge head 501, and the limiting ejector rod 5 automatically retracts inside the horizontal chute 402 under the action of the return push spring 503, releasing the locking of the quick-adjusting carriage 4 inside the quick-adjusting carriage 4, so that the quick-adjusting threaded push cylinder 3 can control the quick-adjusting carriage 4 to continue to act.

[0028] Working principle of this embodiment: First, when controlling the closing of the main steam valve of the steam turbine, control the fast-adjusting threaded push cylinder 3 to contract, and contract the fast-adjusting carriage 4 downward to the bottom inside the rotating guide 2, so that the bottom of the fast-adjusting carriage 4 fits against the inner bottom surface of the rotating guide 2. As the fast-adjusting threaded push cylinder 3 continues to contract, continuously pull down the floating support block 301, so that the support block wedge surface 302 fits against and squeezes the inclined surface of the ejector rod wedge head 501, pushing the limit ejector rod 5 to move outward, so that the outer end of the limit ejector rod 5 is inserted into the limit socket 202 and held, locking the fast-adjusting carriage 4. Through the downward movement of the fast-adjusting carriage 4, the front end of the driving rod 9 is quickly pressed down by a certain distance, and the valve stem 10 is prompted to quickly contract by a certain distance, realizing the rapid adjustment of the valve stem 10 in the first half stage. At this time, control the execution of the fine-tuning motor 6 to rotate. Under the deceleration and pressurization of the reducer 7, drive the fine-tuning lead screw 8 to rotate, and slowly drive the driving rod 9 to rotate downward through the screw drive between the precision thread outside the fine-tuning lead screw 8 and the thread push block 901, further finely advancing the valve stem 10, which is suitable for the high-precision slow adjustment of the main steam valve of the steam turbine and ensures that a strong pressure is applied to the valve stem 10 to avoid leakage of the main steam valve. When controlling the opening of the main steam valve, start the execution of the fine-tuning motor 6 in the opposite rotation direction, and control the valve stem 10 to slowly move upward in the same transmission manner. Control the action of the fast-adjusting threaded push cylinder 3 to make the push rod of the fast-adjusting threaded push cylinder 3 move upward. As the floating support block 301 moves upward, the ejector rod wedge head 501 is separated from the floating support block 301. Under the action of the reset push spring 503, the limit ejector rod 5 is pushed and contracted into the horizontal chute 402, so that the limit ejector rod 5 is separated from the limit socket 202, releasing the positioning of the fast-adjusting carriage 4, and making the fast-adjusting carriage 4 move upward through the contact between the fast-adjusting push ring 303 and the bottom of the carriage connecting beam 401, pushing the fine-tuning lead screw 8 and the thread push block 901 to move upward as a whole, so that the main steam valve quickly opens, having two execution modes of slow fine-tuning and fast corresponding adjustment of the main steam valve. If a power failure occurs, the energy storage battery 11 can provide power for the fast-adjusting threaded push cylinder 3 and the execution of the fine-tuning motor 6, and control the fast-adjusting threaded push cylinder 3 and the execution of the fine-tuning motor 6 to temporarily take over the power supply to maintain the state of the main steam valve, or provide electrical energy for it to act and close the main steam valve of the steam turbine, avoiding the phenomenon of the main steam valve of the steam turbine getting out of control during a power failure.

[0029] In this article, the following points need to be noted: 1. The attached drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0030] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0031] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A power-driven main steam valve regulating and actuating device for a steam turbine, comprising: Main steam valve housing (1), characterized in that a rotating guide frame (2) is hinged in front of the main steam valve housing (1), and a quick-adjusting threaded push cylinder (3) is installed at the center of the bottom inside the frame of the rotating guide frame (2); a quick-adjusting slide frame (4) is movably connected inside the rotating guide frame (2), and the two edges of the quick-adjusting slide frame (4) are respectively slidably connected to the guide frame chutes (201) on the inner wall of the rotating guide frame (2). A slide frame connecting beam (401) is fixedly connected to the center of the quick-adjusting slide frame (4), and the push rod of the quick-adjusting threaded push cylinder (3) is connected to the slide frame connecting beam (401); an execution fine-tuning motor (6) is installed inside the quick-adjusting slide frame (4) by bolts. A speed reducer (7) is fixedly connected above the quick-adjusting slide frame (4) by bolts. The rotating shaft of the execution fine-tuning motor (6) is connected to the input shaft of the speed reducer (7) through a coupling; the top of the output shaft of the speed reducer (7) is connected to a fine-tuning lead screw (8) through a coupling. A valve stem (10) is installed inside the main steam valve housing (1), and a driving rod (9) is hinged outside the valve stem (10). A compensation connecting rod (902) is hinged behind the main steam valve housing (1). The upper end of the compensation connecting rod (902) is hinged to the rear end of the driving rod (9). The front end of the driving rod (9) is hinged to a threaded push block (901). The threaded push block (901) is in screw drive with the fine-tuning lead screw (8). A storage battery (11) is fixedly connected in front of the rotating guide frame (2), and the storage battery (11) is electrically connected to the quick-adjusting threaded push cylinder (3) and the execution fine-tuning motor (6) through electric wires.

2. The electric drive type main steam valve regulating and actuating device according to claim 1, characterized in that, A valve stem limiting guide cylinder (101) is fixedly connected to the top of the main steam valve housing (1). The valve stem (10) vertically penetrates and is slidably connected to the valve stem limiting guide cylinder (101). A limiting chute is provided on the side of the valve stem limiting guide cylinder (101). The hinged rod of the driving rod (9) and the valve stem (10) is slidably connected in the limiting chute.

3. The electric drive type main steam valve regulating and actuating device according to claim 1, characterized in that, A horizontal chute (402) is provided inside the slide frame connecting beam (401), and two limiting ejector rods (5) are slidably connected inside the horizontal chute (402).

4. The electric drive type main steam valve regulating actuator device according to claim 3, characterized in that, The horizontal chute (402) horizontally penetrates the quick-adjusting slide frame (4). A rectangular-structured connecting beam chute (403) is vertically penetrated and opened at the center top of the horizontal chute (402). A circular-hole-structured connecting beam guide hole (404) is vertically penetrated at the center bottom of the horizontal chute (402). Two push plate guide openings (405) are provided at the bottom of the horizontal chute (402).

5. The electric drive type main steam valve regulating actuator device according to claim 1, characterized in that, Two limiting sockets (202) are respectively provided on the inner walls of the two guide frame chutes (201) inside the rotating guide frame (2), and the outer ends of the limiting ejector rods (5) are inserted into the limiting sockets (202).

6. The electric drive type main steam valve regulating actuator device according to claim 4, characterized in that, The upper end of the push rod of the quick-adjusting threaded push cylinder (3) is fixedly connected with a floating support block (301). A support block wedge surface (302) is provided on the outer lower edge of the floating support block (301). The floating support block (301) is slidably connected in the connecting beam chute (403).

7. An electric drive type main steam valve regulating actuator device for a steam turbine according to claim 4, characterized in that, The push rod of the quick-adjusting threaded push cylinder (3) is fixedly connected with a quick-adjusting push ring (303) on the outside. The quick-adjusting push ring (303) is located below the carriage connecting beam (401). The push rod of the quick-adjusting threaded push cylinder (3) is slidably connected to the connecting beam guide hole (404).

8. The electric drive type main steam valve regulating actuator device according to claim 6, characterized in that, The inner end of the limit ejector rod (5) is provided with an ejector rod wedge head (501) with a wedge-shaped structure. The inclined surface of the ejector rod wedge head (501) is in contact with the support block wedge surface (302).

9. The electric drive type main steam valve regulating actuator device according to claim 4, characterized in that, The lower surface of the limit ejector rod (5) is fixedly connected with an ejector rod push plate (502). The ejector rod push plate (502) is slidably connected to the push plate guide opening (405). The ejector rod push plate (502) is fixedly connected with a return push spring (503). The other end of the return push spring (503) is fixedly connected to the inner wall of the quick-adjusting carriage (4).

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