Abrasion-proof connecting device for LVDT (Linear Variable Differential Transformer) of steam turbine

Abstract

The utility model relates to the technical field of steam turbines, and discloses a steam turbine admission regulating valve LVDT abrasion-proof connecting device which comprises an LVDT mounting plate and a DEH admission regulating valve and further comprises a ball head rod, a connecting ball head and a ball head seat, and a fixing seat is fixedly mounted at the upper end of the LVDT mounting plate; when the connecting device is used, the connecting device has an adjusting freedom degree, and when friction is caused by axial and radial misalignment between the LVDT iron core and the sleeve, the connecting ball head and the ball head seat can rotate, swing and incline smoothly with a very small sphericity gap, so that the abrasion probability is effectively reduced, the durability is improved, and the service life of the LVDT iron core is prolonged. According to the device, lubricating grease can be rapidly injected and automatically blocked when being added, and when the lubricating grease in the rotating inner cavity is reduced, the piston presses the lubricating grease in the lubricating grease storage pipe into the rotating inner cavity, so that the lubricating grease in the rotating inner cavity is automatically supplemented, and the maintenance frequency of the ball cup and the connecting ball head is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine technical field especially relates to steam turbine admission valve LVDT anti-abrasion connecting device. BACKGROUND

[0002] At present, LVDT is used as the feedback mode of DEH admission valve, and is paid much attention to because of its important position in DEH adjustment. The LVDT system itself is not too complex, but it is the feedback link of DEH valve automatic control. LVDT is mainly used for valve position control and display of each admission valve of steam turbine, and each admission valve is the actuator of unit load control, so it is particularly important to ensure the normal work of LVDT.

[0003] At present, the connection mode of LVDT and steam turbine admission valve is that the LVDT sleeve is fixed on the mounting plate, the LVDT core and the valve feedback plate are fixed through nuts, the valve feedback plate is fixed on the admission valve rod connecting rod through bolts, and each connection point is rigidly connected. The advantages of this mode are that the LVDT itself has simple structure, intuitive principle, high sensitivity and resolution, stable and reliable connection points, and accurate valve position feedback. The disadvantages are that in order to respond to the grid regulation demand, each power generation enterprise improves the rapid load change ability of the unit. The rapid change of unit load will require the field control equipment to act more frequently and with large stroke, thus increasing the equipment wear and fatigue of parts. As an important device participating in the load control of steam turbine, LVDT has no adjustment freedom due to the rigid connection of each part, and once local friction occurs, it is easy to be damaged.

[0004] In recent years, the events of unit load fluctuation caused by LVDT failure even non-stop occur from time to time, among which the proportion of mechanical connection part failure is very high, such as connecting rod fracture and LVDT core wear. The main reasons for the fracture and wear are that after the unit starts, due to thermal expansion deformation and other reasons, the LVDT core and the sleeve are out of axis, the LVDT core moves nonlinearly in the axial direction within the stroke range, and the LVDT core and the sleeve are worn. UTILITY MODEL CONTENTS

[0005] In order to overcome the problem that after the unit starts, due to thermal expansion deformation and other reasons, the LVDT core and the sleeve are out of axis, the LVDT core moves nonlinearly in the axial direction within the stroke range, and the LVDT core and the sleeve are worn.

[0006] The utility model discloses a technical scheme for: steam turbine admission valve LVDT anti-abrasion connecting device, including LVDT mounting plate and DEH admission valve, still including ball head rod, connecting ball head and ball head seat, the upper end fixed mounting of LVDT mounting plate has fixed seat, the upper end of fixed seat is equipped with LVDT sleeve, the upper end fixed mounting of fixed seat has fixed ring, LVDT sleeve is fixedly installed on the upper end of fixed seat through fixed ring, the one end of LVDT sleeve is slidably provided with LVDT core, ball head rod is fixedly connected in one end of LVDT core, the one end fixed connection of ball head rod has connecting ball head, the surface sliding connection of connecting ball head has ball head seat, the one end fixed mounting of ball head seat has screw seat, the one end screw joint of screw seat has connecting rod, the one end of connecting rod is equipped with valve feedback board, the surface fixed mounting of valve feedback board has DEH admission valve, the upper end fixed connection of ball head seat has the grease storage pipe of lubricating.

[0007] As preferred, the one end of the connecting rod passes through the valve feedback board, and the surface of the connecting rod is screw-connected with a fixed nut, the valve feedback board is fixedly installed at the one end of the connecting rod through the fixed nut, and the side of the DEH admission valve is fixedly installed with a fixed plate.

[0008] As preferred, the one end surface of the ball head seat is provided with threads, the one end of the ball head seat is screw-connected with a locking nut, the inner side of the locking nut is fixedly connected with a sealing ring, the surface of the sealing ring is attached to the surface of the ball head seat, and the surface of the locking nut is provided with anti-skid lines.

[0009] As preferred, the one end of the ball head seat is internally provided with a rotating inner cavity, the ball head seat is arranged in the rotating inner cavity, the grease storage pipe is fixedly connected to the surface of the ball head seat, and the grease storage pipe is arranged above the rotating inner cavity.

[0010] As preferred, the upper end of the grease storage pipe is fixedly connected with a support frame, the upper end of the grease storage pipe is provided with an opening, the upper end of the grease storage pipe is slidably connected with a filling pipe at the opening, the surface of the filling pipe is provided with a discharging hole, the surface of the filling pipe is sleeved with a spring one, and the spring one is used for upwardly pushing the filling pipe.

[0011] As preferred, the one side of the grease storage pipe is fixedly connected with a side pressurizing pipe, the side pressurizing pipe is slidably connected with a piston, and the one end of the piston is fixedly connected with a pull rod.

[0012] As preferred, the one side of the piston is provided with a spring holder, the surface of the pull rod is sleeved with a spring two, the one end of the side pressurizing pipe is fixedly connected with a clasp, the one end surface of the pull rod is provided with a limiting block, and the surface of the clasp is provided with a notch matched with the limiting block.

[0013] The utility model discloses beneficial effect: when using, the connecting device has the adjustment freedom, when the axial, radial misalignment of LVDT core and sleeve appears and causes the friction, the connecting ball head and the ball head seat can carry out the smooth rotation swing and the inclination movement with the very small spherical degree gap, thereby effectively reducing the wear and tear probability, improve the durability, the device can be injected fast when adding the lubricating grease, and the automatic completion is blocked, when the lubricating grease in the rotary inner chamber reduces, the piston will press the lubricating grease in the lubricating grease storage pipe into the rotary inner chamber, like this has completed the automatic replenishment of the lubricating grease in the rotary inner chamber, greatly reduced the maintenance frequency of ball head seat and connecting ball head. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model discloses a three -dimensional structure schematic diagram of LVDT sleeve is shown.

[0015] Figure 2 The utility model discloses a three -dimensional structure schematic diagram of connecting ball head is shown.

[0016] Figure 3 The utility model discloses a three -dimensional structure schematic diagram of sealing ring is shown.

[0017] Figure 4 The utility model discloses a three -dimensional structure schematic diagram of fixed nut is shown.

[0018] Figure 5 The utility model discloses a three -dimensional structure schematic diagram of support frame is shown.

[0019] Figure 6 The utility model discloses a three -dimensional structure schematic diagram of spring two is shown.

[0020] Figure 7 The utility model discloses a three -dimensional structure schematic diagram of pull rod is shown.

[0021] Mark explanation: 1, LVDT mounting plate;2, fixed seat;3, fixed ring;4, LVDT sleeve;5, LVDT core;6, ball head rod;7, connecting ball head;8, ball head seat;9, rotary inner chamber;10, locking nut;11, sealing ring;12, threaded seat;13, connecting rod;14, valve feedback board;15, fixed nut;16, DEH inlet air regulating valve;17, fixed plate;18, lubricating grease storage pipe;19, support frame;20, injection pipe;21, spring one;22, side pressurizing pipe;23, piston;24, spring clamp seat;25, pull rod;26, limit block;27, buckle;28, discharge hole;29, spring two. DETAILED DESCRIPTION

[0022] The utility model will be further explained below in combination with the drawings and examples.

[0023] Please refer to Figure 1- Figure 7 The utility model provides an embodiment: turbine admission valve LVDT anti -wear connecting device, including LVDT mounting plate 1 and DEH admission valve 16, still including ball head rod 6, connecting ball head 7 and ball head seat 8, the upper end fixed mounting of LVDT mounting plate 1 has fixed seat 2, the upper end of fixed seat 2 is equipped with LVDT sleeve 4, the upper end fixed mounting of fixed seat 2 has fixed ring 3, LVDT sleeve 4 is fixedly installed on the upper end of fixed seat 2 through fixed ring 3, one end of LVDT sleeve 4 is slidably provided with LVDT core 5, ball head rod 6 is fixedly connected in one end of LVDT core 5, one end of ball head rod 6 is fixedly connected with connecting ball head 7, the surface of connecting ball head 7 is slidably connected with ball head seat 8, one end of ball head seat 8 is fixedly installed with threaded seat 12, one end of threaded seat 12 is threadedly connected with connecting rod 13, one end of connecting rod 13 is equipped with valve feedback plate 14, the surface of valve feedback plate 14 is fixedly installed with DEH admission valve 16, the upper end of ball head seat 8 is fixedly connected with lubricating grease storage pipe 18, one end of connecting rod 13 passes through valve feedback plate 14, the surface of connecting rod 13 is threadedly connected with fixed nut 15, valve feedback plate 14 is fixedly installed at one end of connecting rod 13 through fixed nut 15, one side of DEH admission valve 16 is fixedly installed with fixed plate 17, the surface of one end of ball head seat 8 is equipped with screw thread, one end of ball head seat 8 is threadedly connected with locking nut 10, the inboard of locking nut 10 is fixedly connected with sealing ring 11, the surface of sealing ring 11 is attached to the surface of ball head seat 8, the surface of locking nut 10 is equipped with antiskid line, when using, LVDT mounting plate 1 and LVDT sleeve 4 are all fixedly unmoved, DEH admission valve 16 drives valve feedback plate 14 to move, LVDT in LVDT sleeve 4 is used to detect the actual position of DEH admission valve 16 and will actual valve position feedback to DEH system, when valve feedback plate 14 swings or the friction between LVDT sleeve 4 and LVDT core 5 occurs, ball head seat 8 and connecting ball head 7 can be rectified through the rotation swing or the oblique motion pull rod 25, eliminate friction, can reduce the wear and tear probability of LVDT, effectively improve the durability.

[0024] Please refer to Figure 5 - Figure 7In the embodiment, the one end of the ball head seat 8 is provided with a rotating inner cavity 9, the ball head seat 8 is arranged in the rotating inner cavity 9, the lubricating grease storage pipe 18 is fixedly connected to the surface of the ball head seat 8, the lubricating grease storage pipe 18 is arranged above the rotating inner cavity 9, the upper end of the lubricating grease storage pipe 18 is fixedly connected with a support frame 19, the upper end of the lubricating grease storage pipe 18 is provided with an opening, the upper end of the lubricating grease storage pipe 18 is slidably connected with a filling pipe 20, the surface of the filling pipe 20 is provided with a discharging hole 28, the surface of the filling pipe 20 is sleeved with a spring 21, the spring 21 is used for pushing the filling pipe 20 upward, one side of the lubricating grease storage pipe 18 is fixedly connected with a side pressurizing pipe 22, the side pressurizing pipe 22 is slidably connected with a piston 23, one end of the piston 23 is fixedly connected with a pull rod 25, one side of the piston 23 is provided with a spring clamping seat 24, the surface of the pull rod 25 is sleeved with a spring 29, one end of the side pressurizing pipe 22 is fixedly connected with a buckle 27, one end surface of the pull rod 25 is provided with a limiting block 26, the surface of the buckle 27 is provided with a notch matched with the limiting block 26, the lubricating grease is injected into the rotating inner cavity 9 through the lubricating grease storage pipe 18, when the lubricating grease needs to be added, the connecting pipe filled with the lubricating grease is inserted into the filling pipe 20, the filling pipe 20 is forced to descend, the discharging hole 28 provided on the surface of the filling pipe 20 enters the lubricating grease storage pipe 18, the lubricating grease is discharged from the discharging hole 28 and then enters the lubricating grease storage pipe 18 and then enters the rotating inner cavity 9, the lubricating grease adding is completed, under the action of the spring 21, the filling pipe 20 returns to the original position, the filling pipe 20 blocks the upper end opening of the lubricating grease storage pipe 18, after the lubricating grease adding is completed, the pull rod 25 is rotated, the limiting block 26 provided on the surface of the pull rod 25 is matched with the notch provided on the surface of the buckle 27, under the action of the spring 29, when the lubricating grease in the rotating inner cavity 9 is reduced, the piston 23 pressurizes the lubricating grease in the lubricating grease storage pipe 18 into the rotating inner cavity 9, in this way, the automatic supplement of the lubricating grease in the rotating inner cavity 9 is completed, the maintenance frequency of the ball head seat 8 and the connecting ball head 7 is further greatly reduced.

[0025] The upper end of the LVDT mounting plate 1 is fixedly installed with a fixed seat 2, the LVDT sleeve 4 is fixedly installed on the upper end of the fixed seat 2 through the fixed ring 3, in use, the LVDT mounting plate 1 and the LVDT sleeve 4 are fixedly immovable, the DEH inlet regulating valve 16 drives the valve feedback plate 14 to move, the fixed plate 17 is used for installing the DEH inlet regulating valve 16, the ball head seat 8 is fixedly installed on one side of the valve feedback plate 14 through the threaded seat 12, the connecting rod 13 and the fixed nut 15, the valve feedback plate 14 drives the ball head rod 6 and the LVDT core 5 to move through the ball head seat 8, the LVDT in the LVDT sleeve 4 is used for detecting the actual position of the DEH inlet regulating valve 16 and feeding back the actual valve position to the DEH system, when the valve feedback plate 14 swings or the friction between the LVDT sleeve 4 and the LVDT core 5 occurs, the ball head seat 8 and the connecting ball head 7 can be corrected through the rotary swing or the inclined movement of the pull rod 25, the friction is eliminated, the wear probability of the LVDT is reduced, and the durability is effectively improved.

[0026] The fixed nut 15 is used to fix the valve feedback plate 14 to prevent it from swinging when moving. The locking nut 10 is used to connect the locking ball head seat 8 and the connecting ball head 7. The inner side of the locking nut 10 is provided with a sealing ring 11 which is in close contact with the surface of the connecting ball head 7 to play a sealing role, reducing the amount of lubricating grease discharged from the rotating inner cavity 9 of the ball head seat 8, thereby reducing the maintenance frequency of the ball head seat 8 and the connecting ball head 7.

[0027] The lubricating grease is injected into the rotating inner cavity 9 through the lubricating grease storage pipe 18. When the lubricating grease needs to be added, the connecting pipe filled with lubricating grease is inserted into the injection pipe 20. The injection pipe 20 is forced to descend. The discharge hole 28 on the surface of the injection pipe 20 enters the lubricating grease storage pipe 18. The lubricating grease is discharged from the discharge hole 28 and enters the lubricating grease storage pipe 18 and then enters the rotating inner cavity 9. After the lubricating grease is added, the injection pipe 20 returns to the original position under the action of the spring 21. The discharge hole 28 returns to the outside of the lubricating grease storage pipe 18. The injection pipe 20 blocks the upper end opening of the lubricating grease storage pipe 18 to prevent dust and other foreign matters from entering the lubricating grease storage pipe 18. In this way, the lubricating grease can be quickly injected, and the plugging is automatically completed.

[0028] After the lubricating grease is added, the rotating pull rod 25 is rotated so that the limiting block 26 on the surface of the pull rod 25 is matched and coincides with the notch on the surface of the clasp 27. Under the action of the spring 29, one side of the piston 23 is pressed. When the amount of lubricating grease in the rotating inner cavity 9 decreases, the piston 23 moves in the side pressing pipe 22 to press the lubricating grease in the lubricating grease storage pipe 18 into the rotating inner cavity 9. In this way, the automatic replenishment of the lubricating grease in the rotating inner cavity 9 is completed, and the maintenance frequency of the ball head seat 8 and the connecting ball head 7 is greatly reduced. Therefore, the connecting ball head 7 and the ball head seat 8 can smoothly rotate, swing and tilt with a very small spherical gap, effectively reducing the wear probability and improving the durability.

[0029] Through the above steps, the connecting device has the adjustment freedom when in use. When the axial and radial misalignment between the LVDT core 5 and the sleeve causes friction, the connecting ball head 7 and the ball head seat 8 can smoothly rotate, swing and tilt with a very small spherical gap, thereby effectively reducing the wear probability and improving the durability. When the amount of lubricating grease in the rotating inner cavity 9 decreases, the automatic replenishment of the lubricating grease in the rotating inner cavity 9 greatly reduces the maintenance frequency of the ball head seat 8 and the connecting ball head 7.

Claims

1. A turbine inlet regulating valve LVDT anti-wear connection device, comprising an LVDT mounting plate (1) and a DEH inlet regulating valve (16); characterized in that: It also includes a ball head (6), a connecting ball head (7), and a ball head seat (8). A fixed seat (2) is fixedly installed on the upper end of the LVDT mounting plate (1). An LVDT sleeve (4) is provided on the upper end of the fixed seat (2). A fixed ring (3) is fixedly installed on the upper end of the fixed seat (2). The LVDT sleeve (4) is fixedly installed on the upper end of the fixed seat (2) through the fixed ring (3). An LVDT core (5) is slidably provided on one end of the LVDT sleeve (4). The ball head (6) is fixedly connected to the LVDT core (5). 5) One end of the ball head rod (6) is fixedly connected to a connecting ball head (7), and a ball head seat (8) is slidably connected to the surface of the connecting ball head (7). A threaded seat (12) is fixedly installed at one end of the ball head seat (8), and a connecting rod (13) is threadedly connected to one end of the threaded seat (12). A valve feedback plate (14) is provided at one end of the connecting rod (13), and a DEH intake regulating valve (16) is fixedly installed on the surface of the valve feedback plate (14). A grease reservoir (18) is fixedly connected to the upper end of the ball head seat (8).

2. The anti-wear connection device for the steam turbine inlet regulating valve LVDT according to claim 1, characterized in that: One end of the connecting rod (13) passes through the valve feedback plate (14), and a fixing nut (15) is threaded onto the surface of the connecting rod (13). The valve feedback plate (14) is fixedly installed on one end of the connecting rod (13) by the fixing nut (15), and a fixing plate (17) is fixedly installed on one side of the DEH intake regulating valve (16).

3. The anti-wear connection device for the turbine inlet regulating valve LVDT according to claim 2, characterized in that: One end of the ball head seat (8) is threaded, and a locking nut (10) is threaded to one end of the ball head seat (8). A sealing ring (11) is fixedly connected to the inner side of the locking nut (10). The surface of the sealing ring (11) fits against the surface of the ball head seat (8). The surface of the locking nut (10) is provided with anti-slip texture.

4. The anti-wear connection device for the turbine inlet regulating valve LVDT according to claim 3, characterized in that: A rotating inner cavity (9) is provided at one end of the ball head seat (8). The ball head seat (8) is located in the rotating inner cavity (9). The grease reservoir (18) is fixedly connected to the surface of the ball head seat (8) and is located above the rotating inner cavity (9).

5. The anti-wear connection device for the turbine inlet regulating valve LVDT according to claim 4, characterized in that: A support frame (19) is fixedly connected to the upper end of the grease reservoir (18). The upper end of the grease reservoir (18) has an opening. An injection tube (20) is slidably connected to the upper opening of the grease reservoir (18). The surface of the injection tube (20) has a discharge hole (28). A spring (21) is sleeved on the surface of the injection tube (20). The spring (21) is used to push the injection tube (20) upward.

6. The anti-wear connection device for the turbine inlet regulating valve LVDT according to claim 5, characterized in that: A side pressure pipe (22) is fixedly connected to one side of the grease reservoir (18), and a piston (23) is slidably connected inside the side pressure pipe (22). A pull rod (25) is fixedly connected to one end of the piston (23).

7. The anti-wear connection device for the turbine inlet regulating valve LVDT according to claim 6, characterized in that: A spring seat (24) is provided on one side of the piston (23), a spring (29) is sleeved on the surface of the pull rod (25), a buckle (27) is fixedly connected to one end of the side pressure tube (22), a limit block (26) is provided on the surface of one end of the pull rod (25), and a notch that matches the limit block (26) is provided on the surface of the buckle (27).

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