Turbine blade vibration detection device

Abstract

The utility model belongs to the technical field of steam turbine blade vibration detection, and particularly relates to a steam turbine blade vibration detection device, which comprises a base, a support frame is mounted on the base, an electromagnetic induction type vibration sensor is mounted on the support frame, a first screw rod is rotatably mounted in a rotating seat, a clamping block is assembled in a groove, and a second screw rod is mounted in the groove. The middle of the first lead screw is fixedly sleeved with a worm gear, a worm is rotationally installed in the rotating base, a positioning ring is installed on the rotating base through threads, an impeller is placed on the rotating base, blades are installed on the impeller, and the positioning ring and the rotating base can be matched to clamp the impeller in the horizontal direction. And then the two groups of clamping blocks are matched to clamp and fix the inner wall of the impeller, so that the impeller is clamped in the vertical direction, the structure can perform double clamping and fixing on the impeller in the horizontal and vertical directions, the impeller is prevented from shaking, the stability of the impeller is favorably improved, and the vibration detection effect is favorably improved.

Description

Technical Field

[0001] This utility model relates to the field of turbine blade vibration detection technology, specifically a turbine blade vibration detection device. Background Technology

[0002] Turbine blades are one of the key components of a steam turbine. They are subjected to the combined effects of high temperature, high pressure, huge centrifugal force, steam force, steam excitation force, corrosion and vibration, as well as water droplet erosion in the wet steam zone under extremely harsh conditions. During the blade manufacturing stage, it is necessary to conduct quality inspections on various performance aspects, and vibration performance testing is one of them. Therefore, vibration testing devices are required to test the vibration performance of the blades.

[0003] A Chinese patent with announcement number CN 117629385 B discloses a turbine impeller vibration performance testing device, relating to the field of impeller vibration performance testing technology. The device includes: a base, with a motor fixedly installed on the right end face of the support block b, and the motor shaft fixedly connected to a drive shaft; through the pressing action of a power failure warning switch and a rubber pressure block, the motor's operating status can be monitored in real time. When the motor loses power due to a fault, without the magnetic attraction of an electromagnet, the top of the rubber pressure block will press against the power failure warning switch due to the reset inertia of the reset spring a, thus immediately alerting the staff so they can proceed promptly. This solves the problem that devices used for testing impeller vibration performance generally use motors to drive the impeller at high speed, but if the motor malfunctions, the staff cannot be notified in time, resulting in a significant waste of testing time.

[0004] Existing vibration detection devices require clamping and fixing the impeller during vibration detection of turbine blades. However, due to the inability to stably clamp the impeller, it is prone to shaking during detection, resulting in poor vibration detection results. Therefore, a turbine blade vibration detection device is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve the problems existing in the existing technology, this utility model proposes a turbine blade vibration detection device.

[0006] The technical solution adopted by this utility model to solve its technical problem is a turbine blade vibration detection device, including a base, a support frame mounted on the base, an electromagnetic induction vibration sensor mounted on the support frame, a motor mounted on the support frame via a base, a rotating seat mounted on the output shaft of the motor, the rotating seat being rotatably connected to the support frame, a first lead screw rotatably mounted inside the rotating seat, the thread direction of the first lead screw being symmetrical and opposite, two sets of grooves symmetrically formed inside the rotating seat, clamping blocks being assembled in the grooves, the clamping blocks being sleeved around the first lead screw and slidingly engaging with the first lead screw through thread, the first lead screw being fixed in the middle. A worm gear is fitted onto the rotating seat, and a worm is rotatably mounted inside the rotating seat. The worm meshes with the worm gear, and a first knob is mounted on the worm. Threads are formed on the outer wall of the rotating seat, and a positioning ring is threaded onto the rotating seat. An impeller with blades is placed on the rotating seat. The positioning ring engages with the rotating seat to clamp the impeller horizontally. Subsequently, two sets of clamping blocks engage to clamp and fix the inner wall of the impeller, achieving vertical clamping of the impeller. This structure can provide dual clamping and fixation of the impeller in both horizontal and vertical directions, preventing impeller wobbling, improving impeller stability, and enhancing vibration detection effectiveness.

[0007] Preferably, a control console is mounted on the base. The control console is connected to an electromagnetic induction vibration sensor via an internal circuit. A sliding groove is formed on the base, and a second lead screw is rotatably mounted on the inner wall of the sliding groove. A second knob is mounted on the second lead screw. A slider is assembled inside the sliding groove. The slider is sleeved around the second lead screw and slides with the second lead screw through a thread. A sliding frame is mounted on the slider, and a sliding plate is mounted on the sliding frame. A cavity is formed inside the sliding plate, and multiple nozzles are mounted on the sliding plate. A gas guide pipe is mounted on the sliding plate. The impeller drives the blades to rotate, and steam is sprayed onto the high-speed rotating blades, which effectively simulates the temperature and pressure changes experienced by the blades during actual operation. The electromagnetic induction vibration sensor sends the detected electrical signal to the control console, and the control console obtains the vibration parameters of the blades, such as vibration frequency, damping, and mode shape, which helps to improve the accuracy of vibration detection.

[0008] The advantages of this utility model are:

[0009] 1. This utility model uses a positioning ring that works with a rotating seat to clamp the impeller horizontally, and then two sets of clamping blocks work together to clamp and fix the inner wall of the impeller, thus achieving vertical clamping of the impeller. This structure can clamp and fix the impeller in both horizontal and vertical directions, preventing the impeller from shaking, improving the stability of the impeller, and enhancing the effect of vibration detection.

[0010] 2. This invention uses an impeller to drive the blades to rotate, while steam is sprayed onto the high-speed rotating blades, effectively simulating the temperature and pressure changes experienced by the blades during actual operation. The electromagnetic induction vibration sensor sends the detected electrical signal to the control console, which obtains the vibration parameters such as the blade's vibration frequency, damping, and mode shape, thus improving the accuracy of vibration detection. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a first-person perspective 3D structural diagram;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the rotating seat cross-section;

[0014] Figure 3 This is a three-dimensional structural diagram of the worm gear.

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure at the positioning ring.

[0016] Figure 5 This is a schematic diagram of the three-dimensional structure of the nozzle.

[0017] In the diagram: 1. Base; 2. Support frame; 3. Electromagnetic induction vibration sensor; 4. Motor; 5. Rotating seat; 6. First lead screw; 7. Groove; 8. Clamping block; 9. Worm gear; 10. Worm; 11. First knob; 12. Positioning ring; 13. Impeller; 14. Blade; 15. Control console; 16. Slide groove; 17. Second lead screw; 18. Second knob; 19. Slider; 20. Sliding frame; 21. Sliding plate; 22. Nozzle; 23. Air guide pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Please see Figure 1-4As shown, a turbine blade vibration detection device includes a base 1, a support frame 2 mounted on the base 1, an electromagnetic induction vibration sensor 3 mounted on the support frame 2, a motor 4 mounted on the support frame 2 via a base, a rotating seat 5 mounted on the output shaft of the motor 4, the rotating seat 5 being rotatably connected to the support frame 2, a first lead screw 6 rotatably mounted inside the rotating seat 5, the threads on the first lead screw 6 being symmetrically opposite, two sets of grooves 7 symmetrically formed inside the rotating seat 5, clamping blocks 8 fitted inside the grooves 7, the clamping blocks 8 being sleeved around the first lead screw 6 and slidingly engaging with the first lead screw 6 via threads, a worm gear 9 fixedly sleeved in the middle of the first lead screw 6, and a worm 10 rotatably mounted inside the rotating seat 5, the worm 10 and the worm gear 9 being connected. The worm gear 10 is meshed with each other, and a first knob 11 is installed on the worm gear 10. The outer wall of the rotating seat 5 is threaded, and a positioning ring 12 is installed on the rotating seat 5 through the thread. An impeller 13 is placed on the rotating seat 5, and blades 14 are installed on the impeller 13. During operation, the existing vibration detection device needs to clamp and fix the impeller 13 during the vibration detection of the turbine blades 14. Since it is impossible to clamp the impeller 13 stably, the impeller 13 is prone to shaking during the detection, resulting in poor vibration detection effect. By placing the impeller 13 on the rotating seat 5 and screwing the positioning ring 12 on the thread of the rotating seat 5, the positioning ring 12 will cooperate with the rotating seat 5 to clamp the impeller 13 in the horizontal direction.

[0020] Then, turning the first knob 11 causes the worm gear 10 to rotate, which in turn drives the worm wheel 9 to rotate. The combination of the worm wheel 9 and the worm gear 10 has a self-locking property. The worm wheel 9 drives the first lead screw 6 to rotate, and the first lead screw 6 drives the two sets of clamping blocks 8 on it to move synchronously in opposite directions. The two sets of clamping blocks 8 cooperate to clamp and fix the inner wall of the impeller 13, thereby achieving vertical clamping of the impeller 13. This structure can clamp and fix the impeller 13 in both horizontal and vertical directions, preventing the impeller 13 from shaking, which is beneficial to improving the stability of the impeller 13 and improving the effect of vibration detection.

[0021] Please see Figure 5As shown, a control console 15 is mounted on the base 1. The control console 15 is connected to the electromagnetic induction vibration sensor 3 via an internal circuit. A slide groove 16 is provided on the base 1. A second lead screw 17 is rotatably mounted on the inner wall of the slide groove 16. A second knob 18 is mounted on the second lead screw 17. A slider 19 is assembled inside the slide groove 16. The slider 19 is sleeved around the second lead screw 17 and slides with the second lead screw 17 through a thread. A sliding frame 20 is mounted on the slider 19. A sliding plate 21 is mounted on the sliding frame 20. A cavity is provided inside the sliding plate 21. There are multiple nozzles 22, and a guide pipe 23 is installed on the sliding plate 21. During operation, the existing vibration detection device cannot effectively simulate the temperature and pressure changes experienced by the turbine blade 14 during actual operation, resulting in poor accuracy of vibration detection. By rotating the second knob 18, the second lead screw 17 is rotated, which in turn drives the slider 19 on it to move horizontally. The slider 19 drives the sliding frame 20 to move horizontally, which in turn drives the sliding plate 21 to move horizontally. The sliding plate 21 then drives the nozzles 22 to move horizontally. The movement causes the nozzle 22 to face the blade 14. Then, the motor 4 operates, driving the rotating seat 5 to rotate. The rotating seat 5 drives the impeller 13 clamped on it to rotate, and the impeller 13 drives the blade 14 to rotate. At the same time, steam is introduced into the air guide pipe 23. Then, the steam is sprayed out from multiple nozzles 22 and sprayed onto the high-speed rotating blade 14, realizing the effective simulation of the temperature and pressure changes of the blade 14 during actual operation. During this process, the electromagnetic induction vibration sensor 3 operates. The electromagnetic induction vibration sensor 3 is model SZ-4. The principle of the electromagnetic induction vibration sensor 3 is that the sensor contains magnetic material or coil. When the object vibrates, it will drive the magnetic material or coil inside the sensor to generate relative motion with respect to another part, thereby changing the magnetic flux or the current in the coil, and thus generating an electrical signal. The electromagnetic induction vibration sensor 3 sends the detected electrical signal to the control console 15. The control console 15 obtains the vibration parameters of the blade 14, such as vibration frequency, damping, and mode shape, so as to provide a scientific basis for the production and manufacturing of the blade 14, improve the yield rate, prevent unqualified products from flowing out, and improve the accuracy of vibration detection.

[0022] Working principle: Existing vibration detection devices require clamping and fixing the impeller 13 during vibration detection of turbine blades 14. Because the impeller 13 cannot be stably clamped, it easily shakes during detection, resulting in poor vibration detection results. By placing the impeller 13 on the rotating seat 5 and screwing the positioning ring 12 onto the threads of the rotating seat 5, the positioning ring 12 cooperates with the rotating seat 5 to clamp the impeller 13 horizontally. Then, rotating the first knob 11 drives the worm gear 10 to rotate, which in turn drives the worm wheel 9 to rotate. The worm wheel 9 then drives the first lead screw 6 to rotate, which in turn drives the... The two sets of clamping blocks 8 move synchronously in opposite directions, and cooperate to clamp and fix the inner wall of the impeller 13, achieving vertical clamping of the impeller 13. This structure can clamp and fix the impeller 13 in both horizontal and vertical directions, preventing the impeller 13 from shaking, which is beneficial to improving the stability of the impeller 13 and improving the vibration detection effect. The existing vibration detection device cannot effectively simulate the temperature and pressure changes of the turbine blade 14 during actual operation, resulting in poor vibration detection accuracy. By rotating the second knob 18, the second lead screw 17 is driven to rotate. The two lead screws 17 drive the slider 19 on it to move horizontally. The slider 19 drives the sliding frame 20 to move horizontally, the sliding frame 20 drives the sliding plate 21 to move horizontally, and the sliding plate 21 drives the nozzle 22 to move horizontally, so that the nozzle 22 faces the blade 14. Then, the motor 4 operates, driving the rotating seat 5 to rotate. The rotating seat 5 drives the impeller 13 clamped on it to rotate, and the impeller 13 drives the blade 14 to rotate. At the same time, steam is introduced into the air guide pipe 23. Then, the steam is ejected from multiple nozzles 22 and sprayed onto the high-speed rotating blade 14, realizing an effective simulation of the temperature and pressure changes experienced by the blade 14 during actual operation. The electromagnetic induction vibration sensor 3 operates on the principle that the sensor contains magnetic material or a coil. When an object vibrates, it causes the magnetic material or coil inside the sensor to move relative to another part, thereby changing the magnetic flux or the current in the coil, and thus generating an electrical signal. The electromagnetic induction vibration sensor 3 sends the detected electrical signal to the control console 15. The control console 15 obtains the vibration parameters of the blade 14, such as vibration frequency, damping, and mode shape, so as to provide a scientific basis for the production and manufacturing of the blade 14, improve the yield rate, prevent unqualified products from flowing out, and improve the accuracy of vibration detection.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A turbine blade vibration detection device, characterized in that: The device includes a base (1), on which a support frame (2) is mounted. An electromagnetic induction vibration sensor (3) is mounted on the support frame (2). A motor (4) is mounted on the support frame (2) via a base. A rotating seat (5) is mounted on the output shaft of the motor (4). The rotating seat (5) is rotatably connected to the support frame (2). A first lead screw (6) is rotatably mounted inside the rotating seat (5). The thread directions on the first lead screw (6) are symmetrical and opposite. Two sets of grooves (7) are symmetrically opened inside the rotating seat (5). Clamping blocks (8) are assembled in the grooves (7). The clamping block (8) is sleeved around the first lead screw (6) and slides with the first lead screw (6) through threads. A worm wheel (9) is fixedly sleeved in the middle of the first lead screw (6). A worm (10) is rotatably installed inside the rotating seat (5). The worm (10) meshes with the worm wheel (9). A first knob (11) is installed on the worm (10). A thread is opened on the outer wall of the rotating seat (5). A positioning ring (12) is installed on the rotating seat (5) through threads. An impeller (13) is placed on the rotating seat (5). Blades (14) are installed on the impeller (13).

2. The turbine blade vibration detection device according to claim 1, characterized in that: A control console (15) is mounted on the base (1), and the control console (15) is connected to the electromagnetic induction vibration sensor (3) through an internal circuit.

3. The turbine blade vibration detection device according to claim 1, characterized in that: The base (1) has a groove (16) and a second lead screw (17) is rotatably mounted on the inner wall of the groove (16). A second knob (18) is mounted on the second lead screw (17).

4. The turbine blade vibration detection device according to claim 3, characterized in that: The slide groove (16) is equipped with a slider (19), which is sleeved around the second lead screw (17) and slides with the second lead screw (17) through a thread.

5. The turbine blade vibration detection device according to claim 4, characterized in that: A sliding frame (20) is mounted on the slider (19), and a sliding plate (21) is mounted on the sliding frame (20).

6. The turbine blade vibration detection device according to claim 5, characterized in that: The sliding plate (21) has a cavity inside, and multiple nozzles (22) are installed on the sliding plate (21). An air guide pipe (23) is installed on the sliding plate (21).

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