A steam turbine low-pressure cylinder blade health monitoring and data acquisition device

Abstract

The utility model relates to steam turbine blade monitoring technical field discloses a steam turbine low pressure cylinder blade health monitoring and data acquisition device, including the pivot and sensor, the outer wall on the pivot is fixed with the steam turbine low pressure cylinder blade, still includes: low pressure cylinder component, convenient dismounting mechanism, convenient dismounting mechanism sets up on low pressure cylinder component, convenient dismounting mechanism is used for on low pressure cylinder component to the position adjustable mechanism carries out detachable installation. The utility model discloses the design through convenient dismounting mechanism, if need to maintain sensor, first mounting seat is through the state of the mode of dials and is removed locking on low pressure cylinder component, then mounting seat is drawn apart to the direction of being away from low pressure cylinder component, can drive sensor, need not from the inside of low pressure cylinder component to sensor dismounting, the external operation space is big, and the tool is convenient to use, and the dismounting speed is faster, and the equipment downtime is shorter, and the convenience of maintenance work is improved.

Description

Technical Field

[0001] This utility model relates to the field of turbine blade monitoring technology, specifically to a turbine low-pressure cylinder blade health monitoring and data acquisition device. Background Technology

[0002] The blade health monitoring system can monitor the amplitude, frequency, and clearance of the last-stage moving blades in low-pressure turbines in real time. Through finite element numerical analysis and simulation, the relationship between the dynamic stress distribution on the blade surface and the blade amplitude is obtained. By monitoring the blade amplitude in real time, the dynamic stress of the blade can be monitored in real time. If any of the above parameters exceeds the limit, the system can issue an alarm to remind operators to adjust the operating conditions to avoid risks. Blade flutter is a major safety hazard of steam turbine equipment. It is not only prone to occur when the low-pressure cylinder is cut off, but it can also occur when the steam turbine is operating at low load and when the extraction condensing unit is operating with a large steam extraction volume. Therefore, it has been given attention by Shanghai Electric Power Plant even before the advent of low-pressure cylinder cut-off technology. They have focused on achieving real-time monitoring of the vibration of the last-stage blades, identifying dangerous operating conditions that easily induce blade flutter, and plotting back pressure limit curves under small volume flow rates to help power plants avoid these conditions in future operations.

[0003] Traditional monitoring and data acquisition devices typically use sensors that are fixedly mounted on the inner wall of a low-pressure cylinder to monitor the condition of the blades. These sensors require maintenance during use, which necessitates removing them from the inside of the low-pressure cylinder, making maintenance work inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide a health monitoring and data acquisition device for the low-pressure cylinder blades of a steam turbine, which solves the problem that the existing technology of installing sensors inside the cylinder body makes maintenance work inconvenient.

[0005] This utility model provides the following technical solution: a health monitoring and data acquisition device for low-pressure cylinder blades of a steam turbine, comprising a rotating shaft and a sensor, wherein low-pressure cylinder blades of a steam turbine are fixedly installed on the outer wall of the rotating shaft, and further comprising: Low-pressure cylinder components; A convenient disassembly and assembly mechanism is provided on the low-pressure cylinder component, and the convenient disassembly and assembly mechanism is used to detachably install the position adjustable mechanism on the low-pressure cylinder component; An adjustable position mechanism is provided on a convenient disassembly and assembly mechanism, and the adjustable position mechanism is used to adjust and fix the position of the sensor. The convenient disassembly and assembly mechanism includes a limiting component, which is fixedly connected to the outer wall of the low-pressure cylinder component. The limiting component has a through hole on its side, and the outer wall of the low-pressure cylinder component has a circular hole. A mounting base is movably inserted into the inner cavity of the limiting component. A circular block is fixedly connected to the outer wall of the mounting base. The circular block is movably inserted into the inner cavity of the circular hole. A rubber ring is fixedly fitted onto the outer wall of the circular block, and the rubber ring movably abuts against the inner wall of the circular hole.

[0006] The sensor can be driven by pulling the mounting base away from the low-pressure cylinder components, thanks to the convenient disassembly and assembly mechanism, which improves the ease of maintenance.

[0007] As a preferred embodiment of the above technical solution, both ends of the low-pressure cylinder component are fixedly connected to flanges, and the rotating shaft and the turbine low-pressure cylinder blades are located in the inner cavity of the low-pressure cylinder component.

[0008] As a preferred embodiment of the above technical solution, a groove is provided on the outer wall of the mounting base, and a sliding pin is slidably connected to the inner wall of the groove, the sliding pin being movably inserted into the inside of the through hole.

[0009] The groove design makes it easy to store structures such as sliding pins.

[0010] As a preferred embodiment of the above technical solution, an elastic element is fixedly installed on the outer wall of the sliding pin, and the end of the elastic element away from the sliding pin is fixedly connected to the inner wall of the groove. A handle is fixedly installed on the outer wall of the sliding pin.

[0011] The handle design makes it easy for users to operate the sliding pin.

[0012] As a preferred embodiment of the above technical solution, the position adjustable mechanism includes a square tube, which is fixedly installed on the side of the circular block away from the mounting base, and a reinforcing foot is welded between the circular block and the square tube.

[0013] The reinforced feet design allows for reinforcement of the connection between the square tube and the round block.

[0014] As a preferred embodiment of the above technical solution, an inner column is slidably connected to the inner cavity of the square tube, and a bolt is threadedly connected to the outer wall of the square tube. The end of the bolt is movably abutted against the outer wall of the inner column, and a scale line is provided on the outer wall of the inner column.

[0015] The design of the inner column allows for adjustment of the distance between the sensor and the turbine's low-pressure cylinder blades, facilitating installation and commissioning.

[0016] As a preferred embodiment of the above technical solution, a connecting plate is fixedly installed at the bottom of the inner column, a connecting arm is fixedly installed on the outer wall of the connecting plate, and a second scale line is provided on the outer wall of the connecting arm.

[0017] The design of the second scale line and the aforementioned first scale line provides auxiliary markings for adjustment, improving the accuracy of the adjustment.

[0018] As a preferred embodiment of the above technical solution, a slider is slidably connected to the outer wall of the connecting arm, a second bolt is threadedly connected to the outer wall of the slider, the end of the second bolt is movably abutting against the outer wall of the connecting arm, and the sensor is detachably connected to the outer wall of the slider.

[0019] The slider design allows for adjustment of the sensor's axial position relative to the turbine's low-pressure cylinder blades, facilitating installation and commissioning.

[0020] Compared with the prior art, the beneficial effects of this utility model are: This utility model features a convenient disassembly and assembly mechanism. When the sensor needs maintenance, the mounting base can be released from its locked position on the low-pressure cylinder component by turning it. Then, the mounting base can be pulled away from the low-pressure cylinder component to move the sensor. There is no need to disassemble or assemble the sensor from the inside of the low-pressure cylinder component. The external operating space is large, the tools are easy to use, the disassembly and assembly speed is faster, the equipment downtime is shorter, the convenience of maintenance work is improved, the equipment downtime loss is reduced, and it is more economical in the long run. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a schematic diagram of the structure of the mounting base and the circular block of this utility model; Figure 3 This is a schematic diagram of the structure of the mounting base of this utility model; Figure 4 This is a schematic diagram of the position-adjustable mechanism of this utility model.

[0022] In the diagram: 1. Low-pressure cylinder component; 11. Rotating shaft; 12. Turbine low-pressure cylinder blade; 13. Flange; 2. Convenient disassembly and assembly mechanism; 21. Limiting component; 22. Through hole; 23. Round hole; 24. Mounting base; 241. Groove; 242. Sliding pin; 243. Elastic component; 244. Handle; 25. Circular block; 26. Rubber ring; 3. Position adjustable mechanism; 31. Square tube; 32. Reinforcing foot; 33. Inner column; 34. Bolt No. 1; 35. Scale line No. 1; 36. Connecting plate; 37. Connecting arm; 38. Scale line No. 2; 39. Slider; 391. Bolt No. 2; 392. Sensor. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] like Figures 1-4 As shown, this utility model provides a technical solution: a steam turbine low-pressure cylinder blade health monitoring and data acquisition device, including a rotating shaft 11 and a sensor 392, wherein a steam turbine low-pressure cylinder blade 12 is fixedly installed on the outer wall of the rotating shaft 11, and further includes: Low-pressure cylinder component 1; Easy disassembly and assembly mechanism 2 is installed on the low-pressure cylinder component 1. Easy disassembly and assembly mechanism 2 is used to detachably install the position adjustable mechanism 3 on the low-pressure cylinder component 1. The position adjustable mechanism 3 is mounted on the convenient disassembly and assembly mechanism 2. The position adjustable mechanism 3 is used to adjust and fix the position of the sensor 392. The convenient disassembly and assembly mechanism 2 includes a limiting member 21, which is fixedly connected to the outer wall of the low-pressure cylinder component 1. A through hole 22 is provided on the side of the limiting member 21, and a circular hole 23 is provided on the outer wall of the low-pressure cylinder component 1. A mounting base 24 is movably inserted into the inner cavity of the limiting member 21. A circular block 25 is fixedly connected to the outer wall of the mounting base 24 and movably inserted into the inner cavity of the circular hole 23. A rubber ring 26 is fixedly sleeved on the outer wall of the circular block 25 and movably abuts against the inner wall of the circular hole 23. With the design of the convenient disassembly and assembly mechanism 2, if the sensor 392 needs to be maintained, the mounting base 24 can be pulled out away from the low-pressure cylinder component 1 to drive the sensor 392. There is no need to disassemble and assemble the sensor 392 from the inside of the low-pressure cylinder component 1, which improves the convenience of maintenance. When the mounting base 24 is inserted into the inside of the limiting component 21, the circular block 25 will be inserted into the inside of the circular hole 23 at the same time. The rubber ring 26 can seal the connection between the circular block 25 and the circular hole 23.

[0025] As one implementation method in this embodiment, such as Figure 1As shown, flanges 13 are fixedly connected to both ends of the low-pressure cylinder component 1. The rotating shaft 11 and the turbine low-pressure cylinder blades 12 are located in the inner cavity of the low-pressure cylinder component 1. The low-pressure cylinder component 1 can be installed in the middle of the turbine casing from the flanges 13. Gas can drive the turbine low-pressure cylinder blades 12 to drive the rotating shaft 11 to rotate. At this time, the sensor 392 can monitor the status of the turbine low-pressure cylinder blades 12, and then the monitored data is fed back to the data acquisition device. Finally, the DEH alarms when the monitored data is abnormal. The sensor 392 is an existing structure, such as the sensor in a low-pressure cylinder blade health monitoring and transmission device (CN221610051U). It is worth noting that the sensor 392 and the data acquisition device in this solution are different. The data acquisition device and DEH are commercially available equipment that can be purchased by those skilled in the art. No structural modifications have been made to the equipment described in this paper. Therefore, those skilled in the art are familiar with its working principles based on their professional knowledge and can apply them proficiently. Thus, this paper will not elaborate further on this aspect. Furthermore, this solution aims to protect the physical structure, but does not protect the circuitry and software control. The proposed processing circuit is merely a supplementary explanation of the feasibility and authenticity of this utility model. This utility model does not seek protection for the algorithm and circuitry technology. It is worth emphasizing that although this solution does not elaborate on the electronic control program, those skilled in the art can be familiar with and apply it based on their professional knowledge.

[0026] As one implementation method in this embodiment, such as Figure 3 As shown, a groove 241 is provided on the outer wall of the mounting base 24, and a sliding pin 242 is slidably connected to the inner wall of the groove 241. The sliding pin 242 is movably inserted into the inside of the through hole 22. In the initial state, the sliding pin 242 is inserted into the inside of the through hole 22, locking the mounting base 24 on the low-pressure cylinder component 1. If it is necessary to disassemble the mounting base 24, the sliding pin 242 can be pulled out from the inside of the through hole 22.

[0027] As one implementation method in this embodiment, such as Figure 3 As shown, an elastic element 243 is fixedly installed on the outer wall of the sliding pin 242. The end of the elastic element 243 away from the sliding pin 242 is fixedly connected to the inner wall of the groove 241. A handle 244 is fixedly installed on the outer wall of the sliding pin 242. In the initial state, the elastic force of the elastic element 243 can maintain the state of the sliding pin 242 inserted into the through hole 22. Pushing the sliding pin 242 and compressing the elastic element 243 at the same time can cause the sliding pin 242 to be withdrawn from the inside of the through hole 22 for the user's use.

[0028] As one implementation method in this embodiment, such as Figure 4As shown, the position adjustable mechanism 3 includes a square tube 31, which is fixedly installed on the side of the circular block 25 away from the mounting base 24. A reinforcing foot 32 is welded between the circular block 25 and the square tube 31. The connection between the square tube 31 and the circular block 25 can be reinforced by the design of the reinforcing foot 32.

[0029] As one implementation method in this embodiment, such as Figure 4 As shown, an inner column 33 is slidably connected in the inner cavity of the square tube 31, and a bolt 34 is threadedly connected to the outer wall of the square tube 31. The end of the bolt 34 movably abuts against the outer wall of the inner column 33. A scale line 35 is provided on the outer wall of the inner column 33. By sliding the inner column 33 in the inner cavity of the square tube 31, the distance between the sensor 392 and the turbine low-pressure cylinder blade 12 can be adjusted, which facilitates the installation and commissioning work. Tightening the bolt 34 can lock the distance.

[0030] As one implementation method in this embodiment, such as Figure 4 As shown, a connecting plate 36 is fixedly installed at the bottom of the inner column 33, and a connecting arm 37 is fixedly installed on the outer wall of the connecting plate 36. A second scale line 38 is provided on the outer wall of the connecting arm 37. The design of the second scale line 38 and the aforementioned first scale line 35 can provide auxiliary markings for adjustment work and improve the accuracy of adjustment.

[0031] As one implementation method in this embodiment, such as Figure 4 As shown, a slider 39 is slidably connected to the outer wall of the connecting arm 37, and a second bolt 391 is threadedly connected to the outer wall of the slider 39. The end of the second bolt 391 movably abuts against the outer wall of the connecting arm 37. A sensor 392 is detachably connected to the outer wall of the slider 39. By sliding the slider 39 on the outer wall of the connecting arm 37, the axial position of the sensor 392 relative to the turbine low-pressure cylinder blade 12 can be adjusted, which facilitates the installation and commissioning work. Tightening the second bolt 391 can lock the position.

[0032] Working principle: During use, the gas can drive the turbine low-pressure cylinder blades 12 to rotate the shaft 11. At this time, the sensor 392 can monitor the status of the turbine low-pressure cylinder blades 12, and then the monitored data is fed back to the data acquisition device. Finally, the DEH will alarm when the monitored data is abnormal. During maintenance, push the sliding pin 242 and compress the elastic element 243 at the same time to make the sliding pin 242 withdraw from the inside of the through hole 22. Then pull the mounting base 24 away from the low-pressure cylinder component 1 to drive the sensor 392 for maintenance. During installation, the distance between the sensor 392 and the turbine low-pressure cylinder blades 12 can be adjusted by sliding the inner column 33 in the inner cavity of the square tube 31. Tightening the first bolt 34 will lock the distance. The axial position of the sensor 392 relative to the turbine low-pressure cylinder blades 12 can be adjusted by sliding the slider 39 on the outer wall of the connecting arm 37. Tightening the second bolt 391 will lock the position.

[0033] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A device for monitoring and acquiring the health of a low-pressure cylinder blade of a steam turbine, comprising a rotating shaft (11) and a sensor (392), wherein a low-pressure cylinder blade (12) of a steam turbine is fixedly mounted on the outer wall of the rotating shaft (11), characterized in that, Also includes: Low-pressure cylinder component (1); Easy disassembly and assembly mechanism (2), which is installed on the low-pressure cylinder component (1), is used to detachably install the position adjustable mechanism (3) on the low-pressure cylinder component (1); The position adjustable mechanism (3) is mounted on the convenient disassembly and assembly mechanism (2) and is used to adjust the position of the sensor (392). The convenient disassembly and assembly mechanism (2) includes a limiting member (21), which is fixedly connected to the outer wall of the low-pressure cylinder component (1). The limiting member (21) has a through hole (22) on its side and a round hole (23) on the outer wall of the low-pressure cylinder component (1). A mounting seat (24) is movably inserted into the inner cavity of the limiting member (21). A round block (25) is fixedly connected to the outer wall of the mounting seat (24). The round block (25) is movably inserted into the inner cavity of the round hole (23). A rubber ring (26) is fixedly sleeved on the outer wall of the round block (25). The rubber ring (26) movably abuts against the inner wall of the round hole (23).

2. The device for monitoring and acquiring the health of low-pressure cylinder blades of a steam turbine according to claim 1, characterized in that: Both ends of the low-pressure cylinder component (1) are fixedly connected to flanges (13), and the rotating shaft (11) and the turbine low-pressure cylinder blades (12) are located in the inner cavity of the low-pressure cylinder component (1).

3. The device for monitoring and acquiring the health of low-pressure cylinder blades of a steam turbine according to claim 2, characterized in that: The mounting base (24) has a groove (241) on its outer wall, and a sliding pin (242) is slidably connected to the inner wall of the groove (241). The sliding pin (242) is movably inserted into the through hole (22).

4. The turbine low-pressure cylinder blade health monitoring and data acquisition device according to claim 3, characterized in that: An elastic element (243) is fixedly installed on the outer wall of the sliding pin (242). One end of the elastic element (243) away from the sliding pin (242) is fixedly connected to the inner wall of the groove (241). A handle (244) is fixedly installed on the outer wall of the sliding pin (242).

5. The steam turbine low-pressure cylinder blade health monitoring and data acquisition device according to claim 1, characterized in that: The position adjustable mechanism (3) includes a square tube (31), which is fixedly installed on the side of the circular block (25) away from the mounting base (24), and a reinforcing foot (32) is welded between the circular block (25) and the square tube (31).

6. The steam turbine low-pressure cylinder blade health monitoring and data acquisition device according to claim 5, characterized in that: The inner cavity of the square tube (31) is slidably connected to an inner column (33), and a first bolt (34) is threadedly connected to the outer wall of the square tube (31). The end of the first bolt (34) is movably abutted against the outer wall of the inner column (33), and a first scale line (35) is provided on the outer wall of the inner column (33).

7. The steam turbine low-pressure cylinder blade health monitoring and data acquisition device according to claim 6, characterized in that: A connecting plate (36) is fixedly installed at the bottom of the inner column (33), and a connecting arm (37) is fixedly installed on the outer wall of the connecting plate (36). A second scale line (38) is provided on the outer wall of the connecting arm (37).

8. The steam turbine low-pressure cylinder blade health monitoring and data acquisition device according to claim 7, characterized in that: A slider (39) is slidably connected to the outer wall of the connecting arm (37), and a second bolt (391) is threadedly connected to the outer wall of the slider (39). The end of the second bolt (391) is movably abutted against the outer wall of the connecting arm (37), and the sensor (392) is detachably connected to the outer wall of the slider (39).

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