Movable guide vane end surface gap monitoring device
By designing a movable guide vane end face clearance monitoring device for water turbines, the problem that the prior art cannot monitor and discover abnormal changes in the movable guide vane gap in real time is solved, and accurate monitoring and failure prevention of guide vane movement is achieved.
Patent Information
- Application Number
- CN202422062496.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The prior art cannot monitor and discover abnormal changes in the gaps between the upper and lower end surfaces of the movable guide vanes in the turbine in real time, resulting in water leakage and jamming of the guide vanes, affecting the safe and stable operation of the unit.
A movable guide vane end face clearance monitoring device is designed, including a displacement sensor, a sensor fixing device and a fixing ring. One end of the sensor fixing device is fixed in the top cover of the turbine, and a displacement sensor is installed on the other end to monitor the axial displacement distance of the movable guide vane.
Real-time monitoring of the end face gap of the movable guide vane is achieved, ensuring the accuracy and stability of the sensor measurement value, not affected by the unit operating conditions, and avoiding faults such as water leakage and jamming of the guide vane.
Smart Images
Figure CN222912708U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of monitoring the movable guide vanes of a water turbine, and particularly relates to a device for monitoring the end face clearance of movable guide vanes. Background Technique
[0002] Analysis and summary of the maintenance records of multiple units found that during the operation cycle of the units, the upper and lower end face clearances of the movable guide vanes of the water turbine may change, and the upper and lower end faces of the guide vanes may scrape against the wear-resistant plate of the top cover, resulting in a relatively large water leakage of the guide vanes, and even may cause faults such as jamming of the movable guide vanes, which has a serious adverse impact on the safe and stable operation of the units. At present, there is no reliable system for monitoring the axial movement of the movable guide vanes in a hydro-generating unit, and it is impossible to monitor and detect the abnormal changes in the upper and lower end face clearances of the movable guide vanes in real time, lacking the ability to detect and avoid the frictional damage between the movable guide vanes and the wear-resistant plate of the top cover in a timely manner. There is no simple, reliable and stable sensor mounting bracket, and no suitable mounting method for the end face clearance monitoring sensor. Content of the Utility Model
[0003] Aiming at the problems existing in the prior art, a device for monitoring the end face clearance of movable guide vanes is provided. By providing a mounting method for a sensor for monitoring the end face clearance of the movable guide vanes of a water turbine in a hydropower station, the monitoring device is simple, reliable and stable to install, and the bracket can rotate with the change of the guide vane opening, and does not affect the measurement accuracy of the sensor during the rotation process.
[0004] The technical solution adopted by the utility model is as follows: A device for monitoring the end face clearance of movable guide vanes, which is applied to a water turbine, includes a displacement sensor, a sensor fixing device and a fixing ring; the fixing ring is fixed on the movable guide vane arm and provides an end face in contact with the displacement sensor; one end of the sensor fixing device is fixed in the top cover of the water turbine, and the other end is provided with a displacement sensor, and the displacement sensor is in contact with the end face provided by the fixing ring for monitoring the axial displacement distance of the movable guide vane.
[0005] As a preferred solution, the fixing ring further includes a first adjusting screw, a second adjusting screw arranged on the upper surface and a measuring plate connected to the first adjusting screw and the second adjusting screw; the upper surface of the measuring plate provides an end face in contact with the displacement sensor.
[0006] As a preferred solution, the upper surface of the measuring plate is perpendicular to the axis of the movable guide vane arm.
[0007] As a preferred solution, the fixing ring is composed of two semi-circular rings, and the two semi-circular rings are connected and fixed on the movable guide vane arm through fixing ring bolts.
[0008] As a preferred solution, first through holes and second through holes are provided at both ends of the measuring plate, and after the first adjusting screw rod and the second adjusting screw rod pass through the first through hole and the second through hole respectively, nuts are used to fix the measuring plate on the upper and lower sides.
[0009] As a preferred solution, the sensor fixing device includes a bracket and a connecting arm. The first end of the bracket is fixed to the top cover, the second end of the bracket is connected to the first end of the connecting arm, and the second end of the connecting arm is fixed with a displacement sensor.
[0010] As a preferred solution, the sensor fixing device further includes a connecting plate and a bracket bolt. The connecting plate is installed at the second end of the bracket through the bracket bolt, and the first end of the connecting arm is fixedly connected to the connecting plate.
[0011] As a preferred solution, the connecting plate is provided with a plurality of fixing holes for adjusting the position of the connecting arm.
[0012] As a preferred solution, the measuring plate is made of stainless steel, and the surface roughness of the upper surface is above Ra 0.8 level.
[0013] As a preferred solution, the bracket is an L-shaped bracket, and the connecting arm is an L-shaped connecting arm.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0015] (1) The monitoring device proposed by the present utility model has a simple structure, is easy to install and disassemble, the sensor is simply installed, and the measurement accuracy is high.
[0016] (2) The monitoring device proposed by the present utility model does not need to change the structure of the existing equipment.
[0017] (3) In the monitoring device proposed by the present utility model, the measuring plate makes circumferential movement and axial movement synchronously with the guide vane, and the movement law is completely consistent with that of the guide vane. The measured value of the sensor can truly reflect the movement value of the guide vane.
[0018] (4) The accuracy of the measured value of the sensor of the monitoring device proposed by the present utility model is not affected by the operating conditions of the unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of a movable guide vane end face clearance monitoring device proposed by the present utility model.
[0020] Figure 2 It is a schematic diagram of a fixing ring in an embodiment of the present utility model.
[0021] Figure 3 It is a schematic diagram of the installation of the bracket in an embodiment.
[0022] Reference numerals: fixed ring bolt - 1, first adjusting screw - 2, measuring plate - 3, upper adjusting nut - 4, lower adjusting nut - 5, movable guide vane arm - 6, fixed ring - 7, connecting arm - 8, connecting plate - 9, support bolt - 10, support - 11, displacement sensor - 12, top cover - 13. Detailed implementation mode
[0023] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar modules or modules with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.
[0024] To make the monitoring and measurement of the end face clearance of the movable guide vane more accurate and ensure the safe and stable operation of the unit, please refer to Figure 1 , Figure 3 , an end face clearance monitoring device for a movable guide vane is proposed in an embodiment of the present utility model, which is mainly arranged at the movable guide vane of a water turbine. The monitoring device mainly includes a displacement sensor 12, a sensor fixing device and a fixed ring 7. Among them, the fixed ring 7 is fixed on the movable guide vane arm 6 and provides an end face in contact with the displacement sensor 12; one end of the sensor fixing device is fixed in the top cover 13 of the water turbine, and the other end is provided with a displacement sensor 12, and the displacement sensor 12 is in contact with the end face provided by the fixed ring 7 for monitoring the axial displacement distance of the movable guide vane.
[0025] Specifically, please refer to Figure 2 , in this embodiment, the fixed ring 7 further includes a first adjusting screw 2 provided on the upper surface, a second adjusting screw (not marked in the figure) and a measuring plate 3 connected to the first adjusting screw 2 and the second adjusting screw; the upper surface of the measuring plate 3 provides an end face in contact with the displacement sensor 12. Further, in this embodiment, the fixed ring 7 is composed of two semi - rings, and the two semi - rings are connected and fixed on the movable guide vane arm 6 through a fixed ring bolt 1. In practical applications, the measuring plate 3 can be in a semi - circular ring shape matching the movable guide vane arm 6 as Figure 2 shown, or in other shapes, etc.
[0026] When setting the first adjusting screw 2 and the second adjusting screw, the first adjusting screw 2 and the second adjusting screw should be spaced at a certain distance to ensure the stability of the measuring plate 3.
[0027] In one embodiment, a first through hole and a second through hole are formed in the measuring plate 3, and the distance between the through holes should match the intervals of the first adjusting screw 2 and the second adjusting screw. During installation, the first adjusting screw 2 and the second adjusting screw are respectively inserted into the first through hole and the second through hole, and then fixed at the upper and lower ends of the measuring plate 3 by nuts (including the upper adjusting nut 4 and the lower adjusting nut -5). The position of the measuring plate 3 can also be adjusted by the nuts.
[0028] It should be noted that to ensure the accuracy of measurement, a certain levelness should be ensured during the installation of the measuring ring, that is, the upper surface of the measuring plate 3 should be axially perpendicular to the movable guide vane arm 6, so as to ensure that the displacement distance of the measuring plate 3 measured by the sensor is the axial movement distance of the movable guide vane. In this embodiment, the levelness of the measuring plate 3 is adjusted by adjusting the nuts on both sides of the measuring ring, and a spirit level can be conveniently placed on the measuring plate 3. In one embodiment, in order to facilitate fine adjustment, the adjusting nut is a fine-thread nut.
[0029] In one embodiment, the measuring plate 3 is made of stainless steel and the surface roughness of the upper surface is above Ra0.8 level.
[0030] In this embodiment, the sensor fixing device is mainly used to fix the displacement sensor 12 and make the displacement sensor 12 contact with the upper surface of the measuring plate 3. The sensor fixing device includes a bracket 11 and a connecting arm 8. The first end of the bracket 11 is fixed to the top cover 13, the second end of the bracket 11 is connected to the first end of the connecting arm 8, and the second end of the connecting arm 8 fixes the displacement sensor 12.
[0031] In one embodiment, in order to facilitate the adjustment of the position of the displacement sensor 12, the sensor fixing device further includes a connecting plate 9 and a bracket bolt 10. The connecting plate 9 is installed at the second end of the bracket 11 through the bracket bolt 10, and the first end of the connecting arm 8 is fixedly connected to the connecting plate 9. Specifically, the connecting plate 9 is provided with a plurality of fixing holes, and the position of the displacement sensor 12 can be adjusted by connecting with the bracket 11 using different fixing holes.
[0032] In one embodiment, the bracket 11 is an L-shaped bracket 11, and the connecting arm 8 is an L-shaped connecting arm 8. The first end of the bracket 11 is connected to the top cover 13 by welding or bolts. The first end connecting plate 9 of the connecting arm 8 is welded into one body and is installed and fixed on the bracket 11 through a connecting bolt.
[0033] In practical applications, the fixed ring 7 is installed on the movable guide vane arm 6. During the opening and closing process of the movable guide vane, the measuring plate 3 makes a circumferential movement synchronously with the guide vane. The axial displacement of the movable guide vane is synchronously transmitted to the measuring plate 3, and the displacement sensor 12 in contact with the measuring plate 3 can detect the change amount of the end face clearance of the movable guide vane by detecting the up and down displacement amount of the measuring plate 3.
[0034] The monitoring device proposed in this application has the following advantages:
[0035] (1) The monitoring device proposed by the utility model has a simple structure, is easy to install and disassemble, the sensor is easy to install, and has high measurement accuracy.
[0036] (2) The monitoring device proposed by the utility model does not require changes to the existing equipment structure.
[0037] (3) In the monitoring device proposed by the utility model, the measuring plate performs circumferential motion and axial motion synchronously with the guide vane, and the motion law is completely consistent with the guide vane. The sensor measurement value can truly reflect the motion value of the guide vane.
[0038] (4) The accuracy of the values measured by the sensors of the monitoring device proposed by the utility model is not affected by the operating conditions of the unit.
[0039] It should be noted that in the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, not all of the embodiments. The components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A movable guide vane end surface clearance monitoring device, used in a water turbine, characterized in that: It comprises a displacement sensor, a sensor fixing device and a fixing ring; the fixing ring is fixed on the movable guide vane arm and is provided with an end face in contact with the displacement sensor; one end of the sensor fixing device is fixed in the turbine top cover, and the other end is provided with a displacement sensor, and the displacement sensor is in contact with the end face provided by the fixing ring, so as to monitor the axial displacement distance of the movable guide vane.
2. The movable guide vane end surface clearance monitoring device according to claim 1, characterized in that: The fixing ring further comprises a first adjusting screw and a second adjusting screw arranged on the upper surface and a measuring plate connected to the first adjusting screw and the second adjusting screw; the upper surface of the measuring plate provides an end surface in contact with the displacement sensor.
3. The movable guide vane end surface clearance monitoring device according to claim 2, characterized in that: The upper surface of the measuring plate is perpendicular to the axial direction of the movable guide vane arm.
4. The movable guide vane end surface clearance monitoring device according to claim 1 or 2, characterized in that: The fixing ring is composed of two semicircular rings, and the two semicircular rings are fixed on the movable guide vane arm through fixing ring bolts.
5. The movable guide vane end surface clearance monitoring device according to claim 2, characterized in that: The measuring plate is provided with a first through hole and a second through hole at both ends. The first adjusting screw and the second adjusting screw are respectively inserted into the first through hole and the second through hole, and nuts are used on the upper and lower sides to fix the measuring plate.
6. The movable guide vane end surface clearance monitoring device according to claim 1, characterized in that: The sensor fixing device comprises a bracket and a connecting arm, the first end of the bracket is fixed to the top cover, the second end of the bracket is connected to the first end of the connecting arm, and the second end of the connecting arm is fixed to the displacement sensor.
7. The movable guide vane end surface clearance monitoring device according to claim 6, characterized in that: The sensor fixing device also includes a connecting plate and a bracket bolt. The connecting plate is installed on the second end of the bracket through the bracket bolt. The first end of the connecting arm is fixedly connected to the connecting plate.
8. The movable guide vane end surface clearance monitoring device according to claim 7, characterized in that: The connecting plate is provided with a plurality of fixing holes for adjusting the position of the connecting arm.
9. The movable guide vane end surface clearance monitoring device according to claim 2, characterized in that: The measuring plate is made of stainless steel, and the upper surface roughness is above Ra0.
8.
10. The movable guide vane end surface clearance monitoring device according to claim 6, characterized in that: The bracket is an L-shaped bracket, and the connecting arm is an L-shaped connecting arm.