A movable vane axial displacement monitoring device

Abstract

The utility model discloses a movable guide vane axial displacement monitoring device, including the sensor support of being located on the top cap, be equipped with the sensor on the sensor support, the sensor is directly below vertical and is equipped with the lifting screw rod, the lifting screw rod bottom and the guide vane axle top of movable guide vane screw cooperation, the utility model discloses real -time monitoring to movable guide vane axial movement state, realizes the real -time monitoring to movable guide vane end face gap.

Description

Technical Field

[0001] This utility model relates to the field of movable guide vane monitoring technology, and in particular to an overhead LNG pipeline support structure with settlement compensation adjustment. Background Technology

[0002] Currently, analysis of maintenance records from multiple units reveals that the clearance between the upper and lower end faces of the turbine's movable guide vanes may change during the unit's operating cycle. This can lead to friction between the guide vane's upper and lower end faces and the top cover's anti-wear plate, resulting in excessive water leakage and potentially causing malfunctions such as guide vane jamming. These issues severely impact the safe and stable operation of the unit. However, there is currently no reliable system for monitoring the axial movement of the movable guide vanes in hydro-generator units. This makes it impossible to monitor and detect abnormal changes in the clearance between the upper and lower end faces of the movable guide vanes in real time, and lacks the ability to promptly detect and prevent frictional damage between the movable guide vanes and the top cover's anti-wear plate. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a device for monitoring the axial displacement of a movable guide vane, thereby enabling real-time monitoring of the axial movement state of the movable guide vane and realizing real-time monitoring of the gap at the end face of the movable guide vane.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an axial displacement monitoring device for movable guide vanes, including a sensor bracket on the top cover, a sensor on the sensor bracket, a lifting screw vertically arranged directly below the sensor, and the bottom of the lifting screw threadedly engaging with the top of the guide vane shaft of the movable guide vane.

[0005] Preferably, the lifting screw is axially mounted along the axis of the guide vane shaft of the movable guide vane.

[0006] Preferably, the sensor bracket is an L-shaped bracket, with its lower side fixedly connected to the top cover and the sensor mounted on its upper side.

[0007] Preferably, the guide vane shaft of the movable guide vane passes through the top cover and is fixedly connected to the guide vane arm.

[0008] Preferably, the end of the guide vane arm is connected to the guide vane shaft of the movable guide vane by a key.

[0009] Preferably, a cover plate is installed on the top of the guide vane arm and the top of the guide vane shaft of the movable guide vane, and a through hole for passing through the lifting screw is opened in the cover plate.

[0010] Preferably, the cover plate is fixedly connected to the top of the guide vane arm by bolts.

[0011] Preferably, an adjusting shim is installed in the gap between the cover plate and the top of the guide vane shaft of the movable guide vane.

[0012] Preferably, the sensor is an eddy current sensor for measuring distance.

[0013] Preferably, the signal output terminal of the sensor is connected to the data acquisition unit inside the acquisition box, and the output terminal of the data acquisition unit is connected to the input terminal of the industrial control computer.

[0014] Preferably, the surface of the lifting screw is further provided with a fastening nut.

[0015] The beneficial effects of this utility model are: (1) This utility model is simple and reliable, the network layout is easy to implement, the sensor is easy to install, the measurement accuracy is high, and the data can be easily queried using the existing big data platform.

[0016] (2) This utility model can monitor the axial displacement of the movable guide vane in real time, calculate the change of the gap between the upper and lower end faces of the movable guide vane, and realize the real-time monitoring of the gap between the end faces of the movable guide vane; under the condition that the unit does not need to drain water and open the volute access door, and the staff enters the guide vane to measure manually, the end face gap can be grasped in time, thus meeting the unit operation requirements.

[0017] (3) This utility model can monitor the axial displacement of the movable guide vane, providing effective data support for fault diagnosis such as wear of the movable guide vane and the top cover anti-wear plate, guide vane jamming, and equipment operation status judgment, ensuring the safe and stable operation of the unit.

[0018] (4) This utility model can analyze the axial displacement of the moving guide vane under different operating conditions of the unit. In particular, it can easily quantify the upward movement of the moving guide vane during emergency shutdown, which can provide data support for the optimization of the unit's operating conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the installation structure of a movable guide vane axial displacement monitoring device. Figure 2 This is a schematic diagram of the structure of a water turbine movable guide vane end face clearance monitoring system. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-2 As shown, an axial displacement monitoring device for a movable guide vane includes a sensor bracket 3 mounted on a top cover 4. A sensor 1 is mounted on the sensor bracket 3, and a lifting screw 8 is vertically mounted directly below the sensor 1. The bottom of the lifting screw 8 is threadedly engaged with the top of the guide vane shaft of the movable guide vane 5.

[0022] Preferably, the lifting screw 8 is axially installed along the axis of the guide vane shaft of the movable guide vane 5. Since the lifting screw 8 is aligned with the axis of the guide vane shaft of the movable guide vane 5, the lifting screw 8 will not deviate radially when the guide vane shaft of the movable guide vane 5 rotates, and the lifting screw 8 will always be located directly below the sensor 1. This allows for more accurate real-time monitoring when the axial movement state of the movable guide vane 5 changes, and the axial displacement of the lifting screw 8 is the axial displacement of the movable guide vane 5.

[0023] Preferably, the sensor bracket 3 is an L-shaped bracket, with its lower side fixedly connected to the top cover 4 and the sensor 1 mounted on its upper side. The sensor bracket 3 can fix the sensor 1 directly above the lifting screw 8, thereby enabling real-time monitoring of the axial movement of the movable guide vane 5.

[0024] Preferably, the guide vane shaft of the movable guide vane 5 passes through the top cover 4 and is fixedly connected to the guide vane arm 6. In this embodiment, the control mechanism is hinged to the guide vane arm 6 via a connecting rod. The control mechanism outputs a push or pull action, thereby causing the guide vane arm 6 to rotate around its axis. The rotation of the guide vane arm 6 directly drives the guide vane shaft of the movable guide vane 5 to rotate around its own axis.

[0025] Preferably, the end of the guide vane arm 6 is connected to the guide vane shaft of the movable guide vane 5 by a key.

[0026] Preferably, a cover plate 7 is installed on the top of the guide vane arm 6 and the top of the guide vane shaft of the movable guide vane 5, and a through hole for the lifting screw 8 is opened in the cover plate 7.

[0027] Preferably, the cover plate 7 is fixedly connected to the top of the guide vane arm 6 by bolts.

[0028] Preferably, an adjusting shim 2 is installed between the cover plate 7 and the top of the guide vane shaft of the movable guide vane 5. In this embodiment, during the installation of the movable guide vane 5, the end face gap is adjusted by increasing or decreasing the thickness of the adjusting shim 2 installed between the shaft end of the movable guide vane 5 and the cover plate 7. After adjustment, the lifting screw 8 is tightened according to the torque requirements.

[0029] Preferably, the sensor 1 is an eddy current sensor for measuring distance.

[0030] Preferably, the signal output terminal of sensor 1 is connected to the data acquisition unit inside the acquisition box, and the output terminal of the data acquisition unit is connected to the input terminal of the industrial control computer. For example... Figure 2As shown, this embodiment can construct a related water turbine movable guide vane end face clearance monitoring system. Data measured by sensors is transferred to the acquisition box via the sensor preamplifier terminal box. The data acquisition unit inside the acquisition box collects and processes the data, sending it to the industrial control computer for numerical calculation. The data processed by the industrial control computer is published to the existing site big data platform via a data server. Staff can easily query the data in the local industrial control computer through the office network publishing platform. Information such as the current end face clearance value, the end face clearance change trend over a time period, and alarm values ​​can be queried.

[0031] Preferably, the surface of the lifting screw 8 is further provided with a fastening nut. In this embodiment, the position of the lifting screw 8 can be secured by the fastening nut to prevent axial loosening.

[0032] The working principle of this embodiment is as follows: In this embodiment, the core function of the movable guide vane is to rotate around its guide vane axis to change the opening of the water flow channel between the guide vanes. When the guide vane arm receives the power from the control mechanism, it can drive the movable guide vane to rotate around its guide vane axis. The sensor can monitor the displacement of the movable guide vane and its guide vane axis in the axial direction.

[0033] Specifically, during the installation of the movable guide vane, the end face clearance is adjusted by increasing or decreasing the thickness of the adjusting shims installed between the upper shaft end of the guide vane and the cover plate. After adjustment, the tightening nut of the lifting screw is tightened according to the torque requirements. At this time, the upper end face clearance of the movable guide vane is measured as L1, and the lower end face clearance is measured as L2. The system selects an eddy current sensor as the measuring sensor, with a range of 0-4mm and an input voltage of DC-24V. The measurement distance is calculated based on the output voltage value. The sensor bracket is installed in place, and the clearance between the sensor and the upper end face of the lifting screw is adjusted, with an initial clearance value of S. The data measured by the sensor is transferred to the acquisition box through the sensor preamplifier terminal box. The data acquisition unit in the acquisition box collects and processes the data and sends it to the industrial control computer for numerical calculation.

[0034] Under the condition that the clearance of the movable guide vane end face can be measured, the calculation method is as follows: Given that the distance from the sensor to the lifting screw is S1, and the initial value is S, then the change in axial clearance of the guide vane shaft is ΔS = S1 - S. If ΔS > 0, the clearance of the upper end face... , At this point, the gap between the upper and lower surfaces increases, while the gap between the lower and upper surfaces decreases. If ΔS < 0, the gap between the upper and lower surfaces... , At this point, the upper end face clearance decreases, and the lower end face clearance increases. The upper end face clearance is set according to the unit's design and operating requirements. Gap with lower end face The system sets a warning value, and an alarm is triggered when the calculated value exceeds the warning value.

[0035] Under the condition of unknown clearance between the upper and lower end faces of the guide vane, the change in the end face clearance can be monitored. The calculation method is as follows: Given that the distance from the sensor to the upper end face of the lifting screw is S1, and the initial value is S, the change in axial clearance of the guide vane shaft is ΔS = S1 - S. The value of ΔS is the change in end face clearance. By observing the trend of ΔS over a time period, the trend of end face clearance change can be intuitively determined.

[0036] In this embodiment, the data processed by the industrial control computer is published to the existing site big data platform via a data server. Staff can easily query the data on the local industrial control computer through the office network publishing platform. They can query information such as the current end face gap value, the end face gap change trend within a time period, and alarm values.

[0037] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A device for monitoring the axial displacement of a movable guide vane, characterized in that: Includes a sensor bracket (3) on the top cover (4), a sensor (1) is provided on the sensor bracket (3), and a lifting screw (8) is provided vertically below the sensor (1). The bottom of the lifting screw (8) is threadedly engaged with the top of the guide shaft of the movable guide vane (5).

2. The axial displacement monitoring device for a movable guide vane according to claim 1, characterized in that: The lifting screw (8) is axially installed along the guide vane axis of the movable guide vane (5).

3. The axial displacement monitoring device for movable guide vanes according to claim 1, characterized in that: The sensor bracket (3) is an L-shaped bracket, with its lower side fixedly connected to the top cover (4) and the sensor (1) installed on its upper side.

4. The axial displacement monitoring device for a movable guide vane according to claim 3, characterized in that: The guide vane shaft of the movable guide vane (5) passes through the top cover (4) and is fixedly connected to the guide vane arm (6).

5. The axial displacement monitoring device for a movable guide vane according to claim 4, characterized in that: The end of the guide vane arm (6) is connected to the guide vane shaft of the movable guide vane (5) by a key.

6. The axial displacement monitoring device for a movable guide vane according to claim 4, characterized in that: A cover plate (7) is installed on the top of the guide vane arm (6) and the top of the guide vane shaft of the movable guide vane (5). A through hole for the lifting screw (8) is opened in the cover plate (7).

7. The axial displacement monitoring device for a movable guide vane according to claim 6, characterized in that: The cover plate (7) is fixedly connected to the top of the guide vane arm (6) by bolts.

8. The axial displacement monitoring device for a movable guide vane according to claim 6, characterized in that: An adjusting shim (2) is installed between the cover plate (7) and the top of the guide vane shaft of the movable guide vane (5).

9. The axial displacement monitoring device for a movable guide vane according to claim 1, characterized in that: The sensor (1) is an eddy current sensor used for measuring distance.

10. The axial displacement monitoring device for a movable guide vane according to claim 9, characterized in that: The signal output terminal of the sensor (1) is connected to the data acquisition unit in the acquisition box, and the output terminal of the data acquisition unit is connected to the input terminal of the industrial control computer.

11. The axial displacement monitoring device for a movable guide vane according to claim 1, characterized in that: The surface of the lifting screw (8) is also provided with a fastening nut.

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