Hydro-generator thrust pad inward movement monitoring system and monitoring method

Abstract

The invention discloses a monitoring system and a monitoring method for inward movement of a thrust pad of a hydro-generator. The monitoring system comprises a thrust pad sensor, a supporting pad sensor and a spacer block supporting pad sensor which are used for measuring displacement, the thrust pad sensor is opposite to the outer end face of a thrust pad, the supporting pad sensor is opposite to the outer end face of a supporting pad, and the spacer block supporting pad sensor is opposite to the side end face of the supporting pad. The monitoring method adopts the monitoring system, and the calculation mode is as follows: if S thrust pad is equal to 0, the thrust pad does not move inwards; if the S thrust pad is larger than 0 and the S dragging pad is equal to 0, the S thrust pad moves inwards at the moment, and the dragging pad does not move inwards; if S thrust pad = S drag pad > 0, S spacing block and drag pad tilt; and at the moment, the thrust pad and the dragging pad move inwards to form the S thrust pad. The device has the beneficial effects that potential problems such as inward movement of the thrust pad can be found in advance by monitoring the inward movement condition of the thrust bearing in real time, serious damage to equipment due to faults is avoided, and the maintenance frequency and the equipment replacement frequency are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic generators, and particularly relates to a hydraulic generator thrust pad inward movement monitoring system and a monitoring method. BACKGROUND

[0002] The thrust pad is an important component of the vertical hydraulic generator unit and is used for bearing the load of the rotating part of the unit. However, after long-term operation of the vertical hydraulic generator unit, it is found that the thrust pad has an inward movement phenomenon in varying degrees, and the inward movement amount can reach 20 mm. When the inward movement reaches a certain degree, the force bearing area of the thrust pad is reduced, the pressure load is increased, and the temperature of the thrust pad is increased. The inward movement also reduces the gap between the thrust bearing and the spacer block, causing the thrust pad spring bundle self-adjusting function to fail, resulting in uneven force bearing of the thrust pad, which brings great hidden dangers to the safe and stable operation of the unit. The inward displacement of the thrust pad caused by thermal expansion and contraction of the mirror plate cannot be monitored by a reliable device and system at present, and the abnormal change of the inward movement of the thrust pad cannot be monitored in real time. The inward movement of the thrust bearing can only be found when the thrust bearing is disassembled for maintenance, which lacks timeliness and cannot avoid the inward movement of the thrust bearing and the failure of the thrust bearing. SUMMARY

[0003] The application provides a hydraulic generator thrust pad inward movement monitoring system and a monitoring method. The system and method can monitor the running state of the thrust pad in real time, can monitor the inward movement of the thrust pad in real time, can timely issue an alarm signal when the inward movement limit value is reached, can remind the operation and maintenance personnel to check and process in time, can timely solve the problem before the gap between the thrust bearing and the spacer block is reduced and stuck, and the self-adjusting function of the thrust pad spring bundle fails, can provide effective data support for equipment operation state analysis, and can guarantee the safe and stable operation of the equipment.

[0004] The application is achieved by the following technical scheme. A hydraulic generator thrust pad inward movement monitoring system comprises a base ring, a thrust pad, a bearing pad and a spacer block arranged on the base ring, and a thrust pad sensor, a bearing pad sensor and a spacer block bearing pad sensor for measuring displacement. The thrust pad sensor is opposite to the outer end surface of the thrust pad, the bearing pad sensor is opposite to the outer end surface of the bearing pad, and the spacer block bearing pad sensor is opposite to the side end surface of the bearing pad.

[0005] Further, the thrust pad sensor, the bearing pad sensor and the spacer block bearing pad sensor are all eddy current sensors.

[0006] Further, the thrust pad sensor is arranged in the radial direction of the base ring.

[0007] Further, the bearing pad sensor is arranged in the radial direction of the base ring. Further, the spacer block bearing pad sensor is arranged in the radial direction of the base ring.

[0008] Further, the outer end surface of the thrust pad is flush with the outer end surface of the pad, and the measurement reference surface of the thrust pad sensor is flush with the measurement reference surface of the pad sensor.

[0009] Further, the pad sensor of the spacer block is arranged along the tangential direction of the base ring.

[0010] Further, the measurement reference surface of the pad sensor of the spacer block is flush with the side end surface of the spacer block, and the gap between the pad and the spacer block is at least 2 mm.

[0011] Further, the thrust pad sensor, the pad sensor and the pad sensor of the spacer block are fixed on the sensor support through a threaded assembly, and the sensor support is fixed on the base ring.

[0012] Further, the thrust pad is arranged on the pad, a spring bundle is arranged between the pad and the base ring, and a spacer block is arranged between two adjacent pads, and the spacer block is fixed on the base ring.

[0013] Further, the thrust pad and the pad are uniformly arranged with a plurality of blocks in the circumferential direction, and one thrust pad corresponds to one pad.

[0014] A water turbine generator thrust pad inward movement monitoring method adopts the water turbine generator thrust pad inward movement monitoring system, and the calculation mode is as follows: When the thrust bearing installation adjustment is accurate, the initial values of the gaps measured by the thrust pad sensor, the pad sensor and the pad sensor of the spacer block are S 推力瓦 , S 拖瓦 and S 间隔块与拖瓦 respectively, during the operation of the thrust bearing, the actual values of the gaps measured by the thrust pad sensor, the pad sensor and the pad sensor of the spacer block are S 推力瓦1 , S 拖瓦1 and S 间隔块与拖瓦1 respectively, the radial inward movement change value of the thrust pad is AS 推力瓦 =S 推力瓦1 -S 推力瓦 , the radial inward movement change value of the pad is AS 拖瓦 =S 拖瓦1 -S 拖瓦 , and the distance change value between the pad and the spacer block is AS 间隔块与拖瓦 =S 间隔块与拖瓦1 -S 间隔块与拖瓦 ; if AS 推力瓦 =0, the thrust pad does not move inward at this time; if AS 推力瓦 >0, AS 拖瓦 =0, the thrust pad moves inward AS 推力瓦 , and the pad does not move inward; if AS 推力瓦 =AS 拖瓦 >0, AS 间隔块与拖瓦<0, at this time the thrust pad and the drag pad both move inwards △S 推力瓦 , indicating that the hook fixing the thrust bearing has failed. Set △S according to the design and operation requirements of the unit. 推力瓦 , △S 拖瓦 , △S 间隔块与拖瓦 When the calculated value exceeds the warning value, the data abnormality alarm reminder will issue an alarm to remind the operation and maintenance personnel to pay more attention and handle it.

[0015] Beneficial effects of this application: (1) The monitoring system is simple and reliable, the sensor is easy to install, the measurement accuracy is high, and the big data platform can be used to facilitate data query and analysis.

[0016] (2) The system can monitor the inward movement of the thrust bearing in real time and detect potential problems such as inward movement of the thrust pad in advance, thereby avoiding serious damage to the equipment due to failure, reducing the number of repairs and the frequency of equipment replacement, thereby saving repair costs and equipment replacement costs, reducing maintenance costs, and improving the economic benefits of the enterprise.

[0017] (3) The system has a monitoring limit value alarm reminder function. When its inward movement limit value is reached, an alarm signal is issued in time to remind the operation and maintenance personnel to check and deal with it in time. Before the gap between the thrust bearing and the spacer block is reduced and stuck, and the thrust washer spring bundle self-adjustment function fails, timely repair and solution of the problem is carried out, providing effective data support for the unit operation status analysis, enhancing the stability of the hydro-turbine generator set, reducing the probability of failure caused by thrust washer problems, and ensuring the safe and reliable operation of the unit.

[0018] (4) The monitoring system can analyze the inward movement of the thrust bearing under different working conditions, find the pattern of the inward movement of the thrust bearing and the maintenance cycle, and provide strong data support for the maintenance of the thrust bearing.

[0019] (5) The promotion and application of this monitoring system will help improve the technical level of the entire hydropower industry, encourage other related companies to increase investment in technology research and development, promote the industry to develop in the direction of intelligence and efficiency, promote technological progress in the industry, and improve the overall safety operation level and market competitiveness of the hydropower industry.

[0020] The aforementioned main solution and its various further options can be freely combined to form multiple solutions, all of which are solutions that can be adopted and protected by this application. Furthermore, in this application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the solution of this application, those skilled in the art will understand that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by this application, and these are not exhaustive here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a cross-sectional view (radial) of the structural installation of this application.

[0022] Figure 2 It is a top view of the structural installation of this application.

[0023] Figure 3 yes Figure 2 AA installation cross-sectional view (tangential).

[0024] Figure 4 It is a flowchart of this application.

[0025] In the figure: thrust pad sensor-1, drag pad sensor-2, sensor bracket-3, mirror plate-4, thrust pad-5, drag pad-6, spacer block-7, spacer block drag pad sensor-8, and base ring-9. DETAILED DESCRIPTION

[0026] The following non-limiting examples illustrate the present application.

[0027] Example 1 refer to Figures 1 to 3 As shown, a thrust pad inward movement monitoring system for a hydro-turbine generator includes a thrust pad sensor 1, a support pad sensor 2, a sensor bracket 3, a mirror plate 4, a thrust pad 5, a support pad 6, a spacer block 7, a spacer block support pad sensor 8 and a base ring 9.

[0028] The base ring 9 serves as the mounting base for the thrust bearing. Thrust pads 5, support pads 6, and spacer blocks 7 are mounted on the base ring 9. Specifically, the thrust pad 5 is mounted on the support pad 6, with a spring bundle installed between the support pad 6 and the base ring 9. Spacer blocks 7 are installed between adjacent support pads 6, and are bolted to the base ring 9. Several thrust pads 5 and support pads 6 are evenly arranged along the circumference, with one thrust pad 5 corresponding to one support pad 6.

[0029] The thrust pad sensor 1, the support pad sensor 2 and the spacer support pad sensor 8 are used to measure the displacement. The thrust pad sensor 1 is opposite to the outer end face of the thrust pad 5, the support pad sensor 2 is opposite to the outer end face of the support pad 6, and the spacer support pad sensor 8 is opposite to the side end face of the support pad 6, thereby obtaining the thrust pad inward displacement, the support pad inward displacement and the distance between the spacer block and the support pad respectively.

[0030] Thrust pad sensor 1, support pad sensor 2, and spacer support pad sensor 8 are all eddy current sensors with a range of 0-4mm and a DC-24V input voltage. The measured distance is calculated based on the output voltage. Thrust pad sensor 1 and support pad sensor 2 are positioned radially around base ring 9, while spacer support pad sensor 8 is positioned tangentially around the ring to ensure accurate measurement orientation, allowing the measured value to accurately reflect displacement.

[0031] The outer end face of the thrust pad 5 is flush with the outer end face of the pad 6, and the measurement reference surface of the thrust pad sensor 1 is flush with the measurement reference surface of the pad sensor 2, so that data comparison can be performed by the thrust pad sensor 1 and the pad sensor 2 to determine the relative displacement of the thrust pad 5 and the pad 6.

[0032] The measurement reference surface of the spacer block pad sensor 8 is flush with the side end face of the spacer block 7, and the gap between the pad 6 and the spacer block 7 is at least 2 mm, so that the measurement data of the spacer block pad sensor 8 can accurately determine the size of the gap.

[0033] The thrust pad sensor 1, the pad sensor 2, and the spacer block pad sensor 8 are all fixed on the sensor bracket 3 through a threaded assembly, and the sensor bracket 3 is fixed on the base ring 9 to achieve the specific installation and fixation of the sensors.

[0034] Embodiment 2 Reference Figures 1 to 4 As shown in the figure, a water turbine generator thrust pad inward movement monitoring method adopts the water turbine generator thrust pad inward movement monitoring system of embodiment 1, and the calculation method is as follows.

[0035] When the thrust bearing is installed and adjusted accurately, the initial values of the gaps measured by the thrust pad sensor 1, the pad sensor 2, and the spacer block pad sensor 8 are S 推力瓦 , S 拖瓦 , and S 间隔块与拖瓦 respectively, and during the operation of the thrust bearing, the actual values of the gaps measured by the thrust pad sensor 1, the pad sensor 2, and the spacer block pad sensor 8 are S 推力瓦1 , S 拖瓦1 , and S 间隔块与拖瓦1 respectively, then the change value of the radial inward movement of the thrust pad is ΔS 推力瓦 =S 推力瓦1 -S 推力瓦 , the change value of the radial inward movement of the pad is ΔS 拖瓦 =S 拖瓦1 -S 拖瓦 , and the change value of the distance between the pad and the spacer block is ΔS 间隔块与拖瓦 =S 间隔块与拖瓦1 -S 间隔块与拖瓦 .

[0036] If ΔS 推力瓦 =0, the thrust pad does not move inward at this time; if ΔS 推力瓦 >0, ΔS 拖瓦 =0, the thrust pad moves inward by ΔS 推力瓦 at this time, and the pad does not move inward; if ΔS 推力瓦 =ΔS 拖瓦 >0, ΔS 间隔块与拖瓦 <0, at this time, the thrust pad and the pad both move inward by ΔS 推力瓦, which indicates that the hook of the fixed thrust bearing is out of order (deformation, loose or broken bolt), and the warning value of △S 推力瓦 , △S 拖瓦 , △S 间隔块与拖瓦 is set according to the design and operation requirements of the unit, and when the calculated value exceeds the warning value, the data anomaly alarm reminder device will issue an alarm to remind the operation and maintenance personnel to pay more attention and handle it.

[0037] The thrust bearing displacement measurement sensors (thrust pad sensor 1, pad sensor 2 and spacer pad sensor 8), sensor preamplifier, data acquisition box, industrial computer and data processing server are sequentially electrically connected, and the data processing server is electrically connected with the data anomaly alarm reminder device and the big data analysis platform.

[0038] Through real-time monitoring and data acquisition and processing and saving by the sensor, the big data analysis platform is used to query and analyze the change trend of the inward movement of the thrust bearing under different working conditions in a period of time, find the law of the inward movement of the thrust bearing and the maintenance processing period, and provide strong data support for the maintenance of the thrust bearing.

[0039] The foregoing basic examples and each further selected example of the present application can be freely combined to form a plurality of embodiments, all of which are embodiments that can be used and claimed by the present application. In the present application, each selected example can be arbitrarily combined with any basic example and selected example.

[0040] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A system for monitoring the inward movement of a thrust shoe of a hydro-turbine generator, comprising a base ring (9), a thrust shoe (5), a support shoe (6) and a spacer block (7) provided on the base ring (9), characterized in that: The invention also includes a thrust pad sensor (1), a support pad sensor (2) and a spacer support pad sensor (8) for measuring displacement, wherein the thrust pad sensor (1) is opposite to the outer end face of the thrust pad (5), the support pad sensor (2) is opposite to the outer end face of the support pad (6), and the spacer support pad sensor (8) is opposite to the side end face of the support pad (6).

2. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, characterized in that: The thrust pad sensor (1), support pad sensor (2) and spacer block support pad sensor (8) are all eddy current sensors.

3. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, characterized in that: The thrust pad sensor (1) is arranged along the radial direction of the base ring (9).

4. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, characterized in that: The support valve sensor (2) is arranged along the radial direction of the base ring (9).

5. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, 3 or 4, characterized in that: The outer end surface of the thrust washer (5) is flush with the outer end surface of the support washer (6), and the measurement reference surface of the thrust washer sensor (1) is flush with the measurement reference surface of the support washer sensor (2).

6. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, characterized in that: The spacer block support pad sensor (8) is arranged along the tangent direction of the base ring (9).

7. The hydro-generator thrust shoe inward movement monitoring system according to claim 1 or 6, characterized in that: The measuring reference surface of the spacer block support pad sensor (8) is flush with the side end surface of the spacer block (7), and the gap between the support pad (6) and the spacer block (7) is at least 2 mm.

8. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, characterized in that: The thrust pad sensor (1), the support pad sensor (2) and the spacer block support pad sensor (8) are all fixed to the sensor bracket (3) through a threaded assembly, and the sensor bracket (3) is fixed to the base ring (9).

9. The hydro-generator thrust shoe inward movement monitoring system according to claim 1, characterized in that: The thrust washer (5) is arranged on the support washer (6), a spring bundle is provided between the support washer (6) and the base ring (9), a spacer block (7) is provided between two adjacent support washer (6), and the spacer block (7) is fixed on the base ring (9); the thrust washer (5) and the support washer (6) are evenly arranged in a plurality of blocks along the circumferential direction, and one thrust washer (5) corresponds to one support washer (6).

10. A method for monitoring inward movement of thrust shoe of a hydro-turbine generator, characterized in that: Using the hydro-generator thrust shoe inward movement monitoring system according to any one of claims 1 to 9, the calculation method is as follows: When the thrust bearing is correctly installed and adjusted, the initial values ​​of the clearances measured by the thrust bearing sensor (1), the support bearing sensor (2), and the spacer support bearing sensor (8) are S and 推力瓦 、S 拖瓦 、S 间隔块与拖瓦 During the operation of the thrust bearing, the actual clearance values ​​measured by the thrust bearing sensor (1), the support bearing sensor (2), and the spacer support bearing sensor (8) are S 推力瓦1 、S 拖瓦1 、S 间隔块与拖瓦1 , then the thrust pad radial inward displacement change value is △S 推力瓦 =S 推力瓦1 -S 推力瓦 , the radial inward displacement of the shoe is △S 拖瓦 =S 拖瓦1 -S 拖瓦 , the distance between the drag shoe and the spacer changes by △S 间隔块与拖瓦 =S 间隔块与拖瓦1 -S 间隔块与拖瓦 If △S 推力瓦 =0, at this time the thrust pad does not move inward; If △S 推力瓦 >0, △S 拖瓦 =0, at this time the thrust bearing moves inward △S 推力瓦 , the tile did not move inward; If △S 推力瓦 =△S 拖瓦 >0, △S 间隔块与拖瓦 <0, at this time the thrust pad and the drag pad both move inwards △S 推力瓦 , indicating that the hook fixing the thrust bearing has failed. Set △S according to the design and operation requirements of the unit. 推力瓦 , △S 拖瓦 , △S 间隔块与拖瓦 When the calculated value exceeds the warning value, the data abnormality alarm reminder will issue an alarm to remind the operation and maintenance personnel to pay more attention and handle it.

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