Horizontal water turbine generator thrust bearing lubricating oil path system monitoring device

Abstract

The application belongs to the field of equipment monitoring, and specifically discloses a horizontal water-turbine-generator thrust bearing lubricating oil path system monitoring device. The monitoring device comprises a data acquisition unit, which is configured to acquire multi-source state parameters of a thrust bearing oil supply mechanism and a thrust bearing body in a horizontal water-turbine-generator thrust bearing lubricating oil path system. The thrust bearing oil supply mechanism comprises an oil pump and an oil tank. The multi-source state parameters at least include oil supply parameters reflecting the running state of the oil pump, oil mist parameters reflecting the environmental state in the oil tank, and oil film parameters reflecting the lubricating state of the thrust bearing body. Through the structural design of the application, the running state of the horizontal water-turbine-generator thrust bearing lubricating oil path system can be comprehensively and accurately monitored, the accuracy and reliability of the monitoring are improved, and the safe and stable operation of the water turbine is ensured.

Description

Technical Field

[0001] This application belongs to the field of equipment monitoring, and more specifically, relates to a monitoring device for the lubrication oil circuit system of a horizontal hydro generator thrust bearing. Background Technology

[0002] The thrust bearing of a horizontal hydro-generator adopts a horizontal shaft structure, primarily bearing concentrated axial loads. However, this structure presents several challenges to the oil film stability of the thrust bearing: during start-up and shutdown, forced oil injection by the high-pressure oil pump can easily cause oil film rupture; uneven axial stress distribution further exacerbates fluctuations in oil film thickness; and the horizontal sealing structure suffers from oil mist leakage, leading to a gradual decline in lubrication performance. Due to these characteristics, the sub-optimal condition of the thrust bearing is difficult to detect effectively using traditional monitoring methods, resulting in low accuracy and reliability of monitoring. Utility Model Content

[0003] To address the shortcomings of existing technologies, this application provides a monitoring device for the lubrication oil circuit system of a horizontal hydro-generator thrust bearing, aiming to solve the problem of low accuracy and reliability of existing monitoring devices in monitoring the lubrication oil circuit system of a horizontal hydro-generator thrust bearing.

[0004] This application provides a monitoring device for the lubrication circuit system of a horizontal hydro-generator thrust bearing. The monitoring device includes a data acquisition unit configured to collect multi-source status parameters of the thrust bearing oil supply mechanism and the thrust bearing body in the lubrication circuit system of the horizontal hydro-generator thrust bearing. The thrust bearing oil supply mechanism includes an oil pump and an oil tank. The multi-source status parameters include at least: oil supply parameters reflecting the operating status of the oil pump, oil mist parameters reflecting the environmental status within the oil tank, and oil film parameters reflecting the lubrication status of the thrust bearing body.

[0005] Compared with the prior art, the above-described technical solution conceived in this application, through the data acquisition unit to collect multi-source state parameters of the thrust bearing oil supply mechanism and the thrust bearing body, including oil supply parameters, oil mist parameters and oil film parameters, can comprehensively and accurately monitor the operating status of the horizontal hydro-generator thrust bearing lubrication oil circuit system, thereby achieving the beneficial effects of improving the accuracy and reliability of monitoring and ensuring the safe and stable operation of the hydro-generator.

[0006] As a further preferred embodiment, the data acquisition unit includes a lubricating oil pipeline monitoring module, an oil sump oil mist monitoring module, and a bearing oil film monitoring module, wherein: the lubricating oil pipeline monitoring module is used to connect to the oil pump to monitor the oil supply pressure, oil supply flow rate, and number of pump start-stop cycles; the oil sump oil mist monitoring module is used to connect to the oil sump to monitor the oil mist concentration, oil mist distribution, and oil mist pressure at the oil sump seal; and the bearing oil film monitoring module is used to connect to the thrust bearing body to monitor the oil film thickness, oil film pressure, and bearing temperature at the bearing.

[0007] As a further preferred embodiment, the lubricating oil pipeline monitoring module includes a pressure transmitter and a turbine flow meter. The pressure transmitter is installed at the oil pump outlet to monitor the output oil pressure of the lubricating oil, and the turbine flow meter is installed on the oil pipeline to monitor the output flow rate of the lubricating oil.

[0008] As a further preferred embodiment, the lubricating oil pipeline monitoring module also includes a current sensor, which is electrically connected to the oil pump motor to measure the number of times the oil pump starts and stops.

[0009] As a further preferred embodiment, the oil tank oil mist monitoring module includes an infrared oil mist concentration sensor, a laser particle imager, a micro differential pressure sensor, and a capacitive displacement sensor. The infrared oil mist concentration sensor is installed on the oil tank with its monitoring end located inside the oil tank to monitor the oil mist concentration. The laser particle imager is installed at the observation port of the oil tank to capture the oil mist distribution. The micro differential pressure sensor and the capacitive displacement sensor are both installed at the sealing point of the oil tank to monitor the oil mist pressure and the change in the sealing gap, respectively.

[0010] As a further preferred embodiment, the oil tank oil mist monitoring module also includes a micro differential pressure sensor. The monitoring end of the micro differential pressure sensor is provided with two pressure guiding pipes. The two pressure guiding pipes are respectively used to connect the inner and outer sides of the oil tank sealing cover to monitor the pressure difference of the sealing gap.

[0011] As a further preferred embodiment, the bearing oil film monitoring module includes an eddy current displacement sensor and a pressure sensor. The eddy current displacement sensor is used to be installed on the thrust surface of the bearing to monitor the oil film thickness, and the pressure sensor is used to be installed in the bearing bearing area to monitor the oil film pressure.

[0012] As a further preferred embodiment, the bearing oil film monitoring module also includes a platinum resistance temperature sensor, which is installed in the middle of the bearing to monitor its temperature changes.

[0013] As a further preferred embodiment, the bearing oil film monitoring module also includes a differential pressure transmitter, the monitoring end of which is used to connect to the oil inlet and oil outlet of the bearing to monitor the changes in the inlet and outlet pressure of the lubricating oil.

[0014] As a further preferred embodiment, the monitoring device also includes a multi-level alarm module, which is electrically connected to at least one of the lubricating oil pipeline monitoring module, the oil tank oil mist monitoring module, and the bearing oil film monitoring module.

[0015] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages: 1. This application comprehensively monitors multi-source status parameters of the thrust bearing's oil supply mechanism and the thrust bearing body through a data acquisition unit. Specifically, it monitors key parameters in real time, such as oil pressure, flow rate, oil mist concentration, oil mist distribution, oil film thickness, oil film pressure, bearing temperature, and changes in lubricating oil inlet and outlet pressures. The monitoring accuracy and reliability are high. Through this monitoring data, the lubrication status and operating condition of the thrust bearing can be accurately grasped, potential faults can be detected in a timely manner, the reliability and operational stability of the system can be improved, maintenance costs can be reduced, equipment service life can be extended, and the safe and efficient operation of the horizontal hydro-generator can be ensured.

[0016] 2. This application incorporates a multi-level alarm module, capable of issuing different alarm signals based on the degree of abnormality of different monitored state parameters. This design can promptly detect and accurately locate abnormalities in the lubrication system, preventing overreaction or neglect by staff, thereby effectively ensuring the safe and stable operation of the turbine, reducing equipment downtime and maintenance costs, improving maintenance efficiency and convenience, significantly enhancing the timeliness of fault early warning, and effectively preventing unit shutdown accidents caused by bearing failure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a horizontal hydro-generator thrust bearing lubrication system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the overall structure of the monitoring device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the overall structure of the lubricating oil pipeline monitoring module and the oil tank oil mist monitoring module provided in the embodiments of this application; Figure 4 This is a schematic diagram of the overall structure of the bearing oil film monitoring module provided in the embodiments of this application.

[0018] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Thrust bearing oil supply mechanism; 11. Oil pump; 12. Oil tank; 121. Sealing cover; 2. Thrust bearing body; 21. Bearing shell; 211. Oil inlet; 212. Oil outlet; 3. Lubricating oil pipeline monitoring module; 31. Pressure transmitter; 32. Turbine flow meter; 33. Current sensor; 4. Oil tank oil mist monitoring module; 41. Infrared oil mist concentration sensor; 42. Laser particle imager; 43. Micro differential pressure sensor; 44. Capacitive displacement sensor; 5. Bearing shell oil film monitoring module; 51. Eddy current displacement sensor; 52. Pressure sensor; 53. Platinum resistance temperature sensor; 54. Differential pressure transmitter; 6. Multi-level alarm module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] Currently, the two main types of hydro-generators commonly used in my country are horizontal and vertical. Horizontal hydro-generators are arranged horizontally and operate based on the principle of electromagnetic induction. They convert water energy into mechanical energy through a turbine, which then drives the generator rotor to rotate. During rotation, the rotor cuts the magnetic field lines of the stator windings, thereby generating electricity.

[0021] A horizontal hydro turbine mainly consists of the turbine body, bearing structure, and generator. The key component of the bearing structure is the thrust bearing, whose primary function is to withstand axial thrust. During operation, the water thrust generated by the turbine acts along the axis onto the thrust bearing pads, which transmit the force to the foundation through the bearing housing. Therefore, the main function of this type of bearing is to withstand and transmit this axial thrust, ensuring the stable operation of the unit. The principle of the thrust bearing is to utilize rolling elements or hydrodynamic pressure to convert the axial load (a force parallel to the shaft centerline) acting on the shaft into rolling friction or fluid friction. When the rotor rotates, lubricating oil enters the gap between the bearing pads and the thrust disc along with the thrust disc. The axial thrust causes the bearing pads to deflect, forming a wedge-shaped oil film. The oil film pressure balances the axial thrust, achieving fluid friction, thereby supporting the rotating components and allowing them to rotate with lower resistance. This design not only reduces friction but also improves the bearing's load-bearing capacity and operational stability.

[0022] This application discloses a monitoring device for the lubrication oil circuit system of the thrust bearing of a horizontal hydro-generator, such as... Figure 1As shown, the thrust bearing lubrication system includes a thrust bearing oil supply mechanism 1 and a thrust bearing body 2. Specifically, the thrust bearing oil supply mechanism 1 includes an oil pump 11 and an oil tank 12. The oil pump 11 is installed in the oil tank 12 and connected to the thrust bearing body 2 through an oil delivery pipe to deliver lubricating oil. The thrust bearing body 2 includes a bearing shell 21. It should be noted that the structures of the thrust bearing oil supply mechanism 1 and the thrust bearing body 2 are existing technologies and are not improvements of this application; therefore, they will not be described in detail here.

[0023] In this embodiment, the monitoring device for the lubrication oil circuit system of the horizontal hydro-generator thrust bearing includes a data acquisition unit. This data acquisition unit is configured to collect multi-source status parameters of the thrust bearing oil supply mechanism 1 and the thrust bearing body 2. These parameters cover several key aspects, ensuring comprehensive monitoring of the operating status of the lubrication oil circuit system. The multi-source status parameters include at least: oil supply parameters reflecting the operating status of the oil pump 11, oil mist parameters reflecting the environmental state within the oil sump 12, and oil film parameters reflecting the lubrication state of the thrust bearing body 2. By real-time monitoring of indicators such as the flow rate, pressure, and start-stop frequency of the oil pump 11, it is possible to promptly detect whether the oil pump 11 is operating normally and whether there is insufficient or excessive oil supply, ensuring that the lubricating oil can be stably and continuously delivered to the thrust bearing body 2. By monitoring the oil mist concentration, distribution, pressure at the sealing gap, and changes in the sealing gap within the oil sump 12, it is possible to determine whether oil mist is leaking out. A good oil film can effectively prevent contact between the bearing bush 21 and the shaft, thus avoiding wear. By monitoring parameters such as oil film thickness and pressure, we can determine whether lubrication is adequate, detect signs of poor lubrication in a timely manner, and take appropriate measures to make adjustments.

[0024] By comprehensively monitoring the aforementioned multi-source status parameters, this monitoring device, compared to traditional monitoring devices, can comprehensively and accurately grasp the operating status of the thrust bearing lubrication system of a horizontal hydro-generator, significantly improving the accuracy and reliability of monitoring. This enables the monitoring device to provide strong support for the safe and stable operation of the turbine, ensuring that the turbine maintains good operating condition under various working conditions, extending the service life of the equipment, and reducing maintenance costs.

[0025] Specifically, the data acquisition unit includes a lubricating oil pipeline monitoring module 3, an oil sump oil mist monitoring module 4, and a bearing oil film monitoring module 5. The lubricating oil pipeline monitoring module 3, connected to the oil pump 11, can monitor the oil supply pressure, oil supply flow rate, and number of start-stop cycles of the oil pump 11. The oil sump oil mist monitoring module 4, connected to the oil sump 12, can monitor the oil mist concentration, oil mist distribution, and oil mist pressure at the seal of the oil sump 12. The bearing oil film monitoring module 5, connected to the thrust bearing body 2, can monitor the oil film thickness, oil film pressure, and temperature of the bearing 21.

[0026] More specifically, the lubricating oil pipeline monitoring module 3 includes a pressure transmitter 31, a turbine flow meter 32, and a current sensor 33. The pressure transmitter 31 is fixedly installed at the oil outlet of the oil pump 11, connected to the flange of the oil pump 11 outlet via a threaded interface. It monitors the output oil pressure of the lubricating oil. This is a piezoresistive pressure transmitter 31 with a range of 0-40 MPa. By monitoring the output oil pressure in real time, it ensures that the oil pressure is within the normal range, preventing poor lubrication due to excessively high or low oil pressure. The turbine flow meter 32 is fixedly installed on the oil supply pipeline connected to the oil pump 11 outlet. It is installed by connecting to the oil supply branch pipeline via a flange. It monitors the output flow rate of the lubricating oil. The turbine flow meter 32 has a range of 0-200 L / min. By monitoring the output flow rate of the lubricating oil in real time, it ensures that the lubricating oil can be delivered to the thrust bearing body 2 at an appropriate flow rate, preventing insufficient or excessive flow. The current sensor 33 is electrically connected to the motor of the oil pump 11, specifically through a non-contact connection with the motor cable of the oil pump 11. It is used to measure the number of times the oil pump 11 starts and stops. The current sensor 33 has a range of 0-100A. By monitoring the number of times the oil pump 11 starts and stops in real time, the operating status of the oil pump 11 can be understood, abnormalities can be detected in time, and the normal operation of the oil pump 11 can be ensured.

[0027] Furthermore, the oil mist monitoring module 4 includes an infrared oil mist concentration sensor 41, a laser particle imager 42, a micro differential pressure sensor 43, and a capacitive displacement sensor 44. The infrared oil mist concentration sensor 41 is bolted to the oil tank 12, with its monitoring end located inside the oil tank 12. It is used to monitor the oil mist concentration within the oil tank 12. The range of the infrared oil mist concentration sensor 41 is 0-500 mg / m³. 3 By monitoring the oil mist concentration in the oil tank 12 in real time, the concentration is ensured to be within a safe range, preventing oil mist leakage due to excessive concentration. A laser particle imager 42 is fixedly installed at the observation port of the oil tank 12 to capture the distribution of oil mist, accurately identifying its distribution within the tank and preventing excessively high local concentrations. A micro-differential pressure sensor 43 and a capacitive displacement sensor 44 are both installed at the sealing cover 121 of the oil tank 12, respectively monitoring oil mist pressure and changes in the sealing gap. Specifically, the monitoring end of the micro-differential pressure sensor 43 is fixedly connected to two pressure-conducting pipes, which connect to the inner and outer sides of the sealing cover 121 to monitor the pressure difference in the sealing gap. The monitoring range is ±500 Pa. Based on the monitoring results, software simulation can be used to obtain the oil mist diffusion within the oil tank 12, enabling timely detection of oil mist leakage caused by poor sealing of the sealing cover 121. The capacitive displacement sensor 44 is fixedly installed on the sealing cover 121 via a magnetic base to monitor changes in the sealing gap. The range is 0-10mm. It is installed at the radial monitoring point of the sealing cover 121. By monitoring changes in the sealing gap in real time, the sealing performance of the sealing cover is ensured and oil mist leakage is prevented.

[0028] Furthermore, the bearing oil film monitoring module 5 includes an eddy current displacement sensor 51, a pressure sensor 52, a platinum resistance temperature sensor 53, and a differential pressure transmitter 54. The eddy current displacement sensor 51 is fixedly mounted on the thrust surface of the bearing 21, specifically embedded at the edge of the thrust surface, to monitor the oil film thickness. The eddy current displacement sensor 51 has a range of 0-500 μm and uses an oil-resistant encapsulation. By monitoring the oil film thickness at the bearing 21 in real time, it ensures the oil film thickness is within the optimal range, avoiding poor lubrication due to an excessively thin or thick oil film. The pressure sensor 52 is glued to the bearing area of ​​the bearing 21 to monitor the oil film pressure. The pressure sensor 52 is a miniature pressure sensor with a range of 0-100 MPa. By monitoring the oil film pressure in real time, it ensures the oil film can withstand the axial thrust, preventing direct contact and wear between the bearing 21 and the shaft. A platinum resistance temperature sensor 53 is embedded in the temperature sensing hole at the center of the bearing bush 21 and fixed with thermally conductive adhesive. It is used to monitor temperature changes. The platinum resistance temperature sensor 53 is a PT100 platinum resistance temperature sensor with a range of 0-150℃. By monitoring the temperature changes of the bearing bush 21 in real time, it ensures that the temperature of the bearing bush 21 is within a safe range, avoiding poor lubrication or damage to the bearing bush 21 due to excessive temperature. The monitoring end of the differential pressure transmitter 54 is used to connect to the oil inlet 211 and oil outlet 212 of the bearing bush 21. Specifically, a threaded interface is used to connect the oil inlet 211 and oil outlet 212 of the bearing bush 21 to monitor the changes in the inlet and outlet pressure of the lubricating oil. The differential pressure transmitter has a range of ±1MPa. By monitoring the changes in the inlet and outlet pressure of the lubricating oil in real time, it ensures that the flow of the lubricating oil is normal and avoids poor lubrication due to abnormal pressure differences.

[0029] The monitoring device also includes a multi-level alarm module 6, which is used to issue alarms in a timely manner when abnormal conditions are detected. The multi-level alarm module 6 is electrically connected to at least one of the lubricating oil pipeline monitoring module 3, the oil sump oil mist monitoring module 4, and the bearing oil film monitoring module 5. In this embodiment, the multi-level alarm module 6 is electrically connected to the eddy current displacement sensor 51, the infrared oil mist concentration sensor 41, and the micro differential pressure sensor, respectively.

[0030] Specifically, when the eddy current displacement sensor 51 detects that the oil film thickness at the bearing bush 21 exceeds the normal range, the multi-level alarm module 6 will immediately issue a level one alarm, and the computer interface will flash red. When the infrared oil mist concentration sensor 41 detects that the oil mist concentration in the oil tank 12 exceeds the normal range, the multi-level alarm module 6 will immediately issue a level two alarm and send an SMS notification. When the micro differential pressure sensor detects that the pressure difference inside and outside the sealing cover exceeds the normal range, the multi-level alarm module 6 will immediately issue a level three alarm, triggering an audible and visual alarm.

[0031] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0032] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A monitoring device for the lubrication oil circuit system of a horizontal hydro-generator thrust bearing, characterized in that, The monitoring device includes a data acquisition unit configured to acquire multi-source status parameters of the thrust bearing oil supply mechanism (1) and the thrust bearing body (2) in the horizontal hydro-generator thrust bearing lubrication circuit system; the thrust bearing oil supply mechanism (1) includes an oil pump (11) and an oil tank (12); The multi-source state parameters include at least: oil supply parameters reflecting the operating state of the oil pump (11), oil mist parameters reflecting the environmental state inside the oil tank (12), and oil film parameters reflecting the lubrication state of the thrust bearing body (2).

2. A monitoring device for a thrust bearing lubricating oil circuit system of a horizontal hydrogenerator as set forth in claim 1, characterized in that, The data acquisition unit includes a lubricating oil pipeline monitoring module (3), an oil sump oil mist monitoring module (4), and a bearing oil film monitoring module (5), wherein: The lubricating oil pipeline monitoring module (3) is used to connect to the oil pump (11) to monitor the oil supply pressure, oil supply flow rate and the number of times the oil pump (11) starts and stops; The oil tank oil mist monitoring module (4) is used to connect to the oil tank (12) to monitor the oil mist concentration, oil mist distribution and oil mist pressure at the sealing point of the oil tank (12); The bearing oil film monitoring module (5) is used to connect to the thrust bearing body (2) to monitor the oil film thickness, oil film pressure and temperature of the bearing (21) at the bearing (21).

3. A monitoring device for a lubricating oil circuit system of a thrust bearing of a horizontal hydrogenerator as defined in claim 2, characterized in that The lubricating oil pipeline monitoring module (3) includes a pressure transmitter (31) and a turbine flow meter (32). The pressure transmitter (31) is installed at the oil outlet of the oil pump (11) to monitor the output oil pressure of the lubricating oil, and the turbine flow meter (32) is installed on the oil pipeline to monitor the output flow of the lubricating oil.

4. A monitoring device for a lubricating oil circuit system of a thrust bearing of a horizontal hydrogenerator as defined in claim 3, characterized in that The lubricating oil pipeline monitoring module (3) also includes a current sensor (33), which is electrically connected to the oil pump (11) motor to measure the number of times the oil pump (11) starts and stops.

5. A monitoring device for a thrust bearing lubricating oil circuit system of a horizontal hydrogenerator as defined in claim 2, characterized in that The oil mist monitoring module (4) includes an infrared oil mist concentration sensor (41), a laser particle imager (42), a micro differential pressure sensor (43), and a capacitive displacement sensor (44). The infrared oil mist concentration sensor (41) is installed on the oil tank (12), and the monitoring end is located inside the oil tank (12) to monitor the oil mist concentration. The laser particle imager (42) is installed at the observation port of the oil tank (12) to capture the distribution of oil mist. The micro differential pressure sensor (43) and the capacitive displacement sensor (44) are both installed at the sealing part of the oil tank (12) to monitor the oil mist pressure and the change of sealing gap, respectively.

6. A monitoring device for a lubricating oil circuit system of a thrust bearing of a horizontal hydrogenerator as defined in claim 2, characterized in that The bearing oil film monitoring module (5) includes an eddy current displacement sensor (51) and a pressure sensor (52). The eddy current displacement sensor (51) is installed on the thrust surface of the bearing (21) to monitor the oil film thickness, and the pressure sensor (52) is installed in the bearing area of ​​the bearing (21) to monitor the oil film pressure.

7. A monitoring device for a lubricating oil circuit of a thrust bearing of a horizontal hydrogenerator according to claim 2 or 6, characterized in that The bearing oil film monitoring module (5) also includes a platinum resistance temperature sensor (53), which is used to be installed in the middle of the bearing (21) to monitor its temperature change.

8. A monitoring device for a lubricating oil passage system of a thrust bearing of a horizontal hydrogenerator according to claim 2 or 6, characterized in that The bearing bush oil film monitoring module (5) further comprises a differential pressure transmitter (54), a monitoring end of the differential pressure transmitter (54) being used to be connected with the oil inlet (211) and the oil outlet cavity (212) of the bearing bush (21) to monitor the pressure change of the lubricating oil.

9. A monitoring device for a lubricating oil circuit of a thrust bearing of a horizontal hydrogenerator according to claim 2, characterized in that The monitoring device further comprises a multi-stage alarm module (6), the multi-stage alarm module (6) being electrically connected with at least one of the lubricating oil pipeline monitoring module (3), the oil tank oil mist monitoring module (4) and the bearing bush oil film monitoring module (5).

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