Fan gearbox planet gear bearing temperature measuring device based on surface acoustic wave sensor

Abstract

The utility model discloses a fan gearbox planet wheel bearing temperature measuring device based on a surface acoustic wave sensor, which comprises a box body, a pin shaft, a surface acoustic wave sensor, an antenna and a signal processing unit, and is characterized in that at least two first mounting grooves for mounting the surface acoustic wave sensor are formed in the peripheral surface of the pin shaft; each surface acoustic wave sensor is mounted in the corresponding first mounting groove, the temperature measuring surface of each surface acoustic wave sensor is in direct contact with a bearing inner ring of the gearbox, a second mounting groove for mounting an antenna is formed in the pin shaft, and the second mounting groove is communicated with the first mounting grooves; the antenna is arranged on the box body and electrically connected with each surface acoustic wave sensor, each surface acoustic wave sensor communicates with the signal processing unit through the antenna, and the signal processing unit is arranged on the box body and electrically connected with a monitoring system of the fan. The planet wheel bearing temperature measuring device can effectively solve the problems that an existing planet wheel bearing temperature measuring device is complex in installation, greatly affected by the environment, low in measuring precision and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of wind power generation, and in particular to a temperature measuring device for planetary gear bearings in a wind turbine gearbox based on a surface acoustic wave sensor. Background Technology

[0002] In wind power systems, planetary gear bearings are critical components, and their operating condition directly affects the reliability and lifespan of the entire wind turbine generator. Because planetary gear bearings bear complex loads during operation, they are prone to temperature increases due to friction, wear, and other factors. Excessive temperatures accelerate bearing aging and damage, and can even lead to safety accidents. Therefore, accurate monitoring of planetary gear bearing temperatures is crucial.

[0003] For example, Chinese invention patent CN114198498A uses the thermocouple method to measure the temperature of planetary gear bearings. However, the thermocouple temperature measurement method requires the thermocouple to be directly installed on the bearing surface, and the temperature information is obtained by measuring the thermoelectric potential generated by the thermocouple. However, this method has problems such as complex installation and the need for lead wire connections. In the complex environment of wind power generation, the lead wires are easily affected by mechanical vibration, electromagnetic interference, etc., which leads to increased measurement errors and even damage to the measuring equipment.

[0004] Existing methods for measuring the temperature of planetary gear bearings have certain limitations in practical applications and cannot meet the requirements of wind power generation systems for accurate and reliable monitoring of planetary gear bearing temperatures. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a temperature measuring device for planetary gear bearings in a wind turbine gearbox based on a surface acoustic wave sensor. This device can effectively solve the problems of complex installation, high susceptibility to environmental influences, and low measurement accuracy of existing planetary gear bearing temperature measuring devices.

[0006] The objective of this utility model can be achieved by adopting the following technical solutions:

[0007] A temperature measuring device for planetary gear bearings in a wind turbine gearbox based on a surface acoustic wave (SAW) sensor includes a housing, a pin, SAW sensors, an antenna, and a signal processing unit. The outer circumferential surface of the pin has at least two first mounting slots for mounting the SAW sensors. The number of SAW sensors corresponds to the number of the first mounting slots, and each SAW sensor is installed in its corresponding first mounting slot. The temperature-sensing surface of the SAW sensor is in direct contact with the inner ring of the bearing via thermally conductive silicone. The inside of the pin has a second mounting slot for mounting the antenna. The second mounting slot is connected to the first mounting slot, and the antenna is electrically connected to each SAW sensor. Each SAW sensor communicates with the signal processing unit via the antenna. The signal processing unit is mounted on the housing and electrically connected to the wind turbine's monitoring system.

[0008] Furthermore, the temperature measuring surface of the surface acoustic wave sensor is flush with the outer peripheral surface of the pin.

[0009] Furthermore, the first mounting groove is arranged radially along the pin shaft.

[0010] Furthermore, the second mounting groove is arranged along the axial direction of the pin.

[0011] Furthermore, the piezoelectric layer of the surface acoustic wave sensor is made of zinc oxide, gallium nitride, or lead zirconate titanate.

[0012] Furthermore, the antenna is a microstrip loop antenna.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0014] 1. The temperature measuring device of this utility model adopts a surface acoustic wave sensor, which does not require lead wire connection or power supply, thus avoiding many problems caused by lead wires in the traditional thermocouple temperature measurement method. It is simple and convenient to install, and is not easily affected by mechanical vibration and electromagnetic interference, thereby improving the stability and reliability of the measurement.

[0015] 2. The temperature measuring device of this utility model adopts a surface acoustic wave sensor. Surface acoustic waves are very sensitive to temperature changes and can accurately sense minute changes in the temperature of planetary gear bearings, achieving high measurement accuracy and providing accurate data support for fault diagnosis of wind power generation systems.

[0016] 3. The temperature measuring device of this utility model adopts a surface acoustic wave sensor. Surface acoustic waves are less affected by environmental factors such as oil mist during propagation, and can work stably in complex wind power generation environments, ensuring the accuracy of measurement results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the temperature measuring device of this utility model.

[0018] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 3 This is a schematic diagram of the installation of the signal processing unit of this utility model.

[0020] Figure 4 This is a partial schematic diagram of the temperature measuring device of this utility model.

[0021] Figure 5 This is a schematic diagram of the pin structure of this utility model.

[0022] Figure 6 This is a schematic diagram of the surface acoustic wave sensor of this utility model.

[0023] Figure 7 This is a schematic diagram of the antenna structure of this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0025] Example 1:

[0026] like Figures 1 to 7As shown, this embodiment provides a temperature measuring device for planetary gear bearings of a wind turbine gearbox based on a surface acoustic wave (SAW) sensor. The device includes a housing 1, a pin 2, a SAW sensor 3, an antenna 4, and a signal processing unit 5. The outer circumferential surface of the pin 2 is provided with at least two first mounting slots 201 for mounting the SAW sensors 3. These first mounting slots 201 are arranged radially along the pin 2. The number of SAW sensors 3 corresponds to the number of the first mounting slots 201, and each SAW sensor 3 is installed in its corresponding first mounting slot 201. The temperature measuring surface is in direct contact with the inner ring 6 of the gearbox bearing via thermally conductive silicone 7, ensuring that the sensor and the inner ring 6 of the bearing can fit tightly together. The inside of the pin 2 is provided with a second mounting groove 202 for mounting the antenna 4, and the second mounting groove 202 is arranged along the axial direction of the pin 2. The second mounting groove 202 is connected to the first mounting groove 201, and the antenna 4 is electrically connected to each surface acoustic wave sensor 3. Each surface acoustic wave sensor 3 communicates with the signal processing unit 5 through the antenna 4. The signal processing unit 5 is set on the housing 1 of the stationary part of the gearbox and is electrically connected to the monitoring system of the fan.

[0027] During installation, ensure that the temperature measuring surface of the surface acoustic wave sensor 3 is flush with the outer peripheral surface of the pin 2.

[0028] The piezoelectric layer of the surface acoustic wave sensor 3 can be made of different types of piezoelectric materials, such as zinc oxide, gallium nitride, or lead zirconate titanate, to adapt to different working environments and improve sensitivity.

[0029] The antenna in this embodiment is a microstrip loop antenna.

[0030] The working principle of this embodiment is as follows:

[0031] An excitation signal is transmitted to the surface acoustic wave (SAW) sensor via a signal processing unit. The SAW sensor converts the excitation signal into a SAW signal, which is then temperature-modulated and converted back into an electrical signal via an antenna. The signal processing unit receives and processes the signal, calculates the temperature value of the planetary gear bearing, and finally transmits it to the wind turbine's monitoring system via cable.

[0032] In addition, this embodiment can also build a data processing and display system in a remote monitoring center to realize the real-time reception, storage, analysis and display of temperature data, and automatically issue an alarm signal when the monitored temperature exceeds the temperature threshold by setting a temperature threshold.

[0033] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A temperature measuring device for planetary gear bearings in a wind turbine gearbox based on a surface acoustic wave sensor, characterized in that: The device includes a housing, a pin, surface acoustic wave (SAW) sensors, an antenna, and a signal processing unit. The outer circumferential surface of the pin has at least two first mounting slots for mounting the SAW sensors. The number of SAW sensors corresponds to the number of the first mounting slots, and each SAW sensor is installed in its corresponding first mounting slot. The temperature-sensing surface of the SAW sensor is in direct contact with the inner ring of the bearing via thermally conductive silicone. The inside of the pin has a second mounting slot for mounting the antenna. The second mounting slot is connected to the first mounting slot, and the antenna is electrically connected to each SAW sensor. Each SAW sensor communicates with the signal processing unit via the antenna. The signal processing unit is mounted on the housing and electrically connected to the fan's monitoring system.

2. The temperature measuring device for planetary gear bearings of a wind turbine gearbox based on a surface acoustic wave sensor according to claim 1, characterized in that: The temperature measuring surface of the surface acoustic wave sensor is flush with the outer peripheral surface of the pin.

3. The temperature measuring device for planetary gear bearings of a wind turbine gearbox based on a surface acoustic wave sensor according to claim 1, characterized in that: The first mounting groove is arranged radially along the pin shaft.

4. The temperature measuring device for planetary gear bearings of a wind turbine gearbox based on a surface acoustic wave sensor according to claim 1, characterized in that: The second mounting groove is provided along the axial direction of the pin.

5. The temperature measuring device for planetary gear bearings of a wind turbine gearbox based on a surface acoustic wave sensor according to claim 1, characterized in that: The piezoelectric layer of the surface acoustic wave sensor is made of zinc oxide, gallium nitride, or lead zirconate titanate.

6. The temperature measuring device for planetary gear bearings of a wind turbine gearbox based on a surface acoustic wave sensor according to claim 1, characterized in that: The antenna is a microstrip loop antenna.

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