Device for detecting quality of lubricating oil of rotating part of wind driven generator

Abstract

The utility model discloses a device for detecting the quality of lubricating oil of a rotating part of a wind driven generator. The device is characterized by comprising a probe assembly, a connecting cable and a detection host, the probe assembly comprises a microwave probe, a propeller, a detection pipe, a connecting pipe and a connecting flange, the microwave probe is arranged in the detection pipe, the propeller is arranged at one end of the detection pipe, the connecting pipe and the detection pipe are connected together in a T-shaped mode, and the connecting flange is arranged at the end, away from the detection pipe, of the connecting pipe; the connecting cable comprises a microwave transmission line and a propeller wire, and the microwave transmission line and the propeller wire are led out of the detection host and connected with the microwave probe and the propeller of the probe assembly respectively. The device solves the problems of low detection precision, complex process, incapability of real-time online detection and the like in the existing detection method, and realizes accurate, rapid and real-time detection of the lubricating oil quality of the rotating part of the wind driven generator.

Description

Technical Field

[0001] This application relates to the field of sensor technology, specifically to a device for detecting the quality of lubricating oil in rotating components of a wind turbine. Background Technology

[0002] The domestic wind power industry is developing rapidly; however, there are still no unified technical standards in China for the technical requirements, quality testing, and lubrication system maintenance of wind turbine lubricating oil. Statistics show that the failure rate of wind turbine gearboxes is approximately twice that of industrial gearboxes, with 80% of these failures caused by friction, wear, and lubrication failure. Lubricating oil carries various machining products and foreign contaminants related to operating conditions. Testing the lubricating oil can better help wind farm users select and use oil scientifically, improve lubricating oil management, enhance equipment reliability, and effectively reduce maintenance costs. Therefore, it is necessary to monitor the lubricating oil in wind turbine gearboxes.

[0003] Chinese Patent CN221779972U, published on September 27, 2024, discloses a wind turbine gearbox lubricating oil condition monitoring device. The device includes a gearbox body and a lubricating oil tank for supplying lubricating oil to the gearbox. A gearbox lubrication pipe is located on one side of the gearbox body. A control device is fixedly installed on the top side of the lubricating oil tank. A pressure gauge for detecting input oil pressure and an oil tank input pipe located on the pressure gauge are respectively arranged on the left side of the lubricating oil tank. A lubricating oil output pipe is connected to the bottom of the lubricating oil tank, and a viscosity sensor is also connected to the lubricating oil output pipe. The output end of the viscosity sensor communicates with a processor located on the main control board inside the control device. However, this patent mainly focuses on online detection of the viscosity of the wind turbine lubricating oil.

[0004] However, the main problem causing lubricant failure in the rotating parts of wind turbines is excessive water content. Currently, when the water content of the lubricant in the rotating parts of wind turbines exceeds 0.03%, significant emulsification occurs, requiring replacement. When the water content reaches 0.05%, the lubricant needs to be replaced promptly.

[0005] Moisture in the lubricating oil of rotating components in wind turbines originates from two main sources: external intrusion and internal generation. External intrusion primarily occurs due to poor equipment sealing and air introduction. Poor equipment sealing, such as damage to oil seals or gaskets, or aging of seals, allows external moisture to enter the lubricating oil during equipment operation. Air introduction occurs because air contains a certain amount of water vapor, especially in high-humidity environments. When the equipment's breather valve malfunctions or the vent is blocked, air entering the equipment will carry moisture into the lubricating oil. Internal generation includes condensation from cooling and chemical reactions. During equipment operation, heat is generated, and the temperature drops rapidly after shutdown. At this time, moisture in the air easily condenses into water droplets on the inner walls of the equipment and the surface of the lubricating oil, mixing into the lubricating oil. Certain additives or base oils in the lubricating oil may react chemically with oxygen and other impurities under certain conditions to produce water; for example, ester additives in the lubricating oil can produce water during hydrolysis.

[0006] Excessive water content in the lubricating oil of rotating components in wind turbines can lead to emulsification, resulting in impaired lubrication performance, accelerated oxidation and deterioration, and equipment corrosion. Impaired lubrication performance is primarily manifested in reduced oil film strength and increased friction coefficient: Reduced oil film strength means that water thins the lubricating oil film, decreasing its strength and increasing the probability of direct contact between rotating components, thus exacerbating wear; increased friction coefficient means that the presence of water alters the rheological properties of the lubricating oil, increasing the friction coefficient, which not only leads to increased energy loss but may also cause abnormal heating and vibration. Accelerated oxidation and deterioration are mainly due to catalytic oxidation reactions and accelerated additive failure. Catalytic oxidation reactions refer to the fact that water, as a catalyst for many chemical reactions, accelerates the oxidation process in lubricating oil, increasing its acid value and producing more oxidation products such as gums and asphaltenes. These increase the viscosity of the lubricating oil, clogging filters and oil passages; accelerated additive failure means that additives in the lubricating oil, such as antioxidants and anti-wear agents, are more likely to undergo hydrolysis and other reactions in the presence of water, losing their activity and thus reducing the overall performance of the lubricating oil. Equipment corrosion includes electrochemical corrosion and hydrogen embrittlement. Electrochemical corrosion occurs when moisture combines with certain substances in lubricating oil to form an electrolyte solution, creating an electrochemical corrosion cell on the metal surface of the equipment. This accelerates metal corrosion; for example, steel is prone to rusting in lubricating oil with high moisture content, affecting equipment performance and reliability. Hydrogen embrittlement occurs under certain conditions when moisture decomposes on the metal surface, producing hydrogen atoms that may penetrate into the metal, reducing the toughness of the metal material and causing hydrogen embrittlement. This makes equipment components more susceptible to breakage and failure.

[0007] Therefore, there is an urgent need for a detection device that can detect the water content in the lubricating oil of the rotating parts of wind turbines online, so as to promptly assess the quality of the lubricating oil and replace it appropriately. Utility Model Content

[0008] In view of this, this application provides a device for detecting the quality of lubricating oil in rotating components of a wind turbine. It utilizes a microwave coaxial resonant cavity and can indirectly determine the water content in the lubricating oil by measuring the resonant frequency of the coaxial resonant cavity sensor. This device enables online detection of lubricating oil quality and features the advantages of requiring no reagents or sampling, high sensitivity, good environmental adaptability, low cost, and easy maintenance. It is very suitable for on-site online measurement.

[0009] According to one aspect of this application, one embodiment provides a device for testing the quality of lubricating oil in rotating components of a wind turbine, including a probe assembly, connecting cables, and a testing host.

[0010] The probe assembly includes a microwave probe, a propeller, a detection tube, a connecting tube, and a connecting flange. The microwave probe is disposed inside the detection tube, the propeller is disposed at one end of the detection tube, the connecting tube is connected to the detection tube in a T-shape, and a connecting flange is provided at the end of the connecting tube away from the detection tube.

[0011] The connecting cable includes a microwave transmission line and a propeller wire. The microwave transmission line and the propeller wire are threaded through the connecting tube of the probe assembly and connected to the microwave probe and the propeller in the detection tube, respectively.

[0012] The detection host includes a microprocessor, a microwave radio frequency module, an analog-to-digital converter module, a power supply module, and an Ethernet chip. The power supply module is connected to the microprocessor, the microwave radio frequency module, the analog-to-digital converter module, and the Ethernet chip. The microprocessor is connected to the microwave radio frequency module, the digital conversion module, and the Ethernet chip. The microwave radio frequency module is connected to the microwave probe of the probe assembly via a microwave transmission line. The power supply module is connected to the propeller of the probe assembly via a propeller wire.

[0013] In some embodiments, the microwave probe includes a microwave coaxial resonant cavity structure and a coupling ring. The microwave coaxial resonant cavity structure comprises a cylindrical inner conductor, an annular outer conductor wall, and closed conductors at both ends. The cylindrical inner conductor is located at the center of the annular outer conductor wall, and the two open ends of the annular outer conductor wall are closed by the closed conductors. The two ends of the cylindrical inner conductor are respectively connected to the closed conductors at both ends. The hollow cavity inside is a microwave coaxial resonant cavity, and two mutually symmetrical coupling holes are provided on the closed conductor at one end. The coupling ring is inserted into the microwave coaxial resonant cavity through the two coupling holes.

[0014] In some embodiments, the microwave coaxial resonant cavity structure is made of a metallic conductor.

[0015] In some embodiments, the metallic conductor includes one of iron, aluminum, copper, titanium, silver, gold, etc.

[0016] In some embodiments, the microwave coaxial resonant cavity structure is made of a non-silver, non-gold metal conductor, and its surface may be plated with a layer of silver or gold.

[0017] In some embodiments, two rows of vent holes are symmetrically arranged on the wall of the annular outer conductor, with 3-6 vent holes in each row. The vent holes are circular, and their diameter is equal to the diameter of the cylindrical inner conductor.

[0018] In some embodiments, the microwave coaxial resonant cavity structure has four exhaust holes evenly distributed around its circumference on one end of the closed conductor without a coupling hole.

[0019] In some embodiments, the propeller is a propeller equipped with a motor.

[0020] In some embodiments, the probe assembly is further provided with a temperature sensor for detecting the temperature of the lubricating oil.

[0021] In some embodiments, the microprocessor in the detection host is an STM32, the analog-to-digital converter is an AD7689ACPZ, and the Ethernet chip is a W5500.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. This utility model discloses a lubricating oil quality testing device for rotating components of a wind turbine. The probe assembly is set in the lubricating oil tank and immersed in the lubricating oil. Through the rotation of the propeller, the lubricating oil flows quickly through the detection tube, enabling the microwave probe in the detection tube to perform real-time online detection, thereby improving the detection efficiency.

[0024] 2. This utility model discloses a lubricating oil quality testing device for rotating components of a wind turbine. The microwave probe in the probe assembly adopts a microwave coaxial resonant cavity structure and coupling ring. By measuring the resonant frequency of the coaxial resonant cavity sensor, the water content in the lubricating oil can be indirectly determined, enabling online testing of lubricating oil quality. It features no reagents required, no sampling required, high sensitivity, good environmental adaptability, low cost, and easy maintenance, making it very suitable for on-site online measurement.

[0025] 3. The present invention relates to a lubricating oil quality testing device for rotating components of a wind turbine generator. The main testing unit can calculate the data detected by the microwave probe in the probe assembly in real time and transmit it to the next level via Ethernet, thereby realizing online real-time testing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the microwave probe of this utility model;

[0028] Figure 3 for Figure 2 Sectional view along line AA;

[0029] Figure 4 for Figure 2 Sectional view along the BB direction;

[0030] Figure 5 This is a connection block diagram of the present invention;

[0031] Figure 6 This is a schematic diagram of the present invention located inside the lubricating oil tank.

[0032] In the diagram: 1. Probe assembly; 11. Microwave probe; 111. Microwave coaxial resonant cavity structure; 1111. Cylindrical inner conductor; 1112. Circular outer conductor wall; 1113. Enclosed conductor; 1114. Coaxial resonant cavity; 1115. Vent hole; 1116. Coupling hole; 112. Coupling ring; 12. Propeller; 13. Detection tube; 14. Connecting tube; 15. Connecting flange; 2. Connecting cable; 21. Microwave transmission line; 22. Propeller cable; 3. Detection host; 31. Microprocessor; 32. Microwave RF module; 33. Analog-to-digital converter module; 34. Power supply module; 35. Ethernet chip. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0034] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0035] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0036] The silicon-titanium powder cake is a cake produced by pressing with a filter press. For example, a cake pressed by a 300-square filter press is a square cake with a side length of 300 mm and a thickness of 30-40 mm. In the following examples, the size of the silicon-titanium powder cake is based on this specification.

[0037] During the normal drying process, the silicon-titanium powder mud cakes are laid flat in the drying area with a certain gap between them to ensure that they can be turned over normally without colliding with adjacent mud cakes.

[0038] Example:

[0039] Please refer to Figures 1-5 According to one aspect of this application, one embodiment provides a device for testing the quality of lubricating oil in rotating components of a wind turbine, including a probe assembly 1, a connecting cable 2, and a testing host 3;

[0040] The probe assembly 1 includes a microwave probe 11, a propeller 12, a detection tube 13, a connecting tube 14, and a connecting flange 15. The propeller 12 is a propeller with a motor, i.e., a propeller used in underwater robots. The detection tube 13 is a circular tube with an inner diameter of 80 mm and a length of 100 mm. The microwave probe 11 is disposed inside the detection tube 13, and the propeller 12 is disposed at one end of the detection tube 13. The connecting tube 14 is connected to the detection tube 13 in a T-shape, and the connecting flange 15 is provided at the end of the connecting tube 14 away from the detection tube 12. The rotation of the propeller 12 allows lubricating oil to flow inside the detection tube 13 and through the microwave probe 11.

[0041] The probe assembly 1 also includes a temperature sensor, which is a thermistor temperature sensor, attached to the inner wall of the detection tube 13. This sensor is used to detect the temperature of the lubricating oil.

[0042] The microwave probe 11 includes a microwave coaxial resonant cavity structure 111 and a coupling ring 112;

[0043] The microwave coaxial resonant cavity structure 111 comprises a cylindrical inner conductor 1111, an annular outer conductor wall 1112, and closed conductors 1113 at both ends. The cylindrical inner conductor 1111 has a diameter of 5.0 mm and a height of 46.0 mm. The annular outer conductor wall 1112 has an outer diameter of 26.0 mm, an inner diameter of 18.0 mm, and a height of 46.0 mm. The closed conductors 1113 have a diameter of 26.0 mm and a thickness of 4.0 mm. The cylindrical inner conductor 1111 is located at the center of the annular outer conductor wall 1112. The two closed conductors 1113 at both ends of the annular outer conductor wall 1112 are... The open end is closed by a closed conductor 1113. The two ends of the cylindrical inner conductor 1112 are respectively connected to the closed conductors 1113 at both ends. The internal space is a microwave resonant cavity 1115. Two symmetrical coupling holes 1116 are provided on one end of the closed conductor 1113. The distance from the center of the coupling hole 1116 to the axis of the cylindrical inner conductor 1111 is 6.0 mm. The diameter of the coupling hole 1116 is 4.0 mm. The coupling ring 112 is inserted into the microwave coaxial resonant cavity 1115 through the two coupling holes 1116. The depth of the coupling ring 1116 in the microwave coaxial resonant cavity 1115 can be adjusted by adjusting the depth of the coupling ring 1116 in the microwave coaxial resonant cavity 1115.

[0044] The microwave coaxial resonant cavity structure 111 is made of copper and plated with a 0.2-micrometer-thick layer of gold to increase conductivity.

[0045] Two rows of vent holes 1115 are symmetrically arranged on the annular outer conductor wall 1112, with four vent holes 1115 in each row. The vent holes 1115 are circular, and their diameter is equal to the diameter of the cylindrical inner conductor 1111.

[0046] The microwave coaxial resonant cavity structure 111 has four exhaust holes 1115 on the closed conductor 1113 at one end without the coupling hole 1116, which are evenly distributed around the circumference of a circle with a radius of 9.0 mm.

[0047] The connecting line 2 includes a microwave transmission line 21 and a propeller wire 22. The microwave transmission line 21 and the propeller wire 22 are passed through the connecting tube 14 of the probe assembly 1 and are respectively connected to the microwave probe 11 and the propeller 12 in the detection tube 13.

[0048] The detection host 3 includes a microprocessor 31, a microwave radio frequency module 32, an analog-to-digital converter module 33, a power supply module 34, and an Ethernet chip 35. The power supply module 34 is connected to the microprocessor 31, the microwave radio frequency module 32, the analog-to-digital converter module 33, and the Ethernet chip 35. The microprocessor 31 is connected to the microwave radio frequency module 32, the digital conversion module 33, and the Ethernet chip 35. The microwave radio frequency module 32 is connected to the microwave probe 11 of the probe assembly 1 via a microwave transmission line 21. The power supply module 24 is connected to the propeller 12 of the probe assembly 1 via a propeller wire 22.

[0049] In the detection host 3, the microprocessor 31 is an STM32F446VET6, the analog-to-digital converter module 33 is an AD7689ACPZ, and the Ethernet chip 35 is a W5500.

[0050] This invention relates to a device for testing the quality of lubricating oil in rotating components of a wind turbine. The microwave probe has a microwave resonant cavity, which is a hollow chamber composed of a cylindrical inner conductor and an outer conductor wall. High-frequency electromagnetic waves resonate when they enter this cavity. Unlike other integrated resonators, the electric and magnetic fields of the coaxial resonant cavity cannot be separated in space. Therefore, electrodynamic equations must be used to solve the electromagnetic model of the coaxial resonant cavity. When the boundary conditions of the outer wall of the coaxial resonant cavity are determined, and the conductivity and permeability of the dielectric material inside the cavity are known, the resonance parameters and electromagnetic field distribution within the cavity can be obtained.

[0051] A microwave coaxial resonant cavity consists of a coaxial line whose two ends are simultaneously sealed and short-circuited by metal conductors. A coupling hole is opened at the bottom of the cavity, and a coupling structure is inserted into the cavity for microwave frequency input and output. When the volume fraction of each component of the uniformly filled medium in the cavity changes, the dielectric properties will change, the electromagnetic field between the inner and outer conductors will be disturbed, and thus the resonant frequency will change.

[0052] For lubricating oil, when the structure of the resonant cavity and the temperature of the lubricating oil are fixed, the dielectric constant of the oil-water mixture will change with the variation of the trace water content, causing a shift in the resonant frequency of the coaxial cavity. Therefore, the trace water content of the lubricating oil can be indirectly determined by measuring the resonant frequency of the coaxial resonant cavity sensor.

[0053] Please refer to Figure 6 This utility model discloses a device for detecting the quality of lubricating oil in rotating parts of a wind turbine. In use, the probe assembly is placed in the lubricating oil tank, and the detection tube is immersed in the lubricating oil. The device can detect the water content of the lubricating oil by means of the propeller rotation causing the lubricating oil to flow through the detection tube.

[0054] In a wind turbine, there are many rotating parts and possibly multiple lubricating oil tanks. Each oil tank can contain a detection device of this invention, which can realize online detection of the lubricating oil of the rotating parts.

[0055] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A device for testing the quality of lubricating oil in rotating components of a wind turbine generator, characterized in that: The probe assembly (1), the connecting cable (2) and the detection host (3) are included. The probe assembly (1) comprises a microwave probe (11), a propeller (12), a detection tube (13), a connecting tube (14) and a connecting flange (15), the microwave probe (11) is arranged in the detection tube (13), the propeller (12) is arranged at one end of the detection tube (13), the connecting tube (14) is connected with the detection tube (13) in a T-shaped manner, and the connecting tube (14) is provided with the connecting flange (15) away from one end of the detection tube (13). The connecting cable (2) comprises a microwave transmission line (21) and a propeller wire (22), the microwave transmission line (21) and the propeller wire (22) are inserted into the connecting tube (14) of the probe assembly (1) and are connected with the microwave probe (11) and the propeller (12) in the detection tube (13) respectively. The detection host (3) comprises a microprocessor (31), a microwave radio frequency module (32), an analog-to-digital conversion module (33), a power module (34) and an Ethernet chip (35), the power module (34) is connected with the microprocessor (31), the microwave radio frequency module (32), the analog-to-digital conversion module (33) and the Ethernet chip (35), the microprocessor (31) is connected with the microwave radio frequency module (32), the analog-to-digital conversion module (33) and the Ethernet chip (35), the microwave radio frequency module (32) is connected with the microwave probe (11) of the probe assembly (1) through the microwave transmission line (21), and the power module (34) is connected with the propeller (12) of the probe assembly (1) through the propeller wire (22).

2. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 1, characterized in that: The microwave probe (11) comprises a microwave coaxial resonant cavity structure (111) and a coupling ring (112), the microwave coaxial resonant cavity structure (111) comprises a cylindrical inner conductor (1111), a circular ring-shaped outer conductor wall (1112) and closed conductors (1113) at two ends, the cylindrical inner conductor (1111) is arranged at the center of the circular ring-shaped outer conductor wall (1112), two open ends of the circular ring-shaped outer conductor wall (1112) are closed by the closed conductors (1113), the two ends of the cylindrical inner conductor (1111) are connected with the closed conductors (1113) at the two ends respectively, an internal hollow cavity is a microwave coaxial resonant cavity (1114), two symmetrical coupling holes (1116) are arranged on one end of the closed conductor, and the coupling ring (112) is inserted into the microwave coaxial resonant cavity (1114) through the two coupling holes (1116).

3. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 2, characterized in that: The microwave coaxial resonant cavity structure (111) is made of a metal conductor.

4. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 3, characterized in that: The metal conductor comprises one of iron, aluminum, copper, titanium, silver and gold.

5. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 3, characterized in that: After the microwave coaxial resonant cavity structure (111) is made of a metal conductor other than silver and gold, a surface thereof can be plated with a layer of silver or gold.

6. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 2, characterized in that: The circular ring-shaped outer conductor wall (1112) is symmetrically provided with two rows of exhaust holes (1115), each row of exhaust holes (1115) has 3-6, the exhaust hole (1115) is circular, and the diameter is equal to the diameter of the cylindrical inner conductor (1111).

7. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 2, characterized in that: The end of the microwave coaxial resonant cavity structure (111) not provided with the coupling hole (1116) is closed, and the closed conductor (1113) is provided with four exhaust holes (1115) which are uniformly distributed in the circumference.

8. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 1, characterized in that: The propeller (12) is a propeller with a motor.

9. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 1, characterized in that: The probe assembly (1) is also provided with a temperature sensor.

10. A device for detecting the quality of lubricating oil for rotating parts of a wind power generator according to claim 1, characterized in that: In the detection host (3), the model of the microprocessor (31) is STM32, the model of the analog-to-digital conversion module (33) is AD7689ACPZ, and the Ethernet chip (35) is W5500.

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