Oil leakage prevention intelligent measurement and control device for wind power gear box

Abstract

The invention relates to an intelligent measurement and control device for preventing oil leakage of a wind power gear box, which is used for the wind power gear box, and comprises a multifunctional front-end device which has elasticity and is used for being detachably connected with the wind power gear box, and the interior of the multifunctional front-end device is communicated with the interior of the wind power gear box; an inlet of the vacuum pump is communicated with the multifunctional front-end device, an outlet of the vacuum pump is communicated with the outside, and under suction of the vacuum pump, gas in the wind power gear box enters the multifunctional front-end device, is filtered by the multifunctional front-end device and then is discharged to the outside through the vacuum pump; and the pressure detection system is used for detecting the pressure in the wind power gear box and controlling a vacuum pump to start and stop according to the pressure. Under the condition that the main body structure of the wind power gear box is not changed, only the intelligent measurement and control device for preventing oil leakage of the wind power gear box needs to be installed on the wind power gear box, and the problem of sealing oil leakage of the wind power gear box can be solved without any abrasion, shutdown and disassembly and installation.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power gearbox anti-leakage, and in particular to an intelligent measurement and control device for preventing oil leakage of a wind power gearbox. Background Art

[0002] The wind turbine gearbox is one of the core components of the wind turbine. It is used to transfer the high torque kinetic energy of the wind rotor at low speed to the generator that needs to run at high speed, thereby improving the power generation efficiency. The wind turbine gearbox is subject to huge loads and impacts, so its reliability directly affects the safe operation and power generation efficiency of the wind turbine. The gearbox is an important mechanical transmission component in the wind turbine. Usually, the speed of the wind rotor is very low, far from the speed required by the wind turbine generator. It must be achieved through the speed increase transmission of the gearbox, so the gearbox is also called a speed increaser. Since wind turbines are installed in windy places such as mountains, wilderness, deserts, lakes, beaches, and islands, they are subject to irregular wind forces of changing direction and load and the impact of strong gusts. They are affected by severe cold and heat and the temperature difference between day and night all year round. In addition, the natural environment has inconvenient transportation, high-altitude operations, and inconvenient maintenance. Therefore, the design and production technology as well as the installation and operation and maintenance technology of the gearbox are particularly high. The lubricating oil system of the gearbox is one of the most critical technologies to ensure stable operation. The measurement and control of operating parameters such as lubricating oil pressure, temperature, and oil level are important technical conditions to ensure the safe and stable operation of the gearbox. On the contrary, leakage of gearbox lubricating oil due to seal failure causes internal pollution of the wind turbine cabin, aggravates the wear of gears and bearings, and causes the gearbox to heat up. Lubricating oil leakage is one of the biggest safety hazards encountered during the safe and stable operation of the gearbox.

[0003] There are two main risks of gearbox oil leakage: (1) The leakage of lubricating oil in wind turbine gearbox will directly affect the drop of lubricating oil level, resulting in poor lubrication of gears and bearings, increasing equipment wear and causing high temperature of equipment operation. The leaked lubricating oil will pollute the equipment and the interior of the cabin. The dirt formed is not conducive to the heat dissipation of the equipment. When encountering sparks or high temperature of equipment operation, it is easy to cause serious fire accidents; Lubricating oil leakage is a strictly prohibited phenomenon of running, bubbling, dripping and leaking, which will directly affect the production site environment and safety production and enterprise standardization construction assessment indicators; (2) After the lubricating oil leaks, the machine needs to be shut down to eliminate the defect. Specific maintenance work such as replacing the skeleton oil seal, repairing the shaft seal position, replacing the sealing ring, sealing gasket, sealant, etc. must be completed in the shutdown state. The shutdown process will affect the equipment utilization rate and the power generation efficiency of the wind turbine set.

[0004] There are three main reasons that may cause oil leakage in gearboxes: (1) All types of gearboxes have at least one input drive shaft and one output drive shaft connected to the external equipment of the gearbox. The drive shaft seals are sealed with skeleton oil seals. The lubricating oil level in the gearbox is generally required to be in contact with the shaft. Even if the highest oil level does not contact the shaft, during operation, the high-speed gear rotation centrifugal force and the planetary gear operation drive the lubricating oil to splash around in the gearbox and drip onto the sealing position. After long-term high-speed and uninterrupted operation of the gearbox, the oil seal will age and fail, the oil seal will wear, the shaft oil seal position will wear, etc., resulting in oil seal failure and oil leakage at the shaft seal. (2) In order to facilitate assembly and maintenance, all types of gearboxes are designed to be split into multiple parts. In a gearbox structure, seals need to be installed between each contact surface of the assembly. Generally, gaskets or sealants are used for sealing. After long-term operation, each sealing surface may fail due to improper assembly, vibration during equipment operation, thermal expansion and contraction caused by frequent equipment start-up and stop, or corrosion and aging of the seal, resulting in frequent oil leakage from the sealing surface. (3) The gearbox body may be equipped with the following peripheral components at different positions: oil drain port, oil level sight glass port, oil level gauge measurement point, temperature measurement point, pressure measurement point, oil pump, oil inlet and outlet of the lubricating oil cooling system, filter screen, valve and lubricating oil pipeline. Due to aging of seals, looseness caused by vibration during equipment operation, improper installation, thermal expansion and contraction caused by frequent equipment start-up and stop, etc., they may become oil leakage points during actual operation, which are potential safety hazards.

[0005] The patent with the publication number CN115717644A discloses an integrated device for preventing oil leakage of a reducer. Through the setting of a vacuum pump and a pressure detection mechanism, the hot air inside the reducer housing is promptly extracted, and the external cold air leaks inward from the shaft seal, which theoretically reduces the operating temperature of the reducer body and protects the long-term stable operation of the reducer. However, due to the harsh and complex working environment of wind turbines, the wind turbine cabin is high above the ground, affected by the uncertain factors of the external wind force, the main engine has large vibration, the cabin space is small, and the temperature difference between day and night is large. In addition, the internal space of the wind turbine cabin is limited, and various electrical equipment and electronic control equipment are installed inside. The space environment quality requirements are high, and oil pollution must not be allowed. It will cause electrical failures at the least and fire accidents at the worst. Therefore, the integrated device for preventing oil leakage is not suitable for the use of wind turbine gearboxes. Summary of the invention

[0006] Based on this, the purpose of the present invention is to provide an intelligent measurement and control device for preventing oil leakage of a wind turbine gearbox. Without changing the main structure of the wind turbine gearbox, it is only necessary to install the intelligent measurement and control device for preventing oil leakage of the wind turbine gearbox of the present invention on the wind turbine gearbox. Without any wear, no need to shut down the machine, and no need to disassemble the machine for installation, the problem of oil leakage in the wind turbine gearbox seal can be solved, and the degree of failure and oil leakage of the seal can be intelligently measured and controlled online, thereby extending the service life of the seal, eliminating safety hazards, reducing the maintenance and overhaul intensity of the wind turbine gearbox, improving power generation efficiency, and improving the economic benefits of the enterprise.

[0007] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides an intelligent measurement and control device for preventing oil leakage of a wind power gearbox, which is used for a wind power gearbox and comprises: The multifunctional preamplifier is elastic and is used for being detachably connected to the wind power gearbox and its interior is communicated with the interior of the wind power gearbox; A vacuum pump, whose inlet is connected to the multifunctional preamplifier and whose outlet is connected to the outside. Under the suction of the vacuum pump, the gas in the wind turbine gearbox enters the multifunctional preamplifier and is filtered by the multifunctional preamplifier and then discharged to the outside through the vacuum pump; and The pressure detection system is used to detect the pressure in the wind power gearbox and control the start and stop of the vacuum pump according to the pressure.

[0008] The wind turbine gearbox oil leakage prevention intelligent measurement and control device of the present invention can directly connect the multifunctional preamplifier to the wind turbine gearbox without affecting the main structure of the wind turbine gearbox, without adding oil seals and sealing components, without any wear, without stopping the machine, and without disassembling the machine. By utilizing the elastic deformation effect of the multifunctional preamplifier, when encountering strong vibrations during the operation of the wind turbine gearbox, the elastic deformation characteristics of the multifunctional preamplifier can absorb the vibration intensity of the lower wind turbine gearbox, so as to achieve the purpose of stable shaking of the upper end of the device of the present invention, play a role in protecting the device of the present invention from mechanical vibration, and ensure the long-term stable operation of the main components and working circuits inside the device; at the same time, the inside of the wind turbine gearbox is sucked to a slightly negative pressure state by a vacuum pump, and the outside air will be sucked out from the various sealing components of the wind turbine gearbox. The air outside the wind turbine gearbox is used as the plugging source to achieve a gas sealing effect without dead angle, without distinction, and in all directions, so as to achieve the purpose of anti-leakage oil and gas sealing of the wind turbine gearbox. It is a technical effect that cannot be matched by conventional plugging technology. It is a subversive technical means. It can extend the service life of wind turbine gearbox oil seals and sealing components, reduce the frequency of maintenance, save equipment maintenance costs, increase the utilization rate of main equipment of wind turbine sets, avoid unplanned shutdowns, and improve the economic benefits of enterprises. It eliminates the hidden dangers of oil leakage in wind turbine gearboxes, avoids leakage, avoids environmental pollution inside the wind turbine cabin, and uncontrolled pollution of electromechanical equipment, reduces the risk of fire, and eliminates safety hazards. It is of great significance to improving the on-site environment and safe production.

[0009] As a further improvement of the above-mentioned scheme of the present invention, the wind turbine gearbox has an exhaust hole; the multifunctional preamplifier includes an elastic shell, the elastic shell is formed with a connecting stud one for connecting to the exhaust hole, and the connecting stud one is penetrated by an air intake hole connecting the elastic shell and the wind turbine gearbox.

[0010] As a further improvement of the above solution of the present invention, a sealing ball capable of sealing the air inlet hole is arranged in the elastic shell, and the sealing ball can float under the suction of a vacuum pump; And / or, the elastic shell includes a lower end cover, a bellows and an upper end cover, the two ends of the bellows are respectively connected to the upper end cover and the lower end cover, and a connecting stud 1 for connecting to the exhaust hole is formed on the lower end cover.

[0011] As a further improvement of the above-mentioned scheme of the present invention, the wind turbine gearbox anti-leakage intelligent measurement and control device also includes a protective shell, the vacuum pump is installed in the protective shell, and an exhaust pipeline and an exhaust pipeline are formed on the protective shell. One end of the exhaust pipeline is connected to the air outlet of the oil mist filter and the other end is connected to the inlet of the vacuum pump through an air intake elastic hose. One end of the exhaust pipeline is connected to the outlet of the vacuum pump through an exhaust elastic hose and the other end is connected to the outside world.

[0012] As a further improvement of the above solution of the present invention, the wind turbine gearbox anti-leakage oil intelligent measurement and control device also includes a battery, which is installed in the protective housing and is used to power the vacuum pump and the pressure detection system; And / or, the wind turbine gearbox anti-leakage oil intelligent measurement and control device also includes an air purifier, which is installed on the protective shell and its air inlet is connected to the other end of the exhaust pipeline.

[0013] As a further improvement of the above solution of the present invention, the pressure detection system includes a pressure sensor and a control mainboard; the pressure sensor is installed on the protective housing and is used to detect the pressure in the exhaust pipeline; the control mainboard is installed in the protective housing and connected to the pressure sensor and the vacuum pump, and the control mainboard is used to obtain the pressure detected by the pressure sensor and compare the pressure with the pressure setting value: when the pressure is less than the pressure setting value, the control mainboard controls the vacuum pump to stop; when the pressure is greater than or equal to the pressure setting value, the control mainboard controls the vacuum pump to start. The pressure sensor and the control mainboard are powered by a battery.

[0014] As a further improvement of the above solution of the present invention, the pressure detection system further comprises a diaphragm pressure gauge, the diaphragm pressure gauge is mounted on the protective housing and its air inlet is connected to the air extraction pipeline; And / or, the wind turbine gearbox anti-leakage oil intelligent measurement and control device further comprises a display screen for displaying the pressure and the set value, the display screen being mounted on the protective housing and connected to the control mainboard; As a further improvement of the above-mentioned solution of the present invention, the wind turbine gearbox anti-leakage oil intelligent measurement and control device also includes a remote host computer, and the control mainboard is also used to record the cumulative number of starts and the cumulative working time of the vacuum pump within a predetermined time, and the control mainboard calculates the sealing efficiency of the wind turbine gearbox according to the cumulative working time of the vacuum pump within the predetermined time. Seal failure rate ,in, λ 有效 Represents the sealing efficiency. λ 失效 represents the sealing failure rate, T represents the predetermined time, and N represents the cumulative working time of the vacuum pump within the predetermined time; the control main board also compares the calculated sealing effectiveness with the preset alarm value. When the sealing effectiveness is less than or equal to the alarm value, the control main board sends an alarm signal to the remote host computer.

[0015] As a further improvement of the above-mentioned scheme of the present invention, a pressure-inducting hole connected to the exhaust pipe is formed through machining at one end of the protective shell close to the multi-functional preamplifier, and the pressure sensor is cooperatively connected to the end of the pressure-inducting hole away from the exhaust pipe; an outer wall of an end of the protective shell close to the multi-functional preamplifier is formed through machining to have an installation screw hole connected to the pressure-inducting hole and used for installing a diaphragm box pressure gauge.

[0016] As a further improvement of the above-mentioned scheme of the present invention, the protective shell includes a lower shell, an upper shell and a sealing cover; a connecting screw hole connected to the interior of the multifunctional preamplifier is provided on the upper shell; one end of the lower shell is open and a connecting stud 2 is formed at the other end, and the connecting stud 2 is threadedly connected to the connecting screw hole. The end of the lower shell close to the multifunctional preamplifier is formed by machining with two through holes extending from its inner bottom surface to the outside, and the two through holes are respectively used as an exhaust pipeline and an exhaust pipeline. The exhaust pipeline passes through the connecting stud 2 and is connected to the interior of the multifunctional preamplifier, and a section of the exhaust pipeline located in the connecting stud 2 is provided with an internal thread; both ends of the upper shell are open and the two ends are respectively threadedly connected to the open end of the lower shell and the sealing cover; the vacuum pump is installed in the lower shell, and the air outlet end of the oil mist filter is threadedly connected to the internal threaded section of the exhaust pipeline.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The wind turbine gearbox oil leakage prevention intelligent measurement and control device of the present invention can directly connect the multifunctional preamplifier to the wind turbine gearbox without affecting the main structure of the wind turbine gearbox, without adding oil seals and sealing components, without any wear, without stopping, and without disassembling. By utilizing the elastic deformation effect of the multifunctional preamplifier, when encountering strong vibrations during the operation of the wind turbine gearbox, the elastic deformation characteristics of the multifunctional preamplifier can absorb the vibration intensity of the lower end wind turbine gearbox, thereby achieving the purpose of stable shaking of the upper end of the device of the present invention, playing a role in protecting the device of the present invention from mechanical vibration, and ensuring the long-term stable operation of the main components and working circuits inside the device.

[0018] 2. The wind turbine gearbox anti-leakage intelligent measurement and control device of the present invention filters the oil mist gas in the wind turbine gearbox through the multifunctional preamplifier, and then discharges it through the vacuum pump, so as to meet the high requirements for the quality of the internal space environment of the wind turbine cabin and avoid oil pollution. At the same time, the oil and gas in the wind turbine gearbox are filtered by the oil mist filter, and the oil molecules are left outside the filter screen. Under the influence of gravity, the accumulated oil outside the filter screen will drip into the lower end cover of the multifunctional preamplifier. The lower end cover is a hemispherical bowl-shaped structure. When the accumulated oil level reaches a certain height, the accumulated oil will float the sealing ball (at this time, the sealing ball plays the role of the oil return float), thereby opening the air intake hole, and the accumulated oil will flow back into the wind turbine gearbox through the air intake hole. Of course, during the vacuum pump exhaust process, the sealing ball will be pumped up, and the gap between the sealing ball and the lower end cover will also produce oil return, which ensures that the lubricating oil in the wind turbine gearbox does not leak and ensures that the lubricating oil in the wind turbine gearbox is at a normal working oil level.

[0019] 3. The present invention uses a vacuum pump to suck the inside of the wind turbine gearbox to a slightly negative pressure state, and the outside air will penetrate into the wind turbine gearbox through the tiny gaps of the sealing components of the wind turbine gearbox, allowing the air outside the wind turbine gearbox to be used as a blocking source, thereby achieving an air sealing effect without dead angles, without distinction, and in all directions, thereby achieving the purpose of anti-leakage oil and gas sealing of the wind turbine gearbox. This is a technical effect that conventional blocking technologies cannot match, and it is a subversive technical means that can extend the service life of wind turbine gearbox oil seals and sealing components, reduce the frequency of maintenance, save equipment maintenance costs, increase the utilization rate of main equipment of wind turbine sets, avoid unplanned shutdowns, and improve the economic benefits of enterprises, eliminate the hidden dangers of oil leakage in wind turbine gearboxes, avoid leakage, avoid environmental pollution inside the wind turbine cabin and uncontrolled pollution of electromechanical equipment, reduce the risk of fire, and eliminate safety hazards, which is of great significance to improving the on-site environment and safe production. After the vacuum pump continuously pumps, the pressure in the wind turbine gear box drops to the pressure setting value, and the vacuum pump stops working and is in standby state. At this time, the negative pressure value in the wind turbine gear box has achieved the purpose of air sealing and oil leakage prevention. In order to maintain the micro-negative pressure state in the wind turbine gear box, the pressure detection system intermittently starts the vacuum pump to perform air extraction to prevent the wind turbine gear box from failing in sealing, causing external gas to reversely release pressure into the wind turbine gear box and destroy the micro-negative pressure sealing conditions in the wind turbine gear box.

[0020] 4. The present invention also provides an air purifier. The gas from the wind turbine gearbox is first deoiled by an oil mist filter, then enters a vacuum pump and is pumped to the air purifier. The air purifier absorbs oil odor and water vapor and then exhausts the gas, thereby achieving the cleaning purposes of deoiling, dehumidifying, and deodorizing, and achieving environmentally friendly emission standards.

[0021] 5. The control mainboard of the present invention records the cumulative working time of the vacuum pump within a predetermined time and calculates the sealing efficiency of the wind turbine gearbox according to the cumulative working time of the vacuum pump within the predetermined time. It can predict the failure of the wind turbine gearbox seal in advance and send out an alarm signal, ensuring that the gearbox can be maintained and repaired in time to provide accurate data and avoid major safety operation accidents.

[0022] 6. The arrangement of the sealing ball in the multifunctional preamplifier of the present invention, when the device of the present invention needs temporary online inspection and maintenance, such as replacing the oil mist filter or replacing the activated carbon adsorbent of the air purifier, it is necessary to disassemble the upper end cover of the multifunctional preamplifier online to extract the oil mist filter for replacement or open the air purifier to remove the activated carbon adsorbent. At this time, in order to ensure the normal operation of the wind turbine gearbox and ensure that the negative pressure seal inside the wind turbine gearbox is normal, the sealing ball is affected by gravity and freely falls into the sealing groove to seal the air inlet hole, preventing external air from entering the wind turbine gearbox, thereby achieving the purpose of one-way sealing and pressure maintenance.

[0023] 7. Compared with the existing integrated device for preventing oil seepage of reducer, the present invention is provided with a multifunctional preamplifier which has multiple functions such as shockproof, oil removal, oil collection, oil return and one-way valve. The overall design of the multifunctional preamplifier is compact and ingenious, and it is an important pre-mechanical protection device for the operation of the main engine. The number of times the vacuum pump is switched on and off and the working time of the vacuum pump within 24 hours are accumulated, and the sealing efficiency or sealing failure rate is obtained through programming with the formula editor software. After the data is quantified, it is remotely transmitted to the host computer, mobile terminal or smart management platform to meet the data conditions required for intelligent management and monitoring. A multifunctional preamplifier and an air purifier are added to meet the high requirements for the environmental quality of the internal space of the wind turbine cabin and avoid oil pollution. The suction and exhaust pipelines are optimized, integrally cast, and machined and punched to reduce the number of joints and reduce the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an intelligent measurement and control device for preventing oil leakage in a wind power gearbox according to an embodiment of the present invention; Figure 2 for Figure 1 Side view of Figure 3 for Figure 1 A top view of Figure 4 for Figure 3 Middle AA section view; Figure 5 for Figure 1 Middle BB section view.

[0025] Reference numerals: 1. Multifunctional preamplifier; 110. Lower end cover; 111. Connecting stud 1; 112. Air inlet hole; 113. Sealing groove; 114. Sealing sphere; 120. Bellows; 130. Upper end cover; 140. Flange; 2. Protective shell; 210. Lower shell; 211. Air extraction pipeline; 212. Exhaust pipeline; 213. Pressure-inducing hole; 214. Mounting screw hole; 215. Connecting stud 2; 220. Upper shell; 230. Cover; 3. Vacuum pump; 301. Air intake elastic hose; 302. Air exhaust elastic hose; 4. Pressure detection system; 410. Pressure sensor; 420. Control main board; 430. Diaphragm pressure gauge; 5. Oil mist filter; 6. Battery; 7. Air purifier; 8. Display screen; 9. Communication antenna. DETAILED DESCRIPTION

[0026] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] In view of the oil leakage in the current gearbox, this embodiment proposes an intelligent measurement and control device for preventing oil leakage in a wind turbine gearbox, which is used for preventing oil leakage in a wind turbine gearbox. Generally, when the wind turbine gearbox is turned on and running, the meshing of the gears and the rotation of the bearings in the wind turbine gearbox will generate friction and temperature rise, which will cause the temperature in the wind turbine gearbox to rise. The air in the wind turbine gearbox will expand and generate internal pressure. In order to ensure the sealing operating conditions of the seal, the wind turbine gearbox needs to maintain a normal pressure state. Therefore, an exhaust hole will be opened on the wind turbine gearbox, and a breathable cap or air filter will be installed. The hot air will be discharged through the breathable cap to achieve the purpose of maintaining a normal pressure state inside the wind turbine gearbox.

[0029] Reference Figure 1-Figure 4 The wind turbine gearbox anti-leakage oil intelligent measurement and control device of this embodiment includes a multifunctional preamplifier 1, a protective housing 2, a vacuum pump 3 and a pressure detection system 4, and may also include a battery 6, an air purifier 7 and a remote host computer.

[0030] The multifunctional preamplifier 1 includes an elastic shell and an oil filter 5. The elastic shell includes a lower end cover 110, a bellows 120, an upper end cover 130 and a flange 140. The two ends of the bellows 120 are integrally connected to the upper end cover 130 and the flange 140 respectively. In this embodiment, the lower end cover 110 has an arc-shaped cross-section, and a connecting stud 111 is formed on the side of the lower end cover 110 away from the bellows 120. The outer surface of the connecting stud 111 is provided with an external thread and an air intake hole 112 is penetrated. A sealing groove 113 is formed on the inner side wall of the lower end cover 110 at a position corresponding to the air intake hole 112, and a sealing ball 114 is movably arranged in the sealing groove 113. The sealing ball 114 is made of polytetrafluoroethylene or a hollow steel ball. The upper end cover 130 is connected to the flange 140 by bolts, and the upper end cover 130 is penetrated with a connecting screw hole and the flange 140 is penetrated with a through hole coaxial with the connecting screw hole. The oil mist filter 5 is assembled in the bellows 120 .

[0031] The above-mentioned structure of the multifunctional preamplifier 1 can be directly connected to the existing exhaust hole of the wind power gearbox (the exhaust hole of the wind power gearbox is provided with internal threads) when connected to the wind power gearbox, so that the connection between the wind power gearbox oil leakage prevention intelligent measurement and control device of this embodiment and the wind power gearbox can be realized. At this time, the sealing ball 114 can be used as a one-way valve sealing core to allow the gas in the wind power gearbox to enter the bellows 120 from the air inlet hole 112. The bellows 120 of the multifunctional preamplifier 1 is set. When the wind power gearbox is strongly vibrated during operation, the vibration intensity of the wind power gearbox at the lower end is absorbed through the distortion and deformation characteristics of the bellows 120 structure, so as to achieve the purpose of stable shaking of the upper end, play a role in protecting the main machine of the device of the present invention from mechanical vibration, and ensure the long-term stable operation of the main components and working circuits inside the main machine.

[0032] The protective housing 2 includes a lower shell 210, an upper shell 220 and a cover 230. The lower shell 210 is cylindrical, and a second connecting stud 215 is formed at one end of the lower shell 210. The second connecting stud 215 is threadedly connected to the connecting screw hole of the upper end cover 130. The bottom of the lower shell 210 is formed with two through holes by machining, and the two through holes serve as an exhaust pipeline 211 and an exhaust pipeline 212 respectively. The exhaust pipeline 211 extends from the inner bottom surface of the lower shell 210 to the inside of the second connecting stud 215 and penetrates the second connecting stud 215. The exhaust pipeline 211 is connected to the inside of the bellows 120 through the through hole of the flange 140, and the exhaust pipeline 212 extends from the inner bottom surface of the lower shell 210 to the bottom side of the lower shell 210 and penetrates the lower shell 210. A pressure-inducing hole 213 is also formed at the bottom of the lower shell 210 by machining, and the pressure-inducing hole 213 extends from the inner bottom surface of the lower shell 210 to the inside and communicates with the exhaust pipeline 211. The bottom side of the lower shell 210 is machined to form a mounting screw hole 214 that is connected to the pressure-inducing hole 213. The other end of the lower shell 210 is open and the outer circumference of the open end is formed with an external thread. The upper shell 220 is also cylindrical, and both ends of the upper shell 220 are open. The inner circumference of one end of the upper shell 220 is provided with an internal thread and the end is threadedly connected to the open end of the lower shell 210. The outer circumference of the other end of the upper shell 220 is provided with an external thread and the cover 230 is threadedly connected to the external thread end of the upper shell 220. To facilitate the connection between the upper shell 220 and the lower shell 210, and the connection between the cover 230 and the upper shell 220, a plurality of concave-convex anti-slip grooves are circumferentially provided on the outer circumferential surface of the internal threaded end of the upper shell 220 and the outer circumferential surface of the cover 230 to facilitate manual tightening and loosening with a special wrench. A plurality of groups of grooves are also provided on the end surface of the cover 230, each group having two grooves and the two grooves are symmetrically arranged about the central axis of the cover 230 to facilitate tightening and loosening with a screwdriver lever, so as to realize the connection and disassembly of the cover 230 and the upper shell 220.

[0033] In this embodiment, an internal thread is provided at one end of the air extraction pipeline 211 close to the bellows 120, and the air outlet end of the oil mist filter 5 passes through the through hole of the flange 140 and is threadedly connected to the internal thread section of the air extraction pipeline 211. The air purifier 7 is installed outside the lower housing 210, and the air inlet of the air purifier 7 is connected to the exhaust pipeline 212 and its air outlet is connected to the outside.

[0034] The vacuum pump 3 is installed in the lower housing 210, combined with Figure 5 The inlet of the vacuum pump 3 is connected to the exhaust pipeline 211 through the air intake elastic hose 301, and the outlet is connected to the exhaust pipeline 212 through the exhaust elastic hose 302. The air intake elastic hose 301 and the exhaust elastic hose 302 are both non-metallic tubes. Since the micro vacuum pump 3 is frequently started, the motor will cause self-vibration at the moment of starting and stopping. In order to avoid the rigid connection between the vacuum pump 3 and the lower shell 210, which is easy to damage the micro motor, the micro vacuum pump 3 is connected to the exhaust pipeline 211 and the exhaust pipeline 212 through the air intake elastic hose 301 and the exhaust elastic hose 302 respectively, which can effectively eliminate the frequent start and stop of the micro vacuum pump 3 motor and the vibration intensity of the wind turbine gearbox body, and avoid vibration damage caused by vibration of itself or the body.

[0035] Through the above structural arrangement, when the vacuum pump 3 is started, the sealing sphere 114 can float under the suction of the vacuum pump 3, and the oil mist gas in the wind power gear box will enter the bellows 120 through the air inlet hole 112, and after the oil mist is filtered out by the oil mist filter 5, it will be discharged from the exhaust pipe 211, the vacuum pump 3, the exhaust pipe 212, and the air purifier 7, so that the inside of the wind power gear box is kept in a slightly negative pressure state, and the external ambient air will reversely penetrate into the wind power gear box, so that the shaft seal position of the wind power gear box and the leakage of the sealing surface of the sealing component are sealed to prevent oil leakage, and the air outside the wind power gear box is used as the blocking source to achieve the air sealing effect without dead angle, without difference, and all-round blocking, which is a technical effect that conventional blocking technology cannot match, and is a subversive technical means, which overcomes and solves the gap sealing problem formed by the skeleton oil seal and the sealing component due to wear, aging, mechanical vibration, thermal expansion and contraction.

[0036] Since the internal space of the wind turbine cabin is limited and various electrical equipment and electronic control equipment are installed inside, the space environment quality requirements are high and oil pollution must not be allowed. It may cause electrical failure at the least and fire accidents at the worst. The environment requires that the exhaust of the device of the present invention must ensure environmentally friendly emission standards. By arranging an oil mist filter 5 inside the bellows 120 and arranging an air purifier 7 to be connected to the exhaust pipe 212, the gas of the wind turbine gear box first passes through the oil mist filter 5 for oil removal, and then enters the vacuum pump 3 for extraction to the air purifier 7. The air purifier 7 absorbs oil odor and water vapor and then exhausts the gas, thereby achieving the cleaning purposes of oil removal, dehumidification, deodorization, etc., and achieving environmentally friendly emission standards. At the same time, the oil and gas in the wind power gearbox are filtered by the oil mist filter 5, leaving the oil molecules on the periphery of the filter screen. Under the influence of gravity, the accumulated oil outside the filter screen will drip into the lower end cover 110 of the multi-functional preamplifier 1. The lower end cover 110 is a hemispherical bowl-shaped structure. When the accumulated oil level reaches a certain height, the accumulated oil will float up the sealing ball 114 (at this time, the sealing ball 114 plays the role of an oil return float), thereby opening the air inlet hole 112, and the accumulated oil flows back into the wind power gearbox through the air inlet hole 112. Of course, during the vacuum pump 3 exhaust process, the sealing ball 114 will be pumped up, and the gap between the sealing ball 114 and the lower end cover 110 will also produce oil return, thereby ensuring that the lubricating oil in the wind power gearbox is not lost and the lubricating oil in the wind power gearbox is at a normal working oil level.

[0037] In this embodiment, the air purifier 7 can be an activated carbon air purifier 7. Of course, in other embodiments, the air purifier 7 can also be other forms of air purifier 7, as long as the filtering requirements are met. The pressure detection system 4 includes a pressure sensor 410 and a control mainboard 420. An internal thread is provided at one end of the pressure-introducing hole 213 away from the exhaust pipe 211, and the pressure sensor 410 is connected to the pressure-introducing hole 213 and is used to detect the air pressure in the exhaust pipe 211 in real time. The control mainboard 420 is installed in the upper shell 220 and the control mainboard 420 is connected to the pressure sensor 410 and the vacuum pump 3, and the control mainboard 420 communicates with the remote host computer through the communication antenna 9, and the communication antenna 9 can transmit the measurement and control data of the device of the present invention through 4G or 5G digital communication network technology. The control mainboard 420 is used to obtain the pressure detected by the pressure sensor 410 and compare the pressure with the pressure setting value: when the pressure is less than the pressure setting value, it means that the wind power gearbox has reached a slightly negative pressure state at this time, and the control mainboard 420 controls the vacuum pump 3 to stop. According to the size of the wind power gearbox and the different lubricating oil levels in the wind power gearbox, the pressure setting value is reasonably set to adjust the high and low value range of the micro-negative pressure control. The specific negative pressure setting value is based on the static pressure of the lubricating oil level as a reference value, and the pressure that the negative pressure value can overcome the leakage of the lubricating oil is used as the standard. If the negative pressure setting value is too high, it will affect the working strength of the device of the present invention, and if the negative pressure setting value is too low, it will affect the anti-leakage effect. It should be set appropriately according to the specific working conditions of the on-site equipment. When the seal of a certain part of the wind power gearbox fails, it will cause pressure relief at that place, and the outside air will enter the wind power gearbox from the seal failure point, causing the pressure in the wind power gearbox to increase. At this time, a pressure difference is generated inside and outside the sealing surface of the lightweight sealing ball 114, and the air in the high-pressure area flows to the low-pressure area, so that the lightweight sealing ball 114 will float up, and the pressure in the elastic shell and the exhaust pipeline will change. At this time, the pressure detected by the pressure sensor will be greater than the preset pressure value, and the control mainboard 420 will immediately start the vacuum pump 3 to exhaust the wind power gearbox again to maintain the micro-negative pressure state in the wind power gearbox.

[0038] In addition, the control mainboard 420 also records the cumulative number of starts of the vacuum pump 3 within a predetermined time (24 hours in this embodiment) and the cumulative working time of the vacuum pump 3 within a predetermined time (24 hours in this embodiment). The control mainboard 420 calculates the sealing efficiency of the wind power gearbox according to the cumulative working time of the vacuum pump 3 within 24 hours: Alternatively, the control mainboard 420 calculates the seal failure rate of the wind power gearbox according to the cumulative working time of the vacuum pump 3 within 24 hours: in, λ 有效 Represents the sealing efficiency. λ 失效represents the sealing failure rate, T represents the predetermined time, and N represents the cumulative working time of the vacuum pump within the predetermined time. The units of T and N are consistent. The control mainboard 420 also compares the calculated sealing efficiency with the preset alarm value. When the sealing efficiency is less than or equal to the alarm value, the control mainboard 420 sends an alarm signal to the remote host computer to ensure that accurate data can be provided for timely maintenance and repair of the wind turbine gearbox to avoid major safety operation accidents.

[0039] The storage battery 6 is installed in the upper shell 220, and the storage battery 6 is used to power the control mainboard 420, the vacuum pump 3, the pressure sensor 410, and the display screen 8. When the site has the conditions of external power supply and when the external power supply is normal, the built-in storage battery 6 is automatically charged, and the storage battery 6 is in a standby state after being fully charged; when the external power supply is cut off or the site does not have the conditions of external power supply, the built-in storage battery 6 can be used as a working power supply for temporary emergency work, and the design of two power supplies can adapt to different on-site application conditions and customer needs; in order to facilitate the replacement of the storage battery 6 and take it out for charging, the storage battery 6 is connected to the control mainboard 420 using a soft wire plug-type connection method, which is convenient and quick to plug and unplug. The power supply of the storage battery 6 can be installed when there is no external power supply on site, saving the cost of pulling power cables; when the site has the conditions of external power supply, the storage battery 6 can also be not installed, reducing the overall height and weight of the device and saving the cost of a single machine.

[0040] The wind power gearbox anti-leakage intelligent measurement and control device of this embodiment is also provided with a display screen, and a mounting tube is provided on the lower shell 210. The display screen is installed in the mounting tube and an end of the mounting tube away from the lower shell 210 is threadedly connected with an observation cover, and a glass window is provided on the observation cover for easy viewing. The control mainboard 420 is connected to the display screen, and the control mainboard 420 transmits the pressure signal detected by the pressure sensor 410 to the display screen to display the measured value of the pressure sensor 410 in real time, and the digital accurate reading is displayed. At the same time, the control mainboard 420 also displays the power information of the battery 6 through the display screen. The staff can replace the battery 6 regularly according to the power energy bar information of the battery 6 displayed on the display screen to charge the battery 6. Similarly, in order to facilitate the connection between the observation cover and the mounting tube, a plurality of concave and convex anti-slip grooves are provided in the circumferential direction of the outer circumference of the observation cover to facilitate manual and special wrench tightening and loosening, and a plurality of groups of grooves are provided on the end face of the observation cover, each group has two grooves and the two grooves are symmetrically arranged about the central axis of the observation cover to facilitate the tightening and loosening of the screwdriver lever to realize the connection and disassembly of the observation cover and the mounting tube.

[0041] In this embodiment, the display screen 8 can display a variety of parameter information, such as the battery 6 power, 4G / 5G signal strength, the measurement value of the pressure sensor 410, the pressure setting value and alarm value of the control mainboard 420, the switch action state of the vacuum pump 3, the cumulative number of starts of the vacuum pump 3 within 24 hours, the cumulative working time of the vacuum pump 3 within 24 hours, the sealing efficiency of the wind turbine gearbox and other important technical parameters; at the same time, through the setting of the control mainboard 420, these technical parameters can be selectively transmitted through the analog signal 4-20mA remote transmission, and can also be transmitted through RS485 digital communication technology or 4G / 5 G digital communication network transmits data remotely, and uploads the collected technical data to the remote host computer, smart data management platform or mobile terminal device, providing important technical data support for the smart management platform of wind power enterprises, achieving the data conditions required for intelligent management and monitoring, and enabling operation and maintenance personnel to remotely grasp the current equipment operation status in real time, overcoming the management difficulties of wind turbines due to many inconvenient factors such as wide distribution areas, complex terrain, inconvenient transportation, climate influence, and the need for high-altitude inspections, etc., and being able to discover problems in time and respond quickly to avoid operating safety accidents caused by oil leakage in wind turbine gearboxes, thereby avoiding major economic losses.

[0042] In this embodiment, the pressure detection system 4 also includes a diaphragm pressure gauge 430, which is connected to the mounting screw hole 214 of the lower shell 210, and the pressure in the exhaust pipe 211 is displayed in real time through the diaphragm pressure gauge 430. Under the suction of the vacuum pump 3, the gas filtered by the oil mist filter 5 in the wind power gearbox will enter the diaphragm pressure gauge 430 along the exhaust pipe 211 and the pressure-inducing hole 213. The diaphragm pressure gauge 430 can accurately reflect the pressure change of the gas in real time, and the current pressure in the wind power gearbox can be known by observing the diaphragm pressure gauge 430. In this embodiment, the display screen and the diaphragm pressure gauge 430 are arranged on the same side of the lower shell 210 to facilitate the staff to patrol and inspect, so that the two different measurement methods of the mechanical measuring instrument and the electronic measuring instrument can be compared, so as to judge whether the measurement value of the pressure sensor 410 is accurate and find problems in time.

[0043] The above-mentioned structural arrangement of the wind turbine gearbox anti-oil leakage intelligent measurement and control device of this embodiment is used. When in use, the air cap or air filter at the exhaust hole of the wind turbine gearbox is removed, and the exhaust hole of the wind turbine gearbox is connected through the connecting stud 111 of the multifunctional preamplifier 1, so as to realize the connection between the wind turbine gearbox anti-oil leakage intelligent measurement and control device of this embodiment and the wind turbine gearbox. When the wind turbine gearbox oil leakage prevention intelligent measurement and control device of this embodiment is powered on, the vacuum pump 3 works to continuously pump air. At this time, the sealing ball 114 floats up under the action of the airflow, and the oil mist gas in the wind turbine gearbox enters the bellows 120 along the air inlet hole 112, enters the vacuum pump 3 from the air extraction pipeline 211 after being filtered by the oil mist filter 5, and enters the air purifier 7 from the exhaust pipeline 212, and is discharged into the atmosphere after being purified by the air purifier 7. During the air extraction process of the vacuum pump 3, the pressure sensor 410 will detect the pressure in the air extraction pipeline 211 (that is, the pressure in the wind turbine gearbox) in real time, and the control mainboard 420 will obtain the pressure detected by the pressure sensor 410 in real time and compare the pressure with the pressure setting value. When the detected pressure is less than the pressure setting value, the control mainboard 420 controls the vacuum pump 3 to stop. At this time, the wind turbine gearbox is in a slightly negative pressure state, and the external environment air reversely leaks into the wind turbine gearbox, causing the shaft oil seal position and the sealing group of the wind turbine gearbox to be damaged. The purpose of air sealing and oil leakage prevention is achieved at the leakage point of the parts, and the gap sealing problem formed by the skeleton oil seal due to wear, aging, mechanical vibration, thermal expansion and contraction is overcome and solved; if the wind power gearbox seal fails and causes reverse pressure relief, the control motherboard 420 will start the vacuum pump 3 to suck again, reciprocating and repeating, always maintaining the negative pressure value of the gearbox air seal; general pressure maintenance control requires the use of switch quantity control to meet the working conditions, and the negative pressure value in the gearbox fluctuates within a certain range; of course, if the on-site technical requirements are high, the control motherboard 420 can also use continuous PID control to control the vacuum pump 3. After setting the control target value, after precise calculation by the single-chip microcomputer, the continuous PID control outputs the analog quantity 4-20mA, adjusts the speed of the vacuum pump 3, and controls the suction flow rate of the vacuum pump 3, so as to achieve the purpose of adjusting the amount to control the internal pressure of the gearbox, so that the internal pressure of the gearbox is always kept constant, avoiding the pressure fluctuation range under the switch quantity control. The above two control methods are both conventional control methods in the automation industry. Regardless of which control method is adopted, the device of the present invention can meet the technical requirements of negative pressure gas seal and oil leakage prevention in wind power gearbox.

[0044] After the device of this embodiment sucks air to the state of the micro-negative pressure setting value for the first time, when the sealing component of the gear box is in a normal sealing state without leakage points, it will always be in a standby intelligent monitoring state; when the seal of the wind turbine gear box fails, the external environment air will reversely leak into the wind turbine gear box. In order to maintain the negative pressure value in the wind turbine gear box, the device of the present invention will not only automatically start and stop the vacuum pump 3 for air extraction intermittently, but also the control motherboard 420 will record the cumulative number of starts of the vacuum pump 3 within 24 hours, the cumulative working time of the vacuum pump 3 within 24 hours and the measured value of the pressure sensor 410, and collect the collected data through 4-20mA analog signal, RS485 digital communication or 4G / 5G digital communication network. The technical data is uploaded to the remote host computer, enterprise smart management platform or mobile terminal device; wind turbines are distributed and installed in multiple terrains, generally in mountains, rivers, lakes and seas. Due to the wide distribution area, complex terrain, inconvenient transportation, climate influence, the need for high-altitude inspection and other conditions, the inspection frequency is definitely not as frequent as that of ground equipment. Wind turbines are in continuous operation, and problems are discovered late, which can easily cause serious accidents. At this time, remote measurement and control technology is particularly important. Operation and maintenance personnel can timely grasp the sealing status of the wind turbine gearbox, judge and analyze the current gearbox seal leakage degree, so as to achieve the purpose of real-time intelligent measurement and control of the equipment sealing components and avoid major operation safety accidents.

[0045] Due to the harsh and complex working environment of wind turbines, the wind turbine cabin is high above the ground and is affected by uncertain factors such as the fluctuating external wind force. The main engine has large vibrations, the cabin space is small, and the temperature difference between day and night is large. The multifunctional preamplifier 1 is connected to the wind turbine gearbox. When the wind turbine gearbox vibrates strongly during operation, the torsional deformation characteristics of the bellows 120 structure absorb the vibration intensity at the lower end to achieve the purpose of stable shaking of the upper end, thereby protecting the main engine of the entire device of this embodiment from mechanical vibrations and ensuring the long-term stable operation of the main components and working circuits inside the main engine.

[0046] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An intelligent measurement and control device for preventing oil leakage in a wind turbine gearbox, used in a wind turbine gearbox, characterized in that: It includes: A multifunctional preamplifier (1) is elastic and is used to be detachably connected to the wind turbine gearbox and its interior is in communication with the interior of the wind turbine gearbox; A vacuum pump (3), the inlet of which is connected to the multifunctional preamplifier (1) and the outlet of which is connected to the outside. Under the suction of the vacuum pump (3), the gas in the wind turbine gearbox enters the multifunctional preamplifier (1) and is filtered by the multifunctional preamplifier (1) and then discharged to the outside through the vacuum pump (3); as well as A pressure detection system (4) is used to detect the pressure in the wind power gearbox and control the start and stop of the vacuum pump (3) according to the pressure.

2. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 1 is characterized in that: The wind turbine gearbox has an exhaust hole; the multifunctional preamplifier (1) comprises an elastic shell and an oil mist filter (5); the elastic shell is formed with a connecting stud (111) for connecting to the exhaust hole; the connecting stud (111) penetrates and is provided with an air inlet hole (112) connecting the elastic shell and the wind turbine gearbox; the oil mist filter (5) is installed in the multifunctional preamplifier (1) and its air outlet is connected to the inlet of the vacuum pump (3).

3. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 2 is characterized in that: A sealing sphere (114) capable of sealing the air inlet hole (112) is arranged in the elastic shell, and the sealing sphere (114) can float under the suction of the vacuum pump (3); And / or, the elastic shell includes a lower end cover (110), a bellows (120) and an upper end cover (130), the two ends of the bellows (120) are respectively connected to the upper end cover (130) and the lower end cover (110), and a connecting stud (111) for connecting to the exhaust hole is formed on the lower end cover (110).

4. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 1 is characterized in that: The wind turbine gearbox anti-leakage oil intelligent measurement and control device also includes a protective housing (2), the vacuum pump (3) is installed in the protective housing (2), and an exhaust pipeline (211) and an exhaust pipeline (212) are formed on the protective housing (2), one end of the exhaust pipeline (211) is connected to the outlet of the oil mist filter (5) and the other end of the exhaust pipeline (211) is connected to the inlet of the vacuum pump (3) through an air intake elastic hose (301), and one end of the exhaust pipeline (212) is connected to the outlet of the vacuum pump (3) through an exhaust elastic hose (302) and the other end of the exhaust pipeline (212) is connected to the outside.

5. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 4 is characterized in that: The wind turbine gearbox oil leakage prevention intelligent measurement and control device further comprises a battery (6), which is installed in the protective housing (2) and is used to supply power to the vacuum pump (3) and the pressure detection system (4); And / or, the wind turbine gearbox anti-leakage oil intelligent measurement and control device further comprises an air purifier (7), the air purifier (7) is mounted on the protective housing (2) and its air inlet is connected to the other end of the exhaust pipe (212).

6. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 4 is characterized in that: The pressure detection system (4) comprises a pressure sensor (410) and a control mainboard (420); the pressure sensor (410) is mounted on the protective housing (2) and is used to detect the pressure in the exhaust pipeline (211); the control mainboard (420) is mounted in the protective housing (2) and is connected to the pressure sensor (410) and the vacuum pump (3); the control mainboard (420) is used to obtain the pressure detected by the pressure sensor (410) and compare the pressure with a pressure setting value: when the pressure is less than the pressure setting value, the control mainboard (420) controls the vacuum pump (3) to stop; when the pressure is greater than or equal to the pressure setting value, the control mainboard (420) controls the vacuum pump (3) to start.

7. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 6 is characterized in that: The pressure detection system (4) further comprises a diaphragm pressure gauge (430), wherein the diaphragm pressure gauge (430) is mounted on the protective housing (2) and an air inlet thereof is connected to the air extraction pipeline (211); And / or, the wind turbine gearbox anti-leakage oil intelligent measurement and control device further comprises a display screen (8) for displaying the pressure and the set value, and the display screen (8) is mounted on the protective housing (2) and connected to the control mainboard (420).

8. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 6 is characterized in that: The control mainboard (420) is connected to a communication antenna (9). The control mainboard (420) is also used to record the cumulative number of starts and the cumulative working time of the vacuum pump (3) within a predetermined time period. The control mainboard (420) calculates the sealing efficiency of the wind turbine gearbox according to the cumulative working time of the vacuum pump within the predetermined time period. or seal failure rate ,in, λ 有效 Represents the sealing efficiency. λ 失效 represents the sealing failure rate, T represents the predetermined time, and N represents the cumulative working time of the vacuum pump (3) within the predetermined time; the control mainboard (420) also compares the calculated sealing effectiveness with a preset alarm value, and when the sealing effectiveness is less than or equal to the alarm value, the control mainboard (420) sends an alarm signal to the outside.

9. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 7 is characterized in that: One end of the protective housing (2) close to the multifunctional preamplifier (1) is machined to form a pressure inlet hole (213) connected to the exhaust pipe (211), and the pressure sensor (410) is cooperatively connected to the end of the pressure inlet hole (213) away from the exhaust pipe (211); the outer wall of one end of the protective housing (2) close to the multifunctional preamplifier (1) is machined to form a mounting screw hole (214) connected to the pressure inlet hole (213) and used for mounting a diaphragm pressure gauge (430).

10. The wind turbine gearbox oil leakage prevention intelligent measurement and control device according to claim 4, characterized in that: The protective housing (2) comprises a lower housing (210), an upper housing (220) and a cover (230); a connecting screw hole communicating with the interior of the multifunctional preamplifier (1) is provided on the lower housing (210); one end of the lower housing (210) is open and the other end thereof is formed with a second connecting stud (215), the second connecting stud (215) being threadedly connected to the connecting screw hole; an end of the lower housing (210) close to the multifunctional preamplifier (1) is formed with two through holes extending from its inner bottom surface to the outside through machining, the two through holes serving as exhaust pipes (211) respectively. , an exhaust pipe (212), an exhaust pipe (211) passes through the second connecting stud (215) and is connected to the inside of the multifunctional preamplifier (1), and a section of the exhaust pipe (211) located inside the second connecting stud (215) is provided with an internal thread; both ends of the upper shell (220) are open and are respectively threadedly connected to the open end of the lower shell (210) and the sealing cover (230); the vacuum pump (3) is installed in the lower shell (210), and the air outlet end of the oil mist filter (5) is threadedly connected to the internal thread section of the exhaust pipe (211).

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