A self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function

Abstract

This invention discloses a self-powered oil detection sensor with magnetic attraction effect evaluation and alarm functions. It includes a housing, a miniature power generation component, and a detection component. The miniature power generation component includes a magnetic ring with internal helical teeth and a power generation coil. The magnetic ring contacts the oil, and the energy of the flowing oil drives the magnetic ring to rotate, cooperating with the power generation coil to generate electromagnetic induction and produce electricity, thus enabling the oil detection sensor to be self-powered. The magnetic ring has a magnetic attraction function. Setting a first coil winding and a second coil winding allows for absolute detection, or differential detection by connecting the two coil windings differentially. Analyzing the detection signal allows for the evaluation of the sensor's magnetic attraction effect. By setting a conductive layer on the surface of the internal helical teeth, a conductive circuit can be formed when a certain amount of metal particles are attracted, and an alarm output can be generated, enabling the oil detection sensor to have a performance self-diagnosis function. This invention has multiple practical functions, and the sensor structure is compact, stable, and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of self-powered sensor of monitoring system, and particularly relates to a self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function. BACKGROUND

[0002] An aero-engine is the heart of an airplane and is known as an "industrial flower". The structural health of the aero-engine directly affects the performance, reliability and safety of the airplane. Since the aero-engine is in a high-temperature, high-speed and heavy-load application environment for a long time, the bearing surface of the aero-engine is prone to wear and failure, and the wear particles falling off will also enter the oil system and affect the operation of the aero-engine. The existing oil metal wear particle detection sensor is used to detect and analyze the ferromagnetic metal wear particles in the oil to determine the structural health of the aero-engine. The metal wear particle detection sensor and the metal wear particle capture sensor are separate and use wired power supply, and the effect of capturing the metal wear particles cannot be evaluated. The structure is complex and has poor stability. With the development of technology, wireless power supply has become one of the technical routes for system upgrading, and small-sized and highly integrated sensor structure is an important direction of research and development. Based on the existing technology, the present application researches a self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function. SUMMARY

[0003] To achieve the above purpose, the present application provides a self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function, which is implemented as follows.

[0004] The self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function is connected in series on an oil circuit of an aero-engine and comprises a micro power generation assembly and a detection assembly. The micro power generation assembly comprises a magnetic ring in contact with oil. An outer periphery of the magnetic ring is provided with a power generation coil. An inner side wall of the magnetic ring is provided with internal inclined teeth. The oil drives the magnetic ring to rotate and cooperate with the power generation coil to generate an electric induction for power generation to supply the oil detection sensor. Meanwhile, the internal inclined teeth of the magnetic ring can attract metal particles in the oil.

[0005] The detection assembly comprises first and second coil windings. The first and second coil windings are arranged at two ends of the micro power generation assembly, respectively. The first and second coil windings can work in an absolute mode or a differential mode.

[0006] The absolute operation is as follows: the first coil winding and the second coil winding work separately and independently. When the oil passes through the first coil winding, it obtains a first detection signal, and then flows through the magnetic ring of the micro-generator component. When it passes through the second coil winding, it obtains a second detection signal. By comparing the difference between the first detection signal and the second detection signal, it can be determined whether the metal particles in the oil are attracted when they flow through the magnetic ring, thereby evaluating the magnetic attraction effect of the oil detection sensor.

[0007] The differential operation is as follows: the first coil winding and the second coil winding are differentially connected and work simultaneously. When the oil flows through the first coil winding, then through the magnetic ring of the micro-generator component, and then through the second coil winding, a detection signal is obtained. By analyzing the characteristics of the detection signal curve, it can be determined whether the metal particles in the oil are attracted when they flow through the magnetic ring, thereby evaluating the magnetic attraction effect of the oil detection sensor.

[0008] Furthermore, a conductive layer is provided on the tooth surface of the internal helical teeth. When the amount of metal particles adsorbed between two adjacent internal helical teeth reaches a certain amount, the metal particles and the conductive layer on both sides of the tooth surface form a conductive circuit and output an alarm signal.

[0009] Furthermore, a fixed-ring switch is provided on the side of the magnetic ring. When the magnetic ring rotates, a pair of internal helical teeth that are interconnected in the conductive layer pass through the fixed-ring switch, triggering the fixed-ring switch to complete one switch. When the magnetic ring rotates one revolution, if multiple teeth on the magnetic ring are interconnected, multiple switches are triggered.

[0010] As a further improvement, the two ends of the power generation coil are provided with terminals, which are connected in sequence to the rectifier and filter circuits. The current after rectification and filtering is stored in the energy storage device for use by the oil detection sensor.

[0011] As a further improvement, the first detection signal, the second detection signal obtained by absolute operation, or the detection signal obtained by differential operation includes information that can distinguish between ferromagnetic and non-ferromagnetic metal particles, information on the number of metal particles, information on the size of metal particles, and information on equivalent mass or volume.

[0012] As a further improvement, the conductive layer is a metal conductive thin film or a conductive coating.

[0013] Compared with existing technologies, this application can achieve the following technical effects:

[0014] I. This invention includes a miniature power generation component, which employs a power generation coil and a magnetic ring with internal helical teeth arranged inside the power generation coil. The magnetic ring is in contact with oil, and the oil flow velocity drives the magnetic ring to rotate, generating electromagnetic induction to generate electricity for use by the oil detection sensor. The design of the internal helical teeth makes it easy to drive, and the helical tooth surface makes the rotation transmission smoother, reducing the structural length of the magnetic ring and meeting the requirements of aircraft for miniaturization, stability, and reliability of the onboard monitoring equipment.

[0015] Second, this invention sets up a magnetic ring and sets internal helical teeth on the inner side wall of the magnetic ring. The internal helical teeth have more adsorption surface for adsorbing metal particles, resulting in stronger adsorption. Furthermore, the magnetic ring is in a rotating state under the push of the oil, realizing dynamic adsorption and preventing metal particles from flowing back into the engine, thereby affecting engine operation.

[0016] Third, this invention employs a first coil winding and a second coil winding, respectively, at both ends of a micro-power generation component. The first and second coil windings can be used for absolute detection separately, and the magnetic attraction effect of the sensor can be evaluated by comparing the two signals. Alternatively, the first and second coil windings can be differentially connected and operate simultaneously to acquire a set of detection signals. By analyzing the characteristics of the detection signal curve, it can be determined whether metal particles in the oil are attracted when flowing past the magnetic ring, thus evaluating the magnetic attraction effect of the sensor. The detection method can be flexibly selected according to the detection needs, improving the detection accuracy.

[0017] Fourth, this invention coats a conductive layer on the tooth surface of the internal helical teeth. When the amount of metal particles adsorbed at the included angle between two adjacent internal helical teeth reaches a certain amount, the metal particles and the conductive layers on both sides form a conductive circuit to output an alarm signal, thus realizing the self-diagnosis function of the sensor performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the present invention or the prior art, or to provide a simple description of the drawings used in the prior art, it is obvious that those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the external structure of the present invention.

[0020] Figure 2 for Figure 1 A structural diagram from another perspective.

[0021] Figure 3 for Figure 1 The structure explodes.

[0022] Figure 4 for Figure 1 A schematic diagram of the structure viewed from the left.

[0023] Figure 5 for Figure 4 A schematic diagram of the cross-section along line AA.

[0024] Figure 6 This is a schematic diagram of the structure of the micro power generation component and the detection component of the present invention.

[0025] Figure 7 for Figure 6 The structure explodes.

[0026] Figure 8 for Figure 7 An enlarged schematic diagram of region A in the middle.

[0027] Figure 9 This is a schematic diagram of the magnetic ring with internal helical teeth in this invention.

[0028] In the picture:

[0029] 10-Oil circuit;

[0030] 20 - Shell;

[0031] 30-Miniature power generation component, 31-Magnetic ring, 311-Internal helical teeth, 312-Conductive layer, 32-Power generation coil, 33-Coil frame, 34-Roller, 35-Fixed ring switch, 351-Reed contact, 352-Lead wire;

[0032] 40 - Detection component; 41 - First coil winding; 42 - Second coil winding;

[0033] 50-Metal particles. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0035] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0036] Engine bearings generate a large number of metal particles due to wear, which enter the lubricating oil. To monitor the health of the engine's lubrication system, existing methods involve connecting a monitor in series with the return oil line. When metal particles flow past the monitor, the system captures the signal, processes it, and saves, statistically analyzes, or outputs an alarm. Conventional monitors require an external wired power supply, but the excessive number of external devices on aircraft creates additional safety risks. To simplify the monitoring device's structure, wireless power has become one of the technical routes for system upgrades. Simultaneously, the requirements for metal particle monitoring are becoming increasingly stringent. Therefore, this invention studies a self-powered oil detection sensor with magnetic attraction effect evaluation and alarm functions.

[0037] This invention aims to: 1. Utilize the properties of oil to form a self-powered system for the sensor, simplifying external equipment and redundant wiring; 2. Improve the accuracy of detection results. By rationally arranging the structural positions of the first and second coil windings, absolute or differential detection can be used, flexibly selecting the detection method according to the detection needs; 3. Utilize existing structures to achieve structural multifunctionality. The magnetic ring in the existing power generation structure is used to capture metal particles in the oil; the magnetic attraction effect of the magnetic ring is evaluated using a metal particle detection component; a magnetic attraction alarm function is formed by coating a conductive layer on the inner helical tooth surface of the magnetic ring, performing self-diagnosis of the power generation structure performance and simultaneously prompting for cleaning of metal particles. Compared with existing technologies, this invention achieves sensor miniaturization, improves safety and reliability, makes installation more convenient, and provides comprehensive detection performance. The specific structure is as follows:

[0038] Reference Appendix Figures 1-9As shown, a self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function is connected in series on the oil circuit 10 of an aircraft engine. It includes a housing 20, a micro generator 30 and a detection component 40. The middle part of the housing 20 is hollow for communication with the oil circuit 10. The micro generator 30 and the detection component 40 are disposed inside the housing 20. In this embodiment, the housing 20 is square in shape. In other embodiments, a cylindrical housing 20 is preferred to reduce the impact of vibration. The micro-power generation component 30 includes a coil frame 33, the main body of which is ring-shaped and adapted to the housing 20. A magnetic ring 31 is rotatably disposed in the middle of the coil frame 33, and the magnetic ring 31 is in contact with the oil. The inner wall of the magnetic ring 31 has internal helical teeth 311. A power generation coil 32 is wound around the coil frame 33 (i.e., the power generation coil 32 is sleeved on the outer periphery of the magnetic ring 31). The power generation coil 32 is a solenoid, which can be a complete solenoid or multiple solenoid coils assembled into a ring. The oil drives the magnetic ring 31 to rotate, and the magnetic ring 31 and the power generation coil 32 cooperate to generate electricity through induction for use by the oil detection sensor. A ball or roller 34 is also provided between the coil frame 33 and the magnetic ring 31 to assist the rotation of the magnetic ring 31 and improve the power generation efficiency.

[0039] The system utilizes the flow rate of the oil to drive the magnetic ring's rotation, converting the existing energy within the equipment into electrical energy, thus improving resource recycling efficiency. Simultaneously, it achieves compatibility between the self-powered component and the original airborne equipment, reducing interference from external detection equipment. The design employs internal helical teeth (311), facilitating easy propulsion. The helical tooth surface ensures smoother rotational transmission, significantly shortening the rotor's structural length and resulting in a more compact overall self-powered structure. This facilitates installation and ensures stability and reliability, reducing the aircraft's load.

[0040] Furthermore, the magnetic ring 31 uses a permanent magnet, and the internal helical teeth 311 on the magnetic ring 31 have multiple adsorption surfaces, resulting in stronger adsorption of metal particles 50. The magnetic ring 31 rotates under the drive of the oil, achieving dynamic adsorption and preventing metal particles 50 from flowing back into the engine and affecting engine operation.

[0041] For further details, please see the appendix. Figure 6 Appendix Figure 7The detection component 40 includes a first coil winding 41 and a second coil winding 42, which are respectively disposed at both ends of the micro-power generation component 30. Specifically, the first coil winding 41 and the second coil winding 42 can share a coil frame with the power generation coil 32, or they can have independent coil frames. In this embodiment, they share a coil frame 33, and the first coil winding 41 and the second coil winding 42 are respectively disposed at both ends of the power generation coil 32. The first coil winding 41 and the second coil winding 42 can operate in absolute or differential mode.

[0042] The absolute operation is as follows: the first coil winding 41 and the second coil winding 42 work separately and independently. When the oil passes through the first coil winding 41, it obtains a first detection signal, and then flows through the magnetic ring 31 of the micro-power generation component 30. When it passes through the second coil winding 41, it obtains a second detection signal. By comparing the difference between the first detection signal and the second detection signal, it can be determined whether the metal particles 50 in the oil are attracted when they flow through the magnetic ring 31, thereby evaluating the magnetic attraction effect of the oil detection sensor.

[0043] The differential operation is as follows: the first coil winding 41 and the second coil winding 42 are differentially connected and operate simultaneously. When the oil flows through the first coil winding 41, then through the magnetic ring 31 of the micro-generator component 30, and then through the second coil winding 42, a detection signal is obtained. By analyzing the characteristics of the detection signal curve, it can be determined whether the metal particles 50 in the oil are adsorbed when they flow through the magnetic ring 31, thereby evaluating the magnetic attraction effect of the oil detection sensor.

[0044] The first and second detection signals acquired by absolute detection, or the detection signals acquired by differential detection, contain information that can distinguish between ferromagnetic and non-ferromagnetic metal particles, as well as information on the number, size, and equivalent mass or volume of metal particles. The characteristic signals generated when metal particles within a certain size range pass through the detection oil circuit are transmitted via a matching signal transmission cable and processed and analyzed by a comprehensive diagnostic instrument to obtain important parameters such as the nature, quantity, and size of the metal particles, thereby improving detection accuracy.

[0045] By evaluating the magnetic attraction effect of the sensor, the structural health of the generator can be further diagnosed and monitored by assessing the metal particle content in the oil after the initial capture of metal particles.

[0046] For further improvement, please refer to the appendix. Figure 9 A conductive layer 312 is provided on the tooth surface of the internal helical tooth 311 (attached). Figure 9(Not fully shown, but each internal helical tooth 311 has a conductive layer 312 on its tooth surface. The conductive layer 312 is a metal conductive film or conductive coating. The thinness of the metal conductive film or conductive coating minimizes its impact on the tooth structure and provides good stability. When a certain amount of metal particles 50 are adsorbed between two adjacent internal helical teeth 311, the metal particles 50 form a conductive circuit with the conductive layer 312 on both sides of the tooth surface and output an alarm signal. The alarm function prompts the sensor to clean the metal particles 50 when the gaps between the internal helical teeth are filled with them, preventing excessive metal particles 50 adsorbed on the magnetic ring 31 from obstructing rotation and affecting power supply. The alarm function enables self-diagnosis of the sensor's self-powered performance.)

[0047] Further, see attached document. Figure 8 As shown, a fixed-ring switch 35 is attached to the side of the magnetic ring 31. The fixed-ring switch 35 is ring-shaped, fixed on the coil frame, and attached to the magnetic ring 31. The fixed-ring switch is provided with a pair of symmetrical spring contacts 351. In other embodiments, contacts with other structural methods can also be used. The distance between the two reed contacts 351 is equal to the tooth spacing of the inner helical teeth 311. When the magnetic ring 31 rotates, the two reed contacts 351 contact the tooth surfaces of each inner helical tooth 311. When the conductive layer 312 on the tooth surface with adsorbed metal particles is interconnected, the pair of interconnected inner helical teeth 311 pass through the fixed-loop switch and connect with the reed contacts 351, triggering the fixed-loop switch to complete one switching operation. The switching signal is then transmitted to the monitoring instrument via the lead wire 352. When the magnetic ring 31 rotates one revolution, if multiple teeth on the magnetic ring 31 are interconnected, the interconnected inner helical teeth 311 pass through the fixed-loop switch in sequence, thus connecting the reed contacts 351 multiple times and triggering multiple switching operations. The adsorption level of the adsorbed metal particles is evaluated based on the number of switching operations of the fixed-loop switch 35. Compared with existing magnetic alarm structures, more adsorption levels can be evaluated, and the evaluation accuracy is higher.

[0048] As a further improvement, the two ends of the generator coil 32 are provided with terminals, which are connected in sequence to a rectifier and a filter (not shown) circuit. The current after rectification and filtering is stored in the energy storage device for use by the oil detection sensor. The AC power generated is converted into DC power by the rectifier and filter, stored in the energy storage device, and then supplied to other components. This avoids the problem of poor current stability that may be caused by factors such as equipment vibration, and achieves stable power supply.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function, which is connected in series in the oil circuit of an aircraft engine, characterized in that, The application relates to an oil liquid detection sensor, which comprises a micro power generation assembly and a detection assembly, wherein the micro power generation assembly comprises a magnetic ring in contact with oil liquid, an outer periphery of the magnetic ring is provided with a power generation coil, and an inner side wall of the magnetic ring is provided with inner inclined teeth; the oil liquid drives the magnetic ring to rotate and cooperate with the power generation coil to generate electric induction and generate power for the oil liquid detection sensor, and the inner inclined teeth of the magnetic ring adsorb metal particles in the oil liquid. ​ The detection assembly comprises a first coil winding and a second coil winding, the first coil winding and the second coil winding are arranged at two ends of the micro power generation assembly respectively, and the first coil winding and the second coil winding perform absolute working or differential working. The absolute working is that the first coil winding and the second coil winding are independently worked separately, the oil liquid obtains a first detection signal when passing through the first coil winding, then flows through the magnetic ring of the micro power generation assembly, and obtains a second detection signal when passing through the second coil winding; by comparing the difference between the first detection signal and the second detection signal, whether the metal particles in the oil liquid are adsorbed when flowing through the magnetic ring is judged, so as to evaluate the magnetic adsorption effect of the oil liquid detection sensor. The differential working is that the first coil winding and the second coil winding are differentially connected and simultaneously worked, the oil liquid obtains a detection signal when passing through the first coil winding, then flowing through the magnetic ring of the micro power generation assembly and passing through the second coil winding; by analyzing the curve characteristics of the detection signal, whether the metal particles in the oil liquid are adsorbed when flowing through the magnetic ring is judged, so as to evaluate the magnetic adsorption effect of the oil liquid detection sensor. An electrically-conductive layer is arranged on the tooth surface of the inner inclined teeth, when the metal particles adsorbed between two adjacent inner inclined teeth reach a certain amount, the metal particles form an electrically-conductive loop with the electrically-conductive layers on the tooth surfaces on both sides and output an alarm signal.

2. The self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function according to claim 1, characterized in that, A fixed ring switch is arranged on the side of the magnetic ring, when a pair of inner inclined teeth, which are in electrically-conductive connection with each other, pass through the fixed ring switch when the magnetic ring rotates, the fixed ring switch is triggered to complete one switching; when the magnetic ring rotates one circle, if multiple teeth are in electrically-conductive connection, the fixed ring switch is triggered multiple times.

3. The self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function according to claim 1, characterized in that, Wire terminals are arranged at two ends of the power generation coil and are sequentially connected with a rectifier and a filter circuit, and the current after rectification and filtering is stored in an energy storage device for the oil liquid detection sensor.

4. The self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function according to claim 1, characterized in that, The first detection signal and the second detection signal obtained by the absolute working or the detection signal obtained by the differential working contains information capable of distinguishing ferromagnetic metal particles and non-ferromagnetic metal particles, metal particle quantity information, metal particle size information, equivalent mass or volume information.

5. The self-powered oil detection sensor with magnetic attraction effect evaluation and alarm function according to claim 1, characterized in that, The electrically-conductive layer is a metal electrically-conductive film or an electrically-conductive coating.

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