Self-powered oil detection sensor with magnetic attraction alarm function

Abstract

The application discloses a self-powered oil detection sensor with magnetic attraction alarm function, which comprises a micro power generation device, i.e., a rotating ring with internal helical teeth is used to contact with oil, the energy of oil flow is used to drive the rotating ring to rotate to generate electromagnetic induction to generate electricity, so that the oil detection sensor has a self-powered function; the internal helical teeth embedded with magnets are used to make the oil detection sensor have a magnetic attraction function; and a conductive layer is arranged on the tooth surface of the internal helical teeth, when a certain amount of metal particles are adsorbed, the conductive loop is formed to output an alarm, so that the oil detection sensor has a performance self-diagnosis function. The oil detection sensor is small in structure, stable and reliable.

Description

TECHNICAL FIELD

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

[0002] An aero-engine provides power required for flight of an airplane, and is a heart of the airplane. Health of the aero-engine directly affects performance, reliability and safety of the airplane. Since the aero-engine works in a harsh condition, it is important to monitor structural health of the aero-engine in service, and is one of the necessary technologies for future advanced aero-engines. At present, a detection sensor is connected in series to an oil circuit of the aero-engine, and a wired power supply is used for power supply. However, with the development of technology, the wired power supply gradually cannot meet the technical upgrading of the monitoring system, and a wireless power supply method becomes one of the technical routes for system upgrading. The existing self-powered methods are various in structure and are difficult to be applied to health monitoring of the aero-engine due to poor matching with the aero-engine. Therefore, the present application studies a self-powered oil detection sensor with magnetic attraction alarm function. SUMMARY

[0003] In order to solve the problems of the traditional wired power supply and the existing self-powered device in structure and matching, the present application provides a self-powered oil detection sensor with magnetic attraction alarm function. The present application is implemented as follows.

[0004] The self-powered oil detection sensor with magnetic attraction alarm function comprises a shell, a coil framework, a power generation coil, a detection coil and a rotating ring. The shell is internally provided with the power generation coil. The rotating ring is rotationally arranged in the middle of the power generation coil. The inner side wall of the rotating ring is provided with internal helical teeth. The internal helical teeth are embedded with magnets. The rotating ring is in contact with oil and is driven by the oil to rotate the internal helical teeth to generate electromagnetic induction for power generation to supply the oil detection sensor.

[0005] The rotating ring is made of a non-magnetic material. A plane rectangular coordinate system is made with the center of the rotating ring as the origin. The magnets are embedded only in a group of internal helical teeth which are symmetric to each other in the quadrant. The outer side of the power generation coil is further provided with the detection coil. The detection coil is used for detecting metal particles in the oil.

[0006] Further, the tooth surface of the internal helical teeth embedded with the magnets is provided with a conductive layer. Adjacent two internal helical teeth can adsorb metal particles. When the metal particles adsorbed between the adjacent two internal helical teeth reach a certain amount, the metal particles form a conductive loop with the conductive layers on the tooth surfaces on both sides to feedback and alarm.

[0007] Further, the side of the rotating ring is provided with a fixed ring switch, when the rotating ring rotates, a pair of inner inclined teeth of the conductive layer that are in contact with each other pass through the fixed ring switch, and the fixed ring switch is triggered to complete a switch; when the rotating ring rotates one circle, if multiple teeth of the rotating ring are in contact, multiple switches are triggered.

[0008] As a further improvement, the two ends of the power generation coil are provided with connection terminals, 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 use by the oil detection sensor.

[0009] As a further improvement, the power generation coil is a solenoid ring, the direction of the magnetic lines of force is parallel to the circumference of the oil pipe; the winding direction of the detection coil is parallel to the circumference of the oil pipe; the filter separates the frequency of the power generation coil and the detection coil.

[0010] As a further improvement, the coil skeleton is provided with the power generation coil and the detection coil, the rotating ring is arranged on the inner side of the coil skeleton, and the rotating ring and the coil skeleton are further provided with a ball.

[0011] As a further improvement, the conductive layer is a metal conductive film or a conductive coating.

[0012] Compared with the prior art, the present application can obtain the following technical effects:

[0013] Firstly, the micro power generation device is designed, that is, a rotating ring with inner inclined teeth is contacted with oil, and a power generation coil is arranged on the outer periphery of the rotating ring, electromagnetic induction is generated by the sliding oil flow rate to drive the rotating ring to rotate to generate electricity for the oil detection sensor; the design of the inner inclined teeth is easy to push, the inclined tooth surface makes the rotation transmission more smooth, the structural length of the rotating ring is reduced, and the requirements of the aircraft for the monitoring equipment to be miniaturized, stable and reliable are met.

[0014] Secondly, the rotating ring is made of non-magnetic material, and a magnet is arranged on the inner inclined teeth of the corresponding area to form upper and lower magnetic poles for power generation; further, a detection coil is arranged outside the power generation coil, and the inner inclined teeth without the magnet are used to detect metal particles in the oil pipe, so that the integration and small size of the sensor are realized.

[0015] Third, this invention embeds magnets on the inner helical teeth in the corresponding area, allowing metal particles to be attracted between two adjacent inner helical teeth. This provides a good magnetic attraction effect, preventing metal particles from flowing back into the engine and affecting its safety performance. Furthermore, a conductive layer is provided on the tooth surface of the inner helical teeth with embedded magnets. When the amount of metal particles attracted between two adjacent inner helical teeth reaches a certain level, the metal particles and the conductive layer on both sides of the tooth surface form a conductive circuit to provide feedback alarm, prompting the sensor to clean the metal particles and preventing the rotation of the rotating ring from being obstructed and affecting the power supply. This achieves the self-diagnostic function of the sensor performance. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the present invention connected in series in the oil circuit.

[0018] Figure 2 for Figure 1 A cross-sectional schematic diagram.

[0019] Figure 3 This is a schematic diagram of the detection coil, power generation coil, and rotating ring of the present invention.

[0020] Figure 4 This is a schematic diagram of the rotating ring of the present invention.

[0021] Figure 5 for Figure 3 A schematic diagram viewed from above.

[0022] Figure 6 for Figure 3 The structure explodes.

[0023] Figure 7 for Figure 6 Enlarged schematic diagram of region G in the middle.

[0024] In the picture:

[0025] 10-Oil circuit;

[0026] 20-Oil detection sensor, 21-Housing, 22-Coil frame, 23-Detection coil, 24-Generation coil, 25-Rotating ring, 251-Internal helical teeth, 252-Magnet, 253-Conductive layer, 26-Roller, 27-Fixed ring switch, 271-Reed contact. Detailed Implementation

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0028] In the description of the present application, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features.

[0029] Collecting the energy generated during the operation of the device and converting it into electrical energy to realize self-power supply of the monitoring system is one of the current research hotspots. The existing self-power supply modes include converting vibration energy into electrical energy and using high-temperature thermocouples to realize self-power supply, but there are disadvantages such as insufficient energy or too small temperature difference leading to unstable power supply. Based on this, the present application proposes a new self-power supply idea, aiming to realize self-sufficiency of the electrical energy of the system, and can simultaneously detect and adsorb the ferromagnetic impurities in the oil, and when the adsorbed ferromagnetic impurities reach a certain amount, the sensor can also alarm, realizing self-diagnosis of the performance of the self-powered sensor, ensuring stable and reliable power supply.

[0030] Reference is made to the drawings Figures 1-7 The present application discloses a self-powered oil detection sensor with magnetic attraction alarm function, which is used for online monitoring of the health of the oil of an aero-engine, is connected in series on the oil circuit 10 of the aircraft engine, and comprises a shell 21, a power generation coil 24 is arranged in the shell 21, a rotating ring 25 is rotatably arranged in the middle of the power generation coil 24, the rotating ring 25 is in contact with the oil and is pushed to rotate by the oil, an inner bevel gear 251 is arranged on the inner side wall of the rotating ring 25, and a magnet 252 is embedded on the inner bevel gear 251. When the rotating ring 25 rotates, electromagnetic induction is generated to generate electricity for the oil detection sensor 20. In the embodiment, the shell 21 is square in shape, and in other embodiments, a cylindrical shell 21 is preferably adopted to reduce the influence of vibration. In combination with the characteristics of the oil, a miniature power generation device is designed to be connected in series on the engine lubricating oil pipe, the flow rate of the oil is used to push the inner bevel gear to rotate, and the power generation coil is used to form an induced current for the detection sensor, the energy of the oil flow is converted into electrical energy, and the resource recycling rate is improved. The design of the inner bevel gear is easy to push, the bevel gear surface makes the rotation transmission more smooth, thereby shortening the structural length of the rotating ring, making the overall power generation structure more miniaturized, and the structure is simple, stable and reliable, and is also more convenient to install and fix.

[0031] Further, the present application integrates the design of the detection function of metal particles in oil, the self-power generation function of the device, the adsorption function of metal particles, and the alarm function after the adsorption of metal particles. The specific design is as follows: the outer side of the power generation coil 24 is further provided with a detection coil 23, the rotating ring 25 is made of a non-magnetic material, as shown in the attached Figure 4 figure, taking the center of the rotating ring 25 as the origin of a plane rectangular coordinate system, the magnet 252 is only embedded on a set of mutually symmetrical inner helical teeth in the corresponding quadrant, and the detection coil 23 is used to detect metal particles in the oil. If the rotating ring is used as the rotor in the traditional power generation system, the rotating ring will cause magnetic shielding for detection. In order to integrate the detection function, the power generation function and the detection function need to be designed side by side, and the overall structure of the sensor will be lengthened, which cannot meet the miniaturization requirement. In the present application, the rotating ring is made of a non-magnetic material, which avoids the problem of magnetic shielding caused by the rotating ring, and only the magnet 152 is arranged on the inner helical teeth 251 in the corresponding area to form the upper and lower magnetic poles for power generation. Further, the detection coil 23 is arranged outside the power generation coil 24 to detect metal particles in the oil through the inner helical teeth part without the magnet 252, realizing the integration and small size of the overall sensor.

[0032] Further, the rotating ring 25 can rotate to generate power as a power source, and the inner helical teeth with the magnet 252 have a magnetic attraction function to collect metal particles in the oil. The metal particles can be adsorbed between the two adjacent inner helical teeth 251 to prevent the metal particles from flowing back into the engine and affecting the safety performance of the engine. At the same time, the conductive layer 253 is arranged on the tooth surface of the inner helical teeth 251 with the magnet 252. Preferably, the conductive layer 253 is a metal conductive film or a conductive coating. When the metal particles adsorbed between the two adjacent inner helical teeth 251 reach a certain amount, the metal particles and the conductive layer 253 on the tooth surface on both sides form a conductive loop for feedback alarm, prompting the sensor to clean the metal particles to prevent the rotation of the rotating ring from being blocked and affecting the power supply, realizing the self-diagnosis of the performance of the sensor.

[0033] Further, referring to the attached Figures 6-7The side of the rotating ring 25 is provided with a fixed ring switch 27, which is annular, fixed on the coil framework and in contact with the rotating ring 25. The fixed ring switch 27 is provided with a pair of symmetrical reed contacts 271, and other structural forms of contacts can also be used in other embodiments. The distance between the two reed contacts 271 is equal to the distance between the teeth of the inner helical teeth 251. When the rotating ring 25 rotates, the two reed contacts 271 are in contact with the tooth surface of each inner helical tooth 251. When the conductive layer 253 on the tooth surface with metal particles is in contact with each other, the pair of inner helical teeth 251 in contact with each other passes through the fixed ring switch, and the reed contacts 271 are in contact, triggering the fixed ring switch to complete a switch. The switch signal is transmitted to the monitoring instrument by the lead. When the rotating ring 25 rotates one circle, if multiple teeth are in contact, the inner helical teeth 251 in contact pass through the fixed ring switch 27 in turn, and the reed contacts 271 are connected multiple times, triggering multiple switches. According to the number of switches of the fixed ring switch 27, the adsorption amount of the adsorbed metal particles is evaluated. Compared with the existing magnetic attraction alarm structure, more adsorption amount levels can be evaluated, and the evaluation accuracy is higher.

[0034] As a further improvement, the self-powered detection sensor is also provided with a rectifier, a filter and an energy storage device (not shown). The ends of the power generation coil 24 are provided with wire terminals, which are connected to the rectifier and filter circuit in turn. The current after rectification and filtering is stored in the energy storage device for use by the oil detection sensor. Because the rotating ring rotates at a flow speed of the oil, the rotating speed of the rotating ring cannot be constant and may be affected by equipment vibration to form a poor current stability. The generated current is alternating current, which needs to be rectified. In this embodiment, the current is led out through the wire terminals, connected to the rectifier and filter in turn, and forms direct current after rectification and filtering, which is relatively stable. In this embodiment, the generated current is stored in the energy storage device, and then supplied to the detection sensor. The entire power supply device has compact structure and high firmness, and is easy to process and install.

[0035] As a further improvement, the power generation coil 24 is a solenoid ring. In this embodiment, the power generation coil 24 is formed by a group of solenoid rings, and in other embodiments, it can also be formed by several groups of solenoid tubes. The winding direction of the detection coil 23 is parallel to the circumference of the oil pipe, and the detection coil 23 is wrapped outside the power generation coil 24. The filter separates the frequency of the power generation coil and the detection coil. The power generation coil uses low frequency, and the detection coil uses high frequency, and the frequency separation solves the problem of signal interference.

[0036] As further improvement, the shell 21 is provided with a coil skeleton 22, and the power generation coil 23 and the detection coil 23 are wound on the coil skeleton 22. The coil skeleton 22 protects the coils from mutual abrasion or mutual interference during the operation of the device. The rotating ring 25 is rotatably arranged on the inner side of the coil skeleton 21, and the rotating ring 25 and the coil skeleton 21 are further provided with balls or rollers 26. The rotating ring 25 and the coil skeleton 21 are respectively provided with corresponding ball grooves or roller grooves on the mutually adhering surfaces, and the balls or rollers 26 have a speed increasing effect to assist the rotation of the rotating ring, thereby improving the power generation efficiency.

[0037] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-powered oil detection sensor with magnetic attraction alarm function, which is connected in series in the oil circuit of an aircraft engine, characterized in that, The utility model provides a kind of oil detection sensor, including shell, coil former, generating coil, detection coil and rotating ring, the shell is provided with generating coil inside, the middle rotation of the generating coil is provided with rotating ring, the inner side wall of the rotating ring is provided with inner bevel gear, the inner bevel gear is embedded with magnet, the rotating ring is contacted with oil and is driven by oil to rotate inner bevel gear to generate electromagnetic induction and generate electricity for oil detection sensor; Wherein, the rotating ring is made of non-magnetic material, with the center of the rotating ring as origin to make a plane rectangular coordinate system, the magnet is only embedded in a set of inner bevel gears which are symmetric in the quadrant, the outer side of the generating coil is further provided with detection coil, the detection coil detects metal particles in oil pipe through the part of inner bevel gear without magnet; The tooth surface of the inner bevel gear embedded with magnet is provided with conductive layer, adjacent two inner bevel gears adsorb metal particles, when the metal particles adsorbed between adjacent two inner bevel gears reach a certain amount, the metal particles form conductive loop with conductive layer on the tooth surface of both sides and output alarm.

2. The self-powered oil detection sensor with magnetic attraction alarm function according to claim 1, characterized in that, The side of the rotating ring is provided with fixed ring switch, when the rotating ring rotates, a pair of inner bevel gears with conductive layer mutual conduction pass through fixed ring switch, trigger fixed ring switch to complete once switch, when the rotating ring rotates a circle, if multiple teeth on the rotating ring are conducted, trigger multiple switches.

3. The self-powered oil detection sensor with magnetic attraction alarm function according to claim 1, characterized in that, The two ends of the generating coil are provided with terminal, and are connected with rectifier and filter circuit in sequence, the current after rectification and filtering is stored in energy storage device for oil detection sensor.

4. The self-powered oil detection sensor with magnetic attraction alarm function according to claim 3, characterized in that, The generating coil is solenoid ring, the winding direction of the detection coil is parallel with the circumferential direction of the oil pipe, the filter separates the frequency of the generating coil and the detection coil.

5. The self-powered oil detection sensor with magnetic attraction alarm function according to claim 1, characterized in that, The coil former is provided with generating coil and detection coil, the rotating ring is rotationally arranged on the inner side of the coil former, and the rotating ring and the coil former are further provided with ball.

6. The self-powered oil detection sensor with magnetic attraction alarm function according to claim 1, characterized in that, The conductive layer is metal conductive film or conductive coating.

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