Magnetic attraction sensor for ferromagnetic particles in lubricating oil of aero-engine

Abstract

The invention relates to the technical field of engine lubricating oil ferromagnetic particle electromagnetic monitoring, and discloses an aero-engine lubricating oil ferromagnetic particle magnetic sensor, which is characterized in that a double-shell structure magnetic sensor is designed and is connected in series on an oil return pipe section of an engine lubricating oil system, a U-shaped magnet is packaged in the second shell part, a middle channel of the U-shaped magnet serves as a lubricating oil flowing channel, a conductive coating is arranged on the inner side face of the opening end of the U-shaped magnet, and meanwhile an electric isolation layer is further arranged to ensure that electrodes at the two ends of the U-shaped magnet have the switch function. When the space between the electrodes at the two ends of the U-shaped magnet is filled with the ferromagnetic particles, an alarm signal can be sent out, and effective capturing and monitoring of the ferromagnetic particles in an engine oil system are achieved. The improved magnetic attraction sensor structure greatly enhances the magnetic attraction effect, so that the improved magnetic attraction sensor structure has higher accuracy and reliability when being used for online lubricating oil monitoring.

Description

Technical Field

[0001] The invention relates to the technical field of oil wear debris monitoring and capturing, and in particular to a magnetic absorption sensor for ferromagnetic particles of aircraft engine lubricating oil. Background Art

[0002] The lubricating oil system of aircraft engines is an effective device to ensure the safety of its mechanical rotation. Especially for aircraft engines used in fighter jets, the metal wear debris content in their lubricating oil is much higher than that of civil aircraft. For this reason, conventional military aircraft engines are equipped with ferromagnetic wear debris magnetic suction sensors in the oil return path of their lubricating oil pipelines to monitor and capture metal wear debris.

[0003] Through the study of the existing technology, it is found that a dual-pole structure is used as a magnetic suction component. When the space between the two poles is filled with ferromagnetic abrasive particles, the conductive layer on the surface of the poles is connected, and the A and B electrodes send out signals, which are transmitted to the instrument panel display in the flight control room. However, in specific applications, the two poles need to have a strong enough suction force to be able to absorb the smallest possible iron filings in the flowing lubricating oil. However, the magnetic field strength that can be achieved by existing magnetic pole materials is limited, and its ability to absorb ferromagnetic abrasive particles is also limited, and it is impossible to achieve effective adsorption of iron filings of different particle sizes. In addition, the existing lubricating oil magnetic suction sensor is also unable to achieve quantitative analysis of the ferromagnetic particles it adsorbs. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor, and the present invention is implemented as follows:

[0005] An aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor, comprising:

[0006] Shell, U-shaped magnet, connecting wire and alarm device;

[0007] The housing comprises a first housing portion and a second housing portion;

[0008] The first housing portion is adapted to be fitted to the lubricating oil pipeline to be tested;

[0009] The U-shaped magnet is disposed in the second housing portion, and the middle channel of the U-shaped magnet is configured as a lubricating oil flow channel;

[0010] A first conductive coating, a second conductive coating and an electrical isolation layer are provided on the inner side surface of the open end of the U-shaped magnet, and the electrical isolation layer is provided between the first conductive coating and the second conductive coating;

[0011] The connecting wire includes a first connecting lead wire arranged on the N pole of the U-shaped magnet and a second connecting lead wire arranged on the S pole of the U-shaped magnet;

[0012] When the first connecting lead and the second connecting lead are connected by the ferromagnetic particles, the U-shaped magnet, the connecting wire and the alarm device form a loop, and the alarm device outputs an alarm signal.

[0013] Furthermore, the shell also includes a third shell part, which is arranged at the tail end of the second shell part and is interconnected with the second shell part. A U-shaped frame with the same structure as the U-shaped magnet is provided in the third shell part, and a number of optical fiber magnetic field measurement sensors are evenly spaced on the U-shaped frame.

[0014] Furthermore, the detection range of a plurality of optical magnetic field measurement sensors can completely cover the cross-sectional area of ​​the lubricating oil flow channel.

[0015] Furthermore, the U-shaped magnets are arranged in parallel and at intervals.

[0016] Furthermore, the U-shaped magnet is of integrated or split type;

[0017] The split U-shaped magnet includes two first magnetic strips which are parallel to each other and have opposite polarities, and a second magnetic strip which is laterally connected to the bottom of the two first magnetic strips.

[0018] Furthermore, the electrical isolation layer is arranged at any position of the bottom or side wall of the opening end of the U-shaped magnet.

[0019] Furthermore, the electrical isolation layers of the multiple U-shaped magnets are respectively arranged at different positions of the opening end of the U-shaped magnet, and the combination of the electrical isolation layers on the multiple U-shaped magnets can completely cover the inner side surface of the opening end of the U-shaped magnet.

[0020] Compared with the prior art, the present application can obtain the following technical effects:

[0021] The present invention designs a double-shell structure magnetic sensor and connects it in series to the oil return pipe section of the engine oil system, wherein the first shell part is adapted to the size of the oil return pipe, and the second shell part encapsulates a U-shaped magnet, the middle channel of the U-shaped magnet serves as the oil flow channel, and a conductive coating is provided on the inner side surface of the open end of the U-shaped magnet, and an electrical isolation layer is also provided to ensure that the electrodes at both ends have a switching function. When the space between the electrodes at both ends of the U-shaped magnet is filled with ferromagnetic particles, an alarm signal can be issued, thereby achieving effective capture and monitoring of ferromagnetic particles in the engine oil system. The improved magnetic sensor structure of the present invention greatly enhances the magnetic attraction effect, making it more accurate and reliable when used for online oil monitoring.

[0022] The optical fiber magnetic field measurement sensor is further designed to simultaneously obtain the magnetic field strength of the ferromagnetic particles and accurately determine the accumulation of the ferromagnetic particles. Multiple groups of U-shaped ferromagnetic particles are connected in parallel to form a multi-level magnetic suction unit to prevent adsorption omissions and accurately obtain the accumulation state of ferromagnetic particles in unit time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the examples of the present invention or the technical solutions in the prior art or the drawings required for use in the description of the prior art, a brief introduction is given. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the structure of an existing dual-pole magnetic attraction component.

[0025] Figure 2 This is a schematic diagram of the structure of a U-shaped magnet in an implementation manner of Example 1.

[0026] Figure 3 This is a schematic structural diagram of a U-shaped magnet in another implementation manner of Example 1.

[0027] Figure 4 Schematic diagram of the external structure of the magnetic sensor.

[0028] Figure 5 It is a schematic cross-sectional view of the second shell part.

[0029] Figure 6 It is a schematic cross-sectional view of the third shell part.

[0030] Figure 7 This is a schematic diagram of the structure of a second embodiment in which a plurality of U-shaped magnets are arranged in parallel and at intervals.

[0031] In the figure:

[0032] 10-housing, 11-first housing part, 12-second housing part, 13-third housing part;

[0033] 20-U-shaped magnet, 21-N pole, 22-S pole, 23-first conductive coating, 24-second conductive coating, 25-electrical isolation layer;

[0034] 30-connecting wire, 31-first connecting lead, 32-second connecting lead;

[0035] 40- ferromagnetic particles;

[0036] 50-double pole;

[0037] 60-Fiber optic magnetic field measurement sensor. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but only represents selected embodiments of the present invention.

[0039] The content and size of ferromagnetic particles in the lubricating oil system often indicate the potential mechanical wear inside the engine. To ensure the safe and reliable operation of the engine, it is necessary to monitor the oil state of the lubricating oil system in real time and capture the ferromagnetic particles generated under extreme working conditions to prevent the ferromagnetic particles from flowing back into the lubricating oil system and causing secondary wear. Figure 1 The existing ferromagnetic particle capture sensor is generally set on the oil return pipeline, and uses a double-pole 50 magnetic suction component to collect ferromagnetic particles. However, the existing double-pole magnetic suction structure has limited magnetic suction force and is difficult to effectively absorb smaller particles of wear debris in the flowing lubricating oil. The present invention is based on the existing technology and aims to provide a magnetic suction sensor structure that can enhance the magnetic suction force and can quickly alarm. The specific implementation is as follows:

[0040] Embodiment 1:

[0041] Reference Figure 2-5 The present invention discloses a magnetic sensor for ferromagnetic particles of aircraft engine lubricating oil. The magnetic sensor is connected in series on the oil return pipeline of the aircraft engine lubricating oil system, and comprises:

[0042] The housing 10 of the magnetic sensor, the U-shaped magnet 20, the connecting wire 30 and the alarm device;

[0043] The housing 10 includes a first housing portion 11 and a second housing portion 12;

[0044] The first shell part 11 is a round tube structure, suitable for the lubricating oil pipeline to be tested, and can be disassembled for cleaning or replacement for pipeline docking and oil introduction; the second shell part 12 is a rectangular shell or a cylindrical shell.

[0045] The interior of the second shell part 12 is hollow and is connected to the first shell part 11. In this embodiment, a U-shaped slot is provided inside the second shell part 12 for embedding a U-shaped magnet 20 and passes through the second shell part 12. The U-shaped magnet 20 is encapsulated in the U-shaped slot, and the middle channel of the U-shaped magnet 20 is set as a lubricating oil flow channel. The U-shaped magnet 20 is used, and the special shape makes the magnetic field lines more concentrated, thereby improving the magnetic strength and enhancing the magnetic attraction effect of the sensor.

[0046] In this embodiment, the U-shaped magnet 20 is made of high-energy magnetic materials, such as neodymium iron boron magnets, etc., which have better magnetic attraction performance than traditional magnet materials.

[0047] The inner side surface of the open end of the U-shaped magnet 20 is provided with a first conductive coating 23, a second conductive coating 24 and an electrical isolation layer 25, and the electrical isolation layer 25 is provided between the first conductive coating 23 and the second conductive coating 24 to form an open circuit; the U-shaped magnet 20 generally has only weak conductivity, and it is difficult to achieve rapid circuit conduction. In this embodiment, a conductive coating is provided at the open end of the U-shaped magnet, and an electrical isolation layer is used to electrically isolate the N and S poles of the U-shaped magnet. The electrical isolation layer can effectively prevent the U-shaped magnet from conducting current before the ferromagnetic particles are adsorbed, thereby preventing the line from short-circuiting, leaking or being interfered with by the outside.

[0048] The connecting wire 30 includes a first connecting lead 31 disposed on the N pole 21 of the U-shaped magnet and a second connecting lead 32 disposed on the S pole 22 of the U-shaped magnet;

[0049] When the first connecting lead 31 and the second connecting lead 32 are connected by the ferromagnetic particles 40, the U-shaped magnet 20, the connecting wire 30 and the alarm device form a loop, and the alarm device outputs an alarm signal. According to the output alarm signal, the accumulation of ferromagnetic particles 40 in the oil can be effectively obtained, and effective oil health monitoring can be performed.

[0050] Reference Figure 2 In one implementation of this embodiment, the electrical isolation layer 25 is disposed at the U-shaped bottom end of the opening end of the U-shaped magnet 20, or, refer to the attached Figure 3 In another implementation of this embodiment, the electrical isolation layer 25 is disposed at any position of the open end of the U-shaped magnet 20 to form an open circuit.

[0051] Reference Figure 6Furthermore, the shell also includes a third shell part 13, which is arranged at the tail end of the second shell part 12 and is interconnected with the second shell part 12. A U-shaped frame with the same structure as the U-shaped magnet is provided in the third shell part, and a plurality of optical fiber magnetic field measurement sensors 60 are arranged on the U-shaped frame by equidistant arrangement, symmetrical arrangement or staggered arrangement, and the detection surface of the optical fiber magnetic field measurement sensor is arranged toward the inner side of the opening end of the U-shaped magnet. In other embodiments, the optical fiber magnetic field measurement sensor 60 can be arranged according to the propagation characteristics of the optical fiber in the oil, combined with the refractive index change, etc., to ensure that the detection range of a plurality of optical fiber magnetic field measurement sensors 60 can completely cover the cross-sectional area of ​​the lubricating oil flow channel, and the magnetic field strength of the ferromagnetic particles adsorbed on the U-shaped magnet can be obtained at the same time through the optical fiber magnetic field measurement sensor, so that the magnetic absorption sensor not only has an alarm function but also can accurately judge the accumulation of ferromagnetic particles.

[0052] In this embodiment, a special corrosion-resistant material is used as the protective material of the optical fiber magnetic field measurement sensor to ensure that it can be used in oil for a long time without degradation or chemical reaction.

[0053] Embodiment 2:

[0054] Reference Figure 7 This embodiment is a further improvement on the first embodiment. In this embodiment, the U-shaped magnet 20 is arranged to be composed of a plurality of parallel and spaced magnets. The plurality of U-shaped magnets 20 are combined together so that the magnetic fields overlap with each other to enhance the overall magnetic force. At the same time, the plurality of U-shaped magnets 20 are arranged in parallel and spaced to form a multi-level monitoring and alarm unit. When the oil flows through the U-shaped magnets, it is adsorbed step by step to prevent adsorption omissions during the rapid flow of the oil.

[0055] Furthermore, the magnetic sensor is connected to the oil return pipeline via a flange. When the multi-stage monitoring alarm units of the magnetic sensor all sound an alarm, the magnetic sensor can be disassembled to clean the ferromagnetic particles between the U-shaped magnets.

[0056] Embodiment three:

[0057] This embodiment is an improvement made on the basis of the first or second embodiment, wherein the U-shaped magnet 20 embedded in the U-shaped magnet 20 can be an integrated type or a split type; the integrated U-shaped magnet is a complete U-shaped magnet 20; and the split U-shaped magnet 20 includes two first magnetic strips that are parallel to each other and have opposite polarities, and a second magnetic strip that is horizontally connected to the bottom of the two first magnetic strips. The first magnetic strip and the second magnetic strip can be made of the same or different magnetic materials to improve the overall magnetic attraction effect of the U-shaped magnet.

[0058] Embodiment 4:

[0059] This embodiment is an improvement on the second embodiment. The ferromagnetic particles in the oil flow with the oil and are generally adsorbed by the portion of the U-shaped magnet 20 that is closest to it. Therefore, in this embodiment, the electrical isolation layer is set at any position of the bottom or side wall of the open end of the U-shaped magnet 20. In the case of multiple U-shaped magnets 20, the electrical isolation layers on different U-shaped magnets 20 are respectively set at different positions of their open ends, and the combination of the electrical isolation layers on multiple U-shaped magnets 20 can completely cover the inner side of the open end of the U-shaped magnet. When the oil flows through the magnetic sensor, it is adsorbed by the adjacent part of the U-shaped magnet 20. When the part reaches the conduction alarm condition, an alarm prompt is given, overcoming the eccentricity phenomenon when the ferromagnetic particles pass through the magnetic sensor, and further improving the accuracy of the alarm rate of the magnetic sensor.

[0060] In this embodiment, the optical fiber magnetic field measurement sensor 60 performs detection after the U-shaped magnet 20 is turned on and the alarm is sounded. All optical fiber magnetic field measurement sensors can be started to detect the ferromagnetic particle content in the entire range of the lubricating oil flow channel, or one or more optical fiber magnetic field measurement sensors at the corresponding position can be selected according to the position of the electrical isolation layer on the alarm U-shaped magnet 20 to perform ferromagnetic particle content detection.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor, characterized in that: include: Housing, U-shaped magnet, connecting wire and alarm device; The housing comprises a first housing portion and a second housing portion; The first housing portion is adapted to be fitted to the lubricating oil pipeline to be tested; The U-shaped magnet is disposed in the second housing portion, and a middle passage of the U-shaped magnet is configured as a lubricating oil flow passage. A first conductive coating, a second conductive coating and an electrical isolation layer are provided on the inner side surface of the open end of the U-shaped magnet, and the electrical isolation layer is provided between the first conductive coating and the second conductive coating; The connecting wire includes a first connecting lead wire arranged on the N pole of the U-shaped magnet and a second connecting lead wire arranged on the S pole of the U-shaped magnet; When the first connecting lead and the second connecting lead are connected by the ferromagnetic particles, the U-shaped magnet, the connecting wire and the alarm device form a loop, and the alarm device outputs an alarm signal.

2. The aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor according to claim 1, characterized in that: The shell also includes a third shell part, which is arranged at the tail end of the second shell part and is interconnected with the second shell part. A U-shaped frame with the same structure as the U-shaped magnet is arranged in the third shell part, and a plurality of optical fiber magnetic field measurement sensors are arranged on the U-shaped frame at equal intervals. The optical fiber magnetic field measurement sensors measure the magnetic field strength of the ferromagnetic particles adsorbed on the U-shaped magnet.

3. The aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor according to claim 2, characterized in that: The detection range of a plurality of optical magnetic field measurement sensors can completely cover the cross-sectional area of ​​the lubricating oil flow channel.

4. The aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor according to claim 1, characterized in that: The U-shaped magnets are provided in plurality and arranged at equal intervals.

5. The aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor according to claim 4, characterized in that: The U-shaped magnet is of integrated or split type; The split U-shaped magnet includes two first magnetic strips which are parallel to each other and have opposite polarities, and a second magnetic strip which is laterally connected to the bottom of the two first magnetic strips.

6. The aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor according to claim 4, characterized in that: The electrical isolation layer is arranged at any position of the bottom or side wall of the opening end of the U-shaped magnet.

7. The aircraft engine lubricating oil ferromagnetic particle magnetic absorption sensor according to claim 6, characterized in that: The electrical isolation layers of the multiple U-shaped magnets are respectively arranged at different positions of the opening end of the U-shaped magnet, and the combination of the electrical isolation layers on the multiple U-shaped magnets can completely cover the inner side surface of the opening end of the U-shaped magnet.

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