Engine oil abrasive particle detection device and detection method

Abstract

The application discloses an engine oil abrasive particle detection device, and relates to the technical field of engine fault detection. The device comprises a detection channel, an abrasive particle collecting and distributing device and a detection unit. The detection channel is connected with an oil pipeline, and an oil inlet and an oil outlet connected with the oil pipeline are arranged at two ends of the detection channel. The abrasive particle collecting and distributing device is arranged on the detection channel, and is used for intercepting and collecting abrasive particles in the oil within a first set time and releasing the collected abrasive particles within a second set time. The detection unit is arranged on one side of the oil outlet. The detection unit can output an index real value corresponding to the number of abrasive particles in the oil according to the number of the abrasive particles. Meanwhile, the application also provides a detection method. During detection, the abrasive particle collecting and distributing device is used to intercept and release the abrasive particles in the detection channel. The generated induction electromotive force of the abrasive particles is compared with a set abnormal alarm threshold value, the over-standard situation of the oil abrasive particles is judged, and whether the engine is faulty can be conveniently and quickly judged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine fault detection, in particular to an engine oil abrasive particle detection device and detection method. BACKGROUND

[0002] The aviation turbine engine provides power for the airplane and is one of the most important systems of the airplane. The rotor speed of the turbine engine is generally as high as tens of thousands of revolutions per minute. Important components such as rotor support bearings, transmission shafts, gears, oil pumps and the like in the engine oil system operate in a harsh environment of high temperature, high speed, large load and alternating stress, and the failure rate is high. Once these components are abnormally worn, they can quickly fail, causing structural damage and failure of the engine, rapid drop or disappearance of the airplane thrust, and even causing flight accidents. In the process of airplane flight, if the early failure of the important components can be found in time before the failure is expanded to a serious failure, emergency disposal can be performed, thereby greatly reducing the flight accident rate.

[0003] Currently, vibration monitoring, noise and other online monitoring methods are mainly used to monitor the operation status of the important components of the airplane engine at home and abroad. However, due to the extremely complex vibration environment of the engine on the airplane, there are many noise and vibration sources, and it is difficult to effectively capture the noise or vibration information generated due to the early failure of the key components such as the support bearings, transmission shafts and transmission gears of the engine in the high and chaotic background noise. Generally, the vibration and noise monitoring system can only collect and judge the failure of the engine when the components have been severely damaged and have caused secondary damage to the engine, and the early warning and emergency disposal time is too short, which often causes catastrophic accidents.

[0004] In recent years, more and more oil monitoring, periodic disassembly detection, flaw detection and other methods are used to monitor the failure of the important components such as the rotor support bearings, transmission shafts and transmission gears of the engine at home and abroad. However, the methods need to be performed when the airplane is on the ground and the engine is stopped, which greatly increases the cost of the airplane and reduces the attendance rate. The oil monitoring generally needs to collect the oil from the oil system when the engine is stopped, and the oil is detected in the laboratory environment by using special equipment, which has a long cycle and cannot monitor the oil of the engine in flight in real time. The detection opportunity lags behind the failure opportunity, has poor timeliness, and cannot timely reflect whether the engine of the airplane currently has a failure. SUMMARY

[0005] The main purpose of the present application is to provide an engine oil abrasive particle detection device and detection method, which aims to solve the problems of poor convenience and timeliness of engine failure detection in the prior art.

[0006] The technical scheme adopted by the present application is as follows:

[0007] First aspect:

[0008] The present application provides an engine oil abrasive particle detection device, which comprises:

[0009] a detection channel, which is connected with the lubricating oil pipeline and has an oil inlet and an oil outlet at two ends of the detection channel, the oil inlet and the oil outlet being connected with the lubricating oil pipeline;

[0010] a grinding particle collecting and releasing device, which is arranged on the detection channel and is used for intercepting and collecting the grinding particles in the lubricating oil within a first set time and releasing the collected grinding particles within a second set time;

[0011] a detection unit, which is arranged on one side of the oil outlet and is used for outputting an index true value corresponding to the number of the grinding particles in the lubricating oil according to the number of the grinding particles.

[0012] Optionally, the grinding particle collecting and releasing device is one or a combination of the electromagnetic collecting and releasing mechanism and the filter screen collecting and releasing mechanism.

[0013] Optionally, the electromagnetic collecting and releasing mechanism comprises:

[0014] a first collecting and releasing unit, which comprises a collecting and releasing part, the collecting and releasing part being capable of electrostatically adsorbing the grinding particles and releasing the grinding particles.

[0015] Optionally, the first collecting and releasing unit is an electromagnet, the electromagnet being arranged on the outer wall of the detection channel, the collecting and releasing part being a core of the electromagnet, and the core being arranged in the detection channel.

[0016] Optionally, the filter screen collecting and releasing mechanism comprises a filter screen assembly arranged in the detection channel, the filter screen assembly being rotatably arranged in the detection channel, and when a section where the filter screen assembly is located is perpendicular to the detection channel, the filter screen assembly collects the grinding particles, and when the section where the filter screen assembly is located is parallel to the detection channel, the filter screen assembly releases the collected grinding particles.

[0017] Optionally, the filter screen assembly comprises:

[0018] a filter screen frame, which is arranged in the detection channel and has a filter screen arranged therein;

[0019] a rotary motor, which is arranged on the outer wall of the detection channel;

[0020] a connecting shaft, one end of the connecting shaft being fixedly connected with the filter screen frame, and the other end of the connecting shaft extending out of the detection channel from inside to outside and being in transmission connection with the rotary motor.

[0021] Optionally, a group of copper wires spirally wound are attached to the surface of the filter screen towards the oil inlet side, the copper wires are spaced from each other, the copper wires extend out of the detection channel via the rotating shaft, and the two copper wires are respectively connected to the positive and negative poles of an external detection circuit.

[0022] Optionally, the external detection circuit comprises a power supply, a resistor and a light emitting diode connected in series, when the metal abrasive particles are attached between the copper wires to make the external detection circuit connected, the light emitting diode emits light.

[0023] Optionally, when the abrasive particle collecting and dispersing device is a combined structure, the detection channel has two parallel branch channels, and the electromagnetic collecting and dispersing mechanism and the filter screen collecting and dispersing mechanism are respectively arranged on each branch channel.

[0024] Second aspect:

[0025] The application provides a detection method of engine oil abrasive particles, and the engine oil abrasive particle detection device is applied, and the detection method comprises the following steps:

[0026] The abrasive particles in the detection channel are intercepted by using the abrasive particle collecting and dispersing device;

[0027] After a first set time, the abrasive particles intercepted by the abrasive particle collecting and dispersing device are released;

[0028] Since the abrasive particles are released, within a second set time, the detection unit processes to obtain an index real value according to the number of abrasive particles flowing through;

[0029] The index real value is compared with an abnormal alarm threshold value to determine whether the oil abrasive particles exceed the standard.

[0030] Compared with the prior art, the application has the following beneficial effects:

[0031] The application can collect and release the abrasive particles in the oil by setting the abrasive particle collecting and dispersing device. When the abrasive particles in the oil are detected, the abrasive particles in the oil are collected in advance by the abrasive particle collecting and dispersing device, so that the abrasive particles are accumulated in the abrasive particle collecting device, the volume signal of the abrasive particles is amplified in advance, the accumulated abrasive particles are released to the side of the detection unit after a period of accumulation, the accumulated abrasive particles can effectively amplify the abrasive particle signal in the oil, the detection signal amplitude of the detection unit can be greatly improved, the abrasive particles in the oil can be found more easily, the difficulty of the sensor in detecting small abrasive particles is reduced, and the detection process does not need to be stopped, the detection convenience and timeliness are obviously improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 A structural schematic diagram of an engine oil abrasive particle detection device provided by the application in one view;

[0033] Fig. 2 A circuit schematic diagram of an engine oil abrasive particle detection device provided in an embodiment of the present application is provided.

[0034] Fig. 3 A structural schematic diagram of another engine oil abrasive particle detection device provided in an embodiment of the present application is provided from one perspective.

[0035] Fig. 4 A structural schematic diagram of another engine oil abrasive particle detection device provided in an embodiment of the present application is provided from another perspective.

[0036] Fig. 5 A circuit schematic diagram of another engine oil abrasive particle detection device provided in an embodiment of the present application is provided.

[0037] Fig. 6 A structural schematic diagram of another engine oil abrasive particle detection device provided in an embodiment of the present application is provided from one perspective.

[0038] Fig. 7 A circuit schematic diagram of another engine oil abrasive particle detection device provided in an embodiment of the present application is provided.

[0039] Explanation of reference numerals in the drawings:

[0040] 1 - abrasive particle collection device, 2 - detection channel. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. Those of ordinary skill in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0044] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0045] When the important parts of the aircraft engine lubricating oil system return oil to the lubricating oil tank, a large number of normal small abrasive particles are usually contained in the lubricating oil. In the initial stage of abnormal wear of the aircraft engine bearing, transmission shaft, transmission gear and other parts, small abnormal metal abrasive particles will fall off from the friction pair. The metal abrasive particles enter the lubricating oil pipeline with the lubricating oil. If the number or concentration of abnormal abrasive particles per unit volume of lubricating oil reaches a certain value or the growth rate per unit time reaches a certain value, it indicates that a certain part of the engine has abnormal wear. If the abnormal change of the micro abrasive particles in the engine lubricating oil pipeline can be monitored online, the early failure of the friction pair of the bearing, transmission shaft and transmission gear can be found in time, which provides a feasible scheme for detecting engine failure.

[0046] However, considering that the initial damage of the key parts in the engine lubricating oil system releases particles with a diameter of about 15-150 μm, it is necessary to study how to first amplify the micro abrasive particles in the engine lubricating oil itself to reduce the design difficulty of the online monitoring system.

[0047] The present application not only innovatively proposes the idea of detecting whether the engine has failed by detecting the change of the number of abrasive particles in the engine lubricating oil pipeline, but also proposes how to solve the problem of high detection difficulty caused by the small particle size of the abrasive particles.

[0048] Specifically, the scheme is as follows:

[0049] The engine lubricating oil abrasive particle detection device provided by the embodiments of the present application comprises a detection channel 2, an abrasive particle collection and dispersion device 1 and a detection unit, wherein:

[0050] The detection channel 2 is connected with the lubricating oil pipeline, so that the lubricating oil flowing through the lubricating oil pipeline also flows through the detection channel. The two ends of the detection channel are respectively provided with an oil inlet and an oil outlet, so as to be connected with the lubricating oil pipeline;

[0051] The abrasive particle collecting and releasing device 1 is arranged on the detection channel 2, and is used for intercepting and collecting the abrasive particles in the lubricating oil within a first set time and releasing the collected abrasive particles within a second set time.

[0052] The detection unit is arranged on one side of the oil outlet, and is used for outputting an index true value corresponding to the number of the abrasive particles in the lubricating oil according to the number of the abrasive particles.

[0053] It can be imagined that, since the particle size released by the initial damage of the key components in the engine lubricating oil system is about 15-150 μm, the abrasive particle collecting and releasing device 1 can effectively improve the detection capability of the metal abrasive particles in the lubricating oil and reduce the requirement for the detection performance of the detection unit by collecting and then releasing the abrasive particles in the lubricating oil, which is similar to the case that a ruler is used to measure the thickness of a paper in the case that a micrometer is not available. In this case, the paper can be folded several times to a certain thickness, and the total thickness of the paper can be directly measured by using the ruler, and then the thickness of a single paper can be calculated by dividing the number of the paper, instead of using the micrometer to measure the thickness of the paper, so that a detection unit with high performance is not required.

[0054] In the embodiment, the detection unit is an inductive sensor, and it can be imagined that, before the abrasive particles flow into the inductive abrasive particle sensor, the abrasive particles in the lubricating oil flow are first collected by the abrasive particle collecting and releasing device, and then the aggregated abrasive particles are released when the abrasive particles are aggregated to a certain number. A large number of released abrasive particles enter the sensor, which causes the magnetic field intensity in the excitation coil of the sensor to change, so that the magnetic flux in the detection coil changes correspondingly. The change of the magnetic flux generates an induced electromotive force, which is the true index reference value. The induced electromotive force generated in the detection coil is compared with the set abnormal alarm threshold value, so that it can be judged whether the engine has a fault.

[0055] In the embodiment, based on the arrangement of the abrasive particle collecting and releasing device 1, in the case that the sizes of the abrasive particles are the same, the magnetic flux change caused by the multiple abrasive particles entering the excitation coil of the inductive sensor at the same time is far greater than the magnetic flux change value caused by a single metal abrasive particle entering the excitation coil of the inductive sensor, which can effectively amplify the metal abrasive particle signal in the lubricating oil and effectively reduce the difficulty of the sensor in detecting small abrasive particles, so that the abrasive particles in the lubricating oil can be more easily found.

[0056] Of course, it can be understood that different types of engines, different number of abrasive particles, growth rate corresponding to different induced electromotive force, through the data statistics, iteration, based on statistical method to determine the engine oil abrasive particle abnormal range corresponding to the induced electromotive force abnormal alarm threshold, the alarm threshold as the important criterion for judging whether the engine oil system components are abnormal. If the engine oil system is monitored online, the metal abrasive particles in the oil are measured periodically by this method and compared with the alarm threshold, so as to realize online fault warning. It should be noted that the statistical induced electromotive force abnormal alarm threshold and the actual aircraft motion detection method are completely the same, and both need to meet the time length of collecting oil abrasive particles as the first set time and the time length of releasing oil abrasive particles as the second set time, so as to calculate the induced electromotive force abnormal alarm threshold.

[0057] In addition, in this embodiment, the amplification signal effect of the abrasive particle collecting and releasing device 1 can be obtained by comparing the ratio ε of the number of oil abrasive particles released into the inductive abrasive particle sensor excitation coil L1 by the abrasive particle collecting mechanism and the number of oil abrasive particles entering the inductive abrasive particle sensor excitation coil L1 without using the abrasive particle collecting mechanism. Assuming that the oil flow is uniform, the calculation is as follows:

[0058]

[0059] In the formula, ε represents the amplification multiple of the abrasive particle signal, Ф2 represents the number of abrasive particles released into the excitation coil L by the abrasive particle collecting and releasing device, with the unit of milligrams (mg), Ф1 represents the number of abrasive particles entering the excitation coil L1 without using the abrasive particle collecting and releasing device, with the unit of milligrams (mg), η represents the aggregation efficiency coefficient of the abrasive particle collecting and releasing device, ζ represents the efficiency coefficient of the abrasive particle collecting and releasing device, t1 represents the time of each aggregation period of the abrasive particle collecting and releasing device, i.e. the first set time, with the unit of seconds (s), and t2 represents the time of each abrasive particle releasing period of the abrasive particle collecting and releasing device, i.e. the second set time, with the unit of seconds (s).

[0060] The use of the abrasive particle collecting and releasing device can increase the concentration of abrasive particles entering the inductive abrasive particle sensor excitation coil L1 by times, thereby effectively increasing the change amount of magnetic induction intensity in the sensor excitation coil L1, and further improving the induced electromotive force in the sensor detection coil L1.

[0061] To improve the induced electromotive force of the inductive abrasive particle sensor to the metal abrasive particles in the oil, the following parameters of the abrasive particle collecting and releasing device can be optimized:

[0062] First, improve the η aggregation efficiency coefficient to improve the capture and aggregation ability of the abrasive particle collecting and releasing device to the abrasive particles in the oil.

[0063] Second, improve the ζ release efficiency coefficient. Abrasive particles gathered in the release device, should be as far as possible to release the abrasive particles thoroughly.

[0064] Third, improve the t1 aggregation period. The greater the t1 aggregation period, the more obvious the effect is, but, t1 too long will affect the timeliness of online monitoring, at the same time, too much abrasive particles gathered in the abrasive particles gathering and releasing device may block the oil passage. According to the different type engine oil system timeliness of abrasive particles release rule, need to choose the appropriate t1 aggregation period, similarly, t1 can be obtained by statistics.

[0065] Fourth, reduce t2 release period. Shorten the abrasive particles gathering and releasing device t2 release period, make the abrasive particles release quickly, is conducive to the released abrasive particles as far as possible to concentrate in the oil of a small section, improve the abrasive particles concentration of the section of oil.

[0066] In order to realize the gathering and release of abrasive particles, in this embodiment, the abrasive particles gathering and releasing device is electromagnetic, specifically:

[0067] Referring to Figs. 1-2 As shown in the figure, the electromagnetic abrasive particles gathering and releasing device includes a first gathering and releasing unit, the first gathering and releasing unit includes a gathering and releasing part, the gathering and releasing part can be charged to adsorb abrasive particles and release abrasive particles. As an option, the first gathering and releasing unit is an electromagnet, the electromagnet is arranged on the outer wall of the detection channel, the gathering and releasing part is the core of the electromagnet, and the mounting hole is vertically arranged on the outer wall of the detection channel in the direction of the flowing oil. The core is placed in the detection channel through the mounting hole, and the mounting hole where the core is located is sealed to prevent oil leakage. It is not difficult to understand that by electrifying the electromagnet, a magnetic field is generated around the core, so that the metal particles in the oil can be adsorbed and gathered on the core. When the electromagnet is deenergized, the metal particles adsorbed on the core can be released, so as to achieve the collection and release of the metal particles in the oil.

[0068] As an electromagnetic abrasive particles gathering and releasing device, the detection channel needs to be made of magnetic inert material or diamagnetic material into a circular tubular shell, and the two ends are connected with the oil pipeline. At the same time, the core in the detection channel is made into a target type structure, which increases the effective contact area of the core and the oil in the shell, which is conducive to improving the adsorption and aggregation efficiency η of the core to the metal particles in the oil, so as to improve the abrasive particles gathering effect. Of course, it can be understood that the core in the abrasive particles gathering and releasing device should be made of high-quality soft magnetic material with as small residual magnetism as possible, and a layer of oil-resistant insulating coating is sprayed on the core or the core is treated by spraying, ceramic spraying, etc., so as to improve the corrosion resistance of the core and increase the service life of the core.

[0069] At the same time, in this embodiment, another structure of the abrasive particles gathering and releasing device is also provided, specifically:

[0070] Referring to Figs. 3-5As shown, here, the abrasive particle collecting and dispersing device is a filter screen type abrasive particle collecting and dispersing device, which can filter and block the metal abrasive particles in the aggregated lubricating oil pipeline. The filter screen type abrasive particle collecting and dispersing device is similar to a ball valve, and includes a filter screen assembly rotatably arranged in a detection channel. The filter screen assembly includes a filter screen frame, a rotating motor and a connecting shaft. The filter screen frame is made of fluoroplastic. The connecting shaft is fixed to the filter screen frame. The connecting shaft penetrates the detection channel vertically upward and is connected to the rotating motor through a shaft coupling. A sealing sleeve is sleeved on the connecting shaft to maintain the sealing of the detection channel. The inside center of the filter screen frame is a spherical cavity. The spherical cavity has a disc-shaped nylon filter screen. Therefore, when the abrasive particles are aggregated in the lubricating oil, the nylon filter screen is at a 90° angle with the flow direction of the lubricating oil, so as to filter and aggregate the metal abrasive particles in the lubricating oil. After each aggregation of t1 (i.e. the first set time) seconds, the rotating motor is powered to rotate rapidly. The disc-shaped nylon filter screen is driven by the connecting shaft to rotate 90° immediately. The nylon filter screen is at a 0° angle with the flow direction of the lubricating oil. The numerous metal abrasive particles collected on the nylon filter screen are flushed off the filter screen by the lubricating oil flow instantaneously. The numerous metal abrasive particles enter the inductive sensor exciting coil with the flowing lubricating oil and experience t2 seconds (i.e. the second set time). The numerous metal abrasive particles cause the magnetic induction intensity in the inductive sensor coil to change. The magnetic induction intensity of the exciting coil and the magnetic induction intensity of the exciting coil appear a difference value, which causes the magnetic flux in the sensor induction coil to change, thereby causing an induced electromotive force to appear in the sensor induction coil. The induced electromotive force is compared with an abnormal induced electromotive force alarm threshold value, so as to determine whether the engine is malfunctioning.

[0071] Meanwhile, in order to further improve the timeliness of detection and to detect abnormal abrasive particles suddenly appearing in the lubricating oil in time, in the filter screen type abrasive particle collecting and dispersing device, a group of two spiral copper wires are attached to the surface of the nylon filter screen towards the oil inlet side. The two spiral copper wires are spaced apart from each other. The two parallel spiral copper wires form an open circuit through which direct current passes. The open circuit through which direct current passes is an external detection circuit. The circuit is provided with a power supply, a resistor, a light-emitting diode and the like. One of the two spiral copper wires is connected to the positive electrode of the circuit, and the other is connected to the negative electrode of the circuit. The two parallel spiral copper wires are extended outwardly through the hollow connecting shaft connected to the filter screen frame and connected to the external detection circuit. When abnormal wear metal particles, metal wires or a large number of abnormal abrasive particles suddenly increase in the lubricating oil flow through the nylon filter screen, the metal particles can be quickly aggregated near the two parallel spiral copper wires of the filter screen. After a certain amount of aggregation, the metal abrasive particles can fill the gap between the two spiral copper wires. The metal abrasive particles in the gap can conduct the two parallel spiral copper wires, causing the direct current circuit of the copper wires to form a closed loop. The light-emitting diode in the direct current circuit emits light to indicate that abnormal metal abrasive particles appear in the lubricating oil. The two copper wires form a light-emitting alarm, which is complementary to the detection result of the inductive sensor on the abrasive particles in the lubricating oil pipeline, so as to effectively reduce the missed detection rate of abnormal abrasive particles in the lubricating oil.

[0072] Of course, it can be imagined that the electromagnetic abrasive particle collecting device can only detect the iron-based abrasive particles in the lubricating oil, and the non-ferrous abrasive particles cannot be gathered on the iron core, so when the electromagnetic abrasive particle collecting device is used, the non-ferrous metal abrasive particles cannot be amplified, and the filter screen type abrasive particle collecting device has the advantage of preventing the inductive sensor from missing the non-ferromagnetic abrasive particles in the lubricating oil. A layer of spiral copper wire is laid on the surface of the nylon filter screen of the gap filter screen abrasive particle collecting device. When the abnormal copper abrasive particles in the lubricating oil are blocked and gathered by the filter screen, multiple abrasive particles are randomly gathered on the surface of the filter screen, gradually filling the gap between the spiral copper wires. According to the conductivity of the metal abrasive particles, the adjacent spiral copper wires are short-circuited by the gathered and filled metal abrasive particles, the copper wire circuit forms a closed loop, the light-emitting diode emits light to warn of the abnormal abrasive particles. Of course, this is an explanation. Under normal abrasive particle conditions, the metal abrasive particles do not have the ability to fill the gap between the adjacent two copper wires within the first set time t1, so under normal abrasive particle conditions, there will be no false positives or false negatives.

[0073] Based on formula (1), in order to maximize the detection probability of abnormal abrasive particles, as long as possible double copper wires are laid on the disc. The length of the spiral copper wire on the disc is mainly restricted by three factors: the shape of the copper wire laying, the diameter of the copper wire, and the gap between the copper wires. Selecting as thin copper wire as possible, as small copper wire gap as possible, and laying spiral copper wire are all conducive to increasing the total length of the copper wire. However, too thin copper wire has too large resistance value and is easy to be damaged, so the diameter of the copper wire cannot be too thin; if the gap between the copper wires is too small and too sensitive, the false alarm rate will be too high, so a too small gap cannot be selected, the size of the abnormal abrasive particle should be considered and the gap should be appropriately selected; the spiral copper wire has a longer length than other shapes. Therefore, the filter screen of the filter screen type abrasive particle collecting device uses spiral double-row thin copper wires for abrasive particle detection.

[0074] The size of the detected abrasive particles is different for different types of engines, and the size of the filter screen aperture is usually slightly smaller than the size of the abnormal particles. According to the characteristics of the engine lubricating oil system, the filter screen aperture can be calculated according to the maximum allowable flow resistance, taking into account both requirements. Appropriately increasing the gathering period t1 of the filter screen type abrasive particle collecting device filter screen is conducive to improving the metal abrasive particle signal of the detected lubricating oil, which can effectively reduce the detection sensitivity requirement of the inductive sensor and the difficulty of its detection circuit. In order to shorten the release period t2 of the abrasive particle collecting device, the rotation speed of the rotating motor driving the nylon filter screen rotating shaft can be appropriately increased, and a speed change gear can be arranged between the rotating motor output shaft and the rotating shaft of the nylon filter screen to increase the transmission ratio and increase the rotation speed of the nylon filter screen. High-speed rotation of the nylon filter screen and emergency stop are conducive to accelerating the separation of the metal abrasive particles gathered on the filter screen under the action of inertial force and centrifugal force, improving the release efficiency coefficient ζ and reducing the release period t2.

[0075] In addition, it can be understood that the electromagnetic abrasive particle collecting and dispersing device fully utilizes the advantages of the electromagnet in adsorbing ferromagnetic abrasive particles to collect and gather the ferromagnetic abrasive particles in the lubricating oil, and periodically releases them to the inductive sensor for detection, which can effectively find the abnormal growth of abrasive particles in the lubricating oil. The filter screen type abrasive particle collecting and dispersing device can filter and gather ferromagnetic abrasive particles and non-ferromagnetic metal abrasive particles in the lubricating oil, and periodically rotate the disc-shaped nylon filter screen to release the gathered metal abrasive particles to the inductive sensor for detection, which can effectively find the abnormal growth of abrasive particles in the lubricating oil. Fully utilizing the advantages of the two types of abrasive particle collecting and dispersing devices and forming backup and complement can effectively reduce the missed detection rate. Therefore, another form of the abrasive particle collecting and dispersing device is a combination of the electromagnetic type and the filter screen type, specifically:

[0076] Referring to Fig. 6 and Fig. 7 As shown, in order to realize the combination of the electromagnetic type and the filter screen type abrasive particle collecting and dispersing devices, two branch channels are arranged between the oil outlet and the oil inlet, and the electromagnetic type abrasive particle collecting and dispersing device and the filter screen type abrasive particle collecting and dispersing device are respectively installed in the branch channels, two streams of lubricating oil flow into the electromagnetic type abrasive particle collecting and dispersing device and the filter screen type abrasive particle collecting and dispersing device respectively to collect and gather metal abrasive particles in the two streams of lubricating oil, forming a parallel type abrasive particle collecting and dispersing device. After the two abrasive particle collecting and dispersing devices, the two streams of lubricating oil are combined by a three-way joint to form a stream of lubricating oil entering the inductive sensor for abrasive particle detection. The parallel type abrasive particle collecting and dispersing device can effectively complement the use of the inductive sensor for abrasive particle detection by staggering the timing of releasing abrasive particles by the electromagnetic type abrasive particle collecting and dispersing device and the filter screen type abrasive particle collecting and dispersing device, and reduce the risk of blocking the lubricating oil pipeline.

[0077] Finally, the application also provides a detection method for engine lubricating oil abrasive particles, which applies the above-mentioned engine lubricating oil abrasive particle detection device, including the following steps:

[0078] First, the abrasive particle collecting and dispersing device is used to intercept and collect metal abrasive particles in the lubricating oil;

[0079] Then, after a first set time t1 seconds, the metal abrasive particle collection is completed, and the abrasive particles collected by the abrasive particle collecting and dispersing device are released;

[0080] Then, after a second set time t2 seconds, the metal abrasive particle release is completed, and the induced electromotive force generated by the number of metal abrasive particles passing through the detection unit is obtained;

[0081] Finally, the induced electromotive force obtained is compared with the abnormal alarm threshold of the induced electromotive force, and whether the number of abrasive particles in the lubricating oil is abnormal is judged.

[0082] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and 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. An engine oil abrasive particle detection device characterized by comprising: The application relates to an engine lubricating oil abrasive particle detection device. The device comprises a detection channel connected with a lubricating oil pipeline, an oil inlet and an oil outlet arranged at two ends of the detection channel and connected with the lubricating oil pipeline, an abrasive particle collecting and releasing device arranged on the detection channel, the abrasive particle collecting and releasing device being used for intercepting and collecting abrasive particles in lubricating oil within a first set time and releasing the collected abrasive particles within a second set time, and a detection unit arranged on one side of the oil outlet, the detection unit being used for outputting an index real value corresponding to the number of abrasive particles in lubricating oil according to the number of the abrasive particles. The abrasive particle collecting and releasing device is a combination of an electromagnetic collecting and releasing mechanism and a filter screen type collecting and releasing mechanism. The filter screen type collecting and releasing mechanism comprises a filter screen assembly arranged in the detection channel, the filter screen assembly being rotatably arranged in the detection channel, the filter screen assembly collecting the abrasive particles when a section where the filter screen assembly is located is perpendicular to the detection channel, and the filter screen assembly releasing the collected abrasive particles when the section where the filter screen assembly is located is parallel to the detection channel. The filter screen assembly comprises a filter screen frame arranged in the detection channel and provided with a filter screen, a rotating motor arranged on an outer wall of the detection channel, a connecting rotating shaft, one end of the connecting rotating shaft being fixedly connected with the filter screen frame, the other end of the rotating shaft extending out of the detection channel from inside to outside and being in transmission connection with the rotating motor, and a surface of the filter screen towards the oil inlet being attached with a group of copper wires spirally wound, the copper wires being spaced from each other, the copper wires extending out of the detection channel through the rotating shaft, and two copper wires being respectively connected to positive and negative poles of an external detection circuit. The external detection circuit comprises a power supply, a resistor and a light emitting diode connected in series, the light emitting diode emitting light when the external detection circuit is connected due to the attachment of metal abrasive particles between the copper wires. The detection channel has two parallel branch channels, one of the branch channels being separately provided with the electromagnetic collecting and releasing mechanism, and the other branch channel being separately provided with the filter screen type collecting and releasing mechanism. The electromagnetic collecting and releasing mechanism comprises a first collecting and releasing unit, the first collecting and releasing unit comprising a collecting and releasing part, the collecting and releasing part being capable of electrostatically adsorbing the abrasive particles and releasing the abrasive particles. The first collecting and releasing unit is an electromagnet, the electromagnet being arranged on an outer wall of the detection channel, and the collecting and releasing part being an iron core of the electromagnet, the iron core being arranged in the detection channel. The engine lubricating oil abrasive particle detection device comprises the following steps. The abrasive particle collecting and releasing device is used to intercept the abrasive particles in the detection channel. After the first set time, the abrasive particles intercepted by the abrasive particle collecting and releasing device are released. From the time when the abrasive particles are released, the detection unit obtains an index real value according to the number of the abrasive particles within the second set time.

2. The engine oil wear debris detection apparatus of claim 1, wherein The index real value is compared with an abnormal alarm threshold value to determine whether the lubricating oil abrasive particles exceed the standard. ​ 3. The engine oil wear debris detection apparatus of claim 2, wherein, ​ 4. A method of detecting engine oil wear particles, characterized by, ​ ​ ​ ​ ​

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