An engine oil wear particle on-line monitoring sensor, system and method

Abstract

The present application relates to the technical field of engine detection, and particularly relates to an engine lubricating oil abrasive particle online monitoring sensor, system and method, which comprises a shell and a capacitor plate assembled in the shell, the shell comprises a lubricating oil monitoring channel, a lubricating oil inlet and a lubricating oil outlet, the lubricating oil inlet extends to the inside of the lubricating oil monitoring channel to form a first isolation part near one end of the lubricating oil monitoring channel, and the first isolation part is sleeved on a support base and covers at least part of the exposed surface of the capacitor plate; thereby, through the first isolation part and a second isolation part, the non-parallel capacitor plate, the first arc-shaped capacitor plate and the second arc-shaped capacitor plate are completely isolated from the lubricating oil, effectively solving the problems of debonding and falling of the capacitor plate under the working condition of high-temperature and high-flow-rate lubricating oil, ensuring that the sensor can operate long-term and stably under the harsh working condition of lubricating oil temperature greater than 90 DEG C or lubricating oil flow rate greater than 3 m / s, and significantly improving the monitoring reliability and monitoring result accuracy of the sensor.

Description

Technical Field

[0001] This invention relates to the field of engine testing technology, and in particular to an online monitoring sensor, system and method for engine lubricating oil wear particles. Background Technology

[0002] The lubrication system is a crucial component of an engine, playing a key role in reducing friction and wear and extending the service life of various systems and components. Its performance varies with the operating conditions of the equipment. As the service life of rotating engine parts increases, friction and wear cause material loss from the surface of rotating parts, generating abrasive particles. These particles circulate in the lubrication system with the lubricating oil and contain a wealth of information about the wear process. Their quantity, size, shape, color, and morphology can comprehensively reflect the operating state of key components and the wear pattern of materials when abrasive particles are generated. By analyzing abrasive particles in the lubricating oil, it is beneficial to carry out timely and effective maintenance of rotating engine parts, avoid the adverse effects of secondary wear, and also understand the wear status of the engine.

[0003] For example, patent application CN118032019A discloses a series-parallel capacitive sensor and a method, medium, and device for online monitoring of lubricating oil abrasive particles. This method achieves synchronous monitoring of abrasive particles by connecting arc-shaped and non-parallel capacitive sensing parts in series. However, practical application and calculations have revealed that the sensor provided by this solution still has reliability deficiencies and cannot achieve continuous and stable abrasive particle monitoring.

[0004] It should be noted that the information disclosed in this background section is intended only to enhance the understanding of the overall background of the present invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the aforementioned technical problem of insufficient reliability in existing sensors, this invention provides an online monitoring sensor for engine lubricating oil abrasive particles. This sensor includes a housing and a capacitor plate assembled inside the housing. The housing contains a lubricating oil monitoring channel extending along an axis, and a lubricating oil inlet and outlet respectively sealed and assembled at both ends of the lubricating oil monitoring channel. The lubricating oil inlet, the lubricating oil monitoring channel, and the lubricating oil outlet together form a continuous lubricating oil flow path.

[0006] The lubricating oil monitoring channel is provided with a support base, which divides the interior of the lubricating oil monitoring channel into at least two independent monitoring sub-spaces. The capacitor plate is attached to the support base and at least covers part of the surface of the support base.

[0007] The lubricating oil inlet extends into the lubricating oil monitoring channel from one end to form a first isolation portion adapted to the support substrate. The first isolation portion is sleeved on the support substrate and at least covers a portion of the exposed surface of the capacitor plate.

[0008] On the other hand, the present invention also provides an online monitoring system for engine lubricating oil abrasive particles, which includes at least the above-mentioned online monitoring sensor for engine lubricating oil abrasive particles.

[0009] Thirdly, the present invention also provides an online monitoring method for engine lubricating oil abrasive particles, using the aforementioned online monitoring system for engine lubricating oil abrasive particles; the method includes at least the following steps: installing the online monitoring sensor for engine lubricating oil abrasive particles in the engine lubricating oil pipeline; when lubricating oil carrying abrasive particles enters the monitoring subspace through the lubricating oil inlet, extracting the capacitance signal of the capacitor plates through which the abrasive particles pass; and performing qualitative and quantitative analysis of the abrasive particles by analyzing the capacitance signal. Based on the above, the engine lubricating oil abrasive particle online detection sensor, system, and method provided by the present invention, compared with the prior art, achieves complete isolation between the non-parallel capacitor plate, the first arc-shaped capacitor plate, and the second arc-shaped capacitor plate and the lubricating oil through the first isolation part and the second isolation part. This effectively solves the problem of capacitor plate debonding and falling off under high temperature and high flow rate lubricating oil conditions, ensuring that the sensor can operate stably for a long time under harsh conditions such as lubricating oil temperature greater than 90°C or lubricating oil flow rate greater than 3m / s, and significantly improving the reliability of sensor monitoring and the accuracy of monitoring results. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships in the drawings described below are based on the direction in which the components are drawn in the figures.

[0011] Figure 1 This is a schematic diagram of the structure of an online monitoring sensor for engine lubricating oil wear particles provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of an online monitoring sensor for engine lubricating oil abrasive particles provided in an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of an online monitoring sensor for engine lubricating oil wear particles provided in an embodiment of the present invention. Figure 4This is a cross-sectional structural schematic diagram from another perspective of the online monitoring sensor for engine lubricating oil wear particles provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a lubricating oil monitoring channel provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the exploded structure of an oil inlet according to an embodiment of the present invention; Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 8 for Figure 6 Schematic diagram of the cross-sectional structure at point BB; Figure 9 This is a schematic diagram of the structure of a lubricating oil outlet according to an embodiment of the present invention; Figure 10 for Figure 1 Schematic diagram of the cross-sectional structure at the CC point; Figure 11 for Figure 9 Schematic diagram of the cross-sectional structure at point DD; Figure 12 , Figure 13 The figure shows a simplified schematic diagram of a copper electrode (not specifically marked, only schematic structure) and a non-parallel capacitance detection space and an arc-shaped capacitance detection space, provided in an embodiment of the present invention.

[0012] Figure label: 10-Outer shell, 11-Lubricating oil monitoring channel, 111-Monitoring subspace, 12-Lubricating oil inlet, 121-Second tenon, 13-Lubricating oil outlet, 131-Third tenon, 20-Capacitor plate, 21-Non-parallel capacitor plate, 22-First arc-shaped capacitor plate, 23-Second arc-shaped capacitor plate, 30-Supporting substrate, 31-First substrate, 32-Second substrate, 33-Third substrate, 34-First tenon, 35-First mortise, 36-Second mortise, 37-Third mortise, 40-Lead hole, 50-First isolation section, 60-Second isolation section Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof mean "at least comprising."

[0014] First, it should be noted that the applicant previously filed a patent application with publication number CN118032019A, which claimed protection for a series-parallel capacitive sensor, specifically through a series connection of an arc-shaped capacitive sensing part and a non-parallel capacitive sensing part to achieve synchronous monitoring of abrasive particles.

[0015] However, after long-term testing and actual use by the applicant, it was found that the structure has a reliability defect: in this structure, both the arc-shaped capacitor sensing part and the non-parallel capacitor sensing part are in direct contact with the engine lubricating oil. After the engine runs continuously, the arc-shaped capacitor sensing part and the non-parallel capacitor sensing part are prone to debonding and falling off under the influence of oil.

[0016] Most existing adhesives (such as epoxy resins, polyurethanes, and silicones) have a glass transition temperature (Tg). When the operating temperature approaches or exceeds Tg, the adhesive changes from a hard "glassy state" to a soft "elastic state," causing a sharp decrease in its bond strength and modulus, making it prone to creep and failure. Even at temperatures below Tg, prolonged exposure to high temperatures will cause the adhesive to undergo thermo-oxidative aging, leading to molecular chain breakage, changes in cross-linking, and ultimately, brittleness or stickiness, resulting in a loss of adhesive ability.

[0017] Meanwhile, the coefficients of thermal expansion (CTE) among the capacitor plates, mounting carrier, and adhesive in the sensor structure differ significantly. Temperature cyclically changes during device start-up, shutdown, or power fluctuations. Due to the CTE mismatch, the different expansion and contraction rates of the components generate substantial thermal stress at the bonding interface. This cyclic stress is the direct cause of interface fatigue, microcracks, and eventual debonding.

[0018] While high flow rates do not directly cause deadhesion, they do introduce two problems: Fluid shear force: generates a continuous peeling force on the surface of the adhesive layer that has been softened due to swelling or high temperature.

[0019] Exacerbating cavitation and abrasive erosion: If the lubricating oil contains air bubbles or abrasive particles, the high flow rate will create cavitation and abrasive wear, directly physically eroding the bonding interface and providing a channel for further oil penetration, forming a vicious cycle.

[0020] Extensive research by the applicant revealed that when the engine oil temperature exceeds 90°C or the oil flow rate exceeds 3 m / s, the probability of debonding or detachment of the arc-shaped capacitive sensing part and the non-parallel capacitive sensing part of the sensor in the above-mentioned scheme increases significantly, ultimately affecting the accuracy of monitoring and the reliability of the sensor.

[0021] To address the technical problem of insufficient reliability of existing sensor structures when the lubricating oil temperature is greater than 90°C or the lubricating oil flow rate is greater than 3m / s, or to achieve at least one or more of the aforementioned advantages, an embodiment of the present invention provides an online monitoring sensor for engine lubricating oil abrasive particles.

[0022] As shown in the figure, the engine lubricating oil wear particle online monitoring sensor includes a housing and a capacitor plate assembled inside the housing. The housing includes a lubricating oil monitoring channel that runs through the axis, and a lubricating oil inlet and a lubricating oil outlet that are respectively sealed and assembled at both ends of the lubricating oil monitoring channel. The lubricating oil inlet, the lubricating oil monitoring channel and the lubricating oil outlet together form a continuous lubricating oil flow path.

[0023] The lubricating oil monitoring channel is provided with a support base, which divides the interior of the lubricating oil monitoring channel into at least two independent monitoring sub-spaces. The capacitor plate is attached to the support base and at least covers part of the surface of the support base.

[0024] The lubricating oil inlet extends into the lubricating oil monitoring channel from one end to form a first isolation portion adapted to the support substrate. The first isolation portion is sleeved on the support substrate and at least covers a portion of the exposed surface of the capacitor plate.

[0025] Furthermore, the support substrate includes a first substrate integrally formed with the lubricating oil monitoring channel, and a second substrate and a third substrate respectively assembled at both ends of the first substrate, wherein the capacitor plates are attached to the outer surfaces of the second substrate and the third substrate.

[0026] Both ends of the first base are provided with a first tenon protruding along the axis. The second base and the third base are respectively provided with a first mortise adapted to the first tenon at one end and the third base respectively at one end of the first base. When the second base and the third base are assembled in the lubricating oil monitoring channel, the first tenon is embedded in the first mortise, realizing the coaxial fixed assembly of the first base, the second base and the third base.

[0027] Furthermore, the lubricating oil inlet is provided with a second tenon at one end near the lubricating oil monitoring channel, and the second base is provided with a second mortise at one end near the lubricating oil inlet that matches the second tenon; the lubricating oil outlet is provided with a third tenon at one end near the lubricating oil monitoring channel, and the third base is provided with a third mortise at one end near the lubricating oil outlet that matches the third tenon.

[0028] When the lubricating oil inlet and the lubricating oil outlet are respectively assembled at both ends of the lubricating oil monitoring channel, the second tenon is embedded in the second mortise and the third tenon is embedded in the third mortise to achieve coaxial fixed assembly of the lubricating oil inlet, the second base, the first base, the third base and the lubricating oil outlet.

[0029] Furthermore, the capacitor plate includes a non-parallel capacitor plate and a first arc-shaped capacitor plate. The non-parallel capacitor plate is attached to the surface of the second substrate, and the first arc-shaped capacitor plate is attached to the surface of the third substrate. The first isolation portion is adapted to the second substrate, and the axial length of the first isolation portion is not less than the axial length of the non-parallel capacitor plate, so as to completely cover the exposed surface of the non-parallel capacitor plate.

[0030] Furthermore, one end of the lubricating oil outlet near the lubricating oil monitoring channel extends into the lubricating oil monitoring channel to form a second isolation portion adapted to the third substrate. The second isolation portion is sleeved on the third substrate and completely covers the first arc-shaped capacitor plate.

[0031] Furthermore, the first isolation portion and the second isolation portion are made of non-conductive material.

[0032] Furthermore, the capacitor plate also includes a second arc-shaped capacitor plate, which is sleeved on the side surface of the second isolation portion away from the third substrate. The axial length of the second arc-shaped capacitor plate is not greater than the axial length of the second isolation portion, so that the second isolation portion completely covers the second arc-shaped capacitor plate.

[0033] Furthermore, the non-parallel capacitor plates, the first arc-shaped capacitor plate, and the second arc-shaped capacitor plate are all integrated flexible printed circuit boards.

[0034] Furthermore, the present invention also provides an online monitoring system for engine lubricating oil abrasive particles, which includes at least the above-mentioned online monitoring sensor for engine lubricating oil abrasive particles.

[0035] Furthermore, the present invention also provides an online monitoring method for engine lubricating oil abrasive particles, using the aforementioned online monitoring system for engine lubricating oil abrasive particles. This method includes at least the following steps: installing the online monitoring sensor for engine lubricating oil abrasive particles in the engine lubricating oil pipeline; when lubricating oil carrying abrasive particles enters the monitoring subspace through the lubricating oil inlet; extracting the capacitance signal of the capacitor plates through which the abrasive particles pass; and performing qualitative and quantitative analysis of the abrasive particles by analyzing the capacitance signal.

[0036] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application and through various specific implementation methods.

[0037] Example 1 Please see Figures 1-4 , Figure 1 This is a schematic diagram of the structure of an online monitoring sensor for engine lubricating oil wear particles provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of an online monitoring sensor for engine lubricating oil abrasive particles provided in an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of an online monitoring sensor for engine lubricating oil wear particles provided in an embodiment of the present invention. Figure 4 This is a cross-sectional structural schematic diagram from another perspective of the online monitoring sensor for engine lubricating oil wear particles provided in an embodiment of the present invention.

[0038] As shown in the figure, the engine lubricating oil wear particle online monitoring sensor includes a housing 10 and a capacitor plate 20 assembled inside the housing 10. The housing 10 can be made of non-conductive materials such as PEEK and PPS, which have good high temperature resistance, oil resistance and mechanical strength.

[0039] Specifically, the housing 10 may include a lubricating oil monitoring channel 11 that runs through the entire axis, and a lubricating oil inlet 12 and a lubricating oil outlet 13 that are respectively sealed and assembled at both ends of the lubricating oil monitoring channel 11. The lubricating oil inlet 12, the lubricating oil monitoring channel 11 and the lubricating oil outlet 13 are sealed and assembled in sequence to form a continuous lubricating oil flow path.

[0040] Please combine Figure 3 , Figure 4 See Figure 5As shown in the figure, a support base 30 is provided inside the lubricating oil monitoring channel 11. The support base 30 divides the interior of the lubricating oil monitoring channel 11 into at least two independent monitoring subspaces 111. In this embodiment, four subspaces are preferred, that is, the interior of the lubricating oil monitoring channel 11 is evenly divided into four independent monitoring subspaces 111.

[0041] The supporting substrate 30 can be made of the same or different material as the outer shell 10, as long as it is a non-conductive material with good high temperature resistance, oil resistance and mechanical strength. This case does not impose any restrictions on this.

[0042] In a specific implementation, the support base 30 includes a first base 31, and a second base 32 and a third base 33 respectively assembled at both ends of the first base 31. The first base 31 can be integrally formed with the lubricating oil monitoring channel 11, and its central axis coincides with the central axis of the lubricating oil monitoring channel 11.

[0043] Both ends of the first base 31 are provided with first tenons 34 protruding axially. Preferably, the cross-section of the first tenon 34 can be a triangular, quadrilateral, or polygonal structure, which can effectively transmit torque, and the second body 32 and the third base 33 rotate relative to the first base 31 after assembly. The end of the second base 32 adjacent to the first base 31 and the end of the third base 33 adjacent to the first base 31 are respectively provided with first mortises 35 that are adapted to the first tenons 34, and the depth of the first mortises 35 can be equal to the height of the first tenons 34.

[0044] When the second base 32 and the third base 33 are assembled in the lubricating oil monitoring channel 11, the first tenon 34 is fully embedded in the first mortise 35, realizing the initial positioning and fixing of the first base 31, the second base 32 and the third base 33, and making the central axes of the three coincide. This modular design facilitates the subsequent assembly and maintenance of the capacitor plate 20.

[0045] Preferably, to further enhance the connection strength and sealing performance, high-temperature resistant epoxy adhesive can be applied to the joint between the first tenon 34 and the first mortise 35 to ensure a stable and reliable connection between the first substrate 31, the second substrate 32, and the third substrate 33 under high temperature and high flow rate lubricating oil conditions.

[0046] like Figures 6-8 As shown, the lubricating oil inlet 12 is provided with a second tenon 121 at one end near the lubricating oil monitoring channel 11, and the second base 32 is provided with a second mortise 36 that matches the second tenon 121 at one end near the lubricating oil inlet 12.

[0047] like Figures 9-11As shown, the lubricating oil outlet 13 is provided with a third tenon 131 at one end near the lubricating oil monitoring channel 11, and the third base 33 is provided with a third mortise 37 that matches the third tenon 131 at one end near the lubricating oil outlet 13. The cross-sections of the second tenon 121 and the third tenon 131 can also be triangular, quadrilateral, or polygonal structures, which can effectively transmit torque and avoid relative rotation.

[0048] When the lubricating oil inlet 12 and the lubricating oil outlet 13 are respectively assembled at both ends of the lubricating oil monitoring channel 11, the second tenon 121 is embedded in the second mortise 36 and the third tenon 131 is embedded in the third mortise 37, so as to achieve coaxial fixed assembly between the lubricating oil inlet 12, the second base 32, the first base 31, the third base 33 and the lubricating oil outlet 13, to ensure the coaxiality of the lubricating oil flow path, reduce the retention of abrasive particles in the channel, and at the same time improve the rigidity and stability of the overall sensor structure.

[0049] The capacitor plate 20 is attached to the support substrate 30 and at least covers a portion of the surface of the support substrate 30. Specifically, the capacitor plate 20 may include a non-parallel capacitor plate 21, a first arc-shaped capacitor plate 22, and a second arc-shaped capacitor plate 23. Preferably, the non-parallel capacitor plate 21, the first arc-shaped capacitor plate 22, and the second arc-shaped capacitor plate 23 may be integrated flexible printed circuit boards (FPCs) to improve integration, reduce the number of leads, and lower assembly difficulty and signal interference risk.

[0050] The non-parallel capacitor plate 21 and the first arc-shaped capacitor plate 22 can be attached to the outer surfaces of the second substrate 32 and the third substrate 33 respectively using high-temperature resistant pressure-sensitive adhesive. During the attachment process, a vacuum adsorption process can be used to ensure a tight fit between the plate and the substrate surface, eliminating air bubbles and improving the adhesion of the non-parallel capacitor plate 21 and the first arc-shaped capacitor plate 22. The second arc-shaped capacitor plate 23 is located on the side of the first arc-shaped capacitor plate 22 away from the third substrate 33, forming an inner and outer double-layer arc-shaped electrode structure together with the first arc-shaped capacitor plate 22.

[0051] by Figure 12 , Figure 13 For example, in this embodiment, the non-parallel capacitor plate 21, the first arc-shaped capacitor plate 22, and the second arc-shaped capacitor plate 23 are preferably designed with several copper electrodes covered by a polyimide film.

[0052] Two copper electrodes on the non-parallel capacitor plate 21, located within the same monitoring subspace 111, form a non-parallel capacitance detection space. Two copper electrodes on the first arc-shaped capacitor plate 22 and the second arc-shaped capacitor plate 23, located within the same monitoring subspace 111, form an arc-shaped capacitance detection space. The non-parallel capacitance detection space and the arc-shaped capacitance detection space within the same monitoring subspace 111 are connected axially. Preferably, the sidewall of the lubricating oil monitoring channel 11 may have a lead hole 40 to facilitate the lead wires from the non-parallel capacitor plate 21 and the first arc-shaped capacitor plate 22.

[0053] In practical applications, the online engine oil wear particle monitoring sensor can be installed in the engine oil pipeline, allowing the engine oil to flow along the oil flow path. When wear particles carried in the oil enter the monitoring subspace 111, they change the dielectric constant of the medium between the capacitor plates 20, thus causing a change in the capacitance value. Qualitative and quantitative analysis of the wear particles can be achieved by analyzing this capacitance signal.

[0054] Based on the above, such as Figures 6-8 As shown, one end of the lubricating oil inlet 12 near the lubricating oil monitoring channel 11 extends into the lubricating oil monitoring channel 11 to form a first isolation portion 50 that is adapted to the size and shape of the second substrate 32. The first isolation portion 50 can also be made of non-conductive materials such as PEEK and PPS, which have good high temperature resistance, oil resistance and mechanical strength.

[0055] When the lubricating oil inlet 12 is assembled at one end of the lubricating oil monitoring channel 11, the first isolation part 50 is sleeved on the second base 32, and the axial length L1 of the first isolation part 50 is not less than the axial length L2 of the non-parallel capacitor plate 21, so that the first isolation part 50 can completely cover the exposed surface of the non-parallel capacitor plate 21, completely isolating the non-parallel capacitor plate 21 from the lubricating oil flowing through the lubricating oil monitoring channel 11, and avoiding oil stains, delamination or other problems caused by the lubricating oil directly contacting the non-parallel capacitor plate 21.

[0056] Preferably, when the first isolation portion 50 covers the non-parallel capacitor plate 21, the fitting gap between the first isolation portion 50, the non-parallel capacitor plate 21, and the second substrate 32 is no greater than 0.3 mm.

[0057] like Figures 9-11 As shown, the end of the lubricating oil outlet 13 adjacent to the lubricating oil monitoring channel 11 extends into the lubricating oil monitoring channel 11 to form a second isolation part 60 that is adapted to the size and shape of the third substrate 33. The second isolation part 60 can also be made of non-conductive materials such as PEEK and PPS, which have good high temperature resistance, oil resistance and mechanical strength.

[0058] When the lubricating oil outlet 13 is assembled at one end of the lubricating oil monitoring channel 11, the second isolation part 60 is sleeved on the third substrate 33, and the axial length L3 of the second isolation part 60 is not less than the axial length L4 of the first arc-shaped capacitor plate 22, so that the second isolation part 60 can completely cover the exposed surface of the first arc-shaped capacitor plate 22, completely isolating the first arc-shaped capacitor plate 22 from the lubricating oil flowing through the lubricating oil monitoring channel 11, avoiding oil stains, detachment or other problems caused by the lubricating oil directly contacting the first arc-shaped capacitor plate 22.

[0059] Similarly, the axial length L5 of the second arc-shaped capacitor plate 23 is not greater than the axial length L3 of the second isolation part 60, so that the second isolation part 60 completely covers the second arc-shaped capacitor plate 23, completely isolating the second arc-shaped capacitor plate 23 from the lubricating oil flowing through the lubricating oil monitoring channel 11, and avoiding oil stains, delamination or other problems caused by the lubricating oil directly contacting the second arc-shaped capacitor plate 23.

[0060] Similarly, when the second isolation part 60 covers the first arc-shaped capacitor plate 22, the fitting gap between the second isolation part 60, the first arc-shaped capacitor plate 22, and the third substrate 33 is no greater than 0.3mm.

[0061] The first isolation section 50 and the second isolation section 60 achieve complete isolation between the non-parallel capacitor plate 21, the first arc-shaped capacitor plate 22 and the second arc-shaped capacitor plate 23 and the lubricating oil. This effectively solves the problem of capacitor plate debonding and falling off under high temperature and high flow rate lubricating oil conditions, ensuring that the engine lubricating oil abrasive particle online monitoring sensor can operate stably for a long time under harsh conditions such as lubricating oil temperature greater than 90℃ or lubricating oil flow rate greater than 3m / s, and significantly improving the sensor monitoring reliability and monitoring result accuracy.

[0062] Example 2 This embodiment provides an online monitoring system for engine lubricating oil wear particles, which includes at least the online monitoring sensor for engine lubricating oil wear particles described in the above embodiment.

[0063] Furthermore, this embodiment also provides an online monitoring method for engine lubricating oil wear particles, which uses the engine lubricating oil wear particle online monitoring system described above for monitoring.

[0064] The method includes at least the following steps: installing an online monitoring sensor for abrasive particles in engine lubricating oil in the engine lubricating oil pipeline; when lubricating oil carrying abrasive particles enters the monitoring subspace 111 through the lubricating oil inlet, extracting the capacitance signal of the capacitor plate 20 through which the abrasive particles pass; and performing qualitative and quantitative analysis of the abrasive particles by analyzing the capacitance signal.

[0065] In summary, the engine lubricating oil abrasive particle online detection sensor, system, and method provided by this invention, compared with the prior art, achieves complete isolation between the non-parallel capacitor plates, the first arc-shaped capacitor plate, and the second arc-shaped capacitor plate and the lubricating oil through the first and second isolation parts. This effectively solves the problem of capacitor plate debonding and detachment under high temperature and high flow rate lubricating oil conditions, ensuring that the sensor can operate stably for a long time under harsh conditions such as lubricating oil temperature greater than 90℃ or lubricating oil flow rate greater than 3m / s, significantly improving the reliability of sensor monitoring and the accuracy of monitoring results.

[0066] Although this document frequently uses terms such as lubricating oil monitoring channel, support substrate, and capacitor plate, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0067] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of the present invention can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or the background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An online monitoring sensor for engine lubricating oil abrasive particles, comprising a housing and a capacitor plate assembled inside the housing, characterized in that: The housing includes a lubricating oil monitoring channel that runs through the entire axis, and a lubricating oil inlet and a lubricating oil outlet that are respectively sealed and assembled at both ends of the lubricating oil monitoring channel. The lubricating oil inlet, the lubricating oil monitoring channel and the lubricating oil outlet together form a continuous lubricating oil flow path. The lubricating oil monitoring channel is provided with a support base, which divides the interior of the lubricating oil monitoring channel into at least two independent monitoring subspaces. The capacitor plate is attached to the support base and at least covers part of the surface of the support base. The lubricating oil inlet extends into the lubricating oil monitoring channel from one end to form a first isolation portion adapted to the support substrate. The first isolation portion is sleeved on the support substrate and at least covers a portion of the exposed surface of the capacitor plate.

2. The engine lubricating oil wear particle online monitoring sensor according to claim 1, characterized in that: The support substrate includes a first substrate integrally formed with the lubricating oil monitoring channel, and a second substrate and a third substrate respectively assembled at both ends of the first substrate. The capacitor plates are attached to the outer surfaces of the second substrate and the third substrate. Both ends of the first base are provided with a first tenon protruding along the axis. The second base and the third base are respectively provided with a first mortise adapted to the first tenon at one end and the third base respectively at one end of the first base. When the second base and the third base are assembled in the lubricating oil monitoring channel, the first tenon is embedded in the first mortise, realizing the coaxial fixed assembly of the first base, the second base and the third base.

3. The engine lubricating oil wear particle online monitoring sensor according to claim 2, characterized in that: The lubricating oil inlet is provided with a second tenon at one end near the lubricating oil monitoring channel, and the second base is provided with a second mortise at one end near the lubricating oil inlet that matches the second tenon; the lubricating oil outlet is provided with a third tenon at one end near the lubricating oil monitoring channel, and the third base is provided with a third mortise at one end near the lubricating oil outlet that matches the third tenon; When the lubricating oil inlet and the lubricating oil outlet are respectively assembled at both ends of the lubricating oil monitoring channel, the second tenon is embedded in the second mortise and the third tenon is embedded in the third mortise to achieve coaxial fixed assembly of the lubricating oil inlet, the second base, the first base, the third base and the lubricating oil outlet.

4. The engine lubricating oil wear particle online monitoring sensor according to claim 2, characterized in that: The capacitor plate includes a non-parallel capacitor plate and a first arc-shaped capacitor plate. The non-parallel capacitor plate is attached to the surface of the second substrate, and the first arc-shaped capacitor plate is attached to the surface of the third substrate. The first isolation portion is adapted to the second substrate, and the axial length of the first isolation portion is not less than the axial length of the non-parallel capacitor plate, so as to completely cover the exposed surface of the non-parallel capacitor plate.

5. The engine lubricating oil abrasive particle online monitoring sensor according to claim 4, characterized in that: The end of the lubricating oil outlet near the lubricating oil monitoring channel extends into the lubricating oil monitoring channel to form a second isolation part adapted to the third substrate. The second isolation part is sleeved on the third substrate and completely covers the first arc-shaped capacitor plate.

6. The engine lubricating oil wear particle online monitoring sensor according to claim 5, characterized in that: The first isolation portion and the second isolation portion are made of non-conductive material.

7. The engine lubricating oil wear particle online monitoring sensor according to claim 4, characterized in that: The capacitor plate further includes a second arc-shaped capacitor plate, which is sleeved on the side surface of the second isolation portion away from the third substrate. The axial length of the second arc-shaped capacitor plate is not greater than the axial length of the second isolation portion, so that the second isolation portion completely covers the second arc-shaped capacitor plate.

8. The engine lubricating oil abrasive particle online monitoring sensor according to claim 7, characterized in that: The non-parallel capacitor plates, the first arc-shaped capacitor plate, and the second arc-shaped capacitor plate are all integrated flexible printed circuit boards.

9. An online monitoring system for engine lubricating oil abrasive particles, characterized in that: It includes at least the engine lubricating oil wear particle online monitoring sensor as described in any one of claims 1-8.

10. A method for online monitoring of abrasive particles in engine lubricating oil, characterized in that: The engine lubricating oil wear particles are monitored using the online monitoring system as described in claim 9; The method includes at least the following steps: installing the engine lubricating oil abrasive particle online monitoring sensor in the engine lubricating oil pipeline; when lubricating oil carrying abrasive particles enters the monitoring subspace through the lubricating oil inlet, extracting the capacitance signal of the capacitor plate through which the abrasive particles pass; and realizing qualitative and quantitative analysis of the abrasive particles by analyzing the capacitance signal.

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