Vane type lubricating oil flow and abrasive particle monitoring composite sensor

Abstract

The invention relates to the field of lubricating oil abrasive particle monitoring, in particular to a blade type lubricating oil flow and abrasive particle monitoring composite sensor which comprises a shell, an insulating bush is arranged in the shell, a plurality of detection electrodes are arranged in the insulating bush, and a plurality of insulating rings are arranged between every two detection electrodes. A flow impeller is arranged on one side of one detection electrode, a positioning sleeve is arranged on one side of the flow impeller, each detection electrode comprises an outer ring and a plurality of blades arranged in the outer ring, and a positioning sleeve is arranged on one side of the flow impeller. The distance between the blades is small, the detection precision is improved, the distance between the blades can be changed at will, and therefore the structural adaptability is high.

Description

Technical Field

[0001] The present invention relates to the field of lubricating oil abrasive monitoring, and particularly to a vane-type composite sensor for monitoring lubricating oil flow rate and abrasives. Background Art

[0002] The engine is a key component of transportation vehicles such as airplanes, automobiles, and ships, and its working performance is of great significance to the safety and reliability of driving. The lubricating oil system is one of the important component systems of the engine. The lubricating oil mainly flows through frequently worn areas such as the bearings and gears of the engine. In addition to the functions of lubrication and cooling, it can also be used as a transport medium for abrasives. Especially in aeroengines, the abrasives generated by wear contain important information about the wear condition of rotating components. Therefore, monitoring the abrasives in the lubricating oil is an effective method for diagnosing potential faults of aeroengines. At present, the lubricating oil abrasive monitoring methods at home and abroad are divided into offline detection and online detection. Offline detection requires extracting the lubricating oil from the engine and then performing detection. It includes methods such as ferrography, spectroscopy, and magnetic plug analysis. Although such methods have high detection accuracy and are not affected by harsh working environments, they highly rely on expensive detection equipment and the detection experience of detection personnel, have a long detection time, and do not have real-time performance. Online detection can collect abrasive data in real time to monitor the working state of the engine in real time. The methods capable of online monitoring include optical method, electromagnetic method, acoustic method, and energy method, etc. Among them, the electromagnetic method is widely used because of its low cost and simple and direct method. Abrasives have electromagnetic properties such as magnetism, magnetic permeability, and dielectric constant. According to these properties of abrasives, the electromagnetic detection methods can be divided into magnetic induction type, inductance type, capacitance type, resistance type, and charge type abrasive detection methods. Among them, the capacitive sensor is widely used because of its advantages such as low cost, simple structure, and high accuracy.

[0003] To achieve high-resolution identification of abrasive particles and increase the electric field strength, the electrode spacing of the capacitive sensor needs to be as small as possible. The coaxial capacitive sensor features placing a rod-shaped electrode in the center of the lubricating oil flow channel as the inner core, with the annular electrode being the existing wall of the lubricating oil pipeline. The lubricating oil flows through the annular space between the annular electrode and the inner core. This design reduces the electrode spacing to less than half of the normal diameter of the lubricating oil pipeline. However, its drawback is that its sensitivity is still relatively low, and the detection accuracy mainly depends on the size of the lubricating oil flow channel, so it is vulnerable to influence in practical applications. The microfluidic chip capacitive sensor is characterized by making tiny electrodes surrounding a circular hole on a PCB board. When using the casting method to make the chip, the PCB board is placed in the colloid and drilled to form a microfluidic chip. This sensor can reduce the cross-sectional diameter of the lubricating oil flow channel to within 800 microns and has high detection accuracy. However, its drawback is that due to the extremely narrow flow channel diameter, the lubricating oil can only flow by means of a micro-injection pump, so the lubricating oil passability is severely insufficient, and the sensor structure is very complex, not suitable for on-line monitoring, but only for laboratory testing. The honeycomb capacitive sensor is characterized by punching circular holes in three circular planar electrodes and placing them perpendicular to the lubricating oil flow direction at equal intervals in parallel within the lubricating oil pipeline to form two equivalent capacitors. This sensor can arbitrarily change the electrode spacing, and the detection accuracy is relatively ideal. However, its drawback is that the three planar electrodes placed perpendicular to the lubricating oil flow direction result in a very large resistance to the flow of the lubricating oil, insufficient lubricating oil passability, and it is likely to affect the normal operation of the lubricating oil system. None of the above methods are suitable for on-line monitoring of the abrasive particles in the lubricating oil of an engine. Summary of the Invention

[0004] The purpose of the present invention is to provide a vane-type composite sensor for monitoring lubricating oil flow rate and abrasive particles to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A vane-type composite sensor for monitoring lubricating oil flow rate and abrasive particles includes a housing. An insulating bushing is arranged inside the housing. A plurality of detection electrodes are arranged inside the insulating bushing. A number of insulating rings are arranged between two detection electrodes. A flow impeller is arranged on one side of one of the detection electrodes. A positioning sleeve is arranged on one side of the flow impeller. The detection electrode includes an outer ring and a plurality of vanes arranged inside the outer ring. The vanes are obliquely arranged inside the outer ring. A positioning sleeve is arranged on one side of the flow impeller.

[0007] Preferably, the outer side of the positioning sleeve is threadedly connected to the inner wall of the insulating bushing. A guiding groove is arranged on the inner wall of the insulating bushing. A positioning block one is arranged on the outer side of the detection electrode. The positioning block one is slidably connected to the guiding groove.

[0008] Preferably, blades are spirally arranged inside the outer ring, and a second positioning block matching the guiding groove is arranged on the outer side of the outer ring.

[0009] Preferably, a first boss is arranged at one end of the positioning sleeve, and a first connecting groove matching the first boss is formed at one end of the flow impeller.

[0010] Preferably, second bosses are arranged on both sides of the outer ring, and second connecting grooves matching the second bosses are respectively formed at both ends of the insulating ring.

[0011] Preferably, a wire groove is formed inside the housing, and the detection electrode and the flow impeller are connected to an external host computer.

[0012] Preferably, positioning posts are arranged inside the insulating bushing, and the sizes of the positioning posts match the size of the outer ring.

[0013] Preferably, the flow impeller includes a mounting ring and a rotational speed sensor connected to the mounting ring. A rotating impeller is connected to one side of the rotational speed sensor. A third positioning block matching the guiding groove is arranged on the outer side of the mounting ring, and the rotational speed sensor is connected to an external host computer.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In the present invention, the flow impeller is placed in front of the electrode plate. After the lubricating oil passes through the flow impeller, rotation is generated, improving the fluidity of the lubricating oil between the detection electrodes, and abrasive particles are not easily attached to the pipe wall and the electrode plate.

[0016] 2. In the present invention, the blades have an angle with the lubricating oil pipe. Therefore, the distance between the blades is shorter than the distance between the axially arranged electrodes, greatly improving the detection accuracy. The distance between the blades can be changed arbitrarily, so the structural adaptability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of the structure of the present invention;

[0018] Figure 2 is a schematic top view of the structure of the present invention;

[0019] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction in

[0020] Figure 4 is a schematic diagram of the equivalent capacitance of the detection electrode of the present invention;

[0021] Figure 5 is a schematic diagram of the structure of the flow impeller of the present invention;

[0022] Figure 6 is a schematic diagram of the structure of the detection electrode of the present invention.

[0023] In the figure: housing 1, insulating bushing 2, detection electrode 3, insulating ring 4, flow impeller 5, positioning sleeve 6, outer ring 31, blade 32, mounting ring 51, rotational speed sensor 52, rotating impeller 53. Specific embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Please refer to Figures 1-6 , the present invention provides a technical solution: a vane type lubricating oil flow and abrasive particle monitoring composite sensor, including a housing 1, an insulating bushing 2, a detection electrode 3, an insulating ring 4, a flow impeller 5, and a positioning sleeve 6.

[0028] The insulating bushing 2 is installed inside the housing 1, the detection electrode 3 is installed inside the insulating bushing 2, several insulating rings 4 are installed between the two detection electrodes 3, a flow impeller 5 is installed on one side of a detection electrode 3, and a positioning sleeve 6 is installed on one side of the flow impeller 5. The detection electrode 3 includes an outer ring 31 and five vanes 32 installed inside the outer ring 31. The five vanes 32 are evenly inclined around the central axis of the outer ring 31. A positioning sleeve 6 is installed on one side of the flow impeller 5 inside the outer ring 31. One end of the insulating bushing 2 is provided with a first boss, and a connecting groove one for cooperating with the first boss is opened at one end of the flow impeller 5. A wire groove is opened on the inner side of the housing 1, and the detection electrode 3 and the flow impeller 5 are connected to an external host computer.

[0029] The outer side of the positioning sleeve 6 is threadedly connected to the inner wall of the insulating bushing 2. A guiding groove is installed on the inner wall of the insulating bushing 2. A first positioning block is installed on the outer side of the detection electrode 3, and the first positioning block is slidably connected to the guiding groove. A second positioning block for cooperating with the guiding groove is installed on the outer side of the outer ring 31. Two second bosses are provided on both sides of the outer ring 31, and connecting grooves two for cooperating with the second bosses are respectively opened at both ends of the insulating ring 4. A positioning column is installed inside the insulating bushing 2, and the size of the positioning column matches the size of the outer ring 31. The flow impeller 5 includes an installation ring 51 and a rotational speed sensor 52 connected to the installation ring 51. A rotational impeller 53 is connected to one side of the rotational speed sensor 52. A third positioning block for cooperating with the guiding groove is installed on the outer side of the installation ring 51, and the rotational speed sensor 52 is connected to an external host computer.

[0030] Working principle: Three detection electrodes 3 and two insulating rings 4 are installed in the present invention. First, the insulating bushing 2 is placed inside the housing 1, then the first detection electrode 3 is placed into the insulating bushing 2 and is clamped by the positioning column on the inner wall. Then the first insulating ring 4 is placed. After repeating this operation twice, the last detection electrode 3 is placed. Then the flow impeller 5 is placed in front of the last detection electrode 3. Finally, the threaded positioning sleeve 6 is placed into the insulating bushing 2 and rotated along the inner wall thread, moving towards the flow impeller 5 until it contacts the flow impeller 5. Finally, a wire passage is used for placing wires, and the external signal conditioning circuit is connected to multiple detection electrodes 3 and the flow impeller 5 through wires, and the installation can be completed.

[0031] The vanes 32 in multiple detection electrodes 3 can be regarded as electrodes. The vanes 32 of two adjacent detection electrodes 3 are in a parallel structure and can form an equivalent capacitor. When abrasive particles flow between the vanes 32 of the detection electrode 3, due to the difference in relative permittivity between the abrasive particles and the lubricating oil, the capacitance value between the vanes 32 will increase. As Figure 4 shown, compared with the axially arranged parallel electrodes, the distance d between the two parallel electrodes is longer than the distance d1 between the two parallel vanes (electrodes). Therefore, the measurement accuracy of the equivalent capacitance formed by the two vanes (electrodes) is higher.

[0032] By connecting to the signal conditioning circuit of the host computer, a DC pulse signal representing the capacitance change can be obtained. According to the magnitude and waveform of the pulse signal, the size and even the shape of the abrasive particles can be judged, realizing the monitoring of the working state of the aeroengine. In addition, the rotating impeller 53 in the flow impeller 5 will rotate when the lubricating oil flows through. By measuring the rotation speed of the rotating impeller 53 with the speed sensor 52, the flow rate of the lubricating oil can be obtained.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blade-type lubricating oil flow and wear particle monitoring composite sensor, comprising a housing (1), characterized in that: An insulating bushing (2) is arranged inside the housing (1), a plurality of detection electrodes (3) are arranged inside the insulating bushing (2), a plurality of insulating rings (4) are arranged between two detection electrodes (3), a flow impeller (5) is arranged on one side of one detection electrode (3), a positioning sleeve (6) is arranged on one side of the flow impeller (5), the detection electrode (3) comprises an outer ring (31) and a plurality of blades (32) arranged inside the outer ring (31), the blades (32) are arranged obliquely inside the outer ring (31), and a positioning sleeve (6) is arranged on one side of the flow impeller (5).

2. A blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 1, characterized in that: The outer side of the positioning sleeve (6) is threadedly connected to the inner wall of the insulating bushing (2), the inner wall of the insulating bushing (2) is provided with a guide groove, and the outer side of the detection electrode (3) is provided with a positioning block 1, and the positioning block 1 is slidably connected to the guide groove.

3. A blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 2, characterized in that: Five blades (32) are spirally arranged inside the outer ring (31), and a second positioning block cooperating with the guide groove is arranged on the outer side of the outer ring (31).

4. The blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 1, characterized in that: One end of the positioning sleeve (6) is provided with a boss 1, and one end of the flow impeller (5) is provided with a connecting groove 1 that matches the boss 1.

5. The blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 1, characterized in that: Two bosses are provided on both sides of the outer ring (31), and two connecting grooves cooperating with the two bosses are respectively provided on both ends of the insulating ring (4).

6. The blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 1, characterized in that: A wire groove is provided on the inner side of the housing (1), and the detection electrode (3) and the flow impeller (5) are connected to an external host computer.

7. The blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 1, characterized in that: A positioning column is arranged inside the insulating bushing (2), and the size of the positioning column matches the size of the outer ring (31).

8. The blade-type lubricating oil flow and wear particle monitoring composite sensor according to claim 2, characterized in that: The flow impeller (5) comprises a mounting ring (51) and a rotation speed sensor (52) connected to the mounting ring (51); one side of the rotation speed sensor (52) is connected to a rotating impeller (53); a positioning block three cooperating with a guide groove is arranged on the outer side of the mounting ring (51); and the rotation speed sensor (52) is connected to an external host computer.

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