CN111982984A - High-precision cross-capacitance oil detection sensor and detection method thereof - Google Patents

Abstract

The invention provides a high-precision cross capacitance oil detection sensor and a detection method thereof, wherein the detection method comprises the following steps: the device comprises a cross capacitor, a first circular copper guard ring, a second circular copper guard ring, a brass metal protective cover and an electrode connector; the cross capacitor comprises a first Teflon tube and four symmetrically arranged brass electrodes attached to the outer wall of the first Teflon tube, wherein the interval between any two brass electrodes is 0.5 mm; the first circular copper guard ring and the second circular copper guard ring are respectively arranged at the upper end and the lower end of the outer wall of the first Teflon tube, and are spaced from the two ends of the brass electrode by 0.5 mm; the brass metal protective cover is arranged outside the cross capacitor, the interval between the brass metal protective cover and the cross capacitor is 1mm, and a second Teflon tube is arranged between the brass metal protective cover and the cross capacitor; the electrode connector is connected with four identical brass electrodes. The technical problems of high detection cost, time consumption, single detection parameter, low detection precision and the like in the prior art are solved.

Description

A high-precision cross-capacitor oil detection sensor and its detection method

technical field

The invention relates to the technical field of fault detection of hydraulic systems of marine equipment, in particular, to a high-precision cross-capacitance oil detection sensor and a detection method thereof.

Background technique

All kinds of rotating machinery use lubricating oil to ensure their normal operation. Wear and tear is one of the most common failure forms that lead to abnormal operation and failure of various rotating machinery and equipment. During the wear and tear of rotating parts of mechanical equipment, different sizes and shapes are produced. Metal particles can mix with lubricating oil and seriously impair the performance of machinery and equipment. Therefore, detection of such particles is necessary to predict and prevent catastrophic failure of machines. Detecting metal particles in oil is important to avoid rotating machinery failures. By monitoring the quality or nature of wear particles in the lubricating oil, the condition of the various parts of the machine in direct contact with the lubricating oil can be obtained. During normal operation, the particle size and its concentration do not cause machine failure. When anomalies occur, both the size and concentration of metal particles increase. Therefore, by continuously monitoring the metal particles in the lubricating oil, catastrophic failure of the machine can be avoided. The condition monitoring methods of lubricating oil include chemical method, induction method, ferrography method and optical method.

Among them, spectroscopy is a chemical method, which is an offline, expensive and time-consuming detection method. This detection method does not provide real-time monitoring of the oil. The induction method provides on-line monitoring, but can only be used to detect ferromagnetic particles. Non-ferromagnetic metal particles in oil cannot be detected. Optical methods provide real-time monitoring, but the opacity of the oil can limit detection accuracy. Accuracy is affected by the refractive index of the medium and the shape of the metal particles in the oil. In addition, this detection method can cause contamination of the oil.

SUMMARY OF THE INVENTION

According to the technical problems of high detection cost, time-consuming, single detection parameters, and low detection accuracy in the prior art proposed above, a high-precision cross-capacitance oil detection sensor and a detection method thereof are provided. Realize the detection of every trace impurity in lubricating oil.

The technical means adopted in the present invention are as follows:

A high-precision cross-capacitance oil detection sensor, comprising: a cross-capacitor, a first circular copper grommet, a second circular copper grommet, a brass metal protective cover, and an electrode connector;

The cross capacitor includes a first Teflon tube and four symmetrically arranged brass electrodes attached to the outer wall of the first Teflon tube, and the interval between any two brass electrodes is 0.5 mm;

The first circular copper grommet is arranged on the upper end of the outer wall of the first Teflon tube, and the interval between the first circular copper grommet and one end of the brass electrode is 0.5 mm; the second circular A round copper grommet is arranged at the lower end of the outer wall of the first Teflon tube, and the second round copper grommet is spaced 0.5mm from the other end of the brass electrode;

The brass metal protective cover is arranged outside the cross capacitor and is spaced 1mm from the cross capacitor, and a second Teflon is also arranged between the brass metal protective cover and the cross capacitor Tube;

The electrode connector connects four identical brass electrodes.

Further, the diameter of the second Teflon tube is larger than the diameter of the first Teflon tube.

Further, the lengths of the four brass electrodes are all 18mm, and the thicknesses are all 2mm.

Further, the lengths of the first circular copper grommet and the second circular copper grommet are both 5mm, and the thickness is the same as the thickness of the brass electrode, both 2mm.

Further, the outer diameter of the brass metal protective cover is 16mm, and the thickness is 1mm.

Further, polytetrafluoroethylene is filled between any two of the brass electrodes.

Further, the high-precision cross-capacitance oil detection sensor further includes a detection device, the detection device includes a base and a bracket fixedly connected to the base, and the bracket is respectively provided with a first clamping device and a second clamping device; the said The first clamping device is connected to the high-precision cross-capacitor oil detection sensor; the high-precision cross-capacitor oil detection sensor is electrically connected to the AD7150 capacitance-to-digital converter and the PC terminal; the second clamping device is connected to the third special The third Teflon tube passes through the center of the first Teflon tube, the top of the third Teflon tube is connected to the funnel, and the bottom end is provided with a container, and the connection between the container and the third Teflon tube is There is a filter in between.

Further, the diameter of the third Teflon tube is smaller than the diameter of the first Teflon tube.

The present invention also provides an oil detection method based on a high-precision cross-capacitance oil-liquid detection sensor. The method is realized by using the high-precision cross-capacitor oil-liquid detection sensor, and includes the following steps:

Step S1, transporting the oil to be detected into the third Teflon tube through the funnel;

Step S2, when the oil to be detected flows through the cross-capacitor, apply signal excitation to the opposite electrodes of the cross-capacitor, and the cross-capacitor generates different capacitance responses according to the quality, size and flow rate of the metal contaminants in the oil;

Step S3, using AD7150 capacitance-to-digital converter to measure the capacitance value of the high-precision cross-capacitance oil detection sensor, the AD7150 capacitance-to-digital converter is connected to the PC terminal, and the PC terminal performs online data collection.

Step S4, the detected oil flows into the container through the filter screen.

Compared with the prior art, the present invention has the following advantages:

In the high-precision cross-capacitance oil detection sensor provided by the invention, the capacitance value of the sensor will change due to the presence of metal particles in the oil, and the capacitance response of the sensor is very accurate. The sensor of the invention has the advantages of high speed, high precision, low cost and the like, and can detect metal particles in lubricating oil on-line quickly, accurately, at low cost and free of maintenance.

Based on the above reasons, the present invention can be widely applied in the fields of hydraulic system fault detection of marine equipment and the like.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of the sensor of the present invention.

FIG. 2 is a longitudinal sectional view of the sensor of the present invention.

FIG. 3 is a schematic structural diagram of a sensor and a detection device of the present invention.

Fig. 4 is a signal diagram obtained by the metal particles detected by the sensor of the present invention.

In the picture: 1. The first circular copper grommet; 2. The second circular copper grommet; 3. Brass metal shield; 4. Electrode connector; 5. The first Teflon tube; 6. Brass Electrode; 7. Second Teflon tube; 8. Base; 9. Bracket; 10. First clamping device; 11. Second clamping device; 12. High-precision cross capacitance oil detection sensor; 13. AD7150 capacitor Digital converter; 14, PC end; 15, third Teflon tube; 16, funnel; 17, container; 18, filter.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise. Meanwhile, it should be understood that, for convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that the orientations indicated by orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and these orientation words do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as a limitation on the scope of protection of the present invention: the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under its device or structure". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of the present invention.

As shown in Figures 1-2, the present invention provides a high-precision cross-capacitor oil detection sensor, including: a cross-capacitor, a first circular copper guard ring 1, a second circular copper guard ring 2, and a brass metal guard cover 3, electrode connector 4;

The cross capacitor includes a first Teflon tube 5 and four symmetrically arranged brass electrodes 6 attached to the outer wall of the first Teflon tube 5, and the interval between any two brass electrodes 6 is 0.5 mm; And between any two of the brass electrodes 6 is filled with polytetrafluoroethylene.

The first circular copper grommet 1 is arranged on the upper end of the outer wall of the first Teflon tube 5, and the interval between the first circular copper grommet 1 and one end of the brass electrode 6 is 0.5 mm; The second circular copper grommet 2 is arranged at the lower end of the outer wall of the first Teflon tube 5, and the interval between the second circular copper grommet 2 and the other end of the brass electrode 5 is 0.5 mm;

The brass metal protective cover 3 is arranged outside the cross capacitor, and is spaced 1 mm from the cross capacitor, and a second special feature is also provided between the brass metal protective cover 3 and the cross capacitor. Flon tube 7;

The electrode connector 4 connects four identical brass electrodes 6 .

As a preferred embodiment of the present invention, the diameter of the second Teflon tube 7 is larger than the diameter of the first Teflon tube 5 . In specific implementation, the diameter of the first Teflon tube 5 is 8 mm, and the diameter of the second Teflon tube 7 is 10 mm.

As a preferred embodiment of the present invention, the lengths of the four brass electrodes 6 are all 18 mm, and the thicknesses are all 2 mm.

As a preferred embodiment of the present invention, the length of the first circular copper grommet 1 and the second circular copper grommet 2 are both 5 mm, and the thickness is the same as the thickness of the brass electrode 6, both 2 mm.

As a preferred embodiment of the present invention, the outer diameter of the brass metal shield 3 is 16 mm, and the thickness is 1 mm. For shielding brass electrodes 6. The brass electrodes 6 of the crossover capacitor are insulated from the outer brass metal shield 3 by means of a second Teflon tube 7 with a thickness of 1 mm.

As shown in FIG. 3 , the high-precision cross-capacitance oil detection sensor further includes a detection device. The detection device includes a base 8 and a bracket 9 fixedly connected to the base 8 . The bracket 9 is provided with a first clamping device 10 and a second clamping device 10 respectively. The clamping device 11; the first clamping device 10 is connected to the high-precision cross-capacitor oil detection sensor 12; the high-precision cross-capacitor oil detection sensor 12 is electrically connected to the AD7150 capacitance-to-digital converter 13 and the PC terminal 14 ; The second clamping device 11 is connected to the third Teflon tube 15, the third Teflon tube 15 passes through the center of the first Teflon tube 5, and the top of the third Teflon tube 5 is connected to the funnel 16. A container 17 is provided just below the bottom end, and a filter screen 18 is suspended between the container 17 and the third Teflon tube 15.

As a preferred embodiment of the present invention, the diameter of the third Teflon tube 15 is smaller than the diameter of the first Teflon tube 5 .

The present invention also provides an oil detection method based on a high-precision cross-capacitor oil-liquid detection sensor. The method is implemented by using the high-precision cross-capacitor oil-liquid detection sensor, and includes the following steps:

Step S1, the oil to be detected is transported to the third Teflon tube 15 through the funnel 16;

Step S2, when the oil to be detected flows through the cross capacitor, apply signal excitation to the opposite brass electrodes 6 of the cross capacitor. capacitive response;

Step S3, using AD7150 capacitance-to-digital converter 13 to measure the capacitance value of the high-precision cross capacitance oil detection sensor, AD7150 capacitance-to-digital converter 13 is connected to PC terminal 14, and PC terminal 14 performs online data collection. The detected signal is shown in Figure 4.

Step S4 , the detected oil flows into the container 17 through the filter screen 18 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (9)

1. A high-precision cross capacitance oil detection sensor, characterized in that it comprises: a cross capacitor, a first circular copper grommet, a second circular copper grommet, a brass metal protective cover, and an electrode connector; The cross capacitor includes a first Teflon tube and four symmetrically arranged brass electrodes attached to the outer wall of the first Teflon tube, and the interval between any two brass electrodes is 0.5 mm; The first circular copper grommet is arranged on the upper end of the outer wall of the first Teflon tube, and the interval between the first circular copper grommet and one end of the brass electrode is 0.5 mm; the second circular A round copper grommet is arranged at the lower end of the outer wall of the first Teflon tube, and the second round copper grommet is spaced 0.5mm from the other end of the brass electrode; The brass metal protective cover is arranged outside the cross capacitor and is spaced 1mm from the cross capacitor, and a second Teflon is also arranged between the brass metal protective cover and the cross capacitor Tube; The electrode connector connects four identical brass electrodes. 2 . The high-precision cross-capacitance oil detection sensor according to claim 1 , wherein the diameter of the second Teflon tube is larger than the diameter of the first Teflon tube. 3 . 3 . The high-precision cross-capacitance oil detection sensor according to claim 1 , wherein the four brass electrodes have a length of 18 mm and a thickness of 2 mm. 4 . 4. The high-precision cross-capacitance oil detection sensor according to claim 1, wherein the length of the first circular copper grommet and the second circular copper grommet are both 5mm, and the thickness is the same as that of the yellow copper grommet. The thickness of the copper electrodes is the same as 2 mm. 5 . The high-precision cross-capacitance oil detection sensor according to claim 1 , wherein the brass metal protective cover has an outer diameter of 16 mm and a thickness of 1 mm. 6 . 6 . The high-precision cross-capacitance oil detection sensor according to claim 1 , wherein any two of the brass electrodes are filled with polytetrafluoroethylene. 7 . 7. The high-precision cross-capacitance oil detection sensor according to claim 1, further comprising a detection device, the detection device comprises a base and a bracket fixedly connected to the base, and the bracket is respectively provided with a first clamping device and the second clamping device; the first clamping device is connected to the high-precision cross-capacitor oil detection sensor; the high-precision cross-capacitor oil detection sensor is electrically connected to the AD7150 capacitance-to-digital converter and the PC terminal; the The second clamping device is connected to a third Teflon tube, the third Teflon tube passes through the center of the first Teflon tube, the top of the third Teflon tube is connected to a funnel, and a container is provided just below the bottom end, A filter screen is suspended between the container and the third Teflon tube. 8 . The high-precision cross-capacitance oil detection sensor according to claim 1 , wherein the diameter of the third Teflon tube is smaller than the diameter of the first Teflon tube. 9 . 9. An oil detection method based on a high-precision cross-capacitance oil-liquid detection sensor, characterized in that, the method is realized by utilizing the high-precision cross-capacitor oil-liquid detection sensor, comprising the following steps: Step S1, transporting the oil to be detected into the third Teflon tube through the funnel; Step S2, when the oil to be detected flows through the cross-capacitor, apply signal excitation to the opposite electrodes of the cross-capacitor, and the cross-capacitor generates different capacitance responses according to the quality, size and flow rate of the metal contaminants in the oil; Step S3, using AD7150 capacitance-to-digital converter to measure the capacitance value of the high-precision cross-capacitance oil detection sensor, the AD7150 capacitance-to-digital converter is connected to the PC terminal, and the PC terminal performs online data collection. Step S4, the detected oil flows into the container through the filter screen.

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