JP2022120762A - Inductance-capacitance two-passage oil liquid detector using high-permeability material - Google Patents

Abstract

To provide an inductance-capacitance two-passage oil liquid detector using a high-permeability material.SOLUTION: There is provided an inductance-capacitance two-passage oil liquid detector using a high-permeability material in which a first dovetail groove is opened in a first high-permeability alloy and a second dovetail groove is opened in a second high-permeability alloy. The accuracy of detection in a capacitance detection mode is increased by increasing the intensity of a magnetic field by using one pair of high-permeability alloys for a detection unit, designing the openings in flow passages of the high-permeability alloys as a dovetail groove structure to collect magnetic fields, and forming a high-intensity collected magnetic field not to increase the accuracy of detection but to use the high-permeability alloys as capacitance pole plates for detecting a capacitance.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to the technical field of fluid system fault detection, and more particularly to an inductance-capacitance two-pass fluid detection device, especially with high magnetic permeability materials.

The solid particles in the mechanical system fluid contain a wealth of tribological information, including composition, shape, size, quantity, etc. These information can reflect the operating conditions of the equipment, It plays a very important role in determining the type, degree of wear and degree of corrosion. By analyzing the tribological information of worn particles and timely replacing the mechanism where abnormal wear occurs and the contaminated oil, more serious losses can be avoided.

Conventional oil detection techniques can be classified into two types: off-line detection and on-line detection. Off-line detection is to submit the oil sample to the laboratory for detection, which involves many detection processes, a long submission detection cycle, and poor aging. In addition, online detection is mainly divided into ultrasonic detection method, optical detection method, inductance detection method and capacitance detection method. The ultrasonic detection method can distinguish between metal particles and air bubbles, but it cannot distinguish between ferromagnetic and non-ferromagnetic particles, and can be greatly affected by environmental factors such as external temperature and noise. However, the detection result is easily affected by the clarity and permeability of the oil liquid, the inductance detection method can distinguish between ferromagnetic particles and non-ferromagnetic particles, but the detection accuracy is low, and the conventional capacitance detection method Water droplets and air bubbles in the oil to be detected can be distinguished by the dielectric constant between them, but metal particles cannot be distinguished and detected.

SUMMARY OF THE INVENTION The present invention provides an inductance-capacitance two-pass oil detection device using high magnetic permeability material in view of the above technical problems of the limited detection accuracy of conventional oil detection sensors. The device of the present invention uses a pair of high-permeability alloys in the detection unit to increase the magnetic field strength, and the openings in the high-permeability alloy channels are designed as dovetail structures to gather the magnetic fields, It not only forms a high-intensity collective magnetic field to improve the detection accuracy, but also uses the high magnetic permeability alloy as the capacitance pole plate of the capacitance detection to improve the detection accuracy of the capacitance detection mode.

The technical means adopted by the present invention are as follows.
An inductance-capacitance two-pass oil liquid detection device using a high magnetic permeability material, which is one aspect of the present invention, comprises an excitation/collection unit and a detection unit connected to the excitation/collection unit by an insulated wire. - A capacitance two-passage fluid detection device,
The detection unit includes a capacitance detection unit including a capacitance detection channel, a left electrode and a right electrode arranged to face each other on both sides of the capacitance detection channel, an inductance detection channel, a first planar coil, and a second planar coil. , an inductance detection unit comprising a first high-permeability alloy and a second high-permeability alloy,
The first planar coil includes a first bonding surface and a first non-bonding surface, the second planar coil includes a second bonding surface and a second non-bonding surface, the first bonding surface being closely spaced from the second bonding surface. affixed to the bonding surface, the first non-laminating surface is tightly adhered to the first high-permeability alloy, the second non-laminating surface is tightly adhered to the second high-permeability alloy, and the first A first dovetail groove is formed in the high-permeability alloy, a second dovetail groove is formed in the second high-permeability alloy, and the inductance detection flow path includes the first planar coil, the second planar coil, the first dovetail groove, and the second dovetail groove. It penetrates the dovetail groove,
The left and right electrodes of the capacitance detection unit are respectively connected to the positive and negative electrodes of the excitation and collection unit by insulated wires, and the lead wires at both ends of the first planar coil and the second planar coil of the inductance detection unit are insulated wires. are respectively connected to the positive and negative poles of the excitation and acquisition unit to form a detection excitation and data acquisition circuit.

Furthermore, the minimum slit portions of the first dovetail groove and the second dovetail groove are all in contact with the inductance detection channel.

one end of the capacitance detection channel is connected to one end of the inductance detection channel, the connection port is a passage inlet, the other end of the capacitance detection channel is connected to the other end of the inductance detection channel, A connection port is a passage outlet.

Further, the capacitance detection unit further includes an electrode fixing bracket for fixing the left electrode and the right electrode, and the inductance detection unit further includes a first planar coil, a second planar coil, a first high permeability alloy and a second planar coil. Includes a coil fixing bracket for fixing the high permeability alloy.

Further, the inductance-capacitance two-pass oil liquid detection device with high magnetic permeability material further includes a PDMS base in which the detection unit is fixed.

Furthermore, the inner diameters of the capacitance detection channel and the inductance detection channel are both 300 micrometers.

Further, the first planar coil and the second planar coil are both wound with enameled wire, the single planar coil is wound in three layers, the coil diameter is 70 micrometers, the coil inner diameter is 300 micrometers, and the number of turns is 120 volumes.

Further, the materials of the left electrode and the right electrode include permalloy, silicon steel plate and magnetic nanoparticles.

Further, the first high-permeability alloy and the second high-permeability alloy include permalloy, silicon steel plate, and magnetic nanomaterials.

Furthermore, the excitation and collection unit is an impedance analyzer, which excites the capacitance detection unit and the inductance detection unit with a high frequency alternating current of 2V, 2MHz.

Compared with the prior art, the present invention has the following advantages.
In the inductance-capacitance two-passage liquid detection device using high magnetic permeability material according to the present invention, permalloy sheets are provided outside the coils facing each other on both sides of the microfluidic passage to gather the magnetic field in the detection area. This increases the magnetic field strength detected between the two planar coils, increases the detection accuracy of the inductance detection mode, can detect smaller metal particle contaminants, and uses highly conductive materials as capacitance plates. As a result, the capacitance detection capability is greatly increased, the signal-to-noise ratio of water droplets and air bubbles is increased, and the detection accuracy of water droplets and air bubbles in the oil is improved.

For the above reasons, the present invention can be widely used in fields such as failure detection of hydraulic systems.

In order to describe the embodiments of the present invention or the technical means in the prior art more clearly, the following briefly introduces the drawings that need to be used in the description of the embodiments or the prior art. These are just some examples, and it should be understood that those skilled in the art can derive other drawings based on these drawings without creative effort.

It is a block diagram of the detection apparatus of this invention. 1 is a configuration diagram of a capacitance detection unit of the present invention; FIG. 1 is a configuration diagram of an inductance detection unit of the present invention; FIG.

It should be noted that embodiments of the present invention and features in embodiments may be combined with each other unless inconsistent. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments with reference to the drawings.

In order to make the objects, technical means and advantages of the embodiments of the present invention clearer, the following clearly and completely describes the technical means of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, It goes without saying that the described embodiments are only some embodiments of the present invention rather than all embodiments. The following description of at least one exemplary embodiment is for the purpose of illustration only and in no way constitutes any limitation of the invention and its application or use. Other embodiments obtained by persons skilled in the art without creative efforts based on the embodiments in the present invention shall all fall within the scope of protection of the present invention.

Note that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit example embodiments according to the present invention. For example, unless the context clearly dictates otherwise, the singular forms used herein are intended to include the plural forms and the terms "including" and/or "including" are used herein. It should also be understood that at times features, steps, operations, devices, assemblies and/or combinations thereof are indicated.

Unless specifically stated otherwise, the relative arrangements of elements and steps, formulas and values described in these examples are not intended to limit the scope of the invention. Also, for convenience of explanation, it should be understood that the sizes of the parts shown in the drawings are not based on actual proportionality. A detailed discussion of techniques, methods and devices known to those skilled in the art may be omitted, but where appropriate, such techniques, methods and devices should be considered part of the authorized specification. In all examples shown and discussed herein, all specific values should be interpreted as illustrative rather than limiting. Accordingly, other instances of the illustrative embodiment may have different values. Note that similar symbols and letters indicate similar items in the following drawings, so that once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

In the description of the present invention, directions or positional relationships indicated by azimuth terms such as "front, rear, top, bottom, left, right", "horizontal, longitudinal, vertical, horizontal" and "top, bottom" generally refer to the drawings. , whose sole purpose is to facilitate description and simplify the description of the invention, and unless stated to the contrary, these azimuths do not necessarily identify the device or element shown. It should not be construed as limiting the scope of protection of the present invention, as it does not expressly or imply that it has the orientation of or is configured and operated in a particular orientation, and the azimuths "inside, out" refer to each It should be understood to refer to inside and outside of the contour of the member itself.

For convenience of explanation, the terms “above”, “above”, “of” are used herein, for example, to describe the spatial relationship between the devices or features shown in the figures and other devices or features. Spatial relative technical terms such as "top", "above" may be used. It should be understood that spatially relative technical terms are intended to include different orientations of use or operation of the device other than the orientation shown in the figures. For example, if the devices in the figures were reversed, a device described as "above another device or structure" or "above another device or structure" would then be referred to as "below another device or structure" or " "under other devices or structures". Thus, the exemplary terminology "above" can include two orientations, "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or positioned in other orientations) and the spatially relative descriptions used here interpreted accordingly.

It should be noted that the purpose of using terms such as "first" and "second" to define parts is to make it easier to distinguish corresponding parts, and unless otherwise specified, the above terms have no special meaning. Therefore, it should be explained that it should not be understood as limiting the scope of protection of the present invention.

As shown in FIG. 1, the inductance-capacitance oil contaminant synchronous detection device according to the present invention includes an excitation-collection unit 1 and a detection unit connected to the excitation-collection unit 1 by an insulated wire, the detection unit being a capacitance Including detection unit and inductance detection unit.

As shown in FIG. 2, the capacitance detection unit includes a capacitance detection channel 2, and a left electrode 3 and a right electrode 4 arranged to face each other on both sides of the capacitance detection channel 2, and specifically implements Sometimes, as a preferred embodiment of the present invention, the materials of left electrode 3 and right electrode 4 include permalloy, silicon steel plate and magnetic nanoparticles.

As shown in FIG. 3, the inductance detection unit includes an inductance detection channel 5, a first planar coil 6, a second planar coil 7, a first high permeability alloy 8 and a second high permeability alloy 9, the first plane The coil 6 includes a first bonding surface and a first non-bonding surface, and the second planar coil 7 includes a second bonding surface and a second non-bonding surface, the first bonding surface being tightly bound to the second bonding surface. The first non-bonding surface is tightly bonded to the first high permeability alloy 8, the second non-bonding surface is tightly bonded to the second high permeability alloy 9, and the second A first dovetail groove is formed in the first high-permeability alloy 8, a second dovetail groove is formed in the second high-permeability alloy 9, and the inductance detection flow path 5 is formed by the first planar coil 6, the second planar coil 7, and the second planar coil 7. It passes through the first dovetail groove and the second dovetail groove, and all of the minimum slit portions of the first and second dovetail grooves are in contact with the inductance detection channel 5 . Specifically, in the preferred embodiment of the present invention, the first high-permeability alloy 8 and the second high-permeability alloy 9 include permalloy, silicon steel plate, and magnetic nanomaterials. The magnetic field between the two planar coils can be enhanced by placing a high-permeability material closely attached to the coil, and the dovetail structure can concentrate the magnetic field, and the magnetic flux density is reduced at the point of the smallest slit. is the largest, and if this region is used as the detection region, the inductance signal-to-noise ratio can be increased, and the accuracy of the inductance type oil detection device can be improved.

In the specific implementation, as a preferred embodiment of the present invention, both the first planar coil 6 and the second planar coil 7 are wound with enameled wire, the single planar coil is wound with three layers, and the coil diameter is 70. In micrometers, the coil inner diameter is 300 micrometers and the number of turns is 120 turns. A spacing of 300 micrometers between two planar coils is the distance of one microfluidic passage.

Continuing to refer to FIG. 1 , one end of the capacitance detection channel 2 is connected to one end of the inductance detection channel 5 , the connection port is the passage inlet 10 , and the other end of the capacitance detection channel 2 is the inductance detection channel 5 . , and the connection port is the passage outlet 11 .

Continuing to refer to FIG. 1, in the specific implementation, as a preferred embodiment of the present invention, the capacitance detection unit further includes an electrode fixing bracket 12 for fixing the left electrode 3 and the right electrode 4, and an inductance detection unit. further includes a coil fixing bracket 13 for fixing the first planar coil 6 , the second planar coil 7 , the first high permeability alloy 8 and the second high permeability alloy 9 .

Continuing to refer to FIG. 1, in a specific implementation, as a preferred embodiment of the present invention, the two-passage oil-liquid detection device with high magnetic permeability material further includes a PDMS base 14 with a detection unit fixed therein.

Continuing to refer to FIG. 1, the left electrode 3 and the right electrode 4 of the capacitance detection unit are respectively connected to the positive and negative poles of the excitation and collection unit 1 by insulated wires, and the first planar coil 6 and the second planar coil 6 of the inductance detection unit. The lead wires at both ends of the planar coil 7 are respectively connected to the positive and negative poles of the excitation and acquisition unit 1 by insulated wires to form a circuit for detection excitation and data acquisition.

When specifically implemented, as a preferred embodiment of the present invention, the excitation/collection unit 1 is an impedance analyzer, which excites the capacitance detection unit and the inductance detection unit with a high-frequency alternating current of 2V, 2MHz. When a current flows through the series circuit, the two planar coils will form a magnetic field in the inductance detection path due to the edge effect, and this magnetic field region can be used to detect oil contaminants. The detection principle is as follows.

When the oil enters the detection device through the passage inlet 10, water droplets, bubble particles in the oil pass through the capacitance detection unit through the capacitance detection passage 2, the dielectric constant between the two plates is pure oil. Compared to liquid, the dielectric constant of air bubbles is smaller than that of hydraulic oil, and the dielectric constant of water is higher than that of hydraulic oil. bubbles and water droplets can be distinguished and detected.

When the oil enters the detection device through the passage inlet 10, the ferromagnetic particles and the non-ferromagnetic particles in the oil pass through the inductance detection passage 5 and pass through the inductance detection unit, the magnetization effect of the two particles. Due to the different eddy current effects, the directional inductance of ferromagnetic and non-ferromagnetic particles changes, which makes it possible to distinguish between ferromagnetic and non-ferromagnetic particles in hydraulic oil.

Finally, the following should be explained. The above embodiments are merely for explaining the technical means of the present invention, and are not intended to limit it. It is also possible to modify the technical means described in each embodiment, or to implement equivalent replacement for part or all of its technical features, and these modifications and replacements will change the essence of the corresponding technical means does not depart from the scope of technical means of each embodiment of the present invention.

(Appendix)
(Appendix 1)
An inductance-capacitance two-pass oil liquid detection device with high magnetic permeability material comprising an excitation-collection unit (1) and a detection unit connected to said excitation-collection unit (1) by an insulated conductor,
The detection unit is
a capacitance detection unit comprising a capacitance detection channel (2), a left electrode (3) and a right electrode (4) arranged to face each other on both sides of the capacitance detection channel (2);
an inductance detection unit comprising an inductance detection channel (5), a first planar coil (6), a second planar coil (7), a first high permeability alloy (8) and a second high permeability alloy (9); including
The first planar coil (6) includes a first bonding surface and a first non-bonding surface, the second planar coil (7) includes a second bonding surface and a second non-bonding surface, and includes a first bonding surface. The first non-laminated surface is closely adhered to the first high permeability alloy (8) and the second non-laminated surface is tightly adhered to the second high permeability alloy (8). Affixed to a magnetic permeability alloy (9), a first high permeability alloy (8) is provided with a first dovetail groove, a second high permeability alloy (9) is provided with a second dovetail groove, and an inductance detection channel. (5) penetrates the first planar coil (6), the second planar coil (7), the first dovetail groove and the second dovetail groove,
The left electrode (3) and right electrode (4) of the capacitance detection unit are respectively connected to the positive and negative electrodes of the excitation and collection unit by insulated wires, and the first planar coil (6) and the second planar coil of the inductance detection unit. High magnetic permeability, characterized in that the lead wires at both ends of the coil (7) are respectively connected to the positive and negative poles of the excitation and collection unit (1) by insulated wires, forming a detection excitation and data collection circuit. Material based inductance/capacitance two-pass fluid detection device.

(Appendix 2)
The inductance/capacitance two-passage oil-liquid detection device using a high magnetic permeability material according to appendix 1, characterized in that the minimum slit portions of the first dovetail groove and the second dovetail groove are all in contact with the inductance detection flow path (5). .

(Appendix 3)
One end of the capacitance detection channel (2) is connected to one end of the inductance detection channel (5), the connection port is the passage inlet (10), and the other end of the capacitance detection channel (2) is the inductance The inductance-capacitance two-passage liquid detection device by high magnetic permeability material according to appendix 1, characterized in that it is connected to the other end of the detection passage (5) and the connection port is the passage outlet (11).

(Appendix 4)
Said capacitance detection unit further comprises an electrode fixing bracket (12) for fixing said left electrode (3) and right electrode (4), said inductance detection unit further comprises a first planar coil (6), a second planar coil (7), a coil fixing bracket (13) for fixing the first high permeability alloy (8) and the second high permeability alloy (9). Material based inductance/capacitance two-pass fluid detection device.

(Appendix 5)
The inductance-capacitance two-pass oil liquid detection device by high magnetic permeability material according to claim 1, further comprising a PDMS base (14) in which said detection unit is fixed.

(Appendix 6)
Inductance/capacitance two-path oil liquid detection using a high magnetic permeability material according to appendix 1, characterized in that the inner diameters of the capacitance detection channel (2) and the inductance detection channel (5) are both 300 micrometers. Device.

(Appendix 7)
The first planar coil (6) and the second planar coil (7) are both wound with enameled wire, each single planar coil is wound in three layers, the coil diameter is 70 micrometers, and the coil inner diameter is 300 micrometers. , and the number of turns is 120.

(Appendix 8)
The inductance-capacitance two-pass oil detection device with high magnetic permeability material according to appendix 1, characterized in that the materials of the left electrode (3) and the right electrode (4) include permalloy, silicon steel plate, and magnetic nanoparticles. .

(Appendix 9)
Inductance capacitance by high magnetic permeability material according to Supplementary Note 1, characterized in that the first high magnetic permeability alloy (8) and the second high magnetic permeability alloy (9) include permalloy, silicon steel plate, magnetic nanomaterial. Two-pass oil liquid detection device.

(Appendix 10)
By high magnetic permeability material according to Supplementary note 1, characterized in that the excitation and collection unit (1) is an impedance analyzer, and the high frequency alternating current of 2V, 2MHz excites the capacitance detection unit and the inductance detection unit. Inductance/capacitance two-pass oil detection device.

REFERENCE SIGNS LIST 1 excitation/collection unit 2 capacitance detection channel 3 left electrode 4 right electrode 5 inductance detection channel 6 first planar coil 7 second planar coil 8 first high permeability alloy 9 second high permeability alloy 10 passage inlet 11 passage outlet 12 electrode fixation bracket 13 coil fixation bracket 14 PDMS base

Claims (10)

An inductance-capacitance two-pass oil liquid detection device with high magnetic permeability material comprising an excitation-collection unit (1) and a detection unit connected to said excitation-collection unit (1) by an insulated conductor,
The detection unit is
a capacitance detection unit comprising a capacitance detection channel (2), a left electrode (3) and a right electrode (4) arranged to face each other on both sides of the capacitance detection channel (2);
an inductance detection unit comprising an inductance detection channel (5), a first planar coil (6), a second planar coil (7), a first high permeability alloy (8) and a second high permeability alloy (9); including
The first planar coil (6) includes a first bonding surface and a first non-bonding surface, the second planar coil (7) includes a second bonding surface and a second non-bonding surface, and includes a first bonding surface. The first non-laminated surface is closely adhered to the first high permeability alloy (8) and the second non-laminated surface is tightly adhered to the second high permeability alloy (8). Affixed to a magnetic permeability alloy (9), a first high permeability alloy (8) is provided with a first dovetail groove, a second high permeability alloy (9) is provided with a second dovetail groove, and an inductance detection channel. (5) penetrates the first planar coil (6), the second planar coil (7), the first dovetail groove and the second dovetail groove,
The left electrode (3) and right electrode (4) of the capacitance detection unit are respectively connected to the positive and negative electrodes of the excitation and collection unit by insulated wires, and the first planar coil (6) and the second planar coil of the inductance detection unit. High magnetic permeability, characterized in that the lead wires at both ends of the coil (7) are respectively connected to the positive and negative poles of the excitation and collection unit (1) by insulated wires, forming a detection excitation and data collection circuit. Material based inductance/capacitance two-pass fluid detection device. 2. The inductance/capacitance two-path oil-liquid detection by high magnetic permeability material according to claim 1, characterized in that the minimum slit portions of the first dovetail groove and the second dovetail groove are all in contact with the inductance detection channel (5). Device. One end of the capacitance detection channel (2) is connected to one end of the inductance detection channel (5), the connection port is the passage inlet (10), and the other end of the capacitance detection channel (2) is the inductance The inductance-capacitance two-passage liquid detection device with high magnetic permeability material according to claim 1, characterized in that it is connected to the other end of the detection passage (5), and the connection port is the passage outlet (11). Said capacitance detection unit further comprises an electrode fixing bracket (12) for fixing said left electrode (3) and right electrode (4), said inductance detection unit further comprises a first planar coil (6), a second planar coil (7), a coil fixing bracket (13) for fixing the first high permeability alloy (8) and the second high permeability alloy (9). Inductance/capacitance two-pass fluid detection device using magnetic material. The inductance-capacitance two-pass oil liquid detection device by high magnetic permeability material according to claim 1, further comprising a PDMS base (14) in which said detection unit is fixed. The inductance-capacitance two-passage fluid with high magnetic permeability material according to claim 1, characterized in that the inner diameters of the capacitance detection passage (2) and the inductance detection passage (5) are both 300 micrometers. detection device. The first planar coil (6) and the second planar coil (7) are both wound with enameled wire, each single planar coil is wound in three layers, the coil diameter is 70 micrometers, and the coil inner diameter is 300 micrometers. and the number of turns is 120. The inductance-capacitance two-pass liquid detection by high magnetic permeability material as claimed in claim 1, characterized in that the materials of the left electrode (3) and the right electrode (4) include permalloy, silicon steel plate and magnetic nanoparticles. Device. The inductance and inductance by high magnetic permeability material according to claim 1, characterized in that the first high magnetic permeability alloy (8) and the second high magnetic permeability alloy (9) include permalloy, silicon steel plate, magnetic nanomaterials. Capacitance two-pass oil liquid detection device. High magnetic permeability material according to claim 1, characterized in that said excitation and collection unit (1) is an impedance analyzer, and excites said capacitance detection unit and inductance detection unit with a high frequency alternating current of 2V, 2MHz. Inductance-capacitance two-pass fluid detection device.

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