CN106093146B - A kind of capacitive reactance formula oil liquid detection system and preparation method thereof - Google Patents
A kind of capacitive reactance formula oil liquid detection system and preparation method thereof Download PDFInfo
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- CN106093146B CN106093146B CN201610751621.2A CN201610751621A CN106093146B CN 106093146 B CN106093146 B CN 106093146B CN 201610751621 A CN201610751621 A CN 201610751621A CN 106093146 B CN106093146 B CN 106093146B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/24—Investigating the presence of flaws
Abstract
The present invention relates to mechanical equipment oil liquid detection technical fields, provide a kind of capacitive reactance formula oil liquid detection system comprising detection device, measurement pattern switch unit and excitation-detection unit.Detection device includes a micro-fluidic chip and a sensing unit, wherein micro-fluidic chip is made of the outlet of microchannel entrance, microchannel, substrate, cast material and microchannel；Sensing unit is arranged in the two sides of microchannel by two single layer coil faces.Different connection type switches different measurement patterns between four lead ends of the measurement pattern switch unit by changing two single layer coils.Excitation-detection unit, can also be as inductive-resistive detection device by, with high-frequency ac electric excitation, making it both can be as capacitance detecting device to two single layer coils.The chip realizes the measuring multiple parameters of capacitor, inductance and resistance using the same sensing unit, can distinguish and detect to particulate pollutants a variety of in oil liquid, further can carry out fault diagnosis to machinery equipment.
Description
Technical field
The present invention relates to the particulate pollutant in equipment oil system field of fault detection more particularly to a kind of pair of oil liquid into
The capacitive reactance formula oil liquid detection system and preparation method thereof of row detection.
Background technique
Particulate pollutant in oil liquid is the main reason for leading to hydraulic system fault, is able to detect that particle in oil liquid
The information of pollutant is the reliable scheme that device systems are carried out with fault diagnosis.Currently, being examined for oil/liquid particle pollution object
The method of survey mainly includes optical detection, acoustic method, inductance detection method and capacitance detecting method etc..Wherein optical detection
Method detection accuracy with higher, but cannot distinguish between the attribute of particulate pollutant, and will receive the influence limit of oil liquid light transmittance
System.Acoustic method is to be detected by detection reflected acoustic wave to the particle in oil liquid, and this method is by ambient noise and oil
The influence of liquid temperature change is than more serious.Inductance detection method can in oil liquid ferromagnetic particle and non-ferromagnetic debris carry out area
Sorting survey, and not vulnerable to extraneous factor influence, high stability, but this method can not in oil liquid water droplet and bubble examine
It surveys, and detection accuracy is high without several method above.Capacitance detecting method is different according to the dielectric constant of medium between two-plate, can
The water droplet and bubble in detection oil liquid are distinguished, but metallic particles cannot be distinguished.The above method all can only be to oil liquid
Single parameter measurement is carried out, and the particle of one or both of oil liquid attribute can only be detected, it cannot be to a variety of
Grain carries out comprehensive detection.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention, which provides, a kind of has measuring multiple parameters and can be to oil
Four class particulate pollutants (water droplet, bubble, ferromagnetic metal particle and non-ferromagnetic metal particle) carry out complex zone sorting in liquid
Capacitive reactance formula oil liquid detection system of survey and preparation method thereof.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of capacitive reactance formula oil liquid detection system, including detection device and excitation-detection unit, in which:
The detection device includes a micro-fluidic chip and a sensing unit, and micro-fluidic chip includes that microchannel enters
Mouth, microchannel and microchannel outlet；
Sensing unit is made of two identical first single layer coils and the second single layer coil, two single layer coil face rows
Two sides of the cloth in microchannel；First single layer coil has first lead end and the second lead end, and second single layer coil has
Third lead end and the 4th lead end；
The capacitive reactance formula oil liquid detection system further includes measurement pattern switch unit, and measurement pattern switch unit passes through change
Different connection type switches different measurement patterns between four lead ends of two single layer coils；
Excitation-detection unit is connect by insulated conductor with measurement pattern switch unit, to give described two single layer coils
With high-frequency ac electric excitation.
Further technical solution is that micro-fluidic chip further includes substrate and cast material, and substrate is placed on microchannel
For fixing micro-fluidic chip and sensing unit, cast material is cast in the micro-fluidic chip and the sensing unit for bottom
It is external.
Further technical solution is, the microchannel is in line type, passes through between two single layer coils, institute
Microchannel is stated to be close to two single layer coils.
Further technical solution is that the microchannel position is on the outside of the inner port edge of two single layer coils.
Further technical solution is that the single layer coil is formed by enameled wire coiling, internal coil diameter 300-1000
Micron, enameled wire line footpath are 50-200 microns, and the number of turns is 20-100 circle, and the microchannel diameter is 100-300 microns.
Further technical solution is that the material of the substrate is glass.
Further technical solution is that the measurement pattern switch unit can make the capacitive reactance formula oil liquid detection system
Switch between capacitance measurement mode and inductive-resistive measurement pattern, the capacitance measurement mode is by first single-layer wire
The first lead end of circle is connected with the second lead end, and the third lead end and the 4th lead end of second single layer coil are connected,
Then the two connectors are connected with power positive cathode respectively again；
The inductive-resistive measurement pattern is by the first lead end of first single layer coil and second single-layer wire
The third lead end of circle is connected, the 4th lead end of the second lead end of first single layer coil and second single layer coil
It is connected, then the two connectors is connected with power positive cathode respectively again.
A kind of production method of capacitive reactance formula oil liquid detection system, in which:
Detection device is made, is first fixed on microchannel mold and two single layer coils in substrate by set position；
Then toward upper cast material in substrate, solidify cast material, then microchannel mold is taken out from the cast material after solidification
Out, microchannel entrance and outlet are formed in microchannel punching two ends with punch；
Four lead ends of described two single layer coils are connect by insulated conductor with measurement pattern switch unit, are measured
Mode switch element is connect by insulated conductor with excitation-detection unit.
Further technical solution is that four lead ends of described two single layer coils are arranged in outside cast material, no
It is poured by cast material.
Further technical solution is that the cast material is dimethyl silicone polymer or poly-methyl methacrylate
Ester.
(3) beneficial effect
The beneficial effects of the present invention are: oil liquid detection system of the invention, by changing sensing unit in detection device
Different connection type switches different measurement patterns between four lead ends of two face single layer coils, makes it in capacitor
It can be realized the detection to 100 microns of water droplet and 150 microns of bubble under measurement pattern, under inductive-resistive measurement pattern
It can be realized the detection to 100 microns of iron particle and 180 microns of copper particle, thus to the water droplet, bubble, ferromagnetic in oil liquid
Property metallic particles and four class particulate pollutant of non-ferromagnetic metal particle distinguish detection.
Detailed description of the invention
Fig. 1 is structure diagram of detection device；
Fig. 2 is sensing unit front view；
Fig. 3 is sensing unit side view；
Fig. 4 is the capacitance measurement mode schematic diagram of one embodiment of the invention；
Fig. 5 is the inductive-resistive measurement pattern schematic diagram of another embodiment of the present invention；
Fig. 6 is the system diagram of detection device and its measuring unit.
[description of symbols]
1: feeder connection；
2: microchannel；
3: substrate；
4: cast material；
5: sensing unit；
6: channel outlet；
7: the first single layer coils；
8: insulated conductor；
11: measurement pattern switch unit；
12: excitation-detection unit；
14: the second single layer coils；
15: first lead end；
16: the second lead ends；
17: third lead end；
18: the four lead ends.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Embodiment one:
In conjunction with Fig. 1, Fig. 2 and Fig. 3, referring to Fig. 6, a kind of capacitive reactance formula oil liquid detection system, including detection device, measurement pattern
Switch unit 11 and excitation-detection unit 12.
Detection device include a micro-fluidic chip and a sensing unit 5, micro-fluidic chip include microchannel entrance 1,
Microchannel 2, substrate 3, cast material 4 and microchannel outlet 6.
Sensing unit 5 is made of two identical first single layer coils 7 and the second single layer coil 14, two single layer coils 7,
14 faces are arranged in the two sides of microchannel 2；First single layer coil 7 has first lead end 15 and the second lead end 16, described
Second single layer coil 14 has third lead end 17 and the 4th lead end 18.
Two single layer coils 7,14 are formed by enameled wire coiling, and internal coil diameter is 300-1000 microns, and enameled wire line footpath is
50-200 microns, the number of turns is 20-100 circle.2 diameter of microchannel is 100-300 microns, and microchannel 2 is in line type, from two single layers
It passes through between coil 7,14, is close to two single layer coils 7,14,2 position of microchannel is in the inner hole of two single layer coils 7,14
On the outside of edge.
The connection different between four lead ends by changing two single layer coils 7,14 of measurement pattern switch unit 11
Mode switches different measurement patterns, including capacitance measurement mode and inductive-resistive measurement pattern.Excitation-detection unit 12
Connect by insulated conductor 8 with measurement pattern switch unit 11, with to described two single layer coils 7,14 with high-frequency ac electric shock
It encourages.
It can be carried out and be measured by following mode of operation with Fig. 5, capacitive reactance formula oil liquid detection system of the invention referring to fig. 4
The switching of mode, specific:
The first lead end 15 of first single layer coil 7 is connected with the second lead end 16 by insulated conductor 8, the second single layer
The third lead end 17 of coil 7 is connected with the 4th lead end 18 by insulated conductor 8, is then again passed through the two connectors exhausted
Edge conducting wire 8 is connected with power positive cathode respectively, and mode at this time is capacitance measurement mode.
Under capacitance measurement mode, by excitation-detection unit 12 to two single layer coils 7,14 with high-frequency ac electric excitation,
The capacitance signal that single layer coil 7,14 can be measured, when the water droplet in oil liquid passes through sensing unit 5, due to the opposite dielectric of water
Constant is greater than the relative dielectric constant of oil liquid, will generate positive capacitance signal pulse, when the bubble in oil liquid is single by sensing
When member 5, since the relative dielectric constant of air is less than the relative dielectric constant of oil liquid, the capacitance signal pulse of negative sense will be generated,
To realize that the differentiation to water droplet and bubble in oil liquid detects.
The third lead end 17 of the first lead end 15 of first single layer coil 7 and the second single layer coil 14 is led by insulation
Line 8 is connected, and the second lead end 16 of the first single layer coil 7 and the 4th lead end 18 of the second single layer coil 7 pass through insulated conductor 8
Be connected, then again by the two connectors by insulated conductor 8 respectively with power positive cathode mutually repeatedly, measurement pattern at this time is
Inductive-resistive measurement pattern.
Under inductive-resistive measurement pattern, by excitation-detection unit 12 to two single layer coils 7,14 with high-frequency alternating current
Excitation, since magnetization will generate positive inductance signal pulse, works as non-ferric when ferromagnetic particle passes through sensing unit 5
When magnetic-particle passes through sensing unit, since eddy current effect will generate the resistance signal arteries and veins of the inductance signal pulse and forward direction of negative sense
Punching, to realize that the differentiation to ferromagnetic particle and non-ferromagnetic debris in oil liquid detects.
Under capacitance measurement mode, excitation-detection unit 12 is 1-2V to the high-frequency alternating current of two single layer coils 7,14,
0.1-2MHz。
Under inductive-resistive measurement pattern, excitation-detection unit 12 is 1- to the high-frequency alternating current of two single layer coils 7,14
2V, 0.8-2MHz.
Embodiment two:
Referring to Fig. 1 and Fig. 6, the production method of capacitive reactance formula oil liquid detection system of the invention is always divided into three steps, specific:
The first step makes detection device.Microchannel mold and two single layer coils 7,14 are consolidated by set position first
It is scheduled in substrate 3；Then toward upper cast material 4 in substrate 3, solidify cast material 4；Finally by microchannel mold from solidification
It is extracted out in cast material 4 afterwards, with punch in 2 punching two ends of microchannel, forms microchannel entrance 1 and microchannel outlet 6, arrive
This completes the production of detection device.The material of above-mentioned substrate 3 is glass.Four lead end cloth of two single layer coils 7,14
It sets outside cast material 4, is not poured by cast material 4.Cast material 4 is dimethyl silicone polymer or polymethylacrylic acid
Methyl esters.
The detection device made is connect by insulated conductor with measurement pattern switch unit 11 by second step.
Third step, then connect measurement pattern switch unit 11 with excitation-detection unit 12 by insulated conductor, that is, it completes
The building of capacitive reactance formula oil liquid detection system.
It can be the cured method of cast material 4 in the baking oven for place it in 80 DEG C to toast 1 hour.
In conclusion using measurement pattern switch unit, by two face lists for changing sensing unit in detection device
Different connection type between four lead ends of layer line circle, and give two single layer coils with high frequency by excitation-detection unit
Exchange electric excitation, to switch different measurement patterns, make its can be realized under capacitance measurement mode to 100 microns of water droplet and
The detection of 150 microns of bubble is can be realized under inductive-resistive measurement pattern to 100 microns of iron particle and 180 microns
The detection of copper particle, thus to water droplet, four class particle of bubble, ferromagnetic metal particle and non-ferromagnetic metal particle in oil liquid
Pollutant distinguishes detection.
Claims (9)
1. a kind of capacitive reactance formula oil liquid detection system, including detection device and excitation-detection unit, it is characterised in that:
The detection device includes a micro-fluidic chip and a sensing unit, and micro-fluidic chip includes microchannel entrance, micro-
Channel and microchannel outlet；
Sensing unit is made of two identical first single layer coils and the second single layer coil, and two single layer coil faces are arranged in
The two sides of microchannel；First single layer coil has first lead end and the second lead end, and second single layer coil has third
Lead end and the 4th lead end；
The capacitive reactance formula oil liquid detection system further includes measurement pattern switch unit, and measurement pattern switch unit is by changing two
Different connection type switches different measurement patterns between four lead ends of single layer coil；
Excitation-detection unit is connect by insulated conductor with measurement pattern switch unit, to give described two single layer coils with height
Frequency exchange electric excitation；
The measurement pattern switch unit can make the capacitive reactance formula oil liquid detection system in capacitance measurement mode and inductive-resistive
Switch between measurement pattern, the capacitance measurement mode is by the first lead end of first single layer coil and the second lead end
Be connected, the third lead end and the 4th lead end of second single layer coil are connected, then again by the two connectors respectively with
Power positive cathode is connected；
The inductive-resistive measurement pattern is by the first lead end of first single layer coil and second single layer coil
Third lead end is connected, the 4th lead end phase of the second lead end of first single layer coil and second single layer coil
Even, then the two connectors are connected with power positive cathode respectively again.
2. capacitive reactance formula oil liquid detection system as described in claim 1, it is characterised in that:
Micro-fluidic chip further includes substrate and cast material, substrate be placed on the bottom of microchannel for fix micro-fluidic chip and
Sensing unit, cast material are cast in the outside of the micro-fluidic chip and the sensing unit.
3. capacitive reactance formula oil liquid detection system as described in claim 1, it is characterised in that:
The microchannel is in line type, passes through between two single layer coils, the microchannel and two single-layer wires
Circle is close to.
4. capacitive reactance formula oil liquid detection system as claimed in claim 3, it is characterised in that:
The microchannel position is on the outside of the inner port edge of two single layer coils.
5. capacitive reactance formula oil liquid detection system as described in claim 1, it is characterised in that:
The single layer coil is formed by enameled wire coiling, and internal coil diameter is 300-1000 microns, and enameled wire line footpath is that 50-200 is micro-
Rice, the number of turns are 20-100 circle, and the microchannel diameter is 100-300 microns.
6. capacitive reactance formula oil liquid detection system as claimed in claim 2, it is characterised in that:
The material of the substrate is glass.
7. a kind of production method of capacitive reactance formula oil liquid detection system, it is characterised in that:
Detection device is made, is first fixed on microchannel mold and two single layer coils in substrate by set position；Then
Cast material is gone up on toward substrate, solidifies cast material, then microchannel mold is extracted out from the cast material after solidification, is used
Punch forms microchannel entrance and outlet in microchannel punching two ends；
Four lead ends of described two single layer coils are connect by insulated conductor with measurement pattern switch unit, measurement pattern
Switch unit is connect by insulated conductor with excitation-detection unit；
Wherein, between four lead ends of the measurement pattern switch unit by changing two single layer coils different connection type come
Switch different measurement patterns, including capacitance measurement mode and inductive-resistive measurement pattern；
Capacitance measurement mode is that the first lead end of the first single layer coil is connected with the second lead end by insulated conductor, the
The third lead end and the 4th lead end of two single layer coils are connected by insulated conductor, are then again passed through the two connectors exhausted
Edge conducting wire is connected with power positive cathode respectively；
Inductive-resistive measurement pattern is, by the third lead end at the first lead end of the first single layer coil and the second single layer coil
It is connected by insulated conductor, the second lead end of the first single layer coil and the 4th lead end of the second single layer coil are led by insulation
Line is connected, and then the two connectors are connected with power positive cathode respectively by insulated conductor again.
8. the production method of capacitive reactance formula oil liquid detection system as claimed in claim 7, it is characterised in that:
Four lead ends of described two single layer coils are arranged in outside cast material, are not poured by cast material.
9. the production method of capacitive reactance formula oil liquid detection system as claimed in claim 7, it is characterised in that:
The cast material is dimethyl silicone polymer or polymethyl methacrylate.
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