CN106093146A - 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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- CN106093146A CN106093146A CN201610751621.2A CN201610751621A CN106093146A CN 106093146 A CN106093146 A CN 106093146A CN 201610751621 A CN201610751621 A CN 201610751621A CN 106093146 A CN106093146 A CN 106093146A
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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 plant equipment oil liquid detection technical field, it is provided that a kind of capacitive reactance formula oil liquid detection system, it includes detecting device, measurement pattern switch unit and excitation detector unit.Detection device includes a micro-fluidic chip and a sensing unit, and wherein, micro-fluidic chip is made up of the outlet of microchannel entrance, microchannel, substrate, modeling material and microchannel；Sensing unit by two single layer coils just to the both sides being arranged in microchannel.Measurement pattern switch unit switches different measurement patterns by different connected mode between four lead ends of two single layer coils of change.Excitation detector unit by two single layer coils with high-frequency ac electric excitation so that it is both can be as capacitance detecting device, it is also possible to as inductive resistance detect device.This chip utilizes same sensing unit to achieve the measuring multiple parameters of electric capacity, inductance and resistance, multiple particulate pollutant in fluid can be distinguished detection, further machinery equipment can be carried out fault diagnosis.
Description
Technical field
The present invention relates to equipment oil system field of fault detection, particularly relate to a kind of particulate pollutant in fluid be entered
Capacitive reactance formula oil liquid detection system of row detection and preparation method thereof.
Background technology
Particulate pollutant in fluid is the main reason causing hydraulic system fault, it is possible to granule in fluid detected
The information of pollutant, is the reliable scheme that device systems carries out fault diagnosis.At present, examine for oil/liquid particle pollution thing
The method surveyed mainly includes optical detection, acoustic method, inductance detection method and capacitance detecting method etc..Wherein optical detection
Method has higher accuracy of detection, but cannot distinguish between the attribute of particulate pollutant, and can be affected by fluid transmittance and limit
System.Acoustic method is to be detected the granule in fluid by detection reflection sound wave, and the method is by environment noise and oil
The impact ratio of liquid temp change is more serious.Inductance detection method can carry out district to the ferromagnetic particle in fluid and non-ferromagnetic debris
Go-on-go is surveyed, and is susceptible to extraneous factor impact, and stability is higher, but the water droplet in fluid and bubble cannot be examined by the method
Survey, and accuracy of detection several method the most above is high.Capacitance detecting method is different according to the dielectric constant of medium between two-plate, it is possible to
Distinguish the water droplet in detection fluid and bubble, but metallic particles can not be made a distinction.The above method all can only be to fluid
Carry out single parameter measurement, and the granule of one or both attributes in fluid can only be detected, it is impossible to multiple
Grain carries out comprehensive detection.
Summary of the invention
(1) to solve the technical problem that
In order to solve the problems referred to above of prior art, the present invention provides one to have measuring multiple parameters and can be to oil
In liquid, four class particulate pollutants (water droplet, bubble, ferromagnetic metal granule and non-ferromagnetic metal granule) carry out complex zone go-on-go
Capacitive reactance formula oil liquid detection system surveyed and preparation method thereof.
(2) technical scheme
In order to achieve the above object, the main technical schemes that the present invention uses includes:
A kind of capacitive reactance formula oil liquid detection system, including detection device and excitation-detector unit, wherein:
Described 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 up of two the first identical single layer coils and the second single layer coil, and two single layer coils are just to row
Cloth is in the both sides of microchannel；Described first single layer coil has the first lead end and the second lead end, described second single layer coil to have
3rd lead end and the 4th lead end；
Described capacitive reactance formula oil liquid detection system also includes measurement pattern switch unit, and measurement pattern switch unit is by changing
Between four lead ends of two single layer coils, different connected modes switches different measurement patterns；
Excitation-detector unit is connected with measurement pattern switch unit by insulated conductor, with to said two single layer coil
With high-frequency ac electric excitation.
Further technical scheme is that micro-fluidic chip also includes substrate and modeling material, and substrate is placed on microchannel
Bottom is used for fixing micro-fluidic chip and sensing unit, and modeling material is cast in described micro-fluidic chip and described sensing unit
Outside.
Further technical scheme is, described microchannel is in line type, passes, institute between two described single layer coils
State microchannel to be close to two described single layer coils.
Further technical scheme is, position, described microchannel is in outside the inner port edge of two single layer coils.
Further technical scheme is, described single layer coil is formed by enamel-covered wire coiling, and internal coil diameter is 300-1000
Micron, enamel-covered wire line footpath is 50-200 micron, and the number of turn is 20-100 circle, and described microchannel diameter is 100-300 micron.
Further technical scheme is, the material of described substrate is glass.
Further technical scheme is, described measurement pattern switch unit can make described capacitive reactance formula oil liquid detection system
Switching between capacitance measurement pattern and inductive-resistive measurement pattern, described capacitance measurement pattern is for by described first single-layer wire
First lead end of circle and the second lead end are connected, and the 3rd lead end of described second single layer coil and the 4th lead end are connected,
The most again the two connector is connected with power positive cathode respectively；
Described inductive-resistive measurement pattern is by the first lead end of described first single layer coil and described second single-layer wire
3rd lead end of circle is connected, the second lead end of described first single layer coil and the 4th lead end of described second single layer coil
It is connected, the most again the two connector is connected with power positive cathode respectively.
A kind of manufacture method of capacitive reactance formula oil liquid detection system, wherein:
Make detection device, first microchannel mould and two single layer coils are fixed in substrate by set position；
Then in substrate, go up modeling material, make modeling material solidify, then microchannel mould is taken out from the modeling material after solidification
Go out, with card punch at microchannel punching two ends, form microchannel entrance and outlet；
Four lead ends of said two single layer coil are connected with measurement pattern switch unit by insulated conductor, measure
Mode switch element is connected with excitation-detector unit by insulated conductor.
Further technical scheme is that four lead ends of said two single layer coil are arranged in outside modeling material, no
Poured into a mould by modeling material.
Further technical scheme is, described modeling material is polydimethylsiloxane or poly-methyl methacrylate
Ester.
(3) beneficial effect
The invention has the beneficial effects as follows: the oil liquid detection system of the present invention, by changing sensing unit in detection device
Two just switch different measurement patterns to different connected mode between four lead ends of single layer coil so that it is at electric capacity
The detection of the bubble of the water droplet to 100 microns and 150 microns it is capable of, under inductive-resistive measurement pattern under measurement pattern
It is capable of the detection of the copper granule of the ferrum granule to 100 microns and 180 microns, thus to the water droplet in fluid, bubble, ferromagnetic
Property metallic particles and non-ferromagnetic metal granule four class particulate pollutant make a distinction detection.
Accompanying drawing explanation
Fig. 1 is structure of the detecting device figure；
Fig. 2 is sensing unit front view；
Fig. 3 is sensing unit side view；
Fig. 4 is the capacitance measurement pattern 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 detection device and the system diagram of measuring unit thereof.
[description of reference numerals]
1: feeder connection；
2: microchannel；
3: substrate；
4: modeling material；
5: sensing unit；
6: channel outlet；
7: the first single layer coils；
8: insulated conductor；
11: measurement pattern switch unit；
12: excitation-detector unit；
14: the second single layer coils；
15: the first lead ends；
16: the second lead ends；
17: the three lead ends；
18: the four lead ends.
Detailed description of the invention
In order to preferably explain the present invention, in order to understand, below in conjunction with the accompanying drawings, by detailed description of the invention, to this
Bright it is described in detail.
Embodiment one:
In conjunction with Fig. 1, Fig. 2 and Fig. 3, seeing Fig. 6, a kind of capacitive reactance formula oil liquid detection system, including detection device, measurement pattern
Switch unit 11 and excitation-detector 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, modeling material 4 and microchannel outlet 6.
Sensing unit 5 is made up of two the first identical single layer coils 7 and the second single layer coil 14, two single layer coils 7,
14 just to the both sides being arranged in microchannel 2；Described first single layer coil 7 has the first lead end 15 and the second lead end 16, described
Second single layer coil 14 has the 3rd lead end 17 and the 4th lead end 18.
Two single layer coils 7,14 are formed by enamel-covered wire coiling, and internal coil diameter is 300-1000 micron, and enamel-covered wire line footpath is
50-200 micron, the number of turn is 20-100 circle.Microchannel 2 a diameter of 100-300 micron, microchannel 2 is in line type, from two monolayers
Passing between coil 7,14, be close to two single layer coils 7,14, position, microchannel 2 is in the endoporus of two single layer coils 7,14
Outside edge.
Measurement pattern switch unit 11 is by changing connections different between four lead ends of two single layer coils 7,14
Mode switches different measurement patterns, including capacitance measurement pattern and inductive-resistive measurement pattern.Excitation-detector unit 12
Be connected with measurement pattern switch unit 11 by insulated conductor 8, with to said two single layer coil 7,14 with high-frequency ac electric shock
Encourage.
See Fig. 4 and Fig. 5, the capacitive reactance formula oil liquid detection system of the present invention, can be carried out by following mode of operation and measure
The switching of pattern, concrete:
First lead end 15 of the first single layer coil 7 is connected by insulated conductor 8 with the second lead end 16, the second monolayer
3rd lead end 17 of coil 7 is connected by insulated conductor 8 with the 4th lead end 18, the most again by the two connector by absolutely
Edge wire 8 is connected with power positive cathode respectively, and pattern now is capacitance measurement pattern.
Under capacitance measurement pattern, by excitation-detector unit 12 to two single layer coils 7,14 with high-frequency ac electric excitation,
The capacitance signal of single layer coil 7,14 can be measured, when the water droplet in fluid is through sensing unit 5, due to the relative dielectric of water
Constant, more than the relative dielectric constant of fluid, will produce the capacitance signal pulse of forward, when the bubble in fluid is single through sensing
During unit 5, owing to the relative dielectric constant of air is less than the relative dielectric constant of fluid, the capacitance signal pulse of negative sense will be produced,
Thus realize the differentiation to the water droplet in fluid and bubble and detect.
First lead end 15 of the first single layer coil 7 and the 3rd lead end 17 of the second single layer coil 14 are 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 are by insulated conductor 8
Being connected, the most again by the two connector by insulated conductor 8 respectively with power positive cathode the most repeatedly, measurement pattern now is
Inductive-resistive measurement pattern.
Under inductive-resistive measurement pattern, give two single layer coils 7,14 with high-frequency alternating current by excitation-detector unit 12
Excitation, when ferromagnetic particle is through sensing unit 5, owing to magnetization is by producing the inductance signal pulse of forward, works as non-ferric
Magnetic-particle is through sensing unit, owing to eddy current effect will produce inductance signal pulse and the resistance signal arteries and veins of forward of negative sense
Punching, thus realize the differentiation to the ferromagnetic particle in fluid and non-ferromagnetic debris and detect.
Under capacitance measurement pattern, excitation-detector 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-detector unit 12 is 1-to the high-frequency alternating current of two single layer coils 7,14
2V, 0.8-2MHz.
Embodiment two:
Seeing Fig. 1 and Fig. 6, the manufacture method of the capacitive reactance formula oil liquid detection system of the present invention is always divided into three steps, concrete:
The first step, makes detection device.First by solid by set position to microchannel mould and two single layer coils 7,14
It is scheduled in substrate 3；Then in substrate 3, go up modeling material 4, make modeling material 4 solidify；Finally by microchannel mould from solidification
After modeling material 4 in extract out, with card punch at microchannel 2 punching two ends, form microchannel entrance 1 and microchannel outlet 6, arrive
This i.e. completes the making of detection device.The material of above-mentioned substrate 3 is glass.Four lead end cloth of two single layer coils 7,14
Put outside modeling material 4, do not poured into a mould by modeling material 4.Modeling material 4 is polydimethylsiloxane or polymethylacrylic acid
Methyl ester.
Second step, is connected the detection device made with measurement pattern switch unit 11 by insulated conductor.
3rd step, then by insulated conductor, measurement pattern switch unit 11 is connected with excitation-detector unit 12, i.e. complete
The building of capacitive reactance formula oil liquid detection system.
The method making modeling material 4 solidify can be to place it in the baking oven of 80 DEG C to toast 1 hour.
In sum, utilize measurement pattern switch unit, by change detection device two of sensing unit just to list
Connected modes different between four lead ends of layer line circle, and give two single layer coils with high frequency by excitation-detector unit
Alternating current encourage, switch different measurement patterns so that it is be capable of under capacitance measurement pattern the water droplet to 100 microns and
The detection of the bubble of 150 microns, is capable of the ferrum granule to 100 microns and 180 microns under inductive-resistive measurement pattern
The detection of copper granule, thus to the water droplet in fluid, bubble, ferromagnetic metal granule and non-ferromagnetic metal granule four class granule
Pollutant make a distinction detection.
Claims (10)
1. a capacitive reactance formula oil liquid detection system, including detection device and excitation-detector unit, it is characterised in that:
Described detection device includes a micro-fluidic chip and a sensing unit, and micro-fluidic chip includes microchannel entrance, micro-
Passage and microchannel outlet；
Sensing unit is made up of two the first identical single layer coils and the second single layer coil, and two single layer coils are just to being arranged in
The both sides of microchannel；Described first single layer coil has the first lead end and the second lead end, described second single layer coil to have the 3rd
Lead end and the 4th lead end；
Described capacitive reactance formula oil liquid detection system also includes measurement pattern switch unit, and measurement pattern switch unit is by changing two
Between four lead ends of single layer coil, different connected modes switches different measurement patterns；
Excitation-detector unit is connected with measurement pattern switch unit by insulated conductor, with to said two single layer coil with height
Frequently alternating current excitation.
2. capacitive reactance formula oil liquid detection system as claimed in claim 1, it is characterised in that:
Micro-fluidic chip also includes substrate and modeling material, substrate be placed on the bottom of microchannel for fix micro-fluidic chip and
Sensing unit, modeling material is cast in described micro-fluidic chip and the outside of described sensing unit.
3. capacitive reactance formula oil liquid detection system as claimed in claim 1, it is characterised in that:
Described microchannel is in line type, passes between two described single layer coils, described microchannel and two described single-layer wire
Circle is close to.
4. capacitive reactance formula oil liquid detection system as claimed in claim 3, it is characterised in that:
Position, described microchannel is in outside the inner port edge of two single layer coils.
5. capacitive reactance formula oil liquid detection system as claimed in claim 1, it is characterised in that:
Described single layer coil is formed by enamel-covered wire coiling, and internal coil diameter is 300-1000 micron, and enamel-covered wire line footpath is that 50-200 is micro-
Rice, the number of turn is 20-100 circle, and described microchannel diameter is 100-300 micron.
6. capacitive reactance formula oil liquid detection system as claimed in claim 2, it is characterised in that:
The material of described substrate is glass.
7. capacitive reactance formula oil liquid detection system as claimed in claim 1, it is characterised in that:
Described measurement pattern switch unit can make described capacitive reactance formula oil liquid detection system at capacitance measurement pattern and inductive-resistive
Switching between measurement pattern, described capacitance measurement pattern is by the first lead end of described first single layer coil and the second lead end
Being connected, the 3rd lead end of described second single layer coil and the 4th lead end are connected, the most again by the two connector respectively with
Power positive cathode is connected；
Described inductive-resistive measurement pattern is by the first lead end of described first single layer coil and described second single layer coil
3rd lead end is connected, the second lead end of described first single layer coil and the 4th lead end phase of described second single layer coil
Even, the most again the two connector is connected with power positive cathode respectively.
8. the manufacture method of a capacitive reactance formula oil liquid detection system, it is characterised in that:
Make detection device, first microchannel mould and two single layer coils are fixed in substrate by set position；Then
In substrate, go up modeling material, make modeling material solidify, then microchannel mould is extracted out from the modeling material after solidification, use
Card punch, at microchannel punching two ends, forms microchannel entrance and outlet；
Four lead ends of said two single layer coil are connected with measurement pattern switch unit by insulated conductor, measurement pattern
Switch unit is connected with excitation-detector unit by insulated conductor.
9. the manufacture method of capacitive reactance formula oil liquid detection system as claimed in claim 8, it is characterised in that:
Four lead ends of said two single layer coil are arranged in outside modeling material, are not poured into a mould by modeling material.
10. the manufacture method of capacitive reactance formula oil liquid detection system as claimed in claim 8, it is characterised in that:
Described modeling material is polydimethylsiloxane or polymethyl methacrylate.
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| CN115629110B (en) * | 2022-12-21 | 2023-03-28 | 中国石油大学(华东) | Inductance-capacitance double-end nondestructive testing device under single-ended signal excitation |
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